Supercharging device, hydraulic system and engineering machinery equipment

Abstract

A supercharging device, a hydraulic system and an engineering machinery equipment; the supercharging device includes: a supercharging reversing valve, a back pressure mechanism connected to the supercharging reversing valve, a supercharging cylinder connected to the back pressure mechanism, and a confluence mechanism connected to the supercharging cylinder; the supercharging reversing valve is provided with a first oil inlet, a first working oil port and a second working oil port; the back pressure mechanism includes a first back pressure valve group communicating with the first working oil port and a second back pressure valve group communicating with the second working oil port; a first high-pressure rodless cavity, a first low-pressure rod chamber, a second low-pressure rod chamber and a second high-pressure rodless cavity are sequentially arranged in the supercharging cylinder; the confluence mechanism is respectively communicated with the first high-pressure rodless cavity and the second high-pressure rodless cavity. By outputting hydraulic oil from the first working oil port or the second working oil port, when the hydraulic oil enters the first low-pressure rod chamber or the second low-pressure rod chamber, the second high-pressure rodless cavity or the first high-pressure rodless cavity outputs high-pressure hydraulic oil through the confluence mechanism, thereby increasing the output load force.

Description

Technical Field

[0001] The present invention relates to engineering hydraulic technology, and particularly to a pressure boosting device, a hydraulic system and an engineering machinery equipment. Background Art

[0002] Due to characteristics such as large power-to-volume ratio, easy implementation of overload protection and flexible layout, hydraulic systems are widely used in the fields of construction machinery and die-casting equipment.

[0003] Summary of the Invention

[0004] Based on this, it is necessary to provide a pressure boosting device, a hydraulic system and an engineering machinery equipment that can increase the output load force while avoiding the need to use high-power power equipment.

[0005] A pressure boosting device includes: a pressure boosting reversing valve, a back pressure mechanism connected to the pressure boosting reversing valve, a pressure boosting cylinder connected to the back pressure mechanism, and a confluence mechanism connected to the pressure boosting cylinder; the pressure boosting reversing valve is provided with a first oil inlet, a first working oil port and a second working oil port; the back pressure mechanism includes a first back pressure valve group communicating with the first working oil port and a second back pressure valve group communicating with the second working oil port; the pressure boosting cylinder is sequentially provided with a first high-pressure rodless cavity, a first low-pressure rod cavity, a second low-pressure rod cavity and a second high-pressure rodless cavity; the output port of the first back pressure valve group is communicated to the first low-pressure rod cavity; the output port of the second back pressure valve group is communicated to the second low-pressure rod cavity; a first one-way valve is connected between the output port of the first back pressure valve group and the second high-pressure rodless cavity; a second one-way valve is connected between the output port of the second back pressure valve group and the first high-pressure rodless cavity; the confluence mechanism is respectively communicated to the first high-pressure rodless cavity and the second high-pressure rodless cavity.

[0006] In the above pressure boosting device, by outputting hydraulic oil from the first working oil port or the second working oil port, when the hydraulic oil enters the first low-pressure rod cavity or the second low-pressure rod cavity, since the piston acting areas of the first low-pressure rod cavity and the second low-pressure rod cavity are larger than the piston acting areas of the second high-pressure rodless cavity and the first high-pressure rodless cavity, the second high-pressure rodless cavity or the first high-pressure rodless cavity outputs high-pressure hydraulic oil through the confluence mechanism, thereby increasing the output load force. ​

[0007] In one embodiment, the booster cylinder includes a main cylinder body, a first side cylinder body connected to one end of the main cylinder body, a second side cylinder body connected to one end of the main cylinder body and a piston member; the piston member includes a main piston block arranged in the main cylinder body, a first secondary piston block arranged in the first side cylinder body and a second secondary piston block arranged in the second side cylinder body; the main piston block, the first secondary piston block and the second secondary piston block are linked together; the main cylinder body forms the first low-pressure rod chamber and the second low-pressure rod chamber under the separation of the main piston block; the first side cylinder body forms the first high-pressure rodless chamber and the first high-pressure rod chamber under the separation of the first secondary piston block; the second side cylinder body forms the second high-pressure rodless chamber and the second high-pressure rod chamber under the separation of the second secondary piston block; the output port of the first back-pressure valve group is also connected to the second high-pressure rod chamber; the output port of the second back-pressure valve group is connected to the first high-pressure rod chamber; thereby, the thrust on the piston member can be increased, and the output load force can be further increased.

