Vehicle hydraulic system and garbage truck

Abstract

The utility model provides a vehicle hydraulic system and a garbage truck. The vehicle hydraulic system comprises an oil tank; an oil pump; a single-action oil cylinder; the first end of the confluence oil way is communicated with the connector of the single-action oil cylinder, and a first valve is arranged on the confluence oil way; the first multi-way valve is communicated with the second end of the converging oil way, and the first multi-way valve is used for controlling the second end of the converging oil way to be communicated with the output end of the oil pump or the input end of the oil tank; the input end of the independent oil way is arranged between the first end of the converging oil way and the first valve, the output end of the independent oil way is communicated with the input end of the oil tank, a second valve is arranged on the independent oil way, and the independent oil way is used for conveying hydraulic oil in the single-action oil cylinder into the oil tank. According to the single-action oil cylinder, three-stage control over the shrinkage speed of the single-action oil cylinder is achieved, and a user can use the single-action oil cylinder at different shrinkage speeds according to different conditions.

Description

Technical Field

[0001] The present application relates to the field of hydraulic systems, and in particular to a vehicle hydraulic system and a garbage truck. Background Art

[0002] Nowadays, trucks, such as garbage trucks, sand trucks, etc., are equipped with hydraulic systems to facilitate transportation and unloading. The cylinders in the hydraulic system can automatically lift the carriage or other components to speed up the efficiency of cargo loading and unloading.

[0003] There are many cylinders in the hydraulic system. Based on the different positions of the cylinders and the different loads, some cylinders require a slower contraction speed, while some cylinders require a faster contraction speed to coordinate the various components in the running vehicle, improve work efficiency, and avoid safety accidents.

[0004] However, many hydraulic systems are currently configured as complete hydraulic systems to control multiple cylinders in parallel. Because these systems are complete, the diameters of the oil supply and return lines for each cylinder are identical, which can meet the requirements of standard cylinder lifting and lowering. However, when the hydraulic system needs to control a cylinder that requires a faster retraction speed, the same oil circuit configuration will not meet the user's needs. Utility Model Content

[0005] To solve the above technical problems, an embodiment of the present application provides a vehicle hydraulic system.

[0006] The embodiments of the present application are intended to provide a hydraulic system that increases the upper limit of the cylinder retraction speed.

[0007] The embodiments of the present application are intended to provide a hydraulic system that can control the retraction speed of the cylinder to a greater extent.

[0008] According to one embodiment of the present application, the present application provides a vehicle hydraulic system, the vehicle hydraulic system comprising:

[0009] Oil tank, used to store hydraulic oil;

[0010] An oil pump, used to extract the hydraulic oil in the oil tank and transport it;

[0011] Single-acting cylinder, used to expand and contract according to the pressure generated by the hydraulic oil in the single-acting cylinder to push the load;

[0012] A merging oil circuit, a first end of which is in communication with an interface of the single-acting oil cylinder, and a first valve is provided on the merging oil circuit;

[0013] a first multi-way valve, the first multi-way valve being in communication with the second end of the merging oil circuit, and the first multi-way valve being used to control the second end of the merging oil circuit to be in communication with the output end of the oil pump or the input end of the oil tank;

[0014] An independent oil circuit, the input end of the independent oil circuit is arranged between the first end of the merged oil circuit and the first valve, the output end of the independent oil circuit is connected to the input end of the oil tank, a second valve is provided on the independent oil circuit, and the independent oil circuit is used to transport the hydraulic oil in the single-acting cylinder to the oil tank.

[0015] According to one embodiment of the present application, a third valve is further provided in the vehicle hydraulic system, and two ends of the third valve are respectively connected to two sides of the second valve.

[0016] According to one embodiment of the present application, the first interface of the first multi-way valve is communicated with the second end of the merged oil circuit, the second interface of the first multi-way valve is communicated with the output end of the oil pump, and the third interface of the first multi-way valve is communicated with the input end of the oil tank;

[0017] When the first port of the first multi-way valve is connected only to the second port of the first multi-way valve, the second end of the combined oil circuit is connected to the output end of the oil pump via the first multi-way valve, and the hydraulic oil in the oil tank can be delivered to the single-acting cylinder;

[0018] When the first interface of the first multi-way valve is only connected to the third interface of the first multi-way valve, the second end of the merged oil circuit is connected to the input end of the oil tank via the first multi-way valve, and the hydraulic oil in the single-acting cylinder can be delivered to the oil tank.

[0019] According to one embodiment of the present application, a double-acting cylinder is provided in the vehicle hydraulic system. The double-acting cylinder is provided with a first interface and a second interface. A piston in the double-acting cylinder moves between the first interface and the second interface of the double-acting cylinder to drive a piston rod connected to the piston to move.

[0020] The vehicle hydraulic system is further provided with a second multi-way valve, wherein a first interface of the second multi-way valve is communicated with a first interface of the double-acting cylinder, a second interface of the second multi-way valve is communicated with a second interface of the double-acting cylinder, a third interface of the second multi-way valve is communicated with an output end of the oil pump, and a fourth interface of the second multi-way valve is communicated with an input end of the oil tank;

[0021] The first interface of the second multi-way valve is connected to the third interface of the second multi-way valve, and the second interface of the second multi-way valve is connected to the fourth interface of the second multi-way valve, so that the first interface of the double-acting cylinder is connected to the output end of the oil pump and the second interface of the double-acting cylinder is connected to the input end of the oil tank. The piston in the double-acting cylinder moves toward the second interface of the double-acting cylinder, and the piston rod extends.

[0022] The first interface of the second multi-way valve is connected with the fourth interface of the second multi-way valve, and the second interface of the second multi-way valve is connected with the third interface of the second multi-way valve, so that the first interface of the double-acting cylinder is connected to the input end of the oil tank, and the second interface of the double-acting cylinder is connected to the output end of the oil pump. The piston in the double-acting cylinder moves toward the first interface of the double-acting cylinder, and the piston rod retracts.

[0023] According to one embodiment of the present application, the oil pump is a load-sensitive oil pump, the first multi-way valve and the second multi-way valve are load-sensitive proportional valves, the load-sensitive oil pump and the load-sensitive proportional valve are signal-connected, and the load-sensitive proportional valve controls the speed of the oil pump according to the acquired load oil pressure to control the pressure difference between the load oil pressure and the output oil pressure of the load-sensitive oil pump, and the load oil pressure includes the oil pressure in the single-acting cylinder and the oil pressure in the double-acting cylinder.

[0024] According to one embodiment of the present application, the third valve is a manual valve.

