WO2013174235A1

WO2013174235A1 - Energy recycling system for working device

Info

Publication number: WO2013174235A1
Application number: PCT/CN2013/075812
Authority: WO
Inventors: 何清华; 唐中勇; 张大庆; 张云龙; 王金钢; 陈涵
Original assignee: 山河智能装备股份有限公司
Priority date: 2012-05-22
Filing date: 2013-05-17
Publication date: 2013-11-28
Also published as: AU2013265872B2; EP2853755B1; CN202926765U; EP2853755A1; SG11201407604WA; EP2853755A4; AU2013265872A1

Abstract

An energy recycling system for a working device comprises an energy converter, a pressure-retaining valve, a switching valve, an energy collector, a logic control unit, a main valve, a movable arm device and corresponding connecting components. By using this system, the potential energy generated during the lowering of the movable arm device can be controllably converted into hydraulic energy to be stored in the energy collector, and the potential energy can also be directly recycled for acting on the movable arm device in a balancing mode. The heat generated by the hydraulic system is thereby reduced, the input power of a prime motor is reduced, and the purpose of saving energy is achieved.

Description

Work unit energy recovery system

Technical field

The invention relates to a hydraulic system for controlling the flow of liquid of an energy converter, which can move mechanical components on the machine, in particular to recover energy from the energy converter and then use the recovered energy to provide a certain job Powered device.

Background technique

Construction machinery and agricultural equipment often use fluid transmission to operate various mechanical components. For example, an excavator is a commonly used construction machine, and the excavator boom often uses hydraulic oil to act on the cylinder to achieve its lifting. The hydraulic cylinder includes a cylinder having a piston that divides two chambers in the cylinder, a rod connected to the piston is coupled to the boom, and the cylinder is coupled to the main body of the excavator by extending the rod outward from the cylinder and Retracting the rod toward the cylinder to raise and lower the bracket; when the excavator is working, the position of the working device such as the cantilever, the stick, the bucket and the corresponding cylinder is constantly adjusted, especially the cantilever is often at a certain low position. Lifting to a certain high position, and then descending from a certain high position to a certain low level, due to the mass of the cantilever and the sticks and buckets acting on it, the bracket can be It only decreases under the action of gravity, and if it does not provide the resistance to fall, it is prone to weight loss during the descent. In order to prevent the weight loss when the boom is lowered, the conventional solution is to maintain the hydraulic cylinder with a certain back pressure. For this reason, a throttle device is often provided on the liquid flow return pipe, and the hydraulic oil flows back through the throttle device. The fuel tank, such that the potential energy of the cantilever is converted into heat energy, is wasted in vain. In order to prevent the damage caused by the temperature rise of the hydraulic oil to the system, a heat sink is also required. Therefore, there is a need to find an effective technique for energy recovery and reuse in hydraulic systems.

technical problem

The technical problem to be solved by the present invention is to provide a working device energy recovery system that saves energy and reduces the temperature rise of the hydraulic system hydraulic oil.

Technical solution

In order to solve the above problems, the working device potential energy recovery hydraulic system used in the present invention comprises two sets of energy converters, a main valve, a first control signal (Signal-a) and a second control signal (Signal-b) including at least a unit respectively. The inlet of the pressure energy holding valve is connected to the main valve through a switching valve, and the outlet of the pressure energy holding valve is connected to the rodless cavity of the energy converter unit, and the switching valve is connected with energy collection. The input of the logic control unit is communicatively coupled to the main valve, the energy converter unit, the first control signal (Signal-a) and the second control signal (Signal-b), and the output of the logic control unit The end is connected to the control end of the switching valve.

