Hydraulic unloading system and method for compressed garbage trucks and compressed garbage trucks

Abstract

This invention discloses a hydraulic unloading system, method, and compactor garbage truck. The system includes an oil-driving device, a pusher cylinder, a pusher cylinder, an oil-driving directional valve, and a floating directional valve. The oil-driving directional valve has a first working port and a second working port. The first working port is connected to the rodless chamber of the pusher cylinder and the pusher cylinder, respectively, and the second working port is connected to the rod chamber of the pusher cylinder and the pusher cylinder, respectively. The oil-driving directional valve selects one of the first working port and the second working port to connect to the inlet oil circuit and the other to the return oil circuit. The floating directional valve is located on the branch oil circuit where the first working port connects to the rodless chamber of the pusher cylinder, and is used to select one of the first working port and the return oil circuit to connect to the rodless chamber of the pusher cylinder. By adding the floating directional valve, when the pusher moves to the bottom of the garbage hopper, the pusher cylinder is in a floating state, thereby improving the smoothness of the pusher movement.

Description

Technical Field

[0001] This invention belongs to the field of garbage truck technology, specifically relating to a hydraulic unloading system and method for a compressed garbage truck, and a compressed garbage truck. Background Technology

[0002] To address the issue of wastewater leakage at the sealing surface between the garbage bin and the compactor in traditional compactor garbage trucks, leak-free compactor garbage trucks have emerged on the market. In these trucks, the garbage bin and compactor housing are integrated, with the compactor completely housed within the bin. The garbage compaction process is completed within the bin, eliminating the wastewater leakage problems common in traditional rear-loading compactor garbage trucks and preventing secondary pollution. Furthermore, the rear of the bin's bottom plate features a ground-facing garbage hopper, effectively reducing the height at which garbage is loaded.

[0003] Meanwhile, the leak-free compressed garbage truck is also equipped with a pushing mechanism including a pusher component and a pusher plate component. This allows the pusher plate component to press against the bottom plate of the garbage container and the inner wall of the garbage hopper during unloading, smoothly pushing the compressed garbage out from the rear of the garbage container and preventing garbage from remaining in the bottom plate or garbage hopper. However, in the existing technology, the hydraulic system of the pushing mechanism always controls the pusher plate cylinder with a constant pressure to ensure that the movement trajectory of the bottom of the pusher plate coincides with the curve of the inner wall of the garbage hopper. However, during the process of the pusher plate moving to the inner wall of the garbage hopper where it is on an upward curve, the back pressure of the pusher plate cylinder can easily cause the movement to be obstructed. Summary of the Invention

[0004] To address the aforementioned defects or deficiencies, this invention provides a hydraulic unloading system, method, and compactor garbage truck, aiming to solve the technical problem that the movement is easily obstructed due to the increased back pressure of the pusher cylinder during the process of the pusher plate moving to the inner wall of the garbage bin on an upward curve.

[0005] To achieve the above objectives, the present invention provides a hydraulic unloading system for a compressed garbage truck, wherein the hydraulic unloading system for a compressed garbage truck includes an oil driving device, a pusher cylinder, a pusher cylinder, an oil driving directional valve, and a floating directional valve; the oil driving device is provided with an inlet oil circuit and a return oil circuit; the pusher cylinder is used to drive the pusher; the pusher cylinder is mounted on the pusher and is used to drive the pusher; the oil driving directional valve is provided with a first working port and a second working port, the first working port being connected to the rodless chamber of the pusher cylinder and the pusher cylinder respectively, and the second working port being connected to the rod chamber of the pusher cylinder and the pusher cylinder respectively; the oil driving directional valve is used to switch between the first working port and the second working port, selecting one to be connected to the inlet oil circuit and the other to be connected to the return oil circuit; the floating directional valve is located on the branch oil circuit connecting the first working port and the rodless chamber of the pusher cylinder, and is used to switch between the first working port and the return oil circuit, selecting one to be connected to the rodless chamber of the pusher cylinder.

[0006] In this embodiment of the invention, the hydraulic unloading system of the compressed garbage truck further includes a first sequence valve and a second sequence valve. The first sequence valve is located on a branch oil line that connects the first working oil port with the rodless chamber of the pusher cylinder, and the second sequence valve is located on a branch oil line that connects the second working oil port with the rod chamber of the pusher cylinder.

[0007] In this embodiment of the invention, a pressure reducing valve is also provided on the branch oil line that connects the first working oil port to the rodless chamber of the push plate cylinder, and the pressure reducing valve is located between the first working oil port and the floating directional valve.

[0008] In this embodiment of the invention, the hydraulic unloading system of the compressed garbage truck also includes an overload valve. One end of the overload valve is connected to the main oil circuit, which is connected to the first working oil port and the pusher cylinder and the push plate cylinder respectively, and the other end is connected to the return oil circuit.

[0009] In this embodiment of the invention, the oil displacement device includes an oil tank, an oil pump assembly, an oil suction filter, and a return oil filter. The oil tank is provided with an oil inlet passage and an oil return passage. The oil suction filter and the oil pump assembly are both located on the oil inlet passage, and the oil return filter is located on the oil return passage.

[0010] In this embodiment of the invention, the hydraulic unloading system of the compressed garbage truck also includes a position detection device for detecting the position of the pusher.

[0011] To achieve the above objectives, the present invention also provides a hydraulic unloading method for a compressed garbage truck, wherein the hydraulic unloading method for a compressed garbage truck is applied to the hydraulic unloading system for a compressed garbage truck as described above, and includes:

[0012] The control oil reversing valve is switched to connect the first working oil port with the oil inlet circuit and the second working oil port with the oil return circuit, so that both the push plate cylinder and the push shovel cylinder can extend.

[0013] Once it is determined that the pusher plate has moved to the bottom of the garbage hopper, the control float reversing valve is switched from the first working oil port to the return oil circuit to connect with the rodless chamber of the pusher plate cylinder, so that both the rodless chamber and the rod chamber of the pusher plate cylinder are connected to the return oil circuit.

[0014] Once it is determined that the pusher plate has moved to the point of disengagement from the garbage hopper, the control float reversing valve switches from the return oil circuit to the first working oil port to reconnect with the rodless chamber of the pusher plate cylinder;

[0015] Once the pusher has moved to the preset unloading position, the control oil reversing valve is switched to connect the second working oil port with the oil inlet circuit and the first working oil port with the oil return circuit, so that both the push plate cylinder and the pusher cylinder retract.

