A hydraulic excavator boom potential energy recovery system with independent boom drive

Abstract

The application discloses a boom independent driving type hydraulic excavator boom potential energy recovery system, comprising a main oil path module, a transmission module, an energy supply module, a three-cavity hydraulic cylinder energy recovery module, a flow regeneration energy recovery module and a temperature control module; the three-cavity hydraulic cylinder energy recovery module and the flow regeneration energy recovery module are used for recovering the potential energy of the boom descending, wherein the flow regeneration energy recovery module comprises a mechanical transmission structure, a rodless cavity oil pressure is used for driving a secondary hydraulic pump to store energy, and the energy can be reversely utilized, and the energy recovery rate is relatively high. The temperature control module can monitor the temperature of the hydraulic oil in each energy recovery loop in real time, and adjusts the temperature, so that the influence of the excessively high oil temperature on the system is prevented. The application solves the problems of low energy utilization rate and large power consumption of the hydraulic excavator, and considers the temperature control problem which is not considered in other energy recovery systems.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and particularly relates to a boom independent driving type hydraulic excavator boom potential energy recovery system. BACKGROUND

[0002] For the field of hydraulic engineering machinery, energy saving and environmental protection has been an important issue that people pay attention to. For large hydraulic excavators, the boom generally has a large mass, and in the process of boom lowering, the boom cylinder needs to overcome the gravity of the boom to prevent the boom from lowering too fast. This results in large energy waste on the one hand, and due to the throttling effect, the hydraulic oil in the pipeline has a high temperature, which causes large damage to the hydraulic components.

[0003] Therefore, it is necessary to establish an energy recovery system to solve the above problems. At present, several aspects of the boom potential energy recovery scheme of the hydraulic excavator are studied, including electrical energy recovery, energy storage type energy recovery, flow regeneration type energy recovery, and three-cavity hydraulic cylinder type energy recovery. However, the energy recovery rate of a single energy recovery method is limited, and the above problems still exist. Moreover, due to the low input-output ratio, few enterprises on the market produce such products on a large scale.

[0004] In recent years, many scholars have begun to study the boom potential energy recovery system that combines multiple energy recovery schemes. For example, the independent variable-speed volume direct-drive pure electro-hydraulic excavator energy recovery system established by combining electrical energy recovery with an energy storage device by Long of Taiyuan University of Technology, and subsequently applied for a Chinese invention patent (application number: 201410476492.1). For the boom potential energy recovery system in this part, the independent driving is adopted, and the motor is used as both a driving unit and an energy storage unit. The system also uses an energy storage device for energy storage. The gravitational potential energy in the process of boom lowering is converted among the accumulator, the direct current bus, and the motor, which improves the energy regeneration efficiency of the excavator. However, this scheme uses backflow hydraulic oil to drive the hydraulic pump to drive the motor to generate electricity. Due to the low efficiency of the generator and the existence of multiple energy conversions in this scheme, the energy conversion rate is low, and the recoverable energy is less. Moreover, due to the complexity of the working conditions, the boom is not directly lowered to the lowest position, and the intermittent rotation of the generator for power generation will cause damage to the electrical equipment.

[0005] Chinese invention patent 202210324633.2 discloses "an electro-hydraulic system and a loader", the system adopts a closed hydraulic system, and is connected with an electric motor through a bidirectional double-speed pump-motor, when the boom is lowered, the hydraulic oil drives the motor to operate to make the motor reverse, and the potential energy of the boom is recovered by using the electric control technology of inverter and common DC bus, the system adopts a flow regenerative energy recovery and an electrical energy recovery scheme, which improves the energy recovery rate, but there is still conversion between multiple energies, and the system adopts a closed hydraulic system, the temperature change of hydraulic oil in the pipeline is obvious, which will affect the hydraulic components.

[0006] Chinese invention patent 201710229357.0 discloses "a lifting system controlled by negative flow hydraulic circuit", the scheme is characterized by adopting a combination of three-cavity hydraulic cylinder and energy accumulator to recover the gravitational potential energy of the boom, and setting negative flow control at the variable pump to achieve energy-saving effect, but only three-cavity hydraulic cylinder and energy accumulator are used for energy recovery, the recovered energy is limited, the energy recovery rate is small, and the temperature of hydraulic oil will increase when flowing back and forth in the three-cavity hydraulic cylinder and the energy accumulator through the hydraulic pipeline and valve, which will affect the hydraulic components. SUMMARY

