Saddle lifting hydraulic system with integrated oil tank

Abstract

The saddle lifting hydraulic system with the integrated oil tank comprises a lifting oil cylinder, an oil tank assembly, a gear pump, a lifting platform and a saddle, the saddle is connected to the lifting platform, a piston rod assembly is movably arranged in the lifting oil cylinder, the output end of the piston rod assembly is movably connected with the lifting platform, and the output end of the piston rod assembly is movably connected with the oil tank assembly. The piston rod assembly divides an inner cavity of the lifting oil cylinder into a rod cavity and a rodless cavity, a containing cavity is formed in the oil tank assembly, a control valve set is integrated in the containing cavity, the control valve set is fixedly connected with the oil tank assembly and comprises an H-shaped three-position four-way reversing valve, and an oil supply port P, an oil return port T, a working port A and a working port B are formed in the H-shaped three-position four-way reversing valve. An oil outlet of the oil tank is connected with an oil supply port P through a gear pump, an oil return port T is connected with an oil return port of the oil tank, the control valve set and the oil tank assembly are integrated, the structure is compact, and hydraulic pipeline connection is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of towing vehicle, especially a saddle lifting hydraulic system with integrated oil tank. BACKGROUND

[0002] The saddle lifting hydraulic system realizes the lifting and fixing of the saddle through hydraulic power. The system is mainly composed of a hydraulic pump, a hydraulic cylinder, a control valve, an oil tank and a pipeline, etc. The hydraulic pump draws hydraulic oil from the oil tank and delivers high-pressure oil to the hydraulic cylinder through the adjustment of the control valve. The piston in the hydraulic cylinder reciprocates under the action of high-pressure oil, thereby driving the connected saddle to lift. Precise control of the pressure and flow of the hydraulic system can realize the stable lifting and accurate positioning of the saddle, ensuring the stable operation of the equipment and the safety of the operation. In the design process of the traditional saddle lifting hydraulic system, the control valve group and the oil tank assembly are often designed independently and need to be connected through a series of complex pipelines. This design not only consumes a lot of time and manpower, but also is prone to errors in actual operation, especially when the distance between the control valve group and the oil tank assembly is relatively far, the length of the required hydraulic pipeline will increase accordingly. This not only increases the complexity of the hydraulic system, making the maintenance and troubleshooting of the system more difficult, but also may increase the potential risk of leakage. SUMMARY

[0003] The utility model aims at the defects and deficiencies of the prior art, and provides a saddle lifting hydraulic system with an integrated oil tank, which is simple and reasonable in structure and easy to operate. The control valve group and the oil tank assembly are integrated, making the overall structure more compact and saving space. The connection of the hydraulic pipeline becomes more convenient and fast, and the length of the hydraulic pipeline is significantly reduced, and the potential risk of leakage is also reduced.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a saddle lifting hydraulic system with integrated oil tank, including lifting cylinder, oil tank assembly, gear pump, lifting platform and saddle, the saddle is movably connected to the lifting platform, the piston rod assembly is movably arranged in the lifting cylinder, the output of piston rod assembly is movably connected with lifting platform, the piston rod assembly divides the inner chamber of lifting cylinder into rod cavity and rodless cavity, be provided with the accommodation cavity in the oil tank assembly, the control valve group is integrated in the accommodation cavity, and the control valve group is fixedly connected with the oil tank assembly, the control valve group includes H type three position four way reversing valve, H type three position four way reversing valve is provided with oil supply P mouth, oil return T mouth, work A mouth and work B mouth respectively, work A mouth is connected with rodless cavity, work B mouth is connected with rod cavity, oil tank outlet and oil tank return port are provided on the oil tank assembly, the oil tank outlet is connected with oil supply P mouth through gear pump, oil return T mouth is connected with oil tank return port, H type three position four way reversing valve has first station, second station and third station, when being located first station, oil supply P mouth is communicated with work A mouth, work B mouth is communicated with oil return T mouth, when being located second station, oil supply P mouth, oil return T mouth, work A mouth and work B mouth on H type three position four way reversing valve all are communicated, and H type three position four way reversing valve is in pressure maintaining state, when being located third station, oil supply P mouth is communicated with work B mouth, work A mouth is communicated with oil return T mouth.

[0006] Further, the first mounting hole is arranged on the control valve group, the second mounting hole corresponding to the first mounting hole is arranged on the bottom of the accommodation cavity, the mounting screw is arranged in the second mounting hole, and the mounting screw is fixedly connected into the first mounting hole through the second mounting hole.

