Engineering machinery energy recovery system test platform based on dual-mode energy accumulator

Abstract

The utility model relates to an engineering machinery energy recovery system test platform based on a dual-mode energy accumulator, which comprises a winch, a hydraulic energy accumulator, a hydraulic pump / motor, a flow control valve and a hydraulic pump station, the winch is connected with the hydraulic pump / motor, the hydraulic energy accumulator is connected with a pressure gauge and a stop valve, and the hydraulic pump station is provided with a filter. The lifting support is located below the winch, and the weight is located below the lifting support. In the energy storage link, a hydraulic pump station provides power for a hydraulic pump / motor, a winch is driven to output, a heavy object is lifted through a lifting support, gravitational potential energy is obtained for the heavy object, and then the heavy object is lowered to drive the hydraulic pump / motor to rotate reversely to store energy for an energy accumulator. In the energy releasing link, the hydraulic pump station stores energy for the hydraulic energy accumulator, then the hydraulic energy accumulator drives the hydraulic pump / motor to provide power, and the winch is driven to output to lift a heavy object. The device provides a scientific basis for design and application of energy recovery of engineering machinery, and has remarkable application value and social and economic benefits.

Description

TECHNICAL FIELD

[0001] The utility model relates to the use of energy accumulator in construction machinery energy recovery, in particular to a kind of construction machinery energy recovery system test platform based on dual-mode energy accumulator. BACKGROUND

[0002] Hydraulic accumulator is a kind of energy storage device in hydraulic system, store hydraulic pressure in pressure vessel, when needed, the energy storage device that it releases again.The developed skin bag type air accumulator is a kind of device for accumulating hydraulic oil.Skin bag type accumulator is composed of oil part and gas part with air-tight seal, oil around skin bag is connected with oil circuit.When pressure rises, oil enters accumulator, gas is compressed;When pipeline pressure drops, compressed air expands, and oil is pressed into circuit.Gas and oil in skin bag type accumulator are separated by skin bag.

[0003] Construction machinery energy recovery technology originated in the late 20th century, aiming to solve the problem of low energy utilization rate (generally less than 30%) of traditional hydraulic system. Traditionally, construction machinery mainly relies on engine and hydraulic system, with low energy efficiency and serious waste. Early energy recovery may use mechanical flywheel or hydraulic accumulator, but the efficiency is not high and the applicability is limited. The technologies used in history include single hydraulic accumulator or mechanical energy storage. These technologies have low energy density, slow response speed, and cannot adapt to different working conditions, making it difficult to effectively utilize the recovered energy. In addition, the test platform may not be flexible enough to simulate real working conditions, resulting in inaccurate test results.

[0004] At present, patent CN109083798A provides a kind of hydraulic energy recovery system based on energy accumulator, the patent proposes a kind of hydraulic energy recovery system based on energy accumulator, through hydraulic pump / motor the potential energy of heavy object lowering is converted into hydraulic energy and stored to energy accumulator, and releases energy accumulator energy to assist driving hydraulic cylinder when lifting. Energy accumulator is only used as auxiliary power source, cannot independently drive load, still needs to rely on external hydraulic pump power supply. Energy charging mode and energy releasing mode need to be switched by valve, and the pressure reconstruction process leads to energy loss (about 15-20%). SUMMARY

[0005] The utility model aims at providing a kind of construction machinery energy recovery system test platform based on dual-mode energy accumulator with simple operation and lower cost, to solve the problems of high cost, large prediction error and poor universality of different construction machinery of existing construction machinery energy recovery test platform scheme.

[0006] The utility model provides a kind of engineering machinery energy recovery system test platform based on dual-mode energy accumulator, comprising: control console, winch, hydraulic accumulator, hydraulic pump / motor, flow control valve, control console, hydraulic pump station and lifting support, wherein: stop valve is four, first, second and fourth stop valve are fixed on control console, third stop valve is fixed on hydraulic pump station, winch connects hydraulic pump / motor, one end of hydraulic accumulator connects pressure gauge, the other end connects first stop valve, filter is equipped on hydraulic pump station, filter is sequentially connected hydraulic pump / motor by third stop valve, fourth stop valve and flow control valve, lifting support is located below winch, weight is located below lifting support;In energy storage link, winch is driven by the power provided by hydraulic pump station for hydraulic pump / motor output, weight is lifted by lifting support, and gravitational potential energy is obtained for weight, then weight is lowered, drives hydraulic pump / motor to reverse for hydraulic accumulator energy storage;In energy release link, hydraulic accumulator is energized by hydraulic pump station, then hydraulic pump / motor is driven by hydraulic accumulator to provide power, and winch output drives weight lifting.

