working operation of a jaw crusher

what is a jaw crusher | advantages, types, parts and specifications | quarrying & aggregates

what is a jaw crusher | advantages, types, parts and specifications | quarrying & aggregates

The series of jaw crushers produced by Rayco are widely used in mining and aggregate crushing industries. They are specially developed for crushing the hardest ores and rocks, and are mainly used as primary crushers.

When working, the motor drives the belt and pulley to move the movable jaw up and down through the eccentric shaft. When the movable jaw rises, the angle between the toggle plate and the movable jaw becomes larger, thereby pushing the movable jaw plate closer to the fixed jaw plate, and the material passes through the two jaws. The squeezing and rolling between the plates realize multiple crushing.

When the movable jaw descends, the angle between the toggle plate and the movable jaw becomes smaller. The movable jaw plate leaves the fixed jaw plate under the action of the pull rod and the spring, and the crushed material passes through the discharge port in the lower jaw cavity freely under the action of gravity Unload.

When crushing high hardness and strong corrosive materials, C6X can accomplish the task very well. Its equipment structure, manufacturing technology and material selection determine the high strength of its body. Not only can it be used for coarse crushing of the hardest rocks and ore, but also can be continuously produced in the most demanding production environment on the ground and underground to ensure the maximum production efficiency of customers.

working principle of crushers

working principle of crushers

On left is ashowing of the standard gyratory with straight concaves is a section through any vertical, radial plane in the crushing chamber of one of the intermediate sizes of the crusher. In order to understand the crushing action in such a chamber it is helpful to consider the process as though each step took place in an orderly, and ideal fashion. It is hardly necessary to add that the action never does take place in just that fashion; nevertheless the concept is fundamentally a correct one, and the average performance of the crusher follows the pattern so closely that it is possible to predict, within surprisingly close limits; what any particular design of crusher will do.

Letsstart out by visualizing the crushing chamber filled with a tractable material which will act just the way we want it to, with a head of material (choke-feed) above the receiving opening so that no unsurge of load will occur during the closing stroke of the crusher head. Now, consider any horizontal plane through this body of material as, for example, the plane at the receiving opening, represented by line O in the diagram. The crusher head is at the moment in the close-side position.

As the head recedes on its opening stroke, the body of material moves downward; until, at the end of the stroke, the plane has moved to position 1. Note that the length of line 1 from concave to open-side head position, is the same as that of line O from concave to close-side head position. On the next closing stroke line 1 is compressed by the amount of the bead movement at that level, and on the next opening stroke it moves down to position 2 and so on flown through the chamber, until it becomes short enough to pass through the open-side discharge setting.

We can just as readily visualize the process as being the movement of the trapezoidal areas enclosed by each adjacent pair of horizontal lines and the two crushing faces. Better still, we can consider it as the movement of annular volumes whose cross-sections are the areas just mentioned. This latter conception is essential in visualizing the action of non-choking concaves and crushing chambers.

In the diagram, the broken line through the centre of the crushing chamber is the line-of-mean-diameters of the compacted areas. When the profiles of both crushing facts are straight lines, as in the case under consideration, this mean-diameter line is also straight, and its slope depends upon the relative tapers of the head and concaves. When the line approximately parallels the centre-line of the crusher, which is also the case for the diagram we are examining, the theoretical action closely approximates that of the jaw crusher of similar cross-sectional proportions. Practically, however, the gyratory will have some advantage over the jaw, as regards freedom from choking, because the spider arms of the gyratory pre-vent a complete filling of the crushing chamber at the top. When the line slopes away from the crusher centre-line at its lower end the characteristics change quite definitely in favour of the gyratory, as will be seen.

A variable effort is required between the top and bottom of the chamber to crush particles. This may be understood by comparing the mantle and concaves to a nutcracker. Imagine the spider as the nutcrackers fulcrum point, and your hand as applying power similar to that applied by the eccentric at the base of the main-shaft. The closer to the fulcrum point that the nut is initially cracked, the less power you have to apply with your hand. In the same manner the crushing effort, and demand for power, becomes greater as the centre of gravity of the rock mass moves downward in the crusher.

