A composite flip-flop screen based on casting

Abstract

The present application relates to the technical field of flip-flop screen, in particular to a composite flip-flop screen based on casting forming, which comprises a screen surface and a side rubber strip arranged on the front and back sides of the screen surface, the screen surface comprises a plurality of warp yarns and weft yarns arranged at equal intervals respectively, and the bottom surface of the side rubber strip is provided with a clamping groove matched with the clamping of the transverse supporting strip in the flip-flop screen box body; the warp yarns comprise a flexible steel wire rope framework and a TPU layer covered outside the flexible steel wire rope framework, the weft yarns are TPU material threads, and the side rubber strip is an elastic polyurethane material; the warp yarns and the weft yarns are processed into the screen surface by using a node hot melting welding process; the side rubber strip is formed by pouring MDI system raw materials, and the end of the warp yarns extends into the pouring body. The flip-flop screen improves the tensile strength, the opening rate and the screening efficiency, and prolongs the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flip-flop screen, in particular to a composite flip-flop screen based on casting forming. BACKGROUND

[0002] The flip-flop screen is a new type of screening machine developed from the traditional circular vibrating screen, which is suitable for screening 1-13mm particle size of difficult material with large viscosity and 7%-14% water content, and has remarkable screening effect on fine particle size raw coal. At present, the flip-flop screen is gradually widely used in the industrial field of ore dressing.

[0003] At present, the flip-flop screen used is integrally injection molded by a stretchable polyurethane material, and the whole is a thin mesh, and the front and rear sides are respectively fixed on the horizontal support plates in the flip-flop screen box body by using installation strips. During work, the flip-flop screen is alternately tensioned and relaxed, so that the material is projected, scattered, separated, layered and screened on the screen, and at the same time, the material can move forward to realize high-efficiency screening of the material.

[0004] However, the polyurethane flip-flop screen has the problems of weak tensile strength, low opening rate, low screening efficiency and short service life. SUMMARY

[0005] The purpose of the present application is to provide a composite flip-flop screen based on casting forming, which solves the problems of weak tensile strength, low opening rate, low screening efficiency and short service life of the flip-flop screen in the prior art.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a composite flip-flop screen based on casting forming, comprising a screen surface and a side rubber strip arranged on the front and rear sides of the screen surface, the screen surface comprising a plurality of warp yarns and weft yarns arranged at equal intervals, respectively, and the bottom surface of the side rubber strip is provided with a clamping groove matched with the clamping of the horizontal support strip in the flip-flop screen box body; the warp yarn comprises a flexible steel wire rope skeleton and a TPU layer wrapped outside the flexible steel wire rope skeleton, the weft yarn is a silk thread made of TPU material, and the side rubber strip is made of elastic polyurethane material; the composite processing technology of the screen surface and the side rubber strip comprises the following steps:

[0007] S1, preparing the warp yarn by using flexible steel wire rope as the skeleton and TPU as the wrapping material through an extruder;

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

[0009] S3, processing the warp yarn and weft yarn into the screen surface by using a node hot melting welding process;

[0010] S4, cutting the screen surface according to the width of the inner cavity of the flip-flop screen box body and the spacing of the horizontal support strips;

[0011] S5, respectively buckle the steel buckle of the silk end of the screen surface front and back side after cutting, and put the end of the silk close to the steel buckle into the mold;

[0012] S6, the edge rubber strip is injection molded;

[0013] The MDI system raw material is selected to fill the mold cavity, and after curing, demolding is carried out, and after trimming the product after demolding, a relaxation screen half-finished product is obtained;

[0014] S7, the relaxation screen half-finished product is placed in the oven for secondary curing to make the tension screen finished product.

[0015] Preferably, the temperature of the MDI system raw material in step S6 is 95-105℃ when pouring, and the pouring is carried out under normal pressure.

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

[0017] Preferably, the MDI system raw material is poured into the mold cavity and cured for 20 minutes before demolding in step S6.

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

[0019] Preferably, the warp yarn is arranged on the upper side of the weft yarn.

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

[0021] Preferably, the warp yarn and weft yarn are straightened by using a tensioning mechanism respectively during the hot melt welding of the warp yarn and weft yarn in step S3.

[0022] Preferably, the edge rubber strip is chamfered at the edge of the top surface of the edge rubber strip close to the screen surface after injection molding in step S6.

[0023] Preferably, a plurality of reinforcing rib injection bands extending along the longitudinal direction are arranged between the edge rubber strips in step S6.

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] 1. The present invention relates to a composite relaxation screen based on casting molding. In addition, the warp wires along the relaxation direction are covered with TPU thermoplastic polyurethane material using 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 yarn adopts skeleton-free TPU polyurethane yarn, 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%, while 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 yarn, the screening efficiency can be improved, and the material can be prevented from blocking or blocking the hole, thereby improving the screening efficiency.

