A test device and method for testing the performance of a cooling system of a working machine

Abstract

The application discloses a testing device and method for performance testing of an engineering machinery cooling system, and the testing device comprises an engineering machinery cooling system simulation unit, a wind volume testing wind tunnel, a heat source simulation unit, an electrical control unit and a data acquisition unit. The engineering machinery cooling system simulation unit is used for simulating the structural arrangement of the engineering machinery cooling system. The wind volume testing wind tunnel is used for measuring the wind volume of the engineering machinery cooling system and comprises a fixed section and a movable section. One end of the movable section is slidably connected with one end of the fixed section, and the other end of the movable section is connected with an air outlet of the engineering machinery cooling system. The heat source simulation unit is used for simulating the heat load state of the engineering machinery cooling system during work. The electrical control unit is connected with the engineering machinery cooling system simulation unit, the wind volume testing wind tunnel and the heat source simulation unit and controls the running state of the engineering machinery cooling system simulation unit, the wind volume testing wind tunnel and the heat source simulation unit. The data acquisition unit acquires the testing parameters. The application simulates the whole machine structure for testing from the whole perspective, thereby obtaining accurate cooling system performance testing data, providing data support for the design and development of the cooling system and effectively shortening the development cycle.

Description

Technical Field

[0001] This invention belongs to the field of performance testing technology for cooling systems of engineering machinery, and specifically relates to a testing device and method for performance testing of cooling systems of engineering machinery. Background Technology

[0002] Loaders and other construction machinery operate under complex and varied conditions in harsh environments. Therefore, the performance matching design of the cooling system is crucial to ensuring the normal operation of these machines. Currently, cooling system performance is tested independently using fan performance test benches and radiator core test benches. The test data is combined with simulation calculations to perform cooling system matching calculations and overall machine thermal balance performance tests. However, due to the limited availability of test data, the impact of factors such as radiator assembly, fan-radiator structural arrangement, and shroud structure on cooling system performance lacks reference data, and the overall performance of the cooling system can only be estimated. While overall machine thermal balance tests provide reliable data, the limitations of the overall testing environment prevent them from covering various extreme operating conditions, and the test data cannot reflect the ultimate performance limits of the cooling system. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a testing device and method for performance testing of cooling systems in engineering machinery. By simulating the overall structure of the machine from a holistic perspective, accurate performance test data of the cooling system can be obtained, providing data support for the design and development of the cooling system and effectively shortening the development cycle.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] Firstly, a testing device for performance testing of a cooling system in construction machinery is provided, comprising: a simulation unit for the cooling system of construction machinery, used to simulate the structural layout of the cooling system; an airflow testing wind tunnel for measuring the airflow of the cooling system, including a fixed section and a movable section, one end of the movable section being slidably connected to one end of the fixed section, and the other end being connected to the air outlet of the cooling system; a heat source simulation unit connected to the simulation unit for simulating the thermal load state of the cooling system during operation; an electrical control unit connected to the simulation unit, the airflow testing wind tunnel, and the heat source simulation unit respectively, and controlling their operating states; and a data acquisition unit connected to the simulation unit, the airflow testing wind tunnel, and the heat source simulation unit respectively, and collecting their test parameters.

[0006] Furthermore, the movable section includes: a housing; a front partition connected to one end of the housing and adapted to the shape of the engineering machinery cooling system, used to separate the air inlet and air outlet of the engineering machinery cooling system, and to place the air inlet outside the housing and the air outlet inside the housing; the other end of the housing is slidably connected to the fixed section through a side guide device provided on the outside of the fixed section, and a dry roller is provided at the bottom end of the housing.

[0007] Furthermore, a rear sealing plate is provided between the housing and the fixed section. The rear sealing plate is used to fill the gap between the housing and the fixed section to prevent air leakage in the air volume test tunnel.

[0008] Furthermore, the fixed section includes an air volume measuring chamber and a static pressure sampling test device, an air temperature sampling and measuring device, a rectifier, a multi-nozzle combined air volume testing device, and a flow stabilizing device installed in the air volume measuring chamber, as well as an auxiliary fan installed at the end of the air volume measuring chamber. The outlet of the auxiliary fan is provided with an exhaust pipe, and the auxiliary fan is used to guide the air discharged from the air outlet of the engineering machinery cooling system to the outside.

[0009] Furthermore, the heat source simulation unit includes a coolant heating circulation module, which includes a water tank with a built-in first electric heater. The outlet of the water tank is connected to the inlet of a water pump, and the outlet of the water pump is connected to the coolant inlet of the engineering machinery cooling system. A first flow meter and a first pipe heater are also installed on the outlet pipe of the water pump. The coolant outlet of the engineering machinery cooling system is connected to the inlet of the water tank.

