CN110758952A

CN110758952A - Hydraulic control system and garbage truck

Info

Publication number: CN110758952A
Application number: CN201810848216.1A
Authority: CN
Inventors: 何锡阳; 聂才刚; 卓圣翔; 潘洪明; 姜振兴
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2020-02-07

Abstract

The invention discloses a hydraulic control system and a garbage truck, wherein the hydraulic control system comprises: the hydraulic cylinder comprises a cylinder body and a piston rod. According to the hydraulic control system, the energy accumulator and the switching assembly are arranged. When the switching component is in the first flow state, the hydraulic oil in the rodless cavity can flow into the energy accumulator to store and accumulate energy; when the switching assembly is in the second flow-through state, hydraulic oil in the accumulator can flow into the rodless chamber, so that the rodless chamber can generate pressure for compressing the piston rod towards the rod chamber. Therefore, the tail door can be firmly closed, the defect of looseness of the tail door is effectively overcome, and the running stability and reliability of the garbage truck are improved.

Description

Hydraulic control system and garbage truck

Technical Field

The invention relates to the technical field of vehicles, in particular to a hydraulic control system and a garbage truck.

Background

The back door of the sanitation vehicle is generally controlled by a hydraulic system, and the opening and closing of the back door are controlled by an oil cylinder and a connecting rod mechanism. The rear door is closed and then the garbage and the sewage in the garbage can are sealed, the sealing strip is sealed between the rear door and the box body, and the sealing strip is compressed after the rear door is closed, so that the sealing strip has a certain compression amount to achieve a sealing effect.

However, since the actuator of the rear door is a component of the hydraulic cylinder and the hydraulic system, the hydraulic components all have internal leakage, and as long as there is leakage in the hydraulic system, the rigidity of the cylinder will be reduced (i.e. the piston rod of the cylinder may have elasticity), which may cause the compression amount of the seal strip to change and cause leakage. In the transportation process of the sanitation truck, the rear door can be loosened due to working conditions such as road bumping, vibration, acceleration and deceleration, garbage impact in the tank and the like, so that the garbage, sewage and the like are leaked, and the environmental pollution is formed.

After the leakage phenomenon occurs, in the related art, the processing method is to use a more precise hydraulic component (a component with a small internal leakage amount and high reliability) or replace the component, which causes the disadvantages of low service life and high cost of the component.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a hydraulic control system which has the advantages of high reliability and low cost.

The invention further provides a garbage truck which comprises the hydraulic control system.

According to the hydraulic control system of the embodiment of the present invention, the hydraulic control system includes: the oil cylinder comprises a cylinder body and a piston rod, and the piston rod is arranged in the cylinder body in a reciprocating manner to divide the cylinder body into a rodless cavity and a rod cavity; the reversing valve is provided with a first state, an intermediate state and a second state, the reversing valve is provided with an oil inlet, an oil return port, a first oil port and a second oil port, the oil inlet is connected with an output port of a pump body, the pump body is connected with an oil tank, the oil return port is communicated with the oil tank, the oil inlet is communicated with the second oil port in a switching mode when the reversing valve is in the first state, the oil return port is communicated with the first oil port, the oil inlet is communicated with the first oil port when the reversing valve is in the second state, the oil return port is communicated with the second oil port, and the first oil port and the second oil port are communicated with the oil return port when the reversing valve is switched to the intermediate state; the hydraulic lock comprises a valve body and two one-way valve cores, two hydraulic oil paths are arranged in the valve body, the first ends of the two hydraulic oil paths are respectively connected with the first oil port and the second oil port, the second ends of the two hydraulic oil paths are respectively connected with the rodless cavity and the rod cavity, each one-way valve core corresponds to one hydraulic oil path, the one-way valve cores can move to conduct or cut off the hydraulic oil paths on the corresponding sides, the hydraulic lock is constructed in a way that when one of the hydraulic oil paths is fed with oil to push the one-way valve core on the corresponding side to move, the other one-way valve core synchronously moves, and the two hydraulic oil paths are conducted; the oil way interface of the energy accumulator is connected with the rodless cavity through a first channel; a switching assembly configured to switch between a first flow-through state in which hydraulic oil flows to the accumulator and a second flow-through state in which hydraulic oil within the accumulator flows to the rodless chamber, the switching assembly being connected in series on the first passage.

According to the hydraulic control system provided by the embodiment of the invention, the energy accumulator and the switching assembly are arranged. When the switching component is in the first flow state, the hydraulic oil in the rodless cavity can flow into the energy accumulator to store and accumulate energy; when the switching assembly is in the second flow-through state, hydraulic oil in the accumulator can flow into the rodless chamber, so that the rodless chamber can generate pressure for compressing the piston rod towards the rod chamber. Therefore, the tail door can be firmly closed, the defect of looseness of the tail door is effectively overcome, and the running stability and reliability of the garbage truck are improved.

According to some embodiments of the invention, the switching assembly is a two-position two-way solenoid valve.

In some embodiments of the invention, further comprising a first control valve in parallel with the switching assembly, the first control valve having an open or closed state.

According to some embodiments of the invention, the oil passage port of the accumulator is connected to the oil tank through a second passage, and a second control valve having an open-close state is connected in series to the second passage.

