Hydraulic control system of garbage truck

Abstract

The invention relates to the technical field of garbage trucks, in particular to a hydraulic control system of a garbage truck. The garbage truck hydraulic control system can comprise an oil tank assembly, an oil pump assembly, a first hydraulic assembly, a second hydraulic assembly and a pilot assembly. The oil pump assembly is provided with an oil inlet, a first oil outlet and a second oil outlet. The oil inlet is detachably connected with the oil tank assembly. The oil outlet flow of the first oil outlet is larger than that of the second oil outlet. The first hydraulic assembly comprises a first reversing valve and a first oil cylinder. The first reversing valve controls connection and disconnection between the first oil cylinder and the first oil outlet and between the first oil cylinder and the oil tank assembly. The second hydraulic assembly comprises a second reversing valve and a second oil cylinder. The pilot assembly comprises a pressure reducing valve and a back pressure valve. The hydraulic oil flow and pressure can be reasonably matched according to the working condition characteristics of different execution actions of the garbage truck hydraulic system, and therefore the problem that the garbage truck hydraulic control system is high in energy consumption is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of garbage trucks, and in particular to a hydraulic control system of a garbage truck. Background Art

[0002] Garbage truck is a special vehicle used by municipal sanitation departments to transport various types of garbage. Its main function is to collect and transport garbage, so as to avoid secondary pollution to the environment caused by various types of garbage. Garbage trucks can be composed of chassis, special devices, hydraulic control systems, operating systems, auxiliary devices, etc. The hydraulic control system of garbage trucks is an important part of garbage trucks. The hydraulic control system of garbage trucks can be composed of hydraulic oil tank assembly, oil pump, multi-way reversing valve, push shovel cylinder circuit, skateboard cylinder circuit, scraper cylinder circuit, lifting cylinder circuit, locking cylinder circuit and feeding cylinder circuit. The hydraulic control system can control the garbage truck to pour garbage, open or close the scraper, move the skateboard up or down, lift or lock the loader, push or retract the push shovel, etc., so as to process the garbage and prevent secondary pollution of garbage.

[0003] However, the current garbage truck hydraulic control system is unable to reasonably match the flow and pressure requirements of each actuator according to the different operating conditions of the vehicle, resulting in the problem of high energy consumption of the garbage truck hydraulic control system. Summary of the invention

[0004] In order to solve the problem of high energy consumption of the hydraulic control system of a garbage truck, the present invention provides a hydraulic control system for a garbage truck, comprising:

[0005] Fuel tank assembly;

[0006] An oil pump assembly, the oil pump assembly having an oil inlet, a first oil outlet and a second oil outlet; the oil inlet is detachably connected to the oil tank assembly; the oil flow rate of the first oil outlet is greater than the oil flow rate of the second oil outlet;

[0007] a first hydraulic assembly, the first hydraulic assembly comprising a first reversing valve and a first oil cylinder; the first reversing valve is detachably connected to the first oil outlet, the oil tank assembly and the first oil cylinder respectively; the first reversing valve controls the on-off between the first oil cylinder and the first oil outlet and the oil tank assembly respectively; the first reversing valve is an electro-hydraulic pilot reversing valve;

[0008] A second hydraulic assembly, the second hydraulic assembly comprising a second reversing valve and a second oil cylinder; the second reversing valve is detachably connected to the second oil outlet, the oil tank assembly and the second oil cylinder respectively; the second reversing valve controls the connection and disconnection between the second oil cylinder and the second oil outlet and the oil tank assembly respectively;

[0009] A pilot assembly, the pilot assembly comprising a pressure reducing valve and a back pressure valve; the oil inlet end of the pressure reducing valve is detachably connected to the second oil outlet; the oil outlet end of the pressure reducing valve is detachably connected to the tank assembly and the pilot control oil port of the first reversing valve respectively; the oil outlet end of the pressure reducing valve switches between the tank assembly and the pilot control oil port of the first reversing valve; the oil inlet end of the back pressure valve is detachably connected to the oil outlet end of the second reversing valve; the oil outlet end of the back pressure valve is detachably connected to the tank assembly; the second reversing valve controls the second oil outlet to switch between the second oil cylinder and the back pressure valve.

[0010] In some embodiments, the number of the first reversing valves and the first oil cylinders are respectively multiple; each of the first reversing valves corresponds to at least one of the first oil cylinders; the first reversing valve has a first working position, a second working position and a third working position; when the first reversing valve is located at the first working position and the third working position, the first oil cylinder is connected to the first oil outlet and the oil tank assembly respectively; the actions of the first oil cylinders corresponding to the first working position and the third working position are opposite; when multiple first reversing valves are all located at the second working position, the first oil cylinder is disconnected from the first oil outlet and the oil tank assembly respectively, and multiple first reversing valves are connected in series between the first oil outlet and the oil tank assembly in sequence.