[0008] In one embodiment, the first back-pressure valve assembly includes a third one-way valve and a first relief valve arranged in parallel, thereby preventing hydraulic oil from flowing back through the first back-pressure valve assembly when the first low-pressure rod chamber is compressed.

[0009] In one embodiment, the merging mechanism is provided with a first merging inlet connected to the second high-pressure rodless chamber; the merging mechanism is also provided with a second merging inlet connected to the first high-pressure rodless chamber; the merging mechanism is also provided with an outlet; the merging mechanism includes a first cartridge valve connected to the first merging inlet and a second cartridge valve connected to the second merging inlet; an output port of the first cartridge valve is connected to the outlet, and another output port of the first cartridge valve is connected to the control end of the second cartridge valve; an output port of the second cartridge valve is connected to the outlet, and another output port of the second cartridge valve is connected to the control end of the first cartridge valve; thereby avoiding a decrease in the output load force of the merging mechanism.

[0010] A hydraulic system includes a boosting device, a driving reversing valve connected to the boosting device, an actuator connected to the driving reversing valve, an oil inlet circuit connected to the first oil inlet, an oil pump for pumping hydraulic oil to the oil inlet circuit, and an oil outlet circuit connected to the driving reversing valve; the driving reversing valve is provided with a second oil inlet connected to the outlet of the merging mechanism; the driving reversing valve is also provided with a second oil return port connected to the oil outlet circuit; the driving reversing valve is also provided with a third working oil port connected to the first action chamber of the actuator; the driving reversing valve is also provided with a fourth working oil port connected to the second action chamber of the actuator; thereby enabling the actuator to move in different directions.

[0011] In one embodiment, the boost reversing valve is a three-position four-way valve; the neutral position function of the boost reversing valve is of the H type; thereby, the moving direction of the piston member in the boost cylinder can be switched, enabling the boost device to continuously output high-pressure hydraulic oil.

[0012] In one embodiment, it further includes a second relief valve connected between the oil inlet circuit and the oil outlet circuit and a fuel tank for storing hydraulic oil; the inlet and suction port of the oil pump extends into the fuel tank through a pipeline; one end of the oil outlet circuit extends into the fuel tank; thereby avoiding damage to the boost reversing valve due to excessive oil pressure of the oil pump.

[0013] In one embodiment, it further includes a hydraulic lock; the third working oil port of the drive reversing valve is connected to the first acting chamber of the actuator through the hydraulic lock; the oil outlet circuit is connected to the second acting chamber of the actuator through the hydraulic lock; thereby, after the oil pump stops outputting, it avoids the active reverse flow of the hydraulic oil in the first acting chamber or the second acting chamber, so as to maintain the telescopic length or angular state of the actuator.

[0014] An engineering construction machinery includes: a main carrier platform and at least one hydraulic system; the hydraulic system is installed on the main carrier platform.

[0015] In one embodiment, it further includes a telescopic mechanism connected to the main carrier platform, the telescopic mechanism is driven by the hydraulic system, in the hydraulic system for driving the telescopic mechanism, the actuator is a cylinder; and / or,

[0016] The engineering construction machinery further includes a swing mechanism connected to the main carrier platform, the swing mechanism is driven by the hydraulic system, in the hydraulic system for driving the swing mechanism, the actuator is a hydraulic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the hydraulic system according to an embodiment of the present invention;

[0018] Figure 2 is Figure 1 a schematic structural diagram of the boost device in

[0019] Figure 3 It is a schematic structural diagram of the engineering construction machinery according to an embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of the engineering construction machinery according to the second embodiment of the present invention.

