Electric forklift matching test system and method

Abstract

The invention provides an electric forklift matching test system and method. The system comprises a power supply system, a walking system connected with the power supply system, a working hydraulic system, a control system, a detection system and a test platform used for installing the above systems. According to the system and the method, the walking system or the working hydraulic system of the electric forklift can be independently tested, the walking system and the working hydraulic system which work in a combined mode can also be tested, and then the coupling condition between the walking system and the working hydraulic system is obtained. And the product performance can be calculated more accurately and technical matching can be carried out more reasonably during research and development of the electric forklift, so that the product cost is controlled under the condition that the product quality is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of electric forklift testing, and in particular to an electric forklift matching test system and method. Background Art

[0002] As the only power source for electric forklifts, power batteries not only need to power the travel motors to drive the wheels to move the forklifts during daily operations, but also power the hydraulic motors and provide power for the working hydraulic system to complete operations such as lifting and lowering the forks and tilting the mast forward and backward when the forklifts are moving goods. When the electric forklifts are moving goods, the load and power required by the hydraulic motors will also change with the operation of the mast, causing the current value of the entire system to fluctuate continuously. Such large fluctuations may affect the overall performance of the forklifts, such as unstable driving speed, slow response of the working hydraulic system, and shortened battery life.

[0003] However, the existing test system can only test the travel system or working hydraulic system of the electric forklift and its single components such as the drive axle, motor, gantry, etc., but cannot test the joint working of the travel system and the working hydraulic system, and cannot reflect the coupling between the travel system and the working hydraulic system. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the first aspect of the present application provides an electric forklift matching test system, including a power supply system, a traveling system connected to the power supply system, a working hydraulic system, a control system and a detection system, and a test platform for installing the above systems; The travel system comprises a travel motor, a reduction box and a drive axle which are sequentially connected in transmission, and the output shafts at both ends of the drive axle are respectively connected to load simulation units; The working hydraulic system comprises a hydraulic motor, a hydraulic pump, a hydraulic multi-way valve and a hydraulic cylinder which are sequentially connected in transmission, the hydraulic cylinder is connected to the forklift mast, and the forklift mast is connected to a load block; The control system is electrically connected to the travel system and the working hydraulic system respectively, and is used to control the operating conditions of the travel motor, the hydraulic motor and the hydraulic cylinder; The detection system is connected to the traveling system and the working hydraulic system, and is used to detect performance parameters of the traveling system and / or the working hydraulic system during operation.

[0005] Furthermore, the load simulation unit includes a load motor and a reducer connected between the load motor and the drive axle, and the load motor is connected to a load controller and an independent load power supply.

[0006] Further, the control system includes a traveling motor controller connected between the traveling motor and the power supply system, and a hydraulic motor controller connected between the hydraulic motor and the power supply system.

[0007] Further, the traveling motor controller is connected to a traveling motor operating device in communication therewith, and the hydraulic multi-way valve is connected to a hydraulic multi-way valve operating device.

[0008] Further, the detection system includes at least one first current-voltage sensor connected between the power supply system and the traveling motor, a first torque-rotational speed sensor connected between the output shaft of the drive axle and the load simulation unit, at least one second current-voltage sensor connected between the power supply system and the hydraulic motor, a second torque-rotational speed sensor connected between the hydraulic motor and the hydraulic pump, and pressure-flow sensors between the hydraulic pump and the hydraulic multi-way valve and between the hydraulic multi-way valve and the hydraulic cylinder.

[0009] Further, the hydraulic cylinder includes a lifting cylinder and a tilting cylinder, and the detection system further includes a linear displacement-angular displacement sensor disposed on the forklift mast for measuring the linear speed of the rise or fall of the forklift mast and the angular speed of the forward or backward tilt.

[0010] Further, the power supply system is a power battery, and the detection system further includes a temperature sensor and a discharge current sensor connected to the power battery.

[0011] A second aspect of the present application provides a test method based on the above-mentioned electric forklift matching test system, including the following steps: S1. Control the running of the traveling system through the control system, keep the working hydraulic system in a closed state, and obtain the first traveling performance parameters of the traveling system through the detection system; S2. Keep the running state of the traveling system, and control the running of the working hydraulic system through the control system, and obtain the second traveling performance parameters of the traveling system and the first hydraulic performance parameters of the working hydraulic system through the detection system; S3. Control the traveling system to stop running through the control system, keep the working hydraulic system in a running state, and obtain the second hydraulic performance parameters of the working hydraulic system through the detection system.