[0011] In some embodiments, the plurality of first cylinders include at least a skateboard cylinder and a scraper cylinder.

[0012] In some embodiments, the plurality of first cylinders further include a dozer cylinder.

[0013] In some embodiments, the oil supply distances corresponding to the slide plate cylinder, the scraper cylinder and the push shovel cylinder increase successively; the oil supply distance is the oil delivery distance from the first oil outlet to the oil inlet end of the first reversing valve.

[0014] In some embodiments, the second reversing valve is a solenoid reversing valve or an electro-hydraulic pilot reversing valve.

[0015] In some embodiments, the plurality of second cylinders include at least a lifting cylinder, a locking cylinder and a loading cylinder; the lifting cylinder and the locking cylinder are connected in parallel and share one second reversing valve.

[0016] In some embodiments, the first hydraulic assembly further includes a first unloading valve, the oil inlet end of the first unloading valve is detachably connected to the first oil outlet; the oil outlet of the first unloading valve is detachably connected to the oil tank assembly; the first unloading valve has an on position and a off position.

[0017] In some embodiments, the second hydraulic assembly further includes a second unloading valve, the oil inlet end of the second unloading valve is detachably connected to the second oil outlet; the oil outlet of the second unloading valve is detachably connected to the oil tank assembly; the second unloading valve has an on position and a off position.

[0018] In some embodiments, the garbage truck hydraulic control system also includes a proportional overflow valve and a loading sensor; the oil inlet end of the proportional overflow valve is detachably connected to the second oil outlet; the oil outlet end of the proportional overflow valve is detachably connected to the oil tank assembly; the loading sensor is used to detect the load of the feeding cylinder; the loading sensor is electrically connected to the proportional overflow valve.

[0019] In order to solve the problem of high energy consumption of the hydraulic control system of the garbage truck, the present invention has the following advantages:

[0020] According to the flow requirements of each actuator, the hydraulic control system components are divided into the first hydraulic component and the second hydraulic component. The first hydraulic component is for large flow control, and the second hydraulic component is for small flow control. Correspondingly, the selection and design are carried out according to the requirements of the guide element, and the guide element and the hydraulic control system are formed into a whole, so that the volume, weight and cost advantages of the hydraulic control system are revealed. The first reversing valve for large flow control adopts pilot oil source control, and the pilot oil source and the second hydraulic component for small flow control have the same oil supply pipeline. That is, the pilot component is set in the second hydraulic component for small flow control. When the first hydraulic component has no action output, due to the small flow and pressure of the second hydraulic component, the flow loss of the hydraulic oil is small when the hydraulic oil flows through the pressure reducing valve back to the oil tank component, thereby achieving the effect of reducing energy consumption. When the second hydraulic component has no action output and the first hydraulic component has action output, due to the small flow of hydraulic oil in the second hydraulic component, the flow loss is less compared with the back pressure valve set in the first hydraulic component for large flow control. Thereby reducing the energy consumption of the hydraulic control system, and the back pressure valve does not need to select a high-specification model, so the weight, volume and cost can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram showing the structure of a hydraulic control system for a garbage truck according to an embodiment of the present invention is shown;

[0022] Figure 2 A schematic diagram showing the structure of a hydraulic control system for a garbage truck according to another embodiment;

[0023] Figure 3 A schematic structural diagram of a first reversing valve according to an embodiment is shown.

[0024] Figure numerals: oil tank assembly 10; oil pump assembly 20; oil inlet 21; first oil outlet 22; second oil outlet 23; first hydraulic assembly 30; first reversing valve 31; first interface 311; second interface 312; third interface 313; fourth interface 314; fifth interface 315; sixth interface 316; first cylinder 32; skateboard cylinder 321; scraper cylinder 322; shovel cylinder 323; first unloading valve 33; first safety valve 34; second hydraulic assembly 40; second reversing valve 41; second cylinder 42; lifting cylinder 421; locking cylinder 422; feeding cylinder 423; second unloading valve 43; second safety valve 44; proportional relief valve 45; pilot assembly 50; pressure reducing valve 51; back pressure valve 52. DETAILED DESCRIPTION

[0025] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0026] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0027] The current hydraulic control system usually adopts a conventional electro-hydraulic controlled multi-way reversing valve. The large-flow hydraulic system provides the pilot oil source for its own reversing valve, which is bound to have the disadvantages of large pilot power loss, waste of component flow capacity, large size, and heavy weight. That is, the hydraulic control system cannot reasonably match the flow and pressure for different action states, resulting in high energy loss. Therefore, in order to solve the above problems, the present invention provides a garbage truck hydraulic control system, such as Figure 1 As shown, the hydraulic control system of the garbage truck may include an oil tank assembly 10 , an oil pump assembly 20 , a first hydraulic assembly 30 , a second hydraulic assembly 40 and a pilot assembly 50 .