The two sets of energy converter units (1.1) (1.2) are respectively separated into corresponding (1.1b) (1.1c) and (1.2b) (1.2c) by the rod piston (1.1a) (1.2a). a chamber, the (1.1b), (1.2b) working chambers are respectively provided with oil ports (B1), (B2) and directly connected to the main valve port (B), the (1.1c), ( 1.2c) The working chambers are respectively provided with oil ports (A1) and (A2). The boom device (BOOM) acts on the energy converter units (1.1), (1.2). The pressure energy maintaining valve 2 includes: unit valves (2a) and (2b), a signal or valve (2c), a pressure overload protection valve (2d), a directional valve (2e), and a one-way throttle valve (2f). The unit valve (2a) is provided with a first oil port Ia, a second oil port IIa, a third oil port IIIa, and a fourth oil port IVa, and the second oil port IIa and the fourth oil port IVa communicate with each other; (2b) The fifth port Ib, the sixth port IIb, the seventh port IIIb, and the eighth port IVb are provided, and the sixth port IIb and the eighth port IVb are inter-connected, and the pressure port is fixed. (IIa) and (IIb) are respectively connected to the first working chamber port (A1) and the second working chamber port (A2) of the energy converters (1.1c) and (1.2c). The directional valve is provided with a first pressure input port k1, a second pressure input port k2, a return port (kt) and a reversing control port (Kb5), a first pressure input port k1 and a third port of the port IIIa, the seventh port IIIb are interconnected, the oil return port (kt) is connected to the oil return path (T2) and is returned to the oil tank, and the reversing control port (Kb5) is connected to the second connection of the second control signal Signal-b. Point (S2). When the reversing control port (Kb5) has no pressure, the directional valve is in the normal position, the first pressure input port k1, the second pressure input port k2 are connected, the oil return port (kt) is unblocked, and the reversing control port (Kb5) When there is pressure, the directional valve is reversed in the right position, the first pressure input port k1, the oil return port (kt) is blocked, and the second pressure input port k2 is blocked. The signal or valve includes: a third pressure input port a and a fourth pressure input port b, and a pressure output port (c). The third pressure input port a is connected to the fourth port IVa of the unit valve (2a). The four pressure input port b is connected to the eighth valve port IVb of the unit valve (2b), the pressure output port (c) is connected to the second pressure input port k2 of the directional valve and logically or thirdly takes the third pressure input port a Or the high pressure oil signal of the fourth pressure input port b. The pressure overload protection valve inlet is connected to the oil passage (G) of the second pressure input port k2 to the pressure output port c, and the output port is connected to the control oil passage (H) of the reversing control port (Kb5). The one-way control valve (2f) has a resistance to open the pressure overload protection valve output oil passage, and the pressing force acts on the reversing control port (Kb5), so that the directional valve (2e) is reversed for overload protection. , has no control effect on the second control signal (Signal-b). The switching valve includes: a first main port P1, a second main port P2, a third main port (A), a fourth main port (B), a first control port Ka4, and a second control port Kb4. The first main port P1 and the second main port P2 are respectively connected to the main valve port (A) and the energy collector port (X), and the third main port (A) and the fourth main port (B) Corresponding to the first oil port Ia and the fifth oil port Ib of the pressure energy maintaining valve, respectively, the first control port Ka4 and the second control port Kb4 are respectively associated with the third control port (Pp1) and the fourth control port of the logic control component. The control port (Pp2) is connected. When the first control port Ka4 has a signal, the switching valve is switched to the left position. At this time, the first main port P1 and the fourth main port (B) are connected, and the third main oil The port (A) is connected to the second main port P2; when the second control port Kb4 has a signal, the switching valve is switched to the right position, at this time, the first main port P1 and the third main port (A) The fourth main port (B) is connected to the second main port P2; when neither the first control port Ka4 nor the second control port Kb4 acts as a signal, the switching valve is in the normal position (median position), When the first main port P1 and the first Main port (A), the fourth main port (B) through the second main port P2 nowhere. The logic control component may be a hydraulic logic control component, an electrical logic control component, or an electro-hydraulic logic control component, and the input/output connection thereof includes: inputting (Ka2) a first connection point connected to the first control signal