[0012] Further, the running of the traveling system includes the traveling motor running according to the first preset running parameters, and the load simulation unit applying a preset load to both ends of the drive axle; The running of the working hydraulic system includes the hydraulic pump working according to the second preset running parameters, and the hydraulic cylinder driving the forklift mast with a load block to move.

[0013] Further, the walking performance parameters of the walking system include the current value and voltage value of the walking system, and the torque value and rotational speed value of the drive axle. The hydraulic performance parameters of the working hydraulic system include the current value and voltage value of the working hydraulic system, the torque value and rotational speed value at the input end of the hydraulic pump, and the hydraulic pressure value and hydraulic flow value at the output end of the hydraulic pump.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: The electric forklift matching test system provided by this application can conduct separate tests on the walking system or the working hydraulic system of the electric forklift alone, or can conduct tests on the combined working walking system and working hydraulic system, so as to obtain the coupling situation between the walking system and the working hydraulic system. This is beneficial for more accurately calculating the product performance and more reasonably conducting technical matching during the research and development of electric forklifts, and further controlling the product cost while ensuring the product quality. Description of the Drawings

[0015] Figure 1 is the flowchart of the electric forklift matching test method of this application; Figure 2 is the structural schematic diagram of the test platform of this application; Figure 3 is the schematic diagram of the principle of the electric forklift matching test system of this application; Figure 4 is the structural schematic diagram of the electric forklift matching test system of this application; 1. Power supply system; 21. Walking motor; 22. Reduction gearbox; 23. Drive axle; 24. Load simulation unit; 241. Load motor; 242. Reducer; 31. Hydraulic motor; 32. Hydraulic pump; 33. Hydraulic multi-way valve; 34. Hydraulic cylinder; 35. Forklift mast; 36. Load block; 41. Walking motor controller; 42. Hydraulic motor controller; 43. Walking motor control device; 44. Hydraulic multi-way valve control device; 51. First current and voltage sensor; 52. First torque and rotational speed sensor; 53. Second current and voltage sensor; 54. Second torque and rotational speed sensor; 55. Pressure and flow sensor. Detailed Embodiments

[0016] In order to facilitate the understanding of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] refer to Figures 2 to 4 As shown, an electric forklift matching test system provided in this embodiment includes a power supply system 1, a traveling system connected to the power supply system 1, a working hydraulic system, a control system and a detection system, and a test platform for installing the above systems; The travel system includes a travel motor 21, a reduction box 22 and a drive axle 23 which are sequentially connected in transmission, and the output shafts at both ends of the drive axle 23 are respectively connected to load simulation units 24; The working hydraulic system includes a hydraulic motor 31, a hydraulic pump 32, a hydraulic multi-way valve 33 and a hydraulic cylinder 34 which are sequentially connected in transmission. The hydraulic cylinder 34 is connected to a forklift mast 35, and a load block 36 is connected to the forklift mast 35. The control system is electrically connected to the travel system and the working hydraulic system respectively, and is used to control the operating conditions of the travel motor 21, the hydraulic motor 31 and the hydraulic cylinder 34; The detection system is connected with the traveling system and the working hydraulic system, and is used to measure the performance parameters of the traveling system and / or the working hydraulic system during operation.

[0018] The test system of the prior art can only test the travel system or working hydraulic system of the electric forklift and single components therein such as the drive axle, motor, mast, etc., but cannot test the joint working of the travel system and the working hydraulic system, and cannot reflect the coupling between the travel system and the working hydraulic system.

[0019] The electric forklift matching test system provided in this embodiment can test the travel system or the working hydraulic system of the electric forklift separately, and can also test the travel system and the working hydraulic system working together, so as to obtain the coupling condition between the travel system and the working hydraulic system. It is beneficial to more accurately calculate the product performance and more reasonably match the technology during the research and development of electric forklifts, so as to control the product cost while ensuring the product quality.