[0016] In this embodiment of the invention, the hydraulic unloading method for a compressed garbage truck further includes:

[0017] Once it is determined that the pusher plate has moved to the point where it is about to enter the garbage bin, the oil displacement device is controlled to reduce the oil displacement flow rate.

[0018] In this embodiment of the invention, the control oil displacement valve is switched to connect the first working oil port with the inlet oil circuit and the second working oil port with the return oil circuit, so that both the push plate cylinder and the push shovel cylinder extend, including:

[0019] Control the oil displacement directional valve to switch the first working oil port to connect with the oil inlet circuit, and the second working oil port to connect with the oil return circuit;

[0020] Under the action of the first sequence valve, the push plate cylinder and the push shovel cylinder are sequentially controlled to extend. The first sequence valve is located on the branch oil line that connects the first working oil port with the rodless chamber of the push shovel cylinder.

[0021] In this embodiment of the invention, when it is determined that the pusher has moved to the correct position, the hydraulic directional valve is controlled to switch to connect the second working port with the inlet oil circuit and the first working port with the return oil circuit, so that both the pusher cylinder and the pusher cylinder retract, including:

[0022] Once the pusher is in position, the control oil reversing valve is switched to connect the second working oil port with the oil inlet circuit and the first working oil port with the oil return circuit.

[0023] Under the action of the second sequence valve, the push plate cylinder and the push shovel cylinder are controlled to retract in sequence. The second sequence valve is located on the branch oil line that connects the second working oil port with the rod chamber of the push shovel cylinder.

[0024] To achieve the above objectives, the present invention provides a compressed garbage truck, wherein the compressed garbage truck includes the hydraulic unloading system of the compressed garbage truck as described above.

[0025] Through the above technical solution, the hydraulic unloading system for compressed garbage trucks provided in this embodiment of the invention has the following beneficial effects:

[0026] When using the aforementioned hydraulic unloading system for a compressed garbage truck, the system includes an oil-driving device, a pusher cylinder, a pusher cylinder, an oil-driving directional valve, and a floating directional valve. The first working port of the oil-driving directional valve is connected to the rodless chambers of both the pusher cylinder and the pusher cylinder, and the second working port is connected to the rod chambers of both the pusher cylinder and the pusher cylinder. The oil-driving directional valve is used to switch between the first and second working ports, selecting one to connect to the inlet oil circuit of the oil-driving device and the other to the return oil circuit of the oil-driving device. The floating directional valve is located at the point where the first working port connects to the rodless chamber of the pusher cylinder. On the branch oil line, it is used to switch between the first working oil port and the return oil line to connect with the rodless chamber of the push plate cylinder. When the push plate moves to the bottom of the garbage hopper, the floating directional valve can be controlled to switch from the first working oil port to the return oil line to connect with the rodless chamber of the push plate cylinder. The rod chamber of the push plate cylinder is also connected to the return oil line through the oil drive directional valve, so that the push plate cylinder is in a floating state. During the process of the push plate moving upward along the inner wall of the garbage hopper, it only bears the reaction force from the inner wall of the garbage hopper, avoiding the phenomenon of the push plate movement being blocked, and achieving the purpose of improving the smoothness of the push plate movement.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0028] 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:

[0029] Figure 1 This is a structural schematic diagram of a compressed garbage truck according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the pusher, push plate, and push plate cylinder according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of a structure of an embodiment of a hydraulic unloading system for a compressed garbage truck according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of another embodiment of the hydraulic unloading system for a compressed garbage truck according to one embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the position of the push plate moving path according to an embodiment of the present invention;

[0034] Figure 6 This is a flowchart of a hydraulic unloading method for a compressed garbage truck according to an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] 100 Oil displacement device 101 Oil tank

[0037] 102 Oil Inlet Circuit 103 Oil Return Circuit

[0038] 104 Oil pump assembly 105 Suction filter

[0039] 106 Return oil filter 200 Pusher cylinder

[0040] 201 First sequence valve 202 Second sequence valve

[0041] 300 push plate cylinder, 301 pressure reducing valve

[0042] 400 Oil Displacement Valve P First Inlet

[0043] A. First working oil port B. Second working oil port

[0044] T First return port 401 Pusher overload valve

[0045] 402 System relief valve; 500 Floating directional valve

[0046] 600 Chassis frame 700 Trash can

[0047] 701 Base plate; 702 Garbage bin

[0048] 703 Tailgate; 704 Front Side Panel

[0049] 800 Pusher 801 Position Detection Device

[0050] 900 push plate Detailed Implementation

[0051] 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.

[0052] The hydraulic unloading system, method, and compressed garbage truck of the present invention are described below with reference to the accompanying drawings.

[0053] like Figures 1 to 4 As shown, the present invention provides a hydraulic unloading system for a compressed garbage truck, wherein the hydraulic unloading system for a compressed garbage truck includes:

[0054] The oil displacement device 100 is provided with an oil inlet passage 102 and an oil return passage 103;

[0055] Pusher cylinder 200 is used to drive pusher 800;

[0056] Push plate cylinder 300 is mounted on push shovel 800 and used to drive push plate 900;

[0057] The oil-driving directional valve 400 is provided with a first working oil port A and a second working oil port B. The first working oil port A is connected to the rodless chamber of the pusher cylinder 200 and the pusher cylinder 300, respectively. The second working oil port B is connected to the rod chamber of the pusher cylinder 200 and the pusher cylinder 300, respectively. The oil-driving directional valve 400 is used to switch between the first working oil port A and the second working oil port B, selecting one of them to be connected to the oil inlet circuit 102 and the other to be connected to the oil return circuit 103.

[0058] A floating directional valve 500 is located on a branch oil line that connects the first working oil port A with the rodless chamber of the push plate cylinder 300, and is used to switch between the first working oil port A and the return oil line 103 to connect with the rodless chamber of the push plate cylinder 300.