Signal-a (S1), the input (Ka3) is connected to the main valve port (A) to the first main oil passage (E) of the first main port P1, and the input (Kb2) is connected to the second control signal At the third connection point (S3) of Signal-b, the input (Kb3) is connected to the main valve port (B) to the first rod end port (B1) of the energy converter, and the second rod end oil The second main oil passage (F) of the port (B2); the third control port (Pp1) is connected to the first control port Ka4, and the fourth control port (Pp2) is connected to the second control port Kb4. When the two working chambers (1.1c) and (1.2c) of the energy converter units (1.1) and (1.2) are connected to the pressure oil and the other two working chambers (1.1b) and (1.2b) are connected to the fuel tank, The energy converter units (1.1), (1.2) synchronously lift the boom device (BOOM) by means of a rod piston (1.1a), (1.2a), at which time the input hydraulic energy is converted into a boom device (BOOM) Potential energy; when the two working chambers (1.1b) and (1.2b) of the energy converter units (1.1), (1.2) are connected to the other two working chambers (1.1c) and (1.2c) of the pressure oil, The boom device (BOOM) drives the rod pistons (1.1a) and (1.2a) of the energy converter units (1.1) and (1.2) to descend synchronously, and the potential energy of the boom device (BOOM) is converted into hydraulic pressure. can. The pressure energy retaining valve can prevent not only leakage of pressure oil in the working chambers (1.1c) and (1.2c) of the energy converter, but also keeps the boom device (BOOM) in place, and prevents energy conversion when not in operation. The pressure oil pressure in the two working chambers (1.1c) and (1.2c) is too high. When performing the lifting operation, the working oil can be unidirectionally introduced into the second port IIa and the sixth port IIb from the ports (Ia) and (Ib), respectively. When the lowering operation is performed, the second control signal Signal- b acts as a reversing control port (Kb5), the directional valve is reversed, and the pressure oil from the two working chambers (1.1c) and (1.2c) of the energy converter is from the second port IIa and the sixth port IIb passes into the first port Ia and the fifth port Ib, respectively. When the first control port Ka4 and the second control port Kb4 have no signal, the switching valve is in the middle position, and the boom device (BOOM) can be lifted and lowered to perform normal operation; When the control port Ka4 has a signal and the switching valve is in the left position, it is connected to the main valve port (A), the first main port P1 and the fourth main port (B), and the pressure energy is maintained. The loops of the fifth port Ib and the sixth port IIb of the valve and the port (1.2) of the energy converter unit (1.2) form a passage, and are connected to the energy collector port (X) and the second main oil at the same time. The circuit of the port P2 and the third main port (A), the first oil port Ia and the second port IIa of the pressure energy retaining valve, and the oil port (A1) of the energy converter unit (1.1) also form a passage; Connecting to the main valve port (A), the first main port P1 of the switching valve, and the third main oil when the second control port Kb4 has a signal action and the switching valve is in the right position. Port (A), the first oil port Ia and the second port IIa of the pressure energy retaining valve, and the first working chamber oil of the energy converter unit (1.1) The circuit of (A1) forms a passage, and is connected to the energy collector port (X), the second main port P2 and the fourth main port (B) of the switching valve, and the fifth oil of the pressure maintaining valve The loops of the port Ib and the sixth port IIb, the second working chamber port (A2) of the energy converter unit (1.2) form a passage. Therefore, by changing the signal action of the first control port Ka4 and the second control port Kb4, the main valve port (A), the energy collector port (X) and the energy converter unit are ensured ( The first working chamber port (A1) of 1.1) and the second working chamber port (A2) of the energy converter unit (1.2) are alternately connected to collect and utilize potential energy and realize the hot oil exchange cooling of the energy collector. the goal of. The logic control component can perform signal control on the first control port Ka4 and the second control port Kb4 of the switching valve according to the pressure of the first main oil passage (E) or the second main oil passage (F), respectively. When the pressure at the first main oil passage (E) and the second main oil passage (F) does not reach the set value of the logic control component, the first control signal Signal-a and the second control signal Signal- directly or indirectly The control numbers of b are respectively introduced into the first control port Ka4 and the second control port Kb4 of the switching valve. Otherwise, the first control port Ka4 and the second control port Kb4 of the switching valve have no signal.

