A hydraulic system of a variable-capacity display vehicle and a display vehicle

Abstract

The present invention relates to the technical field of the hydraulic system of a display vehicle, and more specifically, to a hydraulic system and a display vehicle for a variable-volume display vehicle, which include a double-pump, a tipping cylinder group, a rotary cylinder group, a main vehicle outrigger cylinder group, a variable-volume outrigger cylinder group, an extension cylinder group, a lifting cylinder group, and a fuel tank; one oil pump in the double-pump can independently supply oil to the tipping cylinder group and the rotary cylinder group through a first oil outlet, and the other oil pump can independently supply oil to the main vehicle outrigger cylinder group, the variable-volume outrigger cylinder group, the extension cylinder group, and the lifting cylinder group through a second oil outlet; so that the oil supply to the tipping cylinder group and the rotary cylinder group is not affected by the oil supply to the main vehicle outrigger cylinder group, the variable-volume outrigger cylinder group, the extension cylinder group, and the lifting cylinder group, preventing oil seizure, and at the same time, it can also accelerate the action speed of the tipping cylinder group, the rotary cylinder group, the main vehicle outrigger cylinder group, the variable-volume outrigger cylinder group, the extension cylinder group, and the lifting cylinder group.

Description

Technical Field

[0001] The present invention relates to the technical field of the hydraulic system of a display vehicle, and more specifically, to a hydraulic system and a display vehicle for a variable-volume display vehicle. Background Art

[0002] A variable-volume display vehicle, that is, a mobile exhibition hall, is to set the exhibition hall on a specially designed vehicle, which can reduce the cost investment in a fixed exhibition hall. The variable-volume display vehicle is becoming more and more widely used today, such as a mobile advertising vehicle, product building tour promotion, exhibition, expo, exhibition, etc. In terms of forum lectures: it can be applied to forums, conferences, lectures, etc. In terms of celebration ceremonies: it can be applied to real estate openings, ribbon-cutting ceremonies, award ceremonies, etc. Other applications: such as wedding live broadcasts, auctions, etc. The variable-volume display vehicle mostly adopts multiple car body panels that can move relative to the car body of the variable-volume display vehicle. Driven by an oil cylinder, when it needs to be unfolded into an exhibition hall or a display platform (i.e., the use state), the car body panels are driven to unfold to expand the area of the car body accommodation space and extend out of the car body to form a display platform.

[0003] The existing hydraulic system of a display vehicle includes a first synchronous motor, a second synchronous motor, a plurality of pipe-type hydraulic locks, a plurality of stacked throttle valves, a plurality of electromagnetic directional control valves, an LED screen lifting oil cylinder, an expansion compartment oil cylinder, a main display platform oil cylinder, and a secondary display platform oil cylinder. The tops of the first synchronous motor and the second synchronous motor are respectively connected to the LED screen lifting oil cylinder and the expansion compartment oil cylinder by pipe-type hydraulic locks. The bottoms of the first synchronous motor and the second synchronous motor are respectively connected with stacked throttle valves, and the stacked throttle valves are respectively connected with electromagnetic directional control valves. The main display platform oil cylinder and the secondary display platform oil cylinder are respectively connected to the stacked throttle valves, and the stacked throttle valves are respectively connected with stacked hydraulic locks, and the stacked hydraulic locks are respectively connected with electromagnetic directional control valves.

[0004] The above-mentioned existing hydraulic system of a variable-volume display vehicle adopts single-pump operation, and problems such as oil robbing are likely to occur during the operation process, as well as problems such as asynchronous expansion, lifting, flipping or difficult control of the unfolding speed. Summary of the Invention

[0005] In order to overcome the problems of oil robbing during the operation of the hydraulic system of the variable-volume display vehicle in the above-mentioned existing technology, as well as problems such as asynchronous expansion, lifting, flipping or difficult control of the unfolding speed, the present invention provides a hydraulic system and a display vehicle for a variable-volume display vehicle.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A hydraulic system for a variable-volume display vehicle, comprising a double-pump, a tipping cylinder group, a rotary cylinder group, a main vehicle outrigger cylinder group, a variable-volume outrigger cylinder group, an expansion cylinder group, a lifting cylinder group, and a fuel tank; the double-pump is provided with a first oil outlet and a second oil outlet, the first oil outlet is connected to the tipping cylinder group through a first electromagnetic directional control valve, and the first oil outlet is connected to the rotary cylinder group through a second electromagnetic directional control valve; the second oil outlet is connected to the main vehicle outrigger cylinder group through a third electromagnetic directional control valve, the second oil outlet is connected to the variable-volume outrigger cylinder group through a fourth electromagnetic directional control valve, the second oil outlet is connected to the expansion cylinder group through a fifth electromagnetic directional control valve, and the second oil outlet is connected to the lifting cylinder group through a sixth electromagnetic directional control valve; the tipping cylinder group, the rotary cylinder group, the main vehicle outrigger cylinder group, the variable-volume outrigger cylinder group, the expansion cylinder group, the lifting cylinder group are connected to the fuel tank; the first oil outlet is connected to the second oil outlet through a first solenoid valve for controlling the on-off of the oil circuit.

