Hydraulic system for lifting and tilting a cab and method for controlling the same

Abstract

The application provides a lifting and tilting hydraulic system of a cab and a control method thereof, which comprises a lifting hydraulic cylinder, a lifting hydraulic cylinder balance valve, a tilting hydraulic cylinder, a tilting hydraulic cylinder balance valve, a tilting hydraulic cylinder throttle valve, a first one-way valve, a one-way throttle valve, a hydraulic control stop valve, a lifting hydraulic cylinder throttle valve, a second one-way valve, an indoor hand control stop valve, an outdoor hand control stop valve, a hydraulic oil tank, a pilot control end, a high-pressure oil source, a tilting hydraulic control reversing valve group and a lifting hydraulic control reversing valve group. The application realizes the separate or combined action of the cab about lifting and tilting by matching a special hydraulic system, and improves the control flexibility of the equipment. After the equipment appears an abnormality, the application ensures that the cab can be reset orderly and stably, and has high safety.

Description

Technical Field

[0001] This invention patent relates to the field of engineering machinery design technology, and in particular to a hydraulic system for lifting and tilting a cab and its control method. Background Technology

[0002] When a demolition machine is performing demolition operations, the operator not only needs to observe the working situation at the construction arm of the equipment in real time from the cab, but also needs to operate from an upward angle for a long time. This requires the cab to have lifting and tilting functions to improve operating comfort, reduce the fatigue intensity of demolition operations, and at the same time help the equipment operator to complete the demolition of the building more accurately and efficiently.

[0003] Existing special equipment will be equipped with either a lifting cab or a tilting cab (only one of these functions) depending on the operational requirements.

[0004] A single lifting or tilting solution for the cab cannot achieve the combined functions of both. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydraulic system for lifting and tilting a cab and its control method, which can realize the lifting and tilting functions of the cab and ensure that the cab can be reset smoothly and orderly after the equipment malfunctions.

[0006] To address the problems of existing technologies, this invention discloses a hydraulic system for lifting and tilting a cab, comprising: a lifting hydraulic cylinder, a tilting hydraulic cylinder, a hydraulic oil tank, a pilot control terminal, a high-pressure oil source, a control valve group, and a shut-off valve group;

[0007] The pilot control terminal is used to input a pressure signal to the control valve group, and control the pressure oil from the high-pressure oil source to enter the tilting hydraulic cylinder through the control valve group, driving the tilting hydraulic cylinder to extend or retract, thereby causing the cab to tilt.

[0008] The pilot control terminal is also used to input pressure signals to the control valve group, control the pressure oil from the high-pressure oil source to enter the lifting hydraulic cylinder through the control valve group, drive the lifting hydraulic cylinder to extend or retract, and drive the cab to lift.

[0009] The shut-off valve assembly is used to replenish oil from the hydraulic oil tank in the negative pressure chambers of the lifting hydraulic cylinder and the tilting hydraulic cylinder through the control valve assembly when the pilot control terminal and the high pressure oil source fail, and the pressure oil in the positive pressure chambers of the lifting hydraulic cylinder and the tilting hydraulic cylinder flows into the hydraulic oil tank through the shut-off valve assembly, causing the cab to fall back or descend.

[0010] Furthermore,

[0011] It also includes the balance valve for lifting hydraulic cylinders and the balance valve for tilting hydraulic cylinders;

[0012] The lifting hydraulic cylinder balance valve is connected to the control valve group and the lifting hydraulic cylinder. The lifting hydraulic cylinder balance valve is used to prevent the lifting hydraulic cylinder from failing during pressure holding.

[0013] The tilting hydraulic cylinder balance valve connects the control valve group and the tilting hydraulic cylinder, and the tilting hydraulic cylinder balance valve is used to prevent the tilting hydraulic cylinder from failing during pressure holding.

[0014] Furthermore,

[0015] The control valve group includes a tilt hydraulic control directional valve group and a lift hydraulic control directional valve group;

[0016] The tilt hydraulic control directional valve assembly connects the tilt hydraulic cylinder, hydraulic oil tank, and high-pressure oil source;

[0017] The lifting hydraulic control directional valve assembly connects the lifting hydraulic cylinder, the hydraulic oil tank, and the high-pressure oil source.

[0018] Furthermore,

[0019] The control valve group includes a hydraulically controlled directional valve group, an electrically controlled shut-off valve group, and a control switch;

[0020] The control switch is equipped with a gear for controlling the lifting hydraulic cylinder, a gear for controlling the tilting hydraulic cylinder, and a gear for jointly controlling the lifting hydraulic cylinder and the tilting hydraulic cylinder.

[0021] When the gear used to control the lifting hydraulic cylinder is turned on, the pilot control end inputs a pressure signal to the hydraulic control directional valve group, and the pressure oil from the high-pressure oil source enters the lifting hydraulic cylinder through the hydraulic control directional valve group and the electric control shut-off valve group, driving the lifting hydraulic cylinder to extend or retract, thereby driving the cab to lift.

[0022] When the gear used to control the tilting hydraulic cylinder is engaged, the pilot control end inputs a pressure signal to the hydraulic control directional valve group, and the pressure oil from the high-pressure oil source enters the tilting hydraulic cylinder through the hydraulic control directional valve group and the electric control shut-off valve group, driving the tilting hydraulic cylinder to extend or retract, thereby causing the cab to tilt.

[0023] When the gear used to jointly control the lifting hydraulic cylinder and the tilting hydraulic cylinder is engaged, the pilot control end inputs a pressure signal to the hydraulic control directional valve group, and controls the pressure oil from the high-pressure oil source to enter the lifting hydraulic cylinder and the tilting hydraulic cylinder through the hydraulic control directional valve group and the electric control shut-off valve group, driving the lifting hydraulic cylinder and the tilting hydraulic cylinder to extend or retract, thereby driving the cab to lift and tilt.

[0024] The hydraulically controlled directional valve assembly is connected to the hydraulic oil tank.

[0025] Furthermore,

[0026] The electrically controlled shut-off valve group includes a first electrically controlled shut-off valve group and a second electrically controlled shut-off valve group.

[0027] The first electrically controlled shut-off valve group includes a first electrically controlled shut-off valve and a second electrically controlled shut-off valve. The first electrically controlled shut-off valve is connected to the tilting hydraulic cylinder, and the second electrically controlled shut-off valve is connected to the lifting hydraulic cylinder.

[0028] The second electrically controlled shut-off valve group includes a third electrically controlled shut-off valve and a fourth electrically controlled shut-off valve. The third electrically controlled shut-off valve is connected to the tilting hydraulic cylinder balance valve, and the fourth electrically controlled shut-off valve is connected to the lifting hydraulic cylinder balance valve.

[0029] Furthermore,

[0030] The control switch is an automatic reset switch with three positions: B19a, B19b, and B19c. Position B19b is the normally open position. Position B19a is connected to the second and fourth electrically controlled shut-off valves. Position B19c is connected to the first and third electrically controlled shut-off valves. When positions B19a and B19c are not pressed, the switch will automatically return to position B19a.

[0031] Furthermore,

[0032] The shut-off valve assembly includes: a tilting hydraulic cylinder throttle valve, a first check valve, a hydraulically controlled shut-off valve, a second check valve, and a manually controlled shut-off valve;

[0033] The manual shut-off valve is connected to the hydraulic shut-off valve via a second check valve, and the hydraulic shut-off valve is connected to the lifting hydraulic cylinder; the manual shut-off valve is connected to the tilting hydraulic cylinder via a first check valve; the manual shut-off valve is connected to the hydraulic oil tank.

