A hydraulic system of a drum loading energy recovery test device

Abstract

The application provides a kind of hydraulic system of drum loading energy recovery test device, constant pressure variable pump and radiator are connected with hydraulic oil tank, constant pressure variable pump is connected with single-acting spring return piston cylinder and second gearbox respectively, single-acting spring return piston cylinder is connected with pressure cut valve, pressure cut valve is connected with constant pressure variable pump, pressure reducing valve is connected with constant pressure variable pump and pressure cut valve, variable motor displacement adjusting valve is connected with pressure reducing valve and variable motor displacement adjusting cylinder respectively, adjusting rod is connected with variable motor displacement adjusting valve and variable motor displacement adjusting cylinder respectively, variable motor is connected with variable motor displacement adjusting cylinder and first gearbox respectively, variable motor is connected with constant pressure variable pump, pressure cut valve, radiator fan motor and radiator respectively, radiator fan is connected with radiator fan motor, harvester power input is connected with first gearbox, drum is connected with first gearbox and second gearbox respectively.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drum loading test, in particular to a hydraulic system of a drum loading energy recovery test device. BACKGROUND

[0002] The drum loading test of the harvester mainly tests the loading of different power under various drum rotating speeds to simulate the reaction force of various crops on the drum in the cleaning and threshing process. At present, these tests are mainly carried out by air running or actual field harvesting, and individual enterprises have developed special motor loading racks and hydraulic loading racks.

[0003] When air running, the load is much smaller than the actual load, and problems cannot be effectively found in advance.

[0004] Field tests are greatly affected by the maturity season of crops and the regional distribution of crops. In order to test, the crops must be mature, and the test must be carried out in the planting area. In addition, the test is greatly affected by the weather. If it rains, the harvesting test cannot be carried out. Generally, the dew is heavy at night, and harvesting cannot be carried out. The test cycle is long, which leads to slow progress of research and development.

[0005] Motor loading and hydraulic loading have become a trend, that is, the load can be applied to the drum, and it is not affected by the maturity season of crops and the regional distribution of crops, and the loading test can be carried out at any time.

[0006] One is motor loading, which is generally used in the laboratory and can partially recover energy. In this loading method, energy is provided by the driving motor to provide power for the drum. The loading motor generates electric energy which is converted into driving motor through rectifier equipment to achieve energy recovery.

[0007] The other is traditional hydraulic loading, which can be used in the laboratory or directly on the harvester. In this loading method, power is generally provided by the motor or the harvester directly provides power. The loading pump and overflow valve are used to load the drum, and the energy of the load is finally converted into heat energy.

[0008] 1) The motor loading can only be carried out in the laboratory and cannot be placed on the whole vehicle for test with other components.

[0009] 2) The motor loading needs rectifier equipment to recover electric energy, which is expensive and occupies a large area, and has certain requirements for the area of the laboratory.

[0010] 3) The energy of the traditional hydraulic loading cannot be recovered, and the test consumes a lot of energy. A large amount of diesel oil is consumed during the test, and the test cost is huge.

[0011] 4) Traditional hydraulic loading converts all loading energy into heat energy, resulting in a large demand for heat dissipation, especially during summer tests when the heat dissipation pressure is high. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide a hydraulic system for a roller loading energy recovery test device, which addresses the shortcomings of the prior art.

[0013] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A hydraulic system for a drum-loaded energy recovery test device includes: a hydraulic oil tank, a constant-pressure variable pump, a single-acting spring-return piston cylinder, a pressure shut-off valve, a pressure reducing valve, a variable motor displacement regulating valve, a variable motor displacement regulating cylinder, an adjusting rod, a variable motor, a radiator fan motor, a radiator fan, a radiator, a harvester power input, a first gearbox, a drum, and a second gearbox. The constant-pressure variable pump and the radiator are both connected to the hydraulic oil tank through pipelines. The constant-pressure variable pump is connected to the single-acting spring-return piston cylinder and the second gearbox respectively. The single-acting spring-return piston cylinder is connected to the pressure shut-off valve through a pipeline. The pressure shut-off valve is connected to the constant-pressure variable pump through a pipeline. The pump is connected to the constant pressure variable pump and the pressure shut-off valve via pipelines. The variable motor displacement regulating valve is connected to the pressure reducing valve and the variable motor displacement regulating cylinder via pipelines. The regulating rod is connected to the variable motor displacement regulating valve and the variable motor displacement regulating cylinder. The variable motor is connected to the variable motor displacement regulating cylinder and the first gearbox. The variable motor is connected to the constant pressure variable pump, the pressure shut-off valve, the radiator fan motor, and the radiator via pipelines. The radiator fan is connected to the radiator fan motor. The harvester power input is connected to the first gearbox. The drum is connected to the first gearbox and the second gearbox.

[0014] The beneficial effects of adopting the technical solution of this invention are as follows: The roller is loaded via a hydraulic system, enabling adjustable loading to simulate various crop harvesting conditions. It can be used on a harvester and tested in conjunction with other harvester components. Most of the loading energy can be recovered for cyclic loading, significantly reducing energy consumption and thus greatly reducing testing costs. Energy consumption is relatively low; the heat generated by the hydraulic system is only about one-third that of traditional hydraulic loading, greatly reducing the system's heat dissipation pressure. Energy recovery is achieved through a variable displacement motor and a first gearbox. By adjusting the displacement of the variable displacement motor, the energy recovery ratio can be adjusted; the larger the displacement of the variable displacement motor, the greater the energy recovery ratio.

[0015] Further, a first pressure sensor is arranged on the pipeline between the pressure reducing valve and the constant pressure variable pump, a second pressure sensor is arranged on the pipeline between the variable motor and the constant pressure variable pump, a third pressure sensor and a first temperature sensor are arranged on the pipeline between the radiator fan motor and the radiator, and a second temperature sensor is arranged on the pipeline between the radiator and the hydraulic oil tank.

