CN202297041U - Hydraulic pump control system for electric forklift - Google Patents

Abstract

The utility model discloses a hydraulic pump control system for an electric forklift. The hydraulic pump control system is provided with a motor controller, a motor position sensor, pressure sensors and a temperature sensor, wherein a high-power permanent magnet brushless motor controller is adopted for the motor controller; a power output wire of the high-power permanent magnet brushless motor controller is correspondingly connected with a power wire of a permanent magnet brushless direct current motor; the pressure sensors are arranged in oil channels of a gantry elevating hydraulic cylinder, a gantry inclined hydraulic cylinder and a steering booster cylinder respectively; and the signal output end of each pressure sensor is connected with the motor controller through a signal processing module. In the hydraulic pump control system, the pressure sensors are arranged, an enclosed loop is formed in the hydraulic system, the motor speed and the oil consumption can be automatically balanced by using the pressure sensors and the high-power permanent magnet brushless controller according to the reaction of a hydraulic loop, so that electric energy is saved. The hydraulic pump control system has the advantages of high power utilization ratio and no voltage peak value, so that the reliability of the entire electric forklift is improved, and the service life of the forklift is prolonged.

Description

Hydraulic pump control system for electric forklift

technical field

The utility model relates to an electric forklift, in particular to a hydraulic pump control system for the electric forklift.

Background technique

Electric forklifts generally use a separate motor to drive the gear pump to provide hydraulic power for the lifting and tilting of the mast working system. At present, domestic forklifts do not realize the speed regulation of the hydraulic motor. After the hydraulic motor is started, it can only rotate at a high speed and will not automatically adjust with the change of function and pressure. The excess flow can only flow back to the fuel tank through the overflow valve. cause energy waste.

Contents of the invention

The purpose of this utility model is to provide a hydraulic pump control system for electric forklifts. The hydraulic pump control system for electric forklifts needs to solve the problem that the hydraulic motor in the prior art will not change with the function and pressure. However, automatic adjustment causes energy waste and low utilization rate technical problems.

The purpose of this utility model is achieved through the following technical solutions: the electric forklift is equipped with a hydraulic pump, the hydraulic pump is driven by an electric motor, and the pressure oil of the hydraulic pump passes through the electromagnetic valve and the mast lifting hydraulic cylinder, the mast tilting hydraulic cylinder and the steering The power-assisted hydraulic cylinder is connected, and the feature is that the motor is a permanent magnet brushless DC motor. The hydraulic pump control system is also equipped with a motor controller, a motor position sensor, a pressure sensor and a temperature sensor. The motor controller adopts a high-power permanent magnet Brushless motor controller, the power output line of the high-power permanent magnet brushless motor controller is correspondingly connected with the power line of the permanent magnet brushless DC motor. There are pressure sensors in the oil circuit respectively. The signal output end of the pressure sensor is connected with the motor controller through the signal processing module to control the motor power to realize the intelligent management of the motor power. The motor position sensor and temperature sensor are embedded in the permanent magnet In the brushed DC motor, the signal output terminals of the motor position sensor and the temperature sensor are connected with the motor controller to realize the control of the motor's speed, torque, temperature and current by the controller.

The signal processing block is an analog-to-digital converter.

The hydraulic pump control system also includes a motor energy recovery system, which is composed of a permanent magnet brushless motor controller 7, a storage battery 11 and a permanent magnet brushless DC motor 2. The permanent magnet brushless DC motor 2 is The potential energy of the goods makes the hydraulic pump 1 reverse, and the hydraulic pump drives the permanent magnet brushless DC motor 2. At this time, the permanent magnet brushless DC motor becomes a generator, and the output electric energy is processed by the permanent magnet brushless motor controller and returned to the battery.

Compared with the prior art, the utility model has positive and obvious effects. The hydraulic pump control system used for electric forklifts is equipped with a pressure sensor, so that the hydraulic system forms a closed loop. The pressure sensor and the high-power permanent magnet brushless controller can automatically balance the motor speed and oil consumption according to the response of the hydraulic circuit. , so as to save electric energy. The advantages of this control are high power utilization, no voltage peak, low noise of the hydraulic system, and low wear of hydraulic components, which greatly improves the reliability and service life of the vehicle.