[0034] One end of the tilting hydraulic cylinder throttle valve is connected to the first check valve, and the other end is connected to the tilting hydraulic cylinder and the hydraulic shut-off valve. The tilting hydraulic cylinder throttle valve is used to establish the control pressure of the hydraulic shut-off valve A8 and to adjust the retraction speed of the tilting hydraulic cylinder.

[0035] Furthermore,

[0036] The manual shut-off valve includes an indoor manual shut-off valve and an outdoor manual shut-off valve. The indoor manual shut-off valve is connected to the outdoor manual shut-off valve. The indoor and outdoor manual shut-off valves are connected to a second check valve and a first check valve (A6). The indoor and outdoor manual shut-off valves are connected to a hydraulic oil tank.

[0037] Furthermore,

[0038] It also includes the throttle valve for lifting hydraulic cylinders;

[0039] The lifting hydraulic cylinder throttle valve is connected to a second check valve at one end and a hydraulic shut-off valve at the other end. The lifting hydraulic cylinder throttle valve is used to adjust the extension speed of the lifting hydraulic cylinder.

[0040] Furthermore,

[0041] It also includes a one-way throttle valve, which is connected to the hydraulic shut-off valve and is used to adjust the reset speed of the hydraulic shut-off valve.

[0042] Accordingly, a control method for the hydraulic system of the cab's lifting and tilting:

[0043] When the shut-off valve group is closed, the pilot control terminal inputs a pressure signal to the control valve group, and the pressure oil from the high-pressure oil source enters the tilting hydraulic cylinder through the control valve group, driving the tilting hydraulic cylinder to extend or retract, thereby causing the cab to tilt.

[0044] The pilot control end inputs a pressure signal to the control valve group, and controls the pressure oil from the high-pressure oil source to enter the lifting hydraulic cylinder through the control valve group, driving the lifting hydraulic cylinder to extend or retract, thereby causing the cab to lift.

[0045] When the pilot control terminal and high-pressure oil source fail, the negative pressure chamber of the lifting hydraulic cylinder or tilting hydraulic cylinder is replenished with oil from the hydraulic oil tank through the control valve group, and the pressure oil in the positive pressure chamber of the lifting hydraulic cylinder or tilting hydraulic cylinder flows into the hydraulic oil tank through the shut-off valve group, causing the cab to fall back and descend.

[0046] Furthermore,

[0047] When the shut-off valve group is closed, the pilot control end inputs a pressure signal to the tilt hydraulic control directional valve group. The pressure signal controls the pressure oil from the high-pressure oil source to enter the tilt hydraulic cylinder through the tilt hydraulic control directional valve group, driving the tilt hydraulic cylinder to extend or retract, thereby causing the cab to tilt.

[0048] The pilot control end inputs a pressure signal to the lifting hydraulic control directional valve group. The pressure signal controls the pressure oil from the high-pressure oil source to enter the lifting hydraulic cylinder through the lifting hydraulic control directional valve group, driving the lifting hydraulic cylinder to extend or retract, thereby causing the cab to lift.

[0049] When the pilot control terminal and high-pressure oil source fail, and the cab is in a raised and tilted state, the shut-off valve group opens; at this time, the tilting hydraulic cylinder retracts under the weight of the cab, the negative pressure chamber of the tilting hydraulic cylinder is replenished with oil from the hydraulic oil tank through the tilting hydraulic control reversing valve group, and the pressure oil in the positive pressure chamber of the tilting hydraulic cylinder flows into the hydraulic oil tank through the shut-off valve group, and the tilting hydraulic cylinder retracts, that is, the cab falls back.

[0050] The lifting hydraulic cylinder extends under the weight of the cab. The negative pressure chamber of the lifting hydraulic cylinder is replenished with oil from the hydraulic oil tank through the lifting hydraulic control directional valve group, and the pressure oil in the positive pressure chamber of the lifting hydraulic cylinder flows into the hydraulic oil tank through the shut-off valve group. The extension of the lifting hydraulic cylinder means that the cab descends.

[0051] Furthermore,

[0052] When the shut-off valve group is in the closed state, it is used to control the opening of the lifting hydraulic cylinder. The pilot control end inputs a pressure signal to the hydraulic control directional valve group, and controls the pressure oil of the high-pressure oil source to enter the lifting hydraulic cylinder through the hydraulic control directional valve group and the electric shut-off valve group, driving the lifting hydraulic cylinder to extend or retract, thereby driving the cab to lift.

[0053] The pilot control end inputs a pressure signal to the hydraulic control directional valve group to control the opening of the tilting hydraulic cylinder. The pressure oil from the high-pressure oil source enters the tilting hydraulic cylinder through the hydraulic control directional valve group and the electric shut-off valve group, driving the tilting hydraulic cylinder to retract or extend, thereby causing the cab to tilt.

[0054] The system is used to jointly control the gear opening of the lifting hydraulic cylinder and the tilting hydraulic cylinder. The pilot control end inputs a pressure signal to the hydraulic control directional valve group, and controls the pressure oil from the high-pressure oil source to enter the lifting hydraulic cylinder and the tilting hydraulic cylinder through the hydraulic control directional valve group and the electric control shut-off valve group, driving the lifting hydraulic cylinder and the tilting hydraulic cylinder to extend or retract, thereby driving the cab to lift and tilt.

[0055] When the pilot control terminal and high-pressure oil source fail and the cab is in a raised and tilted state, the shut-off valve group opens; at this time, the tilting hydraulic cylinder retracts under the weight of the cab, and the negative pressure chamber of the tilting hydraulic cylinder is replenished with oil from the hydraulic oil tank through the hydraulic control directional valve group and the electric control shut-off valve group, and the pressure oil in the positive pressure chamber of the tilting hydraulic cylinder flows into the hydraulic oil tank through the shut-off valve group. The tilting hydraulic cylinder retracts, that is, the cab falls back;

[0056] The lifting hydraulic cylinder extends under the weight of the cab. The negative pressure chamber of the lifting hydraulic cylinder is replenished with oil from the hydraulic oil tank through the hydraulic control directional valve group and the electric control shut-off valve group. The pressure oil in the positive pressure chamber of the lifting hydraulic cylinder flows into the hydraulic oil tank through the shut-off valve group. The extension of the lifting hydraulic cylinder causes the cab to descend.

[0057] Furthermore,

[0058] When the shut-off valve assembly is closed and the B19a position is pressed, a pressure signal is input to the hydraulic directional valve assembly via the pilot control terminal. This controls the pressure oil from the high-pressure oil source to enter the tilting hydraulic cylinder through the hydraulic directional valve assembly, the first electrically controlled shut-off valve, or the third electrically controlled shut-off valve, driving the tilting hydraulic cylinder to retract or extend, thus tilting the cab. When the B19c position is pressed, a pressure signal is input to the hydraulic directional valve assembly via the pilot control terminal. This controls the pressure oil from the high-pressure oil source to enter the tilting hydraulic cylinder through the hydraulic directional valve assembly, the second electrically controlled shut-off valve, or the third electrically controlled shut-off valve, thus driving the tilting hydraulic cylinder to retract or extend, thereby tilting the cab. The hydraulic cylinder is controlled by a shut-off valve or a fourth electrically controlled shut-off valve, which drives the hydraulic cylinder to extend or retract, thereby raising or lowering the cab. When the automatic reset switch is not pressed, a pressure signal is input to the hydraulic directional valve group through the pilot control terminal. The pressure oil from the high-pressure oil source passes through the hydraulic directional valve group, the first electrically controlled shut-off valve group, or the second electrically controlled shut-off valve group into the hydraulic cylinder and the tilting hydraulic cylinder, driving them to extend or retract, thereby raising or lowering and tilting the cab.