[0016] The beneficial effects of the above further technical solutions are that the first pressure sensor is connected with the constant pressure variable pump and the high pressure filter, and serves to display the output pressure of the constant pressure variable pump. The second pressure sensor is used before the radiator fan motor, and serves to display the pressure of the oil before flowing through the radiator fan motor. The third pressure sensor is used after the radiator fan motor, and serves to display the pressure of the oil after flowing through the radiator fan motor, and by comparing the pressures displayed by the second and third pressure sensors, it is determined whether the pressure difference before and after the radiator fan motor meets the requirements. The first temperature sensor is used before the radiator, and serves to display the temperature of the oil before flowing through the radiator. The second temperature sensor is used after the radiator, and serves to display the temperature of the oil after flowing through the radiator, and by comparing the temperatures displayed by the first and second temperature sensors, it is determined whether the cooling effect meets the requirements.

[0017] Further, a first flow sensor is arranged on the pipeline between the pressure reducing valve and the constant pressure variable pump, and a second flow sensor is arranged on the pipeline between the variable motor and the constant pressure variable pump.

[0018] The beneficial effects of the above further technical solutions are that the first flow sensor is connected with the high pressure filter, and measures the total oil flow output by the constant pressure variable pump. The second flow sensor is connected with the variable motor, and measures the oil flow through the variable motor.

[0019] Further, a constant pressure variable pump oil drain port is arranged on the constant pressure variable pump, the constant pressure variable pump oil drain port is connected with a first oil tank, a pressure reducing valve oil drain port is arranged on the pressure reducing valve, the pressure reducing valve oil drain port is connected with a second oil tank, a variable motor oil drain port is arranged on the variable motor, the variable motor oil drain port is connected with a third oil tank, and a radiator fan motor oil drain port is arranged on the radiator fan motor, the radiator fan motor oil drain port is connected with a fourth oil tank.

[0020] The beneficial effects of the further technical scheme are that the constant pressure variable pump is provided with a constant pressure variable pump oil outlet, which has two functions, one is to inject hydraulic oil before the constant pressure variable pump operates to lubricate the constant pressure variable pump, and the other is to cool the constant pressure variable pump; the constant pressure variable pump oil outlet is directly connected to the first oil tank and is not connected to other pipelines in parallel to the oil tank, which prevents the pressure of the oil discharge circuit from being too high, damages the sealing elements of the constant pressure variable pump, and causes the constant pressure variable pump to leak oil. The pressure reducing valve is connected to the high-pressure oil circuit and the variable motor displacement adjusting valve to provide hydraulic oil with reduced pressure for the downstream and to stabilize the oil pressure. The pressure reducing valve is provided with a pressure reducing valve oil outlet that is directly connected to the second oil tank. The variable motor is provided with a variable motor oil outlet that is directly connected to the third oil tank. The radiator fan motor provides power for the radiator fan. The radiator fan motor is provided with a radiator fan motor oil outlet that is directly connected to the fourth oil tank and is not connected to other pipelines in parallel to the oil tank, which prevents the pressure of the oil discharge circuit from being too high, damages the sealing elements of the radiator fan motor, and causes the radiator fan motor to leak oil.

[0021] Further, an oil suction filter is arranged on the pipeline between the constant pressure variable pump and the hydraulic oil tank, a high-pressure filter is arranged on the pipeline between the pressure reducing valve and the constant pressure variable pump, and an oil return filter is arranged on the pipeline between the radiator and the hydraulic oil tank.

[0022] The beneficial effects of the further technical scheme are that the oil suction filter is used to filter the oil from the oil tank to the constant pressure variable pump to ensure the cleanliness of the oil entering the constant pressure variable pump and prevent impurities or foreign matters from entering the constant pressure variable pump to damage the constant pressure variable pump and downstream components. The high-pressure filter is connected to the constant pressure variable pump and the downstream hydraulic system to filter impurities in the output oil of the constant pressure variable pump and output clean oil to the downstream hydraulic system. The oil return filter filters impurities in the hydraulic oil in the circuit.

[0023] Further, the constant pressure variable pump is provided with a constant pressure variable pump swash plate, the constant pressure variable pump swash plate is connected to the single-acting spring return piston cylinder, the variable motor is provided with a variable motor swash plate, and the variable motor swash plate is connected to the variable motor displacement adjusting cylinder.

[0024] The beneficial effects of the further technical scheme are that the single-acting spring return piston cylinder is connected to the pressure cut-off valve and the constant pressure variable pump swash plate to control the displacement of the constant pressure variable pump. The variable motor displacement adjusting cylinder is connected to the variable motor displacement adjusting valve, the adjusting rod, and the variable motor swash plate to push the variable motor swash plate, change the angle of the swash plate, and adjust the displacement of the variable motor.

[0025] Further, the variable motor displacement adjusting valve is a proportional valve, the radiator is arranged adjacent to the radiator fan, the radiator is provided with a bypass valve in parallel, and the opening pressure of the bypass valve is 5 Bar.

[0026] The beneficial effect of the further technical solution is that the variable motor displacement adjusting valve is connected with the pressure reducing valve, the variable motor displacement adjusting cylinder and the adjusting rod, the variable motor displacement adjusting valve is a proportional valve, and the motor displacement can be steplessly adjusted according to the input current.

[0027] Further, the variable motor is connected with a proportional overflow valve in parallel.

[0028] The beneficial effect of the further technical solution is that the loading pressure can be adjusted by adjusting the proportional overflow valve, and then the loading power is steplessly adjusted, and the loading pressure of the stepless adjusting system is adjusted.

[0029] Further, the first overflow valve is connected with the constant pressure variable pump at one end through a pipeline, and connected with the radiator at the other end through a pipeline.

[0030] The beneficial effect of the further technical solution is that the first overflow valve is connected with other circuits in parallel, and functions as a safety valve, and is used together with the pressure cut-off valve, and functions as double protection.

[0031] Further, the radiator fan motor is connected with a second overflow valve, a check valve and a throttle valve in parallel, and the two ends of the second overflow valve, the check valve and the throttle valve are connected with the two ends of the radiator fan motor in one-to-one correspondence.

