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Injection Molding Machine Ejection Cylinder

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Hydraulic Cylinders

An injection molding machine ejection cylinder is a hydraulic cylinder that is used to push the molded product out of the mold cavity. It is typically located at the bottom of the mold and is connected to the ejector plate. When the cylinder is activated, it pushes the ejector plate up, which in turn pushes the molded product out of the mold.

The injection molding machine ejection cylinder is a critical component of the injection molding machine and must be properly sized and installed to ensure that the molded product is ejected cleanly and efficiently. The size of the cylinder is determined by the size and weight of the molded product, while the installation must take into account the force required to eject the product and the stroke length of the cylinder.

The ejection cylinder for injection molding machine is typically made of steel or aluminum and is finished with a protective coating to prevent corrosion. It is also equipped with a piston seal to prevent fluid leakage. The ejection cylinder is a complex component that requires regular maintenance to ensure that it operates properly. This includes inspecting the cylinder for signs of wear or damage, as well as lubricating the piston seal.

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Injection Molding Machine Ejection Cylinder Specifications:

Product Name Injection Molding Machine Ejection Cylinder
Features: Eject the product formed in the mold
Bore diameter:  90mm~220mm
Rod diameter: 50mm~140mm
Stroke≤600mm
Thrust force: Maximum 760KN
(Bore diameter: 220mm/pressure10MPa)
Applications: Injection Molding Machine

Injection Molding Machine Ejection Cylinder Features:

Injection molding machine ejection cylinders are an essential component of the machine that aids in the removal of the molded part from the mold. Here are some typical features and characteristics of ejection cylinders:

1. Design and Construction: Ejection cylinders are usually designed as hydraulic or pneumatic cylinders. Hydraulic cylinders are more commonly used due to their higher force capabilities. They are typically constructed with a robust outer housing, a piston, seals, and a rod.

2. Force and Stroke: Injection molding machine ejection cylinders are designed to generate sufficient force to eject the molded part from the mold. The force requirement depends on the size and complexity of the part. The stroke length of the cylinder determines the distance the ejector pins or ejector blades can travel to release the part.

3. Mounting: Ejection cylinders are mounted on the injection molding machine, typically near the mold. They are securely attached to the machine frame or the mold itself, ensuring stability during the ejection process.

4. Speed and Acceleration: The injection molding machine ejection cylinder should provide sufficient speed and acceleration to eject the part quickly and efficiently. The speed and acceleration requirements may vary depending on the specific molding process and part geometry.

5. Maintenance and Lubrication: Regular maintenance and lubrication are necessary to ensure the smooth operation of ejection cylinders. Proper lubrication helps minimize friction and wear, extending the lifespan of the cylinder components.

6. Customization: Injection molding machines come in various sizes and configurations, and injection molding machine ejection cylinders can be customized to suit specific requirements. This includes adapting the cylinder dimensions, force output, and stroke length to match the molding machine and the part being produced.

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Injection Molding Machine Ejection Cylinder Working Principle

The ejection cylinder is a component of an injection molding machine that is responsible for pushing the molded part out of the mold. It is typically a hydraulic cylinder that is activated by a piston. The piston is connected to a ram, which is the part that actually pushes the molded part out of the mold.

The injection molding machine ejection cylinder works on the principle of hydraulic pressure. When the piston is activated, it pushes the hydraulic fluid into the cylinder. This fluid pressure then pushes the ram, which pushes the molded part out of the mold.

The ejection cylinder is an important part of the injection molding process. It ensures that the molded part is ejected from the mold cleanly and without damage.

Here are the steps involved in the working principle of an injection molding machine ejection cylinder:

  1. The plastic material is melted in the barrel of the injection molding machine.
  2. The molten plastic is injected into the mold cavity.
  3. The mold closes and the plastic cools and hardens.
  4. The ejection cylinder is activated and pushes the molded part out of the mold.
  5. The molded part is ejected from the machine and is ready for further processing.

The ejection cylinder is a critical component of the injection molding machine and its proper operation is essential for the production of high-quality molded parts.

Here are some of the factors that can affect the working of the ejection cylinder:

  • The viscosity of the plastic material: The viscosity of the plastic material affects the amount of force required to eject the molded part from the mold.
  • The size and shape of the molded part: The size and shape of the molded part also affect the amount of force required to eject it from the mold.
  • The temperature of the mold: The temperature of the mold affects the hardness of the plastic and can make it more difficult to eject the molded part.
  • The condition of the mold: The condition of the mold can also affect the ejection force required. A mold with sharp edges or burrs can make it more difficult to eject the molded part.

If the injection molding machine ejection cylinder is not working properly, it can cause problems with the production of molded parts. These problems can include:

  • Damaged molded parts: If the ejection force is too high, it can damage the molded part.
  • Incomplete ejection: If the ejection force is not high enough, the molded part may not be completely ejected from the mold.
  • Stuck parts: If the molded part is stuck in the mold, it can be difficult to remove and can damage the mold.

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China Injection Molding Machine Cylinder Manufacturers

In 30 years of focusing on innovation, HZPT has reached the forefront of the world’s hydraulic industry in terms of both production scale and technical level. Meanwhile, HZPT is now a widely recognized benchmarking enterprise in the domestic hydraulic industry. Headquartered in Hangzhou, HZPT has founded five hydraulic R&D centers in China, Germany, the United States, Japan, and Mexico, and ten manufacturing bases worldwide. HZPT the establishment of a high-precision foundry and a pump & valve factory, HZPT has mastered the key to developing and manufacturing more advanced hydraulic transmission and control components to supply high-pressure cylinders, hydraulic pump valves, motors, precision castings, and the complete hydraulic system. Well sold in over 20 countries and regions, the products are widely applied in various fields such as mobile machinery, agricultural machinery, industrial engineering, offshore, energy technology, and tunnel boring machines.

HZPT is a company in the R&D and manufacture of hydraulic cylinders. It maintains a leading position in the market segment of hydraulic cylinders in China. In 2020, the domestic market share was around 29%. We produce industrial vehicle hydraulic cylinders, aerial work vehicle hydraulic cylinders, mobile machinery cylinders, industrial engineering hydraulic cylinders, construction machinery hydraulic cylinders, forklift hydraulic cylinders, crane luffing hydraulic cylinders, and sanitation machinery hydraulic cylinders. Hydraulic cylinder is a non-standard product and all products are independently developed by ourselves.

We are one of the best hydraulic cylinders manufacturers. We have exported our products to clients around the world and earned a good reputation because of our superior product quality and after-sales service. We warmly welcome customers both at home and abroad to contact us to negotiate business, exchange information, and cooperate with us!

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