CN109883744B - Device and method for analyzing thermal balance of excavator - Google Patents
Device and method for analyzing thermal balance of excavator Download PDFInfo
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- CN109883744B CN109883744B CN201910133227.6A CN201910133227A CN109883744B CN 109883744 B CN109883744 B CN 109883744B CN 201910133227 A CN201910133227 A CN 201910133227A CN 109883744 B CN109883744 B CN 109883744B
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Abstract
The invention discloses a device and a method for excavator heat balance analysis, which comprises the following steps: the excavator comprises an excavator power system, a manual reversing valve, an electric proportional motor, a hydraulic dynamometer, a one-way electric proportional differential pressure adjusting device and an oil supplementing pump motor set; a manual reversing valve is arranged at the front end of a power system of the excavator; an electric proportional motor is arranged at the front end of the manual reversing valve; a unidirectional electric proportional differential pressure regulating device is arranged on the left side of the electric proportional motor; the electric proportional motor is respectively provided with an oil supplementing port and an oil draining port; the rear end of an output shaft of the electric proportional motor is connected with a hydraulic dynamometer; and an oil supplementing pump motor set is arranged at an oil supplementing port and an oil draining port of the electric proportional motor. The device can simulate an actual load indoors, load and adjust a water circulation heat dissipation system for the engine through the hydraulic dynamometer, load and adjust an oil circulation heat dissipation system for the oil path through the proportional pressure difference device, and analyze the heat balance performance of the whole excavator according to data collected by the sensor.
Description
Technical Field
The invention relates to the technical field of excavator thermal balance, in particular to a device and a method for excavator thermal balance analysis.
Background
The existing hydraulic excavator has the problems of high water temperature, water temperature alarm, overheating of hydraulic oil temperature and the like in the using process due to complex and various working conditions and severe using environment, particularly in summer, the hydraulic excavator easily causes the boiling of an engine under continuous working, and the leakage of hydraulic system components causes the conditions of slow action, low working efficiency and even incapability of working and the like. The excavator heat balance test method has no corresponding national or industrial standard in our country at present, and various excavator enterprises cannot widely apply the heat balance test of the hydraulic excavator due to the reasons of lack of understanding of the importance of the heat dissipation performance of a hydraulic system of the hydraulic excavator, equipment, technology, cost and the like, and most of the cooling systems of the hydraulic excavator are designed by depending on the experience of designers, so that the heat dissipation performance of the hydraulic excavator cannot be accurately mastered at all.
Disclosure of Invention
The invention aims to provide a device and a method for excavator thermal balance analysis.
In order to achieve the above object, the present invention employs the following:
an apparatus and method for excavator thermal balance analysis, comprising: the excavator comprises an excavator power system, a manual reversing valve, an electric proportional motor, a hydraulic dynamometer, a one-way electric proportional differential pressure adjusting device and an oil supplementing pump motor set; a manual reversing valve is arranged at an oil outlet of an oil pump of the excavator power system; an electric proportional motor is arranged at the front end of the manual reversing valve; a one-way electric proportional differential pressure regulating device is arranged at an oil inlet of the electric proportional motor; the electric proportional motor is respectively provided with an oil supplementing port and an oil draining port; the output shaft of the electric proportional motor is connected with a hydraulic dynamometer; and an oil supplementing pump motor set is arranged at an oil supplementing port and an oil draining port of the electric proportional motor.
Preferably, an A, B port is arranged at the front end of the manual reversing valve; the port A of the manual reversing valve is connected with an oil inlet of the electric proportional motor, the port B of the manual reversing valve is connected with an oil outlet of the electric proportional motor, and a one-way electric proportional differential pressure adjusting device is arranged between the port A of the manual reversing valve and the oil inlet of the electric proportional motor; a first check valve, a second check valve and a flowmeter are respectively arranged on pipelines at the inlet and the outlet of the one-way electric proportional pressure difference adjusting device; the electric proportional motor is communicated with the oil supplementing pump motor set through an oil pipeline, and a high-pressure filter and a pressure pipe are respectively arranged on the oil pipeline at the front end of the oil supplementing pump motor set; and a pressure gauge and an overflow valve are respectively arranged on two sides of the pressure pipe.
Preferably, the excavator power system comprises an excavator engine, a hydraulic pump, an oil tank and a water tank; the excavator engine is connected with the hydraulic pump; an oil suction port of the hydraulic pump is connected with an oil tank; an oil outlet of the hydraulic pump is connected with a manual reversing valve; and a water tank is arranged on the engine of the excavator.
Preferably, a relief valve is provided on an oil line of an oil outlet of the hydraulic pump.
