Self-cleaning arc-shaped screen plate and screening machine thereof

Abstract

The invention relates to the technical field of screening machines, and particularly discloses a self-cleaning arc-shaped screen plate and a screening machine thereof.The screen plate comprises a polyurethane wire mesh screen surface and an arc-shaped screen plate frame, and the arc-shaped section polyurethane wire mesh screen surface is composed of a left arc-shaped side plate, a right arc-shaped side plate, a plurality of polyurethane transverse wires connected between the two arc-shaped side plates and a plurality of arc-shaped screen plates; the polyurethane sandwich longitudinal wires are fixed at the bottoms of the polyurethane transverse wires; the arc section arc-shaped sieve plate frame comprises a left arc-shaped end strip and a right arc-shaped end strip, arc-shaped grooves used for containing the arc-shaped side plates are formed in the opposite side faces of the two arc-shaped end strips, and a transverse strip is fixedly connected between the front end and the rear end of each arc-shaped end strip; through the low adhesion characteristic of a polyurethane material, elastic micro-deformation of the screen surface, flow guide of an arc-shaped structure and the synergistic effect of quadruple mechanisms of the active screen surface state regulation and control mechanism, self-cleaning of the whole process from adhesion prevention to active blockage removal is achieved, and the self-cleaning type self-cleaning screen is particularly suitable for screening wet, viscous and easily-blocked materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of screening machines, and discloses a self-cleaning arc-shaped screen plate and a screening machine. BACKGROUND

[0002] As the core equipment in material grading and dewatering processes, the screening efficiency and continuous operation capacity of the screening machine are crucial. However, the screen plate generally faces problems such as screen hole blockage and material adhesion on the screen surface during use, especially when dealing with wet, sticky and fine-grained materials, the blockage phenomenon is more serious, which leads to a sharp decline in screening efficiency.

[0003] To address the above problems, the prior art has developed a variety of self-cleaning screen plate technical solutions, mainly including the following categories: 1. Using auxiliary mechanical devices such as bouncing balls and brush rollers to impact or sweep the back of the screen plate, this type of method has a relatively simple structure, but the cleaning effect is limited for materials with high viscosity; 2. Using the high-frequency vibration of ultrasonic waves to cause micro deformation of the screen surface to eliminate blockage, this technology is effective for ultra-fine powders, but the system cost is high and the energy consumption is large, which is not suitable for large-scale or coarse-grained material screening; 3. Selecting polyurethane or other elastic materials to make the screen plate, relying on the elastic deformation of the material itself to prevent particle jamming to some extent, but for severely blocked or special structure screen plates, the passive elastic recovery self-cleaning ability is still insufficient; 4. Using arc-shaped screen surface design, relying on the gravity of the material to slide down the arc surface to produce a certain self-cleaning effect, but for materials with strong adhesion, the dynamic anti-adhesion and active unblocking ability is still limited.

[0004] For example, the utility model patent with application number 202420519177.1 discloses a self-cleaning polyurethane screen plate, which includes a screening surface and a screen plate framework, a plurality of screening areas are arranged on the screening surface, and adjacent two screening areas are arranged at intervals, a plurality of wave-shaped screen holes are arranged in each screening area, and the screening surface is made of polyurethane material with a Shore hardness of 83-87. This patent increases the screening area by arranging wave-shaped screen holes on the screening surface to prevent screen hole blockage, and uses the properties of polyurethane material to reduce the risk of screen hole blockage and achieve self-cleaning of the screen plate. However, this type of polyurethane screen plate still has insufficient passive elastic recovery self-cleaning ability when used for screening wet and highly viscous materials, and cannot guarantee long-term and efficient screening of wet and highly viscous materials. Based on this, the present application proposes a self-cleaning arc-shaped screen plate and a screening machine that deeply synergizes and integrates the excellent properties of the material, the dynamic structure design of the screen surface, and the active and controllable cleaning mechanism to solve the above technical problems and deficiencies of the existing self-cleaning screen plates. SUMMARY

[0005] The self-cleaning arc-shaped screen plate and the screen machine thereof can realize deep cooperation and fusion of excellent material properties, dynamic structure design of the screen surface and active and controllable cleaning mechanism, and solve the technical problems and defects of poor self-cleaning ability and serious blocking phenomenon of the existing self-cleaning screen plate when screening and processing materials with high humidity and high viscosity.

