CN100535454C - Energy-store state-liquid driving device of secondary flow-regulation coupling hydraulic energy accumulator - Google Patents

Abstract

The utility model relates to a hydraulic accumulator energy storage hydrostatic transmission device for secondary regulation flow coupling, and relates to a secondary regulation hydrostatic transmission method and system. It solves the gap between the constant pressure network that can only allow pressure changes within a small range and the hydraulic accumulator energy recovery subsystem that requires pressure changes within a large range in the existing secondary regulation hydrostatic transmission system contradiction. It uses the hydraulic accumulator to output high-pressure oil to drive the energy-storage hydraulic pump/motor and the electric motor together to drive the hydraulic cylinder to drive the load up. When the load needs to go down, the load drives the hydraulic pump/motor and the energy-storage hydraulic pump/motor to switch working conditions respectively. , to recycle and store the potential energy generated by the hydraulic cylinder when it goes down under the action of the gravity of the load. When the load needs to go up, the energy storage hydraulic pump/motor and the load-driven hydraulic pump/motor switch their working conditions respectively, and repeat the above work. It can be used in mechanical systems that operate by lifting heavy objects, such as hoists and hydraulic pumping units.

Description

Secondary regulation flow coupling hydraulic accumulator energy storage hydrostatic transmission device

technical field

The utility model relates to a hydraulic accumulator energy storage hydrostatic transmission device for secondary adjustment flow coupling, and relates to a secondary adjustment hydrostatic transmission method and system.

Background technique

Secondary adjustment hydrostatic transmission technology is generally defined as a hydraulic transmission technology that performs closed-loop control of hydraulic pumps/motors in a constant pressure network without throttling. Since the system generally works in a pressure coupling system, it is called CPS (Common Pressure System), CPR (Common Pressure Rail), or SCS (Secondary Controlled System) in most cases. This technology has attracted more and more attention due to its advantages such as multi-load parallel connection, good control characteristics, and the ability to recover system braking kinetic energy and potential energy. Foreign countries have applied this technology to hoisting machinery, vehicle transmission, and large-scale tests. Taiwan and other fields.

However, there are also some problems in the secondary regulation hydrostatic transmission system working on the constant pressure network: First, in the process of using the hydraulic accumulator for energy recovery and reuse, there are problems that can only be achieved in a small range. The contradiction between the constant pressure network that allows pressure changes and the hydraulic accumulator energy recovery subsystem that requires pressure changes in a large range limits the recovery and reuse of energy; When the component (hydraulic cylinder or quantitative hydraulic motor) is used, the speed and other parameters cannot be directly controlled. To solve the above problems, one method is to introduce a kind of energy conversion element (hydraulic transformer) in the system, which is currently being studied in Sweden, Germany and Japan abroad, as well as Zhejiang University and Harbin Institute of Technology in my country; another The first method is to combine the secondary adjustment technology with the flow coupling system according to the requirements of the load characteristics and use the characteristics of the flow coupling system to establish a secondary adjustment flow coupling hydrostatic transmission system.

Contents of the invention

In order to solve the contradiction between the constant pressure network that can only allow pressure changes within a small range and the hydraulic accumulator energy recovery subsystem that requires pressure changes within a large range in the existing secondary regulation hydrostatic transmission system , The present invention provides a hydraulic accumulator energy storage hydrostatic transmission device for secondary regulation flow coupling.