[0007] Further, the control valve group further includes a first balance valve and a second balance valve, the work A mouth is connected with the rodless cavity through the first balance valve, the work B mouth is connected with the rod cavity through the second balance valve, the work B mouth is further connected with the first balance valve through the first pilot oil way, and the work A mouth is further connected with the second balance valve through the second pilot oil way.

[0008] Further, a plurality of pressure measuring connectors are further arranged on the control valve group.

[0009] Further, the control valve group further includes a throttle valve, a first oil way is arranged between the second balance valve and the rod cavity, a second oil way is arranged between the second balance valve and the oil tank return port, and the throttle valve is arranged on the second oil way.

[0010] Further, the control valve group further includes an overflow valve, a third oil way is arranged between the gear pump and the oil supply P mouth, a fourth oil way is arranged between the gear pump and the oil tank return port, and the overflow valve is arranged on the fourth oil way.

[0011] Further, the lifting oil cylinder is provided with two, two the lifting oil cylinder is provided with three oil passage blocks between control valve group, first chamber and second chamber that is linked with the rodless chamber respectively in the three oil passage blocks is equipped, through the first chamber, hydraulic oil is evenly distributed to two lifting oil cylinder's rodless chamber, through the second chamber, hydraulic oil is evenly distributed to two lifting oil cylinder's rod chamber.

[0012] Further, it further includes the frame, the lifting platform is movably connected to the frame, the first end of the lifting platform is movably connected with the frame through the first rotating shaft, the lifting platform can rotate around the axis of the first rotating shaft, the second end of the lifting platform is movably connected with the frame through the second rotating shaft, the output end of the piston rod assembly is fixedly connected with the second rotating shaft, the lifting platform can rotate around the axis of the second rotating shaft, the saddle is movably connected to the lifting platform through the third rotating shaft, the saddle is fixedly connected with the third rotating shaft, and the lifting platform can rotate around the axis of the third rotating shaft.

[0013] Further, the mounting plate is fixedly connected to the frame, and the oil tank assembly is fixedly connected to the mounting plate.

[0014] Further, the support is further fixedly connected to the frame, and the end of the lifting oil cylinder away from the output end of the piston rod assembly is movably connected with the support through the fourth rotating shaft, and the lifting oil cylinder can rotate around the axis of the fourth rotating shaft.

[0015] The saddle lifting hydraulic system with integrated oil tank has the advantages that the control valve group and the oil tank assembly are integrated, so that the overall structure is more compact, space is saved, and the layout of the equipment is more reasonable; in addition, the integrated design makes the connection of the hydraulic pipeline more convenient and fast; in the traditional design, the control valve group and the oil tank assembly are usually separated and need to be connected through a series of hydraulic pipelines, which not only consumes time and effort, but also is prone to errors; the integrated design greatly simplifies the process, reduces the time and cost of installation and maintenance, and significantly reduces the length of the hydraulic pipeline; in the traditional hydraulic system, the long hydraulic pipeline not only increases the complexity of the system, but also may cause more potential leakage points; by shortening the length of the pipeline, the complexity of the hydraulic system is reduced, and the potential leakage risk is reduced, so that the reliability and stability of the entire system are improved; the integrated design also brings convenience in maintenance; since the control valve group and the oil tank assembly are integrated, the operator can more conveniently access and check each component during daily inspection and maintenance, which not only improves the maintenance efficiency, but also reduces the maintenance cost and ensures the long-term stable operation of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the structure schematic view of the saddle lifting system in the lowering state in the utility model;

[0017] Figure 2 is the structure schematic view of the saddle lifting system in the lifting state in the utility model;

[0018] Figure 3 is the structure schematic view of the control valve group in the utility model;

[0019] Figure 4 is the structure schematic view of the control valve group integrated on the oil tank assembly in the utility model;

[0020] Figure 5 is the structure schematic view of the control valve group and the oil tank assembly in the utility model when being separated.

[0021] Figures 1-5 In the middle: 1, frame; 11, support; 111, third rotating shaft; 2, oil tank assembly; 21, oil tank oil outlet; 22, oil tank oil return; 23, containing cavity; 24, mounting screw; 3, control valve group; 31, H type three-position four-way reversing valve; 32, pressure measuring connector; 33, first balance valve; 34, throttle valve; 35, overflow valve; 36, first mounting hole; 37, oil port; 38, second balance valve; 4, gear pump; 5, mounting plate; 6, lifting platform; 61, first rotating shaft; 62, second rotating shaft; 63, connecting platform; 7, lifting oil cylinder; 71, piston rod; 8, three-way oil way block; 9, saddle. DETAILED DESCRIPTION

[0022] The utility model will be further described below in combination with the drawings.

