Jaw Crusher

Jaw crusher is commonly known as jaw breaking, also known as tiger mouth. A crushing chamber is composed of two jaw plates, a movable jaw and a static jaw, which simulates the movement of the two jaws of the animal to complete the crushing operation of the material. It is widely used in the crushing of various ores and bulk materials in mining smelting, building materials, highways, railways, water conservancy and chemical industries. The highest compressive strength of the crushed material is 320Mpa.


As far as jaw crushers are concerned, although the structure types are different, their working principles are basically similar, only the moving trajectory of the movable jaw is different. In a nutshell, when the movable jaws make periodic reciprocating movements around the suspension axis to the fixed jaws, sometimes approaching and leaving, the ore is between the two jaws It is broken by the combined action of crushing, splitting and bending and breaking; when the movable jaw plate leaves the fixed jaw plate, the crushed ore is discharged through the ore discharge port of the crusher under the action of gravity.

working principle diagram of jaw crusher
working principle diagram of jaw crusher

Single pendulum principle:

The movable jaw is hung on the mandrel and can swing left and right. When the eccentric shaft rotates, the connecting rod reciprocates up and down, driving the two thrust plates to reciprocate, so as to push the movable jaw to reciprocate left and right to achieve crushing and unloading. This type of crusher adopts a crank double connecting rod mechanism. Although there is a large crushing reaction force on the movable jaw, but its eccentric shaft and connecting rod are not stressed, so it is made into large and medium-sized machines in industry. To break hard materials. In addition, when this crusher is working, the movement trajectory of each point on the movable jaw is an arc centered on the mandrel. The radius of the arc is equal to the distance from the point to the axis. The upper arc is small and the lower arc is large. The crushing efficiency is low, and the crushing ratio is generally 3-6. Because of the simple movement trajectory, it is called a simple swinging jaw crusher.
The simple pendulum jaw crusher has a compact and simple structure, and the transmission components such as the eccentric shaft are less stressed. Because the vertical displacement of the movable jaw is small, the material is less excessively broken during processing, and the wear of the movable jaw plate is less.

Compound pendulum principle:

The upper end of the movable jaw is directly hung on the eccentric shaft. As the connecting rod of the crank connecting rod mechanism, it is directly driven by the eccentricity of the eccentric shaft. The lower end of the movable jaw is hingedly supported on the rear wall of the frame. When the eccentric shaft rotates, the movement trajectory of each point on the movable jaw is changed from the circumferential line of the suspension point (the radius is equal to the eccentric distance), and gradually changes downward into an ellipse. The trajectory of the connection point is an arc. Because the trajectory of each point on the movable jaw in this machine is relatively complex, it is called a complex swinging jaw crusher.
Compared with the simple pendulum type, the compound pendulum type jaw crusher has the advantages of lighter weight, fewer components, more compact structure, better filling degree in the crushing cavity, and evenly crushing the loaded material blocks, and then moving the lower end of the jaw. The finished product discharge is mandatory, so the productivity is higher, which is 20-30% higher than the simple swing jaw crusher of the same specification; the material block has a large up and down rolling motion at the lower part of the moving jaw, which is easy to take the shape of a cube Unload.

JC Series Jaw Crushers:

Compared with traditional jaw crusher, JC series jaw crushers pays more attention on details in the process of design and manufacture. It uses high-strength materials, advanced manufacturing technology, which contributes to the stronger structure, higher reliability, larger crushing ratio, higher productivity, lower cost.

jc service jaw crusher

Raw materials:

River stone, gravel, granite, basalt, minerals, quartz, diabase, etc.


Mining, metallurgy, construction, highway, railroad, and water conservancy, etc.

