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How to Properly Install and Use Jaw Crusher

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What is jaw crusher for?

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.

What customers care about most?

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.

Firstly, let's take a look at the structural schematic of jaw crusher

Structural schematic of jaw crusher

data from: How to adjust the output size of small rock crusher/small jaw crusher?

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.

Next, let's learn how the components of jaw crusher are installed. 

Before installation: piling

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.

After investigation and determining the geographical location, the next step is the construction of the foundation.

Concrete piling

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.

On installation: installation of components of jaw crusher

Next, we will learn about the installation of jaw crusher from the parts of the frame, eccentric shaft and bearings, rod bolts, brackets, movable jaw plate, and dental plates.

1.The installation of the frame

The installation of the frame

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.

2.The installation of the eccentric shaft and bearing

The eccentric shaft and 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.

3.The installation of the rod bolts

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.

4.The installation of the toggle plate

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.

5.The installation of the movable jaw plate

The movable jaw plate

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.

6.The installation of the dental plate

Installation of the dental plate

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. 

Therefore, users should also clearly understand how the jaw crusher is used.

The operation and use procedures of jaw crusher

1.Preparation before starting

Check before starting

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; whether all the 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.

2.During the running of the machine

  • After starting, if the crusher makes an abnormal knocking sound, stop running, find and eliminate the problem, and then restart the machine;

  • The crusher must be started at no load. After a period of time after starting, it can be opened if it runs normally. The material should be gradually increased until it is fully loaded;

  • 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 running of the machine

  • 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;

  • To ensure the normal operation of the machine, personnel who are not familiar with the operating procedures are not allowed to operate the crusher separately.

3.When the machine is turned off

Turn off the machine

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. 


Steven

Steven is a professional writer in mining industry. He is wise and virtuous with extensive knowledge about this industry. And He will be very happy if he can help you.

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