A hydraulic control system for a refuse truck

Abstract

The present application relates to the technical field of garbage trucks, in particular to a garbage truck hydraulic control system. The garbage truck hydraulic control system can include an oil tank assembly, an oil pump assembly, a first hydraulic assembly, a second hydraulic assembly, and a pilot assembly. The oil pump assembly has 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 of the first oil outlet is greater than that of the second oil outlet. The first hydraulic assembly includes a first directional valve and a first oil cylinder. The first directional valve controls the on-off between the first oil cylinder and the first oil outlet and the oil tank assembly. The second hydraulic assembly includes a second directional valve and a second oil cylinder. The pilot assembly includes a pressure reducing valve and a back pressure valve. The present application can reasonably match the hydraulic oil flow and pressure according to the working condition characteristics of different garbage truck hydraulic system execution actions, thus solving the problem of high energy consumption of the garbage truck hydraulic control system.

Description

Technical Field

[0001] This invention relates to the field of garbage truck technology, and more specifically, to a hydraulic control system for garbage trucks. Background Technology

[0002] Garbage trucks are specialized vehicles used by municipal sanitation departments to transport various types of waste. Their main function is to collect and transport garbage, thereby preventing secondary pollution of the environment. A garbage truck typically consists of a chassis, specialized equipment, a hydraulic control system, an operating system, and auxiliary devices. The hydraulic control system is a crucial component of the garbage truck. It can be composed of a hydraulic oil tank assembly, an oil pump, a multi-way directional valve, a pusher cylinder circuit, a sliding plate cylinder circuit, a scraper cylinder circuit, a lifting cylinder circuit, a locking cylinder circuit, and a loading cylinder circuit. The hydraulic control system controls the garbage truck's actions such as dumping garbage, opening or closing the scraper, moving the sliding plate up or down, lifting or locking the loader, and pushing or retracting the pusher, thus processing the garbage and preventing secondary pollution.

[0003] However, current garbage truck hydraulic control systems cannot properly match the flow and pressure requirements of each actuator according to different operating conditions of the vehicle, resulting in high energy consumption of the garbage truck hydraulic control system. Summary of the Invention

[0004] To address the high energy consumption of hydraulic control systems in garbage trucks, this invention provides a hydraulic control system for garbage trucks, comprising:

[0005] Fuel tank assembly;

[0006] An oil pump assembly has 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 includes a first directional valve and a first hydraulic cylinder; the first directional valve is detachably connected to the first oil outlet, the oil tank assembly, and the first hydraulic cylinder; the first directional valve controls the on / off connection between the first hydraulic cylinder and the first oil outlet and the oil tank assembly; the first directional valve is an electro-hydraulic pilot directional valve.

[0008] The second hydraulic assembly includes a second directional valve and a second cylinder; the second directional valve is detachably connected to the second oil outlet, the oil tank assembly, and the second cylinder; the second directional valve controls the connection and disconnection between the second cylinder and the second oil outlet and the oil tank assembly.

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

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

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

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

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

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

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

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

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

[0018] In some embodiments, the garbage truck hydraulic control system further includes a proportional relief valve and a loading sensor; the oil inlet of the proportional relief valve is detachably connected to the second oil outlet; the oil outlet of the proportional relief 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 relief valve.

[0019] To address the issue of high energy consumption in the hydraulic control system of garbage trucks, this invention offers the following advantages:

[0020] Based on the flow requirements of each actuator, the hydraulic control system is divided into a first hydraulic assembly and a second hydraulic assembly. The first hydraulic assembly controls high flow rates, while the second hydraulic assembly controls low flow rates. Correspondingly, the guide elements are selected and designed according to their requirements, and integrated with the hydraulic control system to achieve a unified design, thus highlighting the advantages of the hydraulic control system in terms of size, weight, and cost. The first directional valve for high flow control uses a pilot oil source, which shares the same oil supply line as the second hydraulic assembly for low flow control. That is, the pilot assembly is located within the second hydraulic assembly for low flow control. When the first hydraulic assembly has no output, due to the lower flow rate and pressure of the second hydraulic assembly, the hydraulic oil experiences less flow loss when returning to the tank assembly via the pressure reducing valve, thereby reducing energy consumption. When the second hydraulic assembly has no output and the first hydraulic assembly has output, the flow rate in the second hydraulic assembly is lower than when the back pressure valve is located in the first hydraulic assembly for high flow control, resulting in less flow loss. This reduces the energy consumption of the hydraulic control system, and the back pressure valve does not require a high-specification model, significantly reducing weight, size, and cost. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a garbage truck hydraulic control system according to one embodiment is shown;

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

[0023] Figure 3 A schematic diagram of the structure of a first reversing valve according to one embodiment is shown.