[0010] Furthermore, the coolant heating circulation module also includes a rapid drainage circuit and a waste liquid collection circuit in the pipeline. The rapid drainage circuit and the waste liquid collection circuit in the pipeline include: a pump; a first valve disposed between the inlet and the outlet of the pump; a second valve disposed between the inlet of the pump and the outlet of the water tank; a third valve disposed between the outlet of the pump and the outlet of the water tank; a fourth valve disposed between the outlet of the pump and the outlet of the water tank; and a drainage valve disposed between the common pipeline of the first valve and the third valve and the outlet.

[0011] Furthermore, the heat source simulation unit also includes a pressurized air heating circulation module, which includes an air storage tank. The outlet of the air storage tank is connected to the inlet of the Roots blower through a pressure regulating valve. The outlet of the Roots blower is connected to the pressurized air inlet of the engineering machinery cooling system. A second pipeline heater is also installed on the outlet pipeline of the Roots blower. The pressurized air outlet of the engineering machinery cooling system is connected to the inlet of the Roots blower. A bypass valve is installed between the inlet and outlet of the Roots blower.

[0012] Furthermore, the heat source simulation unit also includes a hydraulic oil heating circulation module and a transmission oil heating circulation module. The hydraulic oil heating circulation module includes an oil tank with a built-in second electric heater. The outlet of the oil tank is connected to the inlet of the oil pump, and the outlet of the oil pump is connected to the inlet of the solenoid directional valve. The first outlet of the solenoid directional valve is connected to the hydraulic oil inlet of the engineering machinery cooling system through a small-range flow meter. The second outlet of the solenoid directional valve is connected to the hydraulic oil inlet of the engineering machinery cooling system through a large-range flow meter. The hydraulic oil outlet of the engineering machinery cooling system is connected to the inlet of the oil tank. The structural configuration of the transmission oil heating circulation module is the same as that of the hydraulic oil heating circulation module.

[0013] Furthermore, both the hydraulic oil heating circulation module and the transmission oil heating circulation module are equipped with a drain circuit and a waste liquid collection circuit in the pipeline.

[0014] Furthermore, the engineering machinery cooling system includes, but is not limited to, a loader power compartment simulation system, a blower-type loader cooling system, a suction-type loader cooling system, a single fan system, a single radiator core system, and a radiator assembly and fan system.

[0015] Secondly, a testing method for performance testing of a cooling system for construction machinery is provided, employing the testing device for performance testing of a cooling system for construction machinery as described in the first aspect. The method includes: installing the cooling system to be tested into a simulation unit based on the structure and layout characteristics of the cooling system during use; connecting the air outlet of the cooling system to be tested to a movable section of an airflow testing tunnel; connecting a heat source simulation unit to the cooling system to be tested according to the test items; controlling the operating status of the cooling system simulation unit, the airflow testing tunnel, and the heat source simulation unit respectively through an electrical control unit; and collecting test parameters of the cooling system simulation unit, the airflow testing tunnel, and the heat source simulation unit respectively through a data acquisition unit to form a test dataset for evaluating the performance of the cooling system for construction machinery.

[0016] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: This invention simulates the structural layout of a cooling system for engineering machinery using a simulation unit; measures the airflow of the cooling system using an airflow testing wind tunnel; simulates the thermal load state of the cooling system during operation using a heat source simulation unit connected to the simulation unit; includes an electrical control unit connected to the simulation unit, airflow testing wind tunnel, and heat source simulation unit respectively, controlling their operating states; and a data acquisition unit connected to the simulation unit, airflow testing wind tunnel, and heat source simulation unit respectively, collecting their test parameters. From a holistic perspective, this invention places all components affecting the cooling system on a test bench, simulating the entire machine structure for testing, thereby obtaining accurate cooling system performance test data, providing data support for cooling system design and development, and effectively shortening the development cycle. Attached Figure Description

[0017] Figure 1 This is a general structural block diagram of a testing device for performance testing of engineering machinery cooling systems provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the performance test implementation structure of the air-blowing loader cooling system in this embodiment of the invention;

[0019] Figure 3 This is a schematic diagram of the performance test implementation structure of the suction loader cooling system in this embodiment of the invention;

[0020] Figure 4 This is a schematic diagram illustrating the working principle of the coolant heating circulation module in this embodiment of the invention;

[0021] Figure 5 This is a schematic diagram illustrating the working principle of the pressurized air heating circulation module in this embodiment of the invention;