Gyratory Crushers are heavy-duty machines run in open circuit (sometimes in conjunction with scalping screens or grizzlies). They handle dry run-of-mine feed material as large as 1 m. There are two main types of primary crushers-gyratory crushers and jaw crushers. Gyratory crushers are the most common for new operations.

Secondary crushers are lighter-duty and include cone crushers, roll crushers, and impact crushers. Generally, the feed to these machines will be less than 15 cm, and secondary crushing is usually done on dry feed. Cone crushers are similar to gyratory crushers, but differ in that the shorter spindle of the cone is not suspended but is supported from below by a universal bearing. Also, the bowl does not flare as in a gyratory crusher. Cone crushers are generally the preferred type of secondary crusher because of their high reduction ratios and low wear rates. However, impact crushers are used successfully for relatively nonabrasive materials such as coal and limestone. Frequently, size reduction with secondary crushers is accomplished in closed circuit with vibrating screens for size separation.

The gyratory crusher is used as a primary and secondary stage crusher. The cone crusher is used as a secondary, tertiary, and quaternary crusher. The action of a typical gyratory-type crusher is illustrated above. In gyratory crushers the crushing process comprises reduction by compression between two confining faces and a subsequent freeing movement during which the material settles by gravity until it is caught and subjected to further compression and again released. The particles are subjected to maximum breaking forces when they are on the side with the minimum gape.

Gyratory crushers work on a similar principle to jaw crushers but have a circular gap. Rock is compressed between a static conical bowl and a concave mantle which oscillates about the central axis. These are generally designed for primary crushing in large-scale rock crushing applications up to 6000 t/h. Typically a mining haul truck will empty its load into the gyratory crusher and reduce the feed with a top-size of up to a few meters down to below around 250 mm.

jaw crusher working principle

jaw crusher working principle

Jaw crusher is widely used in industrial and mining enterprises , this is because the aircraft structure is relatively simple , and has a large range of models . Jaw crusher is mainly used as the primary crusher. It can be used with mineral processing equipment, gravel ancillary equipment, it also can be used alone.

Structure of jaw crusher mainly include frame, eccentric shaft, big pulley, flywheel, moving jaw, side guard plate, toggle plate, toggle plate back seat, adjusting screw gap, the reset spring, fixed jaw plate and movable jaw etc. , the toggle plate also play a role as insurance bracket . Working part of jaw crusher is two pieces of jaw plate, one is fixed jaw plate (fixed jaw), vertical (or slightly upper camber) fixed in the front wall of the body, and the other is movable jaw plate (moving jaw), location inclined to form the next big small crushing chamber (working chamber) and the fixed jaw.

Jaw crusher for crushing materials work, is the material between the two pieces of jaw plate crushing. Motor drive transmission mechanism driven jaw plate hanging around the shaft relative to the fixed jaw do periodic reciprocating motion, sometimes close, sometimes leaving in the process of moving jaw plate close to the fixed jaw plate, is the material between the two jaw plates pressed on the subject broken, bent and broken fracturing, the process was moving away from the fixed jaw plate, the material has been crushed under the action of gravity, through the discharge port of discharge.

how to properly install and use jaw crusher | hxjq

how to properly install and use jaw crusher | hxjq

Jaw Crusher is a kind of mining equipment used for primary and secondary crushing. It is widely used in medium-sized crushing of various ores and bulk materials in mining, smelting, building materials, highway, railway, water conservancy, and chemical industries. It has a wide variety and a wide range of uses, making it the perfect choice for mining and quarrying.

Of course, for the customers, in addition to the brand and quality of jaw crusher, the installation and use methods also make them particularly concerned. In order to meet the needs of users and help them solve the most concerned issues, we will talk about how to install and use it next.

From its basic structure, we can easily see that its structure is complicated with many parts. Therefore, during the installation, the user should pay more attention to it and must be installed under the guidance of the manufacturer's technical personnel and in conjunction with the installation and use instructions of the equipment. Pay more attention to the details to ensure that nothing is lost.

