Wear-resistant sieve tray

Abstract

The invention belongs to the technical field of screening equipment, and relates to a wear-resistant screen tray which comprises a screen tray body, mounting holes are machined in the screen tray body, and a plurality of wear-resistant alloy blocks are evenly arranged along the outer circumference of the screen tray body at intervals. The axial width of the wear-resistant alloy block is consistent with the thickness of the sieve tray body; the radial height of the wear-resistant alloy block is consistent with the depth of the inlaying groove, and the radius of the outer circumference of the wear-resistant alloy block is consistent with the radius of the sieve tray. The two side faces and the outer circumferential face of the abrasion-resistant alloy block are exposed outside, in the working process of the sieve tray body, materials make contact with the exposed abrasion-resistant alloy block preferentially, the abrasion-resistant alloy block has high hardness and abrasion resistance, abrasion of the materials to the sieve tray body can be effectively resisted, and therefore the service life of the sieve tray body is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of screening equipment, and particularly relates to a wear-resistant sieve tray. Background Art

[0002] A roller screen mainly consists of a number of parallel axes arranged in parallel, with a number of sieve trays. The parallel axes rotate synchronously to push the material forward, and at the same time, the screening operation is gradually completed. It is applicable to the screening of original domestic waste, the screening and dehydration of incineration slag of hazardous waste, and industrial mineral raw and auxiliary materials, etc.

[0003] Application No. 202022843860.5 discloses a transmission device for a roller screen sieve tray, which includes a sieve shaft and a retaining sleeve and a sieve tray alternately sleeved on the sieve shaft in sequence. The screening area in the middle of the sieve shaft is a rectangular structure, the sieve shafts on both sides of the rectangular structure are circular structures, and the sieve shafts adjacent to the rectangular structure are processed into external thread structures. Rectangular holes matching the rectangular structure of the sieve shaft are provided in the middle of the sieve tray and the retaining sleeve. The retaining sleeve and the sieve tray are alternately sleeved on the rectangular structure of the sieve shaft through the rectangular holes in the middle thereof, and the retaining sleeves at both ends are respectively tightened by nuts screwed on the external thread structures of the sieve shaft to realize the fastening of the sieve tray and the retaining sleeve.

[0004] Application No. CN201620709187.7 discloses a sieve tray for a roller screen and a roller screen. The sieve tray includes a tray body (1), an axially installed through hole is formed in the middle of the tray body (1), and the outer peripheral surface of the tray body (1) is formed into a stepped circumferential surface, and the stepped circumferential surface includes a plurality of first surfaces and a plurality of second surfaces, and each of the first surfaces and each of the second surfaces are alternately connected to each other.

[0005] The sieve tray will gradually wear during the long-term collision and friction with the material, resulting in the thinning of the sieve tray and affecting the screening accuracy. The above sieve trays are all integral structures. After the sieve tray is worn, the entire sieve tray needs to be replaced, and the cost is relatively high. Therefore, the present invention proposes a wear-resistant sieve tray. Summary of the Invention

[0006] The main purpose of the present invention is to provide a wear-resistant sieve tray to solve the problem of high maintenance cost of the integrated sieve tray in the prior art.

[0007] The present invention proposes a wear-resistant sieve tray, which is composed of wear-resistant alloy blocks and a steel alloy sieve tray body.

[0008] Preferably, the wear-resistant alloy block is a cermet formed by hot isostatic pressing sintering or vacuum atmosphere sintering. The mass ratios of its main components are as follows: 15.0 - 75.0% WC or 12.0 - 78.0% TiC, 0.1 - 11.0% Cr2C3, ≤35.5% Co, ≤35.5% Ni, ≤15.0% Cr, ≤30.5% Fe, ≤9.0% Mo, ≤4.5% Si, ≤3.0% B.

[0009] Preferably, the sieve plate body is processed with mounting holes, and a plurality of wear-resistant alloy blocks as described in claim 1 are evenly spaced along the outer circumference of the sieve plate body; the axial width of the wear-resistant alloy block is the same as the thickness of the sieve plate body; the radial height of the wear-resistant alloy block is the same as the depth of the embedding groove, and the outer circumferential radius of the wear-resistant alloy block is the same as the radius of the sieve plate.

[0010] Preferably, the wear-resistant alloy block is set in a trapezoidal or hammer-shaped structure, and two side faces and the outer circumferential face of the wear-resistant alloy block are exposed.

[0011] Preferably, a plurality of embedding grooves are distributed along the outer circumference of the sieve plate body, and the wear-resistant alloy block is fixed by interference fit with the embedding groove and integrally welded by high-frequency induction heating or locally welded by spot welding.