[0028] In this embodiment, if Figure 1 As shown, the oil tank assembly 10 can store the hydraulic oil required by the hydraulic control system, so that the hydraulic control system can operate normally and process garbage.

[0029] The oil pump assembly 20 may have an oil inlet 21, a first oil outlet 22, and a second oil outlet 23. The first oil outlet 22 may be in communication with the oil inlet end P1 of the first hydraulic assembly 30, the second oil outlet 23 may be in communication with the oil inlet end of the second hydraulic assembly 40, and the oil outlet end T1 of the first hydraulic assembly 30 and the oil outlet end T2 of the second hydraulic assembly 40 may be in communication with the oil tank assembly 10, respectively. The oil inlet 21 may be detachably connected to the oil tank assembly 10. The oil pump assembly 20 may be a double gear pump, which is driven by an engine or a motor through a power take-off or a coupling to pump the hydraulic oil of the oil tank assembly 10 out of the oil inlet 21. The oil pump assembly 20 can control the oil flow rate of the first oil outlet 22 to be greater than the oil flow rate of the second oil outlet 23, so that according to different execution action requirements such as dumping garbage by the garbage truck, opening or closing the scraper, moving the slide plate up or down, lifting or locking the loader, and pushing out or retracting the shovel, the first oil outlet 22 or the second oil outlet 23 can be used to supply oil, reasonably match the flow and pressure distribution of the hydraulic oil, and reduce the energy consumption of the hydraulic control system.

[0030] The first hydraulic assembly 30 may include a first reversing valve 31 and a first oil cylinder 32. The first reversing valve 31 is detachably connected to the first oil outlet 22, the oil tank assembly 10 and the first oil cylinder 32, respectively. The first reversing valve 31 can control the on-off between the first oil cylinder 32 and the first oil outlet 22 and the oil tank assembly 10, respectively. The first reversing valve 31 is an electro-hydraulic pilot reversing valve. By controlling the flow direction and pressure of the pilot hydraulic oil, the valve core working position of the first reversing valve 31 is changed. When the first reversing valve 31 controls the first oil cylinder 32 to be connected to the first oil outlet 22 and the oil tank assembly 10, respectively, the hydraulic oil supplied by the first oil outlet 22 can be supplied to the first oil cylinder 32 through the first reversing valve 31 and finally flow back to the oil tank assembly 10 through the first reversing valve 31. By changing the flow direction of the hydraulic oil through the first oil cylinder 32, the extension or retraction action of the first oil cylinder 32 can be controlled. When the first reversing valve 31 controls the first oil cylinder 32 to be disconnected from the first oil outlet 22 and the oil tank assembly 10 respectively, the hydraulic oil supplied by the first oil outlet 22 can directly flow back to the oil tank assembly 10 through the first reversing valve 31 without passing through the first oil cylinder 32. At this time, the first oil cylinder 32 has no action output. The first hydraulic assembly 30 requires a large flow rate and a large power in the process of recycling garbage, so the oil flow rate of the first oil outlet 22 can be greater than the oil flow rate of the second oil outlet 23, so that the first hydraulic assembly 30 can be controlled for a large flow rate. The first hydraulic control assembly with a large flow rate can control multiple first oil cylinders 32 to perform action output. Using a hydraulic control system with a large flow rate control to control action elements with a large flow rate and a large power can improve execution efficiency.

[0031] The second hydraulic assembly 40 may include a second reversing valve 41 and a second oil cylinder 42. The second reversing valve 41 is detachably connected to the second oil outlet 23, the oil tank assembly 10, and the second oil cylinder 42, respectively. The second reversing valve 41 controls the on-off between the second oil cylinder 42 and the second oil outlet 23 and the oil tank assembly 10, respectively. When the second oil cylinder 42 of the second hydraulic assembly 40 has no action output, the hydraulic oil of the second oil outlet 23 can flow through the pilot assembly 50 and return to the oil tank assembly 10, and does not flow through the second oil cylinder 42. When the second oil cylinder 42 of the second hydraulic assembly 40 has an action output, the hydraulic oil of the second oil outlet 23 can flow through the second reversing valve 41, enter the second oil cylinder 42, and then return to the oil tank assembly 10. In the process of recycling garbage, the second hydraulic assembly 40 uses a small flow rate and a low power. Since the oil flow rate of the first oil outlet 22 is greater than the oil flow rate of the second oil outlet 23, the second hydraulic assembly 40 can be controlled by a small flow rate. Using a small flow control hydraulic control system to control small flow and low power execution actions can reduce the energy consumption of the hydraulic control system.

