Energy recovery variable amplitude hydraulic system of pile driving barge

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to an energy recovery variable amplitude hydraulic system of a pile driving barge. An energy recovery variable amplitude hydraulic system of a pile driving barge comprises a driving cylinder which comprises a first cavity, a second cavity and a third cavity which are separated, a pressure medium is loaded to the first cavity and the third cavity to enable the driving cylinder to stretch out, the pressure medium is loaded to the second cavity to enable the driving cylinder to retract, and the action area of the first cavity is equal to that of the second cavity; the driving unit comprises a closed pump, the closed pump drives a pressure medium to be loaded to the first cavity or the second cavity, and under the action of potential energy, the second cavity discharges the pressure medium to drive the driving unit to move so as to store energy; the energy storage unit provides a pressure medium and loads the pressure medium to the third cavity, and under the action of potential energy, the third cavity discharges the pressure medium to enable the energy storage unit to store energy; and the oil supplementing unit is used for supplementing oil to the driving cylinder. The technical problems of energy waste of an open system and oil supplement and heat dissipation caused by unequal working areas of oil cylinders of a closed system in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a piling ship technical field, especially in a kind of energy recovery amplitude hydraulic system of piling ship. BACKGROUND

[0002] Coastal area water project is increasing, wherein, piling ship is a kind of offshore piling equipment, through piling ship, pile is installed in the soil layer of seabed, and after pile installation is completed, wind power generation platform can be installed on pile. The piling structure of piling ship mainly includes pile rack, piling hammer, guide frame, lifting hook and other structures. As shown in the drawing, the pile rack 1' of piling ship needs to be pitched, and its main working process is that pile is fixed on the pile rack 1', when oil cylinder 2' is stretched out, the pile rack 1' is erected with pile, and the process is called vertical rack;When pile angle is positioned and piling hammer is driven into seabed, oil cylinder 2' is retracted, and the pile rack is lowered, and the process is called falling rack. Figures 1-3

[0003] At present, the pitch hydraulic system of piling ship mostly adopts open system, and when vertical rack, hydraulic energy is converted into the gravitational potential energy of pile rack and pile, but when falling rack, the throttling mode of balance valve is used to overcome the negative work of gravitational potential energy of pile rack, and this mode has a large amount of energy loss, and the heat generated is also a damage to hydraulic element, reducing the reliability of hydraulic system.

[0004] In addition, the pitch system of some piling ships also adopts closed system, and the falling and vertical rack functions are realized by changing the swing angle of closed pump, and part of energy loss can be reduced. However, the closed system adopts non-equal-area oil cylinder, and a large-flow oil supplement pump needs to be set to supplement oil when vertical rack, and overflow valve needs to be set to discharge excess oil in closed system when falling rack.

[0005] Therefore, how to solve the problems of energy waste of open system and oil supplement and heat dissipation caused by non-equal-area oil cylinder of closed system is a technical problem faced by the field. UTILITY MODEL CONTENTS

[0006] In order to solve the technical problems of energy waste of open system and oil supplement and heat dissipation caused by non-equal-area oil cylinder of closed system in the prior art, the utility model provides an energy recovery amplitude hydraulic system of piling ship, which solves the above technical problems.

[0007] In order to solve the above technical problems, the utility model provides an energy recovery amplitude hydraulic system of piling ship, which comprises:

[0008] ​The driving cylinder comprises a first chamber, a second chamber and a third chamber, pressure medium is loaded to the first chamber and the third chamber to extend the driving cylinder, pressure medium is loaded to the second chamber to retract the driving cylinder, the acting areas of the first chamber and the second chamber are equal;

[0009] The driving unit comprises a closed pump, the closed pump drives pressure medium to be loaded to the first chamber or the second chamber, and the second chamber discharges pressure medium under the action of potential energy to drive the driving unit to store energy;

[0010] The energy storage unit provides pressure medium to be loaded to the third chamber, and the third chamber discharges pressure medium under the action of potential energy to store energy of the energy storage unit;

[0011] The oil supplementing unit supplements oil for the driving cylinder.

[0012] According to one embodiment of the utility model, the driving cylinder comprises a cylinder body and a piston element, the inner bottom surface of the cylinder body is formed with a hollow pipe in communication with the outside, the piston element is of a hollow structure, the piston element moves along the inner wall of the cylinder body and the hollow pipe, the first chamber is formed in the piston element, and the second chamber and the third chamber are separated in the cylinder body by the piston element.

[0013] According to one embodiment of the utility model, the energy storage unit comprises an energy accumulator, a gas cylinder group and an air compressor, the energy accumulator comprises a liquid chamber and a gas chamber separated by a piston, the liquid chamber is in communication with the third chamber, the gas chamber is in communication with the gas cylinder group, the air compressor pre-charges gas for the gas cylinder group, and a on-off valve for controlling on-off is arranged between the liquid chamber and the third chamber and between the gas chamber and the gas cylinder group.

