Wear-resistant ceramic-and-rubber composite metal slurry pump for mineral processing, and forming process

Abstract

Disclosed in the present invention is a wear-resistant ceramic-and-rubber composite metal slurry pump for mineral processing. The slurry pump comprises a supporting frame, a bearing assembly, a packing box, a pump casing, a front liner plate, a rear liner plate, a front protective sleeve, a rear protective sleeve and an impeller, wherein flow-passing members including the front liner plate, the rear liner plate, the front protective sleeve, the rear protective sleeve and the impeller are all made by using a wear-resistant ceramic-and-rubber composite metal forming process. Further provided in the present invention is a preparation method for a composite material of a wear-resistant ceramic-and-rubber composite metal. The wear-resistant ceramic-and-rubber composite metal slurry pump provided in the present invention gives full play to the wear resistance and corrosion resistance of ceramics; a segmented design solves the problems of it being difficult to upsize silicon carbide ceramics and same having a high brittleness; and the elasticity of rubber can buffer the impact of large particles on the silicon carbide ceramics, thereby improving the wear resistance of the slurry pump and prolonging the service life thereof.

Description

A wear-resistant ceramic and rubber composite metal slurry pump for mineral processing and its molding process Technical Field

[0001] The invention belongs to the technical field of centrifugal slurry pumps and wear-resistant ceramics for mineral processing, and relates to a wear-resistant ceramic and rubber composite metal slurry pump for mineral processing and a molding process. Background Art

[0002] Slurry pumps are widely used in industries such as mining, power plants, metallurgy, and chemical engineering to transport fluids containing solid particles. Lining materials for slurry pump flow passages primarily include wear-resistant materials such as rubber, carbide, or ceramics. However, carbide and rubber materials have poor corrosion resistance and are not ideal for use in certain operating conditions, leading to problems such as rapid failure and short service life.

[0003] With the rapid development of inorganic non-metallic materials, silicon carbide ceramics are becoming increasingly widely used in slurry pump lining materials due to their excellent properties such as high temperature resistance, high strength, corrosion resistance, and wear resistance. However, when silicon carbide ceramics are used in the flow passages of large slurry pumps, the sintering difficulty and cost increase exponentially, dimensional accuracy control is difficult, large-scale processes are difficult, and the assembly and sealing of guard plates and sleeves are difficult to ensure. In particular, when conveying slurry with particle diameters exceeding 2mm, ceramic impellers are prone to shattering under high speed and the impact of large solid particles, resulting in an unstable service life. Silicon nitride combined with silicon carbide ceramic materials has high impact resistance but poor wear resistance, especially in the application of lining materials for slurry pumps feeding primary grinding cyclones, which has certain limitations.

[0004] At present, the diameter of ceramic slurry pumps at home and abroad has only developed to 350mm. Breakthroughs in the large diameter of ceramic slurry pumps require the emergence of new technologies or processes.

[0005] Summary of the Invention

[0006] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a wear-resistant ceramic and rubber composite metal slurry pump and molding process for mineral processing. By dividing the ceramic material into blocks and bonding them to a metal skeleton, the problem that the silicon carbide material of the slurry pump flow parts is difficult to produce on a large scale and is easily broken under high-speed conditions is solved, thereby improving the service life of the slurry pump.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] The present invention provides a large-scale wear-resistant ceramic and rubber composite metal slurry pump for mineral processing, the slurry pump includes a bracket, a bearing assembly, a stuffing box, a pump casing, and a flow-through part; the flow-through part includes a front guard plate, a rear guard plate, a front sleeve, a rear sleeve and an impeller, and the flow-through parts such as the front guard plate, the rear guard plate, the front sleeve, the rear sleeve and the impeller all adopt a composite structure of wear-resistant ceramic and rubber composite metal, and rubber is filled between the wear-resistant ceramic block and the surface of the metal skeleton, and / or, between the wear-resistant ceramic block and the metal skeleton to form a rubber layer; the wear-resistant ceramic is bonded to the metal skeleton in the wear-prone area of ​​the flow-through part by rubber and / or adhesive; the wear-prone area refers to the area where the fluid linear velocity near the flow-through part is greater than 20m / s and / or backflow occurs.

[0009] Specifically, the wear-resistant ceramic can be directly bonded to the metal skeleton in the wear-prone area through an adhesive, and then the outside of the wear-resistant ceramic and the metal skeleton is wrapped with a vulcanized rubber process; it can also be directly molded using a vulcanization injection process on the surface of the wear-resistant ceramic and the metal skeleton and between the wear-resistant ceramic and the metal skeleton to play a bonding and buffering role.