Preferably, the first control signal Signal-a and the second control signal Signal-b are hydraulic pressure signals and/or electrical signals, which are directly or indirectly taken from the operating handle.

Beneficial effect

The invention has the beneficial effects that the invention is applicable to the recovery and utilization of the potential energy of the excavator type boom, and the potential energy of the boom is charged into the energy collector through the corresponding control when the boom is lowered, and the energy consumption of the arm when the excavator is performing During the operation, the stored oil is released directly by controlling the switching valve to reduce the input power of the prime mover. The invention has the advantages of simple principle, convenient control and reliable performance, and can automatically realize the hot oil exchange cooling in the energy collector, which can not only reduce the heating of the hydraulic system, save energy, but also reduce the emissions of the prime mover.

DRAWINGS

1 is a schematic view showing the structure of Embodiment 1.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

Referring to FIG. 1, a working device potential energy recovery hydraulic system includes two sets of energy converters including at least (1.1, 1.2) units, a main valve 6, a first control signal Signal-a, and a second control signal Signal-b. The inlet of the pressure energy holding valve 2 is connected to the main valve 6 via a switching valve 3, and the outlet of the pressure energy holding valve 2 is connected to the rodless chamber of the energy converter unit (1.1, 1.2). The switching valve 3 is connected to the energy harvester 4, the input of the logic control unit 5 and the main valve 6, the energy converter unit (1.1, 1.2), the first control signal Signal-a and the second control signal Signal The -b communication connection, the output of the logic control unit 5 is connected to the control terminal of the switching valve 3.

The energy converter units (1.1, 1.2) are respectively separated into corresponding working chambers (1.1b, 1.1c, 1.2b, 1.2c) by rod pistons (1.1a, 1.2a), said working chambers (1.1b, 1.2b) The working chambers are respectively provided with oil ports (B1, B2) and directly connected to the main valve port (B), and the working chambers (1.1c, 1.2c) are respectively provided with oil ports (A1) A2); the pressure energy holding valve 2 includes: a unit valve (2a, 2b), a signal or valve (2c), a pressure overload protection valve 2d, a directional valve 2e, a one-way control valve 2f, the unit The valve 2a is provided with a first oil port Ia, a second oil port IIa, a third oil port IIIa, and a fourth oil port IVa, and the second oil port IIa communicates with the fourth oil port IVa; the unit valve 2b is provided with a The five port Ib, the sixth port IIb, the seventh port IIIb, the eighth port IVb, the sixth port IIb and the eighth port IVb communicate with each other, and the second port IIa and the sixth port IIb respectively The energy converter (1.1c, 1.2c) is connected to the first working chamber port A1 and the second working chamber port A2, and the directional valve 2e is provided with a first pressure input port k1 and a second pressure input port k2. , return port kt and The reversing control port Kb5, the input port k1 is interconnected with the third port IIIa and the seventh port IIIb, the oil return port kt is connected to the oil return path T2 and is returned to the oil tank, and the reversing control port Kb5 is connected to the The main valve is input to the second connection point S2 of the second control signal Signal-b; the signal or valve 2c includes: a third pressure input port a and a fourth pressure input port b, a pressure output port c, and a third pressure The input port a is connected to the fourth port IVa of the unit valve 2a, the fourth pressure input port b is connected to the eighth port IVb of the unit valve 2b, and the pressure output port c is connected to the directional valve port k2. The high pressure oil signal of the third pressure input port a or the fourth pressure input port b is logically taken, and the inlet of the pressure overload protection valve 2d is connected to the oil path G of the oil port k2 to the pressure output port c, and the output port is connected. The control oil passage H of the reversing control port Kb5; the one-way throttle valve 2f has a resistance to the output oil passage of the pressure overload protection valve 2d, and the pressing force acts on the reversing control port Kb5. The directional valve 2e is reversed for overload protection, and has no control effect on the second control signal Signal-b; the switching valve 3 includes: First main port P1, second main port P2, third main port A, fourth main port B and first control port Ka4, second control port Kb4, first main port P1, second main The oil port P2 is respectively connected to the main valve port A and the energy collector port X, and the first main port A and the second main port B are respectively associated with the first port Ia of the pressure maintaining valve 2, The fifth port Ib is connected, and the first control port Ka4 and the second control port Kb4 are respectively connected to the third control port Pp1 and the fourth control port Pp2 of the logic control unit 5; the input and output of the logic control unit 5 The connection includes: the input Ka2 is connected to the first connection point S1 of the main valve input first control signal Signal-a, and the input Ka3 is connected to the main valve port (A) to the switching valve port (P1) At the first main oil passage E, the input Kb2 is connected to the third connection point S3 of the main valve input second control signal Signal-b, and the input Kb3 is connected to the main valve port B to the energy converter. a rod end port B1, a second main oil path F of the second rod end port B2; an output Pp1 connected to the first control port Ka4 of the switching valve 3, and an output Pp2 connection station Switching the second control valve port 3 Kb4.