[0014] According to one embodiment of the utility model, a one-way valve is arranged between the air compressor and the gas cylinder group, and the gas cylinder group is further provided with an exhaust valve.

[0015] According to one embodiment of the utility model, the oil supplementing unit comprises an oil supplementing pump and an oil supplementing valve, the pump outlet of the oil supplementing pump is in communication with the first chamber and the second chamber, and the oil supplementing pump supplements oil for the third chamber under the control of the oil supplementing valve.

[0016] According to one embodiment of the utility model, the oil supplementing unit and the energy storage unit do not simultaneously communicate with the third chamber.

[0017] According to one embodiment of the utility model, the driving unit further comprises a pilot pump, the closed pump is driven by a motor, the closed pump and the pilot pump are coaxially connected, and the pilot pump provides pilot pressure medium to a variable mechanism to adjust the displacement of the closed pump.

[0018] According to one embodiment of the utility model, the closed pump provides pressure medium for the drive cylinder under the control of the control valve group.

[0019] According to one embodiment of the utility model, two oil ports of the closed pump are communicated with the first cavity and the second cavity through two oil paths respectively, the control valve group comprises two hydraulic control valves and two control valves, the two hydraulic control valves are respectively located on the two oil paths to control the on-off of the oil path, the hydraulic control valve has a hydraulic control cavity, the two control valves respectively control the pressure medium or oil return of the corresponding first cavity or second cavity introduced by the two hydraulic control cavities, and the two control valves are reversed under the action of pilot oil provided by the pilot pump.

[0020] According to one embodiment of the utility model, the two control valves introduce pilot oil simultaneously under the control of the on-off valve, and the two control valves control the two hydraulic control cavities to simultaneously access the pressure medium or simultaneously return oil of the corresponding first cavity or second cavity.

[0021] Based on the above technical scheme, the utility model can realize the following technical effects:

[0022] The energy recovery variable-amplitude hydraulic system of the piling ship adopts a closed pump for the driving unit, the closed pump can load pressure medium for the driving cylinder, when the frame is lowered, the driving cylinder can also discharge pressure medium to drive the closed pump to move for energy storage, so that the energy is recovered; when the frame is erected, the accumulator of the energy storage unit can provide pressure medium to be loaded into the third cavity, so as to provide auxiliary thrust for the driving cylinder; when the frame is lowered, the pressure medium in the third cavity is discharged to the accumulator to be converted into the pressure potential energy of gas, so that the energy is recovered; the driving cylinder adopts a three-cavity oil cylinder, the acting area of the first cavity is equal to the acting area of the second cavity, so that the two oil ports of the closed pump are communicated with the first cavity and the second cavity respectively, when the driving cylinder acts, the pressure medium entering the first cavity is equal to the pressure medium discharged from the second cavity, so that the driving cylinder only needs to use a small oil supplement pump to supplement the hydraulic oil lost due to leakage in the driving cylinder, and at the same time, when the frame is lowered, an overflow valve is not needed to be arranged to discharge the excess oil in the closed system, so that the problems of energy waste of the existing system and the unequal size of the cavities of the oil cylinder in the closed system are solved.

[0023] The energy recovery variable-amplitude hydraulic system of the piling ship sets the specific structure of the driving cylinder, so that when the pressure medium is loaded into the first cavity and the third cavity, the driving cylinder can be extended, when the pressure medium is loaded into the second cavity, the driving cylinder is retracted, the acting area of the first cavity is equal to the acting area of the second cavity, and the pressure medium entering the driving cylinder of the closed system is equal to the pressure medium discharged from the driving cylinder.

[0024] The energy recovery variable-amplitude hydraulic system of the pile driving barge, the structure of the energy storage unit is specifically set, the air compressor can inflate the gas cylinder group, the gas cylinder group is communicated with the gas cavity of the energy accumulator, the liquid cavity of the energy accumulator can be communicated with the third cavity, when the pile frame is erected, the pressure of the gas cylinder is large, the piston of the energy accumulator pushes the pressure medium of the liquid cavity into the third cavity to assist the driving cylinder to extend, the pressure potential energy of the gas is converted into the pressure potential energy of the pressure medium, the release of the energy storage of the gas cylinder group is realized, when the pile frame is lowered, the driving cylinder is retracted, the pressure medium of the third cavity is discharged to the liquid cavity of the energy accumulator, the piston is pushed to move in the direction of the gas cavity, the gas is compressed, the gravitational potential energy of the pile frame is converted into the pressure potential energy of the gas and is stored in the gas cylinder, the energy recovery is realized, that is, when the pile frame is erected, the energy storage of the gas cylinder group is released, when the pile frame is lowered, the energy of the gas cylinder group is stored, and the cycle is repeated; the one-way valve is arranged between the air compressor and the gas cylinder group, only the air compressor is allowed to inflate the gas cylinder group, and the gas cannot move reversely; the gas cylinder group is provided with an exhaust valve, the gas in the gas cylinder group can be discharged, and danger caused by long-time non-use is avoided;