[0059] When using the aforementioned hydraulic unloading system for a compressed garbage truck, the system includes an oil-driving device 100, a pusher cylinder 200, a pusher cylinder 300, an oil-driving directional valve 400, and a floating directional valve 500. The first working port A of the oil-driving directional valve 400 is connected to the rodless chambers of both the pusher cylinder 200 and the pusher cylinder 300, and the second working port B is connected to the rod chambers of both the pusher cylinder 200 and the pusher cylinder 300. The oil-driving directional valve 400 is used to switch between the first working port A and the second working port B, selecting one to connect to the oil inlet circuit 102 of the oil-driving device 100 and the other to the oil return circuit 103 of the oil-driving device 100. The floating directional valve 500 is located at the first working port A connected to the rodless chamber of the pusher cylinder 300. The branch oil line is used to switch between the first working oil port A and the return oil line 103 to connect with the rodless chamber of the push plate cylinder 300. When the push plate 900 moves to the bottom of the garbage hopper 702, the floating directional valve 500 can be controlled to switch from the first working oil port A to the return oil line 103 to connect with the rodless chamber of the push plate cylinder 300. The rod chamber of the push plate cylinder 300 is also connected to the return oil line 103 through the oil driving directional valve 400, so that the push plate cylinder 300 is in a floating state. During the upward movement of the push plate 900 along the inner wall of the garbage hopper 702, it only bears the reaction force from the inner wall of the garbage hopper 702, avoiding the phenomenon of the push plate 900 being obstructed and achieving the purpose of improving the smoothness of the push plate 900's movement.

[0060] Specifically, the oil displacement directional valve 400 is also provided with a first oil inlet P, a first oil return port T, a first solenoid valve and a second solenoid valve. The first oil inlet P is connected to the oil inlet circuit 102 of the oil displacement device 100, and the first oil return port T is connected to the oil return circuit 103 of the oil displacement device 100. When the first solenoid valve is energized, the oil reversing valve 400 switches to connect the first oil inlet P with the first working oil inlet A and the first oil return port T with the second working oil inlet B. This connects the oil inlet circuit 102 to the rodless chambers of the pusher cylinder 200 and the push plate cylinder 300, respectively, and the oil return circuit 103 to the rod chambers of the pusher cylinder 200 and the push plate cylinder 300, respectively. This enables the pusher cylinder 200 and the push plate cylinder 300 to extend. When the push plate cylinder 300 extends, it drives the push plate 900 to move towards the bottom plate 701 or the inner wall of the garbage bin 702. When the pusher cylinder 200 extends, it drives the pusher 800 to move towards the tailgate 703 of the garbage bin 700. The unloading process is achieved by switching the oil inlet valve 400 to connect the first oil inlet P with the second working oil inlet B and the first oil return port T with the first working oil inlet A. This connects the oil inlet circuit 102 to the rod chambers of the pusher cylinder 200 and the push plate cylinder 300, and the oil return circuit 103 to the rodless chambers of the pusher cylinder 200 and the push plate cylinder 300, respectively. This enables the retraction of the pusher cylinder 200 and the push plate cylinder 300. When the push plate cylinder 300 retracts, it drives the push plate 900 to move away from the bottom plate 701 of the garbage bin 700. When the pusher cylinder 200 retracts, it drives the pusher 800 to move away from the tailgate 703 of the garbage bin 700, ultimately achieving a reset. More specifically, the oil inlet valve 400 can be a three-position six-way directional valve.

[0061] It should be noted that a main oil circuit and two branch oil circuits are provided between the first working oil port A and the rodless chambers of the pusher cylinder 200 and the pusher cylinder 300. One end of the main oil circuit is connected to the first working oil port A, and the other end branches and connects to the two branch oil circuits respectively. The ends of the two branch oil circuits away from the main oil circuit are connected to the rodless chambers of the pusher cylinder 200 and the pusher cylinder 300 respectively. A main oil circuit and two branch oil circuits are also provided between the second working oil port B and the rod chambers of the pusher cylinder 200 and the pusher cylinder 300. One end of the main oil circuit is connected to the second working oil port B, and the other end branches and connects to the two branch oil circuits respectively. The ends of the two branch oil circuits away from the main oil circuit are connected to the rod chambers of the pusher cylinder 200 and the pusher cylinder 300 respectively.

[0062] Furthermore, the floating directional valve 500 is provided with a second oil inlet, a second oil return port, a third working oil port, and a third solenoid valve. The third working oil port is connected to the rodless chamber of the push plate cylinder 300. The second oil inlet is connected to the branch oil circuit that connects the first working oil port A with the rodless chamber of the push plate cylinder 300. The second oil return port is connected to the return oil circuit 103. Specifically, as shown... Figure 3 As shown, the second return port is directly connected to the return oil filter 106 on the return oil circuit 103, or as... Figure 4 As shown, the second return port can also be connected to the rod chamber of the push plate cylinder 300 to connect with the return oil circuit 103. When the control third solenoid valve is energized, the floating directional valve 500 switches to the third working port to connect with the second return port, that is, the rodless chamber of the push plate cylinder 300 is connected with the return oil circuit 103. When the control third solenoid valve is de-energized, the floating directional valve 500 switches to the third working port to connect with the first working port A, that is, the rodless chamber of the push plate cylinder 300 is connected with the inlet oil circuit 102.

[0063] like Figure 3 and Figure 4 As shown in the embodiment of the invention, the hydraulic unloading system of the compressed garbage truck further includes a first sequence valve 201 and a second sequence valve 202. The first sequence valve 201 is located on a branch oil line connecting the first working oil port A and the rodless chamber of the pusher cylinder 200, and the second sequence valve 202 is located on a branch oil line connecting the second working oil port B and the rod chamber of the pusher cylinder 200. By adding the first sequence valve 201 and the second sequence valve 202, the pusher cylinder 300 can act before the pusher cylinder 200 during both unloading and resetting operations, which helps improve the unloading effect and resetting efficiency.