Secondary adjustment flow coupling hydraulic accumulator energy storage hydrostatic transmission device, which includes load-driven hydraulic pump/motor, electric motor, energy storage hydraulic pump/motor, control oil circuit components, energy storage electro-hydraulic control valve components, hydraulic storage Energizer assembly, hydraulic cylinder safety valve assembly, hydraulic cylinder, upper limit sensor, lower limit sensor, load-driven electro-hydraulic control valve assembly and controller, piston rod of hydraulic cylinder and external heavy load connection, in the hydraulic cylinder An upper limit sensor and a lower limit sensor are fixed on the side of the piston rod, the distance between the upper limit sensor and the lower limit sensor is equal to the working stroke of the hydraulic cylinder, and the upper limit sensor and the lower limit sensor The electrical signal output terminals of the hydraulic cylinder are respectively connected to the control signal input terminals of the controller; one oil output port of the hydraulic cylinder is connected with the oil input port of the load-driven hydraulic pump/motor and the oil circuit input port of the hydraulic cylinder safety valve assembly, and the load-driven The oil outlet of the hydraulic pump/motor is connected to the external oil tank; the piston rod in the load-driven electro-hydraulic control valve assembly is connected to the swash plate of the load-driven hydraulic pump/motor; the oil delivery port of the energy-storage hydraulic pump/motor and hydraulic energy storage The oil delivery port of the accumulator assembly is connected, the oil outlet of the energy storage hydraulic pump/motor is in communication with the external oil tank, and the swash plate of the energy storage hydraulic pump/motor is connected with the piston rod in the energy storage electro-hydraulic control valve assembly; The control oil circuit assembly is composed of a control hydraulic pump and a relief valve. After the oil circuit input port of the relief valve is connected with the oil circuit input port of the control hydraulic pump, it is respectively connected with the load-driven electro-hydraulic control valve assembly, the energy storage electro-hydraulic The oil circuit of the control valve assembly is connected, and the oil circuit output port of the overflow valve is connected with the oil circuit output port of the control hydraulic pump and then communicated with the external oil tank; the load drives the hydraulic pump/motor, the energy storage hydraulic pump/motor and the control oil The transmission shaft of the control hydraulic pump in the circuit assembly is fixedly connected with the output shaft of the motor; the electric signal control ends of the load-driven electro-hydraulic control valve assembly and the energy storage electro-hydraulic control valve assembly are respectively connected with the control signal output end of the controller.

The invention realizes the recovery and reuse of the potential energy of heavy objects in the system, thereby achieving the effect of energy saving, reducing the installed power of the system, reducing the energy consumption of the system, and the energy saving effect can reach more than 39%. It can be widely used in hoist systems, hydraulic pumping unit systems and other mechanical systems that operate by lifting heavy objects.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the device of the present invention described in Embodiment 1; Fig. 2 is a schematic diagram of the structure of the device of the present invention described in Embodiment 2; Fig. 3 is a schematic diagram of the circuit structure of the present invention.

Implementation

Specific implementation mode 1: The hydraulic accumulator energy storage hydrostatic transmission device for secondary flow adjustment in this embodiment is driven by a load to drive a hydraulic pump/motor 1, an electric motor 2, an energy storage hydraulic pump/motor 3, and a control oil circuit assembly 4 , energy storage electro-hydraulic control valve assembly 5, hydraulic accumulator assembly 6, hydraulic cylinder safety valve assembly 7, hydraulic cylinder 8, upper limit sensor 9, lower limit sensor 10, load-driven electro-hydraulic control valve assembly 12 and controller 13 composition.

The piston rod of the hydraulic cylinder 8 is connected to an external heavy load 11, and an upper limit sensor 9 and a lower limit sensor 10 are fixed on the side of the piston rod of the hydraulic cylinder 8, and the upper limit sensor 9 and the lower limit sensor 10 The distance between them is equal to the working stroke of the hydraulic cylinder 8, and the electrical signal output terminals of the upper limit sensor 9 and the lower limit sensor 10 are respectively connected with the control signal input terminals of the controller 13; The oil port is connected with the oil delivery port of the load-driven hydraulic pump/motor 1 and the oil circuit input port of the hydraulic cylinder safety valve assembly 7, and the oil outlet of the load-driven hydraulic pump/motor 1 is connected with the external oil tank 20; the load-driven electro-hydraulic The piston rod in the control valve assembly 12 is connected to the swash plate 1-1 of the load-driven hydraulic pump/motor 1; the oil delivery port of the accumulator hydraulic pump/motor 3 communicates with the oil delivery port of the hydraulic accumulator assembly 6, and the The oil outlet of the energy storage hydraulic pump/motor 3 communicates with the external oil tank 20, and the swash plate 3-1 of the energy storage hydraulic pump/motor 3 is connected to the piston rod in the energy storage electro-hydraulic control valve assembly 5; the control oil circuit Component 4 is composed of a control hydraulic pump 4-2 and a relief valve 4-1. After the oil passage input port of the relief valve 4-1 communicates with the oil passage input port of the control hydraulic pump 4-2, it is respectively connected to the load drive The oil circuit of the electro-hydraulic control valve assembly 12 and the energy-storage electro-hydraulic control valve assembly 5 is connected, and the oil circuit output port of the overflow valve 4-1 and the oil circuit output port of the control hydraulic pump 4-2 are connected to the external oil tank 20 communication; the drive shafts of the load-driven hydraulic pump/motor 1, the energy-storage hydraulic pump/motor 3, and the control hydraulic pump 4-2 in the control oil circuit assembly 4 are respectively fixedly connected with the output shaft of the motor 2; the load-driven electro-hydraulic control The electric signal control ends of the valve assembly 12 and the energy storage electro-hydraulic control valve assembly 5 are respectively connected to the control signal output end of the controller 13 .