[0032] The beneficial effect of the further technical solution is that the second overflow valve is used to limit the pressure difference between the two ends of the radiator fan motor, so that the rotation of the radiator fan motor is stable, the check valve and the throttle valve constitute a check throttle valve, when the loading is finished, the radiator fan motor will have inertia under the driving of the fan, and the check valve can be quickly opened to supply oil to the radiator fan motor, so that the impact on the radiator fan motor is reduced, and the radiator fan motor is protected, and the second overflow valve is used together to stabilize the pressure difference between the two ends of the radiator fan motor, so that the rotation of the radiator fan motor is stable, the throttle valve is connected with the radiator fan motor in parallel, and the flow of the throttle valve can be adjusted, so that the initial working flow required by the radiator fan motor can be adjusted, so that the purpose that the radiator fan motor does not work when the heat is small, and the radiator fan motor starts to work when the heat is large is achieved.

[0033] The advantages of the additional aspects of the application will be partially given in the following description, partially become obvious from the following description, or be understood by the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1The hydraulic system structure schematic diagram of the drum loading energy recovery test device provided by the embodiment of the present application is shown in figure 1.

[0035] Fig. 2 The hydraulic system structure schematic diagram of the drum loading energy recovery test device provided by the embodiment of the present application is shown in figure 2.

[0036] Fig. 3 The hydraulic system structure schematic diagram of the drum loading energy recovery test device provided by the embodiment of the present application is shown in figure 3.

[0037] BRIEF DESCRIPTION OF DRAWINGS 1, hydraulic oil tank; 2, oil suction filter; 3, constant pressure variable pump; 4, single-acting spring return piston cylinder; 5, pressure cut-off valve; 6, first pressure sensor; 7, high-pressure filter; 8, first flow sensor; 9, pressure reducing valve; 10, variable motor displacement adjusting valve; 11, variable motor displacement adjusting cylinder; 12, adjusting rod; 13, second flow sensor; 14, variable motor; 15, proportional relief valve; 16, first relief valve; 17, second relief valve; 18, check valve; 19, throttle valve; 20, second pressure sensor; 21, radiator fan motor; 22, radiator fan; 23, third pressure sensor; 24, first temperature sensor; 25, bypass valve; 26, radiator; 27, second temperature sensor; 28, oil return filter; 29, harvester power input; 30, first gearbox; 31, drum; 32, second gearbox; 3-1, constant pressure variable pump drain; 9-1, pressure reducing valve drain; 14-1, variable motor drain; 21-1, radiator fan motor drain; 1-1, fourth oil tank; 1-2, third oil tank; 1-3, second oil tank; 1-4, first oil tank. DETAILED DESCRIPTION

[0038] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0039] As Figs. 1-3As shown, the embodiment of the present application provides a hydraulic system of a roller loading energy recovery test device, comprising: a hydraulic oil tank 1, a constant pressure variable pump 3, a single-acting spring return piston cylinder 4, a pressure cut-off valve 5, a pressure reducing valve 9, a variable motor displacement adjusting valve 10, a variable motor displacement adjusting cylinder 11, an adjusting rod 12, a variable motor 14, a radiator fan motor 21, a radiator fan 22, a radiator 26, a harvester power input 29, a first gearbox 30, a roller 31, a second gearbox 32, the constant pressure variable pump 3 and the radiator 26 are connected with the hydraulic oil tank 1 through pipelines, the constant pressure variable pump 3 is connected with the single-acting spring return piston cylinder 4 and the second gearbox 32 respectively, the single-acting spring return piston cylinder 4 is connected with the pressure cut-off valve 5 through a pipeline, the pressure cut-off valve 5 is connected with the constant pressure variable pump 3 through a pipeline, the pressure reducing valve 9 is connected with the constant pressure variable pump 3 and the pressure cut-off valve 5 through a pipeline, the variable motor displacement adjusting valve 10 is connected with the pressure reducing valve 9 and the variable motor displacement adjusting cylinder 11 through pipelines respectively, the adjusting rod 12 is connected with the variable motor displacement adjusting valve 10 and the variable motor displacement adjusting cylinder 11 respectively, the variable motor 14 is connected with the variable motor displacement adjusting cylinder 11 and the first gearbox 30 respectively, the variable motor 14 is connected with the constant pressure variable pump 3, the pressure cut-off valve 5, the radiator fan motor 21 and the radiator 26 through pipelines respectively, the radiator fan 22 is connected with the radiator fan motor 21, the harvester power input 29 is connected with the first gearbox 30, and the roller 31 is connected with the first gearbox 30 and the second gearbox 32 respectively.

[0040] The beneficial effects of the technical scheme of the present application are: the roller is loaded by the hydraulic system, and various crop harvesting conditions can be simulated by adjusting the loading. The device can be used on the harvester to perform tests together with other components of the harvester. Most of the loading energy can be recovered for cyclic loading, which greatly reduces energy consumption and test costs. The energy consumption is relatively low, and the heat generated by the hydraulic system is only about one-third of that of the traditional hydraulic loading, which greatly reduces the heat dissipation pressure of the system. The energy recovery is realized by the variable motor and the first gearbox. By adjusting the displacement of the variable motor, the energy recovery ratio can be adjusted. The larger the displacement of the variable motor is, the larger the energy recovery ratio is.

[0041] The application provides a hydraulic system of a roller loading energy recovery test device, which can be a hydraulic control system of a harvester roller loading energy recovery test device, loads the roller through the hydraulic system and can realize adjustable loading to simulate various crop harvesting conditions.

[0042] The roller is loaded through a plunger pump with pressure cut-off (constant pressure variable pump, single-acting spring return piston cylinder and pressure cut-off valve), and energy recovery is realized through a variable motor and an HMT gearbox (first gearbox). The loading pressure can be adjusted through a proportional overflow valve, and then the loading power is infinitely adjusted. The energy recovery ratio can be adjusted by adjusting the displacement of the variable motor, and the larger the displacement of the variable motor, the larger the energy recovery ratio. Specifically,

[0043] The hydraulic oil tank 1 stores the hydraulic working medium required by the hydraulic system, dissipates heat, precipitates pollutants and the like.

