Composite flip-flow screen based on casting molding

Abstract

The invention relates to the technical field of flip-flow screens, in particular to a composite flip-flow screen mesh based on casting molding, which comprises a screen surface and edge rubber strips arranged on the front side and the rear side of the screen surface, the screen surface comprises a plurality of warps and wefts which are respectively arranged at equal intervals, and clamping grooves matched with transverse supporting strips in a flip-flow screen box in a clamping manner are formed in the bottom surfaces of the edge rubber strips; the warp yarn comprises a flexible steel wire rope framework and a TPU layer wrapping the flexible steel wire rope framework, the weft yarn is a silk yarn made of a TPU material, and the edge rubber strips are made of an elastic polyurethane material; the warps and the wefts are processed into a screen surface by adopting a node sweat soldering process; the edge rubber strips are formed by casting MDI system raw materials, and the ends of the warps extend into the casting body. Therefore, the tensile strength, the aperture ratio and the screening efficiency of the flip-flow screen are improved, and the service life of the flip-flow screen is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of loose-fitting screens, in particular to a composite loose-fitting screen based on casting. Background Art

[0002] The relaxation screen is a new type of screening machine developed from the traditional circular vibrating screen. It is suitable for screening hard-to-screen materials with high viscosity and a water content of 7% to 14% with a particle size of 1 to 13 mm. It has a significant effect on screening fine-grained raw coal. At present, the relaxation screen is gradually being widely used in industrial fields such as mineral processing.

[0003] At present, the relaxation screen used is made of retractable polyurethane material and is a thin mesh. The front and rear sides are fixed to the horizontal support plate in the relaxation screen box with mounting strips. During operation, the material is ejected, shaken, separated, chromatographed and screened on the screen by alternating tension and relaxation of the relaxation screen. At the same time, the material can move forward to achieve efficient screening of the material.

[0004] However, this polyurethane relaxation screen has the problems of weak tensile strength, low opening rate, low screening efficiency and short service life. Summary of the invention

[0005] The object of the present invention is to provide a composite loose screen based on casting, which is used to solve the problems of weak tensile strength, low opening rate, low screening efficiency and short service life of the loose screen in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a composite relaxation screen based on casting, comprising a screen surface and edge rubber strips arranged on the front and rear sides of the screen surface, the screen surface comprising a plurality of warp wires and weft wires arranged at equal distances, the bottom surface of the edge rubber strip is provided with a card slot that is matched with the transverse support strip in the relaxation screen box; the warp wire comprises a flexible steel wire rope skeleton and a TPU layer coated on the outside of the flexible steel wire rope skeleton, the weft wire is a wire made of TPU material, and the edge rubber strip is an elastic polyurethane material; the composite processing technology of the screen surface and the edge rubber strip comprises the following steps:

[0007] S1, using a flexible steel wire rope as a skeleton and TPU as a coating material to prepare the warp yarn through an extruder;

[0008] S2, using TPU as raw material to prepare the weft yarn through an extruder;

[0009] S3, processing the warp and weft into the screen surface by node hot-melt welding process;

[0010] S4, cutting the screen surface according to the width of the inner cavity of the relaxation screen box and the spacing between the transverse support bars;

[0011] S5, respectively buckle the ends of the warp threads on the front and rear sides of the cut screen surface with steel buckles, and place the ends of the warp threads close to the steel buckles into a mold;

[0012] S6, casting and molding the edge rubber strip;

[0013] Use MDI system raw materials to fill the mold cavity, demould after curing, and trim the demoulded product to obtain the semi-finished product of the relaxed screen;

[0014] S7. Place the semi-finished product of the relaxation screen in a drying room for secondary curing to produce a finished relaxation screen.

[0015] Preferably, in step S6, the temperature of the MDI system raw materials during pouring is 95-105° C., and the pouring is performed under normal pressure.

[0016] Preferably, in step S6, the MDI system raw materials are defoamed by flame defoaming method before pouring.

[0017] Preferably, in step S6, the MDI system raw material is poured into the mold cavity, solidified for 20 minutes, and then demoulded.

[0018] Preferably, in step S7, the temperature in the drying room is set to 75-85° C., and the secondary curing time is 20-25 hours.

[0019] Preferably, the warp threads are arranged on the upper side of the weft threads.

[0020] Preferably, the edge rubber strip is provided with embedded steel bars, which are arranged in pairs and the pairs of embedded steel bars are clamped on the upper and lower sides of the warp wires; wherein the embedded steel bars are located on the inner side of the steel buckle.

[0021] Preferably, when the warp and weft threads are hot-melt welded in step S3, the warp and weft threads are straightened using a tensioning mechanism respectively.

[0022] Preferably, in the step S6, after the edge rubber strip is cast, the corners of the top surface of the edge rubber strip close to the screen surface are chamfered.

