阅读说明：本技术 一种新型组合式液压势能再生系统 (Novel combined hydraulic potential energy regeneration system ) 是由 贺湘宇 谭丽莎 蒋瑛 肖广鑫 蒋梦军 袁玉林 于 2020-07-06 设计创作，主要内容包括：本发明公开一种新型组合式液压势能再生系统,包括油箱、工作单元、增压单元、储能单元、控制单元和动力单元；其中,工作单元有主液压缸、负载、辅助液压缸；压力单元有双作用增压缸、单向阀、两位四通电磁换向阀；储能单元有蓄能器；控制单元有单向阀、三位四通电磁换向阀、两位两通电磁换向阀；动力单元有液压泵和电动机。本发明旨在负载下降时,将负载产生的势能转为油液压力能,油液经管道流进一双作用增压缸,根据增压缸工作原理,可将输入压力变换为较高压力输出并储存到蓄能器,在负载上升时,推动两辅助液压缸活塞杆由无杆腔向有杆腔移动,共同辅助主液压缸推动负载上升,以提高回路能量回收利用率,实现液压能量再生,达到节能的效果。(The invention discloses a novel combined hydraulic potential energy regeneration system, which comprises an oil tank, a working unit, a pressurization unit, an energy storage unit, a control unit and a power unit, wherein the working unit is connected with the oil tank; wherein, the working unit comprises a main hydraulic cylinder, a load and an auxiliary hydraulic cylinder; the pressure unit is provided with a double-acting pressure cylinder, a one-way valve and a two-position four-way electromagnetic reversing valve; the energy storage unit is provided with an energy accumulator; the control unit is provided with a one-way valve, a three-position four-way electromagnetic reversing valve and a two-position two-way electromagnetic reversing valve; the power unit has a hydraulic pump and an electric motor. The invention aims to convert potential energy generated by a load into oil pressure energy when the load is lowered, the oil flows into a double-acting pressure cylinder through a pipeline, input pressure can be converted into higher pressure according to the working principle of the pressure cylinder, the higher pressure is output and stored in an energy accumulator, when the load rises, piston rods of two auxiliary hydraulic cylinders are pushed to move from a rodless cavity to a rod cavity, and the two auxiliary hydraulic cylinders together push the load to rise, so that the energy recovery utilization rate of a loop is improved, the hydraulic energy regeneration is realized, and the effect of saving energy is achieved.)

1. The invention discloses a novel combined hydraulic potential energy regeneration system, which comprises an oil tank, a working unit (10), a pressurization unit (20), an energy storage unit (30), a control unit (40) and a power unit (50);

the working unit (10) comprises a first auxiliary hydraulic cylinder (11), a main hydraulic cylinder (12), a load (13) and a second auxiliary hydraulic cylinder (14);

the pressurization unit (20) comprises a first one-way valve (21), a double-acting pressurization cylinder body (22), a piston rod (23), a piston (24), a second one-way valve (25), a third one-way valve (26) and a fourth one-way valve (27), wherein the piston (24) is fastened in the middle position of the piston rod (23) and can freely slide in the double-acting pressurization cylinder body (22);

the energy storage unit (30) comprises an accumulator (31);

the power unit (50) comprises a hydraulic pump (51) and an electric motor (52);

the method is characterized in that:

the control unit (40) comprises a one-way valve (41), a first two-position two-way electromagnetic reversing valve (42), a three-position four-way electromagnetic reversing valve (43), a second two-position two-way electromagnetic reversing valve (44), a third two-position two-way electromagnetic reversing valve (45), a fourth two-position two-way electromagnetic reversing valve (46), a fifth two-position two-way electromagnetic reversing valve (47) and a two-position four-way electromagnetic reversing valve (48);

the load (13) is respectively connected with piston rods of a first auxiliary hydraulic cylinder (11), a main hydraulic cylinder (12), a second auxiliary hydraulic cylinder (14) and the like, and oil ports of rod cavities of the first auxiliary hydraulic cylinder (11) and the second auxiliary hydraulic cylinder (14) are connected with an oil tank; the rodless cavity oil ports of the first auxiliary hydraulic cylinder (11) and the second auxiliary hydraulic cylinder (14) are connected and then combined into an oil path, the oil path is respectively connected with a port B of a fourth two-position two-way electromagnetic directional valve (46) and a port A of a fifth two-position two-way electromagnetic valve (47), the port A of the fourth two-position two-way electromagnetic directional valve (46) is connected with an energy accumulator (31), and the port B of the fifth two-position two-way electromagnetic valve (47) is connected with an oil tank;

