Hydraulic control system for compression garbage truck and compression garbage truck

Abstract

The application belongs to the technical field of garbage treatment equipment and provides a hydraulic control system for a compression garbage truck and the compression garbage truck, the system comprising a pumping unit, a multi-way valve group, a first oil supply oil path, a second oil supply oil path, the multi-way valve group comprising a first multi-way valve, a second multi-way valve and a split-flow control valve, the first multi-way valve comprising a first neutral passage with neutral oil return, the second multi-way valve comprising a second neutral passage with neutral oil return, the first oil supply oil path being connected between the first oil pump and the first multi-way valve, the second oil supply oil path being connected between the second oil pump and the second multi-way valve, and the split-flow control valve being used for controlling the first oil supply oil path and the second oil supply oil path to split flow or to combine flow. Through the above setting, the number of valves through which hydraulic oil flows can be effectively reduced when combining flow, and the flow loss and energy consumption of hydraulic oil when flowing in the system can be reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of waste treatment equipment, specifically relating to a hydraulic control system for a compactor garbage truck and the compactor garbage truck itself. Background Technology

[0002] Batteries are one of the most important cost items for new energy compactor garbage trucks. The battery capacity must meet the requirements of driving range and superstructure operation. If the superstructure operation consumes too much energy, it will not be conducive to energy conservation and emission reduction, and will affect the driving range of the whole vehicle. Alternatively, it may require a larger battery capacity, which will increase the cost of the whole vehicle. Therefore, it is necessary to study the hydraulic energy-saving technology of compactor garbage trucks.

[0003] The existing new energy garbage trucks basically use the hydraulic control system and hydraulic control logic of the fuel-fired garbage trucks. The only difference is that the oil pump is driven by a battery and an electric motor instead of an engine. For the existing dual-pump hydraulic control system used in compactor garbage trucks: due to the high idle speed, there is a large cavitation loss between the large and small pumps when idling; when loading alone, the small pump works while the large pump suffers cavitation loss; when the large and small pumps are combined, there is generally a problem of large pipeline flow loss; as a result, the energy consumption of the superstructure operation remains high. Summary of the Invention

[0004] To address the aforementioned deficiencies or shortcomings, this invention provides a hydraulic control system for a compactor garbage truck and a compactor garbage truck in general. The aim is to solve the technical problems of high energy consumption caused by idling idling loss, operational idling loss, and large pipeline flow loss when the large and small pumps are combined in the existing dual-pump hydraulic control system for new energy compactor garbage trucks.

[0005] To achieve the above objectives, the present invention provides a hydraulic control system for a compactor garbage truck. The hydraulic control system includes a pumping unit, a multi-way valve group, a first oil supply circuit, and a second oil supply circuit. The pumping unit includes a first oil pump and a second oil pump. The multi-way valve group includes a first multi-way valve for controlling the compaction mechanism, a second multi-way valve for controlling the feeding mechanism, and a flow splitting / combining control valve. The first multi-way valve includes a first neutral return channel, and the second multi-way valve includes a second neutral return channel. The first oil supply circuit is connected between the first oil pump and the first multi-way valve, and the second oil supply circuit is connected between the second oil pump and the second multi-way valve. The flow splitting / combining control valve is an electrically controlled directional valve and includes a first connecting port and a second connecting port. The first connecting port is connected to the first oil supply circuit, and the second connecting port is connected to the second oil supply circuit. By controlling the flow splitting / combining control valve, the first and second connecting ports can be connected or disconnected.

[0006] In an embodiment of the present invention, the first intermediate channel is connected to the second intermediate channel and the connecting oil circuit is provided with a check valve. The check valve is configured to allow hydraulic oil to flow from the second intermediate channel to the first intermediate channel and to cut off the flow in the reverse direction.

[0007] In an embodiment of the present invention, the flow splitting and merging control valve is a two-position three-way reversing valve including a merging valve position and a merging valve position. The flow splitting and merging control valve is also provided with a third connecting oil port that communicates with the first intermediate position channel. When switching to the merging valve position, the first connecting oil port communicates with the second connecting oil port and the third connecting oil port is closed. When switching to the merging valve position, the first connecting oil port communicates with the third connecting oil port and the second connecting oil port is closed.