[0032] The pilot assembly 50 may include a pressure reducing valve 51 and a back pressure valve 52. The oil inlet end of the pressure reducing valve 51 is detachably connected to the second oil outlet 23. The oil outlet end of the pressure reducing valve 51 is detachably connected to the pilot control oil ports of the oil tank assembly 10 and the first reversing valve 31, respectively. The oil outlet end of the pressure reducing valve 51 is switched between the oil tank assembly 10 and the pilot control oil port of the first reversing valve 31. The oil inlet end of the back pressure valve 52 is detachably connected to the oil outlet end of the second reversing valve 41. The oil outlet end of the back pressure valve 52 is detachably connected to the oil tank assembly 10. The second reversing valve 41 can control the second oil outlet 23 to switch between the second oil cylinder 42 and the back pressure valve 52. The first reversing valve 31 for large flow control is controlled by a pilot oil source, and the pilot oil source has the same oil supply pipeline as the second hydraulic assembly 40 for small flow control. That is, the pilot assembly 50 is arranged in the second hydraulic assembly 40 of small flow control. When the first hydraulic assembly 30 has no action output, since the flow rate and pressure of the second hydraulic assembly 40 are small, when the hydraulic oil flows through the pressure reducing valve 51 and returns to the oil tank assembly 10, the flow loss of the hydraulic oil is small, thereby achieving the effect of reducing energy consumption. When the second hydraulic assembly 40 has no action output and the first hydraulic assembly 30 has an action output, a part of the hydraulic oil of the second oil outlet 23 flows through the pressure reducing valve 51 to the first reversing valve 31, providing the first reversing valve 31 with the hydraulic oil required for reversing, so that the hydraulic oil of the first oil outlet 22 flows through the first reversing valve 31, providing the first oil cylinder 32 with hydraulic oil, so that the first hydraulic assembly 30 has a corresponding action output. Another part of the hydraulic oil in the second oil outlet 23 flows back from the back pressure valve 52 to the oil tank assembly 10. Compared with the back pressure valve 52 being set in the first hydraulic assembly 30 with large flow control, the back pressure valve 52 is set in the second hydraulic assembly 40 with small flow control in this solution, and the power loss flowing through the back pressure valve 52 is greatly reduced. Thus, the energy consumption of the hydraulic control system is reduced, and the back pressure valve 52 does not need to be a high-specification model, so that the weight, volume and cost can be greatly reduced.

[0033] In some embodiments, Figure 1 As shown, a first safety valve 34 can be provided in the first hydraulic assembly 30, and a second safety valve 44 can be provided in the second hydraulic assembly 40. When the pressure of the hydraulic control system is less than the set pressure of the first safety valve 34 or the second safety valve 44, the first safety valve 34 or the second safety valve 44 is in a closed state, and the hydraulic control system works normally at this time. When the pressure of the hydraulic control system reaches or exceeds the set pressure of the first safety valve 34 or the second safety valve 44, the valve core of the first safety valve 34 or the second safety valve 44 opens, and part of the hydraulic oil flows back to the oil tank from the oil outlet of the first safety valve 34 or the second safety valve 44, so that the system pressure no longer increases, thereby keeping the pressure of the hydraulic control system within the set range, and preventing the pressure in the hydraulic control system from being too high, which may cause safety hazards.

[0034] In this embodiment, if Figure 2 , Figure 3 As shown, the number of the first reversing valve 31 and the first oil cylinder 32 can be multiple, and the multiple first reversing valves 31 are arranged in sequence along the preset direction. Each first reversing valve 31 can correspond to at least one first oil cylinder 32. The first reversing valve 31 can be a three-position six-way valve, and the first reversing valve 31 can have a first working position, a second working position and a third working position. The first reversing valve 31 has a first interface 311, a second interface 312, a third interface 313, a fourth interface 314, a fifth interface 315, and a sixth interface 316. When the first reversing valve 31 is located in the first working position and the third working position, the first oil cylinder 32 is connected to the first oil outlet 22 and the oil tank assembly 10 respectively. That is, when the first reversing valve 31 is located in the first working position, the first interface 311 is connected to the first oil outlet 22, the fourth interface 314 is connected to the first oil cylinder 32, and the first interface 311 is connected to the fourth interface 314. The second interface 312 is disconnected from the fifth interface 315. The third interface 313 is connected to the oil tank assembly 10, the sixth interface 316 is connected to the first oil cylinder 32, and the third interface 313 is connected to the sixth interface 316. The first oil cylinder 32 corresponding to the first and third working positions has opposite actions, and the first hydraulic assembly 30 is in operation.