The load-driven electro-hydraulic control valve assembly 12 is composed of a load-driven control cylinder 12-1 and a load-driven control regulating valve 12-2, the piston rod of the load-driven control cylinder 12-1 is connected with the load-driven hydraulic pump/motor 1 The swash plate 1-1 is connected, and the two oil delivery ports of the load-driven control regulating valve 12-2 are respectively communicated with the two oil delivery ports of the load-driven control cylinder 12-1, and the load-driven control regulating valve 12-2 The other two oil delivery ports are the two oil delivery ports of the load-driven electro-hydraulic control valve assembly 12, which communicate with the oil outlet of the control oil circuit assembly 4 and the external oil tank 20 respectively. The load-driven control regulating valve 12-2 The electrical signal control end of the controller 13 is connected to the control signal output end.

The energy storage electro-hydraulic control valve assembly 5 is composed of an energy storage control cylinder 5-1 and an energy storage control regulating valve 5-2. The piston rod of the energy storage control cylinder 5-1 is connected to the energy storage hydraulic pump/motor 3 The swash plate 3-1 is connected, the two oil delivery ports of the energy storage control regulating valve 5-2 communicate with the two oil delivery ports of the energy storage control cylinder 5-1 respectively, and the energy storage control regulating valve 5-2 The other two oil delivery ports are the two oil delivery ports of the energy storage electro-hydraulic control valve assembly 5, which communicate with the oil outlet of the control oil circuit assembly 4 and the external oil tank 20 respectively.

The load-driven control regulating valve 12-2 and the energy storage control regulating valve 5-2 may be electromagnetic reversing valves, electro-hydraulic reversing valves, electro-hydraulic servo valves or electro-hydraulic proportional valves.

The control oil circuit assembly 4 provides a constant pressure hydraulic source for the load-driven electro-hydraulic control valve assembly 12 and the energy-storage electro-hydraulic control valve assembly 5, so as to ensure that the load-driven electro-hydraulic control valve assembly 12 and the energy-storage electro-hydraulic control valve Component 5 works fine.

The hydraulic accumulator assembly 6 is composed of a hydraulic accumulator 6-1, an energy storage cut-off valve 6-2, and an accumulator safety valve assembly 6-5. The stop valve 6-2 communicates with the oil delivery port of the energy storage hydraulic pump/motor 3, and the accumulator safety valve assembly 6-5 is composed of a safety stop valve 6-4 and an energy storage safety valve 6-3. The oil circuit input port of energy safety valve 6-3 communicates with an oil delivery port of safety cut-off valve 6-4 and then communicates with the oil delivery port connected with hydraulic accumulator 6-1 and energy storage cut-off valve 6-2. The oil output port of the energy storage safety valve 6-3 is connected with the other oil delivery port of the safety cut-off valve 6-4 and communicates with the external oil tank 20.

The hydraulic cylinder safety valve assembly 7 is composed of a check valve 7-2 and a hydraulic cylinder safety valve 7-1. After the input end of the hydraulic cylinder is connected to the oil circuit input end of the hydraulic cylinder safety valve assembly 7, the oil circuit output end of the hydraulic cylinder safety valve 7-1 communicates with the oil circuit output end of the check valve 7-2 and then communicates with the external The oil tank 20 communicates.

The control method of the hydrostatic transmission device for secondary flow regulation coupled with hydraulic accumulator energy storage in this embodiment is as follows:

Step 1. Under the action of the high-pressure oil output by the hydraulic accumulator assembly 6, the accumulator hydraulic pump/motor 3 in the working condition of the hydraulic motor drives the load in the hydraulic pump working condition together with the motor 2 to drive the hydraulic pump/motor 1 to rotate , the load drives the high-pressure oil output by the hydraulic pump/motor 1 to drive the hydraulic cylinder 8 to move upward and lift the load 11;

Step 2: When the hydraulic cylinder 3 moves up to the upper limit position, the upper limit sensor 9 sends an electrical signal to the controller 13, and the controller 13 simultaneously controls the load to drive the electro-hydraulic control valve assembly 12 and the energy-storage electro-hydraulic control valve assembly 5 respectively Drive the load-driven hydraulic pump/motor 1 and the storage hydraulic pump/motor 3's swash plate conversion station, so that the load-driven hydraulic pump/motor 1 and the storage hydraulic pump/motor 3 are respectively switched to the hydraulic motor working condition and the hydraulic pump working condition. condition;