[0007] The tipping cylinder group is used to turn out the display platform of the variable-volume display vehicle from the carriage; the rotary cylinder group is used to extend the rotary outriggers; the main vehicle outrigger cylinder group is used to support the carriage of the variable-volume display vehicle; the variable-volume outrigger cylinder group is used to support the expanded carriage; the expansion cylinder group is used to expand the carriage to increase its volume; the lifting cylinder group is used to control the lifting of the display screen; the first electromagnetic directional control valve is used to control the extension and retraction of the piston of the tipping cylinder group; the second electromagnetic directional control valve is used to control the extension and retraction of the piston of the rotary cylinder group; the third electromagnetic directional control valve is used to control the extension and retraction of the piston of the main vehicle outrigger cylinder group; the fourth electromagnetic directional control valve is used to control the extension and retraction of the piston of the variable-volume outrigger cylinder group; the fifth electromagnetic directional control valve is used to control the extension and retraction of the piston of the expansion cylinder group; the sixth electromagnetic directional control valve is used to control the extension and retraction of the piston of the lifting cylinder group; when the first solenoid valve is in the cut-off state, the first oil outlet of the double-pump supplies oil to the tipping cylinder group and the rotary cylinder group, and the second oil outlet supplies oil to the main vehicle outrigger cylinder group, the variable-volume outrigger cylinder group, the expansion cylinder group and the lifting cylinder group; when the first solenoid valve is in the connected state, either the first oil outlet or the second oil outlet can supply oil to the tipping cylinder group, the rotary cylinder group, the main vehicle outrigger cylinder group, the variable-volume outrigger cylinder group, the expansion cylinder group, the lifting cylinder group.

[0008] Further, the first electromagnetic directional control valve, the second electromagnetic directional control valve, the third electromagnetic directional control valve, the fourth electromagnetic directional control valve, the fifth electromagnetic directional control valve, and the sixth electromagnetic directional control valve are respectively connected to the tipping cylinder group, the rotary cylinder group, the main vehicle outrigger cylinder group, the variable-volume outrigger cylinder group, the expansion cylinder group, and the lifting cylinder group through hydraulic locks.

[0009] Further, the extension oil cylinder group includes a first front oil cylinder, a second front oil cylinder, a first rear oil cylinder, and a second rear oil cylinder; the rodless cavity of the first front oil cylinder communicates with the rod cavity of the first rear oil cylinder, and the rodless cavity of the second front oil cylinder communicates with the rod cavity of the second rear oil cylinder.

[0010] Further, the rod cavities of the first front oil cylinder and the second front oil cylinder are respectively communicated with a second solenoid valve for controlling the on-off of the oil circuit.

[0011] Further, the lifting oil cylinder group includes a lifting front oil cylinder and a lifting rear oil cylinder, and a first one-way throttle valve for controlling the retraction speed of the piston of the lifting rear oil cylinder is communicated between the lifting rear oil cylinder and the sixth electromagnetic reversing valve.

[0012] Further, the rodless cavities of each oil cylinder in the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, and the variable volume outrigger oil cylinder group are respectively communicated with a third solenoid valve for controlling the on-off of the oil circuit.

[0013] Further, a first one-way throttle valve for controlling the retraction speed of the piston of the tipping oil cylinder group is communicated between the first electromagnetic reversing valve and the tipping oil cylinder group.

[0014] Further, the first oil outlet and the second oil outlet are communicated with the fuel tank through a fourth solenoid valve for controlling the on-off of the oil circuit.

[0015] On the other hand, the present invention also provides a display vehicle, including a vehicle body, a base carriage, a first variable volume carriage, and a second variable volume carriage are provided on the vehicle body, the first variable volume carriage and the second variable volume carriage are respectively movably nested inside and outside the base carriage, and a variable volume mechanism for expanding the first variable volume carriage and the second variable volume carriage from inside and outside the base carriage to the outside is provided on the base carriage.

[0016] Further, a display platform is further provided below the first variable volume carriage, a connecting plate is provided on the display platform, a tipping oil cylinder group is provided below the first variable volume carriage, the output end of the tipping oil cylinder group is connected to the connecting plate, and the connecting plate is hinged to the first variable volume carriage at a position between the tipping driving member and the display platform.