[0008] In an embodiment of the present invention, the second main oil inlet of the second multi-way valve is connected to the second oil supply circuit and the second neutral channel.

[0009] In an embodiment of the present invention, the compaction mechanism includes a scraper cylinder, a sliding plate cylinder, and a pusher cylinder. The first multi-way valve includes a first reversing link, a second reversing link, and a third reversing link for controlling the scraper cylinder, the sliding plate cylinder, and the pusher cylinder, respectively. The feeding mechanism includes a drum tilting cylinder, a lifting cylinder, and a locking cylinder. The second multi-way valve includes a fourth reversing link, a fifth reversing link, and a sixth reversing link for controlling the drum tilting cylinder, the lifting cylinder, and the locking cylinder, respectively.

[0010] In embodiments of the present invention, the pumping unit further includes a pumping drive motor for driving the first oil pump and the second oil pump. The pumping drive motor has a low-speed operating state, a medium-speed operating state, and a high-speed operating state. The hydraulic control system includes a controller, which is configured to: In response to the feeding operation signal, the pump drive motor is controlled to operate at medium speed, and the flow splitting and merging control valve is switched to the merging valve position.

[0011] In embodiments of the present invention, the controller is further configured to: In response to the compaction operation signal, the pump drive motor is controlled to operate at high speed according to the compaction operation signal, and the flow separation and merging control valve is controlled to switch to the merging valve position.

[0012] In embodiments of the present invention, the controller is further configured to: In response to the simultaneous feeding and compaction operation signal, the pump drive motor is controlled to operate at high speed according to the simultaneous feeding and compaction operation signal, and the flow diversion and merging control valve is switched to the flow diversion valve position.

[0013] In embodiments of the present invention, the controller is further configured to: In response to the idle signal, the pump drive motor is controlled to operate at low speed, and the flow control valve is switched to the flow divider position.

[0014] Control the pump drive motor to operate at low speed, and control the flow splitting and merging control valve to switch to the flow splitting valve position.

[0015] In embodiments of the present invention, the hydraulic control system further includes a pressure sensor for monitoring the pressure at the first main inlet of the first multi-way valve and / or the second main inlet of the second multi-way valve. The pressure sensor is configured to issue a deceleration signal when the oil pressure in the sensed pipeline exceeds a preset value. The controller is further configured to: In response to a speed reduction signal, the pump drive motor is controlled to reduce its speed according to the speed reduction signal.

[0016] To achieve the above objectives, embodiments of the present invention also provide a compressed garbage truck, wherein the compressed garbage truck includes a hydraulic control system for a compressed garbage truck as described above.

[0017] Through the above technical solution, the hydraulic control system for a compressed garbage truck provided in this embodiment of the invention has the following beneficial effects: The flow splitting and merging control valve can be controlled by the controller to realize the flow splitting and merging control of the first oil supply circuit and the second oil supply circuit. Merging means that the first connecting oil port and the second connecting oil port are connected through the first connecting oil port and the second connecting oil port. Dividing means that the first connecting oil port and the second connecting oil port are disconnected. In the hydraulic control system of the present invention, when the first oil supply circuit and the second oil supply circuit merge, the hydraulic oil in the first oil supply circuit only needs to flow through one flow splitting and merging control valve to merge with the second oil supply circuit, or the hydraulic oil in the second oil supply circuit only needs to flow through one flow splitting and merging control valve to merge with the first oil supply circuit. By merging the oil supply lines, the number of valves through which the hydraulic oil flows is reduced, effectively decreasing the flow loss of the hydraulic oil. Furthermore, the first and second oil supply lines in this system can merge bidirectionally, allowing the second pump to support the first pump, and vice versa, thus increasing the flexibility of the system's power distribution. Moreover, the merging and splitting control valves eliminate the need for check valves on the merging lines, avoiding flow loss due to check valve back pressure. In summary, these features effectively reduce the flow loss of hydraulic oil in the hydraulic control system, thereby reducing the energy consumption of the hydraulic control system.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a first embodiment of a hydraulic control system for a compactor garbage truck according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a second embodiment of the hydraulic control system for a compactor garbage truck according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the first structural form of the flow splitting and merging control valve according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a second structural form of the flow splitting and merging control valve according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] The hydraulic control system for a compactor garbage truck of the present invention is described below with reference to the accompanying drawings.