[0035] When the plurality of first reversing valves 31 are all located in the second working position, the first oil cylinder 32 is disconnected from the first oil outlet 22 and the oil tank assembly 10 respectively, and the plurality of first reversing valves 31 are connected in series between the first oil outlet 22 and the oil tank assembly 10 in sequence, that is, when the first reversing valve 31 is located in the second working position, the third interface 313 is disconnected from the fourth interface 314. The second interface 312 is connected to the second oil outlet 23, the fifth interface 315 is connected to the oil tank assembly 10, and the second interface 312 is connected to the fifth interface 315. The first interface 311 is disconnected from the sixth interface 316. Assuming there are three first reversing valves 31, the second interface 312 of the first reversing valve 31 arranged in the first position is connected to the second oil inlet 21, the last first reversing valve 31 is connected to the oil tank assembly 10, and the second interface 312 of the first reversing valve 31 is connected to the fifth interface 315 of the last first reversing valve 31, so that the three first reversing valves 31 are connected in series. Therefore, the hydraulic oil in the first oil outlet 22 can directly return to the oil tank assembly 10 without passing through the resistance element, thereby simplifying the oil circuit design and avoiding useless energy consumption of the first hydraulic assembly 30 .

[0036] In this embodiment, if Figure 1As shown, the plurality of first cylinders 32 at least include a skateboard cylinder 321 and a scraper cylinder 322. The skateboard cylinder 321 can be connected to the first hydraulic assembly 30. The scraper cylinder 322 can be connected to the first hydraulic assembly 30. When the hydraulic oil flows from the first reversing valve 31 into the skateboard cylinder 321, the skateboard of the garbage truck can move. When the hydraulic oil flows from the first reversing valve 31 into the scraper cylinder 322, the scraper can rotate at a certain angle. The skateboard cylinder 321 and the scraper cylinder 322 cooperate with each other to compress the garbage into the garbage bin of the vehicle, thereby achieving garbage compression. The required flow rate of the skateboard cylinder 321 and the scraper cylinder 322 is large, and the power is large. Connecting them to the first hydraulic assembly 30 with large flow control can improve the efficiency of garbage compression.

[0037] In this embodiment, if Figure 1 As shown, the plurality of first oil cylinders 32 may further include a push shovel oil cylinder 323. The push shovel oil cylinder 323 may be connected to the first hydraulic assembly 30. The push shovel may compress or push out the garbage in the vehicle trash bin, thereby increasing the loading capacity of the garbage and improving the transportation efficiency of the garbage truck. That is, each time the garbage is scraped into the trash bin by the scraper, the push shovel oil cylinder 323 will be compressed, and when the garbage arrives at the garbage treatment plant, the garbage in the trash bin needs to be pushed out, so the push shovel oil cylinder 323 requires a large flow rate and a large power, and may be connected to the first hydraulic assembly 30 with large flow control, thereby improving the operation efficiency of garbage collection.

[0038] In this embodiment, if Figure 1 As shown, since the pressure loss in the first hydraulic assembly 30 increases with the increase of the oil supply distance of the garbage truck, the oil supply distances corresponding to the slide cylinder 321, the scraper cylinder 322 and the push shovel cylinder 323 in the multiple first oil cylinders 32 are increased in sequence. The oil supply distance is the oil delivery distance from the first oil outlet 22 to the oil inlet end of the first reversing valve 31. Therefore, in a limited space, according to the action frequency of the action elements, the oil supply path of the slide cylinder 321 is reduced first, and then the oil supply path of the scraper cylinder 322 is reduced, thereby reducing the flow loss of the hydraulic control system.

