Simulated working condition testing device for descending power generation of hybrid forklift

Abstract

The utility model relates to the technical field of forklifts, and discloses a simulation working condition testing device for descending power generation of a hybrid forklift, which comprises a power rack and a forklift body, and a variable frequency motor, a rotating speed torque instrument and a pump motor are fixed on the surface of the power rack; the forklift body comprises a multi-way valve, an oil tank and a portal frame lifting system which are arranged in the forklift, and a reversing valve is installed between the oil tank and the pump motor. The device is convenient to construct and wide in test range.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a simulated working condition testing device for descending power generation of a hybrid forklift. Background Art

[0002] The performance of the hydraulic system of the forklift's descending power generation (including key components - pump motor) is usually tested with the whole vehicle, and the descending power generation condition test is also not met by ordinary pump test benches, because the test bench needs to be equipped with a motor that can recover energy, an electronic control system, and a mast lifting system;

[0003] The gantry lifting system of the hybrid vehicle is borrowed from other models, but the electronic control of the hybrid forklift is relatively complex. It takes into account both energy saving and forklift performance improvement. The debugging cycle of control parameters is relatively long, and the control parameters of the descending power generation module are more closely related to the actual working conditions. It is urgent to design a test method to simulate the working conditions and test the performance parameters of the descending power generation before the development of this module, and provide the parameters required for the development of the electronic control module. In order to solve the problem of how to quickly implement the test and obtain the required parameters, a simulated working condition test device for the descending power generation of a hybrid forklift is designed. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a simulated working condition test device for descending power generation of a hybrid forklift, which is easy to build and has a wide test range.

[0005] The simulated working condition test device for descending power generation of a hybrid forklift proposed in the utility model comprises a power bench and a forklift body, and a variable frequency motor, a speed torque meter and a pump motor are fixed on the surface of the power bench;

[0006] The forklift body comprises a multi-way valve, an oil tank and a mast lifting system arranged inside the forklift, and a reversing valve is installed between the oil tank and the pump motor.

[0007] Preferably, a P circuit and a T circuit are connected between the pump motor and the forklift body.

[0008] The beneficial effects of the present invention are:

[0009] 1. This simulated working condition test device is easy and quick to build. The whole vehicle test method of the descending power generation module equipped with a forklift is carried out by detecting the pressure, flow rate of the pump and the current and voltage of the electronic control system. The energy and efficiency of the pump work (lifting / lowering) can be calculated through data processing, and data testing can be quickly realized.

[0010] 2. This simulated working condition test method can adopt a variety of test methods, including lifting and lowering states, motor and electronic control operation modes, test methods, etc., with a wide test range. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of the simulated operating condition test device for descending power generation of a hybrid forklift proposed in the utility model.

[0012] In the figure: 1. Variable frequency motor; 2. Speed ​​torque meter; 3. Pump motor; 4. Reversing valve; 5. Forklift body. DETAILED DESCRIPTION

[0013] Reference Figure 1 , a simulated working condition test device for descending power generation of a hybrid forklift, including a power bench and a forklift body, a variable frequency motor, a speed torque meter and a pump motor are fixed on the surface of the power bench, and the variable frequency motor has a braking function;

[0014] The forklift body includes a multi-way valve, an oil tank and a mast lifting system arranged inside the forklift, and a reversing valve is installed between the oil tank and the pump motor.

[0015] There are P circuit and T circuit connected between the pump motor and the forklift body. The P circuit is the power oil circuit and the T circuit is the inlet / return oil circuit.

[0016] The test device is equipped with a variable frequency motor with braking function and a control system that converts braking torque into electrical energy. The power bench and electronic control system of the existing transmission test bench can be borrowed. The test device also requires a gantry lifting system. The gantry system of the hybrid vehicle is a borrowed part. The existing vehicle with the same gantry configuration can be used to replace the gantry system required by the test bench. The working pump is installed on the power bench. Other components required for the hydraulic system (such as the fuel tank) are borrowed from the existing vehicle, and the multi-way valve used for this model is replaced by a multi-way valve for hybrid. The conversion module required for descending power generation is added to the test pipeline system. In order to obtain a specific lifting / lowering speed, the electronic control system sets a certain motor speed, and then controls the outlet / inlet flow of the pump motor to obtain the corresponding lifting / lowering speed.

[0017] The method for testing the simulated working condition of the hybrid forklift descending power generation is characterized in that: three detection points are provided, point A: speed / torque test point;

[0018] Point B: Pump port pressure / flow test point;

[0019] Point C: cylinder bottom pressure / flow test point;

[0020] The test steps include:

[0021] S1: Raise / lower the mast at full speed under the following load conditions and test these two conditions:

[0022] No load 20% load 30% load 50% load 70% Full Fully loaded

[0023] S2: Lifting state: The motor inverter in the electronic control system is adjusted to the driving state, the speed of the variable frequency motor is set to the required speed for full-speed lifting, the motor is started, and the multi-way valve in the forklift body is turned to the lifting position. The pump motor draws oil from the oil tank of the reversing valve, and outputs power oil to the lifting cylinder of the forklift body through the reversing valve and the multi-way valve of the forklift body. The mast is lifted to the top, and relevant data are tested;

[0024] S3: Lifting to top state: After the mast reaches the top, the multi-way valve is in the middle position and the motor stops;

[0025] S4: Descending state: The motor inverter in the electronic control system is adjusted to the braking state, the speed of the variable frequency motor is set to the required speed for full-speed descent, the motor is started, the multi-way valve in the forklift body is moved to the descending position, the mast descends, the pressure oil drives the pump motor to rotate, and drives the motor to rotate, the motor provides braking torque and works at the speed set by the inverter. In this working mode, the motor generates electricity, and the generated current flows into the power grid through the inverter and the dedicated energy feedback device;

[0026] S5: The test data is as follows:

[0027]

[0028] S6: Energy conversion efficiency at the motor = (pump torque T*speed ω) / (motor port pressure P1*motor port flow Q1);

[0029] S7: Based on the test data under different loads, the lifting / lowering energy consumption and recovery amount can be calculated for the hybrid forklift's electronic control system to formulate control strategies.

Claims

1. A test device for simulating the working condition of a hybrid forklift descending and generating electricity, characterized in that: It includes a power bench and a forklift body, and a variable frequency motor, a speed torque meter and a pump motor are fixed on the surface of the power bench; The forklift body comprises a multi-way valve, an oil tank and a mast lifting system arranged inside the forklift, and a reversing valve is installed between the oil tank and the pump motor.

2. The hybrid forklift descending power generation simulation working condition test device according to claim 1, characterized in that: A P circuit and a T circuit are connected between the pump motor and the forklift body.

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