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Views: 11 Author: Site Editor Publish Time: 2025-06-09 Origin: Site
A full-automatic block forming machine is mainly composed of belt conveyor, vibration forming machine (host), plate feeder, brick discharging machine, palletizer, control cabinet, hydraulic pump station, etc. The vibration forming device is the core part of the block forming machine, and its performance directly determines the quality of the machine itself and the formed blocks. The block forming machine can be divided into table vibrator and mould vibrator according to different action positions of vibration sources. The block former can be driven by electric motor, hydraulic motor and frequency converter.
Motor Drive Disadvantages | Disadvantages of hydraulic motor drive |
Frequent direct start of motor (3~4min), large starting current (5~7 times of rated current), temperature rise (70 ℃), easy melting of bearing grease and damage of motor | The electric energy of the grid is transmitted by the motor-pump-hydraulic valve pipe-hydraulic motor and finally converted into mechanical energy to drive the vibrator to work. There are too many energy conversion and transmission links and the efficiency is low |
When the grid voltage is low, it is difficult to start the motor with load | High cost, large maintenance workload and many vulnerable parts |
High cost, large maintenance workload and many vulnerable parts | Slow pressure rise and low vibration acceleration |
When the motor is directly started, the mechanical impact is large, and the requirements for mechanical accessories are high | When the vibrator does not work, the motor and the oil pump keep idling, wasting electric energy |
Direct drive scheme of frequency converter
Model of block forming machine: QT6 | Model of concrete block machine: 240*115*90 | |
Model of VFD:ES500A-4T22KWGB/30KWPB | Motor model: PCS 7.5KW | |
Data indicators | Data before reconstruction | Data after transformation |
Average production per shift (8 hours) | 1600 | 2200 |
Average Starting Current (Click) | 155A | 45A |
Electrode surface temperature | 75°C | 50°C |
Frequency of vibration | 50HZ | 60HZ |
Roughness of block surface | Rough | Smooth |
It can be seen from the above data that compared with direct drive of motor or hydraulic motor, VFD has obvious advantages, and its characteristics are as follows:
One-to-two control or one-to-four control; Speed command is multi-stage speed control; Use 485 communication multi-terminal speed frequency, and change different frequencies for different brick types to achieve perfect vibration and reduce mechanical loss; The frequency converter adopts V/F control mode; Fast acceleration and deceleration time, saving forming time and increasing production capacity; Small starting current and less impact on power grid
Dynamic braking with external braking resistor; high starting current mitigated by over-current stall prevention function.
The motor starts smoothly with small mechanical impact; Low temperature rise of the motor is beneficial to long-term stable operation of the motor; High energy transfer efficiency and energy saving; Good compactness of masonry molding
The VFD has unique AVR function, which can output sufficient voltage to drive the motor to work in case of low grid voltage