[0023] As Figures 1-5The saddle lifting hydraulic system with integrated oil tank shown in the embodiment comprises a lifting oil cylinder 7, an oil tank assembly 2, a gear pump 4, a lifting platform 6 and a saddle 9, the saddle 9 is movably connected to the lifting platform 6, a piston rod assembly is movably arranged in the lifting oil cylinder 7, the piston rod assembly comprises a piston and a piston rod 71, the piston is fixedly connected with the piston rod 71, the piston rod assembly divides the inner cavity of the lifting oil cylinder 7 into a rod cavity and a rodless cavity, preferably, in the embodiment, the lifting oil cylinder 7 is a double-acting single-stage oil cylinder, which can exert force in two directions, i.e. can perform extension action and retraction action under the action of hydraulic oil, the output end of the piston rod assembly is movably connected with the lifting platform 6 to push the lifting platform 6 to lift or lower, preferably, the embodiment further comprises a vehicle frame 1, the lifting platform 6 is movably connected to the vehicle frame 1, the first end of the lifting platform 6 is movably connected with the vehicle frame 1 through a first rotating shaft 61, the lifting platform 6 can rotate around the axis of the first rotating shaft 61, the second end of the lifting platform 6 is movably connected with the vehicle frame 1 through a second rotating shaft 62, the output end of the piston rod assembly is fixedly connected with the second rotating shaft 62, the lifting platform 6 can rotate around the axis of the second rotating shaft 62, the saddle 9 is movably connected to the lifting platform 6 through a third rotating shaft 111, the saddle 9 is fixedly connected with the third rotating shaft 111, the lifting platform 6 can rotate around the axis of the third rotating shaft 111, preferably, a connecting platform 63 is further arranged on the second end of the lifting platform 6 to connect and fix the support saddle 9, specifically, when the piston rod assembly extends or retracts, the lifting platform 6 rotates around the first rotating shaft 61, the second rotating shaft 62 and the third rotating shaft 111, the oil tank assembly 2 is provided with a containing cavity 23, the containing cavity 23 is integrated with a control valve group 3, the control valve group 3 is fixedly connected with the oil tank assembly 2, refer to Figure 5Preferably, in this embodiment, the control valve group 3 is provided with a first mounting hole 36, the bottom of the accommodating cavity 23 is provided with a second mounting hole corresponding to the first mounting hole 36, and a mounting screw 24 is arranged in the second mounting hole and fixedly connected into the first mounting hole 36, ensuring the stable and reliable connection between the control valve group 3 and the oil tank assembly 2, integrating the control valve group 3 and the oil tank assembly 2, making the overall structure more compact, saving space, and making the layout of the equipment more reasonable. Secondly, this integrated design also makes the connection of the hydraulic pipeline more convenient and fast. In the traditional design, the control valve group 3 and the oil tank assembly 2 are usually separated and need to be connected through a series of hydraulic pipelines, which not only consumes time and effort, but also is prone to errors. The integrated design greatly simplifies this process, reduces the installation and maintenance time and cost, and significantly reduces the length of the hydraulic pipeline. In the traditional hydraulic system, the longer hydraulic pipeline not only increases the complexity of the system, but also may cause more potential leakage points. By shortening the length of the pipeline, the complexity of the hydraulic system is reduced, and the potential leakage risk is reduced, thereby improving the reliability and stability of the entire system. The integrated design also brings convenience in maintenance. Since the control valve group 3 and the oil tank assembly 2 are integrated, the operator can more conveniently access and inspect each component during routine inspection and maintenance, which not only improves maintenance efficiency but also reduces maintenance costs, ensuring long-term stable operation of the equipment.

[0024] Preferably, in this embodiment, to ensure that the lifting platform 6 moves safely and smoothly, two lifting oil cylinders 7 are provided, and a three-way oil way block 8 is arranged between the two lifting oil cylinders 7 and the control valve group 3. The three-way oil way block 8 is respectively provided with a first chamber and a second chamber that are in communication with the rodless cavity. The hydraulic oil is uniformly distributed to the rodless cavities of the two lifting oil cylinders 7 through the first chamber, and the hydraulic oil is uniformly distributed to the rod cavities of the two lifting oil cylinders 7 through the second chamber.