[0010] The bracket is the basic supporting structure of the slurry pump, which is used to fix and carry the bearing assembly, pump shaft and other important components, and ensure the stability and balance of the slurry pump during operation;

[0011] The bearing assembly is mounted on the bracket and includes an axial bearing and a radial bearing, which are used to support and guide the rotation of the pump shaft and bear the axial force and radial force transmitted by the impeller;

[0012] The stuffing box is located at one end or both ends of the pump shaft and has a built-in stuffing seal and / or other forms of shaft sealing devices, which are used to prevent the slurry in the slurry pump from leaking outward along the axial direction, thereby maintaining the working efficiency of the slurry pump and preventing environmental pollution;

[0013] The pump casing is the main structure of the slurry pump, usually composed of upper and lower halves, or front and rear halves, connected by bolts. Components including flow-through parts and / or other wear-resistant bushings are installed inside the pump casing, which is connected to the bracket to form a complete slurry conveying channel.

[0014] In the overflow parts,

[0015] The front guard plate is installed in front of the impeller and cooperates with the inner wall of the pump casing and the sleeve to form a transition flow channel before the slurry enters the impeller, thereby reducing the direct impact and wear of the slurry on the impeller inlet;

[0016] The rear guard plate is installed behind the impeller and cooperates with the inner wall of the pump casing and the sleeve to form a transition channel for the slurry to flow from the impeller to the outlet section of the pump casing, so that the slurry flowing out of the impeller smoothly transitions to the outlet section of the pump casing, playing a role in anti-wear and shock absorption;

[0017] The front jacket and the rear jacket are combined to form a complete jacket of the slurry pump. The jacket is tightly attached to the inner wall of the pump casing, forming a spiral flow channel for the slurry to flow through, converting the energy generated by the impeller into static pressure energy of the slurry. The jacket itself has high wear resistance and protects the pump casing from wear.

[0018] The impeller is mounted on the pump shaft and is driven to rotate by the motor to pressurize and transport the slurry. The impeller, the front guard plate, the rear guard plate and the jacket form a continuous slurry flow channel.

[0019] The various components of the slurry pump are nested and interconnected, forming an efficient and wear-resistant slurry delivery system. The pump shaft runs through the entire pump body, transmitting the motor's power through the bearing assembly to the impeller. The impeller operates within the flow channel formed by the jacket, while the guard plate protects and guides the slurry flow, ensuring that the slurry pump maintains good performance and a long service life under long-term, high-intensity operating conditions.

[0020] The present invention utilizes computational fluid dynamics and discrete element software Rocky coupling calculation method to simulate and calculate the worn area of ​​the flow-through component, and determines the degree of wear by analyzing the wear amount of the flow-through component and the distribution area and size of the solid particle volume fraction.

[0021] In the present invention, the adhesive is selected from one or more of epoxy resin structural adhesive, AB adhesive, etc.; the bonding strength of the adhesive is not less than 10MPa;

[0022] The ceramic block is a wear-resistant ceramic material, including one or more of silicon carbide ceramics, silicon nitride ceramics or recrystallized ceramics, forming a wear-resistant ceramic layer; the density of the ceramic block is not less than 3.03g / cm 3 , hardness not less than 90HRA; flexural strength not less than 350MPa;

[0023] The radial dimension of a single ceramic block does not exceed 350 mm, the outer diameter width does not exceed 350 mm; the thickness ranges from 15 to 35 mm;

[0024] The gaps between the ceramic blocks and / or between the ceramic blocks and the metal frame are filled with vulcanized rubber;

[0025] The material of the metal skeleton includes high chromium alloy, Q235B carbon structural steel or QT500-7 ductile iron;

[0026] Specifically, the pump housing of the present invention can be made of QT500-7 ductile iron material, and the metal skeleton in the flow-through part can be made of Q235B carbon structural steel or QT500-7 ductile iron material.

[0027] The front guard plate and / or the rear guard plate both include a guard plate rubber layer, a guard plate ceramic layer and a guard plate metal frame; the guard plate ceramic layer and the guard plate rubber layer are composited on the surface of the guard plate metal frame; the guard plate metal frame includes an integrated hollow metal cylinder and a flat metal ring fixed to one end of the hollow metal cylinder, and the inner ring size of the flat metal ring matches the inner diameter of the hollow metal cylinder; the lower surface of the guard plate metal frame is provided with an annular groove, and the guard plate ceramic layer is arranged in the annular groove; the inner surface of the hollow metal cylinder and the lower surface of the guard plate metal frame are obtained by a vulcanization injection molding process to obtain the guard plate rubber layer, and / or, the guard plate rubber layer is obtained by a vulcanization injection molding process between the wear-resistant ceramic block and the guard plate metal frame; the thickness of the guard plate rubber layer is 0-20mm; when the thickness of the guard plate rubber layer is 0mm, the guard plate ceramic layer is exposed outside the guard plate rubber layer and is not covered by the guard plate rubber layer;