[0006] The self-cleaning arc-shaped screen plate and the screen machine thereof can realize deep cooperation and fusion of excellent material properties, dynamic structure design of the screen surface and active and controllable cleaning mechanism, and solve the technical problems and defects of poor self-cleaning ability and serious blocking phenomenon of the existing self-cleaning screen plate when screening and processing materials with high humidity and high viscosity. The self-cleaning arc-shaped screen plate comprises a polyurethane wire screen surface and an arc-shaped screen plate frame, the polyurethane wire screen surface is composed of left and right two arc-shaped side plates, a plurality of polyurethane horizontal wires connected between the two arc-shaped side plates, and a plurality of polyurethane sandwiched vertical wires fixed at the bottom of the polyurethane horizontal wires, and the polyurethane horizontal wires and the polyurethane sandwiched vertical wires are connected with each other in a staggered manner to form a grid-shaped screen hole. The arc-shaped screen plate frame comprises two arc-shaped end strips, arc-shaped grooves for accommodating the arc-shaped side plates are formed on the opposite sides of the two arc-shaped end strips, and a horizontal strip is fixedly connected between the front end and the rear end of the two arc-shaped end strips, so that the two arc-shaped end strips and the two horizontal strips form a frame space for mounting the polyurethane wire screen surface. The arc-shaped side plate is connected with the arc-shaped groove through a first spring, the front end and the rear end of the polyurethane sandwiched vertical wire are fixedly connected with the corresponding horizontal strip, a pulling rod horizontally extending out of the arc-shaped end strip is arranged on each arc-shaped side plate, and a guide wheel is mounted at the outer end of the pulling rod.

[0007] As a further arrangement of the above-mentioned scheme, the polyurethane sandwiched vertical wire comprises a flexible metal wire inner core and a polyurethane skin layer covering the outside of the flexible metal wire inner core.

[0008] As a further arrangement of the above-mentioned scheme, the connection points between the polyurethane horizontal wire and the polyurethane sandwiched vertical wire are integrally cast or secondarily cast and fixed.

[0009] As a further arrangement of the above-mentioned scheme, a plurality of polyurethane horizontal wires are arranged in parallel and at equal intervals along the arc-shaped extension direction of the arc-shaped side plate.

[0010] As a further arrangement of the above-mentioned scheme, the front end and the rear end of the arc-shaped side plate are provided with sliding holes for acting with the horizontal strip.

[0011] The self-cleaning arc-shaped screen plate and the screen machine thereof can realize deep cooperation and fusion of excellent material properties, dynamic structure design of the screen surface and active and controllable cleaning mechanism, and solve the technical problems and defects of poor self-cleaning ability and serious blocking phenomenon of the existing self-cleaning screen plate when screening and processing materials with high humidity and high viscosity. The rotating shaft is provided with a rotating driver through a transmission member, two guide groove rotors are symmetrically provided at the two ends of the rotating shaft extending out of the screen base, and the guide groove rotors act on the guide wheels on the side corresponding to the self-cleaning arc-shaped screen plate, so as to realize the periodic stretching movement of the polyurethane wire mesh screen surface in the transverse direction.

[0012] As a further arrangement of the above scheme, the guide groove rotor comprises a cylindrical body fixedly connected with the rotating shaft in a concentric manner, and a closed-loop guide groove is formed on the outer cylindrical surface of the cylindrical body and acts on the guide wheel.

[0013] As a further arrangement of the above scheme, the closed-loop guide groove comprises a plurality of arc segments arranged in an annular array, one end of the arc segment is arranged close to the screen base, and the other end is arranged away from the screen base, and the adjacent two arc segments are connected through an axial segment.