[0044] The oil suction filter 2 is used for filtering oil liquid from the hydraulic oil tank 1 to the constant pressure variable pump 3, ensuring the cleanliness of the oil liquid entering the constant pressure variable pump 3 and preventing impurities or foreign matters from entering the constant pressure variable pump 3 to damage the constant pressure variable pump 3 and downstream components.

[0045] The constant pressure variable pump 3 is connected with the second gearbox 32 and rotates under the driving of the second gearbox 32 to load the second gearbox 32 and then load the roller 31 to be tested. Meanwhile, high-pressure oil liquid is output to the high-pressure filter 7. The constant pressure variable pump 3 is provided with a constant pressure variable pump oil drain port 3-1, which has two functions, one is to inject hydraulic oil before the constant pressure variable pump 3 operates to lubricate the constant pressure variable pump 3, and the other is to cool the constant pressure variable pump 3. The constant pressure variable pump oil drain port 3-1 is directly connected with the first oil tank 1-4 and is not connected with other pipelines in parallel to the oil tank, preventing the pressure of the oil drain circuit from being too high to damage the sealing elements of the constant pressure variable pump 3 and causing the constant pressure variable pump 3 to leak.

[0046] The single-acting spring return piston cylinder 4 is connected with the pressure cut-off valve 5 and the swash plate of the constant pressure variable pump 3 to control the displacement of the constant pressure variable pump 3.

[0047] The pressure cut-off valve 5 connects the outlet end of the constant pressure variable pump 3 and the single-acting spring return piston cylinder 4. When the pressure of the outlet end of the constant pressure variable pump 3 reaches the set pressure of the pressure cut-off valve 5, the pressure cut-off valve 5 is switched to the left position under the action of the hydraulic pressure, the high-pressure oil is connected with the rodless cavity of the single-acting spring return piston cylinder 4, the piston rod is pushed out, and the piston rod pushes the swash plate angle of the constant pressure variable pump 3 to 0 degrees, so that the displacement of the constant pressure variable pump 3 is zeroed, and the plunger pump no longer outputs flow.

[0048] The first pressure sensor 6 connects the constant pressure variable pump 3 and the high-pressure filter 7, and serves to display the output pressure of the constant pressure variable pump 3.

[0049] The high-pressure filter 7 connects the constant pressure variable pump 3 and the downstream hydraulic system, filters the impurities of the output oil of the constant pressure variable pump 3, and outputs clean oil to the downstream hydraulic system.

[0050] The first flow sensor 8 connects the high-pressure filter 7 and measures all the oil flow output by the constant pressure variable pump 3.

[0051] The pressure reducing valve 9 connects the high-pressure oil way and the variable motor displacement adjusting valve 10, provides reduced hydraulic oil for the downstream, and serves to stabilize the oil pressure. The pressure reducing valve is provided with a pressure reducing valve oil drain port 9-1, which is directly connected with the second oil tank 1-3.

[0052] The variable motor displacement adjusting valve 10 connects the pressure reducing valve 9, the variable motor displacement adjusting cylinder 11 and the adjusting rod 12. The valve is a proportional valve, which can steplessly adjust the motor displacement according to the input current.

[0053] The variable motor displacement adjusting cylinder 11 connects the variable motor displacement adjusting valve 10, the adjusting rod 12 and the swash plate of the variable motor 14, pushes the swash plate of the variable motor 14, changes the swash plate angle, and adjusts the variable motor displacement.

[0054] The adjusting rod 12 cooperates with the variable motor displacement adjusting valve 10 and the variable motor displacement adjusting cylinder 11 to adjust the variable motor displacement.

[0055] The second flow sensor 13 connects the variable motor 14 and measures the oil flow passing through the variable motor 14.

[0056] The variable motor 14 connects the HMT gearbox (the first gearbox) and provides power for the first gearbox, i.e. the recovered power. The variable motor 14 is provided with a variable motor oil drain port 14-1, which is directly connected with the third oil tank 1-2.

[0057] The proportional overflow valve 15 serves to steplessly adjust the system loading pressure.

[0058] The first overflow valve 16 is connected in parallel with other circuits and functions as a safety valve, which is used together with the pressure cut-off valve 5 and functions as double protection.

[0059] The second overflow valve 17 is used to limit the pressure difference between the two ends of the radiator fan motor 21, so that the radiator fan motor 21 rotates stably.

[0060] The check valve 18 and the throttle valve 19 constitute a check throttle valve. When the loading is finished, the radiator fan motor 21 will have inertia under the drive of the fan, so that the check valve 18 can be quickly opened to supply oil to the radiator fan motor 21, thereby reducing the impact and protecting the radiator fan motor 21. Together with the second overflow valve 17, the check valve 18 stabilizes the pressure difference between the two ends of the radiator fan motor 21, so that the radiator fan motor 21 rotates stably.

[0061] The throttle valve 19 is connected in parallel with the radiator fan motor 21. By adjusting the flow of the throttle valve 19, the initial working flow required by the radiator fan motor 21 can be adjusted, so that the radiator fan motor 21 does not work when the heat is low, and the radiator fan motor 21 starts to work when the heat is high.

[0062] The second pressure sensor 20 is used before the radiator fan motor 21 and functions to display the pressure of the oil before flowing through the radiator fan motor 21.

[0063] The radiator fan motor 21 provides power for the radiator fan 22. The radiator fan motor is provided with a radiator fan motor oil drain port 21-1, which directly returns to the fourth oil tank 1-1 and is not connected in parallel with other circuits to prevent the oil drain circuit pressure from being too high, damaging the sealing elements of the radiator fan motor 21, and causing the radiator fan motor 21 to leak oil.

[0064] The radiator fan 22 functions to accelerate the heat dissipation of the radiator 26.

[0065] The third pressure sensor 23 is used after the radiator fan motor 21 and functions to display the pressure of the oil after flowing through the radiator fan motor 21. By comparing the pressure displayed by the second pressure sensor 20, it is determined whether the pressure difference before and after the radiator fan motor 21 meets the requirements.