[0025] The energy recovery variable-amplitude hydraulic system of the pile driving barge, the structure of the energy storage unit is specifically set, the air compressor can inflate the gas cylinder group, the gas cylinder group is communicated with the gas cavity of the energy accumulator, the liquid cavity of the energy accumulator can be communicated with the third cavity, when the pile frame is erected, the pressure of the gas cylinder is large, the piston of the energy accumulator pushes the pressure medium of the liquid cavity into the third cavity to assist the driving cylinder to extend, the pressure potential energy of the gas is converted into the pressure potential energy of the pressure medium, the release of the energy storage of the gas cylinder group is realized, when the pile frame is lowered, the driving cylinder is retracted, the pressure medium of the third cavity is discharged to the liquid cavity of the energy accumulator, the piston is pushed to move in the direction of the gas cavity, the gas is compressed, the gravitational potential energy of the pile frame is converted into the pressure potential energy of the gas and is stored in the gas cylinder, the energy recovery is realized, that is, when the pile frame is erected, the energy storage of the gas cylinder group is released, when the pile frame is lowered, the energy of the gas cylinder group is stored, and the cycle is repeated; the one-way valve is arranged between the air compressor and the gas cylinder group, only the air compressor is allowed to inflate the gas cylinder group, and the gas cannot move reversely; the gas cylinder group is provided with an exhaust valve, the gas in the gas cylinder group can be discharged, and danger caused by long-time non-use is avoided;

[0026] The energy recovery variable-amplitude hydraulic system of the pile driving barge, the structure of the energy storage unit is specifically set, the air compressor can inflate the gas cylinder group, the gas cylinder group is communicated with the gas cavity of the energy accumulator, the liquid cavity of the energy accumulator can be communicated with the third cavity, when the pile frame is erected, the pressure of the gas cylinder is large, the piston of the energy accumulator pushes the pressure medium of the liquid cavity into the third cavity to assist the driving cylinder to extend, the pressure potential energy of the gas is converted into the pressure potential energy of the pressure medium, the release of the energy storage of the gas cylinder group is realized, when the pile frame is lowered, the driving cylinder is retracted, the pressure medium of the third cavity is discharged to the liquid cavity of the energy accumulator, the piston is pushed to move in the direction of the gas cavity, the gas is compressed, the gravitational potential energy of the pile frame is converted into the pressure potential energy of the gas and is stored in the gas cylinder, the energy recovery is realized, that is, when the pile frame is erected, the energy storage of the gas cylinder group is released, when the pile frame is lowered, the energy of the gas cylinder group is stored, and the cycle is repeated; the one-way valve is arranged between the air compressor and the gas cylinder group, only the air compressor is allowed to inflate the gas cylinder group, and the gas cannot move reversely; the gas cylinder group is provided with an exhaust valve, the gas in the gas cylinder group can be discharged, and danger caused by long-time non-use is avoided; BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is an initial state schematic view of the pile frame of the pile driving barge;

[0028] Figure 2 It is a state schematic view of the pile frame under the action of the oil cylinder;

[0029] Figure 3 It is a state schematic view of the pile frame after the pile frame is lowered;

[0030] Figure 4 It is a hydraulic principle view of the energy recovery variable-amplitude hydraulic system of the pile driving barge;

[0031] Figure 5Structure diagram of driving cylinder;

[0032] Figure 6 Hydraulic principle diagram of driving unit;

[0033] Figure 7 Hydraulic principle diagram of energy storage unit;

[0034] Figure 8 Hydraulic principle diagram of oil supplement unit;

[0035] Figure 9 Hydraulic principle diagram of control valve group;

[0036] In the figure: 1-driving cylinder; 11-first cavity; 12-second cavity; 13-third cavity; 14-cylinder body; 15-piston element; 16-hollow pipe; 2-driving unit; 21-closed pump; 22-pilot pump; 23-motor; 24-variable mechanism; 25-proportional valve; 261-first overflow valve; 262-second overflow valve; 263-third overflow valve; 264-fourth overflow valve; 27-filter; 281-first check valve; 282-second check valve; 3-energy storage unit; 31-energy accumulator; 311-liquid cavity; 312-gas cavity; 313-piston; 32-gas cylinder group; 321-gas cylinder; 322-safety valve; 323-solenoid valve; 33-air compressor; 341-first on-off valve; 342-second on-off valve; 35-check valve; 36-exhaust valve; 4-oil supplement unit; 41-oil supplement pump; 42-oil supplement valve; 43-driving motor; 44-fifth overflow valve; 45-third check valve; 5-control valve group; 511-first hydraulic control valve; 512-second hydraulic control valve; 521-first control valve; 522-second control valve; 53-switching valve; 541-sixth overflow valve; 542-seventh overflow valve; 6-oil tank; 1'-pile frame; 2'-oil cylinder. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0039] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments are not intended to limit the scope of the present application unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportion relationship for the convenience of description. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but should be considered as part of the specification under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not needed in subsequent drawings once an item is defined in one drawing.