[0064] Specifically, when the first solenoid valve is energized, the oil reversing valve 400 switches to connect the first oil inlet P with the first working oil inlet A, and the first oil return port T with the second working oil inlet B. Due to the presence of the first sequence valve 201, the oil inlet circuit 102 is only connected to the rodless chamber of the push plate cylinder 300. The hydraulic oil first enters the rodless chamber of the push plate cylinder 300, and the push plate cylinder 300 extends, pushing the push plate 900 towards the bottom plate 701 of the garbage bin 700 until the lower end of the push plate 900 abuts against the bottom plate 701 of the garbage bin 700. At this time, the pressure in the rodless chamber of the push plate cylinder 300 rises. When the set pressure P1 of the first sequence valve 201 is reached, the hydraulic oil can enter the rodless chamber of the push shovel cylinder 200, and the push shovel cylinder 200 extends, pushing the push shovel 800 towards the tailgate 703 of the garbage bin 700. This enables unloading operations. When the second solenoid valve is energized, the oil reversing valve 400 switches to connect the first oil inlet P with the second working oil inlet B, and the first oil return port T with the first working oil inlet A. Due to the presence of the second sequence valve 202, the oil inlet circuit 102 is only connected to the rod chamber of the push plate cylinder 300. The hydraulic oil first enters the rod chamber of the push plate cylinder 300, and the push plate cylinder 300 retracts, pulling the push plate 900 towards the bottom plate 701 away from the garbage bin 700 until the push plate 900 is fully reset. At this time, the pressure in the rod chamber of the push plate cylinder 300 rises, and after reaching the set pressure P4 of the second sequence valve 202, the hydraulic oil can enter the rod chamber of the push shovel cylinder 200. The push shovel cylinder 200 retracts, pulling the push shovel 800 towards the tailgate 703 away from the garbage bin 700, thus achieving the reset operation.

[0065] Please see again Figure 3 and Figure 4 In this embodiment of the invention, a pressure reducing valve 301 is also provided on the branch oil line connecting the first working oil port A and the rodless chamber of the push plate cylinder 300, and the pressure reducing valve 301 is located between the first working oil port A and the floating directional valve 500. The addition of the pressure reducing valve 301 can ensure that the pressure in the rodless chamber of the push plate cylinder 300 is always maintained at the set pressure P2 of the pressure reducing valve 301, so that the push plate 900 moves against the bottom plate 701 or the inner wall of the garbage bin 702 of the garbage container 700 with a constant pressure.

[0066] In this embodiment of the invention, the hydraulic unloading system of the compressed garbage truck further includes an overload valve 401. One end of the overload valve 401 is connected to the main oil circuit, which is connected to the first working oil port A and is respectively connected to the pusher cylinder 200 and the push plate cylinder 300. The other end is connected to the return oil circuit 103. After the pusher cylinder 200 extends to its position, due to the limiting effect of the garbage container 700 on the pusher 800, the pressure in the rodless chamber of the pusher cylinder 200 rises. The addition of the overload valve 401 allows the hydraulic oil in the rodless chamber of the pusher cylinder 200 to flow to the return oil circuit 103 through the overload valve 401 after the oil pressure reaches the set pressure P3 of the overload valve 401, thus unloading the garbage. At this time, the garbage in the garbage container 700 is completely discharged.

[0067] In this embodiment of the invention, the oil displacement device 100 includes an oil tank 101, an oil pump assembly 104, an oil suction filter 105, and a return oil filter 106. The oil tank 101 is provided with an oil inlet passage 102 and an oil return passage 103. The oil suction filter 105 and the oil pump assembly 104 are both located on the oil inlet passage 102, and the oil return filter 106 is located on the oil return passage 103. The oil pump assembly 104 pumps the hydraulic oil in the oil tank 101 from the oil inlet passage 102, through the oil suction filter 105, to the oil displacement reversing valve 400. The hydraulic oil flowing to the oil return passage 103 can flow back to the oil tank 101 through the oil return filter 106. The oil suction filter 105 and the oil return filter 106 can filter the hydraulic oil. Specifically, the oil pump assembly 104 includes an oil pump body and a driver that drives the oil pump body to rotate. Of course, the present invention is not limited to this, and the oil displacement device 100 may also not include the oil suction filter 105 and the oil return filter 106.

[0068] See Figure 1In this embodiment of the invention, the hydraulic unloading system of the compressed garbage truck also includes a position detection device 801 for detecting the position of the pusher 800. The position detection device 801 facilitates accurate control of the hydraulic reversing valve 400 and the floating reversing valve 500. Specifically, the position detection device 801 can be a pull rope displacement sensor. The body of the pull rope displacement sensor is fixed to the front side plate 704 of the garbage container 700, and the pull rope is mounted on the pusher 800. When the pusher cylinder 200 extends to drive the pusher 800 towards the tailgate 703 of the garbage container 700, the pull rope extends. When the pusher cylinder 200 retracts to drive the pusher 800 away from the tailgate 703 of the garbage container 700, the pull rope retracts. Of course, the present invention is not limited to this. The position detection device 801 can also be a laser sensor or an angle sensor, etc. The laser sensor is installed on the front side plate 704 of the garbage bin 700 (similar to the position of the pull wire displacement sensor), and the laser target is installed on the pusher 800. The movement position of the pusher 800 is calculated by the time of emitting and receiving the laser signal. In the case of the pusher cylinder 200 being tilted, the pusher cylinder 200 will produce an angle change when the pusher 800 moves. An angle sensor can be installed on the pusher cylinder 200 (generally in a place with a large angle change rate, such as at the rod head or the cylinder bottom bearing). By judging the angle of the pusher cylinder 200, the specific position of the pusher cylinder 200 can be calculated by reverse calculation. In addition, the position detection device 801 is not limited to position sensors. It can also use pressure sensors to detect the pressure change in the rodless chamber of the push plate cylinder 300 during the movement of the pusher 800. When the pressure increases to the set value, the floating reversing valve 500 is energized, and the push plate cylinder 300 is in a floating state. It can also achieve the same function and has a wider range of applications. If the base plate bulges and deforms later, it can also automatically avoid deformation through this method.

[0069] In this embodiment of the invention, the hydraulic unloading system of the compressed garbage truck further includes a control device, which is communicatively connected to the oil-driving directional valve 400, the floating directional valve 500, and the position detection device 801, and is configured as follows:

[0070] Upon receiving the instruction to perform the unloading operation, the first solenoid valve controlling the oil displacement directional valve 400 is energized.

[0071] After the position detection device 801 detects that the pusher 800 has reached the first preset position, the third solenoid valve of the floating reversing valve 500 is energized. It can be determined that the pusher 900 has reached the bottom of the garbage bin 702 based on the pusher 800 reaching the first preset position.