[0017] Further, the variable volume mechanism includes a plurality of first front oil cylinders and a plurality of first rear oil cylinders; the first rear oil cylinders are installed at the bottom of the base carriage, and the first front oil cylinders are installed below the first rear oil cylinders; the output end of the first front oil cylinder is connected to the bottom of the first variable volume carriage, and the output end of the first rear oil cylinder is connected to the bottom of the second variable volume carriage.

[0018] Further, a variable volume outrigger oil cylinder group is further included, and the variable volume outrigger oil cylinder group is fixedly provided at the bottom of the second variable volume carriage.

[0019] Further, it further includes a main vehicle outrigger oil cylinder group, and the main vehicle outrigger oil cylinder group is fixedly arranged at the bottom of the base carriage.

[0020] Further, it further includes a rotary oil cylinder group, and the rotary oil cylinder group is hingedly arranged at the bottom of the first variable volume carriage.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. By using a double-pump to supply oil to the tipping oil cylinder group, the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group, one oil pump in the double-pump can independently supply oil to the tipping oil cylinder group and the rotary oil cylinder group through the first oil outlet, and the other oil pump can independently supply oil to the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group through the second oil outlet; so that the oil supply to the tipping oil cylinder group and the rotary oil cylinder group is not affected by the oil supply to the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group, preventing oil seizure, and at the same time, it can also accelerate the action speed of the tipping oil cylinder group, the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group;

[0023] 2. By communicatively arranging a first solenoid valve between the first oil outlet and the second oil outlet, when the requirement for the action speed of the tipping oil cylinder group, the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group is not high, for example, when the variable volume display vehicle is retracted, at this time, the pistons of the tipping oil cylinder group, the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group retract, and the first solenoid valve can be adjusted to the communicating state, so that the double-pump can supply oil to the tipping oil cylinder group, the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group only through the first oil outlet or the second oil outlet, reducing power consumption;

[0024] 3. By arranging hydraulic locks, after the tipping oil cylinder group, the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group complete their actions, the pistons of the tipping oil cylinder group, the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, the variable volume outrigger oil cylinder group, the extension oil cylinder group, and the lifting oil cylinder group can remain at the current position without being supplied with oil, preventing the pistons from moving by themselves under the action of external loads;

[0025] 4. By making the rodless cavity of the first front oil cylinder communicate with the rod chamber of the first rear oil cylinder, and the rodless cavity of the second front oil cylinder communicate with the rod chamber of the second rear oil cylinder, it is ensured that the volume strokes of the first rear oil cylinder and the second rear oil cylinder are equal to the volume strokes of the first front oil cylinder and the second front oil cylinder, ensuring the action synchronization between the rodless cavity of the first front oil cylinder and the first rear oil cylinder, and the rodless cavity of the second front oil cylinder and the second rear oil cylinder;

[0026] 5. By respectively connecting the rodless cavities of each oil cylinder in the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, and the variable-volume outrigger oil cylinder group with a third solenoid valve for controlling the on-off of the oil circuit, each oil cylinder in the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, and the variable-volume outrigger oil cylinder group can be individually operated. When the ground is uneven, each oil cylinder in the rotary oil cylinder group, the main vehicle outrigger oil cylinder group, and the variable-volume outrigger oil cylinder group can be individually controlled, so that each rotary outrigger, main vehicle outrigger, and variable-volume outrigger can be stably supported on the ground;

[0027] 6. The variable-volume mechanism can achieve the expansion effect by directly moving the first variable-volume carriage and the second variable-volume carriage out of the base carriage; the overall structure is simple, the expansion process is simple and easy to operate, and it can achieve first-stage variable volume or second-stage variable volume according to needs, with strong adaptability. After expansion, the space is rich and the available space is large; the display platform is extended and stored through the tilting oil cylinder group, the operation is simple, and the display platform can also provide space for users to introduce products. After the display platform is stored, it does not affect normal driving. Description of the Drawings

[0028] Figure 1 It is the oil circuit diagram of Embodiment 1 of the hydraulic system and the display vehicle of a variable-volume display vehicle of the present invention;

[0029] Figure 2 It is the oil circuit diagram of Embodiment 2 of the hydraulic system and the display vehicle of a variable-volume display vehicle of the present invention;

[0030] Figure 3 It is the oil circuit diagram of Embodiment 3 of the hydraulic system and the display vehicle of a variable-volume display vehicle of the present invention;

[0031] Figure 4 It is the internal structure schematic diagram of Embodiment 4 of the hydraulic system and the display vehicle of a variable-volume display vehicle of the present invention;

[0032] Figure 5 It is the overall structure schematic diagram of Embodiment 4 of the hydraulic system and the display vehicle of a variable-volume display vehicle of the present invention.