[0012] Preferably, the chord length of the inner circle of the wear-resistant alloy block is greater than the arc length of the outer circle, forming a quasi-isosceles trapezoid, a right trapezoid or other hammer shapes.

[0013] Preferably, the included angle between the trapezoidal waist side of the wear-resistant alloy block and the radius direction of the sieve plate body is greater than 3 degrees.

[0014] Preferably, the sieve plate body is made of a low-carbon alloy steel plate. The mass ratios of its main components are as follows: 0.21 - 0.45% C, 0.35 - 1.15% Si, 0.32 - 1.73% Mn, 0.42 - 1.7% Cr, 0.35 - 1.7% Ni, 0.21 - 0.75% Mo, ≤0.005% B, ≤0.025% P, ≤0.01% S

[0015] Preferably, the sieve plate body is made of a high-carbon alloy steel plate. The mass ratios of its main components are as follows: 0.90 - 1.10% C, 1.30 - 1.60% Cr, 0.20 - 0.44% Mn, 0.15 - 0.45% Si, ≤0.035% Ni, ≤0.025% Mo, ≤0.005% B, ≤0.025% P, ≤0.025% S.

[0016] The beneficial effects of the technical solution of the present invention are as follows: Compared with the prior art, in the present application, a plurality of wear-resistant alloy blocks are evenly inlaid on the outer periphery of the sieve plate body. Three side surfaces of the wear-resistant alloy blocks that are connected in sequence are exposed. During the operation of the sieve plate body, the material first contacts the wear-resistant alloy blocks on the outer periphery. The wear-resistant alloy blocks have good hardness and wear resistance, and can effectively resist the wear of the material on the sieve plate body, thereby prolonging the service life of the sieve plate body;

[0017] The wear-resistant alloy blocks are welded in the inlay grooves by high-frequency induction heating. When the wear-resistant alloy blocks are worn, the sieve plate body is heated by a high-frequency induction heating device to loosen the wear-resistant alloy blocks and the inlay grooves, so that the worn wear-resistant alloy blocks can be removed and replaced, without replacing the entire sieve plate body, thereby saving maintenance costs and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an assembly drawing of a composite wear-resistant sieve plate for an embodiment.

[0019] Figure 2 It is a schematic structural diagram of the sieve plate body.

[0020] The numbers in the figure represent:

[0021] 1. Sieve plate body; 2. Wear-resistant alloy block; 3. Inlay groove; 4. Mounting hole; 5. Sieve shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] Embodiment:

[0024] As Figures 1 to 2 shown, a wear-resistant sieve plate of the present invention includes a sieve plate body, and the overall shape of the sieve plate body is circular and is installed on the sieve shaft through a mounting hole with a keyway provided at the center of the sieve plate body. In the use environment, a plurality of sieve plate bodies are sleeved on the sieve shaft 1 at intervals, and the screening and dehydration of the material are realized through the gaps between the sieve plate bodies.

[0025] The sieve plate body is made of high-carbon alloy steel plate or low-carbon alloy steel plate. The main components of the high-carbon alloy steel plate are 0.90 - 1.10% C, 1.30 - 1.60% Cr, 0.20 - 0.44% Mn, 0.15 - 0.45% Si, ≤0.035% Ni, ≤0.025% Mo, ≤0.005% B, ≤0.025% P, ≤0.025% S. The metallographic structure is composed of tempered martensite + carbide + retained austenite. The main mechanical properties are hardness HRC50 - 61, elongation ≥8%, and impact energy ≥18J. The main components of the low-carbon alloy steel plate are 0.21 - 0.45% C, 0.35 - 1.15% Si, 0.32 - 1.73% Mn, 0.42 - 1.7% Cr, 0.35 - 1.7% Ni, 0.21 - 0.75% Mo, ≤0.005% B, ≤0.025% P, ≤0.01% S. The metallographic structure is composed of tempered martensite + retained austenite. The main mechanical properties are hardness HRC45 - 61, elongation ≥8%, and impact energy ≥20J.

[0026] Mosaic grooves are evenly spaced on the outer circumferential surface of the sieve plate body. Wear-resistant alloy blocks are connected in the mosaic grooves by mechanical embedding and welding methods. The wear-resistant alloy blocks are metal ceramics formed by hot isostatic pressing sintering or vacuum atmosphere sintering. The main components are 15.0 - 75.0% WC or 12.0 - 78.0% TiC, 0.1 - 11.0% Cr2C3, ≤35.5% Co, ≤35.5% Ni, ≤15.0% Cr, ≤30.5% Fe, ≤9.0% Mo, ≤4.5% Si, ≤3.0% B, etc. The metallographic structure is solid solution + carbide (WC or TiC, Cr2C3), and fine borides and silicides are distributed in the solid solution. The main mechanical properties are hardness Hv700 - 1200, bending strength TRS850 - 1500Mpa, with high hardness and strength.