[0059] Furthermore,

[0060] When the pilot control terminal and high-pressure oil source fail, and the cab is in a raised and tilted position, the manual shut-off valve inside the control room or outside the control room opens. At this time, the tilting hydraulic cylinder retracts under the weight of the cab. The negative pressure chamber of the tilting hydraulic cylinder is replenished with oil from the hydraulic oil tank through the control valve group, and the pressure oil in the positive pressure chamber of the tilting hydraulic cylinder flows into the hydraulic oil tank through the first check valve and the manual shut-off valve. At this time, the hydraulic shut-off valve is in the shut-off state, which prevents the pressure oil in the negative pressure chamber of the lifting hydraulic cylinder from flowing into the hydraulic oil tank. After the tilting hydraulic cylinder is fully retracted, i.e., the cab is completely lowered, the hydraulic shut-off valve is in the open state, and the lifting hydraulic cylinder extends under the weight of the cab. The negative pressure chamber of the lifting hydraulic cylinder is replenished with oil from the hydraulic oil tank through the control valve group, and the pressure oil in the positive pressure chamber of the lifting hydraulic cylinder flows into the hydraulic oil tank through the hydraulic shut-off valve, the second check valve, and the manual shut-off valve until the lifting hydraulic cylinder is fully extended, i.e., the cab is completely lowered.

[0061] The beneficial effects of this invention are as follows:

[0062] 1. This invention enables individual or combined movements of the cab regarding lifting and tilting, improving the operational flexibility of the equipment.

[0063] 2. In the event of an equipment malfunction, this invention ensures that the cab can be reset smoothly and orderly, thus providing a high level of safety. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the hydraulic principle of the present invention;

[0065] Figure 2This is a schematic diagram of the hydraulic principle of another embodiment of the present invention;

[0066] Figure 3 yes Figure 2 Schematic diagram of the first electrically controlled shut-off valve assembly;

[0067] Figure 4 yes Figure 2 A schematic diagram of the composition of the second electrically controlled shut-off valve assembly. Detailed Implementation

[0068] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0069] like Figure 1 As shown, this invention discloses a lifting and tilting hydraulic system for a cab, comprising a lifting hydraulic cylinder A1, a lifting hydraulic cylinder balance valve A2, a tilting hydraulic cylinder A3, a tilting hydraulic cylinder balance valve A4, a tilting hydraulic cylinder throttle valve A5, a first check valve A6, a one-way throttle valve A7, a hydraulically controlled shut-off valve A8, a lifting hydraulic cylinder throttle valve A9, a second check valve A10, an indoor manual shut-off valve A11, an outdoor manual shut-off valve A12, a hydraulic oil tank A13, a pilot control terminal A14, a high-pressure oil source A15, a tilting hydraulically controlled directional valve group A16, and a lifting hydraulically controlled directional valve group A17.

[0070] High-pressure oil source A15 is connected to tilt hydraulic cylinder A3 and tilt hydraulic cylinder balance valve A4 through tilt hydraulic control directional valve group A16; high-pressure oil source A15 is connected to lifting hydraulic cylinder A1 and lifting hydraulic cylinder balance valve A2 through lifting hydraulic control directional valve group A17; tilt hydraulic control directional valve group A16 and lifting hydraulic control directional valve group A17 are respectively connected to hydraulic oil tank A13 and pilot control terminal A14;

[0071] Indoor manual shut-off valve A11 is connected to outdoor manual shut-off valve A12. Indoor manual shut-off valve A11 and outdoor manual shut-off valve A12 are connected to lifting hydraulic cylinder throttle valve A9 through second check valve A10. Lifting hydraulic cylinder throttle valve A9 is connected to lifting hydraulic cylinder A1 and lifting hydraulic cylinder balance valve A2 through hydraulic control shut-off valve A8. Indoor manual shut-off valve A11 and outdoor manual shut-off valve A12 are connected to tilting hydraulic cylinder throttle valve A5 through first check valve A6. Tilting hydraulic cylinder throttle valve A5 is connected to tilting hydraulic cylinder A3 and tilting hydraulic cylinder balance valve A4. Tilting hydraulic cylinder throttle valve A5 is connected to hydraulic control shut-off valve A8 through check throttle valve A7. Indoor manual shut-off valve A11 and outdoor manual shut-off valve A12 are connected to hydraulic oil tank A13.

[0072] The lifting hydraulic cylinder A1 is used to perform the lifting function of the cab. Its working oil ports are A1-1 and A1-2. When the cab is raised, oil enters through A1-2 and returns through A1-1. When the cab is lowered, oil enters through A1-1 and returns through A1-2.

[0073] The control port of the lifting hydraulic cylinder balance valve A2 is port A2-1, and the working ports are port A2-2 and port A2-3. When no pressure oil is supplied to port A2-1, pressure oil is only allowed to flow from port A2-2 to port A2-3, and reverse flow is blocked. When pressure oil is supplied to port A2-1, pressure oil can flow from port A2-2 to port A2-3, or from port A2-3 to port A2-2.

[0074] The tilting hydraulic cylinder A3 is used to perform the tilting function of the equipment cab. Its working oil ports are A3-1 and A3-2. When the cab tilts upward, oil enters through port A3-2 and returns through port A3-1. When the cab tilts downward, oil enters through port A3-1 and returns through port A3-2.

[0075] The control port of the tilting hydraulic cylinder balance valve A4 is port A4-1, and the working ports are port A4-2 and port A4-3. When no pressure oil is supplied to port A4-1, pressure oil is only allowed to flow from port A4-2 to port A4-3, and reverse flow is blocked. When pressure oil is supplied to port A4-1, pressure oil can flow from port A4-2 to port A4-3, or from port A4-3 to port A4-2.

[0076] The working ports of the tilting hydraulic cylinder throttle valve A5 are A5-1 and A5-2. When there is oil flow in the valve, it plays a role in throttling and pressure reduction; otherwise, it will not.

[0077] The working ports of the first check valve A6 are A6-1 and A6-2; only pressure oil is allowed to flow from A6-1 to A6-2, and reverse flow is blocked.

[0078] The working ports of the one-way throttle valve A7 are A7-1 and A7-2. When the pressurized oil flows from port A7-1 to port A7-2, it plays a role in throttling and reducing pressure; the reverse flow is the normal passage.

[0079] The control port of the hydraulic shut-off valve A8 is port A8-1, and the working ports are port A8-2 and port A8-3. When no pressure oil is supplied to port A8-1, there is a passage between port A8-2 and port A8-3. When pressure oil is supplied to port A8-1, the passage between port A8-2 and port A8-3 is cut off.

[0080] The working ports of the lifting hydraulic cylinder throttle valve A9 are A9-1 and A9-2. When there is oil flow in the valve, it plays a role in throttling and reducing pressure; otherwise, it will not.