In some embodiments of the invention, one end of the second passage is connected to the first oil port.

According to some embodiments of the invention, a flow regulating valve is connected in series between at least one of the two hydraulic oil paths and the oil cylinder.

In some embodiments of the present invention, the flow regulating valve is connected in series between each hydraulic oil path and the oil cylinder.

According to some embodiments of the invention, each of the flow regulating valves includes a check valve and a throttling element arranged in parallel, the check valve controlling one-way flow of hydraulic oil to the cylinder.

In some embodiments of the present invention, the pump further comprises a detection device for detecting the oil storage amount of the accumulator, and the pump body is controlled to operate when the detection device detects that the hydraulic oil in the accumulator is lower than a set value.

According to some embodiments of the invention, the detection device is a pressure detection device.

In some embodiments of the present invention, the pump further comprises an overflow valve, and the overflow valve is respectively communicated with the pump body and the oil tank.

According to some embodiments of the invention, the reversing valve has a manual switch that controls the reversing valve switching state when activated.

The garbage truck according to the embodiment of the invention comprises: the car body is provided with a rotatable tail gate; the oil tank is arranged on the vehicle body and is connected with the pump body; the hydraulic control system is the above hydraulic control system, and the piston rod is connected with the tail gate to drive the tail gate to rotate.

According to the garbage truck provided by the embodiment of the invention, the opening and closing of the tail door can be conveniently and reliably controlled through the hydraulic control system. But also by providing an accumulator and a switching assembly. When the switching component is in the first flow state, the hydraulic oil in the rodless cavity can flow into the energy accumulator to store and accumulate energy; when the switching assembly is in the second flow-through state, hydraulic oil in the accumulator can flow into the rodless chamber, so that the rodless chamber can generate pressure for compressing the piston rod towards the rod chamber. Therefore, the tail door can be firmly closed, the defect of looseness of the tail door is effectively overcome, and the running stability and reliability of the garbage truck are improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a hydraulic control system according to an embodiment of the invention, wherein a reversing valve is in a first state, and the hydraulic control system drives a tail door of a garbage truck to open;

FIG. 2 is a schematic structural diagram of a hydraulic control system according to an embodiment of the present invention, wherein the reversing valve is in a second state, and the hydraulic control system drives the tail door of the garbage truck to close;

FIG. 3 is a schematic diagram of a hydraulic control system according to an embodiment of the present invention, wherein the directional control valve is in an intermediate state and the hydraulic control system is in a non-actuated state;

FIG. 4 is a schematic structural diagram of a hydraulic control system according to an embodiment of the present invention, wherein the hydraulic control system is in a locking operating state;

FIG. 5 is a schematic structural diagram of a garbage truck according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a hydraulic lock according to an embodiment of the present invention, wherein the hydraulic lock is in a locked state;

FIG. 7 is a schematic diagram of a hydraulic lock according to an embodiment of the present invention, wherein the P1 port of the hydraulic lock is filled with oil;

fig. 8 is a schematic structural diagram of a hydraulic lock according to an embodiment of the present invention, in which a P2 port of the hydraulic lock is filled with oil.

Reference numerals:

the hydraulic control system 100 is provided with a hydraulic control system,

the cylinder 10, the cylinder body 110, the rodless chamber 111, the rod chamber 112, the piston rod 120,

the directional control valve 20, the oil inlet 210, the oil return port 220, the first oil port 230, the second oil port 240,

the hydraulic lock 30, the valve body 310, the body 3101, the end cover 3102, the hydraulic oil path 311, the check valve core 320, the main body 321, the tapered part 322, the middle cavity 330, the first cavity 3301, the second cavity 3302, the middle valve core 331, the valve cavity 340, the first elastic piece 3431, the communication opening 360, the stop piece 370, the left first oil through port P1, the right first oil through port P2, the left second oil through port T1, the right second oil through port T2,

the accumulator 40, the oil passage interface 401, the first passage 410, the switching assembly 411, the first control valve 412, the second passage 420, the second control valve 421, the detection device 430,

the flow regulating valve 50, the check valve 510, the throttling element 520,

the garbage truck 800, the truck body 810, the tail gate 811, the oil tank 812, the pump body 813 and the overflow valve 814.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The hydraulic control system 100 and the garbage truck 800 according to the embodiment of the present invention are described below with reference to fig. 1 to 8.

As shown in fig. 1 and 5, according to the hydraulic control system 100 of the embodiment of the present invention, the hydraulic control system 100 may be used to control the opening and closing of the rear door 811 of the garbage truck 800. The garbage truck 800 comprises an oil tank 812 and a pump body 813, wherein the pump body 813 is connected with the oil tank 812. The pump body 813 may be used as a power source to pump hydraulic oil from the oil tank 812 into the hydraulic control system 100.

As shown in fig. 1 to 4, the hydraulic control system 100 includes: a cylinder 10, a directional valve 20, a hydraulic lock 30, an accumulator 40, and a switching assembly 411.

