Jaw crusher installation points and precautions

Jaw crushers are widely used in mining and smelting, building materials, highways, railways, water conservancy and chemical industries. Due to the high hardness of the crushed materials, strong vibrations will occur during work. Therefore, the early installation work is very important. Today Zhongyuan editor will introduce the installation points and precautions of the 6 major parts of the jaw crusher.

1. Installation points of jaw crusher

When assembling the jaw crusher, the frame of the crusher needs to be installed on the foundation first, and then the other components are installed in order.

①The installation points of the jaw crusher frame

When installing the crusher frame, pad between the frame and the concrete to reduce vibration, such as hardwood, rubber, etc. The horizontal and vertical horizontality of the frame installed on the foundation or on the wooden base must meet the equipment Installation requirements. When installing the rack, the horizontal and vertical horizontality of its placement on the foundation should be less than 0.2mm.

②The main points of assembly of jaw crusher eccentric shaft and bearing

a. Before assembling the shaft and the bearing, the sliding bearing needs to be researched and assembled, and then placed in the sliding bearing seat, and the levelness and coaxiality of its placement are tested by a level gauge. If the measurement results meet the requirements, Then install the eccentric shaft on the bearing, and check the fit between the shaft and the bearing by applying red lead powder on the journal.

b. Because the bearing needs to use the principle of thermal expansion and contraction during the assembly process, the heating process must be strictly controlled, and the appropriate temperature should be selected for heating of bearings of different specifications and sizes. The outer diameter of the broken jaw bearing is Φ650 and the inner diameter is Φ400. It is a large bearing. It is often heated unevenly during the heating process, which causes the assembly quality to decline. Therefore, we choose to turn the bearing direction 180° to reheat the other surface to ensure uniform heating of the bearing .

c. During the assembly process, it is required to strike the bearing diagonally at the same time to ensure that the bearing enters the eccentric shaft in a balanced manner. When the eccentric shaft enters the movable jaw, we require the jaw to be hit with a hammer, and the eccentric shaft is installed by the interaction force. Enter into the movable jaw without damaging the bearing on the eccentric shaft.

d. Use a grease injector to inject grease into the movable jaw. The grease added into the bearing is about 50% of the space volume. Replace it every 3-6 months. Clean the roller with clean gasoline or kerosene when changing the oil. The raceway of the bearing makes the bearing lubricated sufficiently and evenly, and the bearing is well lubricated under the action of heavy load and high temperature, which prolongs the service life of the broken jaw bearing.

If there are too many high points on the surface of the sliding bearing, it needs to be scraped until the high points between the contact surfaces disappear. Apply a certain amount of lubricating oil between the bearing seat and the bearing to reduce shaft wear, eccentric shaft sliding and frame The contact area between them should not be less than 80%, and the gap between them should be less than 0.07mm.

③The installation points of the jaw breaker connecting rod

After the above parts are installed in place, the connecting rod can be installed. The connecting rod and the required assembly position should be carefully checked before the connecting rod is assembled. After there is no problem, the connecting rod is lifted, and the entire connecting rod is carried out with gasoline or kerosene. After cleaning, apply a layer of oil on the surface of the connecting rod to ensure that it is installed and lubricated. Then put the upper bearing, main shaft, upper bearing and connecting rod upper shell, and then lift the connecting rod, install the connecting rod bolt on the connecting rod and tighten it, for example, after adding a gasket between the upper shell of the connecting rod and the connecting rod, If the fit is not tight and cause oil leakage, the gasket should be processed or new gaskets should be reinstalled. If conditions permit, the whole can be hoisted into the frame by using a crane after assembling the connecting rod and main shaft parts externally.

④The installation points of the broken jaw plate

Loosen the tie rod spring nut, remove the spring, tie the lower part of the movable jaw with a chain or wire rope, and then pull the wire rope to bring the movable jaw close to the fixed jaw, and the toggle plate will automatically fall. After the old toggle is removed, use a wire rope to pull the new toggle into the toggle base so that the toggle and toggle base are in close contact, and then install the pull rod and spring. At this time, the toggle is supported in the toggle base before use The wire rope is pulled by the crane to make the movable jaw close to the fixed jaw, and the rear toggle plate will automatically fall off. You only need to repeat the above steps in reverse during installation.

⑤The installation points of jaw breaking jaw

Assemble the mobile jaw of jaw crusher by using the pre-assembled mobile jaw parts. The mobile jaw parts are assembled first, and the mobile jaw, the movable jaw shaft, the movable tooth plate, the toggle pad, etc. are assembled on the ground. After completion, use a crane or crane to lift the assembled parts into the frame of the crusher.
For sliding bearings, first grind and match the sliding bearings, and then put them into the housing of the frame, and measure the deviation of the inclination and coaxiality. If it is within the allowable range, apply lubricating oil on the surface of the bearing and journal, put the movable jaw in the bearing, and check the concentricity and inclination of the sliding bearing assembly at the same time. The inclination is guaranteed to be 0.2mm. The shaft degree should be less than 0.06mm to complete the assembly of the movable jaw.

⑥ The installation points of the jaw crusher plate

The jaw crusher tooth plate is a component directly used for crushing ore. Its structure is simple. However, due to frequent contact with the ore, the tooth plate is a part that wears quickly in the crusher and needs to be replaced frequently. The cross-sectional structure of the tooth plate has two kinds of smooth surface and lattice surface. Due to its large weight, it needs to be made into a structure that is easy to replace.

The tooth plate is fixed with bolts or wedges, and it is fixed on the front wall of the frame or the movable jaw, and the contact surface between the two must be straight and no warping is allowed. If there is a high point in contact, Need to be processed in time. Since the inner side of the front wall of the frame is not processed, a soft metal gasket is placed between the back of the fixed jaw tooth plate and the front wall of the frame to ensure that the two fit closely.

2. Precautions for installation of jaw crusher

Since the jaw crusher vibrates greatly during work, the machine should be installed on a concrete foundation. In order to reduce vibration, noise and the impact on nearby buildings, a hardwood pad and rubber belt should be placed between the crusher and the concrete foundation. Or other shock-absorbing materials.

The size of the discharge opening should be adjusted according to the required product granularity. When adjusting, loosen the bolt and tighten the spring. Use jacking bolts to open the adjusting seat, insert or remove gaskets of corresponding thickness, and then retract the jacking bolts, and the adjusting seat will be close to the ear seat of the frame under the weight of the movable jaw, and the gasket group will be pressed at the same time. Get together. Afterwards, adjust the spring preload to ensure that the thrust plate and the thrust plate pad are in close contact when the machine is working. However, the pre-pressure should not be too large, so that no knocking sound occurs, and finally lock the adjusting seat.