[0022] Figure 6 This is a schematic diagram illustrating the working principle of the hydraulic oil heating circulation module and the transmission oil heating circulation module in this embodiment of the invention;

[0023] In the diagram: 1. Power compartment simulation system; 2. Movable section; 201. Front partition; 202. Housing; 203. Rollers; 204. Side guide device; 3. Air volume measurement chamber; 301. Static pressure sampling test device; 302. Air temperature sampling and measurement device; 303. Rectifier; 304. Multi-nozzle combination air volume test device; 305. Flow stabilizing device; 306. Chamber housing; 307. Air valve; 308. Support base; 4. Auxiliary fan; 5. Exhaust pipe; 6. 601. Coolant heating and circulation module; 602. Water tank; 603. Water inlet; 604. Level gauge; 605. First electric heater; 606. Water pump; 607. Drain outlet; 608. Drain valve; 609. First flow meter; 610. First valve; 611. Second valve; 612. Third valve; 613. Fourth valve; 614. Pump; 615. Inlet thermometer; 616. Outlet thermometer; 617. First inlet / outlet... Differential pressure transmitter; 618. Power compartment simulation system radiator; 7. Pressurized air heating and circulation module; 701. Air tank; 702. Air valve; 703. Air inlet; 704. Pressure regulating valve; 705. Roots blower; 706. Bypass air valve; 707. Second pipeline heater; 708. Second flow meter; 709. Inlet pressure sensor; 710. Inlet temperature sensor; 711. Second inlet and outlet differential pressure transmitter; 712. Outlet pressure sensor; 713. Outlet... Temperature sensor; 8. Hydraulic oil heating and circulation module; 801. Oil tank; 802. Filling port; 803. Second electric heater; 804. Oil pump; 805. Drain port; 806. Solenoid directional valve; 807. Small-range flow meter; 808. Large-range flow meter; 809. Rapid drainage circuit and waste liquid collection circuit in pipeline; 810. Inlet oil temperature sensor; 811. Third inlet and outlet differential pressure sensor; 812. Outlet oil temperature sensor; 9. Transmission oil heating and circulation module. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0025] Example 1:

[0026] A testing device for performance testing of a cooling system in construction machinery includes: a cooling system simulation unit for simulating the structural layout of the cooling system; an airflow testing wind tunnel for measuring the airflow of the cooling system, comprising a fixed section and a movable section, one end of the movable section being slidably connected to one end of the fixed section and the other end being connected to the air outlet of the cooling system; a heat source simulation unit connected to the cooling system simulation unit for simulating the thermal load state of the cooling system during operation; an electrical control unit connected to the cooling system simulation unit, the airflow testing wind tunnel, and the heat source simulation unit respectively, and controlling their operating states; and a data acquisition unit connected to the cooling system simulation unit, the airflow testing wind tunnel, and the heat source simulation unit respectively, and collecting their test parameters.

[0027] like Figures 1-3 As shown, this embodiment uses the performance test of the loader's power compartment cooling system as an example to further illustrate the testing device for performance testing of engineering machinery cooling systems described in this invention. The loader's power compartment simulation system 1 is installed within the engineering machinery cooling system simulation unit and includes a hood, radiator, fan, fan speed and torque sensor, fan drive motor, and support fixtures to simulate the structural layout of the loader's power compartment. The movable section 2, fixed section, airflow measurement chamber 3, auxiliary fan 4, and exhaust pipe 5 are arranged sequentially to form a variable-length airflow testing wind tunnel.

[0028] The power compartment simulation system 1 is placed in front of the movable section 2. The length of the movable section 2 extending out of the air volume measurement chamber 3 is adjusted according to the length of the air outlet side of the power compartment simulation system 1. The housing 202 of the movable section 2 is nested on the air volume measurement chamber 3. An auxiliary fan 4 and an exhaust pipe 5 are set at the rear end of the air volume measurement chamber 3. The heat source simulation unit is placed on the left side of the air volume measurement chamber 3 to shorten the pipeline length of the heat medium entering and exiting the power compartment simulation system 1.

[0029] The movable section 2 consists of a front partition 201, a housing 202, rollers 203, a side guide device 204, and a rear sealing plate 205. The front partition 201 is made of thin wood cut according to the shape of the loader's power compartment and is connected to the housing 202 with rivets on all four sides. The gap between the front partition 201 and the loader's power compartment is sealed with heat insulation cotton to prevent backflow of air from the outlet side. The length of the air chamber of the movable section 2 is adjusted by the rollers 203 and the side guide device 204. The side guide device 204 is provided with positioning holes. After the movable section 2 is adjusted to the appropriate position by manually pushing and pulling, the positioning pin is inserted to position the movable section 2. The extension length of the movable section 2 can be adjusted to meet the air volume testing requirements of the loader's power compartment with different structures.