[0021] The corresponding relationship between each reference numeral and its meaning in the drawings is as follows:

[0022] 100. Boosting device; 20. Boosting reversing valve; 30. Backpressure mechanism; 31. First backpressure valve group; 311. Third one-way valve; 312. First overflow valve; 32. Second backpressure valve group; 40. Boosting cylinder; 401. First high-pressure rodless cavity; 402. First low-pressure rod cavity; 403. Second low-pressure rod cavity; 404. Second high-pressure rodless cavity; 405. First high-pressure rod cavity; 406. Second high-pressure rod cavity; 41. First one-way valve; 42. Second one-way valve; 43. Main cylinder block; 44. First side cylinder block; 45. Second side cylinder block; 46. Piston part; 461. Main piston block; 462. First auxiliary piston block; 463. Second auxiliary piston block; 47. Connecting rod; 50. Confluence mechanism; 501. First confluence inlet; 502. Second confluence inlet; 503. Outlet; 51. First cartridge valve; 52. Second cartridge valve; 600. Hydraulic system; 61. Driving reversing valve; 62. Actuator; 621. First acting cavity; 622. Second acting cavity; 63. Inlet oil circuit; 64. Oil pump; 65. Outlet oil circuit; 66. Second overflow valve; 67. Oil tank; 68. Hydraulic lock; 700. Construction machinery equipment; 71. Main carrier platform; 72. Telescopic mechanism; 73. Swing mechanism. Detailed implementation manners

[0023] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] Please refer to Figures 1 to 4, is a boosting device 100 according to an embodiment of the present invention, which is used to increase the output hydraulic pressure. The boosting device 100 includes a boosting reversing valve 20, a back pressure mechanism 30 connected to the boosting reversing valve 20, a boosting cylinder 40 connected to the back pressure mechanism 30, and a merging mechanism 50 connected to the boosting cylinder 40; the boosting reversing valve 20 is provided with a first oil inlet, a first working oil port and a second working oil port; the back pressure mechanism 30 includes a first back pressure valve group 31 connected to the first working oil port and a second back pressure valve group 32 connected to the second working oil port; the boosting cylinder 40 is provided with a first high-pressure rodless chamber 401, a first low-pressure rod chamber 402, a second low-pressure chamber 403 and a second high-pressure chamber 404 in sequence. The rod chamber 403 and the second high-pressure rodless chamber 404; the output port of the first back-pressure valve group 31 is connected to the first low-pressure rod chamber 402; the output port of the second back-pressure valve group 32 is connected to the second low-pressure rod chamber 403; a first one-way valve 41 is connected between the output port of the first back-pressure valve group 31 and the second high-pressure rodless chamber 404; a second one-way valve 42 is connected between the output port of the second back-pressure valve group 32 and the first high-pressure rodless chamber 401; the merging mechanism 50 is respectively connected to the first high-pressure rodless chamber 401 and the second high-pressure rodless chamber 404.

[0026] Please refer to Figure 2. By outputting hydraulic oil from the first working oil port or the second working oil port, when the hydraulic oil enters the first low-pressure rod chamber 402 or the second low-pressure rod chamber 403, since the piston action area of the first low-pressure rod chamber 402 and the second low-pressure rod chamber 403 is larger than the piston action area of the second high-pressure rodless chamber 404 and the first high-pressure rodless chamber 401, the second high-pressure rodless chamber 404 or the first high-pressure rodless chamber 401 outputs high-pressure hydraulic oil through the merging mechanism 50, thereby increasing the output load force.