an oil port of a rod cavity of the main hydraulic cylinder (12) is connected with a port B of the three-position four-way electromagnetic directional valve (43); an oil port of a rodless cavity of the main hydraulic cylinder (12) is respectively connected with two oil ways, the first oil way is connected with an A port of a three-position four-way electromagnetic directional valve (43), and the second oil way is connected with a B port of a second two-position two-way electromagnetic valve (44); an opening A of the second two-position two-way electromagnetic valve (44) is connected with an opening C of the two-position four-way electromagnetic reversing valve (48), the opening A of the two-position four-way electromagnetic reversing valve (48) is divided into two oil ways, the first one is connected with an opening A of the double-acting pressure cylinder body (22), and the second one is connected with an oil inlet of the third one-way valve (26); the oil outlet of the third one-way valve (26) is divided into two oil paths: the first one is connected with a port C of a cylinder body (22) of the double-acting booster cylinder, the second one is connected with an oil inlet of a first one-way valve (21), and an oil outlet of the first one-way valve (21) is continuously divided into two oil ways: the first one is connected to an oil outlet of the second one-way valve (25), the other one is connected with a port B of a third two-position two-way electromagnetic directional valve (45), and a port A of the third two-position two-way electromagnetic directional valve (45) is connected with the energy accumulator 31;

an oil inlet of the second one-way valve (25) is divided into two oil ways, the first oil way is connected to a D port of a cylinder body (22) of the double-acting pressure cylinder, and the second oil way is connected with an oil outlet of a fourth one-way valve (27); an oil inlet of the fourth one-way valve (27) is continuously divided into two oil ways, the first oil way is connected with a port B of the double-acting pressure cylinder body (22), the second oil way is connected with a port B of the two-position four-way electromagnetic reversing valve (48), and a port D of the two-position four-way electromagnetic reversing valve (48) is connected with an oil tank;

the port C of the three-position four-way electromagnetic directional valve (43) is connected with an oil outlet of a hydraulic pump (51), an oil inlet of the hydraulic pump (51) is connected with an oil outlet of the one-way valve (41), and an oil inlet of the one-way valve (41) is connected to an oil tank; and a D port of the three-position four-way electromagnetic directional valve (43) is connected with an A port of the first two-position two-way electromagnetic directional valve (42), and a B port of the first two-position two-way electromagnetic directional valve (42) is connected with an oil tank.

2. The combined hydraulic potential energy regeneration system of claim 1, wherein: the working strokes of a main hydraulic cylinder (12), a first auxiliary hydraulic cylinder (11) and a second auxiliary hydraulic cylinder (14) in the working unit (10) are equal.

3. The combined hydraulic potential energy regeneration system of claim 1, wherein: the electromagnetic valve control device is characterized in that a normal position in the first two-position two-way electromagnetic directional valve (42), the second two-position two-way electromagnetic valve (44), the third two-position two-way electromagnetic directional valve (45), the fourth two-position two-way electromagnetic directional valve (46), the fifth two-position two-way electromagnetic directional valve (47) and the two-position four-way electromagnetic directional valve (48) is a position far away from the electromagnetic valve, a control position is a position close to the electromagnetic valve, a middle position of the three-position four-way electromagnetic directional valve (43) is a normal position, a left position and a right position are control positions, the normal position refers to the position where the electromagnetic valve is located in a power-off state, and the control position refers to the position where the electromagnetic valve is located in a power-on.

4. The invention discloses a novel combined hydraulic potential energy regeneration system, which comprises an oil tank, a working unit (110), a pressurization unit (120), an energy storage unit (130), a control unit (140) and a power unit (150);

the working unit (110) comprises a first inverted auxiliary hydraulic cylinder (111), a main hydraulic cylinder (112), a load (113), a second inverted auxiliary hydraulic cylinder (114) and a connecting rod (115);

the pressurization unit (120) comprises a first one-way valve (121), a double-acting pressurization cylinder body (122), a piston rod (123), a piston (124), a second one-way valve (125), a third one-way valve (126) and a fourth one-way valve (127), wherein the piston (124) is fastened in the middle position of the piston rod (123) and can freely slide in the double-acting pressurization cylinder body (122);

the energy storage unit (130) comprises an accumulator (131);

the power unit (150) comprises a hydraulic pump (151), an electric motor (152);

the method is characterized in that:

the control unit (140) comprises a one-way valve (141), a first two-position two-way electromagnetic directional valve (142), a three-position four-way electromagnetic directional valve (143), a second two-position two-way electromagnetic directional valve (144), a third two-position two-way electromagnetic directional valve (145), a fourth two-position two-way electromagnetic directional valve (146), a fifth two-position two-way electromagnetic directional valve (147) and a two-position four-way electromagnetic directional valve (148);

the load (113) is connected to a piston rod of the master cylinder (112) and the bottoms of the first inverted auxiliary hydraulic cylinder (111) and the second inverted auxiliary hydraulic cylinder (114), respectively; the connecting rod (115) is respectively connected with the piston rods of the first inverted auxiliary hydraulic cylinder (111) and the second inverted auxiliary hydraulic cylinder (114) and the bottom of the main hydraulic cylinder (112); oil ports of rod cavities of the first inverted auxiliary hydraulic cylinder (111) and the second inverted auxiliary hydraulic cylinder (114) are connected with an oil tank; the rodless cavity oil ports of the first inverted auxiliary hydraulic cylinder (111) and the second inverted auxiliary hydraulic cylinder (114) are connected and then combined into an oil path, the oil path is respectively connected with a port B of a fourth two-position two-way electromagnetic directional valve (146) and a port A of a fifth two-position two-way electromagnetic valve (147), wherein the port A of the fourth two-position two-way electromagnetic directional valve (146) is connected with an energy accumulator (131), and the port B of the fifth two-position two-way electromagnetic valve (147) is connected with an oil tank;

an oil port of a rod cavity of the master hydraulic cylinder (112) is connected with a port B of the three-position four-way electromagnetic directional valve (143); an oil port of a rodless cavity of the main hydraulic cylinder (112) is respectively connected with two oil ways, the first oil way is connected with an A port of the three-position four-way electromagnetic directional valve (143), and the second oil way is connected with a B port of the second two-position two-way electromagnetic valve (144); an A port of the second two-position two-way electromagnetic valve (144) is connected with a C port of the two-position four-way electromagnetic reversing valve (148), the A port of the two-position four-way electromagnetic reversing valve (148) is divided into two oil ways, the first port is connected with the A port of the double-acting pressure cylinder body (122), and the second port is connected with an oil inlet of the third one-way valve (126); the oil outlet of the third one-way valve (126) is divided into two oil paths: the first one is connected with a port C of a cylinder body (122) of the double-acting booster cylinder, the second one is connected with an oil inlet of a first one-way valve (121), and an oil outlet of the first one-way valve (121) is continuously divided into two oil paths: the first one is connected to an oil outlet of the second one-way valve (125), the other one is connected with a port B of a third two-position two-way electromagnetic directional valve (145), and a port A of the third two-position two-way electromagnetic directional valve (145) is connected with an energy accumulator (131);

an oil inlet of the second one-way valve (125) is divided into two oil paths, the first oil path is connected to a D port of a double-acting pressure cylinder body (122), and the second oil path is connected with an oil outlet of a fourth one-way valve (127); an oil inlet of a fourth one-way valve (127) is continuously divided into two oil paths, the first oil path is connected with a port B of a cylinder body (122) of the double-acting pressure cylinder, the second oil path is connected with a port B of a two-position four-way electromagnetic reversing valve (148), and a port D of the two-position four-way electromagnetic reversing valve (148) is connected with an oil tank;

the port C of the three-position four-way electromagnetic reversing valve (143) is connected with an oil outlet of a hydraulic pump (151), an oil inlet of the hydraulic pump (151) is connected with an oil outlet of a one-way valve (141), and an oil inlet of the one-way valve (141) is connected to an oil tank; and a port D of the three-position four-way electromagnetic directional valve (143) is connected with a port A of the first two-position two-way electromagnetic directional valve (142), and a port B of the first two-position two-way electromagnetic directional valve (142) is connected with an oil tank.

Technical Field

The invention relates to a novel combined hydraulic potential energy regeneration system.

Background

The hydraulic technology is one of the key technologies for realizing modern transmission and control, and countries in the world pay great attention to the development of the hydraulic industry. At present, the hydraulic technology can realize stepless speed regulation, has large power-weight ratio and small volume, can realize quick start, braking and frequent reversing, is widely applied to various large engineering fields, and is expected to be applied to wider fields in the future. However, the hydraulic technology has the disadvantage of low transmission efficiency, so that energy conservation of the hydraulic cylinder has attracted extensive attention and attention.