[0025] Specifically, referring to Figure 4, the control valve group 3 is provided with a plurality of oil port 37, through the hydraulic pipeline and oil tank assembly 2, three-way oil way block 8 and gear pump 4 are connected; the control valve group 3 includes H type three-position four-way reversing valve 31, first balance valve 33 and second balance valve 38, the H type three-position four-way reversing valve 31 is provided with oil supply P port, oil return T port, work A port and work B port respectively, the work A port is connected with rodless cavity through the first balance valve 33, the work B port is connected with the rod cavity through the second balance valve 38, the work B port is also connected with the first balance valve 33 through the first pilot oil way, the work A port is also connected with the second balance valve 38 through the second pilot oil way, the oil tank assembly 2 is provided with oil tank oil outlet 21 and oil tank oil return 22, the oil tank oil outlet 21 is connected with the oil supply P port through the gear pump 4, for providing hydraulic oil for the system, specifically, the oil tank oil outlet 21 is connected with the gear pump 4 oil inlet, the gear pump 4 oil outlet is connected with the oil supply P port, the gear pump 4 works to convert low pressure oil into high pressure oil into the oil supply P port, the gear pump 4 is connected with the whole vehicle driving component through the input shaft, and the power is derived from the vehicle engine power takeoff or drive motor; the oil return T port is connected with the oil tank oil return 22, for recycling the hydraulic oil returned during system work to the oil tank assembly 2, the H type three-position four-way reversing valve 31 has first station, second station and third station, when being located at the first station, the oil supply P port is communicated with the work A port, one way high pressure oil opens the first balance valve 33 and enters the rodless cavity, pushes the piston rod assembly to stretch out, refer to Figure 2 , and further pushes the lifting platform 6 to realize lifting, another high pressure oil opens the second balance valve 38 through the second pilot oil way, so that the low pressure oil in the rod cavity can return to the H type three-position four-way reversing valve 31 through the second balance valve 38, the work B port is communicated with the oil return T port, and the low pressure oil in the rod cavity is sent back to the oil tank assembly 2; when being located at the second station, the oil supply P port, the oil return T port, the work A port and the work B port on the H type three-position four-way reversing valve 31 are all communicated, the system has no oil pressure, the H type three-position four-way reversing valve 31 is in pressure maintaining state, that is, the rod cavity and the rodless cavity of the lifting cylinder 7 are in pressure maintaining state, the piston rod 71 of the lifting cylinder 7 is not passively stretched out or retracted, and there is no relative movement between the piston rod 71 of the lifting cylinder 7 and the cylinder barrel of the lifting cylinder 7, so as to ensure that the lifting platform 6 is in a static state relative to the vehicle frame 1, and the saddle 9 keeps the height unchanged; when being located at the third station, the oil supply P port is communicated with the work B port, one way high pressure oil opens the second balance valve 38 and enters the rod cavity, pushes the piston rod assembly to retract, refer to Figure 1 , and further controls the lifting platform 6 to realize descending, another high pressure oil opens the first balance valve 33 through the first pilot oil way, so that the low pressure oil in the rodless cavity can return to the H type three-position four-way reversing valve 31 through the first balance valve 33, the work A port is communicated with the oil return T port, and the low pressure oil in the rodless cavity is sent back to the oil tank assembly 2.

[0026] Preferably, in this embodiment, referring to Figures 1-2 , the mounting plate 5 is fixedly connected to the frame 1, and the oil tank assembly 2 is fixedly connected to the mounting plate 5. Specifically, a plurality of third mounting holes are formed in the mounting plate 5 for connecting and fixing the oil tank assembly 2 to the frame 1.

[0027] Preferably, in this embodiment, referring to Figures 1-2 , the frame 1 is further fixedly connected to the support 11, and the lifting oil cylinder 7 is movably connected to the support 11 through a fourth rotating shaft at an end away from the piston rod assembly output end. The lifting oil cylinder 7 can rotate around the axis of the fourth rotating shaft.

[0028] Preferably, in this embodiment, referring to Figure 3 , a plurality of pressure measuring connectors 32 are further arranged on the control valve group 3. Specifically, the oil outlet of the gear pump 4 and the oil inlets and outlets of the lifting oil cylinder 7 are all provided with pressure measuring connectors 32, allowing the operator to use corresponding pressure measuring tools to detect the oil pressure value at a specific position. This design greatly facilitates the detection and debugging work of the system in the early stage, and also provides great convenience for later maintenance and inspection. Of course, in other embodiments, other numbers of pressure measuring connectors 32 can be arranged as needed to meet the detection needs in different situations.