[0040] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0041] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0042] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0043] like Figure 4 As shown in the figure, this embodiment proposes an energy recovery variable-amplitude hydraulic system for a piling vessel, including a drive cylinder 1, a drive unit 2, an energy storage unit 3, and an oil replenishment unit 4. The drive cylinder 1 extends to drive the pile frame to erect the pile, and retracts to lower the pile. The drive unit 2 provides a pressure medium to the drive cylinder 1, driving the drive cylinder 1 to perform telescopic movements. The energy storage unit 3 provides a pressure medium to the drive cylinder 1. During pile erection, the energy storage unit 3 provides a pressure medium to the drive cylinder 1 to provide auxiliary thrust. During lowering, under the action of gravitational potential energy, the pressure medium of the drive cylinder 1 is discharged to the energy storage unit 3, which can realize energy recovery. The oil replenishment unit 4 replenishes oil to the drive cylinder 1 to avoid vacuum phenomena.

[0044] like Figure 5 As shown, the drive cylinder 1 adopts a three-chamber hydraulic cylinder structure, with three chambers formed inside: a first chamber 11, a second chamber 12, and a third chamber 13. Applying a pressure medium to the first chamber 11 and the third chamber 13 causes the drive cylinder 1 to extend, while applying a pressure medium to the second chamber 12 causes the drive cylinder 1 to retract. Specifically, the drive cylinder 1 includes a cylinder body 14 and a piston element 15. A hollow tube 16 communicating with the outside is formed on the inner bottom surface of the cylinder body 14. The piston element 15 has a hollow structure and moves along the inner wall of the cylinder body 14 and the hollow tube 16. One end of the hollow tube 16 communicates with the outside of the drive cylinder 1, and the other end communicates with the inside of the piston element 15. The first chamber 11 is formed inside the piston element 15, which separates the second chamber 12 and the third chamber 13 within the cylinder body 14.

[0045] In a preferred embodiment, the effective area of ​​the first cavity 11 and the effective area of ​​the second cavity 12 are equal. Figure 5 As shown, the inner diameter of the cylinder body 14 of the drive cylinder 1 is D1, the piston element 15 includes a piston portion and a rod-shaped portion, the outer diameter of the rod-shaped portion of the piston element 15 is D2, and the outer diameter of the hollow tube 16 is D3. Thus, the effective area of ​​the first chamber 11 is... The effective area of ​​the second cavity 12 is ,but From this, we can deduce that: Therefore, when the drive cylinder 1 actuates, the amount of pressure medium entering the first chamber 11 or the second chamber 12 is equal to the amount of pressure medium discharged from the second chamber 12 or the first chamber 11. For example, when the drive cylinder 1 extends, the pressure medium enters the first chamber 11, and the volume of the entering pressure medium is V1. The pressure medium is discharged from the second chamber 12, and the volume of the discharged pressure medium is V2. Since the effective area of ​​the first chamber 11 is equal to the effective area of ​​the second chamber 12, V1 = V2.

[0046] Drive unit 2 is used to load pressure medium onto drive cylinder 1, such as... Figure 6 As shown, the drive unit 2 includes a closed-loop pump 21 with two ports, PA and PB. Port PA is connected to the first chamber 11 via an oil passage, and port PB is connected to the second chamber 12 via an oil passage. The drive pump 21 is driven by a motor 23. During erection, the motor 23 drives the drive pump 21, with port PA loading the first chamber 11 with pressure medium, and the pressure medium from the second chamber 12 flowing out to port PB, forming a closed system. During lowering, under the influence of gravitational potential energy, the pressure medium from the first chamber 11 is discharged, oil enters through port PA, and oil exits through port PB, driving the closed-loop pump 21 to rotate in the opposite direction, which in turn drives the motor 23 to rotate, realizing the conversion of mechanical energy into electrical energy stored in the power system. The motor 23 can be, but is not limited to, a servo motor.

[0047] As a preferred technical solution of the embodiment, in order to ensure that the pressure of the closed system is not too high, the oil port PA and the oil port PB are provided with a first overflow valve 261 and a second overflow valve 262, the first overflow valve 261 and the second overflow valve 262 are arranged in parallel and reversely assembled, when the pressure of the oil port PA is too high, the pressure medium can be discharged to the oil port PB through the first overflow valve 261; when the pressure of the oil port PB is too high, the pressure medium can be discharged to the oil port PA through the second overflow valve 262. In addition, the oil port PA is also connected with a third overflow valve 263, when the pressure of the oil port PA is too high, the pressure medium can also be discharged to the oil tank 6 through the third overflow valve 263; the oil port PB is also connected with a fourth overflow valve 264, when the pressure of the oil port PB is too high, the pressure medium can also be discharged to the oil tank 6 through the fourth overflow valve 264. Specifically, the pressure setting values of the first overflow valve 261 and the second overflow valve 262 can be the same, the pressure setting values of the third overflow valve 263 and the fourth overflow valve 264 can be the same, and the pressure setting values of the third overflow valve 263 and the fourth overflow valve 264 are slightly higher than the pressure setting values of the first overflow valve 261 and the second overflow valve 262, so that even if the first overflow valve 261 and the second overflow valve 262 fail, the third overflow valve 263 and the fourth overflow valve 264 can still protect the closed pump from being damaged due to too high pressure.