[0024] Reference 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 directional valve 31; First interface 311; Second interface 312; Third interface 313; Fourth interface 314; Fifth interface 315; Sixth interface 316; First cylinder 32; Slide plate cylinder 321; Scraper cylinder 322; Pusher cylinder 323; First unloading valve 33; First safety valve 34; Second hydraulic assembly 40; Second directional valve 41; Second cylinder 42; Lifting cylinder 421; Locking cylinder 422; Loading 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 Implementation

[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, and are not intended to imply any limitation on the scope of the disclosure.

[0026] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based 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 terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. 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 a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, 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 or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0027] Current hydraulic control systems typically employ conventional electro-hydraulic multi-way directional valves. High-flow hydraulic systems provide pilot oil to their own directional valves, inevitably resulting in significant pilot power loss, wasted component flow capacity, and large size and weight. In other words, the hydraulic control system cannot rationally match flow and pressure for different operating states, leading to high energy consumption. Therefore, to address these problems, this invention provides a hydraulic control system for garbage trucks, 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, as Figure 1 As shown, the oil tank assembly 10 can store the hydraulic oil required by the hydraulic control system, thereby enabling the hydraulic control system to operate normally and process waste.

[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 connected to the oil inlet P1 of the first hydraulic assembly 30, and the second oil outlet 23 may be connected to the oil inlet of the second hydraulic assembly 40. The oil outlets T1 of the first hydraulic assembly 30 and T2 of the second hydraulic assembly 40 may be connected to 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, driven by an engine or motor through a power take-off or coupling, to draw hydraulic oil from the oil tank assembly 10 from 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 that of the second oil outlet 23. This allows for the supply of oil to either the first oil outlet 22 or the second oil outlet 23, based on the different execution requirements of the garbage truck dumping garbage, the scraper opening or closing, the slide plate moving up or down, the loader lifting or locking, and the pusher pushing or retracting. This effectively matches the flow rate and pressure distribution of the hydraulic oil and reduces the energy consumption of the hydraulic control system.

[0030] The first hydraulic assembly 30 may include a first directional valve 31 and a first cylinder 32. The first directional valve 31 is detachably connected to the first outlet 22, the oil tank assembly 10, and the first cylinder 32. The first directional valve 31 can control the connection and disconnection between the first cylinder 32 and the first outlet 22 and the oil tank assembly 10. The first directional valve 31 is an electro-hydraulic pilot directional valve. By controlling the flow direction and pressure of the pilot hydraulic oil, the working position of the valve core of the first directional valve 31 is changed. When the first directional valve 31 controls the first cylinder 32 to be connected to the first outlet 22 and the oil tank assembly 10, the hydraulic oil supplied by the first outlet 22 can be supplied to the first cylinder 32 through the first directional valve 31 and finally flow back to the oil tank assembly 10 through the first directional valve 31. By changing the flow direction of the hydraulic oil through the first cylinder 32, the extension or retraction of the first cylinder 32 can be controlled. When the first directional valve 31 controls the first cylinder 32 to disconnect from the first outlet 22 and the oil tank assembly 10 respectively, the hydraulic oil supplied by the first outlet 22 can directly flow back to the oil tank assembly 10 through the first directional valve 31 without passing through the first cylinder 32. At this time, the first cylinder 32 has no output. The first hydraulic assembly 30 requires a large flow rate and high power during the waste recycling process, so the oil flow rate of the first outlet 22 can be greater than that of the second outlet 23, thus enabling the first hydraulic assembly 30 to be a high-flow-rate control system. This allows the high-flow-rate first hydraulic control assembly to control multiple first cylinders 32 to output actuation. Using a high-flow-rate hydraulic control system to control actuating components with large flow rates and high power can improve execution efficiency.