[0081] The working ports of the second check valve A10 are A10-1 and A10-2; only pressure oil is allowed to flow from A10-1 to A10-2, and reverse flow is blocked.

[0082] The indoor manual shut-off valve A11 is controlled to open or close by a handle and is located in the equipment driver's cab. Its working oil ports are A11-1 and A11-2. When closed, the connection between A11-1 and A11-2 is cut off. When open, the connection between A11-1 and A11-2 is open.

[0083] The outdoor manual shut-off valve A12 is opened or closed by a handle and is located outside the equipment operator's room and on the main body of the equipment. Its working oil ports are A12-1 and A12-2. When closed, the connection between A12-1 and A12-2 is cut off. When open, the connection between A12-1 and A12-2 is open.

[0084] The pilot control terminal A14 includes the component assembly and corresponding control principle used for hydraulic pilot control in the overall equipment system.

[0085] The high-pressure oil source A15 provides pressurized oil to the working oil circuit of the hydraulic system.

[0086] The tilting hydraulic directional valve group A16 is equipped with a hydraulic directional valve, a check valve, and a relief valve. Its control ports are A16-1 and A16-2, and its working ports are A16-3, A16-4, A16-5, and A16-6. When no pressure oil is supplied to ports A16-1 and A16-2, pressure oil is allowed to flow from port A16-4 to ports A16-5 and A16-6. When pressure oil is supplied to only port A16-1, ports A16-3 and A16-5 are connected, and ports A16-4 and A16-6 are connected. When pressure oil is supplied to only port A16-2, ports A16-3 and A16-6 are connected, and ports A16-4 and A16-5 are connected.

[0087] The lifting hydraulic directional valve group A17 is equipped with a hydraulic directional valve, a check valve, and a relief valve. Its control ports are A17-1 and A17-2, and its working ports are A17-3, A17-4, A17-5, and A17-6. When no pressure oil is supplied to ports A17-1 and A17-2, pressure oil is allowed to flow from port A17-4 to ports A17-5 and A17-6. When pressure oil is supplied to only port A17-1, ports A17-3 and A17-5 are connected, and ports A17-4 and A17-6 are connected. When pressure oil is supplied to only port A17-2, ports A17-3 and A17-6 are connected, and ports A17-4 and A17-5 are connected.

[0088] The specific locations and connections of the components in the aforementioned hydraulic system are as follows:

[0089] Oil ports A1-1, A2-1, and A17-5 are connected sequentially; oil ports A1-2, A2-3, and A8-2 are connected sequentially; oil ports A2-2 and A17-6 are connected; oil ports A3-1, A4-1, and A16-5 are connected sequentially; oil ports A3-2, A4-3, A5-1, and A7-2 are connected sequentially; oil ports A4-2 and A16-6 are connected; oil ports A5-2 and A6-1 are connected; oil ports A6-2, A10-2, A11-1, and A12-1 are connected sequentially; oil port A7-1... Connect A8-1 oil port; connect A8-3 and A9-1 oil ports; connect A9-2 and A10-1 oil ports; connect A11-2, A12-2, and hydraulic oil tank A13 in sequence; connect A16-1 oil port and pilot control terminal A14; connect A16-2 oil port and pilot control terminal A14; connect A16-3 oil port, A17-3 oil port, and high-pressure oil source A15 in sequence; connect A16-4 oil port, A17-4 oil port, and hydraulic oil tank A13 in sequence; connect A17-1 oil port and pilot control terminal A14; connect A17-2 oil port and pilot control terminal A14.

[0090] The specific application principle of the hydraulic system in this invention is as follows:

[0091] When the equipment is working normally, the indoor manual shut-off valve A11 and the outdoor manual shut-off valve A12 are in the closed state. The equipment operator inputs pressure signals to the oil ports A16-1, A16-2, A17-1, or A17-2 respectively through the pilot control terminal A14. This controls the pressure oil from the high-pressure oil source A15 to enter the tilt hydraulic cylinder A3 and the lifting hydraulic cylinder A1 respectively through the tilt hydraulic control directional valve group A16 and the lifting hydraulic cylinder A17, driving them to extend or retract, thereby enabling the cab to perform lifting and tilting functions. This allows the cab to perform individual or combined lifting and tilting actions. The lifting hydraulic cylinder balance valve A2 is used to prevent the lifting hydraulic cylinder A1 from failing during pressure holding. The tilt hydraulic cylinder balance valve A4 is used to prevent the tilt hydraulic cylinder A3 from failing during pressure holding.

[0092] When the equipment malfunctions (pilot control terminal A14 or high-pressure oil source A15 fails) and the cab is in a raised and tilted position, the operator inside the cab needs to open the manual shut-off valve A11 (or the operator outside the cab needs to open the manual shut-off valve A12). At this time, the tilting hydraulic cylinder A3 retracts under the weight of the cab. Its negative pressure chamber is replenished with oil from the hydraulic oil tank A13 through the tilting hydraulic control directional valve group A16, and the pressure oil in the positive pressure chamber flows into the hydraulic oil tank A13 through the tilting hydraulic cylinder throttle valve A5, the first check valve A6, and the indoor manual shut-off valve A11 (or the outdoor manual shut-off valve A12). At this time, the pressure built up at port A5-1 due to the pressure oil flowing through the tilting hydraulic cylinder throttle valve A5 causes the hydraulic control shut-off valve A8 to be in the closed state, thus preventing the pressure oil in the negative pressure chamber of the lifting hydraulic cylinder A1 from flowing into the hydraulic oil tank A13. After the tilting hydraulic cylinder A3 is fully retracted... After the cab fully retracts, there is no oil flow in the tilt hydraulic cylinder throttle valve A5, no pressure at port A8-1, and the hydraulic shut-off valve A8 is in the connected state. The lifting hydraulic cylinder A1 extends under the weight of the cab. Its positive pressure chamber is replenished with oil from the hydraulic oil tank A13 through the lifting hydraulic control directional valve group A17. The pressure oil in the negative pressure chamber flows into the hydraulic oil tank A13 through the hydraulic shut-off valve A8, the lifting hydraulic cylinder throttle valve A9, the second one-way valve A10, and the indoor manual shut-off valve A11 (or the outdoor manual shut-off valve A12) until the lifting hydraulic cylinder A1 is fully extended, i.e., the cab is fully lowered. During this process, the tilt hydraulic cylinder throttle valve A5 is used to adjust the retraction speed of the tilt hydraulic cylinder A3, the lifting hydraulic cylinder throttle valve A9 is used to adjust the extension speed of the lifting hydraulic cylinder A1, and the one-way throttle valve A7 is used to adjust the reset speed of the hydraulic shut-off valve A8. This allows the cab to reset smoothly and orderly.