[0023] This invention provides a hydraulic control system for a compactor garbage truck, such as... Figure 1 and Figure 2 As shown, the hydraulic control system for a compactor garbage truck includes: Pumping unit 1 includes a first oil pump 11 and a second oil pump 12; The multi-way valve group includes a first multi-way valve 21 for controlling the compaction mechanism 6, a second multi-way valve 22 for controlling the feeding mechanism 7, and a flow splitting and merging control valve 23. The first multi-way valve 21 includes a first neutral channel 211 for neutral return oil, and the second multi-way valve 22 includes a second neutral channel 221 for neutral return oil. The first oil supply circuit 3 is connected between the first oil pump 11 and the first multi-way valve 21; The second oil supply line 4 is connected between the second oil pump 12 and the second multi-way valve 22; The flow splitting and merging control valve 23 is an electrically controlled directional valve and includes a first connecting port 231 and a second connecting port 232. The first connecting port 231 is connected to the first oil supply circuit 3, and the second connecting port 232 is connected to the second oil supply circuit 4. By controlling the flow splitting and merging control valve 23, the first connecting port 231 and the second connecting port 232 can be connected or cut off.

[0024] The flow splitting and merging control valve 23 can be controlled by the controller to realize the flow splitting and merging control of the first oil supply circuit 3 and the second oil supply circuit 4. Merging means that the first connecting port 231 and the second connecting port 232 are connected through the first connecting port 231 and the second connecting port 232. Dividing means that the first connecting port 231 and the second connecting port 232 are disconnected. In the hydraulic control system of this embodiment, when the first oil supply circuit 3 and the second oil supply circuit 4 merge, the hydraulic oil in the first oil supply circuit 3 only needs to flow through one flow splitting and merging control valve 23 to merge with the second oil supply circuit 4, or the hydraulic oil in the second oil supply circuit 4 only needs to flow through one flow splitting and merging control valve 23. The control valve 23 merges with the first oil supply line 3, reducing the number of valves through which the hydraulic oil flows and thus effectively reducing the flow loss of the hydraulic oil. At the same time, the first oil supply line 3 and the second oil supply line 4 in this system can merge bidirectionally, and the second oil pump 12 can support the first oil pump 11, and the first oil pump 11 can also support the second oil pump 12, thereby increasing the flexibility of the system's power distribution. Furthermore, the setting of the merging and splitting control valve 23 eliminates the need to install a check valve 5 on the merging pipeline, thus avoiding the flow loss caused by the back pressure of the check valve 5. In summary, through the above settings, the flow loss of hydraulic oil when flowing in the hydraulic control system can be effectively reduced, and the energy consumption of the hydraulic control system can be reduced.

[0025] like Figure 1 As shown, it should be explained that the neutral oil return in the first neutral channel 211 and the second neutral channel 221 refers to the fact that when the first multi-way valve 21 and the second multi-way valve 22 are in the return valve position (neutral), the oil pumped by the first oil pump 11 and the second oil pump 12 can directly flow back to the return oil pipeline through the first neutral channel 211 and the second neutral channel 221. To achieve neutral oil return, there are various connection methods for the first neutral channel 211 and the second neutral channel 221, such as in this embodiment. Figure 1 Similarly, the first end of the first intermediate channel 211 is connected to the first oil supply line 3 via the third connecting port 233 and the first connecting port 231 of the flow control valve 23, and the tail end of the first intermediate channel 211 is connected to the return oil line. In addition, the first end of the second intermediate channel 221 can also be directly connected to the second oil supply line 4. The first oil supply line 3 connecting the first oil pump 11 and the first multi-way valve 21 means that the first oil supply line 3 connects the outlet of the first oil pump 11 and the first main inlet port 215 of the first multi-way valve 21. Likewise, the second oil supply line 4 connecting the second oil pump 12 and the second multi-way valve 22 means that the second oil supply line 4 connects the outlet of the second oil pump 12 and the second main inlet port 225 of the second multi-way valve 22.