[0028] The guard plate ceramic layer is divided into M circles along the radial direction according to the diameter of the guard plate and the ceramic forming process, and each circle is divided into N guard plate ceramic blocks; wherein,

[0029] Wherein, D2 is outer diameter of guard plate; D1 is inner diameter of guard plate; i - the outer diameter circumference of the i-th circle; L1- the radial height of the ceramic block; L2- the outer diameter width of the ceramic block;

[0030] The radial dimension of the guard plate ceramic block does not exceed 350mm, and the outer diameter width does not exceed 350mm; the thickness range is 15-35mm; each guard plate ceramic block is fan-shaped, and each circle of the guard plate ceramic blocks is staggered; the bottom of the guard plate ceramic block is provided with a dovetail groove and / or a glue hole, and a plurality of grooves are provided around the four sides; the number of the dovetail grooves is 2-3, and the width range is 12-30mm; the diameter of the glue hole is 10-20mm, and the number is 9-16; the number of the grooves is 8-12, and the width range is 10-30mm; when vulcanizing rubber, the dovetail groove and / or the glue hole and the groove are filled with rubber material, which plays a bonding and buffering role between the ceramic blocks; the cross-section of the groove is rectangular, circular or other shapes;

[0031] The dovetail groove and the glue hole are selected from one of the two structures or a combination of the two.

[0032] The guard plate ceramic layer is divided into one or more circles. When the guard plate ceramic layer is one circle, first limit blocks are arranged at equal intervals on the periphery of the guard plate ceramic block to prevent the guard plate ceramic block from shifting in the outer diameter direction when the rubber is vulcanized; the first limit blocks are fixed to the guard plate metal frame by welding;

[0033] When the guard plate ceramic layer is larger than one circle, the guard plate ceramic blocks in two adjacent circles are staggered, the guard plate ceramic blocks in the outer circle are aligned with the outer edge of the guard plate, and the mold is used for limiting when vulcanizing the rubber, and no limiting blocks are set.

[0034] The front sheath and the rear sheath both include a sheath rubber layer, a sheath ceramic layer and a sheath metal frame;

[0035] The sheath ceramic layer is divided into N sheath ceramic blocks along the circumferential direction of the sheath; the sheath ceramic blocks are fixed to the sheath metal frame by the adhesive; the sheath ceramic layer is provided with second limit blocks along both sides of the sheath metal frame, and the second limit blocks are welded to the sheath metal frame, with a gap of 3-5 mm between the second limit blocks and the edge of the sheath ceramic blocks;

[0036] The main structures of the front sheath and the rear sheath are made of rubber;

[0037] Specifically, according to the wear condition of the slurry pump, a sheath ceramic block is selectively embedded in the wear position of the sheath, such as the tongue area and different cross-section positions, and the sheath ceramic block is fixed to the sheath metal frame by an adhesive. A second limit block is set on the edge of the sheath ceramic block to prevent circumferential displacement, and then embedded into the sheath rubber layer;

[0038] The curved surface of the sheath ceramic block is consistent with the flow surface of the sheath, and the circumferential and radial dimensions do not exceed 350 mm; the thickness does not exceed 35 mm;

[0039] The top contact edge and the bottom contact edge of the sheath ceramic block are set at an angle of 0-15 degrees, ensuring that the sheath ceramic block is in surface contact with the mold when subjected to vulcanization pressure, thereby preventing local force from crushing the ceramic.

[0040] The sheath ceramic block is about 0-15mm away from the rubber flow surface and about 20-30mm away from the front and rear sheath contact sealing surfaces to prevent the sheath ceramic layer from being crushed when the sheath rubber layer is installed;

[0041] The impeller includes an impeller ceramic block, an impeller metal frame and an impeller rubber layer; the impeller ceramic block is embedded in the area of ​​the impeller that is prone to wear; the area prone to wear has a high linear speed (for example, >20m / s) and a backflow area, where solid particles are easily accumulated and wear occurs, such as: the impeller inlet circumference, the inner circumference of the front cover plate, the inner circumference of the rear cover plate, the outer circumference of the rear cover plate, and the blade working surface; the impeller ceramic block includes an impeller inlet circumference ceramic block, a front cover plate inner circumference ceramic block, a rear cover plate inner circumference ceramic block, a rear cover plate outer circumference ceramic block, and a blade working surface ceramic block; the impeller ceramic block is pre-fixed on the impeller metal frame with an adhesive, placed together in a mold, and molded by injection rubber vulcanization;