The logic control component 5 is a hydraulic logic control component, an electrical logic control component or an electro-hydraulic logic control component.

Preferably, the signals Signal-a, Signal-b are hydraulic pressure signals and/or electrical signals, taken directly or indirectly from the operating handle.

Referring to Figure 1, the energy converter unit (1.1), (1.2): when the two working chambers (1.1c) and (1.2c) of the energy converter unit (1.1), (1.2) are connected to the pressure oil, the other two work. When the chambers (1.1b) and (1.2b) are connected back to the tank, the energy converter units (1.1), (1.2) synchronously lift the boom device through the rod pistons (1.1a), (1.2a) ( BOOM), at this time, the input hydraulic energy is converted into the potential energy of the boom device (BOOM); when the two working chambers (1.1b) and (1.2b) of the energy converter unit (1.1), (1.2) are connected to the pressure oil, When the two working chambers (1.1c) and (1.2c) are taken out, the boom device (BOOM) drives the rod pistons (1.1a) and (1.2a) of the energy converter units (1.1) and (1.2). The synchronous drop, when the potential energy of the boom device (BOOM) is converted into hydraulic energy.

Pressure energy holding valve 2: The pressure maintaining valve can prevent the pressure oil in the energy converter working chambers (1.1c) and (1.2c) from leaking and keeping moving when the boom device (BOOM) lifting and lowering operation is not performed. The position of the arm device in situ prevents the pressure in the energy converter working chambers (1.1c) and (1.2c) from being too high and damaging the components.

The switching valve 3: by correspondingly controlling the signals acting on the first control port Ka4 and the second control port Kb4, the following effects can be achieved: 1) by alternately turning on the main valve port (A) and the energy collector port ( X) to the energy converter (1.1c), (1.2c) two-chamber oil circuit, both for the purpose of collecting and utilizing potential energy and energy collector hot oil exchange cooling; 2) when the boom device rises and falls When the first main oil passage (E) and the second main oil passage (F) are at a pressure reaching the set pressure value of the logic control unit, the logic control unit is removed from the first control port Ka4 or the second control port Kb4. The signal, switching the valve back to the neutral position, can be used for normal operation without energy saving.

Energy Harvester 4: Collects both the potential energy of the boom unit (BOOM) and the power of the boom unit (BOOM).

The logic control component 5 is mainly used for detecting the pressure of the first main oil passage (E) or the second main oil passage (F). If the pressure does not reach the logic control component set value, the first control signal is directly or indirectly The control number of the signal-a and the second control signal Signal-b is introduced into the first control port Ka4 and the second control port Kb4 of the switching valve to perform the commutation control. Otherwise, the first control port Ka4 of the switching valve is removed, and the second control is performed. The signal of the action of the mouth Kb4.

Referring to FIG. 1, the lifting operation process: operating the handle signal to make the first control signal Signal-a effective, the main valve is switched to the left position under the action of the first control signal Signal-a, and the pressure of the main valve P oil path The oil can be passed into the main valve A port, and the main valve B port returning oil can be introduced into the main valve returning oil path T. Here, the switching valve has two working states:

1) If the main valve A port pressure (determined by the load) does not reach the logic control component set value, the logic control component introduces the first control signal Signal-a into the first control port Ka4 of the switching valve to cause The switching valve is shifted to the left position. At this time, the pressure from the main valve passes through the main valve A port, the first main port P1 and the fourth main port B of the switching valve, the fifth port Ib and the sixth oil of the pressure maintaining valve. Port IIb, energy converter A2 enters the energy converter working chamber (1.2c), at the same time, the pressure collector of the energy collector passes through the X port, the switching valve second main port P2 and the third main port A, pressure The first port Ia and the second port IIa of the valve and the port A1 of the energy converter can be kept into the working chamber (1.1c) of the energy converter. At this moment, the oil return of the working chamber (1.1b) (1.2b) of the energy converter can be The main valve B port and the main valve return oil path T flow back to the oil tank. Therefore, the energy converter performs the work lifting device through the pressure oil of the energy collector and the main valve, due to the energy collector. The auxiliary function of the work, the power of the required prime mover is automatically reduced.