[0048] The driving unit 2 further comprises a pilot pump 22, which can be used to provide pilot pressure medium. The pilot pump 22 can be coaxially connected with the closed pump 21, and the pilot pump 22 can pump out pilot pressure medium to the variable mechanism 24, control the state of the variable mechanism 24, and then adjust the displacement of the closed pump 21.

[0049] As a preferred technical solution of the embodiment, the closed pump 21 can be a plunger pump, and after the pilot pressure medium enters the variable mechanism 24, the angle of the swash plate can be controlled, and then the displacement is controlled.

[0050] As a preferred technical solution of the embodiment, in order to ensure the cleanliness of the pilot pressure medium, a filter 27 is connected to the pump outlet of the pilot pump 22. In order to ensure the one-way flow of the pilot pressure medium, a first one-way valve 281 is further arranged between the pump outlet of the pilot pump 22 and the variable mechanism 24, so as to prevent the pilot pressure medium from flowing in reverse and damaging the pilot pump 22.

[0051] As a preferred technical solution of the embodiment, in order to control the pilot pressure medium to enter the variable mechanism 24, a proportional valve 25 is arranged between the pump outlet of the pilot pump 22 and the variable mechanism 24.

[0052] The energy storage unit 3 communicates with the third cavity 13, and when the vertical frame is erected, the energy storage unit 3 can provide pressure medium to load the third cavity 13, and play a role in auxiliary support; when the frame is lowered, the pressure medium discharged from the third cavity 13 enters the energy storage unit 3 to realize energy storage under the action of potential energy. Figure 7As shown, the energy storage unit 3 includes an energy accumulator 31, a gas cylinder group 32 and an air compressor 33, the energy accumulator 31 includes a liquid cavity 311 and a gas cavity 312 separated by a piston 313, the liquid cavity 311 is communicated with the third cavity 13, the gas cavity 312 is communicated with the gas cylinder group 32, and the air compressor 33 pre-charges the gas cylinder group 32 with gas.

[0053] As a preferred technical solution of the embodiment, the gas cylinder group 32 includes a plurality of gas cylinders 321, and each gas cylinder 321 is communicated with a safety valve 322, so as to avoid excessive pressure of the gas cylinder 321 and play a safety role.

[0054] As a preferred technical solution of the embodiment, at least part of the gas cylinders 321 are communicated with electromagnetic valves 323, and whether the corresponding gas cylinder 321 is put into work is controlled through the electromagnetic valve 323. The number of the gas cylinders 321 is calculated and determined according to the specification of the driving cylinder 1. During normal work, a certain number of gas cylinders 321 should be ensured to be always communicated with the energy accumulator 31, so as to avoid excessive compression ratio of the gas cavity 312 of the energy accumulator 31 and damage the energy accumulator 31.

[0055] As a preferred technical solution of the embodiment, the air compressor 33 includes an air compressor, a dryer, a gas storage tank and a booster which are communicated in sequence, and the outlet of the booster is communicated with the gas cylinder group 32.

[0056] As a preferred technical solution of the embodiment, a on-off valve is arranged between the energy accumulator 31 and the gas cylinder group 32 and between the energy accumulator 31 and the third cavity 13 of the driving cylinder 1, so as to control the on-off between the energy accumulator 31 and the gas cylinder group 32 and between the energy accumulator 31 and the third cavity 13 of the driving cylinder 1. Specifically, a first on-off valve 341 is arranged between the energy accumulator 31 and the third cavity 13 of the driving cylinder 1, and a second on-off valve 342 is arranged between the energy accumulator 31 and the gas cylinder group 32. Preferably, the first on-off valve 341 and the second on-off valve 342 can be selected but are not limited to electromagnetic switch valves. During the vertical lifting process, the force borne by the driving cylinder 1 gradually decreases with the increase of the pile frame angle, when the pile frame reaches a certain angle, the first on-off valve 341 and the second on-off valve 342 are disconnected, that is, the communication between the energy accumulator 31 and the third cavity 13 is disconnected. During the falling process, the force borne by the driving cylinder 1 increases with the decrease of the pile frame angle, at this time, the first on-off valve 341 and the second on-off valve 342 are opened, that is, the energy accumulator 31 and the third cavity 13 are communicated, then the gravitational potential energy of the pile frame is converted into the pressure potential energy of the gas in the gas cylinder 321, the energy loss is reduced, and the overall heat generation of the system is reduced.