[0014] As a further arrangement of the above scheme, the lower end of the feeding hopper is connected with a downwardly inclined material guiding plate for guiding the material onto the self-cleaning arc-shaped screen plate, and a coarse material guiding plate is arranged in the screen base below the self-cleaning arc-shaped screen plate.

[0015] Compared with the prior art, the present application has the following advantages: The present application realizes the whole process of self-cleaning from preventing adhesion to actively unblocking through the synergistic effect of the four mechanisms of the low adhesion characteristics of the polyurethane material, the elastic micro-deformation of the screen surface, the arc structure flow guide, and the active screen surface state regulating mechanism, and is especially suitable for screening of wet, sticky and easily blocked materials.

[0016] The polyurethane wire mesh screen surface in the self-cleaning arc-shaped screen plate of the present application is connected by polyurethane horizontal wires and polyurethane sandwich longitudinal wires. The polyurethane horizontal wires have good stretching characteristics based on their material properties, which can continuously produce micro-deformation of the screen surface during operation. The polyurethane sandwich longitudinal wires have a composite structure of "metal wire core + polyurethane coating", which not only retains the elasticity and wear resistance of polyurethane, but also enhances the overall tensile strength and impact resistance through the metal wire, so that the prepared self-cleaning arc-shaped screen plate has good self-cleaning effect while retaining its impact resistance.

[0017] The active screen surface state regulating mechanism in the present application drives the screen surface to periodically switch between "stretching-relaxation" states through the cooperation of the guide groove rotor and the pulling rod + guide wheel, changes the screen hole size regularly, and strongly breaks the particle bridging and wedging effect, significantly improving the unblocking efficiency and overcoming the shortcomings of traditional polyurethane screen plates relying on passive elastic recovery.

[0018] The screen machine in the application adopts elastic support and multi-dimensional vibration design, promotes material throwing, layering and screen penetration; meanwhile, vibration and active screen surface control cooperate with each other in time sequence and amplitude, forming a collaborative screening mode of "vibration dispersion + active hole cleaning", which maintains high-efficiency screening without stopping. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 It is a three-dimensional assembly diagram of the self-cleaning arc-shaped screen plate in the present application. Figure 2 It is a three-dimensional structure diagram of the polyurethane wire mesh screen surface in the present application. Figure 3 It is a local structure diagram of the polyurethane wire mesh in the present application. Figure 4 It is a first angle three-dimensional structure diagram of the screen machine in the present application. Figure 5 It is a second angle three-dimensional structure diagram of the screen machine in the present application. Figure 6 It is a three-dimensional assembly diagram of the screen plate seat and the self-cleaning arc-shaped screen plate in the present application. Figure 7 It is a three-dimensional assembly diagram of the screen plate seat and the self-cleaning arc-shaped screen plate in the present application. Figure 5 It is an enlarged structure diagram of A in the present application. DETAILED DESCRIPTION

[0021] In order to make the personnel in the technical field better understand the present application scheme, the technical solutions in the present application embodiments will be clearly and completely described below in combination with the drawings in the present application embodiments. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Figures 1-7 DETAILED DESCRIPTION Embodiment 1

[0023] Embodiment 1 discloses a self-cleaning arc-shaped screen plate, referring to the accompanying drawings. Figures 1-3The self-cleaning curved screen plate 1 mainly comprises a polyurethane wire screen surface 10 and a curved screen plate frame 20 for supporting the screen surface.

[0024] The polyurethane wire screen surface 10 is supported by two parallel arc-shaped side plates 101 as the main body, and a plurality of polyurethane horizontal wires 102 are arranged in parallel and at equal intervals between the two arc-shaped side plates 101 along the arc-shaped extension direction, and the two ends of the polyurethane horizontal wires 102 are fixedly connected with the two arc-shaped side plates 101 respectively.

[0025] In order to enhance the screen surface structure and form screen holes, a plurality of polyurethane sandwich vertical wires 103 are also uniformly arranged at the bottom of the polyurethane horizontal wires 102 (i.e. the side away from the feeding direction), which are perpendicularly crossed and connected with the polyurethane horizontal wires 102, and together form a stable grid structure, and the rectangular or square gaps formed by the crossing are the screen holes.