[0027] In one embodiment, the booster cylinder 40 includes a main cylinder body 43, a first side cylinder body 44 connected to one end of the main cylinder body 43, a second side cylinder body 45 connected to one end of the main cylinder body 43, and a piston member 46; the piston member 46 includes a main piston block 461 provided in the main cylinder body 43, a first secondary piston block 462 provided in the first side cylinder body 44, and a second secondary piston block 463 provided in the second side cylinder body 45; the main piston block 461, the first secondary piston block 462, and the second secondary piston block 463 are linked together; the main cylinder body 43 is connected to the main cylinder body 43. The first low-pressure rod chamber 402 and the second low-pressure rod chamber 403 are formed under the separation of the piston block 461; the first side cylinder body 44 is formed under the separation of the first secondary piston block 462 to form a first high-pressure rodless chamber 401 and a first high-pressure rod chamber 405; the second side cylinder body 45 is formed under the separation of the second secondary piston block 463 to form a second high-pressure rodless chamber 404 and a second high-pressure rod chamber 406; the output port of the first back-pressure valve group 31 is also connected to the second high-pressure rod chamber 406; the output port of the second back-pressure valve group 32 is connected to the first high-pressure rod chamber 405.

[0028] Specifically, the inner diameter of the main cylinder block 43 is larger than that of the first side cylinder block 44 or the second side cylinder block 45, and the side area of the main piston block 461 is larger than that of the first auxiliary piston block 462 or the second auxiliary piston block 463; the oil circuits of the first high-pressure rod chamber 405 and the first low-pressure rod chamber 402, or the second low-pressure rod chamber 403 and the second high-pressure rod chamber 406 are separated; in this embodiment, the main piston block 461, the first auxiliary piston block 462, and the second auxiliary piston block 463 are linked by a connecting rod 47; since hydraulic oil can be injected into the first low-pressure rod chamber 402 and the second high-pressure rod chamber 406 simultaneously, or into the second low-pressure rod chamber 403 and the first high-pressure rod chamber 405 simultaneously, the thrust on the piston member 46 can be increased, and the output load force can be further increased.

[0029] In one of the embodiments, the first back-pressure valve group 31 includes a third one-way valve 311 and a first overflow valve 312 arranged in parallel. Specifically, the structure of the second back-pressure valve group 32 is the same as that of the first back-pressure valve group 31, so as to prevent the hydraulic oil from flowing back through the first back-pressure valve group 31 or the second back-pressure valve group 32 when the first low-pressure rod chamber 402 or the second low-pressure rod chamber 403 is compressed, and to prevent the hydraulic pressure in the second high-pressure rodless chamber 404 from being too high through the action of the first overflow valve 312.

[0030] In one of the embodiments, the confluence mechanism 50 has a first confluence inlet 501 communicating with the second high-pressure rodless chamber 404; the confluence mechanism 50 also has a second confluence inlet 502 communicating with the first high-pressure rodless chamber 401; the confluence mechanism 50 also has an outlet 503; the confluence mechanism 50 includes a first cartridge valve 51 communicating with the first confluence inlet 501 and a second cartridge valve 52 communicating with the second confluence inlet 502; one output port of the first cartridge valve 51 communicates with the outlet 503, and the other output port of the first cartridge valve 51 communicates with the control end of the second cartridge valve 52; one output port of the second cartridge valve 52 communicates with the outlet 503, and the other output port of the second cartridge valve 52 communicates with the control end of the first cartridge valve 51.

[0031] When the hydraulic oil first enters from the first confluence inlet 501, one path of the hydraulic oil flowing out of the first cartridge valve 51 flows out of the confluence mechanism 50 through the outlet 503, and the other path of the hydraulic oil triggers the control end of the second cartridge valve 52, causing the inlet and outlet of the second cartridge valve 52 to be blocked, so as to prevent the hydraulic oil from flowing from the outlet 503 to the second cartridge valve 52.