The invention converts the gravitational potential energy generated when the load is reduced into the pressure energy of the hydraulic oil, the hydraulic oil flows through a single-action pressure cylinder after being transported by a pipeline, the input pressure can be converted according to the working principle of the pressure cylinder, and the input pressure is output and stored into an energy accumulator at higher pressure, thereby improving the energy recovery utilization rate of a loop, better realizing the regeneration of hydraulic energy and achieving the effect of saving energy

Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.

Disclosure of Invention

The invention discloses a novel combined hydraulic potential energy regeneration system, which comprises an oil tank, a working unit, a pressurization unit, an energy storage unit, a control unit and a power unit, wherein the working unit is connected with the pressurization unit;

the working unit comprises a first auxiliary hydraulic cylinder, a main hydraulic cylinder, a load and a second auxiliary hydraulic cylinder;

the supercharging unit comprises a first one-way valve, a double-acting supercharging cylinder body, a piston rod, a piston, a second one-way valve, a third one-way valve and a fourth one-way valve, wherein the piston is fastened in the middle of the piston rod and can freely slide in the double-acting supercharging cylinder body;

the energy storage unit comprises an energy accumulator;

the power unit comprises a hydraulic pump and a motor;

the method is characterized in that:

the control unit comprises a one-way valve, a first two-position two-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, a second two-position two-way electromagnetic reversing valve, a third two-position two-way electromagnetic reversing valve, a fourth two-position two-way electromagnetic reversing valve, a fifth two-position two-way electromagnetic reversing valve and a two-position four-way electromagnetic reversing valve;

the load is respectively connected with piston rods of the first auxiliary hydraulic cylinder, the main hydraulic cylinder, the second auxiliary hydraulic cylinder and the like, and oil ports of rod cavities of the first auxiliary hydraulic cylinder and the second auxiliary hydraulic cylinder are connected with an oil tank; the rodless cavity oil ports of the first auxiliary hydraulic cylinder and the second auxiliary hydraulic cylinder are connected and then combined into an oil path, the oil path is respectively connected with a port B of a fourth two-position two-way electromagnetic directional valve and a port A of a fifth two-position two-way electromagnetic valve, the port A of the fourth two-position two-way electromagnetic directional valve is connected with an energy accumulator, and the port B of the fifth two-position two-way electromagnetic valve is connected with an oil tank;

an oil port of a rod cavity of the main hydraulic cylinder is connected with a port B of the three-position four-way electromagnetic directional valve; the oil port of the rodless cavity of the main hydraulic cylinder is respectively connected with two oil ways, the first oil way is connected with the port A of the three-position four-way electromagnetic directional valve, and the second oil way is connected with the port B of the second two-position two-way electromagnetic valve; the port A of the second two-position two-way electromagnetic valve is connected with the port C of the two-position four-way electromagnetic reversing valve, the port A of the two-position four-way electromagnetic reversing valve is divided into two oil ways, the first oil way is connected with the port A of the cylinder body of the double-acting pressure cylinder, and the second oil way is connected with the oil inlet of the third one-way valve; the oil outlet of the third one-way valve is divided into two oil paths: the first strip is connected with the C port of the cylinder body of the double-acting pressure cylinder, the second strip is connected with the oil inlet of the first one-way valve, and the oil outlet of the first one-way valve is continuously divided into two oil ways: the first one is connected to the oil outlet of the second one-way valve, the other one is connected with a port B of a third two-position two-way electromagnetic directional valve, and a port A of the third two-position two-way electromagnetic directional valve is connected with an energy accumulator;

an oil inlet of the second one-way valve is divided into two oil ways, the first oil way is connected to a port D of the double-acting pressure cylinder body, and the second oil way is connected with an oil outlet of the fourth one-way valve; an oil inlet of the fourth one-way valve is continuously divided into two oil ways, the first oil way is connected with a port B of the cylinder body of the double-acting pressure boosting cylinder, the second oil way is connected with a port B of the two-position four-way electromagnetic reversing valve, and a port D of the two-position four-way electromagnetic reversing valve is connected with an oil tank;

the port C of the three-position four-way electromagnetic directional valve is connected with an oil outlet of a hydraulic pump, an oil inlet of the hydraulic pump is connected with an oil outlet of a one-way valve, and an oil inlet of the one-way valve is connected to an oil tank; and a port D of the three-position four-way electromagnetic directional valve is connected with a port A of the first two-position two-way electromagnetic directional valve, and a port B of the first two-position two-way electromagnetic directional valve is connected with an oil tank.