[0026] Specifically, the polyurethane sandwich vertical wire 103 adopts a composite structure design, the core of which is a flexible metal wire inner core 1031, and the outside is completely wrapped with a polyurethane skin layer 1032 by a coating process. The polyurethane horizontal wire 102 is of solid polyurethane material, and the connecting joints between the two can be solidified by one-piece casting or subsequent secondary casting to ensure the connection strength.

[0027] The curved screen plate frame 20 comprises two arc-shaped end strips 201 as the main support, and the inner side of each arc-shaped end strip 201 is processed with an arc-shaped groove 202 matching the outer shape of the arc-shaped side plate 101 for accommodating and positioning the polyurethane wire screen surface 10. Between the front end and the rear end of the two arc-shaped end strips 201, a horizontal strip 203 is fixedly connected respectively, and the two horizontal strips 203 and the two arc-shaped end strips 201 together enclose a rectangular mounting frame, and the polyurethane wire screen surface 10 is mounted in the frame. During installation, the arc-shaped side plate 101 of the polyurethane wire screen surface 10 is aligned with the arc-shaped groove 202, and is slid into the groove, and a first spring 204 is connected between the arc-shaped side plate 101 and the bottom of the arc-shaped groove 202, which provides continuous elastic pre-tightening force, so that the screen surface is always in a tensioned state, and at the same time allows the screen surface to produce elastic vibration within a certain range. In addition, a sliding hole is provided at the front and rear ends of the arc-shaped side plate 101, which acts with the horizontal strip 203, so that the arc-shaped side plate 101 can only run in the horizontal direction through the guiding action between the horizontal strip 203 and the sliding hole.

[0028] The two ends of the polyurethane sandwich longitudinal wire 103 are fixedly connected with the front and rear two transverse strips 203 respectively, thereby providing key longitudinal support and force transmission path for the entire screen surface. This fixing mode enables the screen surface to have overall flexibility while maintaining necessary structural rigidity. In addition, a pulling rod 205 is fixedly connected to the outer side of each arc-shaped side plate 101. The pulling rod 205 extends outwardly and horizontally and passes through the corresponding hole in the arc-shaped end strip 201, and then a freely rotatable guide wheel 206 is installed at the extending end of each pulling rod 205.

[0029] The screen plate disclosed in the embodiment 1 realizes self-cleaning through the synergistic effect of material and structure. First, the low surface energy property of the polyurethane material itself makes it hydrophobic and oleophobic, which can effectively reduce the adhesion of wet sticky materials. Second, the key lies in its dynamic working mechanism: when the material impacts the screen surface, the polyurethane transverse wire 102 will produce transverse expansion, and at the same time, the entire screen surface connected by the first spring 204 can perform micro elastic vibration. The superposition of the two movements makes the size and shape of the screen hole continuously change in a micro way, thereby constantly destroying the "bridging" or "wedge" effect of the material particles at the hole, forcing the jammed particles to fall off, and achieving the purpose of anti-blocking and self-cleaning. In addition, the polyurethane sandwich longitudinal wire 103 embedded with flexible metal wires plays the role of "elastic bones" in it, which not only enhances the impact resistance of the screen surface, but also participates in the entire elastic deformation process. Embodiment 2

[0030] Embodiment 2 discloses a screening machine which is designed based on the self-cleaning arc-shaped screen plate in embodiment 1. The related content of the self-cleaning arc-shaped screen plate 1 is not repeated here.

[0031] Referring to the drawings Figures 4-7 The screening machine includes a machine frame body (mainly composed of a conveying seat 2 and a stand 4), a feeding unit, a screening unit, a driving and cleaning mechanism, and a discharge system. In terms of the machine frame body, the conveying seat 2 is internally provided with a conveying belt 3 for conveying undersize materials, and a stand 4 is arranged at one end of the conveying seat 2. The top of the stand 4 is fixedly provided with a feeding hopper 5, and the feeding hopper 5 is connected with an inclined downward material guide plate 6. The feeding hopper 5 and the material guide plate 6 constitute the feeding unit.