[0027] The axial width of the wear-resistant alloy block is the same as the thickness of the sieve plate body; the radial height of the wear-resistant alloy block is not less than the depth of the mosaic groove. During the screening process, the material first contacts the outer side and the left and right sides of the wear-resistant alloy block, which can effectively resist the wear of the material on the sieve plate body, thereby extending the service life of the sieve plate body.

[0028] The wear-resistant alloy block is set in a trapezoidal or hammer-shaped structure. The chord length of the inner circle of the wear-resistant alloy block is greater than the arc length of the outer circle, forming a quasi-isosceles trapezoid or right trapezoid or other hammer shape. The included angle between the trapezoidal waist side of the wear-resistant alloy block and the radius direction of the sieve plate body is greater than 3 degrees to prevent the wear-resistant alloy block from being thrown out when the sieve plate body rotates at high speed.

[0029] The wear-resistant alloy block is welded in the inlay groove by high-frequency induction heating. When the wear-resistant alloy block is worn, the sieve plate body is heated by a high-frequency induction heating device to loosen the wear-resistant alloy block from the inlay groove, so that the worn wear-resistant alloy block can be removed and replaced, without replacing the entire sieve plate body, thus saving maintenance costs and improving efficiency.

[0030] The density of the wear-resistant alloy block is greater than that of the sieve plate body, which can increase the edge mass of the sieve plate body, thereby increasing the moment of inertia of the turntable body and making the operation of the sieve plate body more stable. The wear-resistant alloy block can also play a role in dispersing stress and reduce the possibility of fatigue crack initiation caused by stress concentration.

[0031] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A wear-resistant sieve plate, characterized in that: The wear-resistant sieve plate is composed of a wear-resistant alloy block and an alloy steel sieve plate body.

2. A wear-resistant sieve plate according to claim 1, characterized in that: The wear-resistant alloy block is a metal ceramic formed by hot isostatic pressing or vacuum atmosphere sintering, and the mass ratio of its main components is as follows: 15.0-75.0% WC or 12.0-78.0% TiC, 0.1-11.0% Cr2C3, ≤35.5% Co, ≤35.5% Ni, ≤15.0% Cr, ≤30.5% Fe, ≤9.0% Mo, ≤4.5% Si, ≤3.0% B.

3. A wear-resistant sieve plate according to claim 1, characterized in that: The sieve plate body is processed with a mounting hole, and a plurality of wear-resistant alloy blocks as described in claim 1 are evenly spaced along the outer circumference of the sieve plate body; the axial width of the wear-resistant alloy block is consistent with the thickness of the sieve plate body; the radial height of the wear-resistant alloy block is consistent with the depth of the inlay groove, and the outer circumferential radius of the wear-resistant alloy block is consistent with the radius of the sieve plate.

4. A wear-resistant sieve plate according to claim 2, characterized in that: The wear-resistant alloy block is arranged in a trapezoidal or hammer-shaped structure, and two side surfaces and an outer circumferential surface of the wear-resistant alloy block are exposed.

5. A wear-resistant sieve plate according to claim 3, characterized in that: A plurality of inlay grooves are distributed along the outer circumference of the sieve plate body. The wear-resistant alloy block and the inlay grooves are interference-fitted and integrally welded by high-frequency induction heating or locally fixed by spot welding.

6. A wear-resistant sieve plate according to claim 2, characterized in that: The inner arc length of the wear-resistant alloy block is greater than the outer arc length, forming a quasi-isosceles trapezoid or a right-angle trapezoid or other hammer shape.

7. A wear-resistant sieve plate according to claim 3, characterized in that: The angle between the trapezoidal waist edge of the wear-resistant alloy block and the radius direction of the sieve plate body is greater than 3 degrees.

8. The wear-resistant sieve plate according to claim 3, characterized in that: The sieve plate body is made of low-carbon alloy steel plate, and the mass ratio of its main components is as follows: 0.21-0.45% C, 0.35-1.15% Si, 0.32-1.73% Mn, 0.42-1.7% Cr, 0.35-1.7% Ni, 0.21-0.75% Mo, ≤0.005% B, ≤0.025% P, ≤0.01% S.

9. A wear-resistant sieve plate according to claim 3, characterized in that: The sieve plate body is made of high carbon alloy steel plate, and the mass ratio of its main components is as follows: 0.90-1.10% C, 1.30-1.60% Cr, 0.20-0.44% Mn, 0.15-0.45% Si, ≤0.035% Ni, ≤0.025% Mo, ≤0.005% B, ≤0.025% P, ≤0.025% S.

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