[0027] 3. The present invention relates to a composite relaxation screen based on casting molding, in which the screen surface is composed of warp and weft wires in the form of a rod screen, which reduces the contact area between the material and the screen surface, increases the wear resistance of the screen, and thus greatly extends the service life of the relaxation 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 trough composed of adjacent warp wires, which is convenient for screening. The large material particles move along the vertical ribs composed of adjacent warp wires of the screen along the direction of material movement to form the 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 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 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 technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] Please refer to Figures 1-3 The present application provides a technical solution, a composite flip-flow screen based on casting forming, comprising a screen surface 1 and an edge rubber strip 2 arranged on the front and back sides of the screen surface 1, the screen surface 1 comprising a plurality of warp yarns 1.1 and weft yarns 1.2 arranged at equal intervals respectively, and the bottom surface of the edge rubber strip 2 is provided with a clamping groove 2.1 matched with the clamping of the transverse support strip in the flip-flow screen box body; the warp yarn 1.1 comprises a flexible steel wire rope framework and a TPU layer covered outside the flexible steel wire rope framework, the weft yarn 1.2 is a silk thread of TPU material, and the edge rubber strip 2 is an elastic polyurethane material; wherein the warp yarn 1.1 is arranged on the upper side of the weft yarn 1.2, that is, a vertical rib type hole on the screen surface 1 can be effectively formed when the material is screened, the large particle material slides along the vertical rib direction to the discharge end, the small particle material required for composite screening falls into the screen hole between the screen wires, the impact and wear of the weft yarn by the large particle material are greatly reduced, and the service life of the screen and the efficiency of the small particle screening are improved.

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

[0037] S1, preparing the warp yarn 1.1 by using a flexible steel wire rope as a framework and TPU as a coating material through an extruder;

[0038] S2, preparing the weft yarn 1.2 by using TPU as a raw material through an extruder;

[0039] S3, processing the warp yarn 1.1 and the weft yarn 1.2 into the screen surface 1 by using a node hot melting welding process; wherein when the warp yarn 1.1 and the weft yarn 1.2 are hot melting welded, the warp yarn 1.1 and the weft yarn 1.2 are respectively subjected to straightening treatment by using a tensioning mechanism 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 flip-flow screen box body and the spacing between the transverse support strips;

[0041] S5, buckling a steel buckle to the end of the warp yarn 1.1 on the front and back sides of the cut screen surface 1 respectively, and putting the end of the warp yarn 1.1 close to the steel buckle into a mold;

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

[0043] filling the mold cavity with MDI system raw materials, demolding after curing, and obtaining the flip-flow screen semi-finished product by trimming the product after demolding.

[0044] The MDI system raw material is defoamed by flame defoaming method before pouring; the temperature of the MDI system raw material during pouring is 95-105°C, and the optimal temperature is 100°C, and the pouring is performed under normal pressure; and the MDI system raw material is poured into the mold cavity and cured for 20 minutes before demolding.

[0045] In addition, after the pouring and forming of the edge rubber strip 2, the edge of the top surface of the edge rubber strip 2 close to the screen surface 1 is chamfered, i.e. the chamfered part forms a transition surface between the edge rubber strip 2 and the screen surface 1, so as to ensure that the material can smoothly move downward along the inclined direction of the flip screen box during screening. At the same time of pouring and forming the edge rubber strip 2, a plurality of reinforcing rib pouring strips extending in the longitudinal direction are arranged transversely between the edge rubber strips 2, so as to form a plurality of sub-zones of the screen surface 1, thereby improving the tear resistance and flex resistance of the screen surface 1 in the flip direction.

[0046] Due to the setting of the clamping groove 2.1 at the bottom of the edge rubber strip 2, in order to further improve the overall mechanical properties of the edge rubber strip 2, a reinforcing rib is arranged in the edge rubber strip 2, and the reinforcing ribs are arranged in pairs and clamped on the upper and lower sides of the warp yarn 1.1; wherein the reinforcing rib is located at the inner side of the steel buckle.

[0047] S7, placing the flip screen semi-finished product in the drying room for secondary curing to make the flip screen finished product.

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

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

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

Claims

1. A composite loose-fitting screen based on casting, characterized by: The invention comprises a screen surface (1) and edge rubber strips (2) provided on 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 intervals, and the bottom surface of the edge rubber strips (2) is provided with a card slot (2.1) for card-engaging with a transverse support strip in a tension screen box; The warp (1.1) comprises a flexible steel wire skeleton and a TPU layer coated on the outside of the flexible steel wire skeleton, the weft (1.2) is a thread 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, the warp yarn (1.1) is prepared by 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 yarn (1.1) and the weft yarn (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, fastening the ends of the warp threads (1.1) on the front and rear sides of the cut screen surface (1) with steel buckles respectively, 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); The mold cavity is filled with MDI system raw materials, and demoulding is performed after solidification. The demoulded product is trimmed to obtain the semi-finished product of the relaxation screen; S7. Place the semi-finished product of the relaxation screen in a drying room for secondary curing to produce a relaxation screen finished product.

2. The composite loose-fitting 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. The composite loose-fitting 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-fitting screen based on casting molding according to claim 1, characterized in that: In step S6, the MDI system raw materials are poured into the mold cavity and cured for 20 minutes before demoulding.

5. The composite loose-fitting 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. The composite loose-fitting 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-fitting 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 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-fitting 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 straightened using a tensioning mechanism.

9. The composite loose-fitting 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-fitting 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 provided between the edge rubber strips (2) in the transverse direction.

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