RU2166382C1 - Sifter sieve - Google Patents

Abstract

FIELD: sifting equipment . SUBSTANCE: sieve has frame with sifting surface defined by strings provided with extension springs which are attached on frame by end members. Sieve is further provided with stretching device and string fastening device. Extension springs are covered with flexible material and provided with alternating projections on coils, so that bulk material sifting cells are defined between adjacent string and two projections. Sieve of such construction is adapted for sorting out solid materials and may be used in different branches of industry. EFFECT: simplified construction and increased efficiency. 3 dwg

Description

 The invention relates to the sorting of solid materials, in particular to sieves for cleaning and sorting bulk materials.

 A sieve is known in a screening device, including inclined sieves made in the form of sieve fixed on the longitudinal axis of the supports in the duct supports of elastic grates and grates of more rigid material, placed alternately across the width of the sieve, the working surface of grates of a more rigid material is placed below the working surface of the elastic grates less than the height of the elastic grates, while the grates of a more rigid material are made with stops on the working surface / SU, copyright certificate N 1411060, class . 07 V 1/46, publ. 1988 y.

 A disadvantage of the known sieve is the design complexity due to the presence of various types of grates. A tape-string sieve is known, which is equipped with an additional support and a device for regulating the rigidity of the additional support, the latter being placed parallel to the longitudinal supports and installed with a gap relative to the inoperative surface / SU, copyright certificate N 1003933, cl. 07 V 1/46, publ. 1983 /.

 A disadvantage of the known ribbon-string sieve is the design complexity due to the presence of additional support.

 Known string sieve, adopted as a prototype, containing a frame with a screening surface in the form of strings, a tension device, a device for attaching strings, the strings are equipped with loads made in the form of split cylinders with bevels at the ends, the loads are installed across the width of the sieve through one string / SU, copyright certificate N 1371718, cl. 07 V 1/04, publ. 1988 y.

 A disadvantage of the known sieve is the design complexity due to the presence of split cylinders that are mounted on strings.

 The technical result of the invention is to simplify the design.

 The specified technical result is achieved in that the screen sieve containing a frame with a screening surface in the form of strings, a tensioner and a device for attaching strings, the strings are equipped with tension springs located in the center of their cross section, which are fixed to the frame using the end elements of the tension springs, tensioning devices and devices for fastening strings, and tension springs are covered with elastic material and are made with alternating protrusions of turns, as a result of which between the adjacent string cells for sifting granular material are formed with one and two protrusions. Figure 1 shows a top view of a screen sieve. Figure 2 is a cross section of strings AA of FIG. 1 (conventionally shown for one string) and in FIG. 3 is a section BB of FIG. 1 (string fastening on one side of the frame is conventionally shown).

 The sieve of the screen consists of a frame 1 / Fig. 1/ with a screening surface in the form of strings 2, which are equipped with tension springs 3 located in the center of the cross section of the strings 2 and covered with elastic material 4, which increases the rigidity of the strings and simplifies the design, as it is not required additional items in the form of, for example, cargo. The strings 2 are fixed on the frame 1 using the end elements 5 / Fig. 1 and 3 / tension springs 3, the tensioner 6 and the device 7 for attaching the strings 2. The tension springs 3 are made with alternating protrusions 8 turns 9 / Fig. 1 and 2 /, as a result of which, between the adjacent string 2 and two protrusions 8 of the strings 2, cells 10 are formed for screening the bulk material.

 Screen sieve works as follows.

 With vibration exposure to the screen sieve frame 1 / Fig. 1,2 and 3 / receives vibrational movements that are transmitted through the end elements 5, the tensioner 6 and the fixture 7 to the strings 2. The parameters of the vibrational movement of the strings 2 depend on the stiffness of the tension springs 3, their tension using the tensioner 6 and the properties of the elastic material 4, with which the tensile springs 3 are coated, and the parameters of the screened material are determined by the sizes of the cells 10, which can be changed by the sizes of the protrusions 8 and the distances between the coils 9 of the tensile springs 2.

Claims (1)

 Screen sieve containing a frame with a screening surface in the form of strings, a tension device and a device for attaching strings, characterized in that the strings are equipped with tension springs located in the center of their cross section, which are fixed to the frame using the end elements of the tension springs, the tension device and devices for attaching strings and tension springs are covered with elastic material and are made with alternating protrusions of coils, as a result of which between the adjacent string and two protrusions is formed cells for screening bulk material.

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