The spring cone crusher spring safety device is not perfect. In the production practice, it often fails to play the insurance role, which is easy to cause major accidents such as broken shaft, and the adjustment of the discharge port is very inconvenient. To this end, hydraulic cone crushers are commonly used in foreign countries. The hydraulic technology is applied, the hydraulic positioning mechanism is adopted, the work is reliable, and the unbreakable objects such as iron pieces are automatically eliminated. The hydraulic system plays the three roles of supporting the crusher cone, adjusting the discharge port and achieving overload protection. The hydraulic cone crusher can adjust the discharge port and eliminate the non-crushed material in about 1 minute. It can be seen that it is more advanced than the spring cone crusher.
Hydraulic cone crushers are available in single and multi-cylinder versions.
Figure 2-8 shows the bottom single-cylinder hydraulic cone crushing mechanism. The lower end of the main shaft of the movable cone 3 is inserted into the eccentric bushing 4 and supported on the spherical disk above the cylinder piston; the high pressure oil is passed under the piston for supporting the piston. Due to the rotation of the eccentric bushing, the moving cone acts as a cone.
The operation principle of the bottom single cylinder hydraulic cone crusher is shown in Figure 2-9.
The mass of the vertical shaft 1 and the moving cone 2 of the crusher is all supported by the oil pressure inside the hydraulic cylinder, and the hydraulic system includes the hydraulic cylinder 3, the hydraulic tank 4 and the accumulator 5. The hydraulic accumulator is filled with nitrogen higher than the required oil pressure. When the discharge port needs to be increased, the oil in the lower hydraulic cylinder can be put back into the hydraulic tank. At this time, the moving cone is lowered and the discharge port is discharged. Increase. Conversely, if the discharge port is to be reduced, the oil can be pressed from the hydraulic tank to the hydraulic cylinder to raise the moving cone. When the non-broken object falls into the crushing chamber, the hydraulic pressure of the oil passage is greater than the nitrogen pressure of the accumulator, the piston of the accumulator will compress the nitrogen gas, the oil enters the accumulator, the piston in the hydraulic cylinder drops, and the moving cone also drops, so The discharge opening is increased to allow the non-crushed material to be discharged, thereby achieving insurance. After the object is discharged, the oil pressure is lowered, so that the nitrogen pressure is higher than the oil pressure, and the oil entering the accumulator is pressed back to the oil circuit and returned to the hydraulic cylinder, so that the moving cone rises and returns to normal. In addition, the oil pressure in the oil passage can be adjusted by the valve, and the hydraulic pressure can be used to grasp the change of the oil pressure in the hydraulic cylinder. The size of the discharge port can be adjusted according to the production requirements according to the readings on the pressure gauge.
The single-cylinder hydraulic cone crusher is easier to automate the crushing process. Its quality is lighter, the parallel belt of the crushing chamber is longer, and the product granularity is relatively uniform. However, the installation and maintenance requirements of the equipment are strict and precise.
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