[0025] According to one embodiment of the present application, at least one independent oil circuit is provided in the vehicle hydraulic system.

[0026] According to one embodiment of the present application, a filter is provided in the vehicle hydraulic system, and the output end of the filter is connected to the input end of the oil tank for filtering the hydraulic oil that is about to enter the oil tank.

[0027] According to one embodiment of the present application, the present application provides a garbage truck, which is equipped with a vehicle hydraulic system as described in any one of the above items; as well as a vehicle body and a vehicle head, the vehicle body includes a vehicle box and a frame, and the single-acting cylinder is arranged between the vehicle box and the frame, and is used to push the vehicle box to flip the vehicle box relative to the frame.

[0028] According to one embodiment of the present application, the vehicle hydraulic system includes one or more double-acting cylinders, which are used as one or more of the following cylinders:

[0029] A compression cylinder is provided in the garbage truck and is used to compress the garbage in the truck box;

[0030] A tailgate cylinder is provided in the garbage truck and is used to push the tailgate provided on one side of the vehicle body to control the opening and closing of the tailgate;

[0031] A top cover oil cylinder is provided in the garbage truck and is used to push the top cover provided at the loading port of the vehicle box to control the opening and closing of the loading port.

[0032] By simultaneously providing two oil circuits, the present application allows the hydraulic oil in the single-acting cylinder to flow back to the oil tank via the two oil circuits, thereby significantly increasing the upper limit of the retraction speed of the single-acting cylinder. Furthermore, the speed at which the hydraulic oil in the single-acting cylinder flows back to the oil tank can be adjusted to a greater extent by adjusting the opening state of the first valve and the second valve, thereby increasing the adjustability of the retraction speed of the single-acting cylinder. Finally, by adjusting the first and second valves in three different opening and closing modes, the retraction speed of the single-acting cylinder is controlled in three levels, which facilitates the user to operate the single-acting cylinder at different retraction speeds according to different situations.

[0033] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0034] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other objects, features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0036] Figure 1 A schematic diagram of a vehicle hydraulic system according to an embodiment of the present application is shown.

[0037] Figure 2 The figure shows a schematic diagram of a hydraulic system according to an embodiment of the present application.

[0038] Figure 3 A schematic diagram of a third valve according to an embodiment of the present application is shown.

[0039] Figure 4 A schematic diagram of oil inlet and oil return of a single-acting cylinder according to an embodiment of the present application is shown.

[0040] Figure 5 A schematic diagram of a hydraulic system according to an embodiment of the present application is shown.

[0041] Figure 6 Shown Figure 5 The connection relationship between the first valve and the second valve.

[0042] Figure 7A schematic diagram of the distribution of double-acting cylinders in a hydraulic system according to an embodiment of the present application is shown.

[0043] Figure 8 A schematic diagram showing a bidirectional balancing valve provided between a double-acting cylinder and a second multi-way valve according to an embodiment of the present application is shown.

[0044] Figure 9 A schematic diagram of a vehicle hydraulic system provided with a filter according to an embodiment of the present application is shown.

[0045] Figure 10 A schematic diagram of a vehicle hydraulic system provided with a radiator according to an embodiment of the present application is shown.

[0046] Figure 11 A structural schematic diagram of a garbage truck according to an embodiment of the present application is shown.

[0047] Figure 12 A schematic structural diagram of a garbage truck according to another embodiment of the present application is shown.

[0048] Figure 13 A partial structural schematic diagram of a box body, a top cover, and a top cover opening and closing assembly according to an embodiment of the present application is shown.

[0049] Figure 14 A partial structural schematic diagram of a box body, a tailgate, and a tailgate opening and closing assembly according to an embodiment of the present application is shown.

[0050] Figure 15 A partial structural schematic diagram of a box body and a garbage compression assembly according to an embodiment of the present application is shown.

[0051] Description of reference numerals:

[0052] 110, vehicle body; 111, vehicle frame; 112, vehicle box; 1121, box body; 11211, loading port; 11212, discharge port; 11213, compression chamber; 11214, storage chamber; 1122, top cover; 1223, tailgate; 120, vehicle front; 210, fuel tank; 220, fuel pump; 231, single-acting cylinder; 232, double-acting cylinder; 2321, compression cylinder; 2322, tailgate cylinder; 2323, top cover cylinder; 241, first valve; 2411, first valve switch; 2422, first end of first valve; 2423, second end of first valve; 242, second valve; 2421, second valve switch; 2422, first end of second valve; 2423, second The second end of the valve; 251, the first multi-way valve; 243, the third valve; 252, the second multi-way valve; 260, the filter; 270, the radiator; 280, the two-way balancing valve; 290, the three-way valve; 291, the first interface of the three-way valve; 292, the second interface of the three-way valve; 293, the third interface of the three-way valve; 310, the top cover opening and closing assembly; 311, the top cover support; 312, the bending part; 313, the top cover cylinder support; 320, the tailgate opening and closing assembly; 321, the locking rod; 322, the locking slider; 3221, the locking chute; 324 (323), the support pin; 331, the single-acting cylinder support; 332, the subframe; 340, the garbage compression assembly; 341, the compression head; 342, the guide plate. DETAILED DESCRIPTION

[0053] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this application will be more comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The accompanying drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. Identical reference numerals in the figures indicate identical or similar parts, and thus repeated descriptions thereof will be omitted.

[0054] In addition, the described features, structures or characteristics can be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present application. However, those skilled in the art will appreciate that the technical solutions of the present application can be practiced while omitting one or more of the specific details, or other methods, components, steps, etc. can be adopted. In other cases, known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring the main content and making various aspects of the present application vague.

[0055] The flowcharts shown in the accompanying drawings are only illustrative and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation. It should also be noted that the "multiple" mentioned in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0056] The terms "first," "second," "third," and "fourth," etc. in the specification, claims, and drawings of this application are used to distinguish different objects rather than to describe a specific order. The terms "include," "include," and "have," and any variations thereof, are intended to cover non-exclusive inclusions.

[0057] See also Figure 1 , Figure 1 A schematic diagram of a vehicle hydraulic system according to one embodiment of the present application is shown. The vehicle hydraulic system includes a fuel tank 210, an oil pump 220, a single-acting cylinder 231, a combined oil circuit, a first multi-way valve 251, and independent oil circuits. The combined oil circuit is provided with a first valve 241, and the independent oil circuits are provided with a second valve 242.

[0058] The oil tank 210 is used to store hydraulic oil.

[0059] The oil pump 220 is used to pump the hydraulic oil in the oil tank 210 to the single-acting cylinder 231 .