Step 3: The hydraulic cylinder 8 starts to descend under the gravity of the load 11, so that the hydraulic cylinder 8 outputs high-pressure oil to drive the load in the hydraulic motor working condition to drive the hydraulic pump/motor 1 to rotate, and the load drives the hydraulic pump/motor 1 and the electric motor 2 Drive the energy-storage hydraulic pump/motor 3 in the working condition of the hydraulic pump together, and the energy-storage hydraulic pump/motor 3 outputs high-pressure oil to charge and store energy for the hydraulic accumulator assembly 6;

Step 4: When the hydraulic cylinder 8 descends to the lower limit position, the lower limit sensor 10 sends an electrical signal to the controller 13, and the controller 13 simultaneously controls the load to drive the electro-hydraulic control valve assembly 12 and the energy storage electro-hydraulic control valve assembly 5 respectively Drive the swash plate 1-1 of the load-driven hydraulic pump/motor 1 and the swash plate 3-1 of the energy-storage hydraulic pump/motor 3 to switch, so that the load-driven hydraulic pump/motor 1 and the energy-storage hydraulic pump/motor 3 are respectively converted to hydraulic pressure. Pump operating conditions and hydraulic motor operating conditions, and then return to step 1.

The hydrostatic transmission device for secondary flow adjustment coupled with hydraulic accumulator energy storage in this embodiment converts the potential energy generated by the hydraulic cylinder in the process of being driven downward by the load into hydraulic energy storage through two hydraulic pumps/motors In the hydraulic accumulator, when the device needs to lift the load, the hydraulic energy stored in the hydraulic accumulator is released through two hydraulic pumps/motors to drive the hydraulic cylinder to rise, because the gravitational potential energy in the process of the load descending can be recovered , can reduce the installed power of the system, and reasonably configure the hydraulic accumulator according to the load of the system, which can achieve a very good energy-saving effect.

Embodiment 2: The difference between this embodiment and the hydrostatic transmission device for secondary flow regulation coupled hydraulic accumulator energy storage described in Embodiment 1 is that it also includes a control oil circuit driving motor 14, a control oil circuit assembly The transmission shaft of the control hydraulic pump 4-2 in 4 is not connected with the output shaft of the motor 2, but is fixedly connected with the output shaft of the control oil passage drive motor 14.

The control oil circuit assembly 4 of this embodiment works independently and is not affected by the working condition of the transmission motor 2 .

Specific Embodiment 3: The difference between this embodiment and the secondary regulating flow coupling hydraulic accumulator energy storage hydrostatic transmission described in Embodiment 1 or 2 is that it also includes a plurality of accumulator assemblies 6, so The oil delivery ports of the plurality of hydraulic accumulator assemblies are connected in parallel and communicate with the oil delivery ports of the accumulator hydraulic pump/motor 3.

In this embodiment, multiple hydraulic accumulator assemblies 6 are used in parallel, and multiple hydraulic accumulator assemblies can be configured according to the actual site conditions and the volume and output pressure of the selected accumulator, which improves the versatility of the system .

Specific implementation mode four: In this embodiment, the secondary flow rate adjustment coupled hydraulic accumulator energy storage hydrostatic transmission device, two hydraulic accumulator assemblies 6 are selected, and the actual working condition of the hydraulic cylinder 8 is set as follows: maximum lift The load quality is 8,000kg; the maximum stroke is 6m; the stroke rate is 2-5 times/min.

The power of the process system for lifting the load up the hydraulic cylinder 8 is:

P _e + P _ac = P _L (1)

Where P _e - motor output power (kW);

P _ac — output power of hydraulic accumulator (kW);

P _L ——The power required to drive the load (kW).

When the load is in the downstroke process of energy feedback, the system power is:

P _L +P _e = P _ac (2)

The inner diameter of the selected hydraulic cylinder is 100mm, the diameter of the piston rod is 70mm, the effective stroke is 6m, and the fastest speed of the hydraulic cylinder is not less than 1m/s.

by the formula $\frac{f}{A}=\frac{8000\×9.8}{\frac{\mathrm{\π}}{4}({0.1}^2-{0.07}^2)}=19.6\mathrm{MPa},$ It can be obtained that the maximum output pressure of the hydraulic cylinder is 19.6MPa, and the maximum output power is p _L =8000×9.8×1=78.4kW.