Max feeding size:




Product Dataļ¼š

Technical Data of JC Series Jaw Crushers:

Model Size of Feed Opening(mm) Discharge Range(mm) Capacity(t/h) Motor Power(kw) Weight (Excluding Motor)(kg)
JC231 510×800 40-150 50-250 55-75 9230
JC340 600×1020 60-175 85-300 75-90 16783
JC3540 650×1060 110-225 120-400 75-90 16783
JC440 760×1020 70-200 120-520 90-110 27303
JC443 850×1100 80-215 170-625 110-160 31522
JC549 950×1250 110-250 260-810 132-160 50325
JC5149 1100×1250 160-300 350-900 132-160 51716
JC555 1070×1400 125-250 360-920 160-200 59773
JC5155 1170×1400 225-350 600-1100 160-200 61845
JC649 1100×1250 125-280 385-920 160-200 55964
JC659 1200×1500 150-350 400-1200 200-250 88311
JC663 1200×1600 150-350 500-1450 220-250 87106
JC771 1500×1800 150-350 600-1800 315-400 126411
JC983 1800×2100 175-350 700-2100 355-450 180000

Features and technology advantages of JC Series Jaw Crushers:

1.Robust structure

There are two types of machine frame: welded model and assembled model. The former is for small and middle size, and the latter is for big size.
The welded type adopts large arc fillet and low stress welding method, greatly reduces the concentration stress which ensures rack equal strength in all directions, high impact resistance, even force, low failure rate.
Assembled uses advanced modularization and non-welded frame structure design of high fatigue strength and high reliability. Meanwhile machine assembly design makes transportation, and installation more convenient, especially suitable for installation in narrow and small places like undermine and high altitude mining.

2.Optimized cavity structure

Symmetrical V formed design, toggle of large obliquity, long stroke, reasonable rotor speed, allow larger materiel block in feeding, higher productivity, homogeneous output granule, less attrition for jaw plate.

3.The whole set of heavy movable jaw plate is durable.

The whole set of heavy movable jaw plate integrates forged heavy eccentric shaft, high quality bearing of heavy loading, the design of movable jaw plate optimized by finite element analysis. These features assure the stroke resistance and stability. Labyrinth seal and centralized lubricating system prevent the greese of bearing not to be contaminated, and assure the easy lubrication which results in longer function and more stability.

4.Protective planch of movable jaw plate

Heavy protective planch installed above the movable jaw plate protects internal bearing from damage caused by material falling down in feeding moment.

5.One piece cast of bearing seat

One piece cast of bearing seat assures good match with frame, and avoids unnecessary radio direction pression for bearing in fastening process which occurs usually to composed bearing seat. Therefore, bearing can function more stably.

6.Fast and easy adjustment of output granularity

JC jaw crusher adopt mechanic or hydraulic device to adjust discharge opening. Compared with shim, adjustment by double block is simpler, saver, faster, and reduces downtime.

7.Installation integrating motor & crusher

Integrative installation of motor chassis and crusher frame not only saves installation space of jaw crusher but also reduces the length of Vee belt. Thanks to synchronous movement of crusher frame, motor chassis and motor. Adjustable motor chassis can realize the adjustment of Vee-belt’s tensile force to make the Vee-belt more durable.

8.Shock absorber installation

The crusher is fixed by the device of special rubber shock absorber, which absorbs effectively the its vibration at the peak point and meanwhile, allows crusher to displace in vertical and horizontal direction. In this way, the shock to foundation would be reduced.

Working principle of JC Series Jaw Crushers:

jaw crusher structural drawing
jaw crusher structural drawing

The motor drives belt and pulley. The movable jaw swings up and down before and after through the eccentric shaft. When the movable pushes the movable jaw plate to the fixed jaw plate, the material is crushed or split into pieces. When the movable jaw and movable jaw plate springs back in the effect of eccentric shaft, the material previously have been crushed discharges from the discharge opening of the lower part. With the motor continuously rotating, the movable jaw breaks and discharges material periodically to achieve mass production.

Compared with traditional jaw crusher, JC series jaw crushers pays more attention on details in the process of design and manufacture. It uses high-strength materials, advanced manufacturing technology, which contributes to the stronger structure, higher reliability, larger crushing ratio, higher productivity, lower cost.