[0030] The air volume measurement chamber 3 consists of a static pressure sampling test device 301, an air temperature sampling test device 302, a rectifier device 303, a multi-nozzle combination air volume test device 304, a flow stabilizing device 305, a chamber housing 306, an air valve 307, and a support base 308. By selecting multiple nozzles of different specifications for combination, it can meet the testing needs of various air volume ranges.

[0031] The auxiliary fan 4 and exhaust pipe 5 are located at the rear end of the air volume measurement chamber 3 to guide the air from the power compartment to the outside.

[0032] The heat source simulation unit consists of a coolant heating circulation module 6, a booster air heating circulation module 7, a hydraulic oil heating circulation module 8, and a transmission oil heating circulation module 9. The heat source simulation unit heats the medium to a set temperature through an electric heater, thereby simulating the thermal load state of the loader's working condition.

[0033] The structure of the coolant heating circulation module 6 is as follows: Figure 4 As shown, the system includes a water tank 601, a water inlet 602, a level gauge 603, a first electric heater 604, a water pump 605, a drain outlet 606, a drain valve 607, a first flow meter 608, a first valve 609, a second valve 610, a third valve 611, a fourth valve 612, a pumping pump 613, an inlet thermometer 614, an outlet thermometer 615, a first pipeline heater 616, a first inlet / outlet differential pressure transmitter 617, and a power compartment simulation system radiator 618; the water tank 601 has a built-in first electric heater 604. 04. The outlet of water tank 601 is connected to the inlet of water pump 605, and the outlet of water pump 605 is connected to the coolant inlet of the engineering machinery cooling system (i.e., the coolant inlet of the test specimen, which in this embodiment is the coolant inlet of the power compartment simulation system radiator 618). The first flow meter 608 and the first pipe heater 616 are installed on the outlet pipe of water pump 605. The coolant outlet of the engineering machinery cooling system (which in this embodiment is the coolant outlet of the power compartment simulation system radiator 618) is connected to the inlet of water tank 601.

[0034] The first pipe heater and the pipe insulation layer constitute a pipe heat compensation device. By setting a pipe heater near the inlet side of the heat medium of the sample under test, adjusting the power of the pipe heater, and monitoring the inlet temperature, the inlet temperature can be quickly reached and stabilized.

[0035] The coolant heating circulation module 6 also includes a rapid drainage circuit and a waste liquid collection circuit in the pipeline. The rapid drainage circuit and the waste liquid collection circuit in the pipeline include: a pump 613; a first valve 609 located between the inlet and outlet of the pump 613; a second valve 610 located between the inlet of the pump 613 and the outlet of the water tank; a third valve 611 located between the outlet of the pump 613 and the outlet of the water tank; a fourth valve 612 located between the outlet of the pump 613 and the outlet of the water tank; and a drain valve 607 located between the common pipeline of the first valve 609 and the third valve 611 and the outlet 606. The rapid drainage circuit and the waste liquid collection circuit in the pipeline share the same pump, and switching between different circuits is achieved through different valve switching combinations, simplifying the circuit layout.

[0036] Before testing, coolant is added through inlet 602. The level gauge 603 determines whether the liquid level in tank 601 meets the test requirements. During testing, drain valve 607, first valve 609, and third valve 611 are closed. Coolant in tank 601 is heated by first electric heater 604. Due to the large volume of tank 601, the heating efficiency of first electric heater 604 is low, and heat loss occurs along the pipeline. Therefore, a first pipeline heater 616 is installed near the inlet of the power compartment simulation system radiator 618. The first electric heater 604 and the first pipeline heater 616 jointly control the coolant inlet temperature. Water pump 605 controls the liquid flow rate. The first flow meter 608 is monitored. The inlet thermometer 614 determines whether the set initial conditions have been met, and then performs relevant tests and records the data. After the test is completed, the liquid in the pipeline needs to be collected back into the water tank 601, and the test specimen is removed to end the test. By closing the second valve 610 and the third valve 611, and opening the first valve 609, the fourth valve 612, and the liquid pump 613, a waste liquid collection circuit is formed in the pipeline to pump the residual liquid in the pipeline and the test specimen back into the water tank 601. When it is necessary to drain the water tank 601, by closing the first valve 609 and the fourth valve 612, and opening the second valve 610, the third valve 611, the liquid pump 613, and the drain valve 607, a rapid drain circuit is formed to quickly drain the liquid in the water tank 601.

