Jaw Crusher

What is a jaw crusher?

A “tiger mouth” jaw crusher is a primary crushing device that uses two jaw plates, a movable jaw and a stationary jaw, to simulate the motion of an animal’s jaws. This crushing action compresses, splits, and bends the material entering the crushing chamber, breaking large lumps into smaller particles.

Jaw crushers are essential crushing equipment in industries such as mining, building materials, highways, railways, water conservancy, and chemicals. With a maximum compressive strength of up to 320 MPa, they are widely used for crushing various ores and bulk materials.

Jaw crusher specification

Model	Size of Feeder Opening (mm)	Max. Feeding Size (mm)	Adjustment range (mm)	Processing capacity (t/h)	Over all dimension (mm)	Motor Power (kw)	Weight (t)
PE150×250	150×250	125	10-40	1-3	720×660×850	5.5	0.8
PE200×300	200×300	180	15-50	2-6	910×750×990	7.5	1.2
PE200×350	200×350	180	18-70	3-10	1000×870×990	11	1.5
PE250×400	250×400	210	20-60	5-20	1300×1090×1270	15	2.8
PE400×600	400×600	340	40-100	16-60	1730×1730×1630	30	7
PE500×750	500×750	425	50-100	40-110	1980×2080×1870	55	12
PE600×750	600×750	500	150-200	80-240	2070×2000×1920	55	15.8
PE600×900	600×900	500	65-160	50-180	2190×2206×2300	55	17
PE750×1060	750×1060	630	80-140	110-320	2660×2430×2800	110	29
PE800×1060	800×1060	640	130-190	130-330	2710×2430×2800	110	29.8
PE830×1060	830×1060	650	160-220	150-336	2740×2430×2800	110	30.7
PE870×1060	870×1060	660	200-260	190-336	2810x2430x2800	110	31.5
PE900×1060	900×1060	685	230-290	230-390	2870x2420x2940	110	33
PE900×1200	900×1200	750	95-165	220-450	3380x2870x3330	110	52
PE1000×1200	1000×1200	850	195-265	315-500	3480x2876x3330	110	55
PE1200×1500	1200×1500	1020	150-350	400-800	4200x3300x3500	160-220	100.9
PE1500×1800	1500×1800	1200	220-350	500-1000	5160x3660x4248	280-355	139
PE1600×2100	1600×2100	1500	300-400	1300-2200	6210x4013x4716	350-380	150.6

Fine jaw crusher specification

Model	PEX150×750	PEX250×750	PEX250×1000	PEX250×1200	PEX300×1300
Size of Feeder Opening (mm)	150×750	250×750	250×1000	250×1200	300×1300
Max. Feeding Size (mm)	125	210	210	210	250
Adjustment range (mm)	18-48	25-60	25-60	25-60	20-90
Processing capacity (t/h)	8-25	13-35	16-52	20-61	16-105
Over all dimension (mm)	1200×1530×1060	1380×1750×1540	1560×1950×1390	2140×1660×1500	2720×1950×1600
Motor Power (kw)	15	22	30	37	55
Weight (t)	3.8	5.5	7	9.7	15.6

What is the principle of a jaw crusher?

The working principle of a jaw crusher is that the movable jaw periodically moves toward and away from the fixed jaw, squeezing, splitting, bending, and impacting the material entering the crushing chamber.

During crushing, the motor drives a belt and pulley, which, via an eccentric shaft, moves the movable jaw up and down. As the movable jaw rises, the angle between the toggle plate and the movable jaw increases, pushing the movable jaw toward the fixed jaw. Simultaneously, the material is crushed or split, achieving the desired crushing effect.

As the movable jaw descends, the angle between the toggle plate and the movable jaw decreases. The movable jaw, acting on the pull rod and spring, moves away from the fixed jaw, and the crushed material is discharged from the lower opening of the crushing chamber. As the motor continuously rotates, the movable jaw of the crusher performs cyclical motion, crushing and discharging material, enabling mass production. The crushed material is discharged from the discharge opening by its own weight or the downward thrust of the swinging jaw.

Structural composition of jaw crusher

The jaw crusher is mainly composed of movable jaw, liner, thrust plate, fixed jaw plate, side guard plate, frame, eccentric shaft and spring pull rod.

(1) Frame:

It is a three-dimensional frame structure composed of the front wall, rear wall, bearing seat and two side walls. It is used to support the main shaft, movable jaw, fixed jaw and the reaction force during crushing. Since the structural strength and rigidity of the frame have a considerable impact on the performance of the whole machine and the service life of the main parts, the structure is divided into integrally cast frames and assembled frames.

(2) Moving  jaw:

The working surface of the movable jaw is equipped with a particle plate (crushing plate), which is generally cast with ZG45 or ZG35. The upper part is supported by the eccentric shaft and the lower part is supported by the thrust plate. Its working surface is equipped with a toothed crushing plate fastened with bolts. The installation angle of the movable jaw is usually 15 degrees to 25 degrees.

(3) Crushing lining:

It includes the movable jaw plate, fixed jaw plate and side guard plates on both sides. In the actual production process, the crushing working surface of the jaw crusher is mainly on the tooth surface of the movable jaw plate and the fixed jaw plate.

The tooth surface on the lining plate is in direct contact with the crushed material and is subjected to considerable impact and extrusion during the crushing process. This causes the lining plate to be easily worn or even broken, and is a vulnerable part of the crusher. Therefore, the material mostly used is high manganese steel, which has good wear resistance.

(4) Eccentric shaft:

The pulley and flywheel are installed at both ends of the eccentric shaft, and at the same time support the movable jaw, withstand huge bending and torsion forces, and act as a crank.

(5) Thrust plate:

It is a component that supports the movement of the movable jaw and transmits the generated crushing force to the rear wall of the frame. An adjustment device is installed at the end of the thrust plate. One end of the thrust plate is hinged to the movable jaw, and the other end is connected to the adjustment device at the rear end of the frame. Usually, the thrust plate can be cast in cast iron as a whole or divided into two parts.

(6) Flywheel:

It is an energy storage element that can store or release energy in the form of kinetic energy. The flywheel installed on the crusher can ensure the smooth movement of the machine under high-speed and high-intensity operation and reduce the vibration of the machine.

(7) Adjustment device:

This device is used to adjust the size of the crusher discharge port. The discharge port size is regularly adjusted according to the adjustment device to meet the particle size requirements of the material crushing. According to the different particle size requirements of the material to be obtained, the size of the discharge port is also adjusted accordingly.

(8) Support:

It includes bearings for supporting the eccentric shaft and bearings for supporting the movable jaw. For most medium and small jaw crushers, the bearings can be sliding bearings or rolling bearings. Usually, the support of the movable jaw is often made of sliding bearings.