Preferably, a water circulation heat dissipation device and a plurality of temperature sensors are arranged on the water tank; and the oil tank is provided with an oil liquid circulating radiator and a plurality of temperature sensors.
Preferably, the unidirectional electric proportional pressure difference adjusting device can perform stepless adjustment on the pressure difference between the two ends of the inlet and the outlet according to an electric signal.
In order to achieve the above object, the present invention employs the following:
a method for excavator thermal balance analysis, comprising the steps of:
1) simulating the actual working condition of the excavator by using the hydraulic dynamometer to load the electric proportional motor for improving the power output of the engine of the excavator to cause the temperature of the water tank to be increased;
2) the heat of water circulation exchange is obtained through the cooperation of a temperature sensor on the water tank and a water circulation heat dissipation device;
3) the method is characterized in that a one-way electric proportional pressure difference adjusting device is adjusted to adjust the pressure difference delta P between an inlet of an electric proportional motor and a safety valve, meanwhile, a corresponding flow Q when the electric proportional motor works is measured through a flow sensor, and the heat obtained from oil is calculated through Q heat = K delta Pq;
4) the unidirectional electric proportional pressure difference adjusting device is matched with the hydraulic dynamometer, control parameters of the hydraulic dynamometer are reasonably adjusted, and actual load can be simulated, so that the performances of an oil liquid circulating heat dissipation system and a water circulating heat dissipation system of the excavator under different working conditions are researched, and the thermal balance of the excavator is analyzed.
The invention has the following advantages:
this device reasonable in design, convenient to use, and the function is various, can be at indoor simulation actual load to adjust water circulation cooling system ring, adjust fluid circulation cooling system etc. through one-way electric proportion pressure differential adjusting device through the hydraulic dynamometer machine, gather data through a plurality of sensors and carry out the analysis to the heat balance performance of excavator.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an apparatus and a method for excavator thermal balance analysis according to the present invention.
In the figures, the various reference numbers are:
the hydraulic control system comprises a 1-oil tank, a 2-hydraulic oil radiator, a 3-manual reversing valve, a 4-electric proportional motor, a 5-hydraulic dynamometer, a 6-one-way valve, a 7-one-way electric proportional differential pressure adjusting device, a 8-two-way valve, a 9-safety valve, a 10-hydraulic pump, an 11-excavator engine, a 12-water tank, a 13-oil supplementing pump motor set, a 14-high-pressure filter, a 15-overflow valve, a 16-pressure gauge and a 17-pressure pipe.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, an apparatus and method for excavator thermal balance analysis includes: the system comprises an excavator power system, a manual reversing valve 3, an electric proportional motor 4, a hydraulic dynamometer 5, a one-way electric proportional differential pressure adjusting device 7 and an oil supplementing pump motor set 13; a manual reversing valve 3 is arranged at an oil outlet of an oil pump of the excavator power system; an electric proportional motor 4 is arranged at the front end of the manual reversing valve 3; a one-way electric proportional differential pressure regulating device 7 is arranged at an oil inlet of the electric proportional motor 4; the electric proportional motor 4 is respectively provided with an oil supplementing port and an oil draining port; the output shaft of the electric proportional motor 4 is connected with a hydraulic dynamometer 5; an oil supplementing pump motor set 13 is arranged at an oil supplementing port and an oil draining port of the electric proportional motor 4; through setting up above-mentioned part, be convenient for make better operation of this device, can improve work efficiency, the energy saving.
An A, B port is arranged at the front end of the manual reversing valve 3; the port A of the manual reversing valve 3 is connected with an oil inlet of the electric proportional motor 4, the port B of the manual reversing valve 3 is connected with an oil outlet of the electric proportional motor 4, and a one-way electric proportional differential pressure adjusting device 7 is arranged between the port A of the manual reversing valve 3 and the oil inlet of the electric proportional motor 4; a first check valve 6, a second check valve 8 and a flowmeter are respectively arranged on pipelines at the inlet and the outlet of the one-way electric proportional pressure difference adjusting device 7; the electric proportional motor 4 is communicated with the oil supplementing pump motor set 13 through an oil pipeline, and a high-pressure filter 14 and a pressure pipe 17 are respectively arranged on the oil pipeline at the front end of the oil supplementing pump motor set 13; a pressure gauge 16 and an overflow valve 15 are respectively arranged on two sides of the pressure pipe 17, and the overflow valve 15 is arranged, so that the pressure in the oil pipe can be released conveniently; when the pressure in the protected system rises to exceed the allowable value, the valve of the overflow valve 15 automatically opens to discharge part of redundant medium so as to prevent the pressure of the system from rising continuously, and when the pressure of the system drops to the specified value, the valve automatically closes so as to ensure the normal operation of the system.