[0007] In view of the deficiencies of the prior art, the purpose of the present application is to provide a boom independent drive type hydraulic excavator boom potential energy recovery system to realize efficient recovery and reverse utilization of the gravitational potential energy of the boom, and to prevent the temperature of the hydraulic oil in the energy recovery circuit from increasing due to the back and forth flow between the energy accumulator, the hydraulic pipeline and the valve, which will affect the hydraulic components. The present application also provides a temperature control module. The purpose of the present application is achieved by the following technical solutions:

[0008] A boom independent drive type hydraulic excavator boom potential energy recovery system, characterized in that it comprises a main oil circuit module, a transmission module, an energy supply module, a three-cavity hydraulic cylinder energy recovery module, a flow regenerative energy recovery module and a temperature control module.

[0009] In the above scheme, the main oil circuit module is composed of a main hydraulic pump, a cooler, an oil tank, a flow regeneration reversing valve, a rodless cavity reversing valve, a three-cavity hydraulic cylinder, an oil supplement reversing valve and a one-way valve, which can supply energy to the whole hydraulic system and supplement the energy storage cavity of the three-cavity hydraulic cylinder; one end of the flow regeneration reversing valve is connected with the rod cavity and the oil tank of the three-cavity hydraulic cylinder, and the other end is connected with the main hydraulic pump and the cooler, the cooler is connected with the oil tank, the other end of the main hydraulic pump is connected with the rodless cavity reversing valve and the oil supplement reversing valve, and the rodless cavity reversing valve and the oil supplement reversing valve are connected with the rodless cavity and the energy storage cavity of the three-cavity hydraulic cylinder respectively; the transmission module is composed of a secondary hydraulic pump connecting gear, a motor connecting gear, a center wheel, a motor clutch and a secondary hydraulic pump clutch, the secondary hydraulic pump connecting gear and the motor connecting gear are engaged with the inner gear ring of the center wheel, the motor connecting gear is connected with the motor clutch through a connecting shaft, and the secondary hydraulic pump connecting gear is connected with the secondary hydraulic pump clutch through a connecting shaft, which is used to realize the connection and disconnection between the secondary hydraulic pump and the motor and the main hydraulic pump; the energy supply module is composed of a power supply and a motor, which provides power source for the system; the three-cavity hydraulic cylinder energy recovery module is composed of a three-cavity hydraulic cylinder energy storage reversing valve and an energy storage device 1, one end of the three-cavity hydraulic cylinder energy storage reversing valve is connected with the energy storage device 1, and the other end is connected with the energy storage cavity of the three-cavity hydraulic cylinder; the flow regeneration energy recovery module is composed of a secondary hydraulic pump, a flow regeneration energy storage reversing valve and an energy storage device 2, one end of the flow regeneration energy storage reversing valve is connected with the energy storage device 2, and the other end is connected with the secondary hydraulic pump, and the secondary hydraulic pump is connected with the oil tank and the transmission module respectively; the three-cavity hydraulic cylinder energy recovery module and the flow regeneration energy recovery module are used to recover the gravitational potential energy in the process of lowering the boom, and to supply energy for the next boom lifting.

[0010] In the above scheme of the main oil circuit module, the flow regeneration reversing valve is a two-position six-way reversing valve, when the flow regeneration reversing valve is in the left position, the main oil circuit system is a closed system, the rodless cavity of the three-cavity hydraulic cylinder is connected with the rod cavity to realize flow regeneration, at this time the boom is lowered; when the flow regeneration reversing valve is in the right position, the main oil circuit system is an open system, under the action of the main hydraulic pump, the hydraulic oil is delivered to the rodless cavity of the three-cavity hydraulic cylinder, the rod cavity of the three-cavity hydraulic cylinder is connected with the cooler, and the hydraulic oil is delivered back to the oil tank after being cooled, at this time the boom is lifted.

[0011] In the above scheme of the transmission module, the center wheel is connected with the main hydraulic pump through a connecting shaft, and is engaged with the secondary hydraulic pump connecting gear and the motor connecting gear, the secondary hydraulic pump connecting gear is connected with the secondary hydraulic pump through a clutch, and the motor connecting gear is connected with the motor through a clutch, which can realize that the secondary hydraulic pump and the motor jointly drive the main hydraulic pump when supplying energy, disconnect the motor and the main hydraulic pump when storing energy, and connect the main hydraulic pump and the secondary hydraulic pump to store energy.

[0012] In the above scheme of the energy supply module, the energy source is a power supply and is detachable, which is convenient for backup and replacement; at the same time, a cable is provided for cable use.