[0033] In the attached drawings: 1. Dual pump; 101. First oil outlet; 102. Second oil outlet; 2. Tipping oil cylinder group; 3. Rotary oil cylinder group; 4. Main vehicle outrigger oil cylinder group; 5. Variable volume outrigger oil cylinder group; 6. Extension oil cylinder group; 601. First front oil cylinder; 602. Second front oil cylinder; 603. First rear oil cylinder; 604. Second rear oil cylinder; 7. Lifting oil cylinder group; 701. Lifting front oil cylinder; 702. Lifting rear oil cylinder; 8. Fuel tank; 9. First electromagnetic directional control valve; 10. Second electromagnetic directional control valve; 11. Third electromagnetic directional control valve; 12. Fourth electromagnetic directional control valve; 13. Fifth electromagnetic directional control valve; 14. Sixth electromagnetic directional control valve; 15. First solenoid valve; 16. Check valve; 17. Relief valve; 18. Hydraulic lock; 19. Second solenoid valve; 23. First one-way throttle valve; 24. Vehicle body; 25. Base carriage; 26. First variable volume carriage; 27. Second variable volume carriage; 28. Variable volume mechanism; 29. Display platform; 30. Connecting plate; 31. Fence. Detailed implementation mode

[0034] The attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent; to better illustrate this embodiment, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted. The positional relationships described in the attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0035] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationships in the attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] The technical solutions of the present invention will be further specifically described below through specific embodiments and in combination with the attached drawings:

[0037] Embodiment 1

[0038] Refer to Figure 1, which is Embodiment 1 of the hydraulic system of a variable-volume display vehicle according to the present invention, includes a double-pump 1, a tilting cylinder group 2, a rotating cylinder group 3, a main vehicle outrigger cylinder group 4, a variable-volume outrigger cylinder group 5, an extension cylinder group 6, a lifting cylinder group 7, and a fuel tank 8; the double-pump 1 includes a first oil outlet 101 and a second oil outlet 102, the first oil outlet 101 is connected to the tilting cylinder group 2 through a first electromagnetic directional control valve 9, and the first oil outlet 101 is connected to the rotating cylinder group 3 through a second electromagnetic directional control valve 10; the second oil outlet 102 is connected to the main vehicle outrigger cylinder group 4 through a third electromagnetic directional control valve 11, the second oil outlet 102 is connected to the variable-volume outrigger cylinder group 5 through a fourth electromagnetic directional control valve 12, the second oil outlet 102 is connected to the extension cylinder group 6 through a fifth electromagnetic directional control valve 13, and the second oil outlet 102 is connected to the lifting cylinder group 7 through a sixth electromagnetic directional control valve 14; the tilting cylinder group 2, the rotating cylinder group 3, the main vehicle outrigger cylinder group 4, the variable-volume outrigger cylinder group 5, the extension cylinder group 6, the lifting cylinder group 7 are connected to the fuel tank 8; the first oil outlet 101 is connected to the second oil outlet 102 through a first solenoid valve 15 for controlling the on / off of the oil circuit.

[0039] Specifically, the tilting cylinder group 2, the rotating cylinder group 3, the main vehicle outrigger cylinder group 4, and the variable-volume outrigger cylinder group 5 each contain two cylinders of the same specification. The rodless cavities of the two cylinders in the tilting cylinder group 2 are connected, and the rod cavities of the two cylinders are also connected, so that the two cylinders in the tilting cylinder group 2 can act more synchronously. The first electromagnetic directional control valve 9, the second electromagnetic directional control valve 10, the third electromagnetic directional control valve 11, the fourth electromagnetic directional control valve 12, the fifth electromagnetic directional control valve 13, and the sixth electromagnetic directional control valve 14 are all three-position four-way electromagnetic directional control valves with Y-type neutral position functions, which have good pressure-holding effects, enabling the tilting cylinder group 2, the rotating cylinder group 3, the main vehicle outrigger cylinder group 4, the variable-volume outrigger cylinder group 5, the extension cylinder group 6, and the lifting cylinder group 7 to bear larger loads. The first oil outlet 101 and the second oil outlet 102 are respectively connected with check valves 16, and an overflow valve 17 is also connected at the first oil outlet 101 to prevent damage to the entire system due to excessive load. The first solenoid valve 15 is a normally open two-position two-way solenoid valve.