[0032] The screening unit is a core component, mainly including a screen plate seat 7 and a self-cleaning arc-shaped screen plate 1 installed thereon. The screen plate seat 7 is arranged directly above the other end of the conveying seat 2, and the bottom thereof is designed to be hollow so that the undersize materials can directly fall onto the conveying belt 3 below. The self-cleaning arc-shaped screen plate 1 is fixedly installed inside the screen plate seat 7 at the upper end thereof, and the upper end thereof is connected with the outlet of the material guide plate 6 to receive the materials. The lower end of the self-cleaning arc-shaped screen plate 1 is provided with a coarse material guide plate 8 below, which is used to collect and discharge the coarse particles that have not passed through the screen.

[0033] In order to improve the screening efficiency, the screen deck 7 is elastically supported on the conveying seat 2 by a plurality of second springs 9, forming a vibratable screening mechanism. A vibration source 10 (such as a vibration motor or a vibration exciter) is installed on the screen deck 7. When the vibration source 10 is working, it can drive the entire screen deck 7 and the self-cleaning arc-shaped screen deck 1 to produce multi-dimensional vibration (at least including vertical and horizontal components) under the constraint of the second springs 9, thereby strengthening the throwing, layering and screening process of the material.

[0034] In order to further enhance the self-cleaning ability of the screen surface, the screen machine is also designed with a set of active screen surface state regulation mechanism. The mechanism includes a rotating shaft 11 rotatably installed in the screen deck 7 and located below the self-cleaning arc-shaped screen deck 1. The outer end of the rotating shaft 11 extending out of the screen deck 7 is connected with a rotary driver 13 through a synchronous belt 12 or a transmission chain. Then, a pair of mirror-symmetrical guide groove rotors 14 are fixedly arranged at both ends of the rotating shaft 11 extending out of the screen deck 7. The pulling rods 205 on both sides of the self-cleaning arc-shaped screen deck 1 pass through the through holes on the screen deck 7, and the guide wheels 206 at the ends of the pulling rods 205 are embedded in the closed-loop guide grooves 140 of the corresponding guide groove rotors 14 and cooperate with them.

[0035] Specifically, the guide groove rotor 14 includes a cylindrical body 141 fixedly connected with the rotating shaft 11 concentrically, and a closed-loop guide groove 140 is formed on the outer circular surface of the cylindrical body 141. The closed-loop guide groove 140 is composed of a plurality of arc segments 143 arranged in an annular array. One end of the arc segment 143 is close to the screen deck 7 (the proximal point), and the other end is away from the screen deck 7 (the distal point). Then, a straight line segment (i.e. the axial segment 142) extending along the axis of the cylindrical body is smoothly connected between adjacent two arc segments 143, thereby forming a closed-loop action guide groove.

[0036] When the rotating shaft 11 is uniformly rotated by the rotary driver 13 through the synchronous belt 12, the two guide groove rotors 14 are synchronously rotated. The guide wheels 206 embedded in the guide grooves 140 are forced to follow the track of the grooves, thereby driving the pulling rods 205 and the arc-shaped side plates 101 connected therewith to produce regular reciprocating motion.

[0037] During the reciprocating motion, the following process occurs: when the guide wheel 206 moves from the proximal point to the distal point along the arc segment 143, the pulling rod 205 is pulled outward, which compresses the first spring 204 and simultaneously stretches the polyurethane core longitudinal wire 103 and the entire polyurethane wire mesh screen surface 10, so that it enters a tight state, and the screen hole is slightly enlarged. When the guide wheel 206 runs to the axial segment 142 and quickly slides to the proximal point of the next arc segment, the radial constraint on the pulling rod 205 is suddenly released, and then the pulling rod 205 is quickly reset inward under the combined action of the restoring force of the first spring 204 and the elasticity of the polyurethane material itself. The screen surface instantaneously recovers from the tight state to the relaxed or natural state, and the screen hole size shrinks accordingly.