[0029] Preferably, in this embodiment, referring to Figure 3 , the control valve group 3 further includes a throttle valve 34. A first oil passage is arranged between the second balance valve 38 and the rod cavity, and a second oil passage is arranged between the second balance valve 38 and the oil tank return oil port 22. Hydraulic oil can also return to the oil tank through the second oil passage. The throttle valve 34 is arranged on the second oil passage to control the hydraulic oil flow of the second oil passage. It should be noted that the valve opening of the throttle valve 34 is set to be very small. When the system is lifting or descending, only a small part of the oil returns to the oil tank through the second oil passage. Specifically, when the system is lifting, the hydraulic oil in the rod cavity returns to the oil tank through the second balance valve 38 and the H-type three-position four-way directional valve 31, and returns to the oil tank through the second oil passage. When the driver wants to perform the uncoupling operation of the tractor and the trailer, the system needs to be lowered. Since the valve opening of the throttle valve 34 is set to be very small, the hydraulic oil from the working B port can also establish oil pressure, ensuring that the hydraulic oil from the working B port opens the first balance valve 33 through the first pilot oil passage, so that the hydraulic oil in the rodless cavity can return to the oil tank. After the second balance valve 38 is opened by the hydraulic oil from the working B port, the hydraulic oil is divided into two paths, one of which enters the rod cavity through the first oil passage, and the other of which returns to the oil tank through the second oil passage. When the gear pump 4 stops working, since the throttle valve 34 has a small opening, although the working B port has no pressure, the piston rod assembly of the lifting oil cylinder 7 will also have damping when it moves, which can play a function similar to pressure maintaining for the rod cavity.

[0030] Preferably, in the embodiment, referring to Figure 3 , the control valve group 3 further comprises an overflow valve 35, a third oil path is arranged between the gear pump 4 and the oil supply port P, a fourth oil path is arranged between the gear pump 4 and the oil tank return port 22, and the overflow valve 35 is arranged on the fourth oil path. The overflow valve 35 functions to limit the hydraulic oil pressure value entering the system. When the oil pressure is lower than the set value, the overflow valve 35 does not work. When the oil pressure value is higher than the set value, the internal valve core of the overflow valve 35 opens, and part of the hydraulic oil is discharged into the oil tank, so as to ensure that the pressure value does not exceed the set value, thereby playing a role in protecting the system.

[0031] Preferably, in the embodiment, the H-type three-position four-way reversing valve 31 is an H-type three-position four-way electro-hydraulic reversing valve. The H-type three-position four-way electro-hydraulic reversing valve comprises a small valve and a main valve. The small valve is used to control the oil path switching of the main valve. Hydraulic oil first enters the small valve, and then enters the main valve through the small valve after the oil path of the small valve is switched, so as to control the switching of the main valve. The main valve has the first working position, the second working position and the third working position. The small valve has a fourth working position, a fifth working position and a sixth working position. When the small valve is in the fourth working position, hydraulic oil enters the main valve through the small valve, and the oil path of the main valve is switched to the first working position. When the small valve is in the fifth working position, the small valve is closed, no hydraulic oil enters the main valve, and the oil path of the main valve is switched to the second working position under the action of the spring of the main valve. When the small valve is in the fifth working position, hydraulic oil enters the main valve through the small valve, and the oil path of the main valve is switched to the sixth working position.

[0032] The above only describes the preferred embodiments of the present application, and equivalent changes or modifications made according to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.