[0040] The tipping oil cylinder group 2 is used to rotate and tip out the display platform of the variable-volume display vehicle from the carriage; the rotary oil cylinder group 3 is used to rotate and extend the rotary outriggers; the main vehicle outrigger oil cylinder group 4 is used to support the carriage of the variable-volume display vehicle; the variable-volume outrigger oil cylinder group 5 is used to support the expanded carriage; the expansion oil cylinder group 6 is used to expand the carriage to increase the volume of the carriage; the lifting oil cylinder group 7 is used to control the lifting of the display screen; the first electromagnetic directional control valve 9 is used to control the extension and retraction of the piston of the tipping oil cylinder group 2; the second electromagnetic directional control valve 10 is used to control the extension and retraction of the piston of the rotary oil cylinder group 3; the third electromagnetic directional control valve 11 is used to control the extension and retraction of the piston of the main vehicle outrigger oil cylinder group 4; the fourth electromagnetic directional control valve 12 is used to control the extension and retraction of the piston of the variable-volume outrigger oil cylinder group 5; the fifth electromagnetic directional control valve 13 is used to control the extension and retraction of the piston of the expansion oil cylinder group 6; the sixth electromagnetic directional control valve 14 is used to control the extension and retraction of the piston of the lifting oil cylinder group 7; when the first solenoid valve 15 is in the cut-off state, one oil pump in the double-pump 1 can independently supply oil to the tipping oil cylinder group 2 and the rotary oil cylinder group 3 through the first oil outlet 101, and the other oil pump can independently supply oil to the main vehicle outrigger oil cylinder group 4, the variable-volume outrigger oil cylinder group 5, the expansion oil cylinder group 6, and the lifting oil cylinder group 7 through the second oil outlet 102; so that the oil supply to the tipping oil cylinder group 2 and the rotary oil cylinder group 3 is not affected by the oil supply to the main vehicle outrigger oil cylinder group 4, the variable-volume outrigger oil cylinder group 5, the expansion oil cylinder group 6, and the lifting oil cylinder group 7, preventing oil grabbing, and at the same time, it can also accelerate the action speed of the tipping oil cylinder group 2, the rotary oil cylinder group 3, the main vehicle outrigger oil cylinder group 4, the variable-volume outrigger oil cylinder group 5, the expansion oil cylinder group 6, and the lifting oil cylinder group 7; when the requirement for the action speed of the tipping oil cylinder group 2, the rotary oil cylinder group 3, the main vehicle outrigger oil cylinder group 4, the variable-volume outrigger oil cylinder group 5, the expansion oil cylinder group 6, and the lifting oil cylinder group 7 is not high, for example, when the variable-volume display vehicle is retracted, at this time, the pistons of the tipping oil cylinder group 2, the rotary oil cylinder group 3, the main vehicle outrigger oil cylinder group 4, the variable-volume outrigger oil cylinder group 5, the expansion oil cylinder group 6, and the lifting oil cylinder group 7 retract, and the first solenoid valve 15 can be adjusted to the connected state, so that the double-pump 1 can supply oil to the tipping oil cylinder group 2, the rotary oil cylinder group 3, the main vehicle outrigger oil cylinder group 4, the variable-volume outrigger oil cylinder group 5, the expansion oil cylinder group 6, and the lifting oil cylinder group 7 only through the first oil outlet 101 or the second oil outlet 102, reducing power consumption.

[0041] In this embodiment, the first electromagnetic directional control valve 9, the second electromagnetic directional control valve 10, the third electromagnetic directional control valve 11, the fourth electromagnetic directional control valve 12, the fifth electromagnetic directional control valve 13, and the sixth electromagnetic directional control valve 14 are respectively connected to the tipping cylinder group 2, the slewing cylinder group 3, the main vehicle outrigger cylinder group 4, the variable volume outrigger cylinder group 5, the extension cylinder group 6, and the lifting cylinder group 7 through hydraulic locks 18. After the tipping cylinder group 2, the slewing cylinder group 3, the main vehicle outrigger cylinder group 4, the variable volume outrigger cylinder group 5, the extension cylinder group 6, and the lifting cylinder group 7 complete their movements, the pistons of the tipping cylinder group 2, the slewing cylinder group 3, the main vehicle outrigger cylinder group 4, the variable volume outrigger cylinder group 5, the extension cylinder group 6, and the lifting cylinder group 7 can remain in their current positions without being supplied with oil, preventing the pistons from moving on their own under the action of external loads.

[0042] In this embodiment, the extension cylinder group 6 includes a first front cylinder 601, a second front cylinder 602, a first rear cylinder 603, and a second rear cylinder 604; the rodless cavity of the first front cylinder 601 is communicated with the rod cavity of the first rear cylinder 603, and the rodless cavity of the second front cylinder 602 is communicated with the rod cavity of the second rear cylinder 604.