[0032] When the hydraulic oil first enters from the second confluence inlet 502, one path of the hydraulic oil flowing out of the second cartridge valve 52 flows out of the confluence mechanism 50 from the outlet 503, and the other path of the hydraulic oil triggers the control end of the first cartridge valve 51, causing the inlet and outlet of the first cartridge valve 51 to be blocked, preventing the hydraulic oil from flowing from the outlet 503 to the first cartridge valve 51; in other embodiments, the confluence mechanism 50 can also be a shuttle valve.

[0033] Under the direction control of the boosting reversing valve 20, when the hydraulic oil flows out from the first working oil port, the hydraulic oil enters the first low-pressure rod chamber 402 from the first back-pressure valve group 31 respectively. Since the acting area in the first low-pressure rod chamber 402 is larger than the acting area in the second high-pressure rodless chamber, the hydraulic oil in the first low-pressure rod chamber 402 pushes the main piston block 461 to move towards the second high-pressure rodless chamber 404, and the second high-pressure rodless chamber 404 outputs high-pressure oil. The first one-way valve 41 restricts the reverse flow of the hydraulic oil in the second high-pressure rodless chamber 404.

[0034] When the main piston block 461 moves towards the second high-pressure rodless chamber 404 to the limit position, by switching the boosting reversing valve 20, the hydraulic oil flows out from the second working oil port, and the hydraulic oil enters the second low-pressure rod chamber 403 from the second back-pressure valve group 32 respectively. Since the acting area in the second low-pressure rod chamber 403 is larger than the acting area in the first high-pressure rodless chamber, the hydraulic oil in the second low-pressure rod chamber 403 pushes the main piston block 461 to move towards the first high-pressure rodless chamber 401, and the first high-pressure rodless chamber 401 outputs high-pressure oil. The second one-way valve 42 restricts the reverse flow of the hydraulic oil in the first high-pressure rodless chamber 401. The confluence mechanism 50 selects the source of the high-pressure oil output from the first high-pressure rodless chamber 401 and the second high-pressure rodless chamber 404, and by switching between the first working oil port and the second working oil port, the boosting device 100 maintains a relatively high output load force.

[0035] Please refer to Figure 1 , the present invention also provides a hydraulic system 600, including: a boosting device 100, a driving reversing valve 61 connected to the boosting device 100, an actuator 62 connected to the driving reversing valve 61, an oil inlet pipeline 63 communicating with the first oil inlet, an oil pump 64 pumping hydraulic oil to the oil inlet pipeline 63, and an oil outlet pipeline 65 connected to the driving reversing valve 61; the driving reversing valve 61 is provided with a second oil inlet communicating with the outlet 503 of the confluence mechanism 50; the driving reversing valve 61 is further provided with a second oil return port communicating with the oil outlet pipeline 65; the driving reversing valve 61 is further provided with a third working oil port communicating with the first acting chamber 621 of the actuator 62; the driving reversing valve 61 is further provided with a fourth working oil port communicating with the second acting chamber 622 of the actuator 62.

[0036] Specifically, after the oil pump 64 pumps hydraulic oil to the boosting device 100, through the adjustment of the boosting device 100, the load force output by the confluence mechanism 50 is higher than the load of the oil pump 64; the driving reversing valve 61 has two working states. In the first working state, the second oil inlet is communicated with the third working oil port, and the second oil return port is communicated with the fourth working oil port; in the second working state, the second oil inlet is communicated with the fourth working oil port, and the second oil return port is communicated with the third working oil port, so as to enable the actuator 62 to move in different directions.

[0037] In one of the embodiments, the boosting reversing valve 20 is a three-position four-way valve; the neutral position function of the boosting reversing valve 20 is of the H type; specifically, the boosting reversing valve 20 has three working states. In the first working state of the boosting reversing valve 20, the first oil inlet of the boosting reversing valve 20 is communicated with the first working oil port, and the first oil return port of the boosting reversing valve 20 is communicated with the second working oil port; in the second working state of the boosting reversing valve 20, the first oil inlet of the boosting reversing valve 20 is communicated with the second working oil port, and the first oil return port of the boosting reversing valve 20 is communicated with the first working oil port; in the third working state of the boosting reversing valve 20, the first oil inlet, the first working oil port, the first oil return port and the second working oil port of the boosting reversing valve 20 are mutually communicated, so as to switch the moving direction of the piston member 46 in the boosting cylinder 40 and maintain the output of the boosting device 100.