Specifically, as shown in fig. 1 and 5, the cylinder 10 includes a cylinder body 110 and a piston rod 120, and the piston rod 120 is reciprocally disposed within the cylinder body 110 to divide the interior of the cylinder body 110 into a rodless chamber 111 and a rod chamber 112. The piston rod 120 may be connected to the rear gate 811. Thus, when the piston rod 120 reciprocates within the cylinder 110, the piston rod 120 may drive the rear door 811 to open or close.

As shown in fig. 1 to 4, the direction valve 20 has a first state, an intermediate state and a second state, the direction valve 20 has an oil inlet 210, an oil return port 220, a first oil port 230 and a second oil port 240, the oil inlet 210 is connected to an output port of the pump body 813, and the oil return port 220 is communicated with an oil tank 812. Thus, hydraulic oil in the oil tank 812 can be pumped from the oil inlet 210 into the selector valve 20 through the pump body 813. The hydraulic oil flowing out through the selector valve 20 can be returned to the oil tank 812 via the oil return port 220.

As shown in fig. 1 and 2, when the direction valve 20 is switched between the first state and the second state, the oil inlet 210 is switched to be communicated with the first oil port 230 and the second oil port 240. As shown in fig. 1, when the reversing valve 20 is in the first state, the oil inlet 210 is communicated with the second oil port 240, and the oil return port 220 is communicated with the first oil port 230; as shown in fig. 2, when the directional valve 20 is in the second state, the oil inlet 210 is in communication with the first oil port 230, and the oil return 220 is in communication with the second oil port 240. As shown in fig. 3, when the direction valve 20 is switched to the neutral state, both the first port 230 and the second port 240 communicate with the oil return port 220.

As shown in fig. 1, 6-8, the hydraulic lock 30 includes: the valve body 310 is internally provided with two hydraulic oil paths 311, first ends of the two hydraulic oil paths 311 are respectively connected with the first oil port 230 and the second oil port 240, and second ends of the two hydraulic oil paths 311 are respectively connected with the rodless cavity 111 and the rod cavity 112. As shown in fig. 1 to 4, a first end of the hydraulic oil passage 311 located on the left side is connected to the first oil port 230, and a second end thereof is communicated with the rodless chamber 111; the hydraulic oil passage 311 on the right has a first end connected to the second oil port 240 and a second end communicated with the rod chamber 112.

As shown in fig. 1, when the directional valve 20 is in the first state, the oil inlet 210 communicates with the second oil port 240, and the oil return 220 communicates with the first oil port 230. At this time, the hydraulic oil in the oil tank 812 may be pumped into the oil inlet 210 through the pump body 813, and flow into the right hydraulic oil passage 311 through the second oil port 240, and the hydraulic oil flows into the rod chamber 112 through the right hydraulic oil passage 311. Thereby causing the pressure within the rod chamber 112 to increase. The hydraulic oil in the rod chamber 112 pushes the piston rod 120 towards the rod-less chamber 111. As shown in fig. 5, when the piston rod 120 moves from the rod chamber 112 to the rod-less chamber 111, the piston rod 120 can pull the end gate 811 to rotate open. Thereby, an operation of the hydraulic control system 100 to control the opening of the back door 811 is realized.

As shown in fig. 2, when the directional valve 20 is in the second state, the oil inlet 210 is in communication with the first oil port 230, and the oil return 220 is in communication with the second oil port 240. At this time, the hydraulic oil in the oil tank 812 may be pumped into the oil inlet 210 through the pump body 813, and flow into the left hydraulic oil passage 311 through the first oil port 230, and the hydraulic oil flows into the rodless chamber 111 through the left hydraulic oil passage 311. Thereby, the pressure in the rodless chamber 111 is increased. The hydraulic oil in the rodless chamber 111 pushes the piston rod 120 toward the rod chamber 112. As shown in connection with FIG. 5, when piston rod 120 moves from rodless cavity 111 in the direction of rodless cavity 112, piston rod 120 may push end gate 811 to rotate closed. Thereby, an operation of the hydraulic control system 100 to control the closing of the back door 811 is achieved.

Referring to fig. 1, 6-8, each check valve core 320 corresponds to one hydraulic oil path 311, the check valve core 320 is movable to open or close the corresponding hydraulic oil path 311, and the hydraulic lock 30 is configured such that when one of the hydraulic oil paths 311 takes oil to push the corresponding check valve core 320 to move, the other check valve core 320 moves synchronously, and the two hydraulic oil paths 311 are opened. That is, when the hydraulic oil enters one of the hydraulic oil passages 311, the other hydraulic oil passage 311 may be brought into conduction. Thereby, hydraulic oil flow control within the hydraulic control system 100 is facilitated.

As shown in fig. 1, the oil passage port 401 of the accumulator 40 is connected to the rodless chamber 111 through a first passage 410. The switching member 411 is configured to switch between a first flow-through state in which the hydraulic oil flows to the accumulator 40 and a second flow-through state in which the hydraulic oil in the accumulator 40 flows to the rodless chamber 111, the switching member 411 being connected in series on the first passage 410.

It should be noted that when the hydraulic control system 100 is in the non-operating state, the pump body 813 is in the non-operating state. At this time, the hydraulic lock 30 is in a locked state, and the cylinder 10 and the tank 812 are in a disconnected state. At this time, the hydraulic oil in the cylinder 10 cannot move, and the tail gate 811 cannot be opened and closed.