[0026] like Figure 1 and Figure 3As shown, in a preferred embodiment of the present invention, the first end of the first intermediate channel 211 is connected to the first oil supply circuit 3 through the third and first oil ports of the flow control valve 23; the first end of the second intermediate channel 221 is connected to the second oil supply circuit 4; the end of the second intermediate channel 221 is connected to the first end of the first intermediate channel 211; and the end of the first intermediate channel 211 is connected to the return oil line. A one-way valve 5 is also provided on the connecting oil line between the first end of the first intermediate channel 211 and the end of the second intermediate channel 221. The one-way valve 5 is configured to allow hydraulic oil to flow from the second intermediate channel 221 to the first intermediate channel 211 and to cut off the flow in the reverse direction. The one-way valve 5 ensures that the hydraulic oil in the first oil supply circuit 3 cannot flow backwards to the second intermediate channel 221 through the first connecting oil port 231 and the third connecting oil port 233, while ensuring that the second intermediate channel 221 forms a certain pressure for the electro-hydraulic reversing control of the multi-way valve.

[0027] like Figure 1 and Figure 3 As shown, in an embodiment of the present invention, the flow splitting and merging control valve 23 can be a two-position three-way reversing valve including a merging valve position and a merging valve position. The flow splitting and merging control valve is also provided with a third connecting oil port that communicates with the first neutral position channel. When switching to the merging valve position, the first connecting oil port 231 is connected to the second connecting oil port 232 and the third connecting oil port 233 is closed. When switching to the merging valve position, the first connecting oil port 231 is connected to the third connecting oil port 233 and the second connecting oil port 232 is closed.

[0028] like Figure 2 and Figure 4As shown, in another embodiment of the present invention, the flow splitting and merging control valve 23 can also be a two-position four-way valve and includes a first connecting port 231, a second connecting port 232, a third connecting port 233, and a fourth connecting port. When the flow splitting and merging control valve 23 is a two-position four-way valve, the connection form of the first multi-way valve 21 and the second multi-way valve 22 needs to be adjusted. Specifically, one connection form of the first multi-way valve and the second multi-way valve can be: the first end of the first intermediate channel 211 of the first multi-way valve and the first main inlet port 215 are both connected to the first oil supply line 3; the first end of the second intermediate channel 221 of the second multi-way valve and the second main inlet port 225 are both connected to the second oil supply line 4; the end of the first intermediate channel 211, the end of the second intermediate channel 221, and the fourth connecting port 234 are connected; the first oil supply line 3 is also connected to the first connecting port 231; the second oil supply line 4 is also connected to the second connecting port 232; and the third connecting port 233 is connected to the return oil line. When the first connecting port 231 and the second connecting port 232 are connected, the first oil supply line 3 and the second oil supply line 4 are connected and merged. When the third connecting port 233 and the fourth connecting port are connected, the first neutral channel 211 and the second neutral channel 221 are connected to the return oil pipeline through the third connecting port 233 and the fourth connecting port. This connection form can also realize the flow splitting and merging control function and can reduce flow loss. Of course, the flow splitting and merging control valve 23 can also adopt other forms, and the first neutral channel 211 and the second neutral channel 221 can be directly connected to the return oil pipeline.

[0029] like Figure 1 As shown, in an embodiment of the present invention, the second main oil inlet 225 of the second multi-way valve 22 is connected to the second oil supply line 4 and the second neutral channel 221.

[0030] like Figure 1 As shown, in an embodiment of the present invention, the compaction mechanism 6 includes a scraper cylinder 61, a sliding plate cylinder 62, and a pusher cylinder 63. The first multi-way valve 21 includes a first reversing link 212, a second reversing link 213, and a third reversing link 214 for controlling the scraper cylinder 61, the sliding plate cylinder 62, and the pusher cylinder 63 respectively. The feeding mechanism 7 includes a drum tilting cylinder 71, a lifting cylinder 72, and a locking cylinder 73. The second multi-way valve 22 includes a fourth reversing link 222, a fifth reversing link 223, and a sixth reversing link 224 for controlling the drum tilting cylinder 71, the lifting cylinder 72, and the locking cylinder 73 respectively.