[0007] In the utility model, in energy storage link, the gravitational potential energy of weight is converted into hydraulic energy and stored in hydraulic accumulator by hydraulic accumulator;In energy release link, the hydraulic energy in hydraulic accumulator is used as power source to lift weight.

[0008] In the utility model, in energy storage link, weight is lifted as motor by hydraulic pump / motor, then the gravitational potential energy of weight is converted into hydraulic energy as pump;In energy release link, weight is lifted as motor.

[0009] In the utility model, in energy storage link, weight is lifted as motor by hydraulic pump / motor, then the gravitational potential energy of weight is converted into hydraulic energy as pump;In energy release link, weight is lifted as motor.

[0010] In the utility model, there is one flow control valve, which limits the maximum flow to prevent hydraulic pump / motor from being damaged due to overspeed or overload.

[0011] In the utility model, there are four stop valves, one of which is located on the hydraulic pump station, and the other three are fixed on the hydraulic control console, which prevents oil backflow in the hydraulic circuit and prevents the weight from suddenly falling due to gravity when lifting the weight.

[0012] In the utility model, in energy storage link, hydraulic pump station drives hydraulic pump / motor to lift weight;In energy release link, hydraulic pump station charges energy accumulator.

[0013] In the utility model, lifting rack is used to lift weight by winch output.

[0014] The utility model has the advantages that:

[0015] 1. Integrated dual mode: The utility model integrates energy storage test and energy release test in one, without physical modification system to carry out dual mode test. This can verify the energy "recycling-storage-reuse" closed loop performance, and provide full cycle test support for the development of energy saving control system of engineering machinery (such as excavator boom, crane hoist);

[0016] 2. Energy output diversity: The utility model supports three energy distribution strategies of energy storage alone, main pump alone and mixed energy supply, to verify the system efficiency under different working conditions;

[0017] 3. Extended working condition applicability: The utility model considers different engineering machinery under different loads, such as the transient pressure impact absorption capacity of the accumulator when the engineering machinery stops suddenly, and the energy absorption rate of the excavator when it rotates;

[0018] 4. The utility model can obtain more accurate engineering machinery energy recovery rate data, and the use unit can effectively plan the engineering machinery energy recovery and energy output, improve the energy utilization efficiency of engineering machinery, and avoid energy waste.

[0019] In summary, the utility model not only integrates the energy storage and energy release links of engineering machinery energy recovery, but also verifies different energy output methods and engineering machinery energy recovery under various working conditions, provides scientific basis for the design and application of engineering machinery energy recovery, and has remarkable application value and social and economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The utility model is a structural diagram.

[0021] The figure mark: 1 is hydraulic pump / motor, 2 is flow control valve, 3 is fourth stop valve, 4 is third stop valve, 5 is overflow valve, 6 is filter, 7 is hydraulic pump station, 8 is hydraulic accumulator, 9 is hoist, 10 is pressure gauge, 11 is lifting support, 12 is first stop valve, 13 is second stop valve, 14 is control console. DETAILED DESCRIPTION

[0022] The utility model will be further illustrated by examples in combination with the drawings.

[0023] Example 1: A dual-mode accumulator-based construction machinery energy recovery system test platform, comprising: a control console 14, a winch 9, a hydraulic accumulator 8 (model NXQA-10 / 31.5-L), a hydraulic pump / motor 1 (model YF A2F23W2P1), a flow control valve 2 (model LFR-10-2C), four shut-off valves (model LSV6-08-2NCSP), a hydraulic pump station 7 (model TX04-80), and a lifting support. The first, second, and fourth shut-off valves are fixed to the control console, the third shut-off valve 4 is fixed to the hydraulic pump station, the winch 9 is connected to the hydraulic pump / motor 1, one end of the hydraulic accumulator 8 is connected to a pressure gauge 10, and the other end is connected to the first shut-off valve 13, the hydraulic pump station 7 is provided with a filter 6, the filter 6 is connected to the hydraulic pump / motor 1 in sequence through the third shut-off valve 4, the fourth shut-off valve 3, and the flow control valve 2, the hydraulic pump / motor 1 is connected to the winch 9, and the lifting support 11 is located below the winch 9.