When the hydraulic control system 100 has a leak failure, the tail gate 811 is in a loose state. By providing the accumulator 40, hydraulic oil can flow from the rodless chamber 111 into the accumulator 40 to store the accumulator when the switch assembly 411 is in the first flow-through state. When the switch assembly 411 is in the second flow-through state, hydraulic oil within the accumulator 40 may flow from the accumulator 40 to the rodless chamber 111, thereby compressing the piston rod 120 toward the rod chamber 112. Therefore, the tail door 811 can be firmly closed, the looseness of the tail door 811 is effectively avoided, and the running stability of the garbage truck 800 is improved.

The hydraulic control system 100 of the tail gate 811 of the garbage truck 800 according to the embodiment of the present invention is provided with the accumulator 40 and the switching assembly 411. When the switching assembly 411 is in the first flow-through state, the hydraulic oil in the rodless cavity 111 can flow into the accumulator 40 to be stored and accumulated; when the switch assembly 411 is in the second flow-through state, hydraulic oil in the accumulator 40 may flow into the rodless chamber 111, and thus the rodless chamber 111 may generate a pressure that compresses the piston rod 120 toward the rod chamber 112. Therefore, the tail door 811 can be firmly closed, the defect of looseness of the tail door 811 is effectively prevented, and the running stability and reliability of the garbage truck 800 are improved.

According to some embodiments of the invention, the switching assembly 411 may be a two-position two-way solenoid valve. It should be noted that, the switching assembly 411 is a two-position two-way solenoid valve, which can conveniently and reliably control the switching of the switching assembly 411 between the first flow-through state and the second flow-through state.

In some embodiments of the present disclosure, as shown in fig. 1-4, hydraulic control system 100 may further include a first control valve 412 in parallel with switching assembly 411, first control valve 412 having an open or closed state. Thus, when the switching assembly 411 malfunctions, the communication and disconnection between the accumulator 40 and the rodless chamber 111 may be controlled by the first control valve 412. For example, when the switching assembly 411 malfunctions, the communication between the accumulator 40 and the rodless chamber 111 may be controlled by the first control valve 412, and the hydraulic oil in the accumulator 40 may flow to the rodless chamber 111. Therefore, the rear door 811 can be ensured not to be loosened when the switching assembly 411 breaks down, and the running stability and reliability of the garbage truck 800 are improved.

According to some embodiments of the present invention, as shown in fig. 1 to 4, the oil passage interface 401 of the accumulator 40 is connected to the oil tank 812 through the second passage 420, and the second control valve 421 having an open/close state is connected in series to the second passage 420. It should be noted that, when the accumulator 40 needs to be depressurized, the second control valve 421 may be opened to discharge the hydraulic oil in the accumulator 40 into the oil tank 812, so that the hydraulic oil pressure relief device is simple in structure and convenient and reliable to control.

In some embodiments of the present invention, as shown in fig. 1-4, one end of the second passage 420 may be connected to the first oil port 230. Accordingly, the hydraulic oil in the accumulator 40 may flow from the first oil port 230 into the direction valve 20 through the second passage 420, and flow into the oil tank 812 through the direction valve 20, so as to release the pressure of the accumulator 40.

According to some embodiments of the present invention, as shown in fig. 1 to 4, a flow regulating valve 50 is connected in series between at least one of the two hydraulic oil paths 311 and the cylinder 10. That is, the flow rate adjustment valve 50 may be provided in one of the two hydraulic fluid passages 311, or the flow rate adjustment valve 50 may be provided in both of the two hydraulic fluid passages 311. The flow rate adjusting valve 50 can adjust the flow rate of the hydraulic passage 311, and can control the opening or closing speed of the tailgate 811. Therefore, the control of the tail door 811 of the garbage truck 800 can be more flexible and convenient.

In some embodiments of the present invention, as shown in fig. 1 to 4, a flow rate regulating valve 50 is connected in series between each hydraulic oil path 311 and the cylinder 10. Thus, each hydraulic passage 311 can regulate and control the flow rate through the corresponding flow rate regulating valve 50. Thus, the convenience and reliability of the hydraulic control system 100 in controlling the opening or closing rate of the tail gate 811 may be improved.

According to some embodiments of the present invention, as shown in fig. 1-4, each flow regulating valve 50 may include a check valve 510 and a throttling element 520 arranged in parallel, the check valve 510 controlling one-way flow of hydraulic oil to the cylinder 10. It should be noted that when hydraulic oil is fed from the hydraulic lock 30 to the cylinder block 110, hydraulic oil can flow from the oil feed branch provided with the check valve 510. Therefore, the reverse flow of the hydraulic oil can be avoided, and the stability and the running reliability of the hydraulic control system 100 are improved. When the hydraulic oil is returned from the cylinder block 110 to the hydraulic lock 30, the hydraulic oil may flow from the return branch provided with the restriction member 520. Thus, the restriction element 520 can controllably adjust the flow of hydraulic oil, thereby adjusting the opening or closing speed of the tail gate 811.