Claims

1. A saddle lifting hydraulic system with integrated oil tank, comprising a lifting cylinder (7), an oil tank assembly (2), a gear pump (4), a lifting platform (6) and a saddle (9), the saddle (9) being movably connected to the lifting platform (6), a piston rod assembly being movably arranged in the lifting cylinder (7), an output end of the piston rod assembly being movably connected to the lifting platform (6), the piston rod assembly separating an inner cavity of the lifting cylinder (7) into a rod cavity and a rodless cavity, characterized in that: The oil tank assembly (2) is provided with a containing cavity (23), the containing cavity (23) is integrated with a control valve group (3), the control valve group (3) is fixedly connected with the oil tank assembly (2), the control valve group (3) includes an H-shaped three-position four-way directional valve (31), the H-shaped three-position four-way directional valve (31) is respectively provided with an oil supply P port, an oil return T port, a working A port and a working B port, the working A port is connected with the rodless cavity, the working B port is connected with the rod cavity, the oil tank assembly (2) is provided with an oil tank oil outlet (21) and an oil tank oil return port (22), the oil tank oil outlet (21) is connected with the oil supply P port through a gear pump (4), the oil return T port is connected with the oil tank oil return port (22), the H-shaped three-position four-way directional valve (31) has a first position, a second position and a third position, when being located at the first position, the oil supply P port is communicated with the working A port, the working B port is communicated with the oil return T port, when being located at the second position, the oil supply P port, the oil return T port, the working A port and the working B port on the H-shaped three-position four-way directional valve (31) are all communicated, the H-shaped three-position four-way directional valve (31) is in a pressure maintaining state, when being located at the third position, the oil supply P port is communicated with the working B port, the working A port is communicated with the oil return T port. ​ 2. A hydraulic system for lifting a saddle having an integrated tank according to claim 1, characterized in that: The control valve group (3) is provided with a first mounting hole (36), the bottom of the containing cavity (23) is provided with a second mounting hole corresponding to the first mounting hole (36), the second mounting hole is provided with a mounting screw (24), and the mounting screw (24) is fixedly connected into the first mounting hole (36) through the second mounting hole.

3. A hydraulic system for lifting a saddle having an integrated oil tank as claimed in claim 1, characterized in that: The control valve group (3) further includes a first balance valve (33) and a second balance valve (38), the working A port is connected with the rodless cavity through the first balance valve (33), the working B port is connected with the rod cavity through the second balance valve (38), the working B port is further connected with the first balance valve (33) through a first pilot oil way, and the working A port is further connected with the second balance valve (38) through a second pilot oil way.

4. The hydraulic system for lifting a saddle having an integrated oil tank according to claim 1, characterized in that: The control valve group (3) is further provided with a plurality of pressure measuring connectors (32).

5. A hydraulic saddle-lift system with integrated oil tank according to claim 3, characterized in that: The control valve group (3) further includes a throttle valve (34), a first oil way is arranged between the second balance valve (38) and the rod cavity, a second oil way is arranged between the second balance valve (38) and the oil tank oil return port (22), and the throttle valve (34) is arranged on the second oil way.

6. A hydraulic saddle-lift system with integrated oil tank according to claim 1, characterized in that: The control valve group (3) further includes an overflow valve (35), a third oil way is arranged between the gear pump (4) and the oil supply P port, a fourth oil way is arranged between the gear pump (4) and the oil tank oil return port (22), and the overflow valve (35) is arranged on the fourth oil way.

7. A hydraulic saddle-lift system with integrated oil tank according to claim 1, characterized in that: The lifting oil cylinder (7) is provided with two, two lifting oil cylinder (7) and control valve group (3) between the three oil circuit block (8) is provided with, the three oil circuit block (8) is respectively equipped with with the first chamber and with the second chamber which are communicated with the rodless cavity, through the first chamber will be evenly distributed to two lifting oil cylinder (7) rodless cavity hydraulic oil, through the second chamber will be evenly distributed to two lifting oil cylinder (7) rod cavity hydraulic oil.

8. The hydraulic system for lifting a saddle having an integrated oil tank according to claim 1, characterized in that: Also includes the frame (1), the lifting platform (6) is movably connected to the frame (1), the first end of the lifting platform (6) is movably connected with the frame (1) through the first rotating shaft (61), the lifting platform (6) can rotate around the axis of the first rotating shaft (61), the second end of the lifting platform (6) is movably connected with the frame (1) through the second rotating shaft (62), the output end of the piston rod assembly is fixedly connected with the second rotating shaft (62), the lifting platform (6) can rotate around the axis of the second rotating shaft (62), the saddle (9) is movably connected to the lifting platform (6) through the third rotating shaft (111), the saddle (9) is fixedly connected with the third rotating shaft (111), the lifting platform (6) can rotate around the axis of the third rotating shaft (111).

9. A hydraulic saddle-lift system with integrated oil tank according to claim 8, characterized in that: The frame (1) is fixedly connected with the mounting plate (5), and the oil tank assembly (2) is fixedly connected to the mounting plate (5).

10. A hydraulic saddle-lift system with integrated oil tank according to claim 8, characterized in that: The frame (1) is further fixedly connected with the support (11), and one end of the lifting oil cylinder (7) away from the output end of the piston rod assembly is movably connected with the support (11) through the fourth rotating shaft, and the lifting oil cylinder (7) can rotate around the axis of the fourth rotating shaft.

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