[0037] The structure of the pressurized air heating circulation module 7 is as follows: Figure 5As shown, the system includes an air storage tank 701, an air valve 702, an air supply port 703, a pressure regulating valve 704, a Roots blower 705, a bypass air valve 706, a second pipeline heater 707, a second flow meter 708, an inlet pressure sensor 709, an inlet temperature sensor 710, a second inlet / outlet differential pressure transmitter 711, an outlet pressure sensor 712, and an outlet temperature sensor 713. The outlet of the air storage tank 701 is connected to the inlet of the Roots blower 705 via the pressure regulating valve 704. The outlet connection of the Roots blower 705 is also shown. The pressurized air inlet of the mechanical cooling system (i.e., the pressurized air inlet of the test specimen, which in this embodiment is the pressurized air inlet of the power compartment simulation system) is connected to the inlet of the Roots blower 705; the second pipe heater 707 is installed on the outlet pipe of the Roots blower 705; the pressurized air outlet of the engineering machinery cooling system (i.e., the pressurized air outlet of the test specimen, which in this embodiment is the pressurized air outlet of the power compartment simulation system) is connected to the inlet of the Roots blower 705; a bypass valve 706 is installed between the inlet and outlet of the Roots blower 705.

[0038] During testing, the pipeline is connected to the test specimen, the Roots blower 705 is turned on, and the pressure regulating valve 704 is opened and adjusted. The inlet pressure sensor 709 is used to monitor whether the air pressure in the circuit has reached the initial set conditions. Since it takes a long time to precisely adjust the boosted air flow rate through the Roots blower 705, a bypass valve 706 is set. First, the boosted air flow rate is adjusted to near the set flow rate value through the Roots blower 705, and then the opening of the bypass valve 706 is adjusted to quickly adjust the boosted air flow rate to the set value. The boosted air is heated through the second pipeline heater 707. The second flow meter 708, inlet pressure sensor 709, and inlet temperature sensor 710 are used to monitor whether the set initial conditions have been met, thereby conducting relevant tests and recording data.

[0039] The hydraulic oil heating circulation module 8 and the transmission oil heating circulation module 9 have the same structure, such as... Figure 6As shown, taking the hydraulic oil heating circulation module 8 as an example, it includes an oil tank 801, an oil filling port 802, a second electric heater 803, an oil pump 804, an oil drain port 805, a solenoid directional valve 806, a small-range flow meter 807, a large-range flow meter 808, a rapid drainage circuit and a waste liquid collection circuit in the pipeline 809, an inlet oil temperature sensor 810, a third inlet and outlet differential pressure sensor 811, and an outlet oil temperature sensor 812; the oil tank 801 has a built-in second electric heater 803, the outlet of the oil tank 801 is connected to the inlet of the oil pump 804, and the outlet of the oil pump 804 is connected to the inlet of the solenoid directional valve 806; the solenoid directional valve 806... The first outlet is connected to the hydraulic oil inlet of the engineering machinery cooling system (i.e., the hydraulic oil inlet of the test specimen, which in this embodiment is the hydraulic oil inlet of the power compartment simulation system) via a small-range flow meter 807; the second outlet of the electromagnetic reversing valve 806 is connected to the hydraulic oil inlet of the engineering machinery cooling system (i.e., the hydraulic oil inlet of the test specimen, which in this embodiment is the hydraulic oil inlet of the power compartment simulation system) via a large-range flow meter 808; the hydraulic oil outlet of the engineering machinery cooling system (i.e., the hydraulic oil inlet of the test specimen, which in this embodiment is the hydraulic oil outlet of the power compartment simulation system) is connected to the inlet of the oil tank 801.

[0040] Depending on the different testing requirements of the whole machine, the hydraulic oil flow rate varies greatly. To meet the testing requirements of a wide range of flow rates, a variable range flow measurement section is set up, consisting of an electromagnetic reversing valve 806, a small-range flow meter 807, and a large-range flow meter 808. The flow direction of the liquid is controlled by the electromagnetic reversing valve 806. When the flow rate is small, it is measured by the small-range flow meter 807, and when the flow rate is large, it is measured by the large-range flow meter 808. The structure and working principle of the rapid drainage circuit and the waste liquid collection circuit in the pipeline 809 are the same as those of the rapid drainage circuit and the waste liquid collection circuit in the pipeline in the coolant heating circulation module 6.