It should be noted that, a large amount of heat is generated after the hydraulic oil is throttled by the throttling element 520, and if the throttling element 520 is disposed on the oil inlet branch, the oil cylinder 10 is affected or even damaged. The throttle element 520 is disposed on an oil return branch of the cylinder block 110 flowing to the hydraulic lock 30, and the high-temperature hydraulic oil after passing through the throttle element 520 can flow into the oil tank 812 to be cooled.

In some embodiments of the present invention, as shown in fig. 1 to 4, the hydraulic control system 100 may further include a detection device 430 for detecting an amount of oil stored in the accumulator 40, and the pump body 813 is controlled to operate when the detection device 430 detects that the hydraulic oil in the accumulator 40 is lower than a set value. It will be appreciated that by providing the sensing device 430, the amount of oil in the accumulator 40 can be effectively and accurately controlled, and thus the reliability of the closure of the tailgate 811 can be effectively maintained.

According to some embodiments of the invention, the detection device 430 may be a pressure detection device 430. Thus, the amount of hydraulic oil in the accumulator 40 can be detected and controlled by the pressure detection device 430. Moreover, the use of the pressure detection device 430 may reduce the production cost of the hydraulic control system 100.

In some embodiments of the present invention, as shown in fig. 1-4, the hydraulic control system 100 may further include a relief valve 814, the relief valve 814 being in communication with the pump body 813 and the tank 812, respectively. It should be noted that the relief valve 814 may play a role in constant pressure relief, pressure stabilization, and system unloading protection for the hydraulic control system 100. For example, the spill valve 814 may be closed during normal operation of the hydraulic control system 100. When the hydraulic control system 100 is loaded beyond a specified limit (the system pressure exceeds a predetermined pressure), the relief valve 814 may open to relieve and protect against an overload such that the system pressure does not increase. Thereby, the stability and safety of the operation of the hydraulic control system 100 are improved.

According to some embodiments of the present invention, the reversing valve 20 has a manual switch that controls the reversing valve 20 to switch states when activated. It should be noted that the directional valve 20 can be switched between the first state, the second state and the intermediate state in the power supply state. When the direction valve 20 is out of order, the operating state of the direction valve 20 can be switched by the manual switching piece. Thus, the stability and reliability of the operation of the hydraulic control system 100 are improved.

As shown in fig. 5, according to a garbage truck 800 of an embodiment of the present invention, the garbage truck 800 includes: a vehicle body 810, a tank 812, and the hydraulic control system 100. The vehicle body 810 is provided with a rotatable tail gate 811, the oil tank 812 is arranged on the vehicle body 810, the oil tank 812 is connected with the pump body 813, the hydraulic control system 100 is the hydraulic control system 100, and the piston rod 120 is connected with the tail gate 811 to drive the tail gate 811 to rotate.

According to the garbage truck 800 of the embodiment of the invention, the opening and closing of the tail door 811 can be conveniently and reliably controlled by the hydraulic control system 100. But also by providing an accumulator 40 and a switching assembly 411. When the switching assembly 411 is in the first flow-through state, the hydraulic oil in the rodless cavity 111 can flow into the accumulator 40 to be stored and accumulated; when the switch assembly 411 is in the second flow-through state, hydraulic oil in the accumulator 40 may flow into the rodless chamber 111, and thus the rodless chamber 111 may generate a pressure that compresses the piston rod 120 toward the rod chamber 112. Therefore, the tail door 811 can be firmly closed, the defect of looseness of the tail door 811 is effectively prevented, and the running stability and reliability of the garbage truck 800 are improved.

A garbage truck 800 according to an embodiment of the present invention will be described in detail in a specific embodiment with reference to fig. 1 to 8. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.

As shown in fig. 1 and 5, a rear door 811 is provided at the rear end of a vehicle body 810 of the garbage truck 800, and an oil tank 812, a pump body 813, and the hydraulic control system 100 are provided on the vehicle body 810. The pump body 813 is connected to the oil tank 812 as a power source of the hydraulic control system 100. A relief valve 814 is connected to the tank 812 and the pump body 813 to protect the hydraulic control system 100. The piston rod 120 of the hydraulic control system 100 is coupled to the rear door 811 to drive the rotation of the rear door 811 to open or close the rear door 811.

As shown in fig. 1, the hydraulic control system 100 includes: a cylinder 10, a directional valve 20, a hydraulic lock 30, an accumulator 40 and a switching assembly. The oil cylinder 10 includes: a cylinder 110 and a piston rod 120, the piston rod 120 being reciprocally movably provided within the cylinder 110 to divide the interior of the cylinder 110 into a rodless chamber 111 and a rod chamber 112.

As shown in fig. 1, the rodless chamber 111 is connected to the accumulator 40 through a first passage 410, and a switching assembly 411 and a first control valve 412 are provided on the first passage 410. The switching member 411 is a two-position two-way solenoid valve, and the two-position two-way solenoid valve can be switched between a first flow-through state in which hydraulic oil flows to the accumulator 40 and a second flow-through state in which hydraulic oil in the accumulator 40 flows to the rodless chamber 111. The accumulator 40 is connected with a pressure detection device 430, and when the detection device detects that the hydraulic oil in the accumulator 40 is lower than a set value, the pump body 813 is controlled to operate.