[0031] The second hydraulic assembly 40 may include a second directional valve 41 and a second cylinder 42. The second directional valve 41 is detachably connected to the second oil outlet 23, the oil tank assembly 10, and the second cylinder 42, respectively. The second directional valve 41 controls the on / off connection between the second cylinder 42 and the second oil outlet 23 and the oil tank assembly 10, respectively. When the second cylinder 42 of the second hydraulic assembly 40 is not actuated, the hydraulic oil in the second oil outlet 23 can flow back to the oil tank assembly 10 through the pilot assembly 50, without flowing through the second cylinder 42. When the second cylinder 42 of the second hydraulic assembly 40 is actuated, the hydraulic oil in the second oil outlet 23 can flow through the second directional valve 41, enter the second cylinder 42, and then flow back to the oil tank assembly 10. During the waste recycling process, the second hydraulic assembly 40 uses a relatively small flow rate and low power. Since the oil flow rate of the first oil outlet 22 is greater than that of the second oil outlet 23, the second hydraulic assembly 40 can be controlled for a small flow rate. Using a low-flow-rate hydraulic control system to control actions with smaller flow rates and lower power 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 inlet of the pressure reducing valve 51 is detachably connected to the second outlet 23. The outlet of the pressure reducing valve 51 is detachably connected to the pilot control ports of the oil tank assembly 10 and the first directional valve 31, respectively. The outlet of the pressure reducing valve 51 switches between the oil tank assembly 10 and the pilot control port of the first directional valve 31. The inlet of the back pressure valve 52 is detachably connected to the outlet of the second directional valve 41. The outlet of the back pressure valve 52 is detachably connected to the oil tank assembly 10. The second directional valve 41 can control the second outlet 23 to switch between the second cylinder 42 and the back pressure valve 52. The first directional valve 31, which controls high flow rate, is controlled by a pilot oil source, and the pilot oil source has the same oil supply line as the second hydraulic assembly 40, which controls low flow rate. That is, the pilot component 50 is set in the second hydraulic component 40 with low flow control. When the first hydraulic component 30 has no output, the flow and pressure of the second hydraulic component 40 are small. Therefore, when the hydraulic oil flows back to the oil tank component 10 through the pressure reducing valve 51, the flow loss of the hydraulic oil is small, thereby achieving the effect of reducing energy consumption. When the second hydraulic component 40 has no output and the first hydraulic component 30 has an output, a portion of the hydraulic oil from the second outlet 23 flows through the pressure reducing valve 51 to the first directional valve 31, providing the first directional valve 31 with the hydraulic oil required for directional switching. This allows the hydraulic oil from the first outlet 22 to flow through the first directional valve 31, providing hydraulic oil to the first cylinder 32, so that the first hydraulic component 30 has a corresponding output. Another portion of the hydraulic oil from the second outlet 23 flows back from the back pressure valve 52 to the oil tank assembly 10. Compared to the design where the back pressure valve 52 is located in the first hydraulic assembly 30 with high flow control, this design places the back pressure valve 52 in the second hydraulic assembly 40 with low flow control, significantly reducing the power loss flowing through the back pressure valve 52. This reduces the energy consumption of the hydraulic control system, and since a high-specification model of the back pressure valve 52 is not required, its weight, size, and cost can be greatly reduced.

[0033] In some embodiments, such as Figure 1 As shown, a first safety valve 34 can be installed in the first hydraulic assembly 30, and a second safety valve 44 can be installed 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 the closed state, and the hydraulic control system operates normally. 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 some 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 rises, thereby keeping the pressure of the hydraulic control system within the set range and preventing excessive pressure in the hydraulic control system from causing safety hazards.

[0034] In this embodiment, as Figure 2 , Figure 3 As shown, there can be multiple first directional valves 31 and multiple first cylinders 32, with the multiple first directional valves 31 arranged sequentially along a preset direction. Each first directional valve 31 can correspond to at least one first cylinder 32. The first directional valve 31 can be a three-position six-way valve, and the first directional valve 31 can have a first working position, a second working position, and a third working position. The first directional valve 31 has a first port 311, a second port 312, a third port 313, a fourth port 314, a fifth port 315, and a sixth port 316. When the first directional valve 31 is in the first working position and the third working position, the first cylinder 32 is connected to the first oil outlet 22 and the oil tank assembly 10, respectively. That is, when the first directional valve 31 is in the first working position, the first port 311 is connected to the first oil outlet 22, the fourth port 314 is connected to the first cylinder 32, and the first port 311 is connected to the fourth port 314. The second port 312 is disconnected from the fifth port 315. The third interface 313 is connected to the oil tank assembly 10, and the sixth interface 316 is connected to the first oil cylinder 32. The third interface 313 is connected to the sixth interface 316. The first oil cylinder 32 corresponding to the first working position and the third working position moves in opposite directions. At this time, the first hydraulic assembly 30 is in the running state.