[0060] The telescopic length of single-acting cylinder 231 is determined by the amount of hydraulic oil in the cylinder. The more hydraulic oil in the cylinder, the longer the single-acting cylinder 231 becomes, until it can no longer be extended. The less hydraulic oil in the cylinder, the shorter the single-acting cylinder 231 becomes, until it can no longer be retracted. It is further important to clarify that single-acting cylinder 231 has only one port on its cylinder body, which is used both to supply hydraulic oil to and from the interior of single-acting cylinder 231.

[0061] As Figure 2 As shown, Figure 2The schematic diagram of a hydraulic system according to one embodiment of the present application is shown. The input of the oil pump 220 is connected to the output of the oil tank 210. The output of the oil pump 220 is connected to the second end of the combined oil circuit via a first multi-way valve 251. The oil circuit between the first multi-way valve 251 and the single-acting cylinder 231 forms the combined oil circuit. The input of the oil tank 210 is connected to the second end of the combined oil circuit via the first multi-way valve 251. The first end of the combined oil circuit is connected to the port of the single-acting cylinder 231.

[0062] In the embodiment of the present application, the first multi-way valve 251 can only connect the second end of the merging oil circuit to the input end of the oil tank 210, or only connect the second end of the merging oil circuit to the output end of the oil pump 220. In other words, when the first multi-way valve 251 is in different working states, the second end of the merging oil circuit is connected to different objects.

[0063] When the second end of the combined oil circuit is connected to the output end of the oil pump 220 via the first multi-way valve 251, and the first valve 241 on the combined oil circuit is opened, the oil pump 220 is started, and the hydraulic oil passes through the oil pump 220, the first multi-way valve 251, and the combined oil circuit in sequence and enters the single-acting cylinder 231, thereby achieving the extension of the single-acting cylinder 231.

[0064] When the second end of the merging oil circuit is connected to the input end of the oil tank 210 via the first multi-way valve 251, and the first valve 241 on the merging oil circuit is opened, the hydraulic oil in the single-acting cylinder 231 flows back to the oil tank 210 through the merging oil circuit and the first multi-way valve 251 in sequence, thereby realizing the contraction of the single-acting cylinder 231.

[0065] Therefore, the combined oil circuit can realize oil inflow or oil outflow to the single-acting cylinder 231 through the first multi-way valve 251 .

[0066] In some embodiments, the first port of the first multi-way valve 251 is connected to the second end of the merging oil circuit, the second port of the first multi-way valve 251 is connected to the output end of the oil pump 220, and the third port of the first multi-way valve 251 is connected to the input end of the oil tank 210;

[0067] When the first port of the first multi-way valve 251 is connected only to the second port of the first multi-way valve 251 , the second end of the combined oil circuit is connected to the output end of the oil pump 220 via the first multi-way valve 251 , and the hydraulic oil can be delivered to the single-acting cylinder 231 .

[0068] When the first interface of the first multi-way valve 251 is only connected to the third interface of the first multi-way valve 251, the second end of the merged oil circuit is connected to the input end of the oil tank 210 via the first multi-way valve 251, and the hydraulic oil in the single-acting cylinder 231 is input into the oil tank 210.

[0069] In some embodiments, the first valve 241 is a solenoid steering valve for limiting the flow direction of hydraulic oil. The solenoid steering valve can only pass liquid in one direction.

[0070] For example, when the single-acting cylinder 231 is receiving oil, the solenoid steering valve is de-energized, and hydraulic oil can only flow through the solenoid steering valve to the single-acting cylinder 231. In other words, hydraulic oil can only flow from the second end of the combined oil circuit to the first end of the combined oil circuit. When the single-acting cylinder 231 is discharging oil, the solenoid steering valve is energized, and hydraulic oil can only flow through the solenoid steering valve to the first multi-way valve 251. In other words, hydraulic oil can only flow from the first end of the combined oil circuit to the second end of the combined oil circuit.

[0071] In some embodiments, the vehicle hydraulic system further includes an independent oil circuit. This independent oil circuit is used solely to transport hydraulic oil from the single-acting cylinder 231 to the oil tank 210. The input of the independent oil circuit is located between the first end of the combined oil circuit and the first valve 241. The output of the independent oil circuit is connected to the input of the oil tank 210. A second valve 242 is provided on the independent oil circuit.

[0072] That is, as long as the second valve 242 is opened, the hydraulic oil in the single-acting cylinder 231 will enter the oil tank 210 through the first end of the merging oil circuit and the second valve 242, thereby achieving the contraction of the single-acting cylinder 231.

[0073] In some embodiments, multiple independent oil circuits are provided to further optimize the retraction speed of the single-acting cylinder 231 or to further refine the control of the retraction speed of the cylinder.

[0074] If multiple independent oil circuits are provided, the contraction speed of the single-acting oil cylinder 231 can be controlled by opening different numbers of independent oil circuits, so that the single-acting oil cylinder 231 contracts at different speeds.

[0075] In some embodiments, the second valve 242 is also a solenoid-operated steering valve. Specifically, when the independent oil circuit is not needed to transport the hydraulic oil in the single-acting cylinder 231 to the oil tank 210, the second valve 242 is adjusted to allow the fluid to flow only toward the input end of the independent oil circuit. When the independent oil circuit is needed to transport the hydraulic oil in the single-acting cylinder 231 to the oil tank 210, the second valve 242 is adjusted to allow the fluid to flow only toward the output end of the independent oil circuit, allowing the hydraulic oil in the single-acting cylinder 231 to flow into the oil tank 210.

[0076] For example, when the electromagnetic steering valve serving as the second valve 242 is de-energized, fluid can flow only toward the input end of the independent oil circuit, thereby preventing the hydraulic oil in the single-acting cylinder 231 from flowing out. When the electromagnetic steering valve serving as the second valve 242 is energized, fluid can flow only toward the output end of the independent oil circuit. At this time, the hydraulic oil in the single-acting cylinder 231 flows through the independent oil circuit into the oil tank 210, thereby causing the single-acting cylinder 231 to retract.

[0077] In some embodiments, when the first valve 241 is opened, the second valve 242 is closed, and the second end of the merged oil circuit is connected to the input end of the oil tank 210 via the first multi-way valve 251, the hydraulic oil in the single-acting cylinder flows to the oil tank 210 via the first multi-way valve 251, thereby realizing slow contraction of the single-acting cylinder 231.