[0043] Specifically, the rodless cavities of the first rear cylinder 603 and the second rear cylinder 604 are communicated with the second oil outlet 102, and the rod cavities of the second front cylinder 602 and the first front cylinder 601 are communicated with the fuel tank 8. When the second oil outlet 102 supplies oil to the rodless cavities of the first rear cylinder 603 and the second rear cylinder 604, the oil in the rod cavities of the first rear cylinder 603 and the second rear cylinder 604 flows into the rodless cavities of the first front cylinder 601 and the second front cylinder 602 as the pistons extend, ensuring that the pistons of the first front cylinder 601 and the second front cylinder 602 move synchronously, thereby ensuring that the volume strokes of the first rear cylinder 603 and the second rear cylinder 604 are equal to the volume strokes of the first front cylinder 601 and the second front cylinder 602, and further ensuring the synchronous operation of the rodless cavity of the first front cylinder 601 and the rodless cavities of the first rear cylinder 603 and the second front cylinder 602 and the second rear cylinder 604.

[0044] In this embodiment, the rod cavities of the first front cylinder 601 and the second front cylinder 602 are respectively connected to second electromagnetic valves 19 for controlling the on-off of the oil circuit, and the rod cavities of the first front cylinder 601 and the second front cylinder 602 are connected to the hydraulic lock 18 through the second electromagnetic valves 19. The second electromagnetic valve 19 is a normally closed two-position two-way electromagnetic valve, which can be opened when the extension cylinder group 6 needs to operate.

[0045] In this embodiment, the lifting cylinder group 7 includes a lifting front cylinder 701 and a lifting rear cylinder 702, and the lifting front cylinder 701 and the lifting rear cylinder 702 are connected in series.

[0046] In this embodiment, the rodless chambers of each oil cylinder in the rotary oil cylinder group 3, the main vehicle outrigger oil cylinder group 4, and the variable-volume outrigger oil cylinder group 5 are respectively connected to a third solenoid valve 20 for controlling the on / off of the oil circuit. The third solenoid valve 20 is a normally closed two-position two-way solenoid valve. This enables each oil cylinder in the rotary oil cylinder group 3, the main vehicle outrigger oil cylinder group 4, and the variable-volume outrigger oil cylinder group 5 to be individually operated. When the ground is uneven, each oil cylinder in the rotary oil cylinder group 3, the main vehicle outrigger oil cylinder group 4, and the variable-volume outrigger oil cylinder group 5 can be individually controlled, so that each rotary outrigger, main vehicle outrigger, and variable-volume outrigger can be stably supported on the ground.

[0047] In this embodiment, the first oil outlet 101 and the second oil outlet 102 are connected to the fuel tank 8 through a fourth solenoid valve 21 for controlling the on / off of the oil circuit. The fourth solenoid valve 21 is a normally open two-position two-way solenoid valve. During the operation of the entire system, the fourth solenoid valve 21 remains in the off state. In case of an emergency, the fourth solenoid valve 21 can be adjusted to the connected state, so that the double-pump 1 is directly connected to the fuel tank 8 for rapid unloading.

[0048] Embodiment 2

[0049] Refer to Figure 2 , which is Embodiment 2 of the hydraulic system of a variable-volume display vehicle according to the present invention. The difference between this embodiment and Embodiment 1 is that a first one-way throttle valve 22 for controlling the retraction speed of the piston of the lifted oil cylinder 702 is connected between the lifted oil cylinder 702 and the sixth electromagnetic directional control valve 14, so that the speed of the piston of the lifted oil cylinder 702 during retraction is controllable, preventing danger caused by too fast retraction speed.

[0050] Embodiment 3

[0051] Refer to Figure 3 , which is Embodiment 3 of the hydraulic system of a variable-volume display vehicle according to the present invention. The difference between this embodiment and Embodiment 2 is that a first one-way throttle valve 23 for controlling the retraction speed of the piston of the tilting oil cylinder group 2 is connected between the first electromagnetic directional control valve 9 and the tilting oil cylinder group 2. This makes the speed of the piston of each oil cylinder in the tilting oil cylinder group 2 during retraction controllable, preventing danger caused by too fast retraction speed.

[0052] Embodiment 4

[0053] Refer to Figure 4 and Figure 5, a display vehicle with any one of the hydraulic systems of Embodiments 1 to 3, including a vehicle body 24, on which a base carriage 25, a first variable-volume carriage 26 and a second variable-volume carriage 27 are provided. The first variable-volume carriage 26 and the second variable-volume carriage 27 are respectively movably nested inside and outside the base carriage 25. A variable-volume mechanism 28 for expanding the first variable-volume carriage 26 and the second variable-volume carriage 27 from inside and outside the base carriage 25 to the outside is provided on the base carriage 25; a display platform 29 is further provided below the first variable-volume carriage 26. A connecting plate 30 is provided on the display platform 29. A tilting oil cylinder group 2 is provided below the first variable-volume carriage 26. The output end of the tilting oil cylinder group 2 is connected to the connecting plate 30. The connecting plate 30 is hinged to the first variable-volume carriage 26 at a position between the tilting driving member and the display platform 29.