[0020] In some embodiments, the test platform includes a traveling system installation platform, a working hydraulic system installation platform, a gantry system installation platform, and a power system and control system installation platform.

[0021] In some embodiments, the load simulation unit 24 includes a load motor 241 and a speed reducer 242 connected between the load motor 241 and the drive axle 23. Specifically, the number of the load motor 241 and the speed reducer 242 is two. The input shaft of the speed reducer 242 is circumferentially and fixedly connected to the output shafts at both ends of the drive axle 23 through a coupling, and the output shaft of the speed reducer 242 is circumferentially and fixedly connected to the output shaft of the load motor 241 through a coupling. At the same time, the load motor 241 is connected with a load controller and an independent load power supply, so as to avoid the influence of the load motor 241 on the test data by using the power supply system 1. The load simulation unit 24 can control the load motor 241 to apply a force to the output shafts at both ends of the drive axle 23 through the load controller, so as to simulate the loads borne by the traveling system under different working conditions such as no-load, full-load, uphill, downhill or flat driving of the electric forklift.

[0022] In some embodiments, the control system includes a traveling motor controller 41 connected between the traveling system and the power supply system 1, and a hydraulic motor controller 42 connected between the hydraulic motor 31 and the power supply system 1.

[0023] In some embodiments, the traveling motor controller 41 is connected with a traveling motor operating device 43 in communication therewith. The traveling motor operating device 43 is electrically connected to the traveling motor controller 41 in a wired or wireless manner and is used for sending a control instruction for controlling the operation of the traveling motor 21 to the traveling motor controller 41. The hydraulic multi-way valve 33 is connected with a hydraulic multi-way valve operating device 44. The hydraulic multi-way valve operating device 44 controls the movement of the spool of the hydraulic multi-way valve 33, so as to realize operations such as lifting and forward and backward tilting of the forklift mast 35.

[0024] In some embodiments, the detection system includes at least one first current-voltage sensor 51 connected between the power supply system 1 and the traveling motor 21, a first torque-speed sensor 52 connected between the output shaft of the drive axle 23 and the load simulation unit 24, at least one second current-voltage sensor 53 connected between the power supply system 1 and the hydraulic motor 31, a second torque-speed sensor 54 connected between the hydraulic motor 31 and the hydraulic pump 32, and pressure-flow sensors 55 between the hydraulic pump 32 and the hydraulic multi-way valve 33 and between the hydraulic multi-way valve 33 and the hydraulic cylinder 34.

[0025] Specifically, there are two first current-voltage sensors 51, which are respectively arranged between the power supply system 1 and the traveling motor controller 41, and between the traveling motor controller 41 and the traveling motor 21, for testing the current value and voltage value output by the power supply system 1 to the traveling system, and the current value and voltage value input to the traveling motor 21. First torque-rotation speed sensors 52 are respectively arranged between the output shafts at both ends of the drive axle 23 and the input shaft of the speed reducer 242, for real-time monitoring of the torque and rotation speed of the drive axle 23. There are two second current-voltage sensors 53, which are respectively arranged between the power supply system 1 and the hydraulic motor controller 42, and between the hydraulic motor controller 42 and the hydraulic motor 31, for testing the current value and voltage value output by the power supply system 1 to the working hydraulic system, and the current value and voltage value input to the hydraulic motor 31. The pressure-flow sensor 55 is used for detecting the hydraulic pressure value and hydraulic flow value output by the hydraulic pump 32, and the hydraulic pressure value and hydraulic flow value input to the hydraulic cylinder 34.

[0026] In some embodiments, the mast system installation platform includes a mast installation base, and both the hydraulic cylinder 34 and the forklift mast 35 are fixed on the mast installation base. Among them, the hydraulic cylinder 34 includes a lifting cylinder and a tilting cylinder, and the piston rods of the lifting cylinder and the tilting cylinder are both connected to the forklift mast 35, for driving the forklift mast 35 to lift or tilt forward and backward. The detection system also includes a linear displacement and angular displacement sensor arranged on the forklift mast 35, for measuring the linear speed of the forklift mast 35 rising or falling and the angular speed of tilting forward or backward.

[0027] In some embodiments, the power supply system 1 is a two-way power supply or a power battery. Preferably, the power supply system 1 is a power battery. The detection system further includes a temperature sensor and a discharge current sensor connected to the power battery.