[0042] The number of the impeller inlet circumferential ceramic blocks evenly divided along the inlet circumferential direction is consistent with the number of impeller blades; the front cover plate inner circumferential ceramic blocks, the rear cover plate inner circumferential ceramic blocks, and the blade working surface ceramic blocks can be divided into multiple small ceramic blocks or a whole ceramic block according to the impeller diameter and wear area; the rear cover plate outer circumferential ceramic blocks are fan-shaped distributed along the impeller outer diameter direction and are evenly divided into N pieces;

[0043] The thickness of the rubber covering the surface of the impeller ceramic block is 0-15 mm; when the thickness of the impeller rubber layer covering the surface of the impeller ceramic block is 0 mm, the impeller ceramic block is exposed outside the impeller rubber layer and is not covered by the impeller rubber layer.

[0044] In the present invention, different ceramic blocks may have different compositions according to actual needs, or may have the same composition.

[0045] In a specific embodiment, the impeller includes a front cover plate, a rear cover plate and a plurality of blades, the front cover plate and the rear cover plate are arranged opposite to each other, the plurality of blades are arranged between the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are connected through the plurality of blades; in the impeller, each blade is in the shape of a circular arc.

[0046] In the specific implementation process, the ceramic blocks that need to be bonded to the guard plate, the jacket, and the impeller can be fixed in the grooves with appropriate size and depth provided on the metal frame by bonding the ceramic blocks in the grooves.

[0047] In a specific implementation process, a plurality of the grooves are provided on the inner side surface of the front cover plate facing the rear cover plate, and are spaced apart along the circumferential direction of the inner side surface of the front cover plate; and / or,

[0048] The plurality of grooves are provided on the inner side surface of the rear cover plate facing the front cover plate, and are spaced apart along the circumferential direction of the inner side surface of the rear cover plate; and / or,

[0049] A plurality of grooves are provided on the inner surface of the impeller suction port; and / or,

[0050] A plurality of grooves are provided on the working surface of each blade.

[0051] Each of the wear-resistant ceramic blocks is fixedly connected to the impeller body through an adhesive.

[0052] In a specific embodiment, the rubber serving as a buffer and adhesive not only covers the surfaces of the metal skeleton and the ceramic block, but also can be filled between the metal skeleton and the ceramic block.

[0053] The present invention also provides a method for preparing a composite material of wear-resistant ceramic and rubber-composite metal, the method comprising: first cleaning the ceramic block with toluene, first brushing a curing agent on the surface, and then brushing a layer of rubber adhesive with a thickness of 0.5-2 mm; after standing for 2-3 hours, laminating it with a metal frame and placing it in a mold to improve the initial bonding strength and positioning, and then performing a rubber vulcanization process to form the composite material, with the vulcanization temperature being 120-150° C., the vulcanization pressure being 130-170 bar, and the vulcanization time being 3-4 hours;

[0054] The curing agent is a two-layered adhesive, which is divided into a primer and a top coat. The primer is made of CH205 and the diluents are butanone or acetone. The top coat is made of CH220 and the diluents are xylene or toluene. The rubber adhesive is a polymer of rubber particles and glue, which is used to enhance the adhesion between rubber and ceramics.

[0055] The beneficial effects of the present invention are as follows: the large-scale wear-resistant ceramic and rubber composite metal slurry pump for mineral processing provided by the present invention gives full play to the wear resistance and corrosion resistance of ceramics, and utilizes the solution of bonding ceramics in blocks according to the wear area to solve the problem that silicon carbide ceramics are difficult to scale up and are brittle. The rubber composite ceramic molding process solves the problem that the flow parts of the slurry pump are impacted by large particles under high-speed working conditions, causing the silicon carbide material to break. The elasticity of the rubber material can buffer and reduce the impact of large particles on the flow parts, thereby improving the wear resistance and service life of the slurry pump.

[0056] The ceramic and rubber composite metal slurry pump provided by the present invention has ceramic blocks that can be replaced individually and has low maintenance costs. It is particularly suitable for conveying media containing solid particles and corrosive media in mineral processing, metallurgy, chemical industry, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0058] FIG1 is a schematic structural diagram of a wear-resistant ceramic and rubber composite metal slurry pump for mineral processing according to the present invention.

[0059] FIG2 is a perspective view of the structure of a wear-resistant ceramic and rubber composite metal slurry pump for mineral processing according to the present invention.