[0066] The first temperature sensor 24 is used before the radiator 26 and functions to display the temperature of the oil before flowing through the radiator 26.

[0067] The bypass valve 25 is set to open at a pressure of 5 Bar. When the inlet pressure of the radiator 26 exceeds 5 Bar, the bypass valve 25 opens, thereby protecting the radiator 26.

[0068] The radiator 26 functions to dissipate heat for the hydraulic system.

[0069] The second temperature sensor 27 is used after the radiator 26 to show the temperature of the oil after flowing through the radiator 26, and by comparing with the temperature shown by the first temperature sensor 24, it is determined whether the cooling effect meets the requirements.

[0070] The oil return filter 28 filters the impurities in the hydraulic oil in the circuit.

[0071] The harvester power input 29 is connected to the HMT gearbox (first gearbox) to serve as the initial power input and control the rotating speed.

[0072] The HMT gearbox (first gearbox) is connected to the harvester power input 29, the variable motor 14 and the roller 31, and receives the joint action of the harvester power input 29 and the variable motor 14 to output power to the roller 31.

[0073] The roller 31 is the test piece, which receives the power from the HMT gearbox (first gearbox) and outputs the power to the constant pressure variable pump 3 through the second gearbox 32.

[0074] The second gearbox 32 is connected to the roller 31 and the constant pressure variable pump 3, and loads the roller 31 through the constant pressure variable pump 3.

[0075] As shown in Figs. 1-3 Further, a first pressure sensor 6 is arranged on the pipeline between the pressure reducing valve 9 and the constant pressure variable pump 3, a second pressure sensor 20 is arranged on the pipeline between the variable motor 14 and the radiator fan motor 21, a third pressure sensor 23 and a first temperature sensor 24 are arranged on the pipeline between the radiator fan motor 21 and the radiator 26, and a second temperature sensor 27 is arranged on the pipeline between the radiator 26 and the hydraulic oil tank 1.

[0076] The beneficial effects of the above further technical solutions are as follows: the first pressure sensor is connected to the constant pressure variable pump and the high pressure filter to show the output pressure of the constant pressure variable pump. The second pressure sensor is used before the radiator fan motor to show the pressure of the oil before flowing through the radiator fan motor. The third pressure sensor is used after the radiator fan motor to show the pressure of the oil after flowing through the radiator fan motor, and by comparing with the pressure shown by the second pressure sensor, it is determined whether the pressure difference before and after the radiator fan motor meets the requirements. The first temperature sensor is used before the radiator to show the temperature of the oil before flowing through the radiator. The second temperature sensor is used after the radiator to show the temperature of the oil after flowing through the radiator, and by comparing with the temperature shown by the first temperature sensor, it is determined whether the cooling effect meets the requirements.

[0077] As shown in Figs. 1-3As shown, further, a first flow sensor 8 is arranged on the pipeline between the pressure reducing valve 9 and the constant pressure variable pump 3, and a second flow sensor 13 is arranged on the pipeline between the variable motor 14 and the constant pressure variable pump 3.

[0078] The beneficial effect of the above further technical solution is that the first flow sensor is connected with the high-pressure filter and measures all the oil flow output by the constant pressure variable pump. The second flow sensor is connected with the variable motor and measures the oil flow passing through the variable motor.

[0079] As shown in the figure, Figs. 1-3 As shown, further, a constant pressure variable pump oil drain port 3-1 is arranged on the constant pressure variable pump 3, the constant pressure variable pump oil drain port 3-1 is connected with a first oil tank 1-4, a pressure reducing valve oil drain port 9-1 is arranged on the pressure reducing valve 9, the pressure reducing valve oil drain port 9-1 is connected with a second oil tank 1-3, a variable motor oil drain port 14-1 is arranged on the variable motor 14, the variable motor oil drain port 14-1 is connected with a third oil tank 1-2, and a radiator fan motor oil drain port 21-1 is arranged on the radiator fan motor 21, the radiator fan motor oil drain port 21-1 is connected with a fourth oil tank 1-1.

[0080] The beneficial effect of the above further technical solution is that the constant pressure variable pump is provided with a constant pressure variable pump oil drain port, which has two functions, one is to inject hydraulic oil before the constant pressure variable pump operates to lubricate the constant pressure variable pump, and the other is to cool the constant pressure variable pump. The constant pressure variable pump oil drain port is directly connected with the first oil tank and is not connected in parallel with other pipelines to the oil tank, which prevents the pressure in the oil drain circuit from being too high, damages the sealing elements of the constant pressure variable pump, and causes the constant pressure variable pump to leak oil. The pressure reducing valve is connected with the high-pressure oil circuit and the variable motor displacement regulating valve to provide hydraulic oil with reduced pressure to the downstream and stabilize the oil pressure. The pressure reducing valve is provided with a pressure reducing valve oil drain port, which is directly connected with the second oil tank. The variable motor is provided with a variable motor oil drain port, which is directly connected with the third oil tank. The radiator fan motor provides power for the radiator fan. The radiator fan motor is provided with a radiator fan motor oil drain port, which is directly connected with the fourth oil tank and is not connected in parallel with other pipelines to the oil tank, which prevents the pressure in the oil drain circuit from being too high, damages the sealing elements of the radiator fan motor, and causes the radiator fan motor to leak oil.

[0081] As shown in the figure, Figs. 1-3 As shown, further, an oil suction filter 2 is arranged on the pipeline between the constant pressure variable pump 3 and the hydraulic oil tank 1, a high-pressure filter 7 is arranged on the pipeline between the pressure reducing valve 9 and the constant pressure variable pump 3, and a back oil filter 28 is arranged on the pipeline between the radiator 26 and the hydraulic oil tank 1.