[0057] As a preferred technical solution of the embodiment, a one-way valve 35 is arranged between the air compressor 33 and the gas cylinder group 32, so as to control the one-way flow of the gas of the air compressor 33 to the gas cylinder group 32, and the gas will not flow in the opposite direction to damage the air compressor 33.

[0058] As a preferred technical solution of the embodiment, the gas cylinder group 32 is further provided with an exhaust valve 36, which can be used to exhaust the gas in the gas cylinder 321 of the gas cylinder group 32. When the device is not used for a period of time, the gas can be exhausted through the exhaust valve 36 to avoid danger of the gas cylinder 321. The exhaust valve 36 can be selected but is not limited to a solenoid valve.

[0059] The oil supplementing unit 4 is used to supplement oil for the driving cylinder 1. As shown in the figure, the oil supplementing unit 4 comprises an oil supplementing pump 41 and an oil supplementing valve 42, the pump outlet of the oil supplementing pump 41 is in communication with the first cavity 11 and the second cavity 12, and the oil supplementing pump 41 supplements oil for the third cavity 13 under the control of the oil supplementing valve 42. Figure 8

[0060] As a preferred technical solution of the embodiment, the oil supplementing pump 41 is driven to work by a driving motor 43, the pump outlet of the oil supplementing pump 41 is in communication with the pressure oil port of the oil supplementing valve 42, the working oil port of the oil supplementing valve 42 is in communication with the third cavity 13, and the oil supplementing valve 42 can control the pressure medium pumped out by the oil supplementing pump 41 to enter the third cavity 13 or return to oil.

[0061] As a preferred technical solution of the embodiment, a third one-way valve 45 is arranged between the oil supplementing pump 41 and the oil supplementing valve 42 to control the one-way flow of the pressure medium pumped out by the oil supplementing pump 41 to the oil supplementing valve 42.

[0062] As a preferred technical solution of the embodiment, the pump outlet of the oil supplementing pump 41 is further in communication with a fifth overflow valve 44, and the oil pressure can be released through the fifth overflow valve 44 when the oil pressure is too high.

[0063] As a preferred technical solution of the embodiment, the pump outlet of the oil supplementing pump 41 is in communication with the first cavity 11 and the second cavity 12 through an oil circuit, and a one-way valve can be arranged on the oil circuit to control the one-way flow of the pressure medium.

[0064] As a preferred technical solution of the embodiment, the energy storage unit 3 and the oil supplementing unit 4 do not communicate with the third cavity 13 at the same time. That is, when the first on-off valve 341 and the second on-off valve 342 are connected, the energy storage unit 3 is in communication with the third cavity 13, at this time, the oil supplementing valve 42 disconnects the communication between the oil supplementing pump 41 and the third cavity 13. When the first on-off valve 341 and the second on-off valve 342 are disconnected, the energy storage unit 3 is not in communication with the third cavity 13, at this time, the oil supplementing valve 42 controls the oil supplementing pump 41 to be in communication with the third cavity 13, and the third cavity 13 can be supplemented with oil.

[0065] The driving unit 2 provides pressure medium for the driving cylinder 1 under the control of the control valve group 5. As shown in the figure, Figure 9 ​As shown, the control valve group 5 includes two hydraulic control valves and two control valves, the two hydraulic control valves are respectively a first hydraulic control valve 511 and a second hydraulic control valve 512, the first hydraulic control valve 511 is located on an oil path connecting the oil port PA of the closed pump 21 and the first cavity 11, and the second hydraulic control valve 512 is located on an oil path connecting the oil port PB of the closed pump 21 and the second cavity 12. Both of the two hydraulic control valves have a hydraulic control cavity, and two control valves control the two hydraulic control cavities to introduce pressure medium or return oil into the corresponding first cavity 11 or second cavity 12. The two control valves are respectively a first control valve 521 and a second control valve 522, the first control valve 521 controls the hydraulic control cavity of the first hydraulic control valve 511 to introduce pressure medium or return oil into the first cavity 11, and the second control valve 522 controls the hydraulic control cavity of the second hydraulic control valve 512 to introduce pressure medium or return oil into the second cavity 12.

[0066] As a preferred technical solution of the embodiment, the first hydraulic control valve 511 and the second hydraulic control valve 512 are the same in structure, and the two hydraulic control valves can be selected but are not limited to hydraulic control two-way plug-in valves; the first control valve 521 and the second control valve 522 are the same in structure, and the two control valves can be set as two-position three-way valves. Specifically, when the two control valves are in an initial state, the hydraulic control cavities of the two hydraulic control valves are communicated with the oil tank 6, the two hydraulic control cavities are in a low pressure state, so that the two hydraulic control valves are easily opened, the oil port PA is communicated with the first cavity 11, and the oil port PB is communicated with the second cavity 12; after the two control valves are switched, the hydraulic control cavity of the first hydraulic control valve 511 is communicated with the first cavity 11, the hydraulic control cavity of the second hydraulic control valve 512 is communicated with the second cavity 12, and the two hydraulic control cavities are in a non-low pressure state, so as to lock the driving cylinder 1 and make the driving cylinder 1 stop moving.