[0060] FIG3 is a cross-sectional view of a front guard plate structure of a ceramic and rubber composite metal according to the present invention.

[0061] FIG4 is a schematic diagram of a front guard plate ceramic block bonded to a metal frame structure of the present invention.

[0062] FIG5 is a schematic diagram of the structure of a front guard plate ceramic block of the present invention.

[0063] FIG6 is a schematic diagram of another front guard plate ceramic block structure of the present invention.

[0064] FIG7 is a schematic diagram of the structure of a front sheath of a ceramic and rubber composite metal according to the present invention.

[0065] FIG8 is a cross-sectional view of a front sheath structure of a ceramic and rubber composite metal according to the present invention.

[0066] FIG9 is a schematic diagram of a sheath ceramic block bonded to a metal frame structure of the present invention.

[0067] FIG10 is a schematic structural diagram of a sheath ceramic block of the present invention.

[0068] FIG11 is a perspective view of a ceramic and rubber composite metal impeller of the present invention.

[0069] FIG12 is a schematic diagram of the structure of a ceramic and rubber composite metal impeller of the present invention.

[0070] FIG13 is a cross-sectional view of a ceramic and rubber composite metal impeller structure of the present invention.

[0071] FIG14 is a schematic diagram of a ceramic and rubber composite metal impeller ceramic block bonded to a metal skeleton according to the present invention.

[0072] FIG15 is a schematic diagram of a ceramic and rubber composite metal impeller ceramic block bonded to a metal skeleton according to the present invention.

[0073] In Figures 1 to 15, 1 is the bracket; 2 is the bearing assembly; 3 is the stuffing box; 4 is the pump casing; 5 is the front guard plate; 6 is the rear guard plate; 7 is the front jacket; 8 is the rear jacket; 9 is the impeller; 10 is the rubber layer of the guard plate; 10a is the ceramic block of the guard plate; 11 is the ceramic layer of the guard plate; 12 is the metal frame of the guard plate; 13 is the first stop block; 13a is the second stop block; 14 is the dovetail groove; 14a is the glue hole; 15 is the groove; 16. Sheath rubber layer; 17a. Sheath ceramic block; 17. Sheath ceramic layer; 18. Sheath metal skeleton; 19. Impeller ceramic block; 19a. Impeller inlet circumferential ceramic block; 19b. Front cover plate inner circumferential ceramic block; 19c. Rear cover plate inner circumferential ceramic block; 19d. Rear cover plate outer circumferential ceramic block; 19e. Blade working surface ceramic block; 20. Impeller metal skeleton; 21. Impeller rubber layer. DETAILED DESCRIPTION

[0074] The invention is further described in detail with reference to the following specific examples and accompanying drawings. The processes, conditions, experimental methods, etc. for implementing the present invention, except for those specifically mentioned below, are common knowledge and common common sense in the art and are not particularly limited by the present invention.

[0075] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0076] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0077] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0078] In this application, the term "comprising" is an open expression, that is, including the contents specified in the present invention, but not excluding other aspects.

[0079] In this application, the term "about" when applied to a value means allowing some slight imprecision in the value in the calculation or measurement (approximately or reasonably close to the value by some means).

[0080] In this application, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0081] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0082] The following further describes a large-scale wear-resistant ceramic and rubber composite metal slurry pump for mineral processing and its forming process in conjunction with the accompanying drawings:

[0083] The present invention provides a large-scale wear-resistant ceramic and rubber composite metal slurry pump for mineral processing, comprising a bracket 1, a bearing assembly 2, a stuffing box 3, a pump casing 4, a front guard plate 5, a rear guard plate 6, a front jacket 7, a rear jacket 8, and an impeller 9. The flow-through parts, such as the front guard plate 5, the rear guard plate 6, the front jacket 7, the rear jacket 8, and the impeller 9, are all made of a composite material of ceramic and rubber composite metal and are molded using a molding process.

[0084] Furthermore, the front guard plate 5 and / or the rear guard plate 6 each include a guard plate rubber layer 10, a guard plate ceramic layer 11 and a guard plate metal frame 12; the guard plate ceramic layer 11 and the guard plate rubber layer 10 are composited on the surface of the guard plate metal frame 12; the thickness of the guard plate rubber layer 10 covering the surface of the guard plate ceramic layer 11 is 0-20 mm;

[0085] The guard plate ceramic layer 11 is divided into 1-2 circles along the radial direction according to the diameter of the guard plate and the ceramic forming process, and each circle is divided into N fan-shaped guard plate ceramic blocks 10a, which are placed on the surface of the guard plate metal skeleton 12 along the circumferential direction;