[0023] Preferably, in the step S6, while the edge rubber strips are being cast and formed, a plurality of reinforcing rib casting belts extending in the longitudinal direction are provided in the transverse direction between the edge rubber strips.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention relates to a composite relaxation screen based on casting molding. In addition to the warp wires along the relaxation direction being coated with TPU thermoplastic polyurethane material by a flexible steel wire rope skeleton, the entire screen surface is divided into several partitions, and polyurethane is cast between the partitions to form screen surface reinforcement ribs, thereby greatly improving the tear resistance and flexural resistance of the screen surface along the relaxation direction.

[0026] 2. The present invention relates to a composite relaxation screen based on casting, in which the weft wire adopts skeleton-free TPU polyurethane wire, which not only greatly improves the opening rate of the relaxation screen (the opening rate of the general fine particle material screen can only reach 35-40%, and the relaxation screen can reach 40%-60%); it also improves the precision of the hole type. At the same time, due to the relaxation elasticity of the skeleton-free TPU polyurethane wire, the screening efficiency can be improved, and the material can be prevented from blocking and blocking the hole, thereby improving the screening efficiency.

[0027] 3. The present invention relates to a composite loose-tension screen based on casting, in which the screen surface is in the form of a rod screen composed of warp and weft wires, which reduces the contact area between the material and the screen surface, increases the wear resistance of the screen, and thus greatly prolongs the service life of the loose-tension screen.

[0028] 4. The present invention relates to a composite relaxation screen based on casting, in which the warp wires of the screen surface are arranged above the weft wires, which can effectively guide the material and reduce the impact of large particle materials on the skeleton-free weft wires. The warp wires with a flexible steel wire rope skeleton support large particle materials, and small particle materials fall into the material holding trough composed of adjacent warp wires, which is convenient for screening. The large material particles move along the vertical ribs composed of the adjacent warp wires of the screen along the direction of material movement to form screen material, which not only reduces the damage to the weft wires of the screen and increases the life of the screen, but also plays an important role in improving the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the composite relaxation screen of the present invention;

[0030] Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the composite relaxation screen (including the reinforcing rib casting belt) of the present invention.

[0032] In the figure: 1-screen surface; 1.1-warp; 1.2-weft;

[0033] 2-Edge rubber strip; 2.1-Card slot. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-3 The present invention provides a technical solution, a composite relaxation screen based on casting, comprising a screen surface 1 and edge rubber strips 2 arranged on the front and rear sides of the screen surface 1, the screen surface 1 comprising a plurality of warp wires 1.1 and weft wires 1.2 arranged at equal intervals, the bottom surface of the edge rubber strips 2 is provided with a card slot 2.1 which is matched with the transverse support strip in the relaxation screen box; the warp wires 1.1 comprise a flexible steel wire rope skeleton and a TPU layer coated on the outside of the flexible steel wire rope skeleton, the weft wires 1.2 are wires made of TPU material, and the edge rubber strips 2 are made of elastic polyurethane material; wherein the warp wires 1.1 are arranged on the upper side of the weft wires 1.2, that is, when screening the material, the vertical rib strip-shaped holes on the screen surface 1 can be effectively formed, the large particle material slides toward the discharge end along the vertical rib direction, and the small particle material required for the composite screening falls into the screen holes between the screen wires and is screened, which greatly reduces the impact and wear of the large particle material on the weft wire, thereby improving the life of the screen and the efficiency of small particle screening.

[0036] The composite processing technology of the screen surface 1 and the edge rubber strip 2 includes the following steps:

[0037] S1. Using a flexible steel wire rope as a skeleton and TPU as a coating material, a warp yarn 1.1 is prepared by an extruder;

[0038] S2, using TPU as raw material to prepare weft yarn 1.2 through an extruder;

[0039] S3. The warp wires 1.1 and the weft wires 1.2 are processed into the screen surface 1 by using a node hot-melt welding process; wherein, when the warp wires 1.1 and the weft wires 1.2 are hot-melt welded, the warp wires 1.1 and the weft wires 1.2 are straightened by using a tensioning mechanism respectively to ensure the flatness of the screen surface 1.

[0040] S4, cutting the screen surface 1 according to the width of the inner cavity of the relaxation screen box and the spacing between the transverse support bars;

[0041] S5, respectively buckle the ends of the warp threads 1.1 on the front and rear sides of the cut screen surface 1 with steel buckles, and place the ends of the warp threads 1.1 close to the steel buckles into a mold;

[0042] S6, casting the edge rubber strip 2;

[0043] Use MDI system raw materials to fill the mold cavity, demould after curing, and trim the demoulded product to obtain the semi-finished product of the relaxed screen;

[0044] Among them, the MDI system raw materials are defoamed by flame defoaming method before pouring; the temperature of the MDI system raw materials during pouring is 95-105°C, the optimal temperature is 100°C, and the pouring is carried out under normal pressure; after the MDI system raw materials are poured into the mold cavity, they are solidified for 20 minutes and then demolded.