Preferably, the working strokes of the main hydraulic cylinder, the first auxiliary hydraulic cylinder and the second auxiliary hydraulic cylinder in the working unit are equal.

Preferably, the "normal position" in the first two-position two-way electromagnetic directional valve, the second two-position two-way electromagnetic valve, the third two-position two-way electromagnetic directional valve, the fourth two-position two-way electromagnetic directional valve, the fifth two-position two-way electromagnetic directional valve and the two-position four-way electromagnetic directional valve is a position far away from the electromagnetic valve, the "control position" is a position close to the electromagnetic valve, the middle position of the three-position four-way electromagnetic directional valve is the "normal position", the left position and the right position are the "control positions", wherein the "normal position" is a position where the directional valve is located in a power-off state, and the "control position" is a position where the directional valve is located in a power-on state.

The invention discloses a novel combined hydraulic potential energy regeneration system, which comprises an oil tank, a working unit, a pressurization unit, an energy storage unit, a control unit and a power unit, wherein the working unit is connected with the pressurization unit;

the working unit comprises a first inverted auxiliary hydraulic cylinder, a main hydraulic cylinder, a load, a second inverted auxiliary hydraulic cylinder and a connecting rod;

the supercharging unit comprises a first one-way valve, a double-acting supercharging cylinder body, a piston rod, a piston, a second one-way valve, a third one-way valve and a fourth one-way valve, wherein the piston is fastened in the middle of the piston rod and can freely slide in the double-acting supercharging cylinder body;

the energy storage unit comprises an energy accumulator;

the power unit comprises a hydraulic pump and a motor;

the method is characterized in that:

the control unit comprises a one-way valve, a first two-position two-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, a second two-position two-way electromagnetic reversing valve, a third two-position two-way electromagnetic reversing valve, a fourth two-position two-way electromagnetic reversing valve, a fifth two-position two-way electromagnetic reversing valve and a two-position four-way electromagnetic reversing valve;

the load is respectively connected with a piston rod of the main hydraulic cylinder and the bottoms of the first inverted auxiliary hydraulic cylinder and the second inverted auxiliary hydraulic cylinder; the connecting rod is respectively connected with piston rods of the first inverted auxiliary hydraulic cylinder and the second inverted auxiliary hydraulic cylinder and the bottom of the main hydraulic cylinder; oil ports of rod cavities of the first inverted auxiliary hydraulic cylinder and the second inverted auxiliary hydraulic cylinder are connected with an oil tank; the oil ports of rodless cavities of the first inverted auxiliary hydraulic cylinder and the second inverted auxiliary hydraulic cylinder are connected and then combined into an oil path, and the oil path is respectively connected with a port B of a fourth two-position two-way electromagnetic directional valve and a port A of a fifth two-position two-way electromagnetic valve, wherein the port A of the fourth two-position two-way electromagnetic directional valve is connected with an energy accumulator, and the port B of the fifth two-position two-way electromagnetic valve is connected with an oil tank;

an oil port of a rod cavity of the main hydraulic cylinder is connected with a port B of the three-position four-way electromagnetic directional valve; the oil port of the rodless cavity of the main hydraulic cylinder is respectively connected with two oil ways, the first oil way is connected with the port A of the three-position four-way electromagnetic directional valve, and the second oil way is connected with the port B of the second two-position two-way electromagnetic valve; the port A of the second two-position two-way electromagnetic valve is connected with the port C of the two-position four-way electromagnetic reversing valve, the port A of the two-position four-way electromagnetic reversing valve is divided into two oil ways, the first oil way is connected with the port A of the cylinder body of the double-acting pressure cylinder, and the second oil way is connected with the oil inlet of the third one-way valve; the oil outlet of the third one-way valve is divided into two oil paths: the first strip is connected with the C port of the cylinder body of the double-acting pressure cylinder, the second strip is connected with the oil inlet of the first one-way valve, and the oil outlet of the first one-way valve is continuously divided into two oil ways: the first one is connected to the oil outlet of the second one-way valve, the other one is connected with a port B of a third two-position two-way electromagnetic directional valve, and a port A of the third two-position two-way electromagnetic directional valve is connected with an energy accumulator;

an oil inlet of the second one-way valve is divided into two oil ways, the first oil way is connected to a port D of the double-acting pressure cylinder body, and the second oil way is connected with an oil outlet of the fourth one-way valve; an oil inlet of the fourth one-way valve is continuously divided into two oil ways, the first oil way is connected with a port B of the cylinder body of the double-acting pressure boosting cylinder, the second oil way is connected with a port B of the two-position four-way electromagnetic reversing valve, and a port D of the two-position four-way electromagnetic reversing valve is connected with an oil tank;

the port C of the three-position four-way electromagnetic directional valve is connected with an oil outlet of a hydraulic pump, an oil inlet of the hydraulic pump is connected with an oil outlet of a one-way valve, and an oil inlet of the one-way valve is connected to an oil tank; and a port D of the three-position four-way electromagnetic directional valve is connected with a port A of the first two-position two-way electromagnetic directional valve, and a port B of the first two-position two-way electromagnetic directional valve is connected with an oil tank.