2) If the main valve A port pressure (determined by the load) reaches or exceeds the logic control component set value, the logic control component causes the first control port Ka4 of the switching valve to have no signal, and the switching valve operates. In the middle position, the pressure oil from the main valve passes through the main valve A port and the first main port P1 of the switching valve, and is divided into two paths, one way from the third main port A, and the first port Ia of the pressure maintaining valve , the second port IIa, the energy converter A1 port enters the energy converter working chamber (1.1c), the other channel from the fourth main port B, the pressure energy holding valve fifth port Ib, the sixth port IIb, energy The converter A2 port enters the energy converter working chamber (1.2c), and the oil return of the energy converter working chamber (1.1b) (1.2b) can flow back to the oil tank from the main valve B port and the return oil path T, thus, energy conversion The device performs the energy-saving lifting work on the boom device (BOOM) under the action of the main valve pressure oil.

The lowering operation process: the operating handle transmits a signal to make the second control signal Signal-b effective, the main valve is switched to the right position under the action of the second control signal Signal-b, and the pressure oil of the main valve P oil passage can be passed into the main Valve B port, the main valve A port oil can be introduced into the return line T, where the switching valve also has two working states:

1) If the main valve B port pressure (determined by the load) does not reach the logic control component set value, the logic control component introduces the second control signal Signal-b into the second control port Kb4 of the switching valve to cause The switching valve is shifted into the right position. At this time, the pressure oil from the main valve enters the energy converter working chamber (1.1b) (1.2b) through the main valve B port, and the energy converter unit (1.1) working chamber (1.1c) oil The liquid enters the energy collector through the pressure energy holding valve second port IIa and the first port Ia, the third main port (A) and the second main port P2, and the energy converter unit (1.2) working chamber (1.2c) The oil passes through the pressure energy holding valve sixth port IIb and the fifth port Ib, the third main port (A) and the first main port P1, the main valve A port and the return line T to the tank, Since the back pressure of the main valve A is small, the falling back pressure of the boom device (BOOM) is mainly generated by the energy collector, and thus the potential energy of the falling of the boom device (BOOM) is mainly stored in the energy collector.

2) If the pressure of the main valve B port (determined by the load) reaches or exceeds the set value of the logic control component, the logic control component causes the second control port Kb4 of the switching valve to have no signal, and the switching valve does not Reversing and working in the neutral position, at this time, the pressure oil from the main valve enters the energy converter working chamber (1.1b) (1.2b) through the main valve B port, and the energy converter working chamber (1.1c), (1.2c) The oil passes through the third main port (A) and the fourth main port of the switching valve which can respectively hold the second port IIa of the valve and the first port Ia, the sixth port IIb and the fifth port Ib, and the switching valve. (B) After entering the main valve return line T and the returning oil tank from the first main port P1 and the main valve A port of the switching valve, the boom device (BOOM) can perform the conventional descent operation without energy storage.

