What are the types and functions of safety protection devices for injection molding machines
The safety protection device on the injection molding machine equipment, according to its functions, can be divided into the operators operating safety, mould safety work and hydraulic transmission system safety work of three types of safety protection device.
(1) the operator safety protection device operators in the process of injection molding machine injection molding plastic products production, often with the hand between the two and a half mold parts, clean up the mould remnants and foreign body, sometimes to the mold for debugging.Therefore, there is a safety door at the mold closing part of the injection device.Only when the safety door is closed tightly can the mould be closed. When the safety door is not closed properly or in the open position, the closing action stops.In this case, the mutual restriction of the movement is due to the action of the travel switch and the restriction of the closing mode.Close the safety door and press the mold closing stroke switch, then the mold closing oil cylinder can work. Push the injection seat forward.When the safety door is opened, the closing stroke switch is reset and power is cut off.At this time, the opening limit switch is pressed and closed.If both switches are pressed together at the same time or are not pressed together at the same time, at this time, the safety protection device set here will work and issue the equipment failure alarm.
In order to ensure the mutual restriction and safety of the opening and closing modes, there is also a hydraulic oil circuit stroke switch at the limit switch end.Its function is: only when the safety door is closed strictly, can the reversing valve operate, connect the hydraulic oil of the mold closing cylinder to the oil pipeline, make the cylinder piston move forward and push the elbow connecting rod to the mold.
Note that the travel limit switches shall be installed in the shelter to prevent collision or mispressure.
There is also a red button near the operation desk for emergency parking.
(2) the molding mould work safety protection device injection products with formed mold is injection molding machine and molding parts for production, the structure shape more complex, manufacturing production process conditions demand is high, process is more complicated, so, a plastic injection products with mold manufacturing high prices.If mold damage or malfunction in production, not only affect the quality of injection molding products, sometimes will cause the injection to production work, therefore, mold the use of safety is key protection object.In order to prevent the impact of mold closing, the travel speed of mold closing should be slowed down when the two half die surfaces are close to each other.Clamping, the hydraulic oil of low pressure forces the pistons to move mould clamping, for two and a half mould surface contact after touching the micro switch, clamping cylinder hydraulic oil in the oil pressure increases, two and a half mold surface mold close;When low pressure hydraulic oil moves the pistons during clamping action, if there is foreign body between the two half molds, is two and a half mold can't touch, touch less than micro trip switch, clamping cylinder of the hydraulic oil cannot be booster, unable to high pressure locking mold.This kind of mutual restraint action device can protect the mould from damage.
(3) safety working protection device of hydraulic transmission system
Oil shortage alarm device.To ensure that the movement to cooperate each other parts parts in injection molding machine has the good lubrication condition, to reduce the parts with the wear and tear, prolong the working life of the equipment, guarantee the normal work of the production for a long time.
Circulating hydraulic oil working oil shortage alarm device.Prompt operators to add and replenish the amount of hydraulic oil in time to prevent the insufficient hydraulic oil from affecting the hydraulic transmission.
Oil temperature alarm device for hydraulic oil.The oil temperature of the hydraulic oil is too high, and the viscosity of the oil is reduced, which will affect the hydraulic transmission work and easily damage the working elements in the system.
The alarm device for insufficient oil supply in the oil suction pipeline due to the blockage of oil filter.To prevent the air from mixing into the hydraulic oil to affect the normal operation of the hydraulic oil.