[0093] like Figure 2As shown, the present invention also provides another solution, including a lifting hydraulic cylinder A1, a lifting hydraulic cylinder balance valve A2, a tilting hydraulic cylinder A3, a tilting hydraulic cylinder balance valve A4, a tilting hydraulic cylinder throttle valve A5, a first check valve A6, a one-way throttle valve A7, a hydraulically controlled shut-off valve A8, a lifting hydraulic cylinder throttle valve A9, a second check valve A10, an indoor manual shut-off valve A11, an outdoor manual shut-off valve A12, a hydraulic oil tank A13, a pilot control terminal A14, a high-pressure oil source A15, a hydraulically controlled directional valve group B16, a first electrically controlled shut-off valve group B17, a second electrically controlled shut-off valve group B18, and an automatic reset switch B19;

[0094] High-pressure oil source A15 is connected to first electrically controlled shut-off valve group B17 and second electrically controlled shut-off valve group B18 via hydraulically controlled directional valve group B16. First electrically controlled shut-off valve group B17 and second electrically controlled shut-off valve group B18 are respectively connected to automatic reset switch B19. Lifting hydraulic cylinder A1 is connected to lifting hydraulic cylinder balance valve A2. Tilting hydraulic cylinder A3 is connected to tilting hydraulic cylinder balance valve A4. One end of first electrically controlled shut-off valve group B17 is connected to lifting hydraulic cylinder A1, and the other end is connected to tilting hydraulic cylinder A3. One end of second electrically controlled shut-off valve group B18 is connected to lifting hydraulic cylinder balance valve A2, and the other end is connected to tilting hydraulic cylinder balance valve A4. Hydraulically controlled directional valve group B16 is connected to hydraulic oil tank A13 and pilot control terminal A14.

[0095] The indoor manual shut-off valve A11 is connected to the outdoor manual shut-off valve A12. The indoor manual shut-off valve A11 and the outdoor manual shut-off valve A12 are connected to the lifting hydraulic cylinder throttle valve A9 through the second check valve A10. The lifting hydraulic cylinder throttle valve A9 is connected to the lifting hydraulic cylinder A1 and the lifting hydraulic cylinder balance valve A2 through the hydraulic shut-off valve A8. The indoor manual shut-off valve A11 and the outdoor manual shut-off valve A12 are connected to the tilting hydraulic cylinder throttle valve A5 through the first check valve A6. The tilting hydraulic cylinder throttle valve A5 is connected to the tilting hydraulic cylinder A3 and the tilting hydraulic cylinder balance valve A4.

[0096] The lifting hydraulic cylinder A1 is used to perform the lifting function of the cab. Its working oil ports are A1-1 and A1-2. When the cab is raised, oil enters through A1-2 and returns through A1-1. When the cab is lowered, oil enters through A1-1 and returns through A1-2.

[0097] The control port of the lifting hydraulic cylinder balance valve A2 is port A2-1, and the working ports are port A2-2 and port A2-3. When no pressure oil is supplied to port A2-1, pressure oil is only allowed to flow from port A2-2 to port A2-3, and reverse flow is blocked. When pressure oil is supplied to port A2-1, pressure oil can flow from port A2-2 to port A2-3, or from port A2-3 to port A2-2.

[0098] The tilting hydraulic cylinder A3 corresponds to the tilting cylinder of the equipment cab, and its working oil ports are A3-1 and A3-2. When the cab tilts upward, oil enters through port A3-2 and returns through port A3-1. When the cab tilts downward, oil enters through port A3-1 and returns through port A3-2.

[0099] The control port of the tilting hydraulic cylinder balance valve A4 is port A4-1, and the working ports are port A4-2 and port A4-3. When no pressure oil is supplied to port A4-1, pressure oil is only allowed to flow from port A4-2 to port A4-3, and reverse flow is blocked. When pressure oil is supplied to port A4-1, pressure oil can flow from port A4-2 to port A4-3, or from port A4-3 to port A4-2.

[0100] The working ports of the tilting hydraulic cylinder throttle valve A5 are A5-1 and A5-2. When there is oil flow in the valve, it plays a role in throttling and pressure reduction; otherwise, it will not.

[0101] The working ports of the first check valve A6 are A6-1 and A6-2; only pressure oil is allowed to flow from A6-1 to A6-2, and reverse flow is blocked.

[0102] The working ports of the one-way throttle valve A7 are A7-1 and A7-2. When the pressurized oil flows from port A7-1 to port A7-2, it plays a role in throttling and reducing pressure; the reverse flow is the normal passage.

[0103] The control port of the hydraulic shut-off valve A8 is port A8-1, and the working ports are port A8-2 and port A8-3. When no pressure oil is supplied to port A8-1, there is a passage between port A8-2 and port A8-3. When pressure oil is supplied to port A8-1, the passage between port A8-2 and port A8-3 is cut off.

[0104] The working ports of the lifting hydraulic cylinder throttle valve A9 are A9-1 and A9-2. When there is oil flow in the valve, it plays a role in throttling and reducing pressure; otherwise, it will not.

[0105] The working ports of the second check valve A10 are A10-1 and A10-2; only pressure oil is allowed to flow from A10-1 to A10-2, and reverse flow is blocked.

[0106] The first indoor manual shut-off valve A11 is controlled to open or close by a handle and is located in the equipment driver's cab. Its working oil ports are A11-1 and A11-2. When closed, the connection between A11-1 and A11-2 is cut off. When open, the connection between A11-1 and A11-2 is open.

[0107] The outdoor manual shut-off valve A12 is opened or closed by a handle and is located outside the equipment operator's room and on the main body of the equipment. Its working oil ports are A12-1 and A12-2. When closed, the connection between A12-1 and A12-2 is cut off. When open, the connection between A12-1 and A12-2 is open.

[0108] The pilot control terminal A14 includes the component assembly and corresponding control principle used for hydraulic pilot control in the overall equipment system.

[0109] The high-pressure oil source A15 provides pressurized oil to the working oil circuit of the hydraulic system.

[0110] The hydraulically controlled directional valve assembly B16 is equipped with a hydraulically controlled directional valve, a check valve, and a relief valve. Its control ports are B16-1 and B16-2, and its working ports are B16-3, B16-4, B16-5, and B16-6. When no pressure oil is supplied to ports B16-1 and B16-2, pressure oil is allowed to flow from port B16-4 to ports B16-5 and B16-6. When pressure oil is supplied to only port B16-1, ports B16-3 and B16-5 are connected, and ports B16-4 and B16-6 are connected. When pressure oil is supplied to only port B16-2, ports B16-3 and B16-6 are connected, and ports B16-4 and B16-5 are connected.

[0111] like Figure 3 As shown, the first electrically controlled shut-off valve group B17 includes a first electrically controlled shut-off valve B17a and a second electrically controlled shut-off valve B17b, with working oil ports B17-1, B17-2, and B17-3. When neither the first electrically controlled shut-off valve B17a nor the second electrically controlled shut-off valve B17b receives an electrical signal, oil ports B17-1, B17-2, and B17-3 are connected. When only the first electrically controlled shut-off valve B17a receives an electrical signal, oil ports B17-1 and B17-3 are connected, and oil port B17-2 is shut off. When only the second electrically controlled shut-off valve B17b receives an electrical signal, oil ports B17-1 and B17-2 are connected, and oil port B17-3 is shut off.

[0112] like Figure 3As shown, the second electrically controlled shut-off valve group B18 includes a third electrically controlled shut-off valve B18a and a fourth electrically controlled shut-off valve B18b, with working oil ports B18-1, B18-2, and B18-3. When the third electrically controlled shut-off valve B18a and the fourth electrically controlled shut-off valve B18b do not receive an electrical signal, oil ports B18-1, B18-2, and B18-3 are connected. When only the third electrically controlled shut-off valve B18a receives an electrical signal, oil ports B18-1 and B18-3 are connected, and oil port B18-2 is shut off. When only the fourth electrically controlled shut-off valve B18b receives an electrical signal, oil ports B18-1 and B18-2 are connected, and oil port B18-3 is shut off.