The above is only the preferred embodiment of the present invention, and the present invention is not limited in any way, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Work unit energy recovery system , comprising two sets of energy converters, at least respectively comprising (1.1, 1.2) units, a main valve (6), a first control signal (Signal-a) and a second control signal (Signal-b), characterized in that: pressure energy The inlet of the holding valve (2) is connected to the main valve (6) via a switching valve (3), the outlet of the pressure energy holding valve (2) and the energy converter unit (1.1, 1.2) Without a rod cavity connection, the switching valve (3) is connected with an energy harvester (4), an input of the logic control unit (5) and the main valve (6), energy converter unit (1.1, 1.2) The first control signal (Signal-a) and the second control signal (Signal-b) are communicatively coupled, and the output of the logic control component (5) is coupled to the control terminal of the switching valve (3).
Work device energy recovery system according to claim 1 The two sets of energy converters each include at least one or more (1.1, 1.2) converter units, each of which is separated by a rod piston (1.1a, 1.2a) into a corresponding one. Working chambers (1.1b, 1.1c, 1.2b, 1.2c), the working chambers (1.1b, 1.2b) are respectively provided with oil ports (B1, B2) and with the main valve port ( B) directly connected, the working chambers (1.1c, 1.2c) are respectively provided with oil ports (A1, A2); the pressure energy maintaining valve (2) comprises: unit valves (2a, 2b), signals Or valve (2c), pressure overload protection valve (2d), directional valve (2e), one-way control valve (2f), said unit valve (2a) is provided with a first oil port (Ia), a second oil Port (IIa), third port (IIIa), fourth port (IVa), second port (IIa) and fourth port (IVa); said unit valve (2b) is provided with a fifth The oil port (Ib), the sixth port (IIb), the seventh port (IIIb), the eighth port (IVb), the sixth port (IIb) and the eighth port (IVb) communicate with each other, Second port ( IIa), the sixth port (IIb) is respectively connected to the first working chamber port (A1) and the second working chamber port (A2) of the energy converter (1.1c, 1.2c), the direction The valve (2e) is provided with a first pressure input port (k1), a second pressure input port (k2), a return port (kt) and a reversing control port (Kb5), the input port (k1) and the third port The oil port (IIIa) and the seventh oil port (IIIb) are interconnected, the oil return port (kt) is connected to the oil return path (T2) and returned to the oil tank, and the reversing control port (Kb5) is connected to the main valve input. The second connection point (S2) of the second control signal (Signal-b); the signal or valve (2c) includes: a third pressure input port (a) and a fourth pressure input port (b), a pressure output port (c) a third pressure input port (a) connected to the fourth port (IVa) of the unit valve (2a), a fourth pressure input port (b) and an eighth port of the unit valve (2b) ( IVb) connected, the pressure output port (c) is connected to the directional valve port (k2) and logically or vertically takes the high pressure of the third pressure input port (a) or the fourth pressure input port (b) The oil signal, the pressure overload protection valve (2d) inlet is connected to the oil passage (G) of the oil port (k2) to the pressure output port (c), and the output port is connected to the control oil of the reversing control port (Kb5) At the road (H); the one-way control valve (2f) has an output oil passage that blocks the pressure overload protection valve (2d), and the pressure acts on the reversing control port (Kb5), so that The directional valve (2e) is commutated for overload protection, and has no control effect on the second control signal (Signal-b); the switching valve (3) includes: a first main port (P1), a second Main port (P2), third main port (A), fourth main port (B) and first control port (Ka4), second control port (Kb4), first main port (P1), The second main port (P2) is respectively connected to the main valve port (A) and the energy collector port (X), and the first main port (A) and the second main port (B) are respectively associated with the The first oil port (Ia) and the fifth oil port (Ib) of the pressure energy retaining valve (2) are connected, and the first control port (Ka4) and the second control port (Kb4) are respectively associated with the logic control component (5) Third The control port (Pp1) and the fourth control port (Pp2) are connected; the input and output connection of the logic control component (5) includes: an input (Ka2) connected to the main valve input first control signal (Signal-a At the first connection point (S1), the input (Ka3) is connected to the main valve port (A) to the first main oil path (E) of the switching valve port (P1), and the input (Kb2) connection At a third connection point (S3) at which the main valve inputs a second control signal (Signal-b), the input (Kb3) is connected to the main valve port (B) to the first rod of the energy converter a second main oil passage (F) of the port end port (B1) and the second rod end port (B2); and an output (Pp1) connected to the first control port (Ka4) of the switching valve (3), The output (Pp2) is connected to the second control port (Kb4) of the switching valve (3).
Work device energy recovery system according to claim 1 or 2 It is characterized in that the logic control component (5) is a hydraulic logic control component, an electrical logic control component or an electro-hydraulic logic control component.
Work apparatus energy recovery system according to claim 1 or 2 The first control signal (Signal-a) and the second control signal (Signal-b) are hydraulic pressure signals and/or electrical signals, which are directly or indirectly taken from the operating handle.