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There have been many varieties of jaw crushers designed and built since the very first US patent was issued in 1830. They fall into three groups: Blake kind (double toggle), Dodge variety, and single toggle (overhead eccentric). The Blake-type double-toggle crusher and the single-toggle crusher, however, dominate the market.

The double-toggle crusher is preferred for heavy-duty crushing on hard material. It is heavier and more expensive than a single-toggle crusher for a given duty. Justification for selecting a double-toggle crusher will therefore be needed for each application. Some of the factors in this analysis are:

1. Compressive strength of the rock.
2. Work index.
3. Feed size and reduction ratio.
4. Abrasion index.
5. Life of the mine.
6. Capital cost.

jaw crusher

The size of a jaw crusher is measured by its feed opening (gape) and length. For example, 610 by 914 mm (24 by 36 in.), or 2436, indicates a distance of 610 mm (24 in.) from fixed jaw plate to moving jaw plate where the feed enters, and 914 mm (36 in.) is the dimension across the jaw plates.

jaw crushers description
Double-toggle Jaw Crusher—The double-toggle crusher drives the moving jaw through an eccentric shaft, which moves the front and rear toggles up and down at each revolution of the
shaft, closing the jaws on the downstroke and opening them on the upstroke. The toggles are held in the toggle seats by the spring-loaded tension rods. Minor setting changes to the crusher
are made by changing shims between the main crusher frame and the rear toggle block. Major adjustments are made by changing the length of the front toggle.

Crusher Sizing—Jaw crushers are sized on the basis of the maximum lump size to be crushed and/or the tonnage rate to be crushed. Maximum lump size should not exceed 80% of the gape. For example, a 610- by 914-mm (24- by 36-in.), or 2436 crusher, will accept a maximum lump size of 610 by 0.8 = 488 mm (19 in.). In actual operations, the crusher will occasionally accept lumps up to the gape size, as long as bridging does not occur.

In open pit operations, the maximum lump size may be controlled by the size of the shovel dipper. Under these circumstances, a guide to crusher size can be obtained from Table 25.3.1.1.
Approximate capacities of double-toggle jaw crushers are available from crusher manufacturers and are provided in Table 25.3.1.2.

Single-toggle Crusher—This form of crusher is also called an overhead eccentric crusher. Reference to Fig. 25.3.1.2 will illustrate the reason for this name. The overhead eccentric is an
integral part of the moving plate, which moves up and down with the rotation of the eccentric. The single toggle is pivoted at the base of the moving plate and causes the jaw to move in an
arc. This results in a pinching action between the moving and stationary plates. The toggle is held in the toggle seats by the compression spring. Major adjustments to the crusher setting are made by changing the toggle length. Minor adjustments are made by changing shims between the toggle block and the mainframe. The toggle is designed to shear or break in the event tramp material enters the crusher.

The single-toggle crusher is of much lighter construction than the double-toggle Blake-type crushers. For example, a 610 by 914-mm (24 by 36-in.) single-toggle crusher weighs about 14,512 kg (32,000 lb), whereas a double-toggle crusher of the same size weighs 25,678 kg (65,000 lb).

CRUSHER SIZING. Similar to the double-toggle crusher, the single-toggle crushers are selected either on the basis of maximum lump size to be crushed, or the tonnage rate to be crushed, or both.

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Jaw crushers supplier SBM

SBM give probably the most extensive and total lines of rock crushing and reduction equipment for mining minerals and Quarry Aggregate industries, capable of handling several forms of rocks and rock products. SBM high quality jaw crushers deliver youwith smooth operation, extended operation life and minimal fees.

SBM Jaw Crushers embody embody simplicity of style, rugged construction, rigidity of structure, and efficiency of operation, which has produced SBM Jaw Crushers perfect for many crushing operations.The Jaw Crushers are developed for wide range of applications covering stationary or portable crushing and reduction operation, for main or secondary or tertiary rock crushing operation and for either surface or underground configuration.

SBM Jaw Crushers are created to manage the primary or secondary crushing of numerous rock varieties, such as Granite, Gravel, Trap rock, Basalt, Dolomite, Sandstone and similar material.

SBM jaw crusher

SBM supplies complete range of Crushing, Grinding and material handling equipment, covering the total cycle of rock reduction approach.

SBM supples a wide range of Jaw Crushers, designed for many crushing,quarry aggregate applications. SBM Jaw Crushers are supplied in two distinctive ranges.The (JCC) sorts of Jaw Crushers are developed for main stage of crushing and for coarse material.The (JCC)models of Jaw Crushers are created with larger feed opening, longer jaws and bigger crushing strockes,when the (JCF) models are developed with wider feed opening for increase capacity, smaller crushing stroke and shorter jaws, created for fine material, secondary, and tertiary stages of crushing, at the same time as the recycle crushing applications.