[0041] The electrical control unit includes an inlet temperature control module, an inlet flow control module, a static pressure control module for the air chamber, a drive fan speed control module, and a multi-nozzle combination control module. The data acquisition unit includes modules for acquiring radiator inlet and outlet temperature data, radiator inlet and outlet flow rate data, radiator inlet and outlet pressure data, loader engine compartment airflow data, air chamber static pressure data, air chamber air temperature data, and laboratory ambient temperature, humidity, and air pressure data.

[0042] In addition to testing the performance of the loader cooling system by installing a loader power compartment simulation system, the engineering machinery cooling system described in this embodiment can also be tested by installing a blower-type loader cooling system (such as...). Figure 2 As shown), install a suction-type loader cooling system and conduct a performance test of the suction-type loader cooling system (e.g. Figure 3 (As shown), install a single fan system to perform single fan performance testing, install a single radiator core system to perform single radiator core performance testing, and install a radiator assembly and fan system to perform radiator assembly and fan matching testing.

[0043] The testing device provided by this invention can realize the overall performance test of the loader cooling system. By simulating the structure of the loader's power compartment, the structures that affect the air volume of the power compartment are placed on the test bench one by one, so as to realize the cooling system structure layout consistent with the whole vehicle. This allows for more accurate testing of the relevant parameters of the whole machine's cooling system, and thus a comprehensive evaluation of the system performance.

[0044] This invention can be easily modified into a fan performance testing bench or a radiator performance testing bench to meet different testing needs; by testing various combinations of different components, the influence between the components in the cooling system can be analyzed, providing reference data for cooling system design.

[0045] Compared with whole-machine testing, the testing method proposed in this invention collects more comprehensive data; the test bench equipment is selected from internationally renowned brands, with high measurement accuracy and good overall system reliability.

[0046] Example 2:

[0047] Based on the testing device for performance testing of engineering machinery cooling systems described in Embodiment 1, this embodiment provides a testing method for performance testing of engineering machinery cooling systems, comprising: installing the engineering machinery cooling system to be tested into an engineering machinery cooling system simulation unit according to the structure and layout characteristics of the engineering machinery cooling system during use; connecting the air outlet of the engineering machinery cooling system to be tested to the movable section of the airflow testing wind tunnel; connecting the heat source simulation unit to the engineering machinery cooling system to be tested according to the test items; controlling the operating status of the engineering machinery cooling system simulation unit, the airflow testing wind tunnel, and the heat source simulation unit respectively through an electrical control unit; and collecting the test parameters of the engineering machinery cooling system simulation unit, the airflow testing wind tunnel, and the heat source simulation unit respectively through a data acquisition unit to form a test dataset for evaluating the performance of the engineering machinery cooling system.

[0048] The performance test of the cooling system of a blower-type loader is conducted. The cooling system of a blower-type loader consists of a blower fan, radiator, hood, and other structures that affect the airflow field, such as the engine block and fuel tank. The blower fan, fan torque and speed sensor, and fan drive motor are connected in sequence. The fan drive motor is covered with an outer cover that simulates the structure of the engine block. The radiator, hood, and fuel tank are placed on support fixtures according to the overall structural layout of the loader to simulate the impact of the structure of the blower-type loader cooling system on the intake and exhaust airflow. Various heat source media are connected to the radiator through pipelines. The inlet temperature, inlet flow rate, and inlet pressure of each heat source medium entering the radiator are adjusted to simulate the thermal load state of the whole machine under working conditions. The air outlet side of the hood is placed in the airflow measurement chamber, and the air inlet and outlet sides of the engine compartment are separated by a partition. The auxiliary fan and damper are adjusted to increase the air intake and make the static pressure of the chamber wall zero, thereby testing the airflow of the engine compartment.

[0049] The performance test of the cooling system of a suction loader is conducted. The cooling system of a suction loader consists of a suction fan, radiator, hood, and other structures that affect the airflow field, such as heat insulation plates and oil tanks. The suction fan, heat insulation plates, fan torque and speed sensors, and fan drive motor are connected in sequence, and the radiator, hood, and oil tank are placed on the support fixture according to the overall structural layout of the loader. This simulates the influence of the suction loader cooling system structure on the intake and exhaust airflow. By adjusting the length of the movable section extending beyond the fixed section, the air outlet side of the power compartment is placed in the airflow measurement chamber, and the air inlet and outlet sides of the power compartment are separated by a partition. The auxiliary fan and air damper are adjusted to increase the intake airflow, so that the static pressure of the chamber wall is zero, thereby testing the airflow of the power compartment.