Description of drawings

Fig. 1 is the control schematic diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail through embodiment.

As shown in Figure 1. The electric forklift is provided with a hydraulic pump 1, the hydraulic pump 1 is driven by the electric motor 2, and the pressure oil of the hydraulic pump 2 is connected with the mast lifting hydraulic cylinder 3, the mast tilting hydraulic cylinder 4 and the power steering hydraulic cylinder 5 through the solenoid valve. The feature is that the motor is a permanent magnet brushless DC motor 2, and the hydraulic pump control system is also provided with a motor controller 6, a motor position sensor 7, a pressure sensor 8 and a temperature sensor 9, and the motor controller 7 adopts a high-power permanent magnet The brushless motor controller, the power output line (U, V, W line) of the high-power permanent magnet brushless motor controller 7 is correspondingly connected with the power line (U, V, W line) of the permanent magnet brushless DC motor. A pressure sensor 8 is respectively arranged in the oil circuit of the mast lifting hydraulic cylinder 3, the mast tilting hydraulic cylinder 4 and the power steering hydraulic cylinder 5, and the signal output terminals of the three pressure sensors 8 communicate with the motor controller through the signal processing module 10 6 are connected to control the motor power to realize the intelligent management of the motor power. The motor position sensor 7 and the temperature sensor 9 are buried in the permanent magnet brushless DC motor 2. The signal output terminals of the motor position sensor 7 and the temperature sensor 9 are connected with the motor control The controller 6 is connected to realize the control of the speed, torque, temperature and current of the motor by the controller.

The signal processing block is an analog-to-digital converter.

The hydraulic pump control system also includes a motor energy recovery system, which consists of a permanent magnet brushless motor controller 7, a storage battery 11 and a permanent magnet brushless DC motor 2. The potential energy of the hydraulic pump reverses, and the hydraulic pump drives the permanent magnet brushless DC motor. At this time, the permanent magnet brushless DC motor becomes a generator, and the output electric energy is processed by the permanent magnet brushless motor controller and returned to the battery 11 . the

Of course, a pressure sensor can also be used, and in this case the pressure sensor needs to be arranged on the general circuit of the hydraulic system.

Claims (3)

1. hydraulic pump control that is used for electri forklift; Be provided with Hydraulic Pump in this electri forklift; Hydraulic Pump is by direct motor drive; The pressure oil of Hydraulic Pump links to each other with door frame lifting hydraulic cylinder, door frame hydraulic tilt cylinder and power steering hydraulic actuating cylinder through electromagnetic valve; It is characterized in that: this electrical motor is a permanent-magnet brushless DC electric machine; Also be provided with electric machine controller, motor position sensor and pressure sensor and temperature sensor in this hydraulic pump control, electric machine controller adopts superpower permanent magnetic brushless controller, and the power supply output line correspondence of superpower permanent magnetic brushless controller links to each other with the power lead of permanent-magnet brushless DC electric machine; In the oil circuit of door frame lifting hydraulic cylinder, door frame hydraulic tilt cylinder and power steering hydraulic actuating cylinder, be respectively equipped with pressure sensor; The signal output part of this pressure sensor links to each other with electric machine controller through signal processing module, carries out the control of power of motor is realized the intelligent management of power of motor, and motor position sensor and temperature sensor are embedded in the permanent-magnet brushless DC electric machine; The signal output part of motor position sensor and temperature sensor links to each other with electric machine controller, realizes that controller is to rotating speed of motor, moment of torsion, temperature and current control.

2. the hydraulic pump control that is used for electri forklift as claimed in claim 1 is characterized in that: signal processing module is an A and D converter.

3. the hydraulic pump control that is used for electri forklift as claimed in claim 1; It is characterized in that: also comprise the motor power recovery system in this hydraulic pump control; It comprises by permanent magnetic brushless controller, storage battery and permanent-magnet brushless DC electric machine and constituting; Permanent-magnet brushless DC electric machine potential energy owing to goods when door frame falls makes the Hydraulic Pump counter-rotating; Hydraulic Pump drives permanent-magnet brushless DC electric machine, and the permanent-magnet brushless DC electric machine of this moment becomes electrical generator, and the electric energy of output is handled by the permanent magnetic brushless controller and returned storage battery.