[0013] In the three-cavity hydraulic cylinder energy recovery module scheme, when the boom is lowered, the hydraulic oil in the energy storage cavity of the three-cavity hydraulic cylinder enters the energy accumulator 1, and the gravitational potential energy of the boom is stored in the form of hydraulic oil pressure, and is released when the boom is raised later.

[0014] In the flow regeneration energy recovery module scheme, during the boom lowering process, the hydraulic oil drives the main hydraulic pump to rotate, and drives the auxiliary hydraulic pump through the transmission module, and the gravitational potential energy of the boom is stored in the energy accumulator 2 in the form of hydraulic oil pressure, and when the boom is raised later, the hydraulic oil in the energy accumulator 2 drives the auxiliary hydraulic pump to rotate, and the main hydraulic pump is driven by the transmission module and the motor.

[0015] In the temperature control module scheme, the temperature control module is composed of a temperature sensor, a temperature control system and a display and warning device.

[0016] Further, the temperature sensor 1 is arranged at the oil inlet of the energy accumulator 1, and the temperature sensor 2 is arranged at the oil inlet of the energy accumulator 2, which is used to detect the temperature change of the hydraulic oil in each energy recovery circuit and transmit it to the temperature control system, and the temperature control system receives the temperature signal from the sensor and outputs it to the display and warning device to display the temperature of the hydraulic oil, and at the same time, when the temperature reaches a certain threshold value, the warning is given; the temperature control system also includes a set of control logic for controlling the three-cavity hydraulic cylinder energy storage reversing valve and the flow regeneration energy storage reversing valve to reverse, so that the high-temperature hydraulic oil returns to the tank for cooling, and the swash plate angle of the auxiliary hydraulic pump is controlled, and when the temperature is high, the displacement of the auxiliary hydraulic pump is reduced to reduce the hydraulic oil stored in the energy accumulator 2, and when the temperature is low, the displacement of the auxiliary hydraulic pump is increased to store more hydraulic oil in the energy accumulator 2.

[0017] The beneficial effects of the present application are:

[0018] 1. The boom independent driving type hydraulic excavator boom potential energy recovery system provided by the present application, in the main oil path module scheme, the flow regeneration reversing valve is a two-position six-way reversing valve, when the flow regeneration reversing valve is in the left position, the main oil path system is a closed system, when the flow regeneration reversing valve is in the right position, the main oil path system is an open system, so that the main oil path system has the characteristics of compact closed loop structure, and at the same time, when the flow regeneration reversing valve is in the right position, the tank supplies oil to the main oil path, and the hydraulic oil in the original pipeline is cooled by the cooler before returning to the tank, which can prevent high-temperature hydraulic oil in the pipeline from damaging the hydraulic system.

[0019] 2. The boom independent driving type hydraulic excavator boom potential energy recovery system provided by the present application, the system is provided with a flow regeneration energy recovery module on the flow regeneration circuit, and the transmission module composed of gear and clutch and other mechanical structures is adopted to store the gravitational potential energy of the boom into the energy accumulator 2, and the transmission module can provide the energy stored in the energy accumulator 2 to the main hydraulic pump, wherein the energy conversion form is less and the conversion efficiency is high.

[0020] 3. The boom independent driving type hydraulic excavator boom potential energy recovery system provided by the present application adopts a detachable power supply as the energy source in the power supply module scheme, facilitating replacement during use and providing a backup in a place without power supply; meanwhile, a cable is provided, which can be connected for use in a fixed place with power supply, and has higher endurance.

[0021] 4. The boom independent driving type hydraulic excavator boom potential energy recovery system provided by the present application, wherein the temperature control module can monitor the temperature of the hydraulic oil in each energy storage circuit, and when the temperature reaches a certain threshold value, an alarm is given, and meanwhile, the three-cavity hydraulic cylinder energy storage reversing valve and the flow regeneration energy storage reversing valve are controlled to reverse, so that the high-temperature hydraulic oil in the circuit is returned to the tank for cooling; and the swash plate angle of the auxiliary hydraulic pump is controlled, so that when the temperature is high, the displacement of the auxiliary hydraulic pump is reduced, and the hydraulic oil stored in the energy accumulator 2 is reduced, and when the temperature is low, the displacement of the auxiliary hydraulic pump is increased, so that the energy accumulator 2 stores more hydraulic oil, and the oil storage amount in the energy accumulator 2 is dynamically adapted according to the temperature change, so that energy is stored while preventing the temperature from being too high to affect the hydraulic components, and the module also improves the intelligent degree of the equipment and increases the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The drawings show the schematic diagrams of the modules of the boom independent driving type hydraulic excavator boom potential energy recovery system provided by the present application.

