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YJD Unloader

YJD Unloader
YJD Unloader
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Product Code : 04
Product Description


By keeping track with market development, we are engaged in providing YJD Unloader. This product is used at the discharge port of the unloader working under negative pressure. This product is precisely manufactured making use of high quality factor inputs and ultra-modern techniques according to the set industry parameters. The given product is precisely designed with high precision to meet the set industry quality norms. YJD Unloader is available in assorted technical specifications as per the needs of our customers.


Our offered YJD Unloader is used at the discharge port of the unloader working under negative pressure. The upper part receives the material discharged by the unloader and the rotating impeller acts as a conveyer and is also responsible for sealing to prevent the discharge. During the pneumatic conveying process, the air is sucked from the discharge opening and plays a significant role in the cleaning work.


Working principle

This unloader is commonly used in the pneumatic output system. For pressure output system or negative pressure output system, the unloader can feed the feeding pipe evenly and continuously. In order to ensure that the gas and solids in the pneumatic output pipe are relatively stable, the pneumatic transmission can work normally, and at the same time, the gas pressure of the upper and lower parts of the unloader can be cut off. Therefore, unloader is an important component commonly used in pneumatic conveying systems.

When the material in the upper silo falls and fills in the gap between the blades, it is discharged in the lower part of the unloader as the blade rotates. So, the unloader can discharge quantitatively and continuously.

The temperature of the material it transports is up to 280 °C. Both the ends of the bearing and the impeller are isolated, to prevent contact with the ultra-fine powder and the bearing. At high-temperature the unloader can convey material of up to 500 °C, using sprocket connection.
Composition and alias

The structure is usually composed of a rotor blade, housing, a seal and a speed reducer, an electric motor, etc. The star unloader is also called a rotary feeder, a lock valve, and a discharge type valve, star feeder, etc.



The star unloader can be used in the collection of material systems, as a hopper discharge device. It is currently the most advanced unloading device in the country and is often used as one of the most important equipment of the de-dusting system. It is particularly suitable for dust, small particles, and is preferred by engineering projects in the industrial sectors such as environmental protection, metallurgy, chemical engineering, grain, cement, road construction, and other industrial engineering projects.



  • Compact, good appearance, easy to use
  • Smooth operation, low noise
  • Due to bearings, the gearbox is away from the shell, for high temperature lubrication has been greatly improved
  • Can be manufactured as per the user’s requirement
  • This product is marked with special grease for cycloidal speed reducer before leaving the factory
  • Please check the fuel regularly
  • If the explosion-proof level has higher requirements, explain in advance while ordering



Star unloaders are divided into three types: ordinary type, pressure type, and high-temperature resistant type.

  • Ordinary type: It can be used for normal materials below 80° C and normal temperature. It can continuously and uniformly feed material into the feeding pipe in the system and separating dust collecting part, it can also function as an unloader.
  • Pressure resistant type: It adopts a closed type rotor, which can be widely used in suction type, pressure feeding type air flow conveying system and negative pressure conveying equipment. It can ensure that the air pressure in the conveying pipe does not leak and can safely transport and close the materials; it can not only withstand pressure but also have common features.
  • High-temperature resistant type: The temperature rise has an influence on the expansion of the body, and it is disadvantageous to the bearing and the oil sealing system.



The star unloader device is the main equipment for the dedusting equipment ash discharge, air supply, and other equipment feedings. It is suitable for powdery materials and granular materials. For environmental protection, metallurgy, chemical, food, and other industries use the unloader extensively.

Star unloaders are also known as rigid wheel feeders, star feeders, airlocks, rotary feeders, etc. and are widely used in building materials, metallurgy, and chemical industry, electric power and other departments for various types of dust removal equipment.

Bucket unloading device, which depends on the gravitational effect of the material and the forcible action of the feeder's working mechanism, discharges the material in the bin and feeds it continuously and uniformly to the next device. It can also be used as a variety of grinding machines, hoppers and other equipment is suitable for drying powdery and small-sized materials. According to the required unloading capacity, there are various models of unloading ash valve. The minimum is YJD-02 and the commonly used is YJD- Type 06 and Type YJD-16.

The unloading device is divided into three parts: motor, cycloid deceleration, and dragon-type unloading valve.

  • Adopting the principle of planetary rotation, the input and output shafts is on the same axis, and has the uniqueness of being directly integrated with the motor. Therefore, the structure is compact, attractive, novel, and small in size and light in weight.
  • Superior sealing performance, uniform feed stability, smooth unloading operation, low noise, low failures, long service life, and high wear resistance.
  • Bearing, gearbox is away from the valve body, to avoid the impact of high-temperature dust, the front and rear end caps have good sealing performance, prevent the leakage of dust, and extend the service life of the motorized parts and the lubrication system.
  • Strong overloads capacity, low impact inertia force, suitable for frequent start and reverse rotation.
  • According to the needs of the user, we can configure special motors, such as explosion-proof, FM, speed, marine motors, etc., to meet the special requirements. The material can also be based on users need, such as high temperature, corrosion resistance, stainless steel, flexible blades, and explosion-proof impeller.



  • Before using, check the amount and type of oil in the reducer. After one month of operation, replace new oil and change the oil once in a year.
  • Connect the gas source interface, check whether the interface is blocked by foreign matter, and ensure that the interface is clean and smooth.
  • Make sure that the rotation direction of the rotor is clockwise.
  • Open the sprocket cover to check the tension of the chain. During the operation, check the chain regularly; at the same time, apply appropriate grease to the chain and sprocket.
  • It is advisable to adjust the pressure reducing valve so that the pressure at the seal is greater than the material pressure in the valve body of 0.05 MPa. The gas is oil-free and dry compressed air.
  • The gas source at the seal is always present and the gas source can only be turned off after it is confirmed that the valve is out of service.


Common problems and failures

  • During the transportation and installation process, the unloader should maintain stability, avoid collisions as it may cause the shell to break and deform.
  • The machine has been injected with lubricant oil No. 0 grease before leaving the factory. The unloading valve has been filled with lithium grease. Within 6 to 10 months after use, the transmission and bearing components should be replaced or replaced with grease. If the ambient temperature is high, or high humidity or excessive dust is in the air, the oil change time should be appropriately shortened.
  • During the operation process, avoid overload operation of the equipment due to large particle size and strong adhesive force, or device jamming or motor short-circuit caused by foreign trades in the dust collector, which can result in damage. It is recommended that users promptly check and install the equipment.
  • The machine is suitable for continuous work system, allowing forward and reverse operation.

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