[0082] The beneficial effects of the further technical solutions are: the oil filter is used for filtering oil liquid from the oil tank to the constant pressure variable pump, ensuring the cleanliness of the oil liquid entering the constant pressure variable pump, and preventing impurities or foreign matters from entering the constant pressure variable pump to damage the constant pressure variable pump and downstream components. The high-pressure filter is connected to the constant pressure variable pump and a downstream hydraulic system, filters impurities of the output oil liquid of the constant pressure variable pump, and outputs clean oil liquid to the downstream hydraulic system. The oil return filter plays a role of filtering impurities of hydraulic oil in the circuit.

[0083] As shown in Figs. 1-3 Further, the constant pressure variable pump 3 is provided with a constant pressure variable pump swash plate, the constant pressure variable pump swash plate is connected to the single-acting spring return piston cylinder 4, and the variable motor 14 is provided with a variable motor swash plate, and the variable motor swash plate is connected to the variable motor displacement adjusting cylinder 11.

[0084] The beneficial effects of the further technical solutions are: the single-acting spring return piston cylinder is connected to the pressure cut-off valve and the constant pressure variable pump swash plate, and controls the displacement of the constant pressure variable pump. The variable motor displacement adjusting cylinder is connected to the variable motor displacement adjusting valve, the adjusting rod and the variable motor swash plate, pushes the variable motor swash plate, changes the angle of the swash plate, and then adjusts the displacement of the variable motor.

[0085] As shown in Figs. 1-3 Further, the variable motor displacement adjusting valve 10 is a proportional valve, the radiator 26 is arranged adjacent to the radiator fan 22, the radiator 26 is connected in parallel with the bypass valve 25, and the opening pressure of the bypass valve 25 is 5 Bar.

[0086] The beneficial effects of the further technical solutions are: the variable motor displacement adjusting valve is connected to the pressure reducing valve, the variable motor displacement adjusting cylinder and the adjusting rod, and the variable motor displacement adjusting valve is a proportional valve, which can steplessly adjust the displacement of the motor according to the input current. The radiator fan plays a role of accelerating the heat dissipation of the radiator. The bypass valve is set to have an opening pressure of 5 Bar, and when the inlet pressure of the radiator exceeds 5 Bar, the bypass valve is opened to protect the radiator.

[0087] As shown in Figs. 1-3 Further, the variable motor 14 is connected in parallel with a proportional overflow valve 15.

[0088] The beneficial effects of the further technical solutions are: the loading pressure can be adjusted by adjusting the proportional overflow valve, and then the loading power is steplessly adjusted, and the proportional overflow valve plays a role of steplessly adjusting the loading pressure of the system.

[0089] As shown in Figs. 1-3As shown in the figure, further comprising: a first overflow valve 16, one end of the first overflow valve 16 is connected with the constant pressure variable pump 3 through a pipeline, and the other end of the first overflow valve 16 is connected with the radiator 26 through a pipeline.

[0090] The beneficial effect of the above further technical scheme is that the first overflow valve is connected in parallel with other circuits, and functions as a safety valve, and is used together with a pressure cut-off valve, thereby achieving double protection.

[0091] As shown in the figure, Figs. 1-3 As shown in the figure, further, the radiator fan motor 21 is connected in parallel with a second overflow valve 17, a check valve 18 and a throttle valve 19, and both ends of the second overflow valve 17, the check valve 18 and the throttle valve 19 are connected with both ends of the radiator fan motor 21 one by one.

[0092] The beneficial effect of the above further technical scheme is that the second overflow valve is used to limit the pressure difference between both ends of the radiator fan motor, so that the radiator fan motor rotates stably. The check valve and the throttle valve constitute a check throttle valve, when the loading is finished, the radiator fan motor will have inertia under the driving of the fan, and the check valve can be quickly opened to supply oil to the radiator fan motor, thereby reducing the impact and protecting the radiator fan motor. Together with the second overflow valve, the check valve can stabilize the pressure difference between both ends of the radiator fan motor, so that the radiator fan motor rotates stably. The throttle valve is connected in parallel with the radiator fan motor, and by adjusting the flow of the throttle valve, the initial working flow required by the radiator fan motor can be adjusted, so as to achieve the purpose that the radiator fan motor does not work when the heat is small, and the radiator fan motor starts to work when the heat is large.

[0093] The present application provides a kind of hydraulic system of roller loading energy recovery test device, can be for the hydraulic control system of harvesting machine roller loading energy recoverable test device.

[0094] The present application will be further described in detail below in combination with the hydraulic system principle diagram of roller loading energy recovery test device.

[0095] As shown in the figure, Figs. 1-3As shown, the present application mainly comprises a hydraulic oil tank 1, an oil suction filter 2, a constant pressure variable pump 3, a single-acting spring return piston cylinder 4, a pressure cut-off valve 5, a first pressure sensor 6, a high-pressure filter 7, a first flow sensor 8, a pressure reducing valve 9, a variable motor displacement adjusting valve 10, a variable motor displacement adjusting cylinder 11, an adjusting rod 12, a second flow sensor 13, a variable motor 14, a proportional relief valve 15, a first relief valve 16, a second relief valve 17, a check valve 18, a throttle valve 19, a second pressure sensor 20, a radiator fan motor 21, a radiator fan 22, a third pressure sensor 23, a first temperature sensor 24, a bypass valve 25, a radiator 26, a second temperature sensor 27, an oil return filter 28, a harvester power input 29, a first gearbox 30, a roller 31, and a second gearbox 32.

[0096] The harvester power input 29 provides power to drive the first gearbox 30; the first gearbox 30 outputs power to the roller 31 to provide power for the roller 31; the roller 31 drives the second gearbox 32 to rotate, and the second gearbox 32 drives the constant pressure variable pump 3 to rotate, and the constant pressure variable pump 3 outputs hydraulic oil to work, thereby realizing hydraulic loading on the roller 31.

[0097] After the constant pressure variable pump 3 sucks oil from the hydraulic oil tank 1 through the oil suction filter 2, the oil is delivered to the downstream circuit, one of which is the pressure cut-off control circuit to control the displacement of the constant pressure variable pump 3, and the other of which is the main oil circuit to realize the loading function.