[0031] like Figure 1As shown, the compaction mechanism 6 mainly achieves four actions—scraper opening, slide downward movement, scraper closing, and slide upward movement—through the drive of the scraper cylinder and the slide cylinder 62. Similarly, the feeding mechanism 7 achieves the tilting action of the garbage bin and the locking and lifting actions of the compactor through the drive of the tipping cylinder 71, the lifting cylinder 72, and the locking cylinder 73. By corresponding the reversing couplings with the cylinders one by one, control is convenient. Of course, as... Figure 2 As shown, in order to simplify the system, for some cylinders that appear in pairs or need to act simultaneously, two or more cylinders can be controlled by a reversing coupling.

[0032] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the pumping unit 1 further includes a pumping drive motor 13 for driving the first oil pump 11 and the second oil pump 12. The pumping drive motor 13 has a low-speed operating state, a medium-speed operating state, and a high-speed operating state. The hydraulic control system includes a controller, which is configured to: In response to the feeding operation signal, the pump drive motor 13 is controlled to operate at medium speed, and the flow splitting and merging control valve 23 is controlled to switch to the merging valve position.

[0033] The hydraulic control system in this embodiment is mainly applied to new energy garbage trucks, so the drive method is motor drive. The typical speed of the low-speed operation is 0-50 r / min, the typical speed of the medium-speed operation is about 400 r / min, and the typical speed of the high-speed operation is 1500 r / min. Of course, the high-speed, medium-speed, and low-speed mentioned above can also be other speeds. The feeding operation signal is generated after the feeding button is pressed manually. After receiving the feeding operation signal, the controller will control the second multi-way valve to operate according to the preset timing sequence. The controller will also control the motor to operate in the medium-speed operation state and control the flow control valve 23 to switch to the flow control position. Under this control, the two oil pumps will supply oil to the feeding mechanism 7 together, so that the motor operates at a lower speed while ensuring that the power source of the feeding mechanism 7 is sufficient, avoiding the idling loss of the first oil pump 11 and reducing the energy consumption of the motor.

[0034] In embodiments of the present invention, the controller is further configured to: In response to the compaction operation signal, the pump drive motor 13 is controlled to operate at high speed according to the compaction operation signal, and the merging and diverging control valve 23 is controlled to switch to the merging valve position.

[0035] The compaction operation signal is generated when the single compaction button or the cyclic compaction button is pressed manually. The compaction mechanism 6 requires a large driving flow when compacting the waste, so the motor needs to run at high speed. At the same time, in order to further increase the driving flow of the compaction mechanism 6, the flow control valve 23 can be switched to the flow merging valve position. At this time, the oil pumped by the first oil pump 11 and the second oil pump 12 will flow to the compaction mechanism 6, thereby avoiding the oil pumped by the second oil pump 12 from flowing in vain and increasing the system energy utilization efficiency.

[0036] In embodiments of the present invention, the controller is further configured to: In response to the simultaneous feeding and compaction operation signal, the pump drive motor 13 is controlled to operate at high speed according to the simultaneous feeding and compaction operation signal, and the flow diversion and merging control valve 23 is controlled to switch to the flow diversion valve position.

[0037] The simultaneous feeding and compaction operation signal refers to the signal generated when the system receives a feeding operation signal or a compaction operation signal during the compaction operation. This signal indicates that the compaction mechanism 6 and the feeding mechanism 7 need to operate simultaneously. In this case, the pump drive motor 13 needs to maintain high-speed operation to ensure the power of the actuator. By controlling the flow diversion and merging control valve 23 to switch to the flow diversion valve position, it can be ensured that the first oil supply circuit 3 and the second oil supply circuit 4 do not interfere with each other, so that the operating speeds of the compaction mechanism 6 and the feeding mechanism 7 do not interfere with each other.

[0038] It should be noted that in a dual-pump hydraulic drive system, the power of the first oil pump 11 is usually greater than that of the second oil pump 12.

[0039] In embodiments of the present invention, the controller is further configured to: In response to an idle signal, the pump drive motor 13 is controlled to operate in the low-speed operation state, and the flow control valve 23 is controlled to switch to the flow divider position.

[0040] The idle signal is automatically generated when the controller does not receive the feeding operation signal, compaction operation signal, or simultaneous feeding and compaction operation signal. That is, when the operator does not operate the control panel and the compaction mechanism 6 and the feeding mechanism 7 are not working, the idle signal will be automatically generated. At this time, the hydraulic control system has a very low demand for the drive source. If the motor continues to run at high or medium speed, it will cause unnecessary energy loss. This system controls the pump drive motor 13 to run at low speed when it receives the idle signal, thereby reducing unnecessary flow output and energy consumption, and reducing idle operation noise.