Since the working area of the jaw crusher is mostly mountainous, it is necessary to thoroughly investigate whether the topography of the mine is suitable for concrete piling before installation, and according to the site topographic conditions, foundation soil conditions, pile arrangement, and length, and pile frame factors such as ease of movement determine the piling order, and it should also be considered that the depth of the piles should be basically the same, and the foundation soil is even and tight.

The jaw crusher is mainly installed on the concrete foundation. Therefore, the stability of the foundation will affect the stability of the machine. If the foundation is stable, the vibration will be less during the production process, and the equipment can stably run. If not, the jaw crusher will easily generate loud noise and vibration when it is working, which not only affects the production process but also causes the equipment to break away from the foundation. It will have a bad influence on service life, and more importantly, cause personal safety hazards for workers, so the pouring of the foundation is very important.

The jaw crusher is installed on the concrete foundation. In order to reduce vibration and hum, a layer of hardwood, rubber or other vibration-absorptive material should be placed between the frame and the concrete. The horizontal and vertical levels of the frame mounted on the wooden base shall be in accordance with the requirements, and the backing between the frame foot and the soil shall be flat, uniform and stable. Before installing, the sliding bearing is researched and placed and then placed in the bearing housing. The horizontal value and the eccentricity deviation value are measured by the level meter. If the inner diameter is within the allowable range, the eccentric shaft can be placed on the bearing.

Before the shaft and bearing assembly, the sliding bearing needs to be researched and then placed in the sliding bearing housing, and the horizontality and coaxiality of the placement are detected by the level meter. If the measurement result meets the requirements, then install the eccentric shaft on the bearing and check the fit between the shaft and the bearing by applying red dan powder on the journal.

If the surface of the plain bearing is too high, further scraping is required until the high point between the contact surfaces disappears. Finally, a certain amount of lubricating oil is applied between the bearing housing and the bearing to reduce shaft wear. The contact area between the eccentric shaft sliding and the frame should be no less than 80%, and the gap between them should be less than 0.07 mm.

The rod bolt should be assembled after the main bearing and the eccentric shaft are ground. Before assembly, check it carefully, and then use the crane to place the rod bolt slightly lower than its normal position in the crusher. Wash the upper and lower bearings of the rod bolt and lubricate them with thin oil, and then install the bearing, main shaft, upper bearing, and upper shell. Lifting the rod bolt, then install the bolts and tighten them. The bracket should be added when the oil leakage occurs due to poor fitting. When conditions permit, it is best to assemble the complete set of rod bolts and main shaft outside and load them into the frame once with the crane.

The smash or installation of toggle plate can be removed by loosening the tension spring nut, removing the spring, and then using a chain or a wire rope to tie the lower part of the movable jaw plate, and then pulling the wire rope with the driving, so that the movable jaw is close to the fixed jaw, and the rear toggle plate automatically drop off, just inverted repeat the above steps in the installation.

The movable jaw plate is assembled by using the pre-assembled parts, that is, the movable jaws, the movable shaft, the movable dental plate, and the bracket are assembled in advance, and then hoisted in the frame by a crane. The sliding bearing is first ground and placed in the frame bearing housing to measure the deviation of the slope and the coaxiality. Then apply oil to the bearing and journal surfaces and place the movable jaw in the bearing.

The dental plate is the fastest worn part of the crusher and requires frequent replacement. The dental plate is fixed on the front wall and the movable jaw by bolts or wedges. The contact surface must be straight, and no lifting phenomenon is allowed. Otherwise, it should be solved in time. Since the inside of the front wall of the frame is not machined, it is better to lay a layer of the soft metal gasket between the back of the fixed dental plate and the forearm of the frame to ensure that the two are closely fitted.

The above is the installation method for the parts of the jaw crusher. However, in order to make the equipment run stably and maximize the benefits for the user, in addition to the correct installation of the jaw crusher, the rational use is also crucial, which is related to whether the assembled jaw crusher will run in long-term stable production and create a constant value for customers.