[0098] First, analyze the pressure cut-off control circuit. When the system pressure does not exceed the pressure set by the pressure cut-off valve 5, the displacement of the constant pressure variable pump 3 is at the set displacement, and the constant pressure variable pump 3 normally supplies oil to the downstream components; when the system pressure exceeds the pressure set by the pressure cut-off valve 5, the left hydraulic pressure of the pressure cut-off valve 5 exceeds the right spring set force, and the pressure cut-off valve 5 changes from the right position to the left position, as shown in the figure. Fig. 1 As shown, the large cavity of the single-acting spring return piston cylinder 4 is connected to high-pressure oil, the piston rod is pushed out, and the swash plate of the constant pressure variable pump 3 is pushed, so that the displacement of the constant pressure variable pump 3 is 0, and the constant pressure variable pump 3 no longer outputs hydraulic oil, thereby protecting the hydraulic system.

[0099] Secondly, the main oil circuit is analyzed. The first pressure sensor 6 is used to display the pressure of the oil output by the constant pressure variable pump 3. The oil passes through the high pressure filter 7 and the first flow sensor 8. The pressure displayed by the first pressure sensor 6 and the flow displayed by the first flow sensor 8 are used to calculate the corresponding power, i.e. the loading power of the hydraulic system. The hydraulic oil is then divided into four paths. From the left, the first path is connected to the first overflow valve 16, which mainly functions as a safety valve. When the system (hydraulic system) pressure is too high and the hydraulic pressure cutoff valve fails, the first overflow valve 16 opens, providing double protection for the hydraulic system. The second path is the proportional overflow valve 15, which mainly functions to set the system loading pressure. The third path of oil mainly functions to recover the energy of the hydraulic system. When the hydraulic oil passes through the second flow sensor 13 and the variable motor 14, the variable motor rotates, driving the HMT gearbox (first gearbox) together with the harvester power input 29 to drive the HMT gearbox (first gearbox), thereby achieving energy recovery. The second flow sensor 13 displays the flow through the variable motor 14, and the ratio of the second flow sensor 13 to the first flow sensor 8 is the energy recovery ratio of the hydraulic system. The pressure difference between the first pressure sensor 6 and the second pressure sensor 20 is the motor inlet and outlet pressure difference. The fourth path of oil mainly functions to control the variable motor 14. When the hydraulic oil flows through the pressure reducing valve 9, it outputs stable and low pressure to the variable motor displacement regulating valve 10. When the proportional valve of the variable motor displacement regulating valve 10 sends a current, the variable motor displacement regulating valve 10 switches to the right position. As shown in FIG. 1, the pressure oil enters the variable motor displacement regulating cylinder 11 left cavity through the variable motor displacement regulating valve 10. The variable motor displacement regulating cylinder 11 piston rod moves to the right, simultaneously driving the adjusting rod 12 to move to the right. The adjusting rod pushes the left spring of the variable motor displacement regulating valve 10, gradually increasing the spring force, and simultaneously pushing the valve core of the variable motor displacement regulating valve 10 to move to the right. Finally, the spring force is equal to the electromagnetic force provided by the proportional valve of the variable motor displacement regulating valve 10, the oil is cut off, and no oil flows into the variable motor displacement regulating cylinder 11. At this time, the variable motor 14 maintains a certain displacement. When the proportional valve of the variable motor displacement regulating valve 10 continues to increase the current, the electromagnetic force is greater than the spring force, and the variable motor displacement regulating valve 10 is pushed to the right position again. The above process is repeated until the spring force and the electromagnetic force are balanced, and the variable motor displacement is stabilized to a higher displacement. This displacement can be adjusted steplessly from 0 to the maximum displacement. Fig. 2

[0100] ​The hydraulic oil continues to go down, passing through the throttle valve 19 and the radiator fan motor 21. Due to the throttling effect of the throttle valve 19, the pressure in front of the radiator fan motor 21 gradually rises. When the pressure difference between the front and back of the radiator fan motor 21 reaches the set pressure of the second overflow valve 17, the second overflow valve 17 opens. The second pressure sensor 20 displays the hydraulic oil pressure in front of the radiator fan motor 21, and the third pressure sensor 23 displays the hydraulic oil pressure behind the radiator fan motor 21. The excess hydraulic oil passes through the second overflow valve 17 to the downstream system, and the pressure difference between the two ends of the radiator fan motor 21 is stabilized, allowing the radiator fan motor 21 to work smoothly. The radiator fan motor 21 drives the radiator fan 22 to work. After passing through the radiator fan motor 21, the hydraulic oil joins the oil passing through the throttle valve 19 and the check valve 18, and then enters the radiator 26. The second pressure sensor 20 displays the inlet pressure of the radiator 26, and the first temperature sensor 24 displays the oil temperature entering the inlet of the radiator 26. When the pressure exceeds the set pressure of the bypass valve 25, the bypass valve 25 opens, and the oil flows through the bypass valve 25 to the downstream and joins the oil passing through the radiator 26. The second temperature sensor 27 displays the hydraulic oil temperature after the radiator 26. By observing the temperature difference between the first temperature sensor 24 and the second temperature sensor 27, the cooling effect of the radiator can be determined. The hydraulic oil after cooling passes through the oil return filter 28 and returns to the hydraulic oil tank 1.

[0101] Finally, the method of using the power recovery hydraulic system (the hydraulic system of the roller loading energy recovery test device) is described. When testing according to the roller loading power and the roller speed, the roller 31 speed is determined by the harvester power input 29 speed. After the roller speed is determined, the constant pressure variable pump 3 output flow can also be determined. Then, the set pressure of the proportional overflow valve 15 is adjusted, and the loading power is determined. At this time, all hydraulic oil flows through the proportional overflow valve 15, and the variable motor 14 displacement is 0, with no energy recovery. Gradually increase the variable motor 14 displacement, and part of the hydraulic oil flows through the variable motor 14. The variable motor starts to output power to the HMT gearbox (first gearbox), and energy recovery has already begun. The energy recovery ratio is determined by the flow rate of the variable motor before and after the pressure difference. Gradually increase the variable motor 14 displacement. If the roller 31 speed is not high, the constant pressure variable pump 3 output hydraulic oil flow can pass through the variable motor 14. At this time, all energy can be recovered, and the variable motor 14 displacement should not be adjusted further. Further adjusting the loading pressure will reduce the loading power. If the roller speed is high, the variable motor 14 displacement is adjusted to the maximum. At this time, part of the hydraulic oil flow passes through the variable motor 14, and the other part passes through the proportional overflow valve 15. At this time, although not all energy can be recovered, the maximum energy recovery ratio has been achieved. In order to increase the energy recovery ratio, a variable motor with the largest possible displacement can be selected.