[0045] In addition, after the edge rubber strips 2 are cast and formed, the corners of the top surface of the edge rubber strips 2 close to the screen surface 1 are chamfered, that is, the chamfered portion forms a transition surface between the edge rubber strips 2 and the screen surface 1 to ensure that when the material is screened, the material can smoothly move downward along the inclined direction of the relaxation screen box. While the edge rubber strips 2 are cast and formed, a plurality of reinforcing rib casting belts extending longitudinally are arranged in the transverse direction between the edge rubber strips 2. The reinforcing rib casting belts form a plurality of partitions on the screen surface 1 to improve the tear resistance and flexural resistance of the screen surface 1 along the relaxation direction.

[0046] Since a slot 2.1 is provided at the bottom of the edge rubber strip 2, in order to further improve the overall mechanical properties of the edge rubber strip 2, embedded steel bars are provided inside the edge rubber strip 2. The embedded steel bars are arranged in pairs and the pairs of embedded steel bars are clamped at the upper and lower sides of the warp wire 1.1; wherein the embedded steel bars are located on the inner side of the steel buckle.

[0047] S7. Place the semi-finished product of the relaxation screen in a drying room for secondary curing to produce a finished relaxation screen.

[0048] The temperature in the drying room is set at 75-85°C, with 80°C being optimal, and the secondary curing time is 20-25 hours, with 24 hours being optimal.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite loose screen based on casting, characterized in that: The invention comprises a screen surface (1) and edge rubber strips (2) arranged at the front and rear sides of the screen surface (1), wherein the screen surface (1) comprises a plurality of warp wires (1.1) and weft wires (1.2) arranged at equal distances from each other, and a bottom surface of the edge rubber strip (2) is provided with a card slot (2.1) that is card-connected and matched with a transverse support strip in a tension screen box; The warp wire (1.1) comprises a flexible steel wire rope skeleton and a TPU layer coated on the outside of the flexible steel wire rope skeleton, the weft wire (1.2) is a wire made of TPU material, and the edge rubber strip (2) is made of elastic polyurethane material; The composite processing technology of the screen surface (1) and the edge rubber strip (2) comprises the following steps: S1, using a flexible steel wire rope as a skeleton and TPU as a coating material to prepare the warp yarn (1.1) through an extruder; S2, using TPU as raw material to prepare the weft yarn (1.2) through an extruder; S3, using a node hot-melt welding process to process the warp threads (1.1) and the weft threads (1.2) into the screen surface (1); S4, cutting the screen surface (1) according to the width of the inner cavity of the relaxation screen box and the spacing between the transverse support bars; S5, respectively fastening the ends of the warp threads (1.1) on the front and rear sides of the cut screen surface (1) with steel buckles, and placing the ends of the warp threads (1.1) close to the steel buckles into a mold; S6, casting the edge rubber strip (2); Use MDI system raw materials to fill the mold cavity, demould after curing, and trim the demoulded product to obtain the semi-finished product of the relaxed screen; S7. Place the semi-finished product of the relaxation screen in a drying room for secondary curing to produce a finished relaxation screen.

2. A composite loose screen based on casting molding according to claim 1, characterized in that: In step S6, the temperature of the MDI system raw materials during pouring is 95-105° C., and the pouring is performed under normal pressure.

3. A composite loose screen based on casting molding according to claim 1, characterized in that: In step S6, the MDI system raw materials are defoamed by flame defoaming method before pouring.

4. The composite loose screen based on casting molding according to claim 1, characterized in that: In the step S6, the MDI system raw material is poured into the mold cavity, solidified for 20 minutes, and then demoulded.

5. The composite loose screen based on casting molding according to claim 1, characterized in that: In step S7, the temperature in the drying room is set to 75-85° C., and the secondary curing time is 20-25 hours.

6. A composite loose screen based on casting molding according to claim 1, characterized in that: The warp threads (1.1) are arranged on the upper side of the weft threads (1.2).

7. The composite loose screen based on casting molding according to claim 1, characterized in that: The edge rubber strip (2) is provided with embedded steel bars, which are arranged in pairs and the pairs of embedded steel bars are clamped on the upper and lower sides of the warp wire (1.1); wherein the embedded steel bars are located on the inner side of the steel buckle.

8. The composite loose screen based on casting molding according to claim 1, characterized in that: When the warp threads (1.1) and the weft threads (1.2) are heat-melted and welded in step S3, the warp threads (1.1) and the weft threads (1.2) are respectively straightened using a tensioning mechanism.

9. The composite loose screen based on casting molding according to claim 1, characterized in that: In the step S6, after the edge rubber strip (2) is cast and formed, the corners of the top surface of the edge rubber strip (2) close to the screen surface (1) are chamfered.

10. The composite loose screen based on casting molding according to claim 1, characterized in that: In the step S6, while the edge rubber strips (2) are being cast and formed, a plurality of reinforcing rib casting strips extending in the longitudinal direction are arranged in the transverse direction between the edge rubber strips (2).

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