The hydraulic accumulators 6-1 in the two hydraulic accumulator assemblies 6 are all 40L airbag hydraulic accumulators with the model NXQA-40/31.5-L, and the output power of each hydraulic accumulator is 21.6kW , then the output power of the two hydraulic accumulators is P _ac =2×21.6=43.2kW.

The load-driven hydraulic pump/motor 1 uses the A4VSO 250 swash plate variable displacement plunger pump with a displacement of 250ml/r, and the energy storage hydraulic pump/motor 3 uses the A4VSO 125 swash plate variable displacement plunger with a displacement of 125ml/r Pump.

From the formula (1), the output power of the motor 2 can be obtained as:

P _e =P _L -P _ac =78.4-43.2 =35.2kW

According to the above calculation results, a motor with a rated power of 37kW and a synchronous speed of 1500r/min is selected as the motor 2, and a Y225S-4 three-phase asynchronous motor can be selected.

The load required power of the hydraulic cylinder of this system is 78.4kW, but the actual installed power is only 37kW, which is 47.19% lower than the load required power.

The system of this embodiment is convenient for on-site debugging and measurement, and can perform stepless optimal adjustment of stroke and stroke times at any time according to working conditions, and can adapt to changes in working conditions through system parameter adjustment to ensure the best performance of the whole machine.

Claims (10)