The excavator power system comprises an excavator engine 11, a hydraulic pump 10, an oil tank 1 and a water tank 12; the excavator engine 11 is connected with the hydraulic pump 10, so that energy can be conveniently supplied to the engine; an oil suction port of the hydraulic pump 10 is connected with the oil tank 1, so that oil can be conveniently supplied to the hydraulic pump 10 through the oil tank 1; an oil outlet of the hydraulic pump 10 is connected with the manual reversing valve 3, so that power energy can be conveniently provided for the manual reversing valve 3; a water tank 12 is arranged on the engine 11 of the excavator, so that water can be conveniently supplied to the device.
A safety valve 9 is arranged on an oil pipeline of an oil outlet of the hydraulic pump 10, and when the mechanical breather valve fails, the safety valve 9 on the hydraulic pump 10 can replace the mechanical breather valve to perform air exhaust and air release and is also used for protecting a system from overpressure operation.
The water tank 12 is provided with a water circulation heat dissipation device and a plurality of temperature sensors, the water circulation heat dissipation device is arranged to dissipate the temperature in the water tank 12, so that the water tank 12 is always kept in a fixed range, and the temperature sensors are arranged on the water tank 12 to monitor the temperature of the water tank 12; the oil tank 1 is provided with an oil circulating radiator and a plurality of temperature sensors, the oil circulating radiator is convenient to dissipate the temperature in the oil tank 1, the oil tank 1 is always kept in a fixed range, and the temperature sensors are arranged on the oil tank 1, so that the temperature of the oil tank 1 can be monitored conveniently.
The unidirectional electric proportional pressure difference adjusting device 7 can perform stepless adjustment on the pressure difference at the two ends of the inlet and the outlet according to electric signals, so that the device is always kept in a constant pressure difference range, the service life of the device is prolonged, and the working efficiency is improved.
The device is a method for analyzing the heat balance of the excavator, and comprises the following steps:
1) the hydraulic dynamometer 5 is used for simulating the actual working condition of the excavator to load the electric proportional motor 4 for improving the power output of an engine 11 of the excavator to cause the temperature of a water tank 12 to be improved;
2) the heat of water circulation exchange is obtained through the cooperation of a temperature sensor on the water tank 12 and a water circulation heat dissipation device;
3) the unidirectional electric proportional pressure difference adjusting device 7 is used for adjusting the pressure difference delta P between the inlet of the electric proportional motor 4 and the safety valve 9, meanwhile, the corresponding flow Q when the electric proportional motor 4 works is measured through a flow sensor, and the heat obtained by oil is calculated through Q heat = K delta Pq;
4) the unidirectional electric proportional pressure difference adjusting device 7 is matched with the hydraulic dynamometer 5, control parameters of the hydraulic dynamometer 5 are reasonably adjusted, and actual loads can be simulated, so that the performances of an oil liquid circulating heat dissipation system and a water circulating heat dissipation system of the excavator under different working conditions are researched, and the thermal balance of the excavator is analyzed.
For an oil dispersion system, Q heat = kx Δ PXQ, wherein Δ P is the pressure difference of the oil dispersion system, and Q is the flow passing through the oil dispersion system; the heat of the oil dispersion system can be calculated by accurately adjusting the delta P of the oil dispersion system and reading the flow through a flow sensor; meanwhile, the heat of the water dissipation system under different delta P can be measured through the water conservancy dynamometer, and data are provided for the heat balance research of the excavator.
The heat balance performance of the excavator of the device is the conversion of standard environment temperature of 45 ℃, the oil temperature of an oil outlet of an oil radiator is converted to obtain a temperature B, if the temperature B is not more than 85 ℃, the heat radiation performance of the oil radiator is proved to be normal, and the calculation formula is as follows:
B=T8+（F-T0）×η
in the formula:
b is the temperature of hydraulic oil converted by an OEM standard, and the unit is;
f is the environmental temperature under the OEM standard and is 45 ℃;
t0 is the exact ambient temperature at the time of testing, in units;
eta is the coefficient of the oil temperature changing along with the air temperature, and generally takes 0.8;
opening a data acquisition instrument to acquire signals, starting the hydraulic excavator for the test, starting an air conditioner refrigeration effect, operating a handle to enable a movable arm and a bucket to be suppressed, circularly excavating and unloading a bucket rod, continuously operating until the temperature of each temperature test point is unchanged and lasts more than fifteen minutes, determining that the thermal balance of the hydraulic excavator reaches a balanced state at the moment, storing data, and respectively substituting the acquired data into a heat dispersion formula of the device for evaluation: ABT = (a-T5) + T0; evaluating a heat radiation formula of the device: ABT = (A-T5) + T0, ABT is required to be not less than 50 ℃, and if the value of ABT is calculated to be less than 50 ℃ according to data obtained by testing, the current heat dissipation of the device is proved to be in an undesirable state, and timely overhaul and inspection are required.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention. .