[0023] Figure 2 The drawings show the schematic diagrams of the modules of the boom independent driving type hydraulic excavator boom potential energy recovery system provided by the present application.

[0024] Figure 3 The drawings show the schematic diagrams of the modules of the boom independent driving type hydraulic excavator boom potential energy recovery system provided by the present application.

[0025] In the drawings, the meanings of the numbers and arrows are as follows:

[0026] 1 - main oil circuit module; 11 - main hydraulic pump; 12 - cooler; 13 - oil tank; 14 - flow regeneration reversing valve; 15 - rodless cavity reversing valve; 16 - three-cavity hydraulic cylinder; 161 - three-cavity hydraulic cylinder rodless cavity; 162 - three-cavity hydraulic cylinder rod cavity; 163 - three-cavity hydraulic cylinder energy storage cavity; 17 - oil supplement reversing valve; 18 - check valve; 2 - transmission module; 21 - auxiliary hydraulic pump connecting gear; 22 - motor connecting gear; 23 - center wheel; 24 - motor clutch; 25 - auxiliary hydraulic pump clutch; 3 - energy supply module; 31 - power supply; 32 - motor; 4 - three-cavity hydraulic cylinder energy recovery module; 41 - three-cavity hydraulic cylinder energy storage reversing valve; 42 - energy storage 1; 5 - flow regeneration energy recovery module; 51 - auxiliary hydraulic pump; 52 - flow regeneration energy storage reversing valve; 53 - energy storage 2; 6 - temperature control module; 61 - temperature sensor 1; 62 - temperature sensor 2; 63 - temperature control system; 64 - display and early warning device. Embodiment

[0027] The structure and working principle of the boom independent driving type hydraulic excavator boom potential energy recovery system described in the present application will be further described below by means of embodiments and in conjunction with the accompanying drawings.

[0028] In this embodiment, the schematic diagram of each module of the boom independent driving type hydraulic excavator boom potential energy recovery system is shown in Figure 1 It includes a main oil circuit module (1), a transmission module (2), an energy supply module (3), a three-cavity hydraulic cylinder energy recovery module (4), a flow regeneration energy recovery module (5), and a temperature control module (6).

[0029] Figure 2 The structural schematic diagram of the boom independent driving type hydraulic excavator boom potential energy recovery system is shown in the figure. Its structure includes: a main hydraulic pump (11), a cooler (12), an oil tank (13), a flow regeneration reversing valve (14), a rodless cavity reversing valve (15), a three-cavity hydraulic cylinder (16), a three-cavity hydraulic cylinder rodless cavity (161), a three-cavity hydraulic cylinder rod cavity (162), a three-cavity hydraulic cylinder energy storage cavity (163), an oil supplement reversing valve (17), a check valve (18), an auxiliary hydraulic pump connecting gear (21), a motor connecting gear (22), a center wheel (23), a motor clutch (24), an auxiliary hydraulic pump clutch (25), a power supply (31), a motor (32), a three-cavity hydraulic cylinder energy storage reversing valve (41), an energy storage 1 (42), an auxiliary hydraulic pump (51), a flow regeneration energy storage reversing valve (52), an energy storage 2 (53), a temperature sensor 1 (61), a temperature sensor 2 (62), a temperature control system (63), and a display and early warning device (64). Figure 3 The temperature control module schematic diagram of the boom independent driving type hydraulic excavator boom potential energy recovery system is shown.

[0030] Flow regeneration reversing valve (14) one end of three cavity hydraulic cylinder (16) and oil tank (13), the other end and main hydraulic pump (11) and cooler (12) are connected, cooler (12) is connected with oil tank (13) again, when flow regeneration reversing valve (14) is in left position, rodless cavity reversing valve (15) is in left position, three cavity hydraulic cylinder rodless cavity (161) is connected three cavity hydraulic cylinder rod cavity (162) and realizes flow regeneration, boom descends;When flow regeneration reversing valve (14) is in right position, rodless cavity reversing valve (15) is in left position, three cavity hydraulic cylinder rod cavity (162) is connected oil tank (13) through cooler (14), the high temperature hydraulic oil in oil circuit is cooled through cooler (12) and then is transported back to oil tank (13), main hydraulic pump (11) is connected with oil tank and three cavity hydraulic cylinder rodless cavity (161), three cavity hydraulic cylinder rodless cavity (161) is in oil, boom rises;Main hydraulic pump (11) is also connected with oil supplement reversing valve (17), oil supplement reversing valve (17) is connected with three cavity hydraulic cylinder energy storage cavity (163), and oil supplement reversing valve (17) is connected with three cavity hydraulic cylinder energy storage cavity (163) and supplements oil.