[0039] In this embodiment, if Figure 1As shown, the number of the second reversing valve 41 and the second oil cylinder 42 can be multiple, and the multiple second reversing valves 41 are arranged in sequence along the preset direction. Each second reversing valve 41 can correspond to at least one second oil cylinder 42. The second reversing valve 41 is similar in structure to the first reversing valve 31. The second reversing valve 41 can also be a three-position six-way valve. The first reversing valve 31 is an electro-hydraulic pilot reversing valve, and the second reversing valve 41 is an electromagnetic reversing valve or an electro-hydraulic pilot reversing valve. The second reversing valve 41 also has a first working position, a second working position, and a third working position. When the second reversing valve 41 is located in the first working position and the third working position, the second reversing valve 41 is connected to the second oil outlet 23 and the oil tank assembly 10, and at this time, the second oil cylinder 42 of the second hydraulic assembly 40 has an action output. When the second reversing valve 41 is located at the first working position, the sixth interface 316 of the second reversing valve 41 is connected to the second oil inlet 21, the third interface 313 of the second reversing valve 41 is connected to the second oil cylinder 42, and the third interface 313 of the second reversing valve 41 is connected to the sixth interface 316. The first interface 311 of the second reversing valve 41 is connected to the second oil cylinder 42, the fourth interface 314 of the second reversing valve 41 is connected to the oil tank assembly 10, and the first interface 311 of the second reversing valve 41 is connected to the fourth interface 314. The second interface 312 of the second reversing valve 41 is disconnected from the fifth interface 315. The actions of the second oil cylinder 42 corresponding to the first working position of the second reversing valve 41 and the third working position of the second reversing valve 41 are opposite. When the second reversing valve 41 is located at the second working position, the second oil cylinder 42 is disconnected from the second oil outlet 23 and the oil tank assembly 10 respectively, and the plurality of second reversing valves 41 are connected in series in sequence. That is, when the second reversing valve 41 is in the second working position, the third interface 313 of the second reversing valve 41 is disconnected from the fourth interface 314, the first interface 311 of the second reversing valve 41 is disconnected from the sixth interface 316, the second interface 312 of the second reversing valve 41 is connected to the back pressure valve 52, the fifth interface 315 of the second reversing valve 41 is connected to the second oil inlet 21, the second interface 312 of the second reversing valve 41 is connected to the fifth interface 315, and when there are multiple second reversing valves 41, the fifth interface 315 of the first second reversing valve 41 is connected to the second interface 312 of the last second reversing valve 41. According to different flow requirements, the second reversing valve can select an electromagnetic reversing valve or a small flow electro-hydraulic pilot reversing valve, so as to have good economy and low cost.

[0040] In this embodiment, if Figure 1As shown, the plurality of second cylinders 42 may include at least a lifting cylinder 421, a locking cylinder 422 and a loading cylinder 423. The lifting cylinder 421 and the locking cylinder 422 are connected in parallel and share a second reversing valve 41. When the garbage truck arrives at the garbage disposal plant, the locking cylinder 422 opens to release the mechanical connection of the garbage bin loader, and then the lifting cylinder 421 can lift the garbage bin loader of the garbage truck, and the shovel cylinder 323 pushes the garbage in the garbage bin out. The lifting cylinder 421 then closes the loader. The locking cylinder 422 then locks the garbage bin and loader of the garbage truck to prevent leakage of the garbage during compression and transportation. When collecting garbage, the loading cylinder 423 can lift the civilian garbage bin and pour the garbage into the filling bucket of the vehicle. Since the lifting cylinder 421, the locking cylinder 422 and the feeding cylinder 423 have a small working flow and low power, they are connected to the second hydraulic component 40 with small flow control, which can effectively reduce the energy consumption of the hydraulic control system.

[0041] In some embodiments, the communication positions of the lifting cylinder 421, the locking cylinder 422, the loading cylinder 423, the slide cylinder 321, the scraper cylinder 322, and the push shovel cylinder 323 can be adjusted, for example, the loading cylinder 423 can be adjusted to the first hydraulic assembly 30. Other cylinder components can also be added to the first hydraulic assembly 30 or the second hydraulic assembly 40.

[0042] In this embodiment, if Figure 1 As shown, the first hydraulic assembly 30 may further include a first unloading valve 33, and the oil inlet end of the first unloading valve 33 is detachably connected to the first oil outlet 22. The oil outlet of the first unloading valve 33 is detachably connected to the oil tank assembly 10. The first unloading valve 33 has an on position and a off position. When the first oil cylinder 32 of the first hydraulic assembly 30 has no action output, the first unloading valve 33 is in the on position, which can shorten the distance between the first oil outlet 22 and the oil tank assembly 10, thereby achieving the purpose of shortening the oil return distance, thereby reducing the energy consumption of the hydraulic control system.

[0043] In this embodiment, if Figure 2 As shown, the second hydraulic assembly 40 may further include a second unloading valve 43, and the oil inlet end of the second unloading valve 43 is detachably connected to the second oil outlet 23. The oil outlet of the second unloading valve 43 is detachably connected to the oil tank assembly 10. The second unloading valve 43 has an on position and a off position. The first unloading valve 33 and the second unloading valve 43 may adopt a two-position three-way valve. As long as the first unloading valve 33 or the second unloading valve 43 has a off position and an on position, the second unloading valve 43 can effectively reduce the power loss of the hydraulic control system in the standby state, thereby achieving an energy-saving effect.

[0044] When the first hydraulic assembly 30 and the second hydraulic assembly 40 have no action output, the hydraulic oil in the first oil outlet 22 returns to the oil tank assembly 10 through the conduction position of the first unloading valve 33. A part of the hydraulic oil in the second oil outlet 23 can flow directly into the oil tank assembly 10 through the conduction position of the second unloading valve 43, and the other part of the hydraulic oil flows into the oil tank assembly 10 from the pressure reducing valve 51, and the flow loss through the pressure reducing valve 51 is small. The setting of the second unloading valve 43 can prevent the hydraulic oil in the second hydraulic assembly 40 from flowing back to the oil tank assembly 10 through the back pressure valve 52, thereby reducing the energy loss of the hydraulic control system.