[0028] Reference Figure 1 As shown, the present application also discloses a test method based on the above-mentioned electric forklift matching test system, including the following steps: S1. Control the operation of the traveling system through the control system, keep the working hydraulic system in a closed state, and obtain the first traveling performance parameters of the traveling system through the detection system; S2. Keep the traveling system in an operating state, and control the operation of the working hydraulic system through the control system, and obtain the second traveling performance parameters of the traveling system and the first hydraulic performance parameters of the working hydraulic system through the detection system; S3. Control the traveling system to stop operating through the control system, keep the working hydraulic system in an operating state, and obtain the second hydraulic performance parameters of the working hydraulic system through the detection system.

[0029] Among them, the operation of the traveling system includes the traveling motor 21 operating according to the first preset operating parameters, and the load simulation unit 24 applying a preset load to both ends of the drive axle 23; the operation of the working hydraulic system includes the hydraulic pump 32 working according to the second preset operating parameters, and the hydraulic cylinder 34 driving the forklift mast 35 with the load block 36 to move.

[0030] Among them, the traveling performance parameters of the traveling system include the current value, voltage value of the traveling system, and the torque value, rotational speed value of the drive axle 23. Specifically, the current value and voltage value of the traveling system include the current value and voltage value output by the power supply system 1 to the traveling system, and the current value and voltage value input to the traveling motor 21.

[0031] The hydraulic performance parameters of the working hydraulic system include the current value, voltage value of the working hydraulic system, and the torque value, rotational speed value at the input end of the hydraulic pump 32, and the hydraulic pressure value, hydraulic flow value at the output end of the hydraulic pump 32. Specifically, the current value and voltage value of the working hydraulic system include the current value and voltage value output by the power supply system 1 to the working hydraulic system, and the current value and voltage value input to the hydraulic motor 31. The hydraulic pressure value and hydraulic flow value at the output end of the hydraulic pump 32 include the hydraulic pressure value and hydraulic flow value output by the hydraulic pump 32, and the hydraulic pressure value and hydraulic flow value input to the hydraulic cylinder 34.

[0032] In some embodiments, in step S1, it further includes obtaining the first battery performance parameters of the power supply system 1 through the temperature sensor and the discharge current sensor, in step S2, it further includes obtaining the second battery performance parameters of the power supply system 1 through the temperature sensor and the discharge current sensor, and in step S3, it further includes obtaining the third battery performance parameters of the power supply system 1 through the temperature sensor and the discharge current sensor. Among them, the battery performance parameters include the temperature value and discharge current value of the power battery.

[0033] After the test is completed, it is analyzed according to the collected and recorded performance parameters. Specifically, the first traveling performance parameters of the traveling system of the electric forklift operating alone are analyzed with the second traveling performance parameters when the traveling system and the working hydraulic system work together; the second hydraulic performance parameters of the working hydraulic system operating alone are analyzed with the first hydraulic performance parameters when the traveling system and the working hydraulic system 3 work together. To obtain the coupling situation between the traveling system and the working hydraulic system. The first battery performance parameters, second battery performance parameters, and third battery performance parameters of the power supply system 1 are compared and analyzed to study the impact of the combined operation of the traveling system and the working hydraulic system on the performance of the power battery.

[0034] The technical solutions described in this test system and its method can simulate the loads borne by the walking system of an electric forklift under different working conditions such as no-load, full-load, uphill, downhill or flat-ground driving, and can also simulate the working conditions of the rise or fall, forward or backward tilt of the forklift mast 35, and different weight loads; it can complete the individual test of the walking system of the electric forklift or the individual test of the working hydraulic system, and can also test the combined working walking system and working hydraulic system. It is beneficial to more accurately calculate the product performance and more reasonably conduct technical matching during the research and development of electric forklifts.

[0035] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that this application is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed. The scope of protection claimed in this application is defined by the appended claims and their equivalents.