[0041] like Figure 1 and Figure 2As shown, in an embodiment of the present invention, the hydraulic control system further includes a pressure sensor 8, which is used to monitor the pressure at the first main inlet 215 of the first multi-way valve 21 and / or the second main inlet 225 of the second multi-way valve 22. The pressure sensor 8 is configured to issue a deceleration signal when the sensed oil pressure in the pipeline exceeds a preset value. The controller is also configured to: In response to the deceleration signal, the pump drive motor 13 is controlled to decelerate according to the deceleration signal.

[0042] Hydraulic circuits typically include relief valves to protect against overload. However, this overflow wastes flow. This system addresses this by incorporating a pressure sensor 8 to reduce motor speed in case of system overpressure or overload, thus preventing large-flow hydraulic oil overflow and reducing unnecessary flow output and energy consumption. Preferably, the pressure threshold at which the pressure sensor 8 sends a speed-reduction signal is lower than the overflow threshold of the relief valve.

[0043] To achieve the above objectives, this invention also provides a compressed garbage truck, which includes the hydraulic control system for compressed garbage trucks described above. In this embodiment, the compressed garbage truck mainly refers to a new energy garbage truck. Since the compressed garbage truck adopts all the technical solutions of the above embodiments, it at least has the beneficial effects brought about by the above embodiments, and will not be repeated here.

[0044] In summary, through the above-described configuration, the hydraulic control system in this embodiment has at least the following advantages: Energy saving: This system can change the operating state of the pump drive motor 13 and control the flow splitting and merging states of the first oil pump 11 and the second oil pump 12 according to different usage scenarios, thereby ensuring the full and rational utilization of energy, reducing unnecessary flow output and energy consumption, improving the overall efficiency of the hydraulic transmission system, and reducing power consumption. At the same time, the hydraulic pipeline is optimized during the flow splitting and merging process, which can reduce the flow loss of hydraulic oil and further realize the full utilization of energy.

[0045] Low noise: During idling and loading operations, the average motor speed and operating noise are reduced, thereby reducing the average noise level.

[0046] Miniaturization: Reduced energy consumption and improved transmission efficiency significantly reduce the heat generated by hydraulic oil, thereby achieving miniaturization of the oil tank, reducing the capacity and weight of the hydraulic oil tank, and reducing the amount of hydraulic oil used.

[0047] Low impact: During feeding or compaction cycles, the motor gradually increases its speed from low to medium or from medium to high speed, and the flow rate changes gradually, thus avoiding sudden changes in flow rate that could impact the actuator.

[0048] Increased redundancy: The dual pumps can be combined or separated. When one pump fails, the other pump can still work normally, ensuring the basic operation of all actuators and increasing the safety margin of the system.

[0049] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0052] Although embodiments of the present invention have been described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic control system for a compressed garbage truck, characterized in that, The hydraulic control system includes: The pumping unit (1) includes a first oil pump (11) and a second oil pump (12) as a tandem pump. The multi-way valve group includes a first multi-way valve (21) for controlling the compaction mechanism (6), a second multi-way valve (22) for controlling the feeding mechanism (7), and a flow splitting and merging control valve (23). The first multi-way valve (21) includes a first mid-position return oil channel (211), and the second multi-way valve (22) includes a second mid-position return oil channel (221). The first oil supply circuit (3) is connected between the first oil pump (11) and the first multi-way valve (21); The second oil supply circuit (4) is connected between the second oil pump (12) and the second multi-way valve (22); The flow splitting and merging control valve (23) is an electrically controlled directional valve and includes a first connection port (231) and a second connection port (232). The first connection port (231) is connected to the first oil supply circuit (3), and the second connection port (232) is connected to the second oil supply circuit (4). By controlling the flow splitting and merging control valve (23), the first connection port (231) and the second connection port (232) can be connected or cut off. The pumping unit (1) further includes a pumping drive motor (13) for driving the first oil pump (11) and the second oil pump (12), and the pumping drive motor (13) has a low-speed operation state, a medium-speed operation state and a high-speed operation state. During a standalone feeding operation, the pumping drive motor (13) operates at medium speed and the flow control valve (23) is in the flow-merging position. During a standalone compaction operation, the pumping drive motor (13) operates at high speed and the flow control valve (23) is in the flow-merging position. When the feeding operation and the compaction operation are carried out simultaneously, the pumping drive motor (13) operates at high speed and the flow control valve (23) is in the flow-dividing position.