[0086] When the guard plate ceramic layer 11 is one circle, first limit blocks 13 are evenly spaced around the outer periphery of the guard plate ceramic block 10a to prevent the guard plate ceramic block 10a from shifting in the outer diameter direction during rubber vulcanization; the first limit blocks 13 are fixed to the guard plate metal frame 12 by welding;

[0087] The guard plate ceramic blocks 10a are fan-shaped, and the guard plate ceramic blocks 10a in two adjacent circles are staggered. The bottom surface of the guard plate ceramic blocks 10a is provided with dovetail grooves 14 and / or glue holes 14a, and a plurality of grooves 15 are provided around the four sides. When the rubber is vulcanized, the dovetail grooves 14 and / or glue holes 14a and the grooves 15 are filled with rubber material, which plays a bonding and buffering role between the guard plate ceramic blocks 10a. The cross-section of the grooves 15 is rectangular, circular or other shapes.

[0088] The groove 15 is used to allow rubber to pass through the groove during the vulcanization process, and finally form a rubber layer outside the ceramic layer.

[0089] Furthermore, the front sheath 7 and the rear sheath 8 each include a sheath rubber layer 16, a sheath ceramic layer 17 and a sheath metal frame 18;

[0090] The sheath ceramic layer 17 is divided into N sheath ceramic blocks 17a along the circumferential direction of the sheath; according to the wear condition of the slurry pump, the sheath ceramic blocks 17a can be selectively embedded in the wear position of the sheath, such as the tongue area and different cross-section positions, and the sheath ceramic blocks 17a are fixed to the sheath metal skeleton 18 by adhesive. A second limit block 13a is provided on the edge of the sheath ceramic block 17a to prevent the sheath ceramic block 17a from circumferential displacement, and then embedded in the sheath rubber layer 16;

[0091] The top of the sheath ceramic block 17a is beveled to ensure that the sheath ceramic block 17a is in surface contact with the mold when subjected to vulcanization pressure, thereby preventing the ceramic from being crushed by local force.

[0092] The sheath ceramic block 17a is about 0-15mm away from the flow surface and about 20-30mm away from the front and rear sheath contact sealing surfaces to prevent the sheath ceramic layer 17 from being crushed when the sheath rubber layer 16 is installed;

[0093] Furthermore, the impeller 9 includes an impeller ceramic block 19, an impeller metal skeleton 20 and an impeller rubber layer 21;

[0094] The impeller ceramic block 19 is embedded in the wear-prone areas of the impeller 9, including: the impeller inlet circumference, the inner circumference of the front cover plate, the inner circumference of the rear cover plate, the outer circumference of the rear cover plate, and the blade working surface. The impeller ceramic block 19 is pre-fixed on the impeller metal frame 20 with an adhesive, and placed in a mold together, and molded by injection rubber vulcanization;

[0095] The impeller inlet circumferential ceramic block 19a is evenly divided into N pieces along the inlet circumferential direction, and the number is consistent with the number of impeller blades; the front cover plate inner circumferential ceramic block 19b, the rear cover plate inner circumferential ceramic block 19c, and the blade working surface ceramic block 19e can be divided into multiple pieces or a whole piece according to the impeller diameter and wear area; the rear cover plate outer circumferential ceramic block 19d is fan-shaped distributed along the impeller outer diameter direction and is evenly divided into N pieces;

[0096] The thickness of the rubber covering the surface of the impeller ceramic block 19 is 0-15mm;

[0097] Furthermore, the ceramic block is first cleaned with toluene, a curing agent is first applied to the surface, and then a layer of rubber adhesive is applied. After being left for 2-3 hours, the ceramic block is placed in a mold after being bonded to the metal frame to improve the initial bonding strength and positioning, and then a rubber vulcanization process is performed.

[0098] Furthermore, the present invention uses wear-resistant ceramic materials. The guard plate ceramic layer 11, the jacket ceramic layer 17 and the impeller ceramic block 19 of the present invention can be made of silicon carbide ceramic, silicon nitride ceramic or recrystallized ceramic, either alone or in combination to form a wear-resistant ceramic layer.

[0099] Furthermore, the pump housing is assembled with the flow-through parts and the bearing assembly and installed on the bracket. The pump housing is made of QT500-7 material; the metal frame is made of QT500-7 or Q235B material.

[0100] Example 1

[0101] As shown in Figures 1 and 2, a large-scale wear-resistant ceramic and rubber composite metal slurry pump for mineral processing in this embodiment includes a bracket 1, a bearing assembly 2, a stuffing box 3, a pump casing 4, a front guard plate 5, a rear guard plate 6, a front sleeve 7, a rear sleeve 8 and an impeller 9.