SBM Jaw Crushers deliver lower maintenance expense, on account of lower structural stress, simplified designed,and antifriction bearings.

SBM Jaw Crushers are created with the most optimum cavity (Chamber)height ratio in relation towards the feed opening measurements, which ensures minimal blockage,also as by far the most compact style, by eliminating the unnecessary height.The sharp crushing angle outcomes in high crushing ratios.

COARSE JAW CRUSHERS

SBM supply’s eleven models of Jaw Crushers with numerous specifications, designed for stationary or mobile operations, to become configured either as main or secondary crushing unit for limestone , granite, gravel, trap rock, basalt, dolomite, sand stone and similar material.

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a machine for washing gravel or ballast to remove impurities (such as clay and organic inclusions). Gravel-washing machines are divided into drum and trough (cam) types.

Drum gravel-washing machines are for washing gravel with pieces up to 150 mm in size; the drum is driven by an electric motor. The inner surface of the drum has directing blades; at one end there is a feed hole for the material and at the other a discharging hole, through which tubes supply water and washed material is discharged. The running water carries the impurities through the charging hole. The output of drum gravel-washing machines is 40–200 cu m/hr, with a drum diameter of up to 2,500 mm. In some designs, gravel washing-machine drums are fitted with additional sorting devices with perforated surfaces on which the material is fractionated.
jaw plate crusher parts

Trough, or cam, gravel-washing machines are used to wash heavily contaminated materials with piece sizes up to 100 mm; these machines consist of rectangular inclined troughs with blade-equipped shafts rotating in them to mix the material; water flowing against the movement of the material carries off the impurities. The output of trough gravel-washing machines depends on the size and running conditions and is 10 to 125 tons/hr.

Gravel Production Line

Large stone by the hopper evenly sent by the vibrating feeder jaw crusher for primary crushing, crushing stone after the conveyor belt to the crusher for further crushing; stone after crushing by the belt conveyor sent vibrating screen sifting, screening out of several different specifications of the stone, to meet the size requirements of the stones taken from the finished product conveyor belt stockpiles; does not meet the size requirements of the stone material from the conveyor belt to return to Crusher for breaking again to form a closed loop several times. gravel washing machine

Gravel Screening Machine

The feature of vibrating gravel screening machine : a,High capacity b.durability low vibrating noise…. Application: Screen machine.

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Fine Gravel Washing Machine

gravel washing machine 1.reasonable structurer, easy operate and maintain 2.widely uses 3.high capacity and low cost…

Jaw crushers components

1. Frame
§ Heavy-duty design
§ Steel plate welded construction
§ Welded by CO2 shield arc process
§ Pressure relieved after fabrication

2. Crushing Chamber
§ Deep crushing chamber
§ Sharp nip angle ensures high crushing capacity

3. Swing Jaw & Main Bearing Housings
§ Allows removal from frame as an integral sub assembly
§ Permits onsite substitution of a changeover unit in the event of bearing damage
§ Swing Jaw is a robust steel casting with fully machined face to support swing jaw plate

4. Flywheel
§ Balances inertia
§ Promotes smooth operation

5. Eccentric Shaft
§ Forged from hardened and tempered chrome molybdenum steel
§ Particularly large diameters to suit heavy -duty application

6. Bearings
§ Fag or SKF heavy -duty selfaligning double row bearings on swing jaw and main frame
§ Bath oil lubrication ensures positive lubrication
§ Bearing life in excess of 8 years under typical quarry applications

7. Hydraulic Cylinder
§ Allows easy adjustment of discharge setting by moving toggle block to the desired setting

8. Shim
§ Allows easy adjustment of closed side setting

9. Toggle Block
10. Tension Rod with Spring
11. Toggle Seat
§ Allows smooth toggle plate stroke
12. Toggle Plates
§ Designed to shear protecting crusher components if noncrushable object is introduced to crusher (i.e. Steel)

13. Check Plates
§ Manganese steel castings allow easy replacement
14. Jaw Plates
§ High manganese steel castings can be reversed allowing extended life
§ Wedge \ lug system allows easy replacement

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Convenient and secure power packages

Robust design, straightforward handling and cleaning are the features with the BB 100, BB 200 and BB 300 models. For tiny amounts of sample the jaw crushers is usually used batch-wise; for bigger amounts they are able to be operated continuously.