[0050] The single-fan performance test is conducted by sequentially connecting the fan, fan torque and speed sensor, and fan drive motor, placing the fan inside the air duct, and connecting the other end to the airflow test tunnel, thus modifying it into a fan performance test bench; the fan speed is set to a fixed value, and the static pressure in the air chamber is adjusted by adjusting the speed of the auxiliary fan, and the airflow static pressure characteristic curve of the fan is obtained by testing.

[0051] For single radiator core performance testing, the radiator core is fixed to the front partition, and the heat medium is introduced into the radiator core through pipes. The airflow from the radiator core is adjusted by an auxiliary fan to test the heat exchange performance of the radiator core.

[0052] For the radiator assembly and fan matching test, the radiator assembly was fixed to the front partition with a support fixture. The fan, fan torque and speed sensor, and fan drive motor were connected in sequence and placed at the rear end of the radiator air guide shroud. By adjusting the gap between the fan and the radiator, the influence of the relative position between the fan and the radiator on the airflow was studied. By replacing different radiator air guide shrouds, the influence of the air guide shroud structure on the airflow was studied.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A testing device for performance testing of cooling systems in engineering machinery, characterized in that, include: A simulation unit for cooling systems of construction machinery is used to simulate the structural layout of cooling systems for construction machinery. The air volume test wind tunnel is used to measure the air volume of the cooling system of engineering machinery. It includes a fixed section and a movable section. One end of the movable section is slidably connected to one end of the fixed section, and the other end is connected to the air outlet of the cooling system of engineering machinery. The heat source simulation unit is connected to the engineering machinery cooling system simulation unit and is used to simulate the heat load state of the engineering machinery cooling system during operation. An electrical control unit that is connected to the engineering machinery cooling system simulation unit, the air volume test wind tunnel, and the heat source simulation unit respectively, and controls their operating status; It is a data acquisition unit that connects to the engineering machinery cooling system simulation unit, the air volume test wind tunnel, and the heat source simulation unit respectively, and collects their test parameters. The loader's power compartment simulation system (1) is installed in the engineering machinery cooling system simulation unit, including the hood, radiator, fan, fan speed and torque sensor, fan drive motor, and support fixture, to simulate the loader's power compartment structure layout; the movable section (2), fixed section, air volume measurement chamber (3), auxiliary fan (4), and exhaust pipe (5) are arranged in sequence to form a variable length air volume test wind tunnel; The power compartment simulation system (1) is placed in front of the movable section (2). The length of the movable section (2) extending out of the air volume measurement chamber (3) is adjusted according to the length of the air outlet side of the power compartment simulation system (1). The box (202) of the movable section (2) is nested on the air volume measurement chamber (3). An auxiliary fan (4) and an exhaust pipe (5) are set at the rear end of the air volume measurement chamber (3). The heat source simulation unit is placed on the left side of the air volume measurement chamber (3) to shorten the pipeline length of the heat medium entering and exiting the power compartment simulation system (1). The air volume measurement chamber (3) consists of a static pressure sampling test device (301), an air temperature sampling test device (302), a rectifier device (303), a multi-nozzle combination air volume test device (304), a flow stabilizing device (305), a chamber housing (306), an air valve (307), and a support base (308); The auxiliary fan (4) and exhaust pipe (5) are located at the rear end of the air volume measurement chamber (3) to guide the air from the power compartment to the outside. The heat source simulation unit consists of a coolant heating circulation module (6), a booster air heating circulation module (7), a hydraulic oil heating circulation module (8), and a transmission oil heating circulation module (9). The heat source simulation unit heats the medium to a set temperature through an electric heater to simulate the thermal load state of the loader's working state.

2. The testing apparatus for performance testing of engineering machinery cooling systems according to claim 1, characterized in that, The movable segment includes: Box (202); The front partition (201) is connected to one end of the housing (202) and is adapted to the shape of the engineering machinery cooling system. It is used to separate the air inlet and air outlet of the engineering machinery cooling system, and to make the air inlet located outside the housing (202) and the air outlet located inside the housing (202). The other end of the housing (202) is slidably connected to the fixed section by a side guide device (204) provided on the outside of the fixed section, and a number of rollers (203) are provided at the bottom end of the housing (202).

3. The testing apparatus for performance testing of engineering machinery cooling systems according to claim 2, characterized in that, A rear sealing plate is provided between the housing (202) and the fixed section. The rear sealing plate is used to fill the gap between the housing (202) and the fixed section to prevent air leakage in the air volume test tunnel.