[0102] As shown in FIG3 , the front guard plate 5 includes a guard plate rubber layer 10, a guard plate ceramic layer 11 and a guard plate metal frame 12; the guard plate rubber layer 10 covered on the surface of the guard plate ceramic layer 10 has a thickness of 10 mm;

[0103] As shown in FIG4 , in this embodiment, the guard plate ceramic layer 10 is divided into a circle along the radial direction, and each circle is divided into 8 sector-shaped guard plate ceramic blocks 10a, which are placed on the surface of the guard plate metal skeleton 12 along the circumferential direction; first limit blocks 13 are arranged at equal intervals on the periphery of the guard plate ceramic blocks 10a to prevent the guard plate ceramic blocks 10a from shifting in the outer diameter direction when the rubber is vulcanized; the first limit blocks 13 are fixed to the guard plate metal skeleton 12 by welding;

[0104] The guard plate ceramic block 10a is fan-shaped, as shown in Figure 5, with a dovetail groove 14 on the bottom and several grooves 15 around the four sides. When the rubber is vulcanized, the dovetail groove 14 and the groove 15 are filled with rubber material, which plays a bonding and buffering role between the guard plate ceramic blocks 10a; the cross-section of the groove 15 is circular.

[0105] As shown in Figures 7 and 8, the front sheath 7 includes a sheath rubber layer 16, a sheath ceramic layer 17, and a sheath metal skeleton 18. In this embodiment, according to the wear of the slurry pump, in the tongue area of ​​the sheath rubber layer, the sheath ceramic layer 17 is divided into two sheath ceramic blocks 17a along the circumferential direction of the sheath rubber layer. As shown in Figure 9, the sheath ceramic block 17a is fixed to the sheath metal skeleton 18 by an adhesive. A second limit block 13a is provided on the edge of the sheath ceramic block 17a to prevent circumferential displacement, and then embedded into the sheath rubber layer.

[0106] As shown in FIG10 , the top and bottom contact edges of the sheathed ceramic block 17a are beveled at 10° to ensure that the sheathed ceramic block is in surface contact with the mold when subjected to vulcanization pressure, thereby preventing localized force from crushing the ceramic.

[0107] The sheath ceramic block 17a is about 8mm away from the rubber flow surface and about 20mm away from the front and rear sheath contact sealing surfaces to prevent the sheath ceramic layer 17 from being crushed when the sheath rubber layer is installed;

[0108] As shown in Figures 11 and 12, the impeller 9 includes an impeller ceramic block 19, an impeller metal frame 20, and an impeller rubber layer 21. The impeller ceramic block 19 is embedded in the impeller's easily worn areas, including: the impeller inlet circumference, the inner circumference of the front cover plate, the inner circumference of the rear cover plate, the outer circumference of the rear cover plate, and the blade working surface. The impeller ceramic block 19 is pre-fixed to the impeller metal frame 20 with an adhesive, and the impeller ceramic block 19 is placed in a mold together and molded by injection rubber vulcanization.

[0109] As shown in Figures 13-15, the impeller inlet circumferential ceramic block 19a is evenly divided into 5 blocks along the circumferential direction of the inlet, and the number is consistent with the number of impeller blades; the inner circumferential ceramic block 19b of the front cover plate, the inner circumferential ceramic block 19c of the rear cover plate, and the blade working surface ceramic block 19e can be divided into multiple blocks according to the impeller diameter and wear area to prevent the ceramic from being broken under stress; the outer circumferential ceramic block 19d of the rear cover plate is fan-shaped distributed along the outer diameter direction of the impeller and is evenly divided into 15; the rubber covering the surface of the impeller ceramic block 19 is 8 mm thick.

[0110] In this embodiment, the wear-resistant ceramic material used for the guard plate ceramic layer 10, the jacket ceramic layer 16 and the impeller ceramic block 19 can be reaction-sintered silicon carbide ceramic.

[0111] The above ceramic and rubber composite metal flow parts are trial-produced, and the pump housing 4, the flow parts and the bearing assembly 2 are assembled and installed on the bracket 1. In this embodiment, the pump housing 4 is made of QT500-7 material; all metal frames are made of Q235B material.

[0112] Example 2

[0113] The large-scale wear-resistant ceramic and rubber composite metal slurry pump for mineral processing in this embodiment includes a bracket 1, a bearing assembly 2, a stuffing box 3, a pump casing 4, a front guard plate 5, a rear guard plate 6, a front sleeve 7, a rear sleeve 8 and an impeller 9.