[0045] When the first oil cylinder 32 of the first hydraulic assembly 30 has an action output and the second oil cylinder 42 of the second hydraulic assembly 40 has no action output, the second unloading valve 43 is in the cut-off position, and a part of the hydraulic oil of the second oil outlet 23 is transmitted from the pressure reducing valve 51 to the first reversing valve 31, so that the first reversing valve 31 is in a suitable working position, so that the hydraulic oil of the first oil outlet 22 flows through the first reversing valve 31 and enters the first oil cylinder 32, so that the first hydraulic assembly 30 has a corresponding action output. Another part of the hydraulic oil flows into the oil tank assembly 10 from the oil outlet end of the back pressure valve 52. Since the second hydraulic assembly 40 is a small flow control, the back pressure valve 52 is arranged in the second hydraulic assembly 40, so the energy loss caused by the back pressure valve 52 is small, thereby reducing the flow loss of the hydraulic oil flowing through the back pressure valve 52.

[0046] When the first oil cylinder 32 of the first hydraulic assembly 30 has no action output and the second oil cylinder 42 of the second hydraulic assembly 40 has action output, the first unloading valve 33 is in the on position, and the hydraulic oil of the first oil outlet 22 flows through the first unloading valve 33 and returns to the mailbox assembly. The second unloading valve 43 is in the off position, so that the second hydraulic assembly 40 has sufficient hydraulic oil pressure, and a part of the hydraulic oil flows into the second oil cylinder 42, so that the second oil cylinder 42 operates, and flows into the oil tank assembly 10 from the oil outlet end of the second hydraulic assembly 40. The other part of the hydraulic oil flows directly into the oil tank assembly 10 from the pressure reducing valve 51 without reversing the first reversing valve 31. Since the second hydraulic assembly 40 is a small flow control, the flow loss flowing through the pressure reducing valve 51 is small, thereby reducing the energy loss of the hydraulic control system.

[0047] When the first hydraulic assembly 30 and the second hydraulic assembly 40 have action output at the same time, the first unloading valve 33 and the second unloading valve 43 are in the cut-off position, and the hydraulic oil of the first oil outlet 22 flows through the first reversing valve 31 and enters the first oil cylinder 32, so that the first hydraulic assembly 30 has a corresponding action output. A part of the hydraulic oil of the second oil inlet 21 flows into the second oil cylinder 42, so that the second oil cylinder 42 operates, and flows into the oil tank assembly 10 from the oil outlet end of the second hydraulic assembly 40, so that the second hydraulic assembly 40 has a corresponding action output. Another part of the hydraulic oil flows from the pressure reducing valve 51 to the first reversing valve 31, providing it with reversing power. In this way, there is no redundant flow consumption, thereby reducing the energy consumption of the hydraulic control system.

[0048] In this embodiment, if Figure 1 As shown, the hydraulic control system of the garbage truck also includes a proportional relief valve 45 and a loading sensor. The oil inlet end of the proportional relief valve 45 is detachably connected to the second oil outlet 23. The oil outlet end of the proportional relief valve 45 is detachably connected to the oil tank assembly 10. The loading sensor is used to detect the load of the feeding cylinder 423. The loading sensor is electrically connected to the proportional relief valve 45. The proportional relief valve 45 can set the pressure of the feeding cylinder 423 circuit according to the feedback of the loading sensor, that is, when the feeding cylinder 423 is extended, the garbage in the civil garbage can is fully loaded at the beginning, and the civil garbage can is a garbage can commonly used by residents in their daily lives. Therefore, the load of the feeding cylinder 423 is large, and the proportional relief valve 45 starts to output the maximum setting value of the allowable working range. With the change of the parameters of the loading weighing system and the lifting angle of the civil garbage can, the garbage in the civil garbage can is gradually poured into the garbage truck, so that the load of the feeding cylinder 423 is gradually reduced, so the output pressure of the proportional pressure reducing valve 51 is controlled to gradually decrease. When the lifting angle reaches the maximum, the garbage in the civil garbage bin is emptied. At this time, the output pressure value of the proportional pressure reducing valve 51 is the minimum, which is the pressure value that can retract the feeding cylinder 423. In this working process, no overflow loss is generated, and when the action is in place, the overflow loss is much lower than the safety valve, thereby achieving energy saving. When the feeding cylinder 423 retracts, the output pressure of the proportional relief valve 45 can remain unchanged. In this working process, no overflow loss is generated, and when the action is in place, the overflow loss is much lower than the safety valve, thereby achieving energy saving.

