The frame of the metal briquette machine is the basic component to withstand the briquette force. Classification of frame structure of existing metal briquette machine
(A) combined structure frame
1. Beam-column structure
The beam-column structure refers to the structure in which the front and rear beams are connected by tension columns. In the existing metal briquette machines, the cylindrical tension column structure accounts for the vast majority, and the prestressed tension column structure has only a history of about two decades. The pressure-bearing component-box-shaped pressure column replaces the traditional cylindrical tension column fastened with a nut, and the front and rear beams are prestressed to form a rigid frame. Generally, the tie rod is composed of four thick steel plates with stoppers at both ends, and a box-shaped pressure column is sleeved on the outside of the tie rods inside the front and rear beams. Under the action of a certain pre-load, the extension rod is deformed and a pad is added to one end of the pressure column, so that the entire frame is in a pre-stressed state.
This structure is a prestressed frame. The difference is that the method of applying prestress is different. It depends on the overpressure of the main cylinder (sometimes the side cylinder force is added) to reach between 1.2 and 1.3 times the rated briquetting force ( According to the specific conditions of the design), the method of adding shims on the inside of the front beam (its thickness can be determined through calculation in advance), so that the tension column is under tension; the tension column is somewhat special in structure, that is, in front of the tension column A large "T" hook was added to the outer end of the beam side. A special hydraulic cylinder is used to forcefully lengthen the tension column through a large "T" hook, and a gasket is added to the outside of the front beam to establish the prestress of the tension column. In the former, the method of using the master cylinder overload is sometimes limited. For example, the working pressure of the originally designed high-pressure oil is too high (31.5 MPa), and it is more difficult to overpressure. Moreover, the overload of the master cylinder must be determined based on calculated data. , Can not be arbitrarily overpressure; the latter is not restricted, generally higher prestress values can be used, such as 1.2 to 1.6 times the normal value. In both cases, compressive and bending stresses are applied to the pressure columns necessary between the front and rear beams.
In addition, under the inspiration of this kind of prestressed tension column, the prestress method is also adopted for the traditional tension column. That is, a pressure column is placed on the tension column of the front and rear beams (which can also serve as a guide rail for the moving beam and briquetting cylinder seat), and the tension column is forcibly extended by a special hydraulic cylinder on the outside of the front beam, and then the tension column is back The prestress of the nut to establish the tension column.
During the pre-stressed tension column, the amplitude of the periodic stress is only about 50% of the amplitude of the non-prestressed tension column (determined by design). Therefore, the rigidity of the frame is improved, which is beneficial to guarantee the quality of the briquette products.https://www.aupubaler.com/