Before the jaw crusher is started, the equipment must be thoroughly inspected, for example, to check if the connecting bolts are loose; whether the protective cover of the pulley and the flywheel is intact; whether the tension of the V-belt and the tension spring is appropriate; whetherallthe oil is filled; whether the lubrication system is integrated; whether the electrical equipment and signal system are normal, etc. In addition, before starting the crusher, the oil pump motor and cooling system should be started first. After 3-4 minutes, when the oil pressure and flow indicator are normal, the motor of the crusher can be started.

During operation, attention must be paid to increase ore uniformly, and the ore is not allowed to be filled with crushing chambers. The maximum size of the ore should not be greater than 0.85 times the width of the ore. At the same time, the non-crushing objects such as the shovel teeth of the shovel and the drill bits of the rig are strictly prevented from entering the crusher. Once it is found that these non-broken objects enter the crushing chamber and pass through the discharge port of the machine, the relevant personnel should be immediately notified to take them out in time to avoid entering the next section of the crusher, causing serious equipment accidents;

During the operation, you should always pay attention to prevent the large nuggets from getting stuck in the feeding port of the crusher. If it happens, be sure to use iron hooks to turn the ore; if it needs to be taken out of the crushing chamber, special equipment should be used. It is strictly forbidden to carry out these tasks by hand;

If the crushing chamber is blocked, the ore should be suspended. After the ore in the crushing chamber is broken, the ore can continue to be fed, but the crusher is not allowed to stop running at this time;

Regular inspections should be taken to observe the working conditions and bearing temperatures of the various components of the crusher by means of viewing, listening, and touching. Usually, the bearing temperature must not exceed 60 to prevent the alloy bush from melting or being burnt tile accident. When it is found that the bearing temperature is very high, do not stop the operation immediately. Effective measures should be taken to reduce the bearing temperature in time, such as increasing the oil supply, forced ventilation or water cooling. After the bearing temperature drops, it can be stopped for inspection and troubleshooting;

When the crusher stops, it must be stopped in the order of the production process. First of all, it is necessary to stop feeding the mine. After the ore in the crushing chamber is completely discharged, the crusher and the belt conveyor should be stopped, and then is the motor of the oil pump. It should also be noted that the crusher suddenly stops for some reasons. Before the accident is processed and ready to drive, the accumulated ore in the crushing chamber must be removed. The installation of the jaw crusher and the method of use directly affects the quality of the finished product and the smooth progress of production. Mastering the correct installation and use of the jaw crusher is an effective guarantee for improving the efficiency of crushing work and product quality.

the working principle of a jaw crusher - editors top

the working principle of a jaw crusher - editors top

One of the most commonly used crushing machine is the jaw crusher. It is a heavy-duty machine that is generally used for crushing different kinds of raw materials into smaller pieces. The jaw crushers can be seen in the mining and disposal industry where large rocks need to be crushed into smaller pieces for further use.

The working principle of the jaw crushers is very simple. Powered by a diesel or gas motor, the jaw crusher brakes materials in a crushing chamber. The materials are pushed inside the chamber from the top opening and when crushed they are released through the bottom opening. The crushing power of the jaw crushers depends on the size of the chamber. The bigger the chamber, the more powerful the jaw crusher. The crushing process can be basically explained as a process where the materials are sandwiched between two jaw plates. The movable jaw plates squeeze and crush the materials into several small pieces.

There are two main types of jaw crushers: double toggle and overhead eccentric jaw crusher. The only difference between these two crushers is the location of the pivot joint. In the overhead eccentric jaw crushers, the pivot joint is located at the bottom of the chamber, while at the double toggle crushers, the pivot joint is on the top. The double toggle jaw crushers are more preferred, simply because these crushers are described as fuel-efficient and easy to operate machines.

The jaw crushers can be used for crushing all kinds of hard materials quickly and efficiently. Powerful and highly efficient, the jaw crushers are essential pieces of equipment in the construction and mining industry. They can be used in combination with other crushing machines for more efficient performance. In most cases, the jaw crushers are used as primary crushing machines in projects where high quality materials are not needed.

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