The directional valve 20 is a three-position, four-way directional valve 20, and the directional valve 20 has an oil inlet 210, an oil return 220, a first oil port 230, and a second oil port 240. Wherein, the oil inlet 210 is connected with the output port of the pump body 813, and the oil return port 220 is communicated with the oil tank 812. The first port 230 communicates with the rodless chamber 111 and the second port 240 communicates with the rod chamber 112.

The directional valve 20 has a first state, an intermediate state, and a second state. As shown in fig. 1, when the directional valve 20 is in the first state, the oil inlet 210 is communicated with the second oil port 240, and the oil return 220 is communicated with the first oil port 230; as shown in fig. 2, when the directional valve 20 is in the second state, the oil inlet 210 is communicated with the first oil port 230, and the oil return port 220 is communicated with the second oil port 240; as shown in fig. 3, when the direction valve 20 is in the half-neutral state, both the first port 230 and the second port 240 communicate with the oil return port 220.

As shown in fig. 1, 6-8, the hydraulic lock 30 includes: a valve body 310, two one-way spools 320, and an intermediate spool 331. The hydraulic lock 30 has two hydraulic oil passages 311 and two pilot oil passages 312, and the first end of the left hydraulic oil passage 311 is connected to the first port 230, and the second end is connected to the rodless chamber 111. The first end of one hydraulic oil path 311 on the right side is connected to the second oil port 240, and the second end is connected to the rod chamber 112.

A flow rate regulating valve 50 is connected in series between the two hydraulic oil passages 311 and the cylinder 10. As shown in fig. 1, the flow regulating valve 50 includes a check valve 510 and a throttling element 520 connected in parallel. The throttling element 520 is disposed on the oil return branch, and the check valve 510 is disposed on the oil inlet branch to control the hydraulic oil to flow to the oil cylinder 10 in a single direction. The accumulator 40 is connected to the first port 230 through a second passage 420, and the second passage 420 is provided with a second control valve 421.

As shown in fig. 1, 6 to 8, the valve body 310 includes a body portion 3101 and two end covers 3102, the body portion 3101 is formed in a cylindrical shape with both ends open, and a portion of each end cover 3102 extends into the body portion 3101 to be interference-connected with the body portion 3101 to seal the open end of the body portion 3101. Each end cap 3102 is provided with a cylindrical boss on the side facing the body portion 3101. The valve body 310 is provided with a middle cavity 330 and two valve cavities 340, and the two valve cavities 340 are respectively positioned at two sides of the middle cavity 330. Each valve chamber 340 communicates with the intermediate chamber 330 through a communication opening 360.

As shown in fig. 1, 6-8, the intermediate spool 331 is movably disposed within the intermediate chamber 330, and the intermediate spool 331 cooperates with the intermediate chamber 330 to divide the intermediate chamber 330 into a first cavity 3301 and a second cavity 3302 that are not in communication with each other. The first cavity 3301 communicates with one valve chamber 340 through one communication opening 360, and the second cavity 3302 communicates with the other valve chamber 340 through the other communication opening 360. A first oil passage (a left first oil passage P1) is provided in the valve body 310 corresponding to the first cavity 3301, and the left first oil passage P1 penetrates the wall surface of the valve body 310. The valve body 310 corresponding to the second cavity 3302 is also provided with a first oil passage (right first oil passage P2) through which the right first oil passage P2 penetrates the wall surface of the valve body 310. The valve body 310 corresponding to the two valve cavities is correspondingly provided with a second oil through port (a left second oil through port T1/a right second oil through port T2), and the second oil through port (a left second oil through port T1/a right second oil through port T2) penetrates through the pipe wall of the valve body 310 to form a hydraulic oil path 311.

As shown in fig. 1, the left first port P1 is connected to the first port 230 of the selector valve 20, and the right first port P2 is connected to the second port 240. The left second oil through port T1 is connected with the rodless cavity, and the right second oil through port T2 is connected with the rod cavity.

As shown in fig. 1, 6-8, two check valve spools 320 are respectively disposed in the two valve cavities 340 in a one-to-one correspondence. Each check spool 320 includes a main body portion 3211 and a tapered portion 3212, the tapered portion 3212 being connected to one end of the main body portion 3211, the cross-sectional area of the tapered portion 3212 gradually decreasing in a direction toward the communication opening 360. The cross-sectional area of the body portion 3211 in the moving direction remains unchanged. Each check valve spool 320 is movable within its corresponding valve chamber 340, and the tapered portion 3212 may open or close the communication opening 360 during movement of the check valve spool 320.

As shown in fig. 1, 6-8, the wall surface of the valve cavity 340 is provided with a stop member 370, the stop member 370 is annular, an outer annular wall surface of the stop member 370 is connected to the wall surface of the valve cavity 340, and an inner annular wall surface of the stop member 370 is in close contact with the outer peripheral wall of the main body portion 3211.