[0054] The first variable-volume carriage 26 is exhibited from the right side of the base carriage 25 and is embedded in the base carriage 25; the second variable-volume carriage 27 is exhibited from the left side of the base carriage 25 and is sleeved outside the base carriage 25. The variable-volume mechanism 28 moves the first variable-volume carriage 26 out of the base carriage 25 to the right, and the first-level expansion can be achieved. If the first-level expansion cannot meet the usage requirements, the variable-volume mechanism 28 can move the second variable-volume carriage 27 from the outside of the base carriage 25 to the left to achieve the second-level expansion; the output end of the tilting oil cylinder group 2 extends, causing the connecting plate 30 to rotate around the hinge position, and then driving the display platform 29 to rotate, so that the display platform 29 gradually rotates to a position parallel to the first variable-volume carriage 26, facilitating the user to display goods on the display platform 29; when the display platform 29 needs to be retracted, the output end of the tilting oil cylinder group 2 retracts, driving the connecting plate 30 to rotate again, causing the display platform 29 to rotate towards the first variable-volume carriage 26 until the display platform 29 is parallel to the first variable-volume carriage 26 or is retracted into the first variable-volume carriage 26, thereby achieving the effect of retracting the display platform 29.

[0055] In this embodiment, a fence 31 is provided on the display platform 29. Specifically, a fence 31 is fixedly provided on the periphery of the display platform 29 to prevent the user from falling off the display platform 29.

[0056] In this embodiment, the variable volume mechanism 28 includes a number of first front oil cylinders 601 and a number of first rear oil cylinders 603; the first rear oil cylinders 603 are installed at the bottom of the base carriage 25, and the first front oil cylinders 601 are installed below the first rear oil cylinders 603; the output end of the first front oil cylinder 601 is connected to the bottom of the first variable volume carriage 26, and the output end of the first rear oil cylinder 603 is connected to the bottom of the second variable volume carriage 27. When a first-level expansion is required, the first front oil cylinder 601 is started, and the output end of the first front oil cylinder 601 moves away from the base carriage 25, driving the first variable volume carriage 26 to move away from the base carriage 25, thereby achieving the first-level expansion; when a second-level expansion is required, the output end of the first rear oil cylinder 603 moves away from the base carriage 25, driving the second variable volume carriage 27 to move away from the base carriage 25, thereby achieving the second-level expansion.

[0057] In this embodiment, it further includes a variable volume outrigger oil cylinder group 5, and the variable volume outrigger oil cylinder group 5 is fixedly arranged at the bottom of the first variable volume carriage 26. When the second variable volume carriage 27 is extended to the set position, the piston of the variable volume outrigger oil cylinder group 5 extends away from the second variable volume carriage 27 until the piston abuts against the ground, achieving the effect of supporting the second variable volume carriage 27.

[0058] In this embodiment, it further includes a main vehicle outrigger oil cylinder group 4, and the main vehicle outrigger oil cylinder group 4 is fixedly arranged at the bottom of the base carriage 25. When the second variable volume carriage 27 or the first variable volume carriage 26 is extended to the set position, the piston of the main vehicle outrigger oil cylinder group 4 extends away from the base carriage 25 until the piston abuts against the ground, achieving the effect of supporting the base carriage 25.

[0059] In this embodiment, it further includes a rotary oil cylinder group 3, and the rotary oil cylinder group 3 is hinged to the bottom of the first variable volume carriage 26. When the first variable volume carriage 26 is extended from the base carriage 25, the piston of the rotary oil cylinder group 3 extends, and at the same time, the rotary oil cylinder group 3 rotates towards the ground direction. When the rotary oil cylinder group 3 is perpendicular to the ground, its piston abuts against the ground, achieving the effect of supporting the first variable volume carriage 26.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A hydraulic system for a variable-volume display vehicle, characterized in that, it includes a double-pump (1), a tipping cylinder group (2), a rotating cylinder group (3), a main vehicle outrigger cylinder group (4), a variable-volume outrigger cylinder group (5), an extension cylinder group (6), a lifting cylinder group (7), and a fuel tank (8); the double-pump (1) is provided with a first oil outlet (101) and a second oil outlet (102), the first oil outlet (101) is connected to the tipping cylinder group (2) through a first electromagnetic directional valve (9), and the first oil outlet (101) is connected to the rotating cylinder group (3) through a second electromagnetic directional valve (10); the second oil outlet (102) is connected to the main vehicle outrigger cylinder group (4) through a third electromagnetic directional valve (11), the second oil outlet (102) is connected to the variable-volume outrigger cylinder group (5) through a fourth electromagnetic directional valve (12), the second oil outlet (102) is connected to the extension cylinder group (6) through a fifth electromagnetic directional valve (13), and the second oil outlet (102) is connected to the lifting cylinder group (7) through a sixth electromagnetic directional valve (14); the tipping cylinder group (2), the rotating cylinder group (3), the main vehicle outrigger cylinder group (4), the variable-volume outrigger cylinder group (5), the extension cylinder group (6), and the lifting cylinder group (7) are connected to the fuel tank (8); the first oil outlet (101) is connected to the second oil outlet (102) through a first solenoid valve (15) for controlling the on / off of the oil circuit; the extension cylinder group (6) includes a first front cylinder (601), a second front cylinder (602), a first rear cylinder (603), and a second rear cylinder (604); the rodless cavity of the first front cylinder (601) is connected to the rod cavity of the first rear cylinder (603), and the rodless cavity of the second front cylinder (602) is connected to the rod cavity of the second rear cylinder (604); the rod cavities of the first front cylinder (601) and the second front cylinder (602) are respectively connected with second solenoid valves (19) for controlling the on / off of the oil circuit; the lifting cylinder group (7) includes a lifting front cylinder (701) and a lifting rear cylinder (702), the lifting front cylinder (701) and the lifting rear cylinder (702) are connected in series, and a first one-way throttle valve for controlling the piston retraction speed of the lifting rear cylinder (702) is connected between the lifting rear cylinder (702) and the sixth electromagnetic directional valve (14); the first oil outlet (101) and the second oil outlet (102) are connected to the fuel tank (8) through a fourth solenoid valve (21) for controlling the on / off of the oil circuit.