[0067] As a preferred technical solution of the embodiment, the two control valves are switched under the control of the on-off valve 53. Specifically, the two control valves are switched under the control of pilot pressure medium, and the pilot pump 22 provides pilot pressure medium for the two control valves under the control of the on-off valve 53. The on-off valve 53 can be selected but is not limited to an electromagnetic on-off valve, and the on-off valve 53 controls the pilot cavities of the two control valves to introduce pilot pressure medium or return oil.

[0068] As a preferred technical solution of the embodiment, a second one-way valve 282 is further arranged between the pump outlet of the pilot pump and the on-off valve 53, and the pilot pressure medium is unidirectionally communicated to the on-off valve 53.

[0069] As a preferred technical solution of the embodiment, the oil path connecting the oil port PA and the first cavity 11 is further communicated with a sixth overflow valve 541, and the oil path connecting the oil port PB and the second cavity 12 is further communicated with a seventh overflow valve 542.

[0070] Based on the above technical solution, the working principle of the energy recovery variable amplitude hydraulic system of the piling ship of the embodiment is as follows:

[0071] Preparation work:

[0072] According to the total weight of the pile frame and the pile, the force of the driving cylinder 1 during the whole process of pile erecting and pile falling is calculated, and then the inflation pressure P0 of the partial gas cylinder 321 of the energy storage unit 3 is calculated. Before inflation, the pile frame should be ensured to be in the initial position, the exhaust valve 36 is opened, the piston 313 of the accumulator 31 is moved to the end close to the gas cylinder 321, and a certain safety distance is left. During inflation, the first on-off valve 341, the second on-off valve 342 and the exhaust valve 36 are kept in the disconnected state, that is, the gas cylinder group 32 and the accumulator 31 are not connected.

[0073] Pile erecting work:

[0074] The motor 22 drives the closed pump 21 and the pilot pump 22, the driving motor 43 drives the oil supplement pump 41, the first on-off valve 341 and the second on-off valve 342 are opened, and the accumulator 31 is communicated with the third cavity 13;

[0075] The switch valve 53 of the control valve group 5 is powered to be unlocked, and the oil port PA and the oil port PB of the closed pump 21 are communicated with the first cavity 11 and the second cavity 12 respectively;

[0076] The closed pump 21 is controlled to extend by giving a certain signal to the proportional valve 25 and a certain motor speed.

[0077] When the driving cylinder 1 extends for a distance, that is, the pile frame has a certain angle, the force of the driving cylinder 1 is small, at this time, the accumulator 3 needs to be disconnected, the first on-off valve 341 and the second on-off valve 342 are closed, and the communication between the accumulator 31 and the third cavity 13 is disconnected. A certain signal is given to the oil supplement valve 42, and the pump outlet of the oil supplement pump 41 is communicated with the third cavity 13. At this time, the driving cylinder 1 continues to move to the specified position, the third cavity 13 is supplemented by the oil supplement pump 41, and the accumulator 3 does not work.

[0078] Pile driving work:

[0079] When the pile frame reaches the specified position (pile driving position), the switch valve 53 loses power, at this time, the first cavity 11 and the second cavity 12 of the driving cylinder 1 are locked, which ensures that the pile frame will not move during pile driving.

[0080] Pile falling work:

[0081] After the pile driving is completed, the switch valve 53 is powered, at this time, the first cavity 11 and the second cavity 12 of the driving cylinder 1 are unlocked, the oil port PA and the oil port PB are communicated with the first cavity 11 and the second cavity 12 respectively; the driving cylinder 1 is passively retracted under the load of the pile frame by giving a certain signal to the proportional valve 25 of the closed pump 21 and a certain motor speed, and then the closed pump 21 is driven to rotate, and then the motor 23 is passively rotated, thereby converting the gravitational potential energy of the pile frame into electrical energy and storing it in the power system.

[0082] When the driving cylinder 1 retracts a distance, i.e. the pile frame reaches a certain angle, the oil supplement valve 42 is given a signal, the first on-off valve 341 and the second on-off valve 342 of the energy storage unit 3 are electrified, and the accumulator 31 is communicated with the third cavity 13. The driving cylinder 1 continues to retract, and the gravitational potential energy of the pile frame is converted into the pressure potential energy of the gas cylinder group 32, so that the energy is recovered. At the same time, the motor 23 is passively rotated, and the gravitational potential energy of the pile frame is converted into electric energy and stored in the electric power system.