[0049] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A hydraulic control system for a garbage truck, characterized in that: The hydraulic control system of the garbage truck comprises: Fuel tank assembly; An oil pump assembly, the oil pump assembly having an oil inlet, a first oil outlet and a second oil outlet; the oil inlet is detachably connected to the oil tank assembly; the oil flow rate of the first oil outlet is greater than the oil flow rate of the second oil outlet; a first hydraulic assembly, the first hydraulic assembly comprising a first reversing valve and a first oil cylinder; the first reversing valve is detachably connected to the first oil outlet, the oil tank assembly and the first oil cylinder respectively; the first reversing valve controls the on-off between the first oil cylinder and the first oil outlet and the oil tank assembly respectively; the first reversing valve is an electro-hydraulic pilot reversing valve; A second hydraulic assembly, the second hydraulic assembly comprising a second reversing valve and a second oil cylinder; the second reversing valve is detachably connected to the second oil outlet, the oil tank assembly and the second oil cylinder respectively; the second reversing valve controls the connection and disconnection between the second oil cylinder and the second oil outlet and the oil tank assembly respectively; A pilot assembly, the pilot assembly comprising a pressure reducing valve and a back pressure valve; the oil inlet end of the pressure reducing valve is detachably connected to the second oil outlet; the oil outlet end of the pressure reducing valve is detachably connected to the tank assembly and the pilot control oil port of the first reversing valve respectively; the oil outlet end of the pressure reducing valve switches between the tank assembly and the pilot control oil port of the first reversing valve; the oil inlet end of the back pressure valve is detachably connected to the oil outlet end of the second reversing valve; the oil outlet end of the back pressure valve is detachably connected to the tank assembly; the second reversing valve controls the second oil outlet to switch between the second oil cylinder and the back pressure valve.

2. A garbage truck hydraulic control system according to claim 1, characterized in that: There are multiple first reversing valves and multiple first oil cylinders; each first reversing valve corresponds to at least one first oil cylinder; the first reversing valve has a first working position, a second working position and a third working position; when the first reversing valve is located at the first working position and the third working position, the first oil cylinder is connected to the first oil outlet and the oil tank assembly respectively; the actions of the first oil cylinders corresponding to the first working position and the third working position are opposite; when multiple first reversing valves are all located at the second working position, the first oil cylinder is disconnected from the first oil outlet and the oil tank assembly respectively, and multiple first reversing valves are connected in series between the first oil outlet and the oil tank assembly in sequence.

3. A hydraulic control system for a garbage truck according to claim 1, characterized in that: The plurality of first cylinders include at least a slide plate cylinder and a scraper cylinder.

4. A garbage truck hydraulic control system according to claim 3, characterized in that: The plurality of first cylinders further include a push blade cylinder.

5. A hydraulic control system for a garbage truck according to claim 4, characterized in that: The oil supply distances corresponding to the slide plate cylinder, the scraper cylinder and the push shovel cylinder increase in sequence; the oil supply distance is the oil delivery distance from the first oil outlet to the oil inlet end of the first reversing valve.

6. A hydraulic control system for a garbage truck according to claim 1, characterized in that: The second reversing valve is a solenoid reversing valve or an electro-hydraulic pilot reversing valve.

7. A garbage truck hydraulic control system according to claim 1, characterized in that: The plurality of second oil cylinders at least include a lifting oil cylinder, a locking oil cylinder and a feeding oil cylinder; the lifting oil cylinder and the locking oil cylinder are connected in parallel and share one second reversing valve.

8. A garbage truck hydraulic control system according to claim 1, characterized in that: The first hydraulic assembly also includes a first unloading valve, the oil inlet end of the first unloading valve is detachably connected to the first oil outlet; the oil outlet of the first unloading valve is detachably connected to the oil tank assembly; the first unloading valve has an on position and a off position.

9. A hydraulic control system for a garbage truck according to claim 7, characterized in that: The second hydraulic assembly also includes a second unloading valve, the oil inlet end of the second unloading valve is detachably connected to the second oil outlet; the oil outlet of the second unloading valve is detachably connected to the oil tank assembly; the second unloading valve has an on position and a off position.

10. A hydraulic control system for a garbage truck according to claim 9, characterized in that: The garbage truck hydraulic control system also includes a proportional overflow valve and a loading sensor; the oil inlet end of the proportional overflow valve is detachably connected to the second oil outlet; the oil outlet end of the proportional overflow valve is detachably connected to the oil tank assembly; the loading sensor is used to detect the load of the feeding cylinder; the loading sensor is electrically connected to the proportional overflow valve.

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