[0078] In some embodiments, the diameter of the independent oil circuit is larger than that of the combined oil circuit and other oil circuits. When the first valve 241 is closed and the second valve 242 is opened, the hydraulic oil in the single-acting cylinder flows through the independent oil circuit to the oil tank 210, thereby achieving medium-speed contraction of the single-acting cylinder 231.

[0079] In some embodiments, when the first valve 241 is opened and the second valve 242 is opened, the second end of the combined oil circuit is connected to the input end of the oil tank 210 via the first multi-way valve 251, and the hydraulic oil in the single-acting cylinder flows to the oil tank 210 via the first multi-way valve 251 and the independent oil circuit respectively, thereby realizing the rapid retraction of the single-acting cylinder 231.

[0080] Through the description of the above embodiments, it can be seen that Figure 2 The described vehicle hydraulic system realizes a three-stage speed change of the return oil of the single-acting cylinder 231 by setting up two oil circuits for oil return, thereby realizing a three-stage change of the contraction speed of the single-acting cylinder 231, giving users more choices and enabling the single-acting cylinder 231 to extend and retract at different speeds when dealing with different situations.

[0081] See also Figure 2 and Figure 3 , Figure 3 FIG. 2 shows a schematic diagram of a third valve 243 according to an embodiment of the present application.

[0082] In some embodiments, the hydraulic system further includes a third valve 243, with both ends of the third valve 243 connected to either side of the second valve 242. That is, when the second valve 242 is closed, opening the third valve 243 can also allow the hydraulic oil in the single-acting cylinder 231 to flow back into the oil tank 210. This is to prevent the single-acting cylinder 231 from being unable to retract or the hydraulic oil in the single-acting cylinder 231 from being unable to flow back into the oil tank 210 if the first valve 241 or the second valve 242 malfunctions. By controlling the opening and closing of the third valve 243, the hydraulic oil in the single-acting cylinder 231 can be allowed to flow back into the oil tank 210.

[0083] In some embodiments, the third valve 243 is a solenoid-operated steering valve and is electrically connected to a separate power source.

[0084] In some embodiments, the third valve 243 is a manual valve, and the user can manually control the opening and closing of the valve.

[0085] See also Figure 4 , Figure 4 Schematic diagram of oil inlet and oil return of a single-acting oil cylinder according to an embodiment of the present application is shown. Figure 4 As described, the single-acting cylinder 231 can return oil through the second valve 242 to retract. The single-acting cylinder 231 can take in oil and return oil through the first valve 241 to extend and retract, respectively.

[0086] Please continue reading Figure 5 , Figure 5 A schematic diagram of a hydraulic system according to an embodiment of the present application is shown.

[0087] As Figure 5 As shown, the single-acting cylinder 231 can be connected to the oil tank 210 via the first valve 241, the first multi-way valve 251 and the radiator 280 for oil return. On the other hand, the single-acting cylinder can be directly connected to the oil tank 210 via the second valve 242.

[0088] See also Figure 5 and Figure 6 , Figure 6 Shown Figure 5 The connection relationship between the first valve and the second valve. Figure 6 As shown, the second valve 242 is provided with a second valve switch 2421, a first end 2422 of the second valve, and a second end 2423 of the second valve. The first valve 241 is provided with a first valve switch 2411, a first end 2412 of the first valve, and a second end 2413 of the first valve.

[0089] A three-way valve 290 is installed at the first end 2422 of the second valve. The first and second ports 291 and 292 of the three-way valve respectively connect the single-acting cylinder and the first end 2422 of the second valve. The third port 293 of the three-way valve connects to the first end 2412 of the first valve. Hydraulic oil in the single-acting cylinder 231 can flow directly through the third port 293 of the three-way valve to the first end 2422 of the second valve. It can also flow directly through the third port 293 of the three-way valve to the first end 2412 of the first valve, and then through the second end 2413 of the second valve to the first multi-way valve 251.

[0090] See also Figure 2 and Figure 7 , Figure 7 A schematic diagram of the distribution of double-acting cylinders 232 in a hydraulic system according to an embodiment of the present application is shown.

[0091] In some embodiments, a double-acting cylinder 232 is provided in the hydraulic system. A first interface and a second interface are provided on the double-acting cylinder 232. The piston in the double-acting cylinder 232 moves between the first interface and the second interface of the double-acting cylinder 232 to drive the piston rod connected to the piston to move.

[0092] The hydraulic system is further provided with a second multi-way valve 252. A first port of the second multi-way valve 252 is in communication with a first port of the double-acting cylinder 232. A second port of the second multi-way valve 252 is in communication with a second port of the double-acting cylinder 232. A third port of the second multi-way valve 252 is in communication with an output end of the oil pump 220. A fourth port of the second multi-way valve 252 is in communication with an input end of the oil tank 210.

[0093] When the first interface of the second multi-way valve 252 is connected to the third interface of the second multi-way valve 252, so that the first interface of the double-acting cylinder 232 is connected to the output end of the oil pump 220, and the second interface of the second multi-way valve 252 is connected to the fourth interface of the second multi-way valve 252, so that the second interface of the double-acting cylinder 232 is connected to the input end of the oil tank 210, the piston in the double-acting cylinder 232 moves toward the second interface of the double-acting cylinder 232, and the piston rod connected to the piston extends;

[0094] When the first interface of the second multi-way valve 252 is connected with the fourth interface of the second multi-way valve 252, so that the first interface of the double-acting cylinder 232 is connected to the input end of the oil tank 210, the second interface of the second multi-way valve 252 is connected with the third interface of the second multi-way valve 252, so that the second interface of the double-acting cylinder 232 is connected to the output end of the oil pump 220, the piston in the double-acting cylinder 232 moves toward the first interface of the double-acting cylinder 232, and the piston rod connected to the piston retracts.

[0095] In an embodiment of the present application, the hydraulic system can include a single-acting cylinder 231 and a double-acting cylinder 232 at the same time. The simultaneous use of the single-acting cylinder 231 and the double-acting cylinder 232 can enable the hydraulic system to be applied to more machines, have a larger application field, and more application possibilities.

[0096] It should be noted that in some embodiments, when the first multi-way valve 251 and the second multi-way valve 252 are solenoid-operated steering valves, the opening or closing of the first multi-way valve 251 and the second multi-way valve 252 corresponds to the power-on or power-off state of the first multi-way valve 251 and the second multi-way valve 252. For example, powering on the first multi-way valve 251 indicates the opening state of the first multi-way valve 251, and powering off the first multi-way valve 251 indicates the closing state of the first multi-way valve 251.