[0113] The automatic reset switch B19 includes positions B19a, B19b, and B19c. The position is selected by pressing with a finger (outputting an electrical signal). Position B19b is the normally open position, meaning that when there is no finger pressing in positions B19a or B19c, the switch will automatically return to position B19a.

[0114] The specific locations and connections of the components in the aforementioned hydraulic system are as follows:

[0115] Connect oil ports A1-1, A2-1, and B17-3 in sequence; connect oil ports A1-2, A2-3, and A8-2 in sequence; connect oil ports A2-2 and B18-3; connect oil ports A3-1, A4-1, and B17-2 in sequence; connect oil ports A3-2, A4-3, A5-1, and A7-2 in sequence; connect oil ports A4-2 and B18-2; connect oil ports A5-2 and A6-1; connect oil ports A6-2, A10-2, A11-1, and A12-1 in sequence; connect oil ports A7-1 and A8-1; connect oil ports A8-3 and A9-1. Connections: A9-2 oil port, A10-1 oil port connection; A11-2 oil port, A12-2 oil port, and hydraulic oil tank A13 connection in sequence; B16-1 oil port and pilot control terminal A14 connection; B16-2 oil port and pilot control terminal A14 connection; B16-3 oil port and high-pressure oil source A15 connection; B16-4 oil port and hydraulic oil tank A13 connection; B16-5 oil port and B17-1 oil port connection; B16-6 oil port and B18-1 oil port connection; B19a position synchronously controls the second electrically controlled shut-off valve B17b and the fourth electrically controlled shut-off valve B18b; B19c position synchronously controls the first electrically controlled shut-off valve B17a and the third electrically controlled shut-off valve B18a.

[0116] The specific application principle of the hydraulic system in this invention is as follows:

[0117] When the equipment is operating normally, the indoor manual shut-off valve A11 and the outdoor manual shut-off valve A12 are closed. When the B19a position is pressed by a finger, the operator inputs a pressure signal to port B16-1 or B16-2 via the pilot control terminal A14. This controls the pressure oil from the high-pressure oil source A15 to flow through the hydraulic directional valve group B16, the first solenoid shut-off valve B17a, or the third solenoid shut-off valve B18a into the tilting hydraulic cylinder A3, driving it to retract or extend, thus tilting the cab. When the B19c position is pressed by a finger, the operator inputs a pressure signal to port B16-1 or B16-2 via the pilot control terminal A14. This controls the pressure oil from the high-pressure oil source A15 to flow through the hydraulic directional valve group B16, the second solenoid shut-off valve B17b, or the fourth solenoid shut-off valve B18b into the lifting hydraulic cylinder A1, driving it to tilt. The extension or retraction action drives the cab to achieve the lifting and lowering function. When the automatic reset switch B19 is in the no-finger-press state, the equipment operator inputs a pressure signal to port B16-1 or port B16-2 through the pilot control terminal A14. This controls the pressure oil from the high-pressure oil source A15 to enter the lifting hydraulic cylinder A1 and the tilting hydraulic cylinder A3 through the hydraulic control directional valve group B16, the first solenoid valve group B17, or the second solenoid valve group B18, driving them to extend or retract, thereby driving the cab to achieve the lifting and tilting functions. This enables the cab to perform individual or combined lifting and tilting actions. The lifting hydraulic cylinder balance valve A2 is used to prevent the lifting hydraulic cylinder A1 from failing during pressure holding. The tilting hydraulic cylinder balance valve A4 is used to prevent the tilting hydraulic cylinder A3 from failing during pressure holding.

[0118] When the equipment malfunctions (pilot control terminal A14 or high-pressure oil source A15 fails) and the cab is in a raised and tilted position, the operator inside the cab needs to open the manual shut-off valve A11 (or the operator outside the cab needs to open the manual shut-off valve A12). At this time, the tilting hydraulic cylinder A3 retracts under the weight of the cab. Its negative pressure chamber is replenished with oil from the hydraulic oil tank A13 through the hydraulic control directional valve group B16 and the first electric shut-off valve group B17. The pressure oil in the positive pressure chamber flows into the hydraulic oil tank A13 through the tilting hydraulic cylinder throttle valve A5, the first check valve A6, and the indoor manual shut-off valve A11 (or the outdoor manual shut-off valve A12). At this time, the pressure built up at port A5-1 due to the pressure oil flowing through the tilting hydraulic cylinder throttle valve A5 causes the hydraulic control shut-off valve A8 to be in the shut-off state, thus preventing the pressure oil in the negative pressure chamber of the lifting hydraulic cylinder A1 from flowing into the hydraulic oil tank A13. After the tilting hydraulic cylinder A3 is fully retracted... After the cab is fully retracted, there is no oil flow in the tilting hydraulic cylinder throttle valve A5, no pressure at port A8-1, and the hydraulic shut-off valve A8 is in the connected state. The lifting hydraulic cylinder A1 extends under the weight of the cab. Its positive pressure chamber is replenished with oil from the hydraulic oil tank A13 through the hydraulic directional valve group B16 and the first electrically controlled shut-off valve group B17. The pressure oil in the negative pressure chamber is supplied through the hydraulic shut-off valve A8, the lifting hydraulic cylinder throttle valve A9, the second check valve A10, and the indoor manual shut-off valve. Valve A11 (or outdoor manual shut-off valve A12) flows into hydraulic oil tank A13 until lifting hydraulic cylinder A1 is fully extended, i.e., the cab is fully lowered. During this process, tilt hydraulic cylinder throttle valve A5 is used to adjust the retraction speed of tilt hydraulic cylinder A3, lifting hydraulic cylinder throttle valve A9 is used to adjust the extension speed of lifting hydraulic cylinder A1, and one-way throttle valve A7 is used to adjust the reset speed of hydraulic shut-off valve A8. Thus, the cab can be reset in an orderly and smooth manner.

[0119] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the accompanying drawings of this invention, the fill patterns are only for distinguishing layers and do not constitute any other limitation.

[0120] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic system for raising and tilting a cab, characterized in that Comprise: Lifting hydraulic cylinder (A1), tilting hydraulic cylinder (A3), hydraulic oil tank (A13), pilot control end (A14), high pressure oil source (A15), control valve group and stop valve group; The pilot control end (A14) is used for inputting a pressure signal to the control valve group, controlling the pressure oil of the high pressure oil source (A15) to enter the tilting hydraulic cylinder (A3) through the control valve group, driving the tilting hydraulic cylinder (A3) to extend or retract to drive the cab to tilt; The pilot control end (A14) is also used for inputting a pressure signal to the control valve group, controlling the pressure oil of the high pressure oil source (A15) to enter the lifting hydraulic cylinder (A1) through the control valve group, driving the lifting hydraulic cylinder (A1) to extend or retract to drive the cab to lift; The stop valve group is used for when the pilot control end (A14) and the high pressure oil source (A15) fail, the negative pressure cavity of the lifting hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3) is supplied with oil from the hydraulic oil tank (A13) through the control valve group, and the pressure oil in the positive pressure cavity of the lifting hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3) flows into the hydraulic oil tank (A13) through the stop valve group, and the cab falls or descends.