[0024] The working process of this embodiment is as follows:

[0025] As shown in Figure 1 , the core device of the test platform is the hydraulic accumulator 8, which is used to store the recovered energy, the winch 9 is driven by the hydraulic pump / motor 1 to simulate the construction machinery, and the final hydraulic pump station 7 is the output source of the construction machinery and the hydraulic accumulator 8. In the energy storage test, the hydraulic pump station 7 is used to drive the hydraulic pump / motor 1 (as a motor to lift the weight, then lower the weight, and convert the gravitational potential energy of the weight into hydraulic energy by the hydraulic pump / motor (as a pump) to store in the hydraulic accumulator 8; in the energy release test, the hydraulic pump station 7 is used to charge the hydraulic accumulator 8, and then the hydraulic accumulator 8 is used to drive the hydraulic pump / motor 1 (as a motor) to lift the weight, and convert the hydraulic energy into the gravitational potential energy of the weight.

[0026] The specific steps of the experiment described in this embodiment are as follows:

[0027] (1) Test preparation: confirm that the hydraulic pump station 7, the hydraulic pump / motor 1, the hydraulic accumulator 8, the flow control valve 2, the shut-off valve, the pressure gauge 10, the lifting support 11, and other equipment are in good condition;

[0028] (2) Connect the pipeline: build the test platform according to Figure 1 structure;

[0029] (3) Parameter presetting: set the output pressure of the hydraulic pump station 7 to 10 MPa, the upper limit of the hydraulic accumulator 8 to 15 MPa, and the threshold of the overflow valve;

[0030] (4) System pre-operation: start the hydraulic pump station 7 for 5 minutes under no load, and check whether the pipeline is leaking and whether there is abnormal noise;

[0031] (5) Hydraulic pump / motor check: switch the hydraulic pump / motor 1 usage mode, verify the hydraulic pump / motor 1 normal forward and reverse rotation;

[0032] (6) Hydraulic accumulator 8 inflation: the hydraulic accumulator 8 pre-charged nitrogen to the initial pressure 5 MPa;

[0033] (7) Energy storage test:

[0034] Energy storage preparation: switch the hydraulic pump / motor 1 usage mode, make the hydraulic pump station 7 drive the hydraulic pump / motor 1 forward rotation, slowly lift the weight to the set height;

[0035] Weight down energy storage: switch the hydraulic pump / motor 1 usage mode, make the hydraulic pump / motor 1 as pump mode, the weight under the action of gravity down;

[0036] Data recording and reset: record the energy storage time, accumulator pressure change, weight displacement, flowmeter volume, then the pump station shutdown;

[0037] (8) Energy storage test:

[0038] Energy storage preparation: switch the hydraulic pump / motor 1 usage mode, make the hydraulic pump station 7 drive the hydraulic pump / motor 1 forward rotation, slowly lift the weight to the set height;

[0039] Weight down energy storage: switch the hydraulic pump / motor 1 usage mode, make the hydraulic pump / motor 1 as pump mode, the weight under the action of gravity down;

[0040] Data recording and reset: record the energy storage time, accumulator pressure change, weight displacement, flowmeter volume, then the pump station shutdown.

Claims

1. A dual mode accumulator based construction machine energy recovery system test platform comprising: The console, winch, hydraulic accumulator, hydraulic pump / motor, flow control valve, console, hydraulic pump station and lifting support are characterized in that: the stop valves are four, the first, second and fourth stop valves are fixed on the console, the third stop valve is fixed on the hydraulic pump station, the winch is connected with the hydraulic pump / motor, one end of the hydraulic accumulator is connected with the pressure gauge, the other end is connected with the first stop valve, the hydraulic pump station is provided with a filter, the filter is connected with the hydraulic pump / motor through the third stop valve, the fourth stop valve and the flow control valve in sequence, the lifting support is located below the winch, and the weight is located below the lifting support; in the energy storage link, the hydraulic pump station drives the winch to output by providing power for the hydraulic pump / motor, the weight is lifted by the lifting support, the gravitational potential energy of the weight is obtained, then the weight is lowered to drive the hydraulic pump / motor to reverse to store energy for the hydraulic accumulator; in the energy release link, the hydraulic accumulator is energized by the hydraulic pump station, then the hydraulic pump / motor is driven by the hydraulic accumulator to provide power, the winch is driven to output to lift the weight.

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