[0097] In some embodiments, see Figure 1 and Figure 8 , Figure 8 A schematic diagram illustrates a bidirectional balancing valve 280 disposed between a double-acting cylinder 232 and a second multi-way valve 252 according to one embodiment of the present application. A first balancing valve is disposed between the first port of the double-acting cylinder 232 and the first port of the second multi-way valve 252, and a second balancing valve is disposed between the second port of the double-acting cylinder 232 and the second port of the second multi-way valve 252. The first balancing valve is provided with a third port, which communicates with any position between the second balancing valve and the second multi-way valve via a first pressure differential conduit. The second balancing valve is provided with a third port, which communicates with any position between the first balancing valve and the second multi-way valve via a second pressure differential conduit.

[0098] It should be noted that when the pressure difference between the first balancing valve and the second balancing valve is less than a set value, the first pressure differential pipeline and the second pressure differential pipeline are in a closed state.

[0099] The first pressure differential pipeline can only flow in one direction from the first balancing valve to the second balancing valve. When the pressure of the liquid in the first balancing valve is greater than the first set value of the liquid pressure in the second balancing valve, the first pressure differential pipeline is opened and the hydraulic oil in the first balancing valve flows to the second balancing valve.

[0100] The second pressure differential pipeline can only flow in one direction from the second balancing valve to the first balancing valve. When the pressure of the liquid in the second balancing valve is greater than the second set value of the liquid pressure in the first balancing valve, the second pressure differential pipeline is opened and the hydraulic oil in the first balancing valve flows to the second balancing valve.

[0101] This can prevent the double-acting oil cylinder 232 from automatically contracting when the load of the double-acting oil cylinder 232 has a small normal fluctuation. It also prevents the pressure difference on both sides of the double-acting oil cylinder from being too large, which may damage the hydraulic system.

[0102] In some embodiments, the hydraulic system is provided with a plurality of double-acting cylinders 232 , and each double-acting cylinder 232 is provided with a corresponding second multi-way valve 252 . That is, the number of the second multi-way valves 252 is the same as the number of the double-acting cylinders 232 .

[0103] In some embodiments, the oil pump 220 is a load-sensitive oil pump 220, the first multi-way valve 251 and the second multi-way valve 252 are load-sensitive proportional valves, the load-sensitive oil pump 220 is electrically connected to the load-sensitive proportional valve, and the load-sensitive proportional valve controls the speed of the oil pump 220 to control the pressure difference between the load oil pressure and the output oil pressure of the load-sensitive oil pump 220. The load oil pressure includes the oil pressure in the single-acting cylinder 231 and the oil pressure in the double-acting cylinder 232.

[0104] In an embodiment of the present application, the size of the oil outlet at the oil outlet of the oil circuit is fixed when oil is flowing in. By controlling the load-sensitive oil pump 220 to change the operating power, the oil output at the oil outlet of the oil circuit when oil is flowing in can be changed to control the extension speed of the single-acting cylinder 231 and the extension speed of the piston rod of the multi-acting cylinder.

[0105] In some embodiments, the load-sensitive oil pump 220 adjusts the operating power of the oil pump 220 so that the difference between the output oil pressure of the load-sensitive oil pump 220 and the load oil pressure always remains constant. In this way, the load-sensitive proportional valve changes the oil output at the oil outlet of the oil circuit during oil inflow by changing the size of the oil outlet of the oil circuit during oil inflow, thereby controlling the extension speed of the single-acting cylinder 231 and the extension speed of the piston rod of the multi-acting cylinder.

[0106] See also Figure 2 and Figure 9 , Figure 9 A schematic diagram of a vehicle hydraulic system provided with a filter 260 according to an embodiment of the present application is shown.

[0107] In some embodiments, the input end of the filter 260 is connected to the output end of the radiator 270, and the output end of the filter 260 is connected to the input end of the oil tank 210, so as to filter the hydraulic oil returning to the oil tank 210 and prevent the hydraulic oil from clogging the oil circuit.

[0108] See also Figure 2 and Figure 10 , Figure 10 FIG. 1 is a schematic diagram of a vehicle hydraulic system provided with a radiator 270 according to an embodiment of the present application.

[0109] In some embodiments, a radiator 270 is provided in the hydraulic system to cool the hydraulic oil that is about to enter the oil tank 210 while filtering the hydraulic oil.

[0110] In some embodiments, the output end of the independent oil circuit is connected to the input end of the filter 260 , and the output end of the filter 260 is connected to the input end of the oil tank 210 .

[0111] In some embodiments, the second end of the combined oil circuit is connected to the input end of the filter 260 via the first multi-way proportional valve, and the output end of the filter 260 is connected to the input end of the oil tank 210 .

[0112] In some embodiments, the fourth port of the second multi-way proportional valve is connected to the input end of the filter 260 , and the output end of the filter 260 is connected to the input end of the oil tank 210 .

[0113] See also Figure 11 , Figure 11 A schematic diagram of a garbage truck according to one embodiment of the present application is shown. The garbage truck may include a front end 120 and a body 110. The front end 120 is driven by a driver. The body 110 includes a frame 111 connected to the front end 120 and a box 112 mounted on the frame 111. The frame 111 supports the box 112.

[0114] It should be clear that in the embodiments of the present application, the garbage truck can apply the liquid system described in each embodiment of this document.

[0115] In some embodiments, the single-acting cylinder 231 is disposed between the vehicle box and the vehicle body and is used to push the vehicle box so that the vehicle box flips relative to the vehicle frame.

[0116] Exemplarily, a box lifting assembly 330 is provided in the garbage truck, and the box lifting assembly 330 includes a single-acting cylinder 231. The box lifting assembly is driven by the single-acting cylinder 231 and cooperates with the single-acting cylinder 231 to lift and lower the vehicle box 112.

[0117] For details, please refer to Figure 11 and Figure 12 , Figure 12 A schematic diagram of the structure of a garbage truck according to another embodiment of the present application is shown. The vehicle box 112 may include a box body 1121, the rear end of which is rotatably connected to the rear end of the vehicle frame 111, and the front end of the box body 1121 is capable of rotating about a rotation axis at the rear end of the box body 1121. A box body lifting assembly 330 is disposed on the vehicle frame 111 and is connected to the box body 1121 to enable raising and lowering of the box body 1121.

[0118] The box lifting assembly 330 may include a single-acting cylinder 231. One end of the single-acting cylinder 231 is disposed on the vehicle frame 111, and the other end is rotatably connected to the front end of the box 1121. The single-acting cylinder 231 can lift and support the front end of the box 1121, so that the box 1121 rotates around the rotation axis at the rear end of the box 1121, thereby enabling the dumping of garbage in the box 1121 and improving garbage disposal efficiency.