[0072] After the position detection device 801 detects that the pusher 800 has reached the second preset position, the third solenoid valve controlling the floating reversing valve 500 is de-energized. It can be determined that the pusher 900 is disengaged from the inner wall of the garbage bin 702 based on the pusher 800 reaching the second preset position.

[0073] After the position detection device 801 detects that the pusher 800 has reached the third preset position, the second solenoid valve of the control oil reversing valve 400 is energized. The unloading action can be determined to be completed based on the pusher 800 reaching the third preset position.

[0074] In this embodiment of the invention, the control device is also communicatively connected to the driver of the oil pump assembly 104, and is further configured to:

[0075] After the position detection device 801 detects that the pusher 800 has reached the fourth preset position, it controls the driver to reduce the driving speed to reduce the amount of oil pump 104. It can be determined that the pusher 900 is about to enter the garbage bin 702 and abut against the inner wall of the garbage bin 702 based on the pusher 800 reaching the fourth preset position.

[0076] In addition, such as Figure 6 As shown, the present invention also provides a hydraulic unloading method for a compressed garbage truck, wherein the hydraulic unloading method for a compressed garbage truck is applied to the hydraulic unloading system for a compressed garbage truck as described above, and includes:

[0077] Step 100: Control the oil reversing valve 400 to switch the first working oil port A to connect with the oil inlet circuit 102 and the second working oil port B to connect with the oil return circuit 103, so that both the push plate cylinder 300 and the push shovel cylinder 200 extend.

[0078] Specifically, upon receiving the instruction to perform the unloading operation, the first solenoid valve of the oil-driving directional valve 400 is energized, so that the first working oil port A of the oil-driving directional valve 400 is connected to the first oil inlet P, and the second working oil port B is connected to the first oil return port T. The oil-driving device 100 can supply oil to the rodless chambers of the push plate cylinder 300 and the push shovel cylinder 200, driving both the push plate cylinder 300 and the push shovel cylinder 200 to extend. The push plate cylinder 300 drives the push plate 900 to move toward the bottom plate 701 near the garbage bin 700, and the push shovel cylinder 200 drives the push shovel 800 to move toward the tailgate 703 near the garbage bin 700.

[0079] Step 200: After determining that the push plate 900 has moved to the bottom of the garbage bin 702, control the floating reversing valve 500 to switch from the first working oil port A to the return oil circuit 103 to connect with the rodless chamber of the push plate cylinder 300, so that both the rodless chamber and the rod chamber of the push plate cylinder 300 are connected to the return oil circuit 103.

[0080] Furthermore, the position detection device 801 can detect the position of the pusher 800. When the position detection device 801 detects that the pusher 800 has moved to the first preset position, it can determine that the pusher 900 has moved to the bottom of the garbage bin 702. At this time, the third solenoid valve of the floating directional valve 500 can be energized, so that the third working oil port of the floating directional valve 500 is switched from the second oil inlet to the second oil outlet. That is, the floating directional valve 500 can control the pusher cylinder 300 to move freely. The rod chamber switches from being connected to the first working oil port A to being connected to the return oil circuit 103. At the same time, the rod chamber of the push plate cylinder 300 can also be connected to the return oil circuit 103 due to the action of the oil driving reversing valve 400, so that the push plate cylinder 300 is in a floating state. During the upward movement of the push plate 900 along the inner wall of the garbage bin 702, it only bears the reaction force from the inner wall of the garbage bin 702, avoiding the phenomenon of the push plate 900 being obstructed, and achieving the purpose of improving the smoothness of the movement of the push plate 900.

[0081] Step 300: After confirming that the push plate 900 has moved to the point of disengagement from the garbage hopper 702, control the floating directional valve 500 to switch from the return oil circuit 103 to the first working oil port A to reconnect with the rodless chamber of the push plate cylinder 300.

[0082] Furthermore, when the position detection device 801 detects that the pusher 800 has moved to the second preset position, it can be determined that the pusher 900 has disengaged from the garbage hopper 702 and re-engaged with the bottom plate 701 of the garbage bin 700. At this time, the third solenoid valve of the floating directional valve 500 can be de-energized, so that the third working oil port of the floating directional valve 500 can be reset from being connected to the second oil outlet to being connected to the second oil inlet. That is, the floating directional valve 500 can reset the rodless chamber of the pusher cylinder 300 from being connected to the return oil circuit 103 to being connected to the first working oil port A. The oil driving device 100 continues to supply oil to the pusher cylinder 300 so that the pusher 900 continues to be in contact with the bottom plate 701 of the garbage bin 700.

[0083] Step 400: After determining that the pusher 800 has moved to the preset unloading position, control the oil reversing valve 400 to switch the second working oil port B to connect with the oil inlet circuit 102 and the first working oil port A to connect with the oil return circuit 103, so that both the push plate cylinder 300 and the pusher cylinder 200 retract.

[0084] More specifically, after the position detection device 801 detects that the pusher 800 has reached the third preset position, it can be determined that the unloading action is completed. The pusher 800 moves to the preset unloading position, and then the second solenoid valve of the oil driving reversing valve 400 is energized, so that the second working oil port B of the oil driving reversing valve 400 is connected to the first oil inlet P, and the first working oil port A is connected to the first oil return port T. The oil driving device 100 can supply oil to the rod chamber of the push plate cylinder 300 and the pusher cylinder 200, driving both the push plate cylinder 300 and the pusher cylinder 200 to retract. The push plate cylinder 300 drives the push plate 900 to move toward the bottom plate 701 away from the garbage bin 700, and the pusher cylinder 200 drives the pusher 800 to move toward the tailgate 703 away from the garbage bin 700, completing the reset operation.

[0085] In this embodiment of the invention, the hydraulic unloading method for a compressed garbage truck further includes:

[0086] Once it is determined that the pusher plate 900 has moved to the point where it is about to enter the garbage bin 702, the oil displacement device 100 is controlled to reduce the oil displacement flow rate.

[0087] Specifically, after the position detection device 801 detects that the pusher 800 has reached the fourth preset position, the driver of the oil pump assembly 104 can be controlled to reduce the driving speed, thereby reducing the amount of oil driven by the oil pump assembly 104. Since the pusher 800 has reached the fourth preset position, it can be determined that the pusher plate 900 is about to enter the garbage bin 702 and abut against the inner wall of the garbage bin 702. The reduced oil flow of the oil driving device 100 can slow down the extension speed of the pusher cylinder 200, so that the pusher plate 900 has sufficient time to abut against the inner wall of the garbage bin 702.

