The jaw crusher has the advantages of large production capacity, low energy consumption per unit of output, long life of the liner and large crushing ratio. The mass of a single hammer head is large, and the moment of inertia of the hammer head is large, which overcomes the weakness of the hammer head of other crushers and the high loss of wearing parts, and has the characteristics of large grain size, high crushing ratio and low maintenance cost. Applicable to the crushing of mining, cement, road, railway, coal, metallurgy, building materials and other industries. This series of crushers is becoming the first choice for the crushing industry. When the materials enter the crushing chamber, the bulk materials are piled up on the special middle strips in the machine. After crushing, the particle size is larger than the required material along the tangential direction of the new materials along the hammer. The counter-attack plate is broken again, so that the coarse and medium-breaking pieces are in one step, and finally the materials that meet the requirements are discharged through the integration of the raft plates. The jaw crusher has the advantages of large production capacity, low energy consumption per unit of output, long life of the liner and large crushing ratio. The mass of a single hammer head is large, and the moment of inertia of the hammer head is large, which overcomes the weakness of the hammer head of other crushers and the high loss of wearing parts, and has the characteristics of large grain size, high crushing ratio and low maintenance cost. Applicable to the crushing of mining, cement, road, railway, coal, metallurgy, building materials and other industries. This series of crushers is becoming the first choice for the crushing industry. When the materials enter the crushing chamber, the bulk materials are piled up on the special middle strips in the machine. After crushing, the particle size is larger than the required material along the tangential direction of the new materials along the hammer. The counter-attack plate is broken again, so that the coarse and medium-breaking pieces are in one step, and finally the materials that meet the requirements are discharged through the integration of the raft plates. When the jaw crusher enters the unbreakable material (such as iron balls, iron blocks, etc.) in the crushing chamber, the back thrust plate is used as the safety component of the crusher to protect the main components of the equipment from damage. As the tooth plate continues to wear, the discharge port becomes larger and the product becomes thicker. In order to obtain a qualified product grain size, the size of the discharge port needs to be adjusted regularly. Jaw crusher thrust plate (also known as the bracket), in addition to transmitting power to make the moving plate to swing back and forth, but also has a safety insurance function, changing its length can also play a role in regulating the discharge port. When the jaw crusher enters the unbreakable material (such as iron balls, iron blocks, etc.) in the crushing chamber, the back thrust plate is used as the safety component of the jaw crusher to protect the main components of the equipment from damage. The back thrust plate is generally cast into a whole with cast iron, and a groove or a plurality of small holes are opened in the middle portion to reduce the strength of the section; or two pieces can be cast, and then connected by screws (or rivets) to form a combined thrust plate. When the unbreakable material enters the crushing chamber, the equipment is overloaded, and the huge crushing force is transmitted to the thrust plate, causing the thrust plate to be broken or the screw of the combined thrust plate to be cut, and the machine stops working and plays an insurance role. As the tooth plate continues to wear, the discharge port becomes larger and the product becomes thicker. In order to obtain a qualified product size, it is necessary to periodically adjust the size of the discharge port. There are two main methods for adjusting the discharge port: (1) Gasket adjustment, that is, a set of gaskets is placed between the backrest of the backrest plate and the rear wall of the frame to increase or decrease the number of gaskets or change the thickness thereof, so as to adjust the discharge port. The method is compact in structure and reliable in regulation, and the large and medium-sized jaw crusher often uses this adjustment method. 2) Wedge adjustment is made by two wedges placed between the rear seat of the thrust plate and the frame, suitable for small crushers.