As shown in fig. 6-8, each valve chamber 340 is provided with a first elastic member 3431 (e.g., a spring). One end of the first elastic element 3431 abuts against the boss, and the other end of the first elastic element 3431 can extend into the main body 3211 to drive the corresponding one-way valve element 320 to move toward the communication opening 360 to close the communication opening 360.

As shown in fig. 7 and 8, when hydraulic oil is introduced into one of the first oil passing ports (the left first oil passing port P1 and the right first oil passing port P2), the hydraulic oil can flow into the first cavity 3301 or the second cavity 3302 communicated with the first oil passing port (the left first oil passing port P1 and the right first oil passing port P2), the oil pressure formed in the first cavity 3301 or the second cavity 3302 can drive the check valve core 320 in the corresponding communication opening 360 to move, the check valve core 320 can open the corresponding communication opening 360, and the middle valve core 331 can be driven to move to push the other check valve core 320 to move to open the other communication opening 360, so that the two communication openings 360 can be opened simultaneously.

The operation of the hydraulic control system 100 for the rear door 811 of the garbage truck 800 will be described in detail with reference to fig. 1-4.

As shown in conjunction with fig. 1 and 5, when the hydraulic control system 100 controls the opening of the tailgate 811. At this time, the switching member 411 on the first passage 410 is in the first flow-through state, and the first control valve 412 is in the closed state. The second control valve 421 on the second passage 420 is in a closed state. The direction valve 20 is switched to the first state, the oil inlet 210 of the direction valve 20 is communicated with the second oil port 240, and the oil return port 220 of the direction valve 20 is communicated with the first oil port 230. Under the action of the pump body 813, the hydraulic oil in the oil tank 812 flows into the hydraulic oil path 311 on the right side of the hydraulic lock 30 through the oil inlet 210 and the second oil port 240 of the directional control valve 20 in sequence, and flows to the rod chamber 112 through the check valve 510 of the flow control valve 50.

The hydraulic oil in the rod chamber 112 pushes the piston rod 120 towards the rod-less chamber 111 so that the piston rod 120 can pull the tail gate 811 to rotate open. At the same time, the hydraulic oil in the rod-less chamber 111 is pressed out of the rod-less chamber 111. A part of the hydraulic oil flowing out of the rodless chamber 111 flows into the accumulator 40 through the first passage 410, and the other part of the hydraulic oil is flow-controlled through the throttling element 520 of the left flow rate adjustment valve 50, flows to the direction change valve 20 through the left hydraulic oil passage 311, and returns to the oil tank 812 through the first oil port 230 and the oil return port 220 of the direction change valve 20 in sequence. Thus, the hydraulic control system 100 realizes control of opening of the tailgate 811 of the trash vehicle 800.

As shown in conjunction with fig. 2 and 5, when the hydraulic control system 100 controls the closing of the tailgate 811. At this time, the switching assembly on the first passage is in the first flow-through state, and the first control valve is in the closed state. The second control valve 421 on the second passage is in a closed state. The diverter valve 20 switches to the second state. The oil inlet 210 of the directional valve 20 communicates with the first oil port 230, and the oil return port 220 of the directional valve 20 communicates with the second oil port 240. Under the action of the pump body 813, the hydraulic oil in the oil tank 812 sequentially flows into the hydraulic oil path 311 on the left side of the hydraulic lock 30 through the oil inlet 210 and the first oil port 230 of the directional valve 20, and the hydraulic oil is branched into two paths after flowing through the check valve 510 of the flow regulating valve 50 on the left side. One of the branches flows into the accumulator 40 through the first passage 410, and the other branch flows toward the rodless chamber 111.

The hydraulic oil in the rodless chamber 111 forces the piston rod 120 toward the rod chamber 112 so that the piston rod 120 may force the end gate 811 to rotate closed. At the same time, the hydraulic oil in the rod chamber 112 is squeezed out. The hydraulic oil flowing out of the rod chamber 112 is flow-controlled through the throttling element 520 of the right flow rate adjustment valve 50, flows to the direction change valve 20 through the right hydraulic oil passage 311, and returns to the oil tank 812 through the second oil port 240 and the oil return port 220 of the direction change valve 20 in order. Thus, the hydraulic control system 100 controls the closing of the rear door 811 of the trash vehicle 800.

Referring to fig. 3 and 5, when the hydraulic control system 100 is in a non-operating state, i.e., the pump body 813 is not operating. At this time, the switching member 411 on the first passage 410 is in the first flow-through state, and the first control valve 412 is in the closed state. The second control valve 421 on the second passage 420 is in a closed state. Referring to fig. 6, the hydraulic lock 30 is in a locked state, the intermediate spool 331 is in an intermediate position, the two check spools 320 block the corresponding communication openings 360, and the two hydraulic oil paths 311 are in a disconnected state. As shown in fig. 3, at this time, the direction valve 20 is switched to the neutral state, and both the first port 230 and the second port 240 of the direction valve 20 are connected to the tank 812. At this time, the oil cylinder 10 and the oil tank 812 are not communicated with each other, and thus the tailgate 811 cannot be opened or closed.