Other aspects, objects, and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawings.

Drawings

The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of the present invention in its normal position;

FIG. 2 is a schematic diagram of the operation of the load-shedding process of the present invention (1);

FIG. 3 is a schematic diagram of the operation of the load shedding process of the present invention (2);

FIG. 4 is a schematic diagram of the load lifting process of the present invention;

fig. 5 is a normal position schematic diagram of the hydraulic potential energy regeneration system of the present invention (inverted cylinder).

The reference numbers are as follows:

10-a working unit; 11-a first auxiliary hydraulic cylinder; 12-master cylinder; 13-load; 14-a second helper hydraulic cylinder; 20-a pressurizing unit; 21-a first one-way valve; 22-single-acting pressure cylinder body; 23-a piston rod; 24-a piston; 25-a second one-way valve; 26-a third one-way valve; 27-a fourth one-way valve; (ii) a 30-an energy storage unit; 31-an accumulator; 40-a control unit; 41-one-way valve; 42-a first two-position two-way electromagnetic directional valve; 43-three-position four-way electromagnetic directional valve; 44-a second two-position two-way electromagnetic directional valve; 45-a third two-position two-way electromagnetic directional valve; 46-a fourth two-position two-way electromagnetic directional valve; 47-a fifth two-position two-way electromagnetic directional valve; 48-two-position four-way electromagnetic directional valve; 50-a power unit; 51-a hydraulic pump; 52-electric motor.

Detailed Description

In order to further explain the technical scheme of the invention, the following detailed description is combined with the accompanying drawings.

As shown in fig. 1, a novel combined hydraulic potential energy regeneration system comprises an oil tank, a working unit 10, a pressurization unit 20, an energy storage unit 30, a control unit 40 and a power unit 50;

the working unit 10 comprises a first auxiliary hydraulic cylinder 11, a main hydraulic cylinder 12, a load 13 and a second auxiliary hydraulic cylinder 14;

the pressurization unit 20 comprises a first one-way valve 21, a double-acting pressurization cylinder body 22, a piston rod 23, a piston 24, a second one-way valve 25, a third one-way valve 26 and a fourth one-way valve 27, wherein the piston 24 is fastened in the middle position of the piston rod 23 and can freely slide in the double-acting pressurization cylinder body 22;

the energy storage unit 30 comprises an accumulator 31;

the power unit 50 includes a hydraulic pump 51, an electric motor 52;

the method is characterized in that:

the control unit 40 comprises a one-way valve 41, a first two-position two-way electromagnetic directional valve 42, a three-position four-way electromagnetic directional valve 43, a second two-position two-way electromagnetic directional valve 44, a third two-position two-way electromagnetic directional valve 45, a fourth two-position two-way electromagnetic directional valve 46, a fifth two-position two-way electromagnetic directional valve 47 and a two-position four-way electromagnetic directional valve 48;

the load 13 is respectively connected with piston rods of the first auxiliary hydraulic cylinder 11, the main hydraulic cylinder 12, the second auxiliary hydraulic cylinder 14 and the like, and oil ports of rod cavities of the first auxiliary hydraulic cylinder 11 and the second auxiliary hydraulic cylinder 14 are connected with an oil tank; the rodless cavity oil ports of the first auxiliary hydraulic cylinder 11 and the second auxiliary hydraulic cylinder 14 are connected and then combined into an oil path, the oil path is respectively connected with the port B of the fourth two-position two-way electromagnetic directional valve 46 and the port A of the fifth two-position two-way electromagnetic valve 47, the port A of the fourth two-position two-way electromagnetic directional valve 46 is connected with the energy accumulator 31, and the port B of the fifth two-position two-way electromagnetic valve 47 is connected with the oil tank;