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

[0036] In this embodiment, as Figure 1As shown, the plurality of first hydraulic cylinders 32 include at least a sliding plate cylinder 321 and a scraper cylinder 322. The sliding plate cylinder 321 can be connected to the first hydraulic assembly 30. The scraper cylinder 322 can also be connected to the first hydraulic assembly 30. When hydraulic oil flows from the first directional valve 31 into the sliding plate cylinder 321, the sliding plate of the garbage truck can move. When hydraulic oil flows from the first directional valve 31 into the scraper cylinder 322, the scraper can rotate at a certain angle. The cooperation between the sliding plate cylinder 321 and the scraper cylinder 322 compresses the garbage into the garbage bin of the vehicle, thus achieving garbage compression. The sliding plate cylinder 321 and the scraper cylinder 322 require large flow rates and high power; connecting them to the first hydraulic assembly 30 with high flow control improves the efficiency of garbage compression operations.

[0037] In this embodiment, as Figure 1 As shown, the multiple first hydraulic cylinders 32 may also include a pusher cylinder 323. The pusher cylinder 323 can be connected to the first hydraulic assembly 30. The pusher can compress or push out the garbage in the garbage bin of the vehicle, increasing the garbage loading capacity and improving the transportation efficiency of the garbage truck. That is, each time the garbage is scraped into the garbage bin by the scraper, the pusher cylinder 323 will be compressed, and when it arrives at the garbage treatment plant, the garbage in the garbage bin needs to be pushed out. Therefore, the pusher cylinder 323 requires a large flow rate and a large power. It can be connected to the first hydraulic assembly 30 with high flow control, thereby improving the efficiency of garbage recycling operations.

[0038] In this embodiment, as 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 sliding plate cylinder 321, scraper cylinder 322, and pusher cylinder 323 in the multiple first cylinders 32 increase sequentially. The oil supply distance is the oil delivery distance from the first oil outlet 22 to the oil inlet of the first reversing valve 31. Thus, within a limited space, the oil supply path of the sliding plate cylinder 321 is reduced sequentially according to the frequency of the actuation of the moving elements, with priority given to reducing the oil supply path of the sliding plate cylinder 321, followed by reducing the oil supply path of the scraper cylinder 322, thereby reducing the flow loss of the hydraulic control system.

[0039] In this embodiment, as Figure 1As shown, there can be multiple second directional valves 41 and multiple second cylinders 42, with the multiple second directional valves 41 arranged sequentially along a preset direction. Each second directional valve 41 can correspond to at least one second cylinder 42. The second directional valve 41 has a similar structure to the first directional valve 31. The second directional valve 41 can also be a three-position six-way valve. The first directional valve 31 is an electro-hydraulic pilot directional valve, and the second directional valve 41 is a solenoid directional valve or an electro-hydraulic pilot directional valve. The second directional valve 41 also has a first working position, a second working position, and a third working position. When the second directional valve 41 is in the first working position or the third working position, the second directional valve 41 is connected to the second oil outlet 23 and the oil tank assembly 10. At this time, the second cylinder 42 of the second hydraulic assembly 40 has an actuation output. When the second directional valve 41 is in the first working position, its sixth port 316 is connected to the second oil inlet 21, its third port 313 is connected to the second cylinder 42, and its third port 313 is connected to the sixth port 316. The first port 311 of the second directional valve 41 is connected to the second cylinder 42, and its fourth port 314 is connected to the oil tank assembly 10. The second port 312 of the second directional valve 41 is disconnected from the fifth port 315. The actions of the second cylinder 42 corresponding to the first and third working positions of the second directional valve 41 are opposite. When the second directional valve 41 is in the second working position, the second cylinder 42 is disconnected from the second oil outlet 23 and the oil tank assembly 10, and multiple second directional valves 41 are connected in series. That is, when the second directional valve 41 is in the second working position, the third port 313 and the fourth port 314 of the second directional valve 41 are disconnected, the first port 311 and the sixth port 316 of the second directional valve 41 are disconnected, the second port 312 of the second directional valve 41 is connected to the back pressure valve 52, the fifth port 315 of the second directional valve 41 is connected to the second oil inlet 21, and the second port 312 and the fifth port 315 of the second directional valve 41 are connected. Furthermore, when there are multiple second directional valves 41, the fifth port 315 of the first second directional valve 41 is connected to the second port 312 of the last second directional valve 41. Depending on different flow requirements, the second directional valve can be selected as a solenoid directional valve or a small-flow electro-hydraulic pilot directional valve, thus achieving good economy and low cost.