[0031] Sub hydraulic pump connecting gear (21) and motor connecting gear (22) are engaged with center wheel (23), the output end of center wheel (23) is connected with main hydraulic pump (11), sub hydraulic pump connecting gear (21) is connected with sub hydraulic pump (51) through sub hydraulic pump clutch (25), motor connecting gear (22) is connected with motor (32) through motor clutch (24), and the transmission module is used to realize the connection and disconnection between motor (32) and sub hydraulic pump (51) and main hydraulic pump (11).

[0032] Motor (32) is connected with power supply (31) and transmission module (2) respectively, wherein the power supply (31) is detachable, which facilitates replacement during use and provides backup in places without power supply;At the same time, it is equipped with a cable, which can be used in fixed places with power supply, and has higher endurance.

[0033] Three cavity hydraulic cylinder energy storage reversing valve (41) one end is connected with three cavity hydraulic cylinder energy storage cavity (163), the other end is connected with energy accumulator 1 (42), boom descends stage, three cavity hydraulic cylinder energy storage reversing valve (41) is in left position, three cavity hydraulic cylinder energy storage cavity (163) hydraulic oil is pressed into energy accumulator 1 (42) and stores energy, and in boom ascending stage, hydraulic oil in energy accumulator 1 (42) is released, which drives boom to rise.

[0034] Flow regeneration energy storage reversing valve (52) one end and energy storage 2 (53) are connected, the other end is connected with auxiliary hydraulic pump (51), auxiliary hydraulic pump (51) is connected with oil tank and transmission module (2) respectively, boom lowering stage, flow regeneration energy storage reversing valve (52) is in left position, energy storage 2 (53) is communicated with auxiliary hydraulic pump (51), auxiliary hydraulic pump (51) is connected with transmission module (2) by auxiliary hydraulic pump clutch (25), at this time, motor (32) is disconnected with transmission module (2) by motor clutch (24), due to boom gravity, no rod cavity oil is extruded and drives main hydraulic pump (11) rotation, drives auxiliary hydraulic pump (51) to supplement oil in energy storage 2 (53) by transmission module (2), converts gravitational potential energy into hydraulic oil pressure and stores up.In the subsequent boom rising, flow regeneration energy storage reversing valve (52) is in left position, energy storage 2 (53) is communicated with auxiliary hydraulic pump (51), auxiliary hydraulic pump (51) and motor (32) are connected with transmission module (2) by clutch respectively, hydraulic oil in energy storage 2 (53) drives auxiliary hydraulic pump (51) and motor (32) to drive main hydraulic pump (11) to supply oil for system.

[0035] Temperature sensor 1 (61) is arranged in energy storage 1 (42) oil inlet, temperature sensor 2 (62) is arranged in energy storage 2 (53) oil inlet, to detect the temperature change of hydraulic oil in each energy recovery oil circuit and transmit to temperature control system (63), while the output end of temperature control system (63) is connected with display and early warning device (64), three-cavity hydraulic cylinder energy storage reversing valve (41), flow regeneration energy storage reversing valve (52) and auxiliary hydraulic pump (51), to display the temperature of hydraulic oil in energy recovery circuit, and provide high temperature alarm function, while controlling three-cavity hydraulic cylinder energy storage reversing valve (41) and flow regeneration energy storage reversing valve (52) to reverse, return the high temperature hydraulic oil in circuit to oil tank to cool, and by controlling the swash plate angle of auxiliary hydraulic pump (51), when the temperature is high, reduce the displacement of auxiliary hydraulic pump, reduce the hydraulic oil stored in energy storage 2 (53), when the temperature is low, increase the displacement of auxiliary hydraulic pump (51), so that energy storage 2 (53) stores more hydraulic oil, and the oil storage capacity in energy storage 2 (53) is dynamically adapted according to the temperature change.