2. The hydraulic system for raising and tilting a cab according to claim 1, wherein It also includes lifting hydraulic cylinder balance valve (A2) and tilting hydraulic cylinder balance valve (A4); The lifting hydraulic cylinder balance valve (A2) is connected with the control valve group and the lifting hydraulic cylinder (A1), and the lifting hydraulic cylinder balance valve (A2) is used to prevent the lifting hydraulic cylinder (A1) from failing when pressure maintaining; The tilting hydraulic cylinder balance valve (A4) is connected with the control valve group and the tilting hydraulic cylinder (A3), and the tilting hydraulic cylinder balance valve (A4) is used to prevent the tilting hydraulic cylinder (A3) from failing when pressure maintaining.

3. The hydraulic system for raising and tilting a cab according to claim 1, wherein The control valve group comprises tilting hydraulic control reversing valve group (A16) and lifting hydraulic control reversing valve group (A17); The tilting hydraulic control reversing valve group (A16) is connected with the tilting hydraulic cylinder (A3), the hydraulic oil tank (A13) and the high pressure oil source (A15); The lifting hydraulic control reversing valve group (A17) is connected with the lifting hydraulic cylinder (A1), the hydraulic oil tank (A13) and the high pressure oil source (A15).

4. The hydraulic system for raising and tilting a cab according to claim 1, wherein The control valve group comprises hydraulic control reversing valve group (B16), electric control stop valve group and control switch; The control switch is provided with a gear for controlling the lifting hydraulic cylinder (A1), a gear for controlling the tilting hydraulic cylinder (A3), and a gear for jointly controlling the lifting hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3); When the gear for controlling the lifting hydraulic cylinder (A1) is turned on, the pilot control end (A14) inputs a pressure signal to the hydraulic control reversing valve group (B16), controls the pressure oil of the high pressure oil source (A15) to enter the lifting hydraulic cylinder (A1) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, drives the lifting hydraulic cylinder (A1) to extend or retract, and drives the cab to lift; When the gear for controlling the tilt hydraulic cylinder (A3) is opened, the pilot control end (A14) inputs a pressure signal to the hydraulic control reversing valve group (B16), controls the pressure oil of the high-pressure oil source (A15) to enter the tilt hydraulic cylinder (A3) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, drives the tilt hydraulic cylinder (A3) to extend or retract, and drives the cab to tilt; When the gear for jointly controlling the lifting hydraulic cylinder (A1) and the tilt hydraulic cylinder (A3) is opened, the pilot control end (A14) inputs a pressure signal to the hydraulic control reversing valve group (B16), controls the pressure oil of the high-pressure oil source (A15) to enter the lifting hydraulic cylinder (A1) and the tilt hydraulic cylinder (A3) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, drives the lifting hydraulic cylinder (A1) and the tilt hydraulic cylinder (A3) to extend or retract, and drives the cab to lift and tilt; The hydraulic control reversing valve group (B16) is connected to the hydraulic oil tank (A13).

5. The lifting and tilting hydraulic system of the cab according to claim 4, characterized in that: the electric control stop valve group comprises a first electric control stop valve group (B17) and a second electric control stop valve group (B18); the first electric control stop valve group (B17) comprises a first electric control stop valve (B17a) connected to the tilt hydraulic cylinder (A3) and a second electric control stop valve (B17b) connected to the lifting hydraulic cylinder (A1); the second electric control stop valve group (B18) comprises a third electric control stop valve (B18a) connected to the tilt hydraulic cylinder balance valve (A4) and a fourth electric control stop valve (B18b) connected to the lifting hydraulic cylinder balance valve (A2).

6. The lifting and tilting hydraulic system of the cab according to claim 5, characterized in that: the control switch is an automatic reset switch (B19), and the automatic reset switch (B19) is provided with three gears including a B19a gear, a B19b gear and a B19c gear, wherein the B19b gear is a constant-on gear, the B19a gear is connected to the second electric control stop valve (B17b) and the fourth electric control stop valve (B18b), the B19c gear is connected to the first electric control stop valve (B17a) and the third electric control stop valve (B18a), and when the B19a gear and the B19c gear are not pressed, the switch will automatically restore to the B19a gear.

7. The lifting and tilting hydraulic system of the cab according to claim 1, characterized in that: the stop valve group comprises a tilt hydraulic cylinder throttle valve (A5), a first check valve (A6), a hydraulic control stop valve (A8), a second check valve (A10) and a hand control stop valve; the hand control stop valve is connected to the hydraulic control stop valve (A8) through the second check valve (A10), the hydraulic control stop valve (A8) is connected to the lifting hydraulic cylinder (A1), the hand control stop valve is connected to the tilt hydraulic cylinder (A3) through the first check valve (A6), and the hand control stop valve is connected to the hydraulic oil tank (A13). ​ The tilt hydraulic cylinder throttle valve (A5) is connected with the first check valve (A6) at one end and connected with the tilt hydraulic cylinder (A3) and the hydraulic control stop valve (A8) at the other end, and is used for establishing the control pressure of the hydraulic control stop valve (A8) and adjusting the retracting speed of the tilt hydraulic cylinder (A3).

8. The hydraulic system for lifting and tilting a cab according to claim 7, characterized in that: The hand control stop valve comprises an indoor hand control stop valve (A11) and an outdoor hand control stop valve (A12), the indoor hand control stop valve (A11) is connected with the outdoor hand control stop valve (A12), the indoor hand control stop valve (A11) and the outdoor hand control stop valve (A12) are connected with the second check valve (A10) and the first check valve (A6), and the indoor hand control stop valve (A11) and the outdoor hand control stop valve (A12) are connected with the hydraulic oil tank (A13).

9. The hydraulic system for raising and tilting a cab according to claim 7, wherein: The lifting hydraulic cylinder throttle valve (A9) is further included; The lifting hydraulic cylinder throttle valve (A9) is connected with the second check valve (A10) at one end and connected with the hydraulic control stop valve (A8) at the other end, and is used for adjusting the extending speed of the lifting hydraulic cylinder (A1).

10. The hydraulic system for lifting and tilting a cab according to claim 7, characterized in that: The one-way throttle valve (A7) is further included, the one-way throttle valve (A7) is connected with the hydraulic control stop valve (A8), and is used for adjusting the reset speed of the hydraulic control stop valve (A8).

11. The control method of the hydraulic system for lifting and tilting a cab according to claim 1, characterized in that: When the stop valve group is in the closed state, the pilot control end (A14) inputs a pressure signal to the control valve group, the pressure oil of the high-pressure oil source (A15) enters the tilt hydraulic cylinder (A3) through the control valve group, drives the tilt hydraulic cylinder (A3) to extend or retract, and drives the cab to tilt; The pilot control end (A14) inputs a pressure signal to the control valve group, the pressure oil of the high-pressure oil source (A15) enters the lifting hydraulic cylinder (A1) through the control valve group, drives the lifting hydraulic cylinder (A1) to extend or retract, and drives the cab to lift; When the pilot control end (A14) and the high-pressure oil source (A15) fail, the negative pressure cavities of the lifting hydraulic cylinder (A1) and the tilt hydraulic cylinder (A3) are replenished with oil from the hydraulic oil tank (A13) through the control valve group, and the pressure oil in the positive pressure cavities of the lifting hydraulic cylinder (A1) and the tilt hydraulic cylinder (A3) flows into the hydraulic oil tank (A13) through the stop valve group, and the cab falls and descends.