[0040] In this embodiment, as Figure 1As shown, the multiple second cylinders 42 may include at least a lifting cylinder 421, a locking cylinder 422, and a feeding cylinder 423. The lifting cylinder 421 and locking cylinder 422 are connected in parallel and share a second directional valve 41. When the garbage truck arrives at the waste treatment plant, the locking cylinder 422 opens, disengaging the mechanical connection of the garbage container's loader. Then, the lifting cylinder 421 can lift the garbage truck's loader, and the pusher cylinder 323 pushes the garbage out of the container. Subsequently, the lifting cylinder 421 closes the loader. Then, the locking cylinder 422 locks the garbage truck's container and loader to prevent leakage of garbage during compression and transportation. The feeding cylinder 423, when collecting garbage, can lift the household garbage bin and dump the garbage into the vehicle's hopper. Since the lifting cylinder 421, locking cylinder 422 and loading cylinder 423 have low working flow and low power, connecting them with the second hydraulic component 40 with low flow control can effectively reduce the energy consumption of the hydraulic control system.

[0041] In some embodiments, the communication positions of the lifting cylinder 421, locking cylinder 422, loading cylinder 423, sliding plate cylinder 321, scraper cylinder 322, and pusher cylinder 323 can be adjusted. For example, the loading cylinder 423 can be adjusted to be in 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, as Figure 1 As shown, the first hydraulic assembly 30 may further include a first unloading valve 33, the inlet of which is detachably connected to the first outlet 22. The 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 an off position. When the first cylinder 32 of the first hydraulic assembly 30 does not output any action, the first unloading valve 33 is in the on position, which shortens the distance between the first outlet 22 and the oil tank assembly 10, thereby shortening the return oil distance and reducing the energy consumption of the hydraulic control system.

[0043] In this embodiment, as Figure 2 As shown, the second hydraulic assembly 40 may further include a second unloading valve 43, the inlet of which is detachably connected to the second outlet 23. The 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 be two-position three-way valves. As long as the first unloading valve 33 or the second unloading valve 43 has one off position and one on position, the second unloading valve 43 can effectively reduce the power loss of the hydraulic control system in standby mode, thus achieving energy saving.

[0044] When the first hydraulic assembly 30 and the second hydraulic assembly 40 are not operating, the hydraulic oil from the first outlet 22 returns to the tank assembly 10 through the open position of the first unloading valve 33. A portion of the hydraulic oil from the second outlet 23 can flow directly into the tank assembly 10 through the open position of the second unloading valve 43, while another portion flows into the tank assembly 10 through the pressure reducing valve 51, with minimal flow loss. The second unloading valve 43 prevents the hydraulic oil in the second hydraulic assembly 40 from flowing back to the tank assembly 10 through the back pressure valve 52, thereby reducing energy consumption in the hydraulic control system.

[0045] When the first cylinder 32 of the first hydraulic assembly 30 has an actuation output, and the second cylinder 42 of the second hydraulic assembly 40 does not have an actuation output, the second unloading valve 43 is in the cut-off position. A portion of the hydraulic oil from the second outlet 23 is transferred from the pressure reducing valve 51 to the first directional valve 31, causing the first directional valve 31 to be in a suitable working position. This allows the hydraulic oil from the first outlet 22 to flow through the first directional valve 31 and enter the first cylinder 32, resulting in a corresponding actuation output from the first hydraulic assembly 30. The remaining hydraulic oil flows from the outlet of the back pressure valve 52 into the oil tank assembly 10. Because the second hydraulic assembly 40 uses low-flow control, and the back pressure valve 52 is located within the second hydraulic assembly 40, the energy loss caused by the back pressure valve 52 is relatively small, thereby reducing the flow loss of the hydraulic oil flowing through the back pressure valve 52.