[0119] The cylinder body of the single-acting cylinder 231 is rotatably connected to the front end of the box body 1121, and the telescopic end of the single-acting cylinder 231 is rotatably connected to the frame 111. The telescopic end of the single-acting cylinder 231 is extended to lift the box body 1121 to dump garbage, and the telescopic end of the single-acting cylinder 231 is retracted to place the box body 1121 on the frame 111 to receive the garbage.

[0120] In some embodiments, the container lifting assembly 330 may further include a single-acting cylinder support 331 and a subframe 332. The single-acting cylinder support 331 is fixedly connected to the front end of the container 1121 and is rotatably connected to the cylinder of the single-acting cylinder 231. The subframe 332 is fixedly connected to the front end of the frame 111 and is rotatably connected to the telescopic end of the single-acting cylinder 231. When the single-acting cylinder 231 supports the container 1121, the weight of the container 1121 and the garbage can be evenly transferred to the frame 111 through the subframe 332, thereby ensuring the structural strength and reliability of the vehicle body 110.

[0121] In other embodiments, the single-acting cylinder support 331 is arranged at the lower part of the front end surface of the box body 1121 to prevent the box body 1121 from colliding with the single-acting cylinder 231 during lifting, thereby improving the safety and reliability of the single-acting cylinder 231.

[0122] In the above embodiment, since the single-acting cylinder 231 can achieve multi-stage speed change of the retraction speed, the box body 1121 of the garbage truck can also control the descending speed to meet the user's control requirements, while allowing the garbage truck to be applied to more scenarios.

[0123] In some embodiments, based on the description of the hydraulic system, a plurality of double-acting cylinders may be provided in the garbage truck to achieve different functions.

[0124] See also Figure 11 and Figure 12 In this embodiment, the vehicle box 112 may further include a top cover 1122 and a tailgate 1223. A loading port 11211 is defined at the top of the front end of the box body 1121, and a discharge port 11212 is defined at the rear end of the box body 1121. The top cover 1122 is openably and closably mounted on the loading port 11211, and the tailgate 1223 is openably and closably mounted on the discharge port 11212.

[0125] In this embodiment, the housing 1121 may include a compression chamber 11213 at the front end of the housing 1121 and a storage chamber 11214 at the rear end of the housing 1121. A delivery port 11211 is provided at the top of the compression chamber 11213. The storage chamber 11214 is in communication with the compression chamber 11213. When garbage enters the compression chamber 11213 through the delivery port 11211, the garbage is compressed in the compression chamber 11213 before being transferred to the storage chamber 11214 for storage. This improves space utilization within the garbage truck and enhances garbage collection efficiency.

[0126] Figure 13 A partial structural schematic diagram of a box body, a top cover, and a top cover opening and closing assembly according to an embodiment of the present application is shown. Figure 14 A partial structural schematic diagram of a box body, a tailgate, and a tailgate opening and closing assembly according to an embodiment of the present application is shown. Figure 15 A partial structural schematic diagram of a box body and a garbage compression assembly according to an embodiment of the present application is shown.

[0127] See Figures 11 to 15 In this embodiment, the garbage truck may include a top cover opening and closing assembly 310 for opening and closing the top cover 1122, a tailgate opening and closing assembly 320 for opening and closing the tailgate 1223, and a compression assembly 340 for compressing garbage. The top cover opening and closing assembly 310 may be disposed within the housing 1121 to drive the top cover to open and close the loading port 11211. The tailgate opening and closing assembly 320 may be disposed within the housing 1121 to drive the tailgate 1223 to open and close the discharge port 11212.

[0128] The compression assembly 340 includes a compression cylinder 2321, which is driven by the compression cylinder 2321 and cooperates with other components of the garbage compression assembly 340 to compress the garbage. The top cover opening and closing assembly 310 includes a top cover cylinder 2323, which is driven by the top cover cylinder 2323 and cooperates with other components of the top cover opening and closing assembly 310 to open and close the top cover 1122. The tailgate opening and closing assembly 320 includes a tailgate cylinder 2322, which is driven by the tailgate cylinder 2322 and cooperates with other components of the tailgate opening and closing assembly 320 to open and close the tailgate 1223.

[0129] When the garbage truck is collecting garbage, the top cover opening and closing assembly 310 opens the top cover 1122 and pours the garbage in the garbage bin 90 into the box body 1121 through the discharge port 11211. When the garbage truck dumps the garbage, the tailgate opening and closing assembly 320 can drive the tailgate 1223 to open the discharge port 11212. The garbage compression assembly 340 compresses the garbage in the box body to improve the compression efficiency of the garbage, thereby improving the space utilization rate in the box body 1121 and facilitating the compressed transportation of the garbage.

[0130] See Figure 11 、 Figure 12 、 Figure 13 and Figure 15 In this embodiment, the top cover opening and closing assembly 310 may include a top cover support 311, a bending member 312, a top cover cylinder support 313, and a top cover cylinder 2323. The top cover support 311 is disposed on the side wall of the storage bin 11214. The bending member 312 is hingedly connected to the top cover support 311 so that the bending member 312 can rotate around the top cover support 311. The top cover cylinder support 313 is disposed on the side wall of the storage bin 11214. The top cover cylinder support 313 is hingedly connected to the cylinder body of the top cover cylinder 2323, and the rotation axis of the top cover cylinder 2323 is arranged parallel to the rotation axis of the bending member 312. The telescopic end of the top cover cylinder 2323 is hinged to the bending piece 312 so that the top cover cylinder 2323 can push the bending piece 312 and the top cover 1122 to rotate around the top cover support 311, thereby opening and closing the loading port 11211.

[0131] When the car box 112 collects garbage, the telescopic end of the top cover cylinder 2323 extends out, the top cover cylinder 2323 rotates around the top cover cylinder support 313, and the bending part 312 and the top cover 1122 rotate around the top cover support 311, so that the top cover 1122 opens and the garbage can enter the box body 1121 through the delivery port 11211.

[0132] In some embodiments, the top cover support 311 is disposed on the front and / or rear sidewalls of the compression chamber 11213, and is located on a portion of the compression chamber 11213 away from the delivery port 11211. The rotation axis of the bending member 312 extends in the front-to-back direction. The top cover cylinder support 313 is disposed on the front and / or rear sidewalls of the compression chamber 11213, and is located on the side of the top cover support 311 away from the delivery port 11211. The rotation axis of the top cover cylinder 2323 extends in the front-to-back direction. In the vertical direction, the top cover cylinder support 313 is located below the top cover support 311, facilitating the opening and closing of the top cover 1122 by the top cover cylinder 2323.