[0038] In one of the embodiments, the hydraulic system 600 further includes a second relief valve 66 connected between the oil inlet oil circuit 63 and the oil outlet oil circuit 65 and a fuel tank 67 for storing hydraulic oil; the suction port of the oil pump 64 extends into the fuel tank 67 through a pipeline; one end of the oil outlet oil circuit 65 extends into the fuel tank 67; specifically, the second relief valve 66 prevents the boosting reversing valve 20 from being damaged due to excessive oil pressure of the oil pump 64, and the hydraulic oil stored in the fuel tank 67 enables the oil pump 64 to continuously suck hydraulic oil and avoid interruption.

[0039] In one of the embodiments, the hydraulic system 600 further includes a hydraulic lock 68; the third working oil port of the driving reversing valve 61 is connected to the first acting chamber 621 of the actuator 62 through the hydraulic lock 68; the oil outlet oil circuit 65 is connected to the second acting chamber 622 of the actuator 62 through the hydraulic lock 68; thus, after the oil pump 64 stops outputting, it prevents the hydraulic oil in the first acting chamber 621 or the second acting chamber 622 from flowing back actively, so as to maintain the telescopic length or angular state of the actuator 62.

[0040] Please refer to Figure 3 and Figure 4 , the present invention further provides a construction engineering machinery �00, including: a main carrier 71 and at least one hydraulic system 600; the hydraulic system 600 is installed on the main carrier 71.

[0041] In one embodiment, the construction machinery equipment 700 further includes a telescopic mechanism 72 connected to the main carrier 71. The telescopic mechanism 72 is driven by a hydraulic system 600a. In the hydraulic system 600a that drives the telescopic mechanism 72, the actuator 62 is a hydraulic cylinder.

[0042] In one embodiment, the construction machinery equipment 700 further includes a swing mechanism 73 connected to the main carrier 71. The swing mechanism 73 is driven by a hydraulic system 600b. In the hydraulic system 600b that drives the swing mechanism 73, the actuator 62 is a hydraulic motor.

[0043] Specifically, the construction machinery equipment 700 can be a crane or a vehicle-mounted antenna.

[0044] In this embodiment, by outputting hydraulic oil from the first working oil port or the second working oil port, when the hydraulic oil enters the first low-pressure rod chamber or the second low-pressure rod chamber, since the piston acting areas of the first low-pressure rod chamber and the second low-pressure rod chamber are larger than the piston acting areas of the second high-pressure rodless chamber and the first high-pressure rodless chamber, the second high-pressure rodless chamber or the first high-pressure rodless chamber outputs high-pressure hydraulic oil through the confluence mechanism, thereby increasing the output load force.