4. The testing apparatus for performance testing of engineering machinery cooling systems according to claim 2, characterized in that, The fixed section includes an air volume measuring chamber (3) and a static pressure sampling test device (301), an air temperature sampling and measuring device (302), a rectifier (303), a multi-nozzle combined air volume test device (304), and a flow stabilizing device (305) installed in the air volume measuring chamber (3). And an auxiliary fan (4) is provided at the end of the air volume measuring chamber (3), the outlet of the auxiliary fan (4) is provided with an exhaust pipe (5), the auxiliary fan (4) is used to draw the air discharged from the air outlet of the engineering machinery cooling system to the outside.

5. The testing apparatus for performance testing of engineering machinery cooling systems according to claim 1, characterized in that, The heat source simulation unit includes a coolant heating circulation module (6), which includes a water tank (601) with a built-in first electric heater (604). The outlet of the water tank (601) is connected to the inlet of a water pump (605), and the outlet of the water pump (605) is connected to the coolant inlet of the engineering machinery cooling system. A first flow meter (608) and a first pipe heater (616) are also installed on the outlet pipe of the water pump (605). The coolant outlet of the engineering machinery cooling system is connected to the inlet of the water tank (601).

6. The testing apparatus for performance testing of engineering machinery cooling systems according to claim 5, characterized in that, The coolant heating circulation module (6) further includes a rapid drainage circuit and a waste liquid collection circuit in the pipeline, wherein the rapid drainage circuit and the waste liquid collection circuit in the pipeline include: Liquid pump (613); A first valve (609) is installed between the inlet and outlet of the liquid pump (613). A second valve (610) is installed between the inlet of the liquid pump (613) and the drain outlet of the water tank. A third valve (611) is installed between the outlet and the discharge port of the liquid pump (613). A fourth valve (612) is installed between the outlet of the liquid pump (613) and the drain port of the water tank. A drain valve (607) is installed between the common pipe of the first valve (609) and the third valve (611) and the drain port (606).

7. The testing apparatus for performance testing of engineering machinery cooling systems according to claim 1, characterized in that, The heat source simulation unit also includes a pressurized air heating circulation module (7), which includes an air storage tank (701). The outlet of the air storage tank (701) is connected to the inlet of the Roots blower (705) through a pressure regulating valve (704). The outlet of the Roots blower (705) is connected to the pressurized air inlet of the engineering machinery cooling system. A second pipeline heater (707) is also installed on the outlet pipeline of the Roots blower (705). The pressurized air outlet of the engineering machinery cooling system is connected to the inlet of the Roots blower (705). A bypass valve (706) is installed between the inlet and outlet of the Roots blower (705).

8. The testing apparatus for performance testing of cooling systems in engineering machinery according to claim 1, characterized in that, The heat source simulation unit also includes a hydraulic oil heating circulation module (8) and a transmission oil heating circulation module (9). The hydraulic oil heating circulation module (8) includes an oil tank (801) with a built-in second electric heater (803). The outlet of the oil tank (801) is connected to the inlet of the oil pump (804), and the outlet of the oil pump (804) is connected to the inlet of the solenoid directional valve (806). The first outlet of the solenoid directional valve (806) is connected to the hydraulic oil inlet of the engineering machinery cooling system through a small-range flow meter (807). The second outlet of the solenoid directional valve (806) is connected to the hydraulic oil inlet of the engineering machinery cooling system through a large-range flow meter (808). The hydraulic oil outlet of the engineering machinery cooling system is connected to the inlet of the oil tank (801). The structural configuration of the transmission oil heating circulation module (9) is the same as that of the hydraulic oil heating circulation module (8).

9. The testing apparatus for performance testing of engineering machinery cooling systems according to claim 8, characterized in that, Both the hydraulic oil heating circulation module (8) and the transmission oil heating circulation module (9) are equipped with a drain circuit and a waste liquid collection circuit in the pipeline.

10. A test method for performance testing of cooling systems in engineering machinery, characterized in that, The method using the testing apparatus for performance testing of engineering machinery cooling systems according to any one of claims 1 to 9 includes: Based on the structure and layout characteristics of the engineering machinery cooling system during use, the engineering machinery cooling system to be tested is installed in the engineering machinery cooling system simulation unit; Connect the air outlet of the cooling system of the engineering machinery to be tested to the movable section of the air volume test wind tunnel; Connect the heat source simulation unit to the cooling system of the engineering machinery to be tested, according to the test items; The operating status of the engineering machinery cooling system simulation unit, the air volume test wind tunnel, and the heat source simulation unit are controlled by the electrical control unit respectively. The data acquisition unit collects test parameters from the engineering machinery cooling system simulation unit, the air volume test wind tunnel, and the heat source simulation unit to form a test dataset, which is used to evaluate the performance of the engineering machinery cooling system.

Images