[0038] The direct effect of the above-mentioned "stretch-reset" process, which is carried out periodically and at high frequency with the rotation of the guide channel rotor 14, is to actively, substantially and periodically change the screen hole size, producing a "breathing" effect. This effect, combined with the multi-dimensional vibration of the screen machine itself and the elastic deformation of the polyurethane material, produces a synergistic self-cleaning effect. On the one hand, the periodic and violent deformation of the screen holes effectively mechanically extrudes or shakes off the particles that have been jammed. On the other hand, due to the continuous dynamic changes in the screen surface state and screen hole size, it is difficult for fine particles to stably adhere to the surface of the screen wire, thus maintaining the persistent cleanliness of the screen surface, thereby effectively ensuring the screening effect of the self-cleaning curved screen plate 1 during long-term operation.

[0039] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A self-cleaning curved screen deck characterized by, The polyurethane wire mesh screen surface is composed of left and right arc-shaped side plates, a plurality of polyurethane horizontal wires connected between the two arc-shaped side plates, and a plurality of polyurethane sandwiched vertical wires fixed at the bottom of the polyurethane horizontal wires, and the polyurethane horizontal wires and the polyurethane sandwiched vertical wires are interlaced and connected to form a grid-shaped screen hole. The arc-shaped screen plate frame comprises two arc-shaped end strips, arc-shaped grooves for accommodating the arc-shaped side plates are formed on the opposite sides of the two arc-shaped end strips, and a horizontal strip is fixedly connected between the front end and the rear end of the two arc-shaped end strips, so that the two arc-shaped end strips and the two horizontal strips form a frame space for mounting the polyurethane wire mesh screen surface. The arc-shaped side plate is connected with the arc-shaped groove through a first spring, the front end and the rear end of the polyurethane sandwiched vertical wire are fixedly connected with the corresponding horizontal strip, a pulling rod extending transversely out of the arc-shaped end strip is arranged on each arc-shaped side plate, and a guide wheel is mounted at the outer end of the pulling rod.

2. The self-cleaning curved screen deck of claim 1, wherein, The polyurethane sandwiched vertical wire comprises a flexible metal wire inner core and a polyurethane skin layer covering the outer part of the flexible metal wire inner core.

3. The self-cleaning curved screen deck of claim 1, wherein, The connection points between the polyurethane horizontal wire and the polyurethane sandwiched vertical wire are integrally cast or secondary cast and fixed.

4. The self-cleaning curved screen deck of claim 1, wherein, A plurality of polyurethane horizontal wires are arranged in parallel and at equal intervals along the arc-shaped extension direction of the arc-shaped side plate.

5. The self-cleaning curved screen deck of claim 1, wherein, Sliding holes for acting with the horizontal strip are formed at the front end and the rear end of the arc-shaped side plate.

6. A screening machine based on the self-cleaning curved screen deck according to any one of claims 1 to 5, characterized in that, The self-cleaning arc-shaped screen plate is arranged in the inside of the screen plate seat, and the vibration source is installed on the screen plate seat. A rotating shaft is arranged in the screen plate seat below the self-cleaning arc-shaped screen plate, the rotating shaft is connected with a rotary driver through a transmission member, two guide groove rotors are symmetrically arranged at the two ends of the rotating shaft extending out of the screen plate seat, and the guide groove rotors act with the guide wheels on the corresponding side of the self-cleaning arc-shaped screen plate to realize the periodic stretching movement of the polyurethane wire mesh screen surface in the transverse direction.

7. The screening machine of claim 6, wherein, The guide groove rotor comprises a cylindrical body fixedly connected with the rotating shaft, and a closed-loop guide groove for acting with the guide wheel is formed on the outer circular surface of the cylindrical body.

8. The screening machine of claim 7, wherein, The closed-loop guide groove comprises a plurality of arcuate segment groups arranged in a ring array, one end of the arcuate segment is arranged close to the screen plate seat, and the other end is arranged away from the screen plate seat, and the head end and the tail end between the adjacent two arcuate segments are connected through an axial segment.

9. The screening machine of claim 6, wherein, A material guide plate is arranged at the lower end of the feeding hopper, and a coarse material guide plate is arranged in the screen plate seat below the self-cleaning arc-shaped screen plate.

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