[0133] When the telescopic end of the top cover cylinder support 313 is extended, the top cover cylinder 2323 rotates around the top cover cylinder support 313, the bending part 312 rotates around the top cover support 311 close to the delivery port 11211, and the top cover 1122 rotates upward around the top cover support 311 to open the delivery port 11211. In addition, the top cover 1122 can be kept away from the delivery port 11211 to prevent garbage from falling onto the top cover 1122 when dumping, thereby preventing the garbage from affecting the opening and closing of the top cover 1122, ensuring the safety and stability of the top cover opening and closing assembly 310, and improving the opening and closing efficiency of the top cover 1122.

[0134] In some embodiments, the top cover cylinder 2323 may be a double-acting cylinder with a single piston rod, which can realize reciprocating movement of the telescopic end, thereby realizing the opening and closing of the top cover 1122.

[0135] See Figure 11 、 Figure 12 、 Figure 14 In this embodiment, the upper portion of the tailgate 1223 is hinged to the upper portion of the rear end of the housing 1121. The tailgate opening and closing assembly 320 is disposed between the rear end of the housing 1121 and the tailgate 1223, so as to drive the tailgate 1223 toward the housing 1121 to close the discharge port 11212 or to drive the tailgate 1223 away from the housing 1121 to open the discharge port 11212. This reduces manual intervention, improves the safety of the garbage truck, and effectively increases work efficiency.

[0136] The tailgate opening and closing assembly 320 may include a tailgate cylinder 2322. The cylinder body of the tailgate cylinder 2322 is hinged to the lower portion of the housing 1121, and the telescopic end of the tailgate cylinder 2322 is hinged to the upper portion of the tailgate 1223. When the telescopic end of the tailgate cylinder 2322 is extended, the tailgate cylinder 2322 rotates to abut against the tailgate 1223, causing the lower portion of the tailgate 1223 to rotate away from the housing 1121, thereby opening the exhaust port 11212. When the telescopic end of the tailgate cylinder 2322 is retracted, the tailgate cylinder 2322 rotates to pull the tailgate 1223, causing the lower portion of the tailgate 1223 to rotate toward the housing 1121, thereby closing the exhaust port 11212.

[0137] In some embodiments, the tailgate cylinder 2322 may be a double-acting cylinder with a single piston rod, which can achieve reciprocating movement of the telescopic end, thereby achieving the opening and closing of the tailgate 1223 .

[0138] See Figure 11 、 Figure 12 and Figure 14 In this embodiment, a locking rod 321 may be provided on the tailgate 1223. The locking rod 321 is located on the side of the tailgate 1223 facing the box body 1121, and the locking rod 321 extends in opposite directions, and both ends of the locking rod 321 are fixedly connected to the tailgate 1223.

[0139] The tailgate opening and closing assembly 320 may also include a locking slider 322. The locking slider 322 is slidably disposed at the rear end of the housing 1121, below the exhaust port 11212. The upper portion of the locking slider 322 is hingedly connected to the cylinder body of the tailgate cylinder 2322, enabling the cylinder 2322 to move the locking slider 322 up and down during extension and retraction. A locking bevel 3221 is recessed on the side wall of the locking slider 322 facing away from the housing 1121 in the front-to-back direction, relative to the locking rod 321. The locking bevel 3221 extends downwardly at an angle in a plane perpendicular to the left-right direction.

[0140] When the tailgate 1223 is opened, the telescopic end of the tailgate cylinder 2322 extends, the locking slider 322 slides downward, the lower part of the tailgate 1223 rotates upward, the locking rod 321 disengages from the locking chute 3221, and the discharge port 11212 opens, so that the garbage in the box 1121 can be discharged through the discharge port 11212.

[0141] When the tailgate 1223 is closed, the telescopic end of the tailgate cylinder 2322 contracts, the locking slider 322 slides upward, the lower part of the tailgate 1223 rotates downward, and the locking rod 321 rotates into and abuts against the bottom of the locking inclined groove 3221, so that the locking rod 321 is limited on the locking slider 322, and the tailgate 1223 covers the rear end of the box body 1121 to close the discharge port 11212, thereby reducing labor costs and improving the opening and closing efficiency of the vehicle box 112.

[0142] In some embodiments, the tailgate opening and closing assembly 320 may further include a support latch 323. The lower end of the support latch 323 is rotatably connected to the locking slider 322, and the upper end of the support latch 323 is rotatable about the rotation axis of the lower end of the support latch 323 to switch between a supporting position and a folded position.

[0143] When the support latch 323 rotates to the supporting position, the upper end of the support latch 323 rotates away from the box body 1121, so that the upper end of the support latch 323 abuts and supports the tailgate 1223, thereby preventing the tailgate 1223 from accidentally closing and causing a safety hazard. When the support latch 323 rotates to the folded position, the support latch 323 moves away from the tailgate 1223, allowing the tailgate 1223 to close over the rear end of the box body 1121.

[0144] In some embodiments, the tailgate opening and closing assembly 320 may further include a sealing strip (not shown). The sealing strip is located at the rear end of the box 1121 and surrounds the outer periphery of the discharge port 11212. The sealing strip is capable of sealingly contacting the tailgate 1223 to improve the sealing performance of the vehicle box 112, prevent liquid waste from leaking to the outside, and improve the environmental performance of the garbage truck.

[0145] Figure 15 It is a partial structural diagram of the box body and the garbage compression assembly of the present invention.

[0146] See Figure 15 In this embodiment, the garbage compression assembly 340 may include a compression cylinder 2321 and a compression head 341. The compression cylinder 2321 and the compression head 341 are both located in the box 1121 to compress the garbage entering the box 1121 through the delivery port 11211, thereby reducing the space occupied by the garbage, improving the space utilization of the box 1121, and thus improving the efficiency of garbage transportation.

[0147] The cylinder body of the compression cylinder 2321 is connected to the box body 1121 , and the telescopic end of the compression cylinder 2321 is connected to the compression head 341 , so that the compression cylinder 2321 can push the compression head 341 to compress the garbage in the box body 1121 .

[0148] In some embodiments, the garbage compression assembly 340 can be disposed within the compression chamber 11213. A compression cylinder 2321 extends in a front-to-back direction. The cylinder body of the compression cylinder 2321 is connected to the front end wall of the compression chamber 11213, and the telescopic end of the compression cylinder 2321 is capable of extending and retracting rearward. The telescopic end of the compression cylinder 2321 is connected to the compression head 341, which pushes the head 341 backward, compressing the garbage and pushing it into the storage chamber 11214.