2. The hydraulic control system for a compressed garbage truck according to claim 1, characterized in that, The first intermediate channel (211) is connected to the second intermediate channel (221) and the connecting oil circuit is equipped with a check valve (5). The check valve (5) is configured to allow hydraulic oil to flow from the second intermediate channel (221) to the first intermediate channel (211) and to cut off in the reverse direction.

3. The hydraulic control system for a compressed garbage truck according to claim 1, characterized in that, The flow control valve (23) is a two-position three-way directional valve and includes a flow-combining valve position and a flow-dividing valve position. The flow control valve (23) is also provided with a third connection port (233) that communicates with the first intermediate channel (211). When switching to the flow-combining valve position, the first connection port (231) communicates with the second connection port (232) and the third connection port (233) is closed. When switching to the flow-dividing valve position, the first connection port (231) communicates with the third connection port (233) and the second connection port (232) is closed.

4. The hydraulic control system for a compressed garbage truck according to claim 3, characterized in that, The second main oil inlet (225) of the second multi-way valve (22) is connected to the second oil supply circuit (4) and the second intermediate channel (221).

5. The hydraulic control system for a compressed garbage truck according to any one of claims 1 to 4, characterized in that, The compaction mechanism (6) includes a scraper cylinder (61), a sliding plate cylinder (62), and a pusher cylinder (63). The first multi-way valve (21) includes a first reversing link (212), a second reversing link (213), and a third reversing link (214) for controlling the scraper cylinder (61), the sliding plate cylinder (62), and the pusher cylinder (63) respectively. The feeding mechanism (7) includes a bucket tilting cylinder (71), a lifting cylinder (72), and a locking cylinder (73). The second multi-way valve (22) includes a fourth reversing link (222), a fifth reversing link (223), and a sixth reversing link (224) for controlling the bucket tilting cylinder (71), the lifting cylinder (72), and the locking cylinder (73) respectively.

6. The hydraulic control system for a compressed garbage truck according to any one of claims 1 to 4, characterized in that, The hydraulic control system includes a controller, which is configured to: In response to the feeding operation signal, the pump drive motor (13) is controlled to operate in the medium speed operation state according to the feeding operation signal, and the flow splitting and merging control valve (23) is controlled to switch to the merging valve position.

7. The hydraulic control system for a compressed garbage truck according to claim 6, characterized in that, The controller is also configured to: In response to the compaction operation signal, and according to the compaction operation signal, the pump drive motor (13) is controlled to operate in the high-speed operation state, and the merging and splitting control valve (23) is controlled to switch to the merging valve position.

8. The hydraulic control system for a compressed garbage truck according to claim 6, characterized in that, The controller is also configured to: In response to the simultaneous feeding and compaction operation signal, the pumping drive motor (13) is controlled to operate in the high-speed operation state according to the simultaneous feeding and compaction operation signal, and the flow splitting and merging control valve (23) is controlled to switch to the flow splitting valve position.

9. The hydraulic control system for a compressed garbage truck according to claim 6, characterized in that, The controller is also configured to: In response to the idle signal, the pump drive motor (13) is controlled to operate in the low-speed operation state according to the idle signal, and the flow control valve (23) is controlled to switch to the flow control position.

10. The hydraulic control system for a compressed garbage truck according to claim 6, characterized in that, The hydraulic control system further includes a pressure sensor (8) for monitoring the pressure at the first main inlet (215) of the first multi-way valve (21) and / or the second main inlet (225) of the second multi-way valve (22). The pressure sensor (8) is configured to issue a deceleration signal when the oil pressure in the sensed pipeline exceeds a preset value. The controller is also configured to: In response to the deceleration signal, the pumping drive motor (13) is controlled to decelerate according to the deceleration signal.

11. A compressed garbage truck, characterized in that, Includes a hydraulic control system for a compactor garbage truck as described in any one of claims 1 to 10.

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