[0088] In this embodiment of the invention, the control oil displacement valve 400 is switched to connect the first working oil port A with the oil inlet circuit 102 and the second working oil port B with the oil return circuit 103, so that both the push plate cylinder 300 and the push shovel cylinder 200 extend, including:

[0089] Control the oil displacement valve 400 to switch to the first working oil port A connected to the oil inlet circuit 102, and the second working oil port B connected to the oil return circuit 103;

[0090] Under the action of the first sequence valve 201, the push plate cylinder 300 and the push shovel cylinder 200 are sequentially controlled to extend. The first sequence valve 201 is located on the branch oil line that connects the first working oil port A with the rodless chamber of the push shovel cylinder 200.

[0091] Specifically, when the first solenoid valve is energized, the oil reversing valve 400 switches to connect the first oil inlet P with the first working oil inlet A, and the first oil return port T with the second working oil inlet B. Due to the presence of the first sequence valve 201, the oil inlet circuit 102 is only connected to the rodless chamber of the push plate cylinder 300. The hydraulic oil first enters the rodless chamber of the push plate cylinder 300, and the push plate cylinder 300 extends, pushing the push plate 900 towards the bottom plate 701 of the garbage bin 700 until the lower end of the push plate 900 abuts against the bottom plate 701 of the garbage bin 700. At this time, the pressure in the rodless chamber of the push plate cylinder 300 rises. When the set pressure P1 of the first sequence valve 201 is reached, the hydraulic oil can enter the rodless chamber of the push shovel cylinder 200, and the push shovel cylinder 200 extends, pushing the push shovel 800 towards the tailgate 703 of the garbage bin 700 to realize the unloading operation.

[0092] In this embodiment of the invention, when it is determined that the pusher 800 has moved into position, the control oil reversing valve 400 is switched to connect the second working oil port B with the oil inlet circuit 102, and the first working oil port A with the oil return circuit 103, so that both the pusher cylinder 300 and the pusher cylinder 200 retract, including:

[0093] Once it is confirmed that the pusher 800 has moved into place, the control oil reversing valve 400 is switched to connect the second working oil port B with the oil inlet circuit 102, and the first working oil port A with the oil return circuit 103.

[0094] Under the action of the second sequence valve 202, the push plate cylinder 300 and the push shovel cylinder 200 are controlled to retract in sequence. The second sequence valve 202 is located on the branch oil line that connects the second working oil port B with the rod chamber of the push shovel cylinder 200.

[0095] Specifically, when the second solenoid valve is energized, the oil reversing valve 400 switches to connect the first oil inlet P with the second working oil inlet B, and the first oil return port T with the first working oil inlet A. Due to the presence of the second sequence valve 202, the oil inlet circuit 102 is only connected to the rod chamber of the push plate cylinder 300. The hydraulic oil first enters the rod chamber of the push plate cylinder 300, and the push plate cylinder 300 retracts, pulling the push plate 900 to move towards the bottom plate 701 away from the garbage bin 700 until the push plate 900 is fully reset. At this time, the pressure in the rod chamber of the push plate cylinder 300 rises, and after reaching the set pressure P4 of the second sequence valve 202, the hydraulic oil can enter the rod chamber of the push shovel cylinder 200. The push shovel cylinder 200 retracts, pulling the push shovel 800 to move towards the tailgate 703 away from the garbage bin 700, thus realizing the reset operation.

[0096] More specifically, such as Figure 5As shown, the overall control approach for the hydraulic unloading method for compressed garbage trucks provided by this invention can be as follows:

[0097] With the push plate 900 in its initial position S0, the driver of the oil pump assembly 104 is activated. The control device energizes the first electromagnet of the oil displacement directional valve 400. The hydraulic oil pumped out by the oil pump assembly 104 passes through the oil displacement directional valve 400. Due to the action of the first sequence valve 201, the hydraulic oil first enters the rodless chamber of the push plate cylinder 300. The push plate cylinder 300 extends, controlling the push plate 900 to move towards the bottom plate 701 of the garbage bin 700 until the push plate 900 abuts against the garbage bin 700. At this time, the pressure in the rodless chamber of the push plate cylinder 300 rises and reaches the set pressure P1 of the first sequence valve 201. Then, the hydraulic oil enters the rodless chamber of the push shovel cylinder 200 through the first sequence valve 201. The push shovel cylinder 200 extends and controls the push shovel 800 to move towards the tailgate 703 of the garbage bin 700. The pressure in the rodless chamber of the push plate cylinder 300 is controlled by the set pressure P2 of the pressure reducing valve 301, so that the push plate 900 moves against the base plate 701 with a constant pressure.

[0098] When the pusher plate 900 reaches position S1, the position detection device 801 outputs a position signal to the control device. The control device controls the oil pump assembly 104 to reduce speed and flow rate, ensuring that when the pusher plate 800 passes through the garbage hopper 702 between position S1 and position S2, the pusher plate 900 fully fits the inner wall of the garbage hopper 702 (the rodless chamber pressure of the pusher plate cylinder 300 is P2), making it easy to clean the garbage in the garbage hopper 702.

[0099] When the push plate 900 reaches position S2, the position detection device 801 outputs a position signal to the control device. The control device controls the third solenoid valve of the floating directional valve 500 to be energized. The rodless chamber of the push plate cylinder 300 is connected to the oil tank 101 through the return oil passage 103. At this time, the rod chamber of the push plate cylinder 300 is also connected to the oil tank 101 through the oil driving directional valve 400 and the return oil passage 103. When the push shovel 800 passes from position S2 to position S3, the push shovel 800 is pushed out normally, while the push plate 900 is subjected to the reaction force of the garbage bin 702, causing the push plate cylinder 300 to retract (the push plate 900 always adheres to the inner wall of the garbage bin 702 throughout the process) until the push shovel 800 reaches position S3 and the push plate 900 disengages from the garbage bin 702.