[0083] If the system is not used for a long time after completing the work, the exhaust valve 36 of the energy storage unit should be opened to exhaust the high-pressure gas in the gas cylinder 321. The overflow valve in the system plays a safety role to ensure the safety of the system. The check valve controls the one-way flow of the pressure medium, avoids the reverse flow of the pressure medium, and avoids the damage to the structure.

[0084] The embodiments of the utility model are described in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.

Claims

1. An energy recovery variable amplitude hydraulic system for a pile driving barge, characterized by, The utility model relates to a kind of hydraulic drive system, including: Drive cylinder (1), the drive cylinder (1) including separate first cavity (11), second cavity (12) and third cavity (13), pressure medium is loaded to the first cavity (11) and the third cavity (13) and makes the drive cylinder (1) extend, pressure medium is loaded to the second cavity (12) and makes the drive cylinder (1) retract, the acting area of the first cavity (11) and the second cavity (12) is equal; Drive unit (2), the drive unit (2) including closed pump (21), the closed pump (21) drives pressure medium to be loaded to the first cavity (11) or second cavity (12), potential energy acts, second cavity (12) exhaust pressure medium drives the closed pump (21) movement to store energy; Energy storage unit (3), the energy storage unit (3) provides pressure medium to be loaded to the third cavity (13), potential energy acts, the third cavity (13) exhaust pressure medium makes energy storage unit (3) energy storage; Oil supplement unit (4), the oil supplement unit (4) is oil for the drive cylinder (1).

2. The energy recovery hydraulic system for a pile driving barge of claim 1, wherein, The drive cylinder (1) includes cylinder body (14) and piston element (15), the inner bottom surface of the cylinder body (14) is formed with hollow pipe (16) being communicated with outside, the piston element (15) is hollow structure, the piston element (15) moves along the inner wall of the cylinder body (14) and the hollow pipe (16), the first cavity (11) is formed in the piston element (15), the piston element (15) separates the second cavity (12) and the third cavity (13) in the cylinder body (14).

3. The energy recovery hydraulic system for a pile driving barge according to claim 1, wherein, The energy storage unit (3) includes energy accumulator (31), gas cylinder group (32) and air compressor (33), the energy accumulator (31) includes piston (313) separated liquid cavity (311) and gas cavity (312), the liquid cavity (311) is communicated with the third cavity (13), the gas cavity (312) is communicated with the gas cylinder group (32), the air compressor (33) is for the gas cylinder group (32) pre-charged gas, the liquid cavity (311) to the third cavity (13) between, the gas cavity (312) to the gas cylinder group (32) between are provided with on-off valve of control on-off.

4. A pile driving barge energy recovery variable amplitude hydraulic system according to claim 3, wherein, The air compressor (33) to the gas cylinder group (32) between being provided with one-way valve (35), the gas cylinder group (32) is also provided with exhaust valve (36).

5. The energy recovery hydraulic system for a pile driving barge of claim 1, wherein, The oil supplement unit (4) includes oil supplement pump (41) and oil supplement valve (42), the pump outlet of the oil supplement pump (41) is communicated with the first cavity (11), second cavity (12), the oil supplement pump (41) is under the control of oil supplement valve (42) and is oil for the third cavity (13).

6. A pile driving barge energy recovery variable amplitude hydraulic system according to any one of claims 1-5, wherein, The oil supplement unit (4) and the energy storage unit (3) do not simultaneously communicate the third cavity (13).

7. The energy recovery hydraulic system for a pile driving barge of claim 1, wherein, The drive unit (2) further includes pilot pump (22), the closed pump (21) is driven by motor (23), the closed pump (21) and the pilot pump (22) are coaxially connected, the pilot pump (22) provides pilot pressure medium to variable mechanism (24) to adjust the displacement of closed pump (21).

8. A pile driving barge energy recovery variable amplitude hydraulic system according to claim 7, wherein, The closed pump (21) provides pressure medium for the driving cylinder (1) under the control of the control valve group (5).

9. A pile driving barge energy recovery variable amplitude hydraulic system according to claim 8, wherein, Two oil ports of the closed pump (21) are connected with the first chamber (11) and the second chamber (12) through two oil paths respectively, the control valve group (5) comprises two hydraulic control valves and two control valves, the two hydraulic control valves are respectively arranged on the two oil paths to control the on-off of the oil paths, the hydraulic control valves have hydraulic control chambers, the two control valves control the pressure medium or the return oil of the corresponding first chamber (11) or second chamber (12) introduced into the two hydraulic control chambers respectively, and the two control valves are reversed under the action of the pilot oil provided by the pilot pump (22).

10. A pile driving barge energy recovery variable amplitude hydraulic system according to claim 9, wherein, The two control valves introduce the pilot oil under the control of the on-off valve at the same time, and the two control valves control the two hydraulic control chambers to be connected with the pressure medium of the corresponding first chamber (11) or second chamber (12) or return oil at the same time.

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