[0046] When the first cylinder 32 of the first hydraulic assembly 30 has no output, and the second cylinder 42 of the second hydraulic assembly 40 has an output, the first unloading valve 33 is in the open position, and the hydraulic oil from the first outlet 22 flows back to the tank assembly through the first unloading valve 33. The second unloading valve 43 is in the closed position, ensuring sufficient hydraulic oil pressure in the second hydraulic assembly 40. A portion of the hydraulic oil flows into the second cylinder 42, causing it to operate, and flows from the outlet of the second hydraulic assembly 40 into the tank assembly 10. The remaining hydraulic oil flows directly into the tank assembly 10 from the pressure reducing valve 51, without switching the first directional valve 31. Because the second hydraulic assembly 40 uses low-flow control, the flow loss through the pressure reducing valve 51 is small, thereby reducing the energy consumption of the hydraulic control system.

[0047] When the first hydraulic assembly 30 and the second hydraulic assembly 40 simultaneously generate outputs, the first unloading valve 33 and the second unloading valve 43 are in the shut-off position. Hydraulic oil from the first outlet 22 flows through the first directional valve 31 and into the first cylinder 32, causing the first hydraulic assembly 30 to generate a corresponding output. A portion of the hydraulic oil from the second inlet 21 flows into the second cylinder 42, causing it to operate, and then flows from the outlet of the second hydraulic assembly 40 into the oil tank assembly 10, causing the second hydraulic assembly 40 to generate a corresponding output. Another portion of the hydraulic oil flows from the pressure reducing valve 51 to the first directional valve 31, providing it with directional power. This eliminates excess flow consumption, thereby reducing the energy consumption of the hydraulic control system.

[0048] In this embodiment, as 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 of the proportional relief valve 45 is detachably connected to the second oil outlet 23. The oil outlet 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 loading 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 loading cylinder 423 circuit according to the feedback of the loading sensor. That is, when the loading cylinder 423 extends to work, the garbage in the household garbage bin is initially full. The household garbage bin is the garbage bin commonly used by residents in their daily lives. Therefore, the load of the loading cylinder 423 is relatively large, and the proportional relief valve 45 initially outputs the maximum set value of the allowable working range. As the parameters of the loading weighing system and the lifting angle of the household garbage bin change, the garbage in the household garbage bin is gradually poured into the garbage truck, and the load of the loading cylinder 423 gradually decreases. Therefore, the output pressure of the proportional pressure reducing valve 51 gradually decreases. When the lifting angle reaches its maximum, the garbage in the household trash can is emptied. At this point, the output pressure of the proportional pressure reducing valve 51 is at its minimum, which is the pressure value that allows the loading cylinder 423 to retract. During this operation, no overflow loss occurs, and when the action is complete, the overflow loss is far lower than that of the safety valve, achieving energy saving. When the loading cylinder 423 retracts, the output pressure of the proportional relief valve 45 remains constant. During this operation, no overflow loss occurs, and when the action is complete, the overflow loss is far lower than that of the safety valve, thus achieving energy saving.

[0049] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A hydraulic control system for garbage trucks, characterized in that, The hydraulic control system of the garbage truck includes: Fuel tank assembly; An oil pump assembly has 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 includes a first directional valve and a first hydraulic cylinder; the first directional valve is detachably connected to the first oil outlet, the oil tank assembly, and the first hydraulic cylinder; the first directional valve controls the on / off connection between the first hydraulic cylinder and the first oil outlet and the oil tank assembly; the first directional valve is an electro-hydraulic pilot directional valve. The second hydraulic assembly includes a second directional valve and a second cylinder; the second directional valve is detachably connected to the second oil outlet, the oil tank assembly, and the second cylinder; the second directional valve controls the connection and disconnection between the second cylinder and the second oil outlet and the oil tank assembly. A pilot assembly includes a pressure reducing valve and a back pressure valve; the inlet of the pressure reducing valve is detachably connected to the second outlet; the outlet of the pressure reducing valve is detachably connected to the oil tank assembly and the pilot control port of the first directional valve; the outlet of the pressure reducing valve switches between the oil tank assembly and the pilot control port of the first directional valve; the inlet of the back pressure valve is detachably connected to the outlet of the second directional valve; the outlet of the back pressure valve is detachably connected to the oil tank assembly; the second directional valve controls the second outlet to switch between the second cylinder and the back pressure valve.

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

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

4. A hydraulic control system for a garbage truck according to claim 3, characterized in that, The plurality of first cylinders also include a pusher cylinder.

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

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

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

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

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

10. A hydraulic control system for a garbage truck according to claim 9, characterized in that, The hydraulic control system of the garbage truck also includes a proportional overflow valve and a loading sensor; the oil inlet of the proportional overflow valve is detachably connected to the second oil outlet; the oil outlet 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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