[0045] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0046] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A boosting device, characterized in that: include: A boost reversing valve, a back pressure mechanism connected to the boost reversing valve, a boost cylinder connected to the back pressure mechanism and a merging mechanism connected to the boost cylinder; the boost reversing valve is provided with a first oil inlet, a first working oil port and a second working oil port; the back pressure mechanism includes a first back pressure valve group connected to the first working oil port and a second back pressure valve group connected to the second working oil port; a first high-pressure rodless chamber, a first low-pressure rod chamber, a second low-pressure rod chamber and a second high-pressure rodless chamber are sequentially provided in the boost cylinder; the output port of the first back pressure valve group is connected to the first low-pressure rod chamber; the output port of the second back pressure valve group is connected to the second low-pressure rod chamber; a first one-way valve is connected between the output port of the first back pressure valve group and the second high-pressure rodless chamber; a second one-way valve is connected between the output port of the second back pressure valve group and the first high-pressure rodless chamber; The first back-pressure valve group includes a third one-way valve and a first relief valve arranged in parallel; The second back-pressure valve group includes a fourth one-way valve and a third relief valve arranged in parallel; The merging mechanism is provided with a first merging inlet connected to the second high-pressure rodless chamber; the merging mechanism is also provided with a second merging inlet connected to the first high-pressure rodless chamber; the merging mechanism is also provided with an outlet; the merging mechanism includes a first cartridge valve connected to the first merging inlet and a second cartridge valve connected to the second merging inlet; an output port of the first cartridge valve is connected to the outlet, and another output port of the first cartridge valve is connected to the control end of the second cartridge valve; an output port of the second cartridge valve is connected to the outlet, and another output port of the second cartridge valve is connected to the control end of the first cartridge valve.

2. The boosting device according to claim 1, characterized in that: The booster cylinder includes a main cylinder body, a first side cylinder body connected to one end of the main cylinder body, a second side cylinder body connected to one end of the main cylinder body and a piston member; the piston member includes a main piston block arranged in the main cylinder body, a first secondary piston block arranged in the first side cylinder body and a second secondary piston block arranged in the second side cylinder body; the main piston block, the first secondary piston block and the second secondary piston block are linked together; the main cylinder body forms the first low-pressure rod chamber and the second low-pressure rod chamber under the separation of the main piston block; the first side cylinder body forms the first high-pressure rodless chamber and the first high-pressure rod chamber under the separation of the first secondary piston block; the second side cylinder body forms the second high-pressure rodless chamber and the second high-pressure rod chamber under the separation of the second secondary piston block; the output port of the first back-pressure valve group is also connected to the second high-pressure rod chamber; the output port of the second back-pressure valve group is connected to the first high-pressure rod chamber.

3. A hydraulic system, characterized in that: It comprises a boosting device as described in any one of claims 1 to 2, a driving reversing valve connected to the boosting device, an actuator connected to the driving reversing valve, an oil inlet circuit connected to the first oil inlet, an oil pump for pumping hydraulic oil to the oil inlet circuit, and an oil outlet circuit connected to the driving reversing valve; the driving reversing valve is provided with a second oil inlet connected to the outlet of the merging mechanism; the driving reversing valve is also provided with a second oil return port connected to the oil outlet circuit; the driving reversing valve is also provided with a third working oil port connected to the first working chamber of the actuator; the driving reversing valve is also provided with a fourth working oil port connected to the second working chamber of the actuator.

4. The hydraulic system according to claim 3, characterized in that The boost reversing valve is a three-position four-way valve; the middle position function of the boost reversing valve is H type.

5. The hydraulic system according to claim 3, characterized in that: It also includes a second overflow valve connected between the oil inlet circuit and the oil outlet circuit and an oil tank for storing hydraulic oil; the suction port of the oil pump extends to the oil tank through a pipeline; and one end of the oil outlet circuit extends to the oil tank.

6. The hydraulic system according to claim 3, characterized in that It also includes a hydraulic lock; the third working oil port of the driving reversing valve is connected to the first working chamber of the actuator through the hydraulic lock; the oil outlet passage is connected to the second working chamber of the actuator through the hydraulic lock.

7. An engineering machinery equipment, characterized in that: include: A main platform and at least one hydraulic system as claimed in claim 3; the hydraulic system is installed on the main platform.

8. The engineering machinery equipment according to claim 7, characterized in that: It also includes a telescopic mechanism connected to the main platform, the telescopic mechanism is driven by the hydraulic system, and in the hydraulic system driving the telescopic mechanism, the actuator is a cylinder; and / or, The engineering machinery equipment further includes a swing mechanism connected to the main platform, the swing mechanism is driven by the hydraulic system, and in the hydraulic system driving the swing mechanism, the actuator is an oil motor.

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