[0100] When the pusher plate 900 reaches position S3, the position detection device 801 outputs a position signal to the control device. The control device de-energizes the third solenoid valve of the floating directional valve 500, disconnecting the rodless chamber of the pusher plate cylinder 300 from the oil tank 101 and reconnecting it to the first working port A of the oil-driving directional valve 400. The pusher plate 900 remains in contact with the bottom plate 701 of the garbage bin 700 (at this time, the pressure in the rodless chamber of the pusher plate cylinder 300 is P2). The pusher 800 continues to push out, reaching position S4. The pusher 800 has completed its movement, and the pressure in the rodless chamber of the pusher cylinder 200 rises. After reaching the set pressure P3 of the overload valve 401, the pressurized oil in the rodless chamber of the pusher cylinder 200 returns to the oil tank 101 through the overload valve 401. At this time, the garbage in the garbage bin 700 is completely discharged, completing the unloading operation.

[0101] When the push plate 900 reaches position S4, the position detection device 801 outputs a position signal to the control device. The control device energizes the second electromagnet of the oil displacement valve 400. The hydraulic oil pumped by the oil pump assembly 104 passes through the oil displacement valve 400 and, due to the action of the second sequence valve 202, first enters the rod chamber of the push plate cylinder 300. The push plate cylinder 300 then retracts, controlling the push plate 900 to move away from the bottom plate 701 of the garbage bin 700 until the push plate 900 is fully retracted. When the push plate 900 retracts to its original position (maintaining a constant gap between itself and the bottom plate 701 of the garbage bin 700 to prevent garbage from being trapped when the pusher 800 retracts), the pressure in the rod chamber of the push plate cylinder 300 rises. After reaching the set pressure P4 of the second sequence valve 202, hydraulic oil enters the rod chamber of the pusher cylinder 200, and the pusher cylinder 200 retracts, controlling the pusher 800 to move away from the tailgate 703 of the garbage bin 700 until the pusher 800 reaches position S1, completing the reset operation.

[0102] Meanwhile, the formula for calculating the set pressure P2 of the pressure reducing valve 301 can be:

[0103] The formula for calculating the set pressure P3 of the overload valve 401 is as follows:

[0104] The set pressure P3 of the first sequence valve 201 can be: and

[0105] The set pressure P4 of the second sequence valve 202 can be: And P4 < P system

[0106] Where: F1 is the external force exerted on the push plate 900 during its extension when the push plate 900 is in position S0 (including the frictional force between the push plate 900 and the motion track caused by the normal pressure of the garbage on the push plate 900, the weight of the push plate 900, and the reaction force of the garbage being pushed out below the push plate 900, etc.); A1 is the cross-sectional area of ​​the rodless chamber of the push plate cylinder; F2 is the maximum external force exerted on each stage of the cylinder during the extension of the push shovel 800 (including the normal pressure of the garbage inside the container on the push shovel 800, the frictional force caused by the garbage and the inner wall of the container, and the frictional force generated on the track caused by the weight of the push shovel 800, etc.). A2 is the cross-sectional area of ​​the rodless chamber of each stage of the pusher cylinder 200 (currently, the pusher cylinder 200 in mainstream products is a multi-stage cylinder; P3 should calculate the ratio of the maximum external force on each stage of the cylinder to the cross-sectional area of ​​the rodless chamber of each stage, and take the maximum value); F3 is the external force on the pusher plate 900 during the retraction process (including the friction of the pusher plate 900's motion guide rail, the self-weight of the pusher plate 900, etc.); A3 is the cross-sectional area of ​​the rod chamber of the pusher cylinder 300. The setting of the sequence valve pressure can be calculated according to the actual situation to determine the value range, and then set to ensure that the sequential action is performed normally. 系统 The set pressure for the system relief valve 402 of the hydraulic unloading system.

[0107] To achieve the above objectives, the present invention provides a compressed garbage truck, wherein the compressed garbage truck includes the hydraulic unloading system for compressed garbage trucks described above. Since the compressed garbage truck adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0108] Specifically, please see again Figure 1 and Figure 2 The compressed garbage truck also includes a chassis frame 600 and a garbage container 700. The bottom plate 701 of the garbage container 700 forms a garbage hopper 702 at its rear end. A pusher slide rail is provided inside the garbage container 700. The pusher 800 is movably mounted on the pusher slide rail and driven by the pusher cylinder 200. The pusher cylinder 200 is a multi-stage cylinder. The pusher plate 900 is vertically mounted on the pusher 800 and driven by the pusher plate cylinder 300 on the pusher 800. More specifically, the pusher 800 is provided with a motion track for the pusher plate 900 to move up and down. There can be two pusher cylinders 300, which are located at both ends of the pusher plate 900.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] Although embodiments of the present invention have been shown and 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 unloading system for a compression refuse vehicle, comprising: The utility model relates to a compression type garbage truck hydraulic unloading system, which comprises the following: An oil driving device (100) is provided with an oil inlet oil way (102) and an oil return oil way (103); A push shovel oil cylinder (200) is used to drive a push shovel (800); A push plate oil cylinder (300) is arranged on the push shovel (800) and is used to drive a push plate (900); An oil driving directional control valve (400) is provided with a first working oil port (A) and a second working oil port (B), the first working oil port (A) is communicated with the rodless cavity of the push shovel oil cylinder (200) and the push plate oil cylinder (300) respectively, the second working oil port (B) is communicated with the rod cavity of the push shovel oil cylinder (200) and the push plate oil cylinder (300) respectively, the oil driving directional control valve (400) is used to switch and select one of the first working oil port (A) and the second working oil port (B) to be communicated with the oil inlet oil way (102) and the other to be communicated with the oil return oil way (103); A floating directional control valve (500) is arranged on the branch oil way communicated between the first working oil port (A) and the rodless cavity of the push plate oil cylinder (300), and is used to switch and select one of the first working oil port (A) and the oil return oil way (103) to be communicated with the rodless cavity of the push plate oil cylinder (300), the second oil inlet port of the floating directional control valve (500) is communicated with the first working oil port (A), the third working oil port of the floating directional control valve (500) is communicated with the rodless cavity of the push plate oil cylinder (300), and the second oil return port of the floating directional control valve (500) is communicated with the oil return oil way (103), the floating directional control valve (500) is used to control the second oil inlet port to switch to the second oil return port and the third working oil port to be communicated in the case that the push plate (900) moves to the bottom of a garbage hopper (702), so that the push plate oil cylinder (300) is in a floating state in the case that the rod cavity is communicated with the oil return oil way (103) through the oil driving directional control valve (400); The compression type garbage truck hydraulic unloading system further comprises a control device and a position detection device (801) used to detect the position of the push shovel (800), and the control device is configured to: In the case that the push plate (900) moves to the arrival position S1, the oil driving device (100) is controlled to reduce the oil driving amount; In the case that the push plate (900) moves to the arrival position S2, the floating directional control valve (500) is controlled to be powered on, so that the second oil inlet port switches to the second oil return port and the third working oil port to be communicated; In the case that the push plate (900) moves to the arrival position S3, the floating directional control valve (500) is controlled to be powered off, so that the second oil return port switches to the second oil inlet port and the third working oil port to be communicated again.