[0149] In some embodiments, the trash compression assembly 340 may further include a guide plate 342. The guide plate 342 is disposed within the compression chamber 11213, opposite the delivery port 11211, and located above the compression cylinder 2321. The guide plate 342 extends obliquely from front to back in a top-to-bottom direction. The guide plate 342 receives and guides trash poured into the delivery port 11211, thereby facilitating the reciprocating movement of the compression head 341 to compress the trash.

[0150] In some embodiments, when the compression cylinder 2321 contracts, the rear end of the guide plate 342 extends backward beyond the compression head 341 or is flush with the compression head 341, so that the garbage guided by the guide plate 342 falls into the rear side of the compression head 341, thereby improving the compression efficiency of the garbage, thereby improving the space utilization in the box body 1121, and facilitating the compression and transportation of the garbage.

[0151] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0152] It should be understood that the above content is only a preferred exemplary embodiment of the present application and is not intended to limit the implementation scheme of the present application. Ordinary technicians in this field can easily make corresponding changes or modifications based on the main concept and spirit of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection required by the claims.

Claims

1. A vehicle hydraulic system, characterized in that: The vehicle hydraulic system comprises: Oil tank, used to store hydraulic oil; An oil pump, used to extract the hydraulic oil in the oil tank and transport it; Single-acting cylinder, used to expand and contract according to the pressure generated by the hydraulic oil in the single-acting cylinder to push the load; A merging oil circuit, a first end of which is in communication with an interface of the single-acting oil cylinder, and a first valve is provided on the merging oil circuit; a first multi-way valve, the first multi-way valve being in communication with the second end of the merging oil circuit, and the first multi-way valve being used to control the second end of the merging oil circuit to be in communication with the output end of the oil pump or the input end of the oil tank; An independent oil circuit, the input end of the independent oil circuit is arranged between the first end of the merged oil circuit and the first valve, the output end of the independent oil circuit is connected to the input end of the oil tank, a second valve is provided on the independent oil circuit, and the independent oil circuit is used to transport the hydraulic oil in the single-acting cylinder to the oil tank.

2. The vehicle hydraulic system according to claim 1, characterized in that: The vehicle hydraulic system is further provided with a third valve, and both ends of the third valve are respectively connected to both sides of the second valve.

3. The vehicle hydraulic system according to claim 1, characterized in that: The first interface of the first multi-way valve is communicated with the second end of the merged oil circuit, the second interface of the first multi-way valve is communicated with the output end of the oil pump, and the third interface of the first multi-way valve is communicated with the input end of the oil tank; When the first port of the first multi-way valve is connected only to the second port of the first multi-way valve, the second end of the combined oil circuit is connected to the output end of the oil pump via the first multi-way valve, and the hydraulic oil in the oil tank can be delivered to the single-acting cylinder; When the first interface of the first multi-way valve is only connected to the third interface of the first multi-way valve, the second end of the merged oil circuit is connected to the input end of the oil tank via the first multi-way valve, and the hydraulic oil in the single-acting cylinder can be delivered to the oil tank.

4. The vehicle hydraulic system according to claim 1, characterized in that: The vehicle hydraulic system is provided with a double-acting cylinder, wherein a first interface and a second interface are provided on the double-acting cylinder, and a piston in the double-acting cylinder moves between the first interface and the second interface of the double-acting cylinder to drive a piston rod connected to the piston to move; The vehicle hydraulic system is further provided with a second multi-way valve, wherein a first interface of the second multi-way valve is communicated with a first interface of the double-acting cylinder, a second interface of the second multi-way valve is communicated with a second interface of the double-acting cylinder, a third interface of the second multi-way valve is communicated with an output end of the oil pump, and a fourth interface of the second multi-way valve is communicated with an input end of the oil tank; The first interface of the second multi-way valve is connected to the third interface of the second multi-way valve, and the second interface of the second multi-way valve is connected to the fourth interface of the second multi-way valve, so that the first interface of the double-acting cylinder is connected to the output end of the oil pump and the second interface of the double-acting cylinder is connected to the input end of the oil tank. The piston in the double-acting cylinder moves toward the second interface of the double-acting cylinder, and the piston rod extends. The first interface of the second multi-way valve is connected with the fourth interface of the second multi-way valve, and the second interface of the second multi-way valve is connected with the third interface of the second multi-way valve, so that the first interface of the double-acting cylinder is connected to the input end of the oil tank, and the second interface of the double-acting cylinder is connected to the output end of the oil pump. The piston in the double-acting cylinder moves toward the first interface of the double-acting cylinder, and the piston rod retracts.

5. The vehicle hydraulic system according to claim 1 or 4, characterized in that: The oil pump is a load-sensitive oil pump, and the first multi-way valve and the second multi-way valve are load-sensitive proportional valves. The load-sensitive oil pump and the load-sensitive proportional valve are signal-connected. The load-sensitive proportional valve controls the speed of the oil pump according to the acquired load oil pressure to control the pressure difference between the load oil pressure and the output oil pressure of the load-sensitive oil pump. The load oil pressure includes the oil pressure in the single-acting cylinder and the oil pressure in the double-acting cylinder.

6. The vehicle hydraulic system according to claim 2, characterized in that: The third valve is a manual valve.

7. The vehicle hydraulic system according to claim 1, characterized in that: At least one independent oil circuit is provided in the vehicle hydraulic system.

8. The vehicle hydraulic system according to claim 1, characterized in that A filter is provided in the vehicle hydraulic system, and the output end of the filter is connected to the input end of the oil tank for filtering the hydraulic oil that is about to enter the oil tank.

9. A garbage truck, characterized in that: The garbage truck is provided with a vehicle hydraulic system as described in any one of claims 1 to 8; as well as a vehicle body and a vehicle head, wherein the vehicle body includes a vehicle box and a vehicle frame, and the single-acting cylinder is provided between the vehicle box and the vehicle frame, and is used to push the vehicle box so that the vehicle box is flipped relative to the vehicle frame.

10. The garbage truck according to claim 9, characterized in that: The double-acting cylinders in the vehicle hydraulic system are provided with one or more, which are used as one or more of the following cylinders: A compression cylinder is provided in the garbage truck and is used to push and compress the garbage in the truck box; A tailgate cylinder is provided in the garbage truck and is used to push the tailgate provided on one side of the vehicle body to control the opening and closing of the tailgate; A top cover oil cylinder is provided in the garbage truck and is used to push the top cover provided at the loading port of the vehicle box to control the opening and closing of the loading port.

Images