an oil port of a rod cavity of the main hydraulic cylinder 12 is connected with a port B of the three-position four-way electromagnetic directional valve 43; the oil port of the rodless cavity of the master hydraulic cylinder 12 is respectively connected with two oil paths, the first is connected with the port A of the three-position four-way electromagnetic directional valve 43, and the second is connected with the port B of the second two-position two-way electromagnetic valve 44; the port A of the second two-position two-way electromagnetic valve 44 is connected with the port C of the two-position four-way electromagnetic directional valve 48, the port A of the two-position four-way electromagnetic directional valve 48 is divided into two oil paths, the first oil path is connected with the port A of the double-acting pressure cylinder body 22, and the second oil path is connected with an oil inlet of the third one-way valve 26; the oil outlet of the third check valve 26 is divided into two oil paths: the first is connected with the C port of the cylinder body 22 of the double-acting pressure cylinder, the second is connected with the oil inlet of the first one-way valve 21, and the oil outlet of the first one-way valve 21 is continuously divided into two oil paths: the first one is connected to the oil outlet of the second one-way valve 25, the other one is connected to the port B of the third two-position two-way electromagnetic directional valve 45, and the port A of the third two-position two-way electromagnetic directional valve 45 is connected with the energy accumulator 31;

the oil inlet of the second one-way valve 25 is divided into two oil paths, the first oil path is connected to the D port of the double-acting pressure cylinder body 22, and the second oil path is connected with the oil outlet of the fourth one-way valve 27; an oil inlet of the fourth check valve 27 is continuously divided into two oil paths, the first oil path is connected with a port B of the double-acting pressure cylinder body 22, the second oil path is connected with a port B of the two-position four-way electromagnetic directional valve 48, and a port D of the two-position four-way electromagnetic directional valve 48 is connected with an oil tank;

the port C of the three-position four-way electromagnetic directional valve 43 is connected with an oil outlet of a hydraulic pump 51, an oil inlet of the hydraulic pump 51 is connected with an oil outlet of a one-way valve 41, and an oil inlet of the one-way valve 41 is connected to an oil tank; the port D of the three-position four-way electromagnetic directional valve 43 is connected with the port A of the first two-position two-way electromagnetic directional valve 42, and the port B of the first two-position two-way electromagnetic directional valve 42 is connected with the oil tank.

The working strokes of the master cylinder 12, the first auxiliary cylinder 11, and the second auxiliary cylinder 14 in the working unit 10 are equal.

The "normal position" in the first two-position two-way electromagnetic directional valve 42, the second two-position two-way electromagnetic valve 44, the third two-position two-way electromagnetic directional valve 45, the fourth two-position two-way electromagnetic directional valve 46, the fifth two-position two-way electromagnetic directional valve 47 and the two-position four-way electromagnetic directional valve 48 is a position far away from the electromagnetic valves, the "control position" is a position close to the electromagnetic valves, the middle position of the three-position four-way electromagnetic directional valve 43 is the "normal position", the left position and the right position are the "control positions", wherein the "normal position" refers to a position where the directional valve is located in a power-off state, and the "control position" refers to a position where the directional valve is located in a power.

As shown in fig. 2, the working principle (1) of the descending process of the load 13 of the present invention is described as follows:

energy recovery (1): when the motor 52 is started, the first two-position two-way electromagnetic directional valve 42, the three-position four-way electromagnetic directional valve 43, the second two-position two-way electromagnetic valve 44, the third two-position two-way electromagnetic directional valve 45 and the fifth two-position two-way electromagnetic directional valve 47 are powered on and are all in the "control position", and the fourth two-position two-way electromagnetic directional valve 46 and the two-position four-way electromagnetic directional valve 48 are powered off and are all in the "normal position"; the check valves 41, 25, 26 are opened, and the first check valve 21, 27 are closed. The hydraulic oil in the oil tank flows through the control position, namely the left position C-B, of the three-position four-way electromagnetic directional valve 43 through the one-way valve 41, then flows into the oil port of the rod cavity of the main hydraulic cylinder 12 along the pipeline, the hydraulic pressure force pushes the piston rod of the main hydraulic cylinder 12 to move towards the rodless cavity, and therefore the hydraulic oil in the rodless cavity is pushed to flow out of the oil port, and the load begins to descend. The pressure oil flowing out from the rodless cavity oil port of the main hydraulic cylinder 12 flows to a second two-position two-way electromagnetic directional valve 44 right B-A oil way through a pipeline, the output pressure oil is divided into two oil ways after passing through a two-position four-way electromagnetic directional valve 48 left C-A, the first oil flows into a large cavity at the left end of the pressure cylinder through an A port of the double-acting pressure cylinder body 22, and the second oil flows into a small cavity at the left end of the pressure cylinder through a C port of the double-acting pressure cylinder body 22 after passing through a third one-way valve 26; the pressure oil pushes the piston 24 to move rightwards, so that the oil in the right large cavity flows out from the port B of the double-acting pressure cylinder body 22 and flows back to the oil tank through the left position B-D of the two-position four-way electromagnetic directional valve; after being pressurized, the oil in the right small cavity becomes high-pressure oil, the high-pressure oil flows out from a port D of the cylinder body 22 of the double-acting pressurizing cylinder, flows through the second one-way valve 25, then flows to a right position B-A of the third two-position two-way electromagnetic directional valve 45 through a pipeline, and finally flows into the energy accumulator 31, namely the gravitational potential energy of the load 13 falling is stored in the energy accumulator 31.