[0102] Fig. 3The hydraulic cut valve position is shown when the plunger pump displacement is 0. Fig. 2 Fig. 3 The motor variable adjustment process is shown.

[0103] The hydraulic system of the roller loading energy recovery test device can be installed on a whole vehicle and tested in cooperation with other components; the investment is far lower than that of the motor loading and no laboratory is occupied; most of the energy is recovered, the test consumption is small, and the test cost is greatly reduced. The heat dissipation pressure is small, and the test can be continuously operated even in the hottest summer.

[0104] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic system of a drum loading energy recovery test device, characterized by, Comprising: A hydraulic oil tank (1), a constant pressure variable pump (3), a single-acting spring return piston cylinder (4), a pressure cut-off valve (5), a pressure reducing valve (9), a variable motor displacement adjusting valve (10), a variable motor displacement adjusting cylinder (11), an adjusting lever (12), a variable motor (14), a radiator fan motor (21), a radiator fan (22), a radiator (26), a harvester power input (29), a first gearbox (30), a drum (31), a second gearbox (32), the constant pressure variable pump (3) and the radiator (26) are connected with the hydraulic oil tank (1) through pipelines, the constant pressure variable pump (3) is connected with the single-acting spring return piston cylinder (4) and the second gearbox (32) respectively, the single-acting spring return piston cylinder (4) is connected with the pressure cut-off valve (5) through a pipeline, the pressure cut-off valve (5) is connected with the constant pressure variable pump (3) through a pipeline, the pressure reducing valve (9) is connected with the constant pressure variable pump (3) and the pressure cut-off valve (5) through a pipeline, the variable motor displacement adjusting valve (10) is connected with the pressure reducing valve (9) and the variable motor displacement adjusting cylinder (11) through pipelines respectively, the adjusting lever (12) is connected with the variable motor displacement adjusting valve (10) and the variable motor displacement adjusting cylinder (11) respectively, the variable motor (14) is connected with the variable motor displacement adjusting cylinder (11) and the first gearbox (30) respectively, the variable motor (14) is connected with the constant pressure variable pump (3), the pressure cut-off valve (5), the radiator fan motor (21) and the radiator (26) through pipelines respectively, the radiator fan (22) is connected with the radiator fan motor (21), the harvester power input (29) is connected with the first gearbox (30), and the drum (31) is connected with the first gearbox (30) and the second gearbox (32) respectively.

2. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein A first pressure sensor (6) is arranged on the pipeline between the pressure reducing valve (9) and the constant pressure variable pump (3), a second pressure sensor (20) is arranged on the pipeline between the variable motor (14) and the radiator fan motor (21), a third pressure sensor (23) and a first temperature sensor (24) are arranged on the pipeline between the radiator fan motor (21) and the radiator (26), and a second temperature sensor (27) is arranged on the pipeline between the radiator (26) and the hydraulic oil tank (1).

3. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein, A first flow sensor (8) is arranged on the pipeline between the pressure reducing valve (9) and the constant pressure variable pump (3), and a second flow sensor (13) is arranged on the pipeline between the variable motor (14) and the constant pressure variable pump (3).

4. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein The constant pressure variable pump (3) is provided with a constant pressure variable pump oil drain port (3-1), the constant pressure variable pump oil drain port (3-1) is connected with a first oil tank (1-4), the pressure reducing valve (9) is provided with a pressure reducing valve oil drain port (9-1), the pressure reducing valve oil drain port (9-1) is connected with a second oil tank (1-3), the variable motor (14) is provided with a variable motor oil drain port (14-1), the variable motor oil drain port (14-1) is connected with a third oil tank (1-2), and the radiator fan motor (21) is provided with a radiator fan motor oil drain port (21-1), and the radiator fan motor oil drain port (21-1) is connected with a fourth oil tank (1-1).

5. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein The pipeline between the constant pressure variable pump (3) and the hydraulic oil tank (1) is provided with an oil suction filter (2), the pipeline between the pressure reducing valve (9) and the constant pressure variable pump (3) is provided with a high-pressure filter (7), and the pipeline between the radiator (26) and the hydraulic oil tank (1) is provided with an oil return filter (28).

6. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein The constant pressure variable pump (3) is provided with the constant pressure variable pump swash plate, the constant pressure variable pump swash plate is connected with the single-acting spring return piston cylinder (4), and the variable motor (14) is provided with a variable motor swash plate, and the variable motor swash plate is connected with the variable motor displacement adjusting cylinder (11).

7. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein The variable motor displacement adjusting valve (10) is a proportional valve, the radiator (26) is arranged adjacent to the radiator fan (22), the radiator (26) is connected in parallel with a bypass valve (25), and the opening pressure of the bypass valve (25) is 5 Bar.

8. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein, The variable motor (14) is connected in parallel with a proportional overflow valve (15).

9. The hydraulic system of a drum loaded energy recovery test device of claim 1, wherein, Further comprising: A first overflow valve (16), one end of the first overflow valve (16) is connected with the constant pressure variable pump (3) through a pipeline, and the other end of the first overflow valve (16) is connected with the radiator (26) through a pipeline.

10. The hydraulic system of a drum loading energy recovery test device according to claim 1, wherein, The radiator fan motor (21) is connected in parallel with a second overflow valve (17), a check valve (18) and a throttle valve (19), and the two ends of the second overflow valve (17), the check valve (18) and the throttle valve (19) are connected with the two ends of the radiator fan motor (21) one by one.

Images