As shown in fig. 4 and 5, when the hydraulic control system is in the anti-loosening operation state, the second control valve 421 on the second passage 420 is in the closed state. The switching assembly 411 on the first channel 410 is in a first flow-through state, the first control valve 412 is in a closed state; or the second control valve 421 on the second passage 420 is in a closed state. In the event of a failure of the switching assembly 411 on the first channel 410, the first control valve 412 is in an open state. At this time, the hydraulic oil in the accumulator 40 may flow into the rod-less chamber 111 from the first passage 410, so that a pressure is generated in the rod-less chamber 111 to push the piston rod 120 toward the rod-containing chamber 112, and thus the rear door 811 may be in a firmly closed state, and the looseness of the rear door 811 is effectively avoided.

When the pressure of the hydraulic oil in the accumulator 40 needs to be relieved, the second control valve 421 on the second passage 420 may be opened, and the hydraulic oil in the accumulator 40 may flow into the oil tank 812 through the directional valve 20, so as to relieve the pressure of the accumulator 40.

Thus, the opening and closing of the tailgate 811 may be conveniently and reliably controlled by the hydraulic control system 100. But also by providing an accumulator 40 and a switching assembly 411. When the switching assembly 411 is in the first flow-through state, the hydraulic oil in the rodless cavity 111 can flow into the accumulator 40 to be stored and accumulated; when the switch assembly 411 is in the second flow-through state, hydraulic oil in the accumulator 40 may flow into the rodless chamber 111, and thus the rodless chamber 111 may generate a pressure that compresses the piston rod 120 toward the rod chamber 112. Therefore, the tail door 811 can be firmly closed, the defect of looseness of the tail door 811 is effectively prevented, and the running stability and reliability of the garbage truck 800 are improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydraulic control system, characterized by comprising:

the oil cylinder comprises a cylinder body and a piston rod, and the piston rod is arranged in the cylinder body in a reciprocating manner to divide the cylinder body into a rodless cavity and a rod cavity;

the reversing valve is provided with a first state, an intermediate state and a second state, the reversing valve is provided with an oil inlet, an oil return port, a first oil port and a second oil port, the oil inlet is connected with an output port of a pump body, the pump body is connected with an oil tank, the oil return port is communicated with the oil tank, the oil inlet is communicated with the second oil port in a switching mode when the reversing valve is in the first state, the oil return port is communicated with the first oil port, the oil inlet is communicated with the first oil port when the reversing valve is in the second state, the oil return port is communicated with the second oil port, and the first oil port and the second oil port are communicated with the oil return port when the reversing valve is switched to the intermediate state;

the hydraulic lock comprises a valve body and two one-way valve cores, two hydraulic oil paths are arranged in the valve body, the first ends of the two hydraulic oil paths are respectively connected with the first oil port and the second oil port, the second ends of the two hydraulic oil paths are respectively connected with the rodless cavity and the rod cavity, each one-way valve core corresponds to one hydraulic oil path, the one-way valve cores can move to conduct or cut off the hydraulic oil paths on the corresponding sides, the hydraulic lock is constructed in a way that when one of the hydraulic oil paths is fed with oil to push the one-way valve core on the corresponding side to move, the other one-way valve core synchronously moves, and the two hydraulic oil paths are conducted;

the oil way interface of the energy accumulator is connected with the rodless cavity through a first channel;

a switching assembly configured to switch between a first flow-through state in which hydraulic oil flows to the accumulator and a second flow-through state in which hydraulic oil within the accumulator flows to the rodless chamber, the switching assembly being connected in series on the first passage.

2. The hydraulic control system of claim 1, wherein the switching assembly is a two-position, two-way solenoid valve.

3. The hydraulic control system of claim 1, further comprising a first control valve in parallel with the switching assembly, the first control valve having an open or closed state.

4. The hydraulic control system according to claim 1, wherein an oil passage port of the accumulator is connected to an oil tank through a second passage, and a second control valve having an open/close state is connected in series to the second passage.

5. The hydraulic control system of claim 4, wherein one end of the second passage is connected to the first oil port.

6. The hydraulic control system according to claim 1, characterized in that a flow regulating valve is connected in series between the cylinder and at least one of the two hydraulic oil passages.

7. The hydraulic control system according to claim 6, wherein the flow rate adjustment valve is connected in series between each of the hydraulic oil passages and the cylinder.

8. The hydraulic control system of claim 7, wherein each of the flow control valves includes a check valve and a throttling element arranged in parallel, the check valve controlling one-way flow of hydraulic oil to the cylinder.

9. The hydraulic control system according to claim 1, further comprising a detection device for detecting an amount of oil stored in the accumulator, and controlling the pump body to operate when the detection device detects that hydraulic oil in the accumulator is lower than a set value.

10. The hydraulic control system of claim 9, wherein the sensing device is a pressure sensing device.

11. The pressure control system according to claim 1, further comprising relief valves in communication with the pump body and the oil tank, respectively.

12. The hydraulic control system of any one of claims 1-11, wherein the directional valve has a manual switch that when activated controls the directional valve switching state.

13. A garbage truck, comprising:

the car body is provided with a rotatable tail gate;

the oil tank is arranged on the vehicle body and is connected with the pump body;

the hydraulic control system according to any one of claims 1 to 12, wherein the piston rod is connected with the tail gate to drive the tail gate to rotate.