12. The control method of the hydraulic system for lifting and tilting a cab according to claim 3, characterized in that: When the stop valve group is in the closed state, the pilot control end (A14) inputs a pressure signal to the tilt hydraulic control reversing valve group (A16), the pressure signal controls the pressure oil of the high-pressure oil source (A15) to enter the tilt hydraulic cylinder (A3) through the tilt hydraulic control reversing valve group (A16), drives the tilt hydraulic cylinder (A3) to extend or retract, and drives the cab to tilt. The pilot control end (A14) inputs pressure signal to the lift hydraulic control reversing valve group (A17), and the pressure signal controls the pressure oil of the high pressure oil source (A15) to enter the lift hydraulic cylinder (A1) through the lift hydraulic control reversing valve group (A17) to drive the lift hydraulic cylinder (A1) to extend or retract to drive the cab to lift or fall; When the pilot control end (A14) and the high pressure oil source (A15) fail, the cab is in the state of lifting and tilting, and the stop valve group is opened; at this time, the tilting hydraulic cylinder (A3) retracts under the self weight of the cab, the negative pressure cavity of the tilting hydraulic cylinder (A3) is supplied with oil from the hydraulic oil tank (A13) through the tilting hydraulic control reversing valve group (A16), and the pressure oil of the positive pressure cavity of the tilting hydraulic cylinder (A3) flows into the hydraulic oil tank (A13) through the stop valve group, so that the tilting hydraulic cylinder (A3) retracts, and the cab falls back; The lift hydraulic cylinder (A1) extends under the self weight of the cab, the negative pressure cavity of the lift hydraulic cylinder (A1) is supplied with oil from the hydraulic oil tank (A13) through the lift hydraulic control reversing valve group (A17), and the pressure oil of the positive pressure cavity of the lift hydraulic cylinder (A1) flows into the hydraulic oil tank (A13) through the stop valve group, so that the lift hydraulic cylinder (A1) extends, and the cab falls.

13. The control method of the lifting and tilting hydraulic system of the cab according to claim 4, characterized in that: When the stop valve group is in the closed state, the gear for controlling the lift hydraulic cylinder (A1) is opened, the pilot control end (A14) inputs pressure signal to the hydraulic control reversing valve group (B16) to control the pressure oil of the high pressure oil source (A15) to enter the lift hydraulic cylinder (A1) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, drive the lift hydraulic cylinder (A1) to extend or retract, and drive the cab to lift or fall; The gear for controlling the tilting hydraulic cylinder (A3) is opened, the pilot control end (A14) inputs pressure signal to the hydraulic control reversing valve group (B16) to control the pressure oil of the high pressure oil source (A15) to enter the tilting hydraulic cylinder (A3) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, drive the tilting hydraulic cylinder (A3) to retract or extend, and drive the cab to tilt; The gears for controlling the lift hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3) are opened, the pilot control end (A14) inputs pressure signal to the hydraulic control reversing valve group (B16) to control the pressure oil of the high pressure oil source (A15) to enter the lift hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, drive the lift hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3) to extend or retract, and drive the cab to lift and tilt. ​ ​ ​ ​ When the pilot control end (A14) and the high-pressure oil source (A15) fail and the cab is in a rising and tilting state, the stop valve group is opened; at this time, the tilting hydraulic cylinder (A3) is retracted under the weight of the cab, the negative pressure cavity of the tilting hydraulic cylinder (A3) is supplied with oil from the hydraulic oil tank (A13) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, and the pressure oil in the positive pressure cavity of the tilting hydraulic cylinder (A3) flows into the hydraulic oil tank (A13) through the stop valve group, so that the tilting hydraulic cylinder (A3) is retracted, that is, the cab falls back. The lifting hydraulic cylinder (A1) extends under the weight of the cab, the negative pressure cavity of the lifting hydraulic cylinder (A1) is supplied with oil from the hydraulic oil tank (A13) through the hydraulic control reversing valve group (B16) and the electric control stop valve group, and the pressure oil in the positive pressure cavity of the lifting hydraulic cylinder (A1) flows into the hydraulic oil tank (A13) through the stop valve group, so that the lifting hydraulic cylinder (A1) extends, that is, the cab falls.

14. The control method of the lifting and tilting hydraulic system of the cab according to claim 6, characterized in that: When the stop valve group is in a closed state and the B19a gear is in a pressed state, the pressure signal of the pilot control end (A14) is input to the hydraulic control reversing valve group (B16) to control the pressure oil of the high-pressure oil source (A15) to enter the tilting hydraulic cylinder (A3) through the hydraulic control reversing valve group (B16), the first electric control stop valve (B17a) or the third electric control stop valve (B18a), drive the tilting hydraulic cylinder (A3) to retract or extend, and drive the cab to tilt; when the B19c gear is in a pressed state, the pressure signal of the pilot control end (A14) is input to the hydraulic control reversing valve group (B16) to control the pressure oil of the high-pressure oil source (A15) to enter the lifting hydraulic cylinder (A1) through the hydraulic control reversing valve group (B16), the second electric control stop valve (B17b) or the fourth electric control stop valve (B18b), drive the lifting hydraulic cylinder (A1) to extend or retract, and drive the cab to lift; when the automatic reset switch (B19) is in a non-pressed state, the pressure signal of the pilot control end (A14) is input to the hydraulic control reversing valve group (B16) to control the pressure oil of the high-pressure oil source (A15) to enter the lifting hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3) through the hydraulic control reversing valve group (B16), the first electric control stop valve group (B17) or the second electric control stop valve group (B18), drive the lifting hydraulic cylinder (A1) and the tilting hydraulic cylinder (A3) to extend or retract, and drive the cab to lift and tilt.

15. The control method of the lifting and tilting hydraulic system of the cab according to claim 7, characterized in that: ​ When the pilot control end (A14) and the high-pressure oil source (A15) fail, the cab is in a state of rising and tilting upward, the control chamber hand control cut-off valve (A11) or the chamber outdoor hand control cut-off valve (A12) is opened; at this time, the tilting hydraulic cylinder (A3) is retracted under the weight of the cab, the negative pressure cavity of the tilting hydraulic cylinder (A3) is supplied with oil from the hydraulic oil tank (A13) through the control valve group, and the pressure oil of the positive pressure cavity of the tilting hydraulic cylinder (A3) flows into the hydraulic oil tank (A13) through the first one-way valve (A6) and the hand control cut-off valve; at this time, the hydraulic control cut-off valve (A8) is in a cut-off state, thereby preventing the pressure oil of the positive pressure cavity of the lifting hydraulic cylinder (A1) from flowing into the hydraulic oil tank (A13); after the tilting hydraulic cylinder (A3) is completely retracted, i.e., the cab is completely lowered, the hydraulic control cut-off valve (A8) is in a communication state, the lifting hydraulic cylinder (A1) is extended under the weight of the cab, the negative pressure cavity of the lifting hydraulic cylinder (A1) is supplied with oil from the hydraulic oil tank (A13) through the control valve group, and the pressure oil of the positive pressure cavity of the lifting hydraulic cylinder (A1) flows into the hydraulic oil tank (A13) through the hydraulic control cut-off valve (A8), the second one-way valve (A10) and the hand control cut-off valve, until the lifting hydraulic cylinder (A1) is completely extended, i.e., the cab is completely lowered. ​

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