Claims (7)
1. An apparatus for excavator thermal balance analysis, comprising: the excavator comprises an excavator power system, a manual reversing valve, an electric proportional motor, a hydraulic dynamometer, a one-way electric proportional differential pressure adjusting device and an oil supplementing pump motor set; a manual reversing valve is arranged at an oil outlet of an oil pump of the excavator power system; an electric proportional motor is arranged at the front end of the manual reversing valve; a one-way electric proportional differential pressure regulating device is arranged at an oil inlet of the electric proportional motor; the electric proportional motor is respectively provided with an oil supplementing port and an oil draining port; the output shaft of the electric proportional motor is connected with a hydraulic dynamometer; and an oil supplementing pump motor set is arranged at an oil supplementing port and an oil draining port of the electric proportional motor.
2. The device for excavator thermal balance analysis according to claim 1, wherein A, B port is provided at the front end of the manual directional control valve; the port A of the manual reversing valve is connected with an oil inlet of the electric proportional motor, the port B of the manual reversing valve is connected with an oil outlet of the electric proportional motor, and a one-way electric proportional differential pressure adjusting device is arranged between the port A of the manual reversing valve and the oil inlet of the electric proportional motor; a first check valve, a second check valve and a flowmeter are respectively arranged on pipelines at the inlet and the outlet of the one-way electric proportional pressure difference adjusting device; the electric proportional motor is communicated with the oil supplementing pump motor set through an oil pipeline, and a high-pressure filter and a pressure pipe are respectively arranged on the oil pipeline at the front end of the oil supplementing pump motor set; and a pressure gauge and an overflow valve are respectively arranged on two sides of the pressure pipe.
3. The device for excavator thermal balance analysis of claim 1, wherein the excavator power system comprises an excavator engine, a hydraulic pump, an oil tank and a water tank; the excavator engine is connected with the hydraulic pump; an oil suction port of the hydraulic pump is connected with an oil tank; an oil outlet of the hydraulic pump is connected with a manual reversing valve; and a water tank is arranged on the engine of the excavator.
4. The apparatus for thermal balance analysis of an excavator according to claim 3, wherein a relief valve is provided on an oil line pipe of an oil outlet of the hydraulic pump.
5. The device for excavator thermal balance analysis according to claim 4, wherein a water circulation heat sink and a plurality of temperature sensors are provided on the water tank; and the oil tank is provided with an oil liquid circulating radiator and a plurality of temperature sensors.
6. The device for thermal balance analysis of the excavator as claimed in claim 1, wherein the unidirectional electric proportional pressure difference adjusting device can perform stepless adjustment of the pressure difference between the inlet and the outlet according to an electric signal.
7. A method for excavator thermal balance analysis, which is realized by the device for excavator thermal balance analysis of claim 5, and comprises the following steps:
1) simulating the actual working condition of the excavator by using the hydraulic dynamometer to load the electric proportional motor for improving the power output of the engine of the excavator to cause the temperature of the water tank to be increased;
2) the heat of water circulation exchange is obtained through the cooperation of a temperature sensor on the water tank and a water circulation heat dissipation device;
3) the method is characterized in that a one-way electric proportional pressure difference adjusting device is adjusted to adjust the pressure difference delta P between an inlet of an electric proportional motor and a safety valve, meanwhile, a corresponding flow Q when the electric proportional motor works is measured through a flow sensor, and the heat obtained from oil is calculated through Q heat = K delta Pq;
4) the unidirectional electric proportional pressure difference adjusting device is matched with the hydraulic dynamometer, control parameters of the hydraulic dynamometer are reasonably adjusted, and actual load can be simulated, so that the performances of an oil liquid circulating heat dissipation system and a water circulating heat dissipation system of the excavator under different working conditions are researched, and the thermal balance of the excavator is analyzed.
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| CN111753372B (en) * | 2020-06-11 | 2023-09-15 | 雷沃重工集团有限公司 | Heat balance simulation method and system for whole excavator |
| CN113550371A (en) * | 2021-06-22 | 2021-10-26 | 徐州徐工挖掘机械有限公司 | Excavator hydraulic oil warming system and control method thereof |
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