Claims

1. An electric forklift matching test system, characterized in that It comprises a power supply system (1), a traveling system connected to the power supply system (1), a working hydraulic system, a control system and a detection system, and a test platform for installing the above systems; The travel system comprises a travel motor (21), a reduction gearbox (22) and a drive axle (23) which are sequentially connected in transmission, and the output shafts at both ends of the drive axle (23) are respectively connected to load simulation units (24); The working hydraulic system comprises a hydraulic motor (31), a hydraulic pump (32), a hydraulic multi-way valve (33) and a hydraulic cylinder (34) which are sequentially connected in transmission; the hydraulic cylinder (34) is connected to a forklift mast (35); and a load block (36) is connected to the forklift mast (35); The control system is electrically connected to the travel system and the working hydraulic system respectively, and is used to control the operating conditions of the travel motor (21), the hydraulic motor (31) and the hydraulic cylinder (34); The detection system is connected to the traveling system and the working hydraulic system, and is used to detect performance parameters of the traveling system and / or the working hydraulic system during operation.

2. The electric forklift matching test system according to claim 1, wherein, The load simulation unit (24) comprises a load motor (241) and a reducer (242) connected between the load motor (241) and the drive axle (23); the load motor (241) is connected to a load controller and an independent load power supply.

3. The electric forklift matching test system according to claim 2, wherein, The control system comprises a travel motor controller (41) connected between the travel motor (21) and the power supply system (1), and a hydraulic motor controller (42) connected between the hydraulic motor (31) and the power supply system (1).

4. The electric forklift matching test system according to claim 3, characterized in that, The travel motor controller (41) is connected to a travel motor operating device (43) that is communicatively connected thereto, and the hydraulic multi-way valve (33) is connected to a hydraulic multi-way valve operating device (44).

5. The electric forklift matching test system according to claim 1, characterized in that, The detection system comprises at least one first current and voltage sensor (51) connected between the power supply system (1) and the travel motor (21), a first torque and speed sensor (52) connected between the output shaft of the drive axle (23) and the load simulation unit (24), at least one second current and voltage sensor (53) connected between the power supply system (1) and the hydraulic motor (31), a second torque and speed sensor (54) connected between the hydraulic motor (31) and the hydraulic pump (32), and pressure and flow sensors (55) between the hydraulic pump (32) and the hydraulic multi-way valve (33), and between the hydraulic multi-way valve (33) and the hydraulic cylinder (34).

6. The electric forklift matching test system according to claim 1, characterized in that The hydraulic cylinder (34) comprises a lifting cylinder and a tilting cylinder, and the detection system further comprises a linear displacement angular displacement sensor arranged on the forklift mast (35) for measuring the linear velocity of the rise or fall and the angular velocity of the forward or backward tilt of the forklift mast (35).

7. The electric forklift matching test system according to claim 1, characterized in that The power supply system (1) is a power battery, and the detection system further comprises a temperature sensor and a discharge current sensor connected to the power battery.

8. A test method based on the electric forklift matching test system according to any one of claims 1-6, characterized in that, The following steps are involved: S1. Control the operation of the traveling system through the control system. Keep the working hydraulic system in a closed state and obtain the first traveling performance parameters of the traveling system through the detection system. S2. Keep the operation state of the traveling system and control the operation of the working hydraulic system through the control system. Obtain the second traveling performance parameters of the traveling system and the first hydraulic performance parameters of the working hydraulic system through the detection system. S3. Control the traveling system to stop operating through the control system. Keep the working hydraulic system in an operating state and obtain the second hydraulic performance parameters of the working hydraulic system through the detection system.

9. The electric forklift matching test method according to claim 8, wherein The operation of the traveling system includes the traveling motor (21) operating according to the first preset operation parameters, and the load simulation unit (24) applying a preset load to both ends of the drive axle (23). The operation of the working hydraulic system includes the hydraulic pump (32) working according to the second preset operation parameters, and the hydraulic cylinder (34) driving the forklift mast (35) with a load block (36) to move.

10. The electric forklift matching test method according to claim 8, characterized in that The traveling performance parameters of the traveling system include the current value and voltage value of the traveling system, and the torque value and rotational speed value of the drive axle (23). The hydraulic performance parameters of the working hydraulic system include the current value and voltage value of the working hydraulic system, and the torque value and rotational speed value at the input end of the hydraulic pump (32), as well as the hydraulic pressure value and hydraulic flow value at the output end of the hydraulic pump (32).

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