2. The compacted refuse truck hydraulic unloading system of claim 1, wherein, The hydraulic unloading system of the compression garbage truck further comprises a first sequence valve (201) and a second sequence valve (202), the first sequence valve (201) is arranged on a branch oil path through which the first working oil port (A) communicates with a rodless cavity of the push shovel oil cylinder (200), and the second sequence valve (202) is arranged on a branch oil path through which the second working oil port (B) communicates with a rod cavity of the push shovel oil cylinder (200).

3. The compacted refuse truck hydraulic unloading system of claim 1, wherein, A pressure reducing valve (301) is further arranged on a branch oil path through which the first working oil port (A) communicates with a rodless cavity of the push plate oil cylinder (300), and the pressure reducing valve (301) is located between the first working oil port (A) and the floating directional valve (500).

4. The compacted refuse vehicle hydraulic unloading system of claim 1, wherein, The hydraulic unloading system of the compression garbage truck further comprises an overload valve (401), one end of the overload valve (401) is connected to a main oil path through which the first working oil port (A) respectively communicates with the push shovel oil cylinder (200) and the push plate oil cylinder (300), and the other end of the overload valve (401) is connected to the oil return oil path (103).

5. The hydraulic unloading system of a compression-type refuse vehicle according to any one of claims 1 to 4, characterized in that, The oil driving device (100) comprises an oil tank (101), an oil pump assembly (104), an oil suction filter (105) and an oil return filter (106), the oil tank (101) is divided into the oil inlet oil path (102) and the oil return oil path (103), the oil suction filter (105) and the oil pump assembly (104) are arranged on the oil inlet oil path (102), and the oil return filter (106) is arranged on the oil return oil path (103).

6. A hydraulic unloading method of a compression-type garbage truck, characterized by, The hydraulic unloading method of the compression garbage truck is applied to the hydraulic unloading system of the compression garbage truck according to any one of claims 1 to 5, and comprises: controlling the oil driving directional valve (400) to switch to a state in which the first working oil port (A) communicates with the oil inlet oil path (102) and the second working oil port (B) communicates with the oil return oil path (103), so that the push plate oil cylinder (300) and the push shovel oil cylinder (200) both perform an extension action; when it is determined that the push plate (900) moves to the bottom of the garbage hopper (702), controlling the floating directional valve (500) to switch from the first working oil port (A) to the oil return oil path (103) to communicate with the rodless cavity of the push plate oil cylinder (300), so that the rodless cavity and the rod cavity of the push plate oil cylinder (300) both communicate with the oil return oil path (103); when it is determined that the push plate (900) moves away from the garbage hopper (702), controlling the floating directional valve (500) to switch from the oil return oil path (103) to the first working oil port (A) to re-communicate with the rodless cavity of the push plate oil cylinder (300); when it is determined that the push shovel (800) moves to a preset unloading position, controlling the oil driving directional valve (400) to switch to a state in which the second working oil port (B) communicates with the oil inlet oil path (102) and the first working oil port (A) communicates with the oil return oil path (103), so that the push plate oil cylinder (300) and the push shovel oil cylinder (200) both perform a retraction action.

7. The hydraulic unloading method of a compression-type garbage truck according to claim 6, wherein The hydraulic unloading method of the compression garbage truck further comprises: In a case where it is determined that the push plate (900) is about to enter the garbage chute (702), the control oil displacement device (100) is controlled to reduce the oil displacement flow.

8. The hydraulic unloading method of a compression-type garbage truck according to claim 6, wherein The control oil displacement directional valve (400) is switched to a state where the first working oil port (A) is communicated with the oil inlet oil line (102) and the second working oil port (B) is communicated with the oil return oil line (103), so that the push plate oil cylinder (300) and the push shovel oil cylinder (200) are controlled to perform the extension action. The control oil displacement directional valve (400) is switched to a state where the first working oil port (A) is communicated with the oil inlet oil line (102) and the second working oil port (B) is communicated with the oil return oil line (103). The push plate oil cylinder (300) and the push shovel oil cylinder (200) are controlled to perform the extension action under the action of the first sequence valve (201), wherein the first sequence valve (201) is arranged on a branch oil line in which the first working oil port (A) is communicated with the rodless cavity of the push shovel oil cylinder (200).

9. The hydraulic unloading method of a compacting garbage truck according to claim 6, wherein, In a case where it is determined that the push plate (900) is about to enter the garbage chute (702), the control oil displacement device (100) is controlled to reduce the oil displacement flow. In a case where it is determined that the push plate (900) is about to enter the garbage chute (702), the control oil displacement directional valve (400) is switched to a state where the second working oil port (B) is communicated with the oil inlet oil line (102) and the first working oil port (A) is communicated with the oil return oil line (103). In a case where it is determined that the push plate (900) is about to enter the garbage chute (702), the control oil displacement directional valve (400) is switched to a state where the second working oil port (B) is communicated with the oil inlet oil line (102) and the first working oil port (A) is communicated with the oil return oil line (103).

10. A compression refuse vehicle characterized by, The push plate oil cylinder (300) and the push shovel oil cylinder (200) are controlled to perform the retraction action under the action of the second sequence valve (202), wherein the second sequence valve (202) is arranged on a branch oil line in which the second working oil port (B) is communicated with the rod cavity of the push shovel oil cylinder (200). The compression type garbage truck comprises the compression type garbage truck hydraulic unloading system according to any one of claims 1 to 5.

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