As shown in fig. 3, the operation principle (2) of the descending process of the load 13 of the present invention is described as follows:

energy recovery (2): in the energy recovery (1), when the pressure oil pushes the piston 24 to move to the rightmost end of the large cavity, the switch at the valve core position of the two-position four-way reversing valve 48 is touched, the two-position four-way reversing valve 48 is electrified for reversing, and the right position of the 'control position' of the two-position four-way reversing valve 48 is electrified to enter a working state. The pressure oil flowing out of the B-A of the second two-position two-way electromagnetic valve 44 flows through the right C-B of the two-position four-way electromagnetic directional valve 48 and then is divided into two oil paths, the first oil path enters the large cavity at the right end of the pressure cylinder through the B port of the double-acting pressure cylinder body 22, and the second oil path enters the small cavity at the right end of the pressure cylinder through the D port of the double-acting pressure cylinder body 22 after flowing through the fourth one-way valve 27; the pressure oil pushes the piston 24 to move leftwards, so that the oil in the left-end large cavity flows out from the port A of the cylinder body 22 of the double-acting pressure cylinder and flows back to the oil tank through the left positions A-D of the two-position four-way electromagnetic directional valve; the left end small cavity oil is pressurized and then changed into high-pressure oil to flow out of a port C of a cylinder body 22 of the double-acting pressurizing cylinder, flow through the first one-way valve 21, then flow to a right position B-A of a third two-position two-way electromagnetic directional valve 45 through a pipeline, and finally flow into the energy accumulator 31.

As shown in fig. 4, the operation principle diagram of the load lifting process of the present invention is described as follows:

energy release: the three-position four-way electromagnetic directional valve 43 and the fourth two-position two-way electromagnetic directional valve 46 are powered on and are all in a "control position", and the first two-position two-way electromagnetic directional valve 42, the second two-position two-way electromagnetic valve 44, the third two-position two-way electromagnetic directional valve 45, the fifth two-position two-way electromagnetic directional valve 47 and the two-position four-way electromagnetic directional valve 48 are powered off and are all in a "normal position"; the check valve 41 is opened, and the first check valve 21, the second check valve 25, the third check valve 26, and the fourth check valve 27 are closed. The hydraulic oil in the oil tank flows through the control position, namely the right position C-a, of the three-position four-way electromagnetic directional valve 43 through the check valve 41, then flows into the rodless cavity oil port of the master hydraulic cylinder 12 along the pipeline, the hydraulic pressure force pushes the piston rod of the master hydraulic cylinder 12 to move towards the rod cavity of the master hydraulic cylinder 12, and therefore the hydraulic oil in the rod cavity is pushed to flow out from the oil port, and the load begins to rise. The pressure oil flowing out from the oil port of the rod cavity of the master cylinder 12 flows through a pipeline to the control position of the three-position four-way electromagnetic directional valve 43, namely the right position B-D, then flows through the left position A-B of the first two-position two-way electromagnetic directional valve 42, and finally flows back to the oil tank. When a piston rod of the master cylinder 12 moves from a rodless cavity to a rod cavity, high-pressure oil pressure energy stored in the energy accumulator 31 in the energy recovery process can assist in driving the rotation of the rotary pump, so that the input of power of a rotary motor is reduced, the high-pressure oil pressure energy stored in the energy accumulator 31 flows through the right A-B positions of the fourth two-position two-way electromagnetic directional valve 46 and respectively flows into the rodless cavities of the first auxiliary cylinder 11 and the second auxiliary cylinder 14, the master cylinder 12 is assisted together to push the load 13 to ascend, the energy recovery utilization rate of a loop is improved, the hydraulic energy regeneration is better realized, and the effect of saving energy is achieved.