1. Secondary adjustment flow coupling hydraulic accumulator energy storage hydrostatic transmission device, which includes load-driven hydraulic pump/motor (1), electric motor (2), energy storage hydraulic pump/motor (3), control oil circuit components (4), energy storage electro-hydraulic control valve assembly (5), hydraulic accumulator assembly (6), hydraulic cylinder safety valve assembly (7), hydraulic cylinder (8), upper limit sensor (9), lower limit sensor ( 10), load-driven electro-hydraulic control valve assembly (12) and controller (13), characterized in that the piston rod of the hydraulic cylinder (8) is connected to the external heavy load (11), and the hydraulic cylinder (8) The side of the piston rod is fixed with an upper limit sensor (9) and a lower limit sensor (10), and the distance between the upper limit sensor (9) and the lower limit sensor (10) is equal to that of the hydraulic cylinder (8) working stroke, the electrical signal output ends of the upper limit sensor (9) and the lower limit sensor (10) are respectively connected with the control signal input end of the controller (13); an oil delivery port of the hydraulic cylinder (8) At the same time, it is connected with the oil delivery port of the load-driven hydraulic pump/motor (1) and the oil circuit input port of the hydraulic cylinder safety valve assembly (7), and the oil outlet of the load-driven hydraulic pump/motor (1) and the external oil tank (20) connected; the piston rod in the load-driven electro-hydraulic control valve assembly (12) is connected to the swash plate (1-1) of the load-driven hydraulic pump/motor (1); the oil delivery port of the energy storage hydraulic pump/motor (3) and The oil delivery port of the hydraulic accumulator assembly (6) is connected, the oil outlet of the energy storage hydraulic pump/motor (3) is connected with the external oil tank (20), and the ramp of the energy storage hydraulic pump/motor (3) The disc (3-1) is connected to the piston rod in the energy storage electro-hydraulic control valve assembly (5); the control oil circuit assembly (4) is composed of a control hydraulic pump (4-2) and an overflow valve (4-1). After the oil circuit input port of the relief valve (4-1) communicates with the oil circuit input port of the control hydraulic pump (4-2), it is respectively connected with the load-driven electro-hydraulic control valve assembly (12), the energy storage electro-hydraulic control The oil circuit of the valve assembly (5) is connected, and the oil circuit output port of the overflow valve (4-1) communicates with the oil circuit output port of the control hydraulic pump (4-2) and then communicates with the external oil tank (20); the load The transmission shafts of the drive hydraulic pump/motor (1), the energy storage hydraulic pump/motor (3) and the control hydraulic pump (4-2) in the control oil circuit assembly (4) are respectively fixedly connected to the output shaft of the electric motor (2) ; The electrical signal control ends of the load-driven electro-hydraulic control valve assembly (12) and the energy-storage electro-hydraulic control valve assembly (5) are respectively connected to the control signal output ends of the controller (13). 2. The hydrostatic transmission device according to claim 1, characterized in that the load-driven electro-hydraulic control valve assembly (12) is driven by the load to control the oil cylinder (12-1 ) and a load-driven control regulating valve (12-2), the output shaft of the load-driven control cylinder (12-1) is connected with the swash plate (1-1) of the load-driven hydraulic pump/motor (1), the The two oil delivery ports of the load-driven control regulating valve (12-2) communicate with the two oil delivery ports of the load-driven control oil cylinder (12-1) respectively, and the other two oil delivery ports of the load-driven control regulating valve (12-2) The two oil delivery ports are the two oil delivery ports of the load-driven electro-hydraulic control valve assembly (12), which communicate with the oil outlet of the control oil circuit assembly (4) and the external oil tank (20) respectively, and the load-driven control regulating valve The electric signal control end of (12-2) is connected with the control signal output end of the controller (13). 3. The hydraulic accumulator energy storage hydrostatic transmission device according to claim 1, characterized in that the energy storage electro-hydraulic control valve assembly (5) is controlled by the energy storage cylinder (5-1 ) and an energy storage control regulating valve (5-2), the output shaft of the energy storage control cylinder (5-1) is connected with the swash plate (3-1) of the energy storage hydraulic pump/motor (3), the The two oil delivery ports of the energy storage control regulating valve (5-2) communicate with the two oil delivery ports of the energy storage control oil cylinder (5-1) respectively, and the other two oil delivery ports of the energy storage control regulating valve (5-2) The two oil delivery ports are two oil delivery ports of the energy storage electro-hydraulic control valve assembly (5), which are respectively connected with the oil outlet of the control oil circuit assembly (4) and the external oil tank (20). 4. The hydrostatic transmission device for secondary flow regulation coupled with hydraulic accumulator energy storage according to claim 2, characterized in that the load-driven control regulating valve (12-2) is an electromagnetic reversing valve or an electro-hydraulic reversing valve. directional valve or electrohydraulic servo valve or electrohydraulic proportional valve. 5. The hydrostatic transmission device for secondary flow adjustment coupled with hydraulic accumulator energy storage according to claim 3, characterized in that the energy storage control regulating valve (5-2) is an electromagnetic reversing valve or an electro-hydraulic reversing valve. directional valve or electrohydraulic servo valve or electrohydraulic proportional valve. 6. The hydrostatic transmission device according to claim 1, characterized in that the hydraulic accumulator assembly (6) consists of a hydraulic accumulator (6-1), The energy storage cut-off valve (6-2) and the accumulator safety valve assembly (6-5) are composed. The oil delivery port of the hydraulic accumulator (6-1) is connected with the storage The oil delivery port of the hydraulic pump/motor (3) is connected, and the accumulator safety valve assembly (6-5) is composed of a safety cut-off valve (6-4) and an energy storage safety valve (6-3). The oil circuit input port of the energy storage safety valve (6-3) communicates with an oil delivery port of the safety shut-off valve (6-4) and then connects with the hydraulic accumulator (6-1) and the energy storage shut-off valve (6-2) The connected oil delivery port is connected, and the oil output port of the energy storage safety valve (6-3) is connected with another oil delivery port of the safety stop valve (6-4) and then communicated with the external oil tank (20). 7. The hydrostatic transmission device according to claim 6, characterized in that the hydraulic accumulator (6-1) is an airbag type hydraulic accumulator. 8. The secondary adjustment flow coupling hydraulic accumulator energy storage hydrostatic transmission device according to claim 1, characterized in that the hydraulic cylinder safety valve assembly (7) consists of a check valve (7-2) and an oil cylinder safety valve (7-1), the hydraulic oil cylinder safety valve assembly (7 ), the oil circuit output end of the oil cylinder safety valve (7-1) communicates with the oil circuit output end of the check valve (7-2) and then communicates with the external oil tank (20). 9. The hydrostatic transmission device for secondary flow adjustment coupling hydraulic accumulator energy storage according to claim 1, characterized in that it also includes the control oil circuit driving motor (14), the control oil circuit assembly (4) The transmission shaft of the control hydraulic pump (4-2) is not connected with the output shaft of the motor (2), but is fixedly connected with the output shaft of the control oil circuit driving motor (14). 10. The hydrostatic transmission device according to claim 1 or 9, characterized in that it also includes a plurality of hydraulic accumulator assemblies (6), and the plurality of hydraulic accumulator assemblies (6) The oil delivery port of the accumulator assembly is connected in parallel with the oil delivery port of the accumulator hydraulic pump/motor (3).

Images