[0036] The above only describes the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic excavator boom potential energy recovery system with independent boom actuation, characterized by: The application relates to a hydraulic system for a hydraulic excavator, which comprises a main oil path module (1), a transmission module (2), an energy supply module (3), a three-cavity hydraulic cylinder energy recovery module (4), a flow regeneration energy recovery module (5) and a temperature control module (6). The main oil path module (1) is composed of a main hydraulic pump (11), a cooler (12), an oil tank (13), a flow regeneration reversing valve (14), a rodless cavity reversing valve (15), a three-cavity hydraulic cylinder (16), an oil supplement reversing valve (17) and a check valve (18). One end of the flow regeneration reversing valve (14) is connected with the three-cavity hydraulic cylinder (16) and the oil tank (13), the other end is connected with the main hydraulic pump (11) and the cooler (12), the cooler (12) is connected with the oil tank (13), the other end of the main hydraulic pump (11) is connected with the rodless cavity reversing valve (15) and the oil supplement reversing valve (17), the rodless cavity reversing valve (15) is connected with a rodless cavity (161) of the three-cavity hydraulic cylinder, and the oil supplement reversing valve (17) is connected with an energy storage cavity (163) of the three-cavity hydraulic cylinder through the check valve (18). The transmission module (2) is composed of a secondary hydraulic pump connecting gear (21), a motor connecting gear (22), a central wheel (23), a motor clutch (24) and a secondary hydraulic pump clutch (25). The secondary hydraulic pump connecting gear (21) and the motor connecting gear (22) are meshed with an inner gear ring of the central wheel (23), the output end of the central wheel (23) is connected with the main hydraulic pump (11), the motor connecting gear (22) is connected with the motor clutch (24), and the secondary hydraulic pump connecting gear (21) is connected with the secondary hydraulic pump clutch (25). The energy supply module (3) is composed of a power supply (31) and a motor (32), and the motor (32) is connected with the power supply (31) and the transmission module (2) respectively. The three-cavity hydraulic cylinder energy recovery module (4) is composed of a three-cavity hydraulic cylinder energy storage reversing valve (41) and a first energy storage device (42). One end of the three-cavity hydraulic cylinder energy storage reversing valve (41) is connected with the energy storage cavity (163) of the three-cavity hydraulic cylinder, and the other end is connected with the first energy storage device (42). The flow regeneration energy recovery module (5) is composed of a secondary hydraulic pump (51), a flow regeneration energy storage reversing valve (52) and a second energy storage device (53). One end of the flow regeneration energy storage reversing valve (52) is connected with the second energy storage device (53), the other end is connected with the secondary hydraulic pump (51), and the secondary hydraulic pump (51) is connected with the oil tank and the transmission module (2) respectively. The flow regeneration reversing valve (14) is a two-position six-way reversing valve. When the flow regeneration reversing valve (14) is in the left position and the rodless cavity reversing valve (15) is in the left position, the rodless cavity (161) of the three-cavity hydraulic cylinder is connected with the rod cavity (162) of the three-cavity hydraulic cylinder to realize flow regeneration and realize boom lowering.When the flow regeneration reversing valve (14) is in the right position, and the rodless cavity reversing valve (15) is in the left position, the three-cavity hydraulic cylinder rod cavity (162) is connected to the oil tank (13) through the cooler (12), and the high-temperature hydraulic oil in the oil circuit is cooled by the cooler (12) before being transported back to the oil tank (13). The main hydraulic pump (11) is connected to the oil tank (13) and the three-cavity hydraulic cylinder rodless cavity (161), the three-cavity hydraulic cylinder rodless cavity (161) is filled with oil, and the boom is raised.

2. A boom independent drive hydraulic excavator boom potential energy recovery system in accordance with claim 1, wherein The transmission module (2) is connected with the auxiliary hydraulic pump (51) and the auxiliary hydraulic pump clutch (25), and the motor (32) is connected with the motor clutch (24).

3. The hydraulic excavator boom potential energy recovery system of claim 1, wherein The temperature control module (6) is composed of a first temperature sensor (61), a second temperature sensor (62), a temperature control system (63) and a display and early warning device (64).

4. The boom independent drive type hydraulic excavator boom potential energy recovery system according to claim 3, further comprising that the first temperature sensor (61) is arranged at the oil inlet of the first energy accumulator (42), and the second temperature sensor (62) is arranged at the oil inlet of the second energy accumulator (53), so as to detect the temperature change of the hydraulic oil in each energy recovery circuit and transmit to the temperature control system (63).

5. The boom independent drive type hydraulic excavator boom potential energy recovery system according to claim 3, further comprising that the temperature control system (63) is provided with a set of control logic, which is used to control the switching of the three-cavity hydraulic cylinder energy storage reversing valve (41) and the flow regeneration energy storage reversing valve (52) and the displacement size of the auxiliary hydraulic pump (51).

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