2. The hydraulic system for a variable-volume display vehicle according to claim 1, characterized in that, the first electromagnetic directional valve (9), the second electromagnetic directional valve (10), the third electromagnetic directional valve (11), the fourth electromagnetic directional valve (12), the fifth electromagnetic directional valve (13), and the sixth electromagnetic directional valve (14) are respectively connected to the tipping cylinder group (2), the rotating cylinder group (3), the main vehicle outrigger cylinder group (4), the variable-volume outrigger cylinder group (5), the extension cylinder group (6), and the lifting cylinder group (7) through hydraulic locks (18).

3. The hydraulic system of the variable - volume display vehicle according to any one of claims 1 - 2, characterized in that, the rodless cavities of each oil cylinder in the rotary oil cylinder group (3), the main vehicle outrigger oil cylinder group (4), and the variable - volume outrigger oil cylinder group (5) are respectively connected to a third solenoid valve (20) for controlling the on - off of the oil circuit.

4. The hydraulic system of the variable - volume display vehicle according to claim 3, characterized in that, a first one - way throttle valve (23) for controlling the piston retraction speed of the tipping oil cylinder group (2) is connected between the first electromagnetic directional control valve (9) and the tipping oil cylinder group (2).

5. A display vehicle having the hydraulic system according to any one of claims 1 - 4, characterized in that, it includes a vehicle body (24), a base carriage (25), a first variable - volume carriage (26) and a second variable - volume carriage (27) are provided on the vehicle body (24), the first variable - volume carriage (26) and the second variable - volume carriage (27) are respectively movably nested inside and outside the base carriage (25), and a variable - volume mechanism (28) for expanding the first variable - volume carriage (26) and the second variable - volume carriage (27) from inside and outside the base carriage (25) to the outside is provided on the base carriage (25).

6. The display vehicle according to claim 5, characterized in that, a display platform (29) is further provided below the first variable - volume carriage (26), a connecting plate (30) is provided on the display platform (29), a tipping oil cylinder group (2) is provided below the first variable - volume carriage (26), the output end of the tipping oil cylinder group (2) is connected to the connecting plate (30), and the connecting plate (30) is hinged to the first variable - volume carriage (26) at a position between the tipping driving member and the display platform (29).

7. The display vehicle according to claim 6, characterized in that, the variable - volume mechanism (28) includes a plurality of first front oil cylinders (601) and a plurality of first rear oil cylinders (603); the first rear oil cylinders (603) are installed at the bottom of the base carriage (25), the first front oil cylinders (601) are installed below the first rear oil cylinders (603); the output end of the first front oil cylinder (601) is connected to the bottom of the first variable - volume carriage (26), and the output end of the first rear oil cylinder (603) is connected to the bottom of the second variable - volume carriage (27).

8. The display vehicle according to claim 7, characterized in that, it further includes a variable - volume outrigger oil cylinder group (5), and the variable - volume outrigger oil cylinder group (5) is fixedly arranged at the bottom of the second variable - volume carriage (27).

9. The display vehicle according to claim 8, characterized in that, it further includes a main vehicle outrigger oil cylinder group (4), the main vehicle outrigger oil cylinder group (4) is fixedly arranged at the bottom of the base carriage (25); it further includes a rotary oil cylinder group (3), and the rotary oil cylinder group (3) is hinged to the bottom of the first variable - volume carriage (26).

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