Neutral-to-analysis results are ensured by 4 different varieties of material for the breaking jaws and wearing plates. The interior from the no-rebound feed hopper can’t be accessed by hands. It’s hinged to ensure that the crushing chamber is easily accessible for cleaning. Only several steps are required to exchange the breaking jaws and clean the jaw crusher .

The crushed sample is collected in a removable collector. For bigger amounts or continuous crushing operations, the sample collector is often replaced by customer-specific solutions. Stainless steel and plastic sample collectors are offered for the BB 300.

The grinding chamber is enclosed pretty much dust-tight. To get rid of any fine dust which could contaminate the surroundings, each and every crusher is equipped using a connection for dust extraction; this demands the use of an industrial vacuum cleaner. Unique conversion kits for the central lubrication from the lower movable crushing arm roller bearings are accessible for the BB 200 and BB 300. The is especially advantageous if the jaw crushers are to be utilized continuously or, for instance, if the jaw crusher is built into a processing line in such a way that the lubrication points are tough to access manually.

A safety switch and brake motor make sure an immediate cease if the unit is opened or switched on incorrectly. A Belleville spring washer integrated in the spindle adjustment offers further overload protection. The eccentric spindle which moves the crushing arm is driven by a robust brake motor through V-belts. The largest belt pulley also acts as the flywheel to ensure uniform and smooth operation. Models BB 200 and BB 300 are also readily available as process line versions suitable for inclusion in preparation units.

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The process of construction, mining or quarry workers breaking down enormous stones may be detailed. Several of these efforts depend on the presence of jaw crushers , machines whose style specifications enable for such a laborious and important feat.

Identification

jaw crushers are a potent tool for crushing stone or rock. The specifications will differ based on what form of crusher you are utilizing. One of the main considerations within the construction of jaw crushers will be the metal utilized for the crushing mechanism. It has to possess a breaking point which is considerably higher than the stone or rock it is actually attempting to break down.

Basic Design Specs

jaw crusher

In order for a jaw crusher to work properly, the crusher must have two primary metal pieces. 1 of these does’t move or is “stationary.” The other progresses inward against that piece in order to crush the stone. This will allow the jaw crusher to use each “attrition and compression” to obtain its goal. Two common varieties of crusher contain deep and shallow bodied types, the former becoming developed for higher “rock on rock” crushing.

Reduction Ratio

The jaw crusher operates on the principle situated in a reduction ratio. In other words, there requirements to become a certain balance between the space in the crushing region plus the load or quantity of material introduced into it. Jaw crushers demand a common specification of a six to 1 reduction ratio.

Jaw crushers are employed in quarries, construction sites and other similar applications to break down large pieces of rock. They may be typically the initial step in the reduction procedure, breaking massive rocks into smaller pieces that can be transported or further decreased. Rocks are poured into an opening and funneled between two rigid pieces of metal which can be repeatedly compressed to crush the material to bits. Popular jaw crusher specifications describe size and capacity.

feeder Opening

Feeder opening specifications on a jaw crusher describe the dimensions of the slot into which supplies for crushing are fed. This measurement is commonly expressed in millimeters. Feeder opening specifications differ from firm to corporation. Some producers produce jaw crushers with feeder opening measurements contingent on the size of the individual unit. Other producers endow every crusher with the identical size opening. Such organizations differentiate units rather than differentiating by capacity and overall size. American and British organizations generally express feeder opening measurements in each inches and millimeters.

Maximum Feeding Size

Maximum feeding size specifications describe the largest object a jaw crusher is capable of decreasing. This specification is significant particularly for companies that generate a host of crushers with varying capabilities which have exactly the same feeder opening measurements. It is possible to effortlessly assume that a unit can duly crush any material that may fit by means of the feeder opening. Nonetheless, this is not the case. Rather, maximum feeding size specifications are depending on the starting distance in between the two rigid pieces of metal that do the crushing along with the compression power a unit is capable of producing. Maximum feeding size is usually expressed in millimeters.

Capacity

Jaw crusher capacity specifications express how lots of tons of material a unit is capable of processing per hour. Corporations based in countries that use the metric method automatically list this specification in metric tons per hour. Providers based in nations just like the U.S. or Australia that do not use the metric program express this specification in each brief and metric tons. A brief ton is the typical American ton, or 2000 lbs. The metric ton may be the equivalent of around 1.1 short tons, or 2200 lbs.

Engine Power

Engine power describes specifically that. This measurement is expressed either in horsepower — in countries employing the British system, or in kilowatts — in countries employing the metric system. The capacity of a jaw crusher is contingent upon the power with the engine as it really is the engine that delivers the energy requisite for continued crushing. Maximum feeding size is also directly associated to engine power specifications, as a crusher’s capacity to minimize material is contingent upon the power an engine is capable of creating.

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