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Qiao Tian's magnetic mold changing system realizes quick loading and unloading of molds through use of both electromagnets and permanent magnets, which not only reduces more than 90% of the mold changing time, but also greatly improves the automation degree of mold changing. It is equipped with a distance sensor and a temperature sensor to monitor the whole mold changing process, and at the same time, through measurement of the magnetic flux, displays the real clamping force in real time, which guarantees safety of the system In terms of arrangement of the poles, the system takes the dynamic mold ejection force into consideration, which makes the safety coefficient and reliability higher. In terms of pole arrangement, Qiao Tian's magnetic mold changing system takes into account the ejection force of moving mold for better safety and reliability.
At present, the product supports the mainstream bus protocols on the market and can be used for remote debugging and control of mobile phones/iPad and other devices. In terms of the internal system bus architecture, the product can realize information interaction among the modules, enabling more convenient expansion and simpler wiring.
Excitation current passes through the excitation coil;
The magnetic pole direction of Alnico electromagnet is changed by the excitation;
NdFeB permanent magnet is magnetically superimposed on the electromagnet Alnico;
The magnetic lines pass through the mold back plate and clamps the mold.
Reverse demagnetizing current passes through the excitation coil;
The direction of the magnetic poles of AlNiCo electromagnet is changed by demagnetization;
The polarity of NdFeB permanent magnet is opposite to and counteracts the polarity of AlNiCo electromagnet;
The magnetic lines form a magnetic circuit inside the magnetic plate and do not apply magnetic force to external objects, releasing the mold.
| System Configuration | ||
No. | Item | Ouantity |
| 1 | Electric permanent magnet board (moving) | 1 |
| 2 | Electric permanent magnet board (fixed) | 1 |
| 3 | Positioning ring | 1 |
| 4 | Temperature sensor | 2 |
| 5 | Distance sensor | 2 |
| 6 | Misoperation detection device | 2 |
| 7 | Magnetic flux detection device | 2 |
| 8 | Power cable | 2 |
| 9 | Communication cable | 2 |
| 10 | Instructions and Maintenance Manual | 1 |
| 11 | HMI system | 1 |
| 12 | Electric control cabinet | 1 |
Basic parameters | |||
| No. | Item | Parameters | |
| 1 | Magnetic pole size (mm) | Φ60 | Φ70 |
| 2 | Attraction force of a single magnetic pole(kg) | 415 | 675 |
| 3 | Magnetic template thickness (mm) | 50 | |
| 4 | Operating temperature (℃) | 120 | |
| 5 | Magnetic penetration depth (mm) | 20 | |
| 6 | Detection limit of proximity sensor (mm) | 0.2 | |
| 7 | Power input | AC220V/380V，50/60Hz | |
| 8 | Applicable clamping force of injection molding machine (KN | 500-44000 | |
| 9 | Inductive transduction accuracy of magnetic induction coil | ±1% | |
The manual screwed pressing plate fixes the mold through manual tightening and loosening of the screws. In this way, the position of the pressing plate and the position of the screws have to be checked each time, resulting on a low degree of automation and inefficient tightening and loosening of screws;
The hydraulic pressing plate clamps the mold through hydraulic fixture, which requires a hydraulic system adapted to the mold. Movement of hydraulic pressing plate is controlled by solenoid valve to control the clamping and releasing of the mold. In this way, the mold backplate has to meet uniform requirements and the mold will become materially deformed and worn due to clamping of the edge.
The mold is attracted and released through use of both electromagnet and permanent magnet. The mold is attracted when there is forward current. Power is not needed during operation. The mold is released when there is reverse current;
Compatible with molds of various specifications and enabling a high degree of automation;
Pipes can be connected freely as there is no peripheral fitting.
| Comparison Dimension | Conventional mold clamping method | Qiao Tian's Magnetic Mold Changing System | |
| Clamping through pressing plate | Hydraulic mold clamping | ||
| Mold Changing Efficiency | Long mold changing time and high labor intensity | Quick | Quick |
| Pressure Distribution | Concentrated pressure points location and force | Concentrated pressure points location and force | Uniform pressure distribution |
| Percentage of Non-defective Products | The mold is easy to deform because the pressure points and force are concentrated | The mold is easy to deform because the pressure points and force are concentrated | Products quality is high. The mold and products are free from deformation. The percentage of non-defective products is high due touniform force on the mold backplate. |
| Power Consumption | Due to the use of manual pressing plate, the positioning of the mold on the injection molding machine is cumbersome, and the whole process requires helf of the bridge crane, resulting in low power consumption. | Power is required to maintain the hydraulic pressure, resulting in high power consumption | Power is only required for magnetization and demagnetization, resulting in lowest power consumption |
| Applicability | Different sizes of molds require different pressing plates and different holes to mount screws, resulting in low applicability | The hydraulic clamping point is fixed regardless of the type of mold, so the mold backplate is fixed, resulting in lowest applicability | The mold can be directly attracted regardless of the size, resulting in excellent applicability |
| Maintenance Cost | High cost of manual maintenance | The hydraulic oil pump must work for a long time, resulting in high energy consumption. Hydraulic oil leakage needs to be dealt with, resulting in high maintenance costs. | No maintenance costs |