[0114] The front guard plate 5 includes a guard plate rubber layer 10, a guard plate ceramic layer 11 and a guard plate metal frame 12; the guard plate rubber layer 10 covered on the surface of the guard plate ceramic layer 10 has a thickness of 12 mm;

[0115] In this embodiment, the guard plate ceramic layer 10 is divided into two circles along the radial direction, and each circle is divided into eight sector-shaped guard plate ceramic blocks 10a, which are placed on the surface of the guard plate metal frame 12 along the circumferential direction; the guard plate ceramic blocks in two adjacent circles are staggered, and the guard plate ceramic blocks 10a of the outer circle are aligned with the outer edge of the guard plate. When vulcanizing the rubber, the mold is used for positioning, and no limit blocks are provided;

[0116] The guard plate ceramic block 10a is fan-shaped, as shown in FIG6 , with nine glue holes 14a having a diameter of 10 mm and a number of grooves 15 formed around the four sides. When the rubber is vulcanized, the glue holes 14a and the grooves 15 are filled with rubber material, which acts as a bond and buffer between the guard plate ceramic blocks 10a. During vulcanization, the glue holes 14a also serve to discharge air from the surface of the ceramic block.

[0117] The front jacket 7 includes a jacket rubber layer 16, a jacket ceramic layer 17, and a jacket metal frame 18. In this embodiment, according to the wear of the slurry pump, in the tongue area of ​​the jacket rubber layer 16, the jacket ceramic layer 17 is divided into two jacket ceramic blocks 17a along the circumferential direction of the jacket rubber layer 16. As shown in FIG9 , the jacket ceramic block 17a is fixed to the jacket metal frame 18 by an adhesive. A second limit block 13a is provided on the edge of the jacket ceramic block 17a to prevent circumferential displacement, and then the jacket ceramic block 17a is embedded in the jacket rubber layer 16.

[0118] The top and bottom contact edges of the sheath ceramic block 17a are beveled at 10° to ensure that the sheath ceramic block is in surface contact with the mold when subjected to vulcanization pressure, thereby preventing localized force from crushing the ceramic.

[0119] The sheath ceramic block 17a is about 8mm away from the rubber flow surface and about 20mm away from the front and rear sheath contact sealing surfaces to prevent the sheath ceramic layer 17 from being crushed when the sheath rubber layer 16 is installed;

[0120] The impeller 9 includes an impeller ceramic block 19, an impeller metal frame 20, and an impeller rubber layer 21. The impeller ceramic block 19 is embedded in the wear-prone areas of the impeller, including: the impeller inlet circumference, the inner circumference of the front cover plate, the inner circumference of the rear cover plate, the outer circumference of the rear cover plate, and the blade working surface. The impeller ceramic block 19 is pre-fixed on the impeller metal frame 20 with an adhesive, and the impeller ceramic block 19 is placed in a mold together and molded by injection rubber vulcanization.

[0121] The impeller inlet circumferential ceramic block 19a is evenly divided into 5 blocks along the circumferential direction of the inlet, and the number is consistent with the number of impeller blades; the inner circumferential ceramic block 19b of the front cover plate, the inner circumferential ceramic block 19c of the rear cover plate, and the blade working surface ceramic block 19e can be divided into multiple blocks according to the impeller diameter and wear area to prevent the ceramic from being broken under stress; the outer circumferential ceramic block 19d of the rear cover plate is fan-shaped distributed along the outer diameter direction of the impeller and is evenly divided into 15; the rubber covering the surface of the impeller ceramic block 19 is 8 mm thick.

[0122] In this embodiment, the wear-resistant ceramic material used for the guard plate ceramic layer 10, the jacket ceramic layer 16 and the impeller ceramic block 19 can be reaction-sintered silicon carbide ceramic.

[0123] The above ceramic and rubber composite metal flow parts are trial-produced, and the pump housing 4, the flow parts and the bearing assembly 2 are assembled and installed on the bracket 1. In this embodiment, the pump housing 4 is made of QT500-7 material; all metal frames are made of Q235B material.

[0124] Example 3

[0125] This embodiment provides a method for preparing a composite material of wear-resistant ceramic and rubber-metal composites, the method comprising: first cleaning the ceramic block with toluene, first brushing a curing agent on the surface, and then brushing a layer of rubber adhesive to a thickness of 1 mm; after standing for 2 hours, laminating the ceramic block with a metal frame and placing it in a mold to improve initial bonding strength and positioning; and then performing a rubber vulcanization process to form the ceramic block at a vulcanization temperature of 140°C, a vulcanization pressure of 150 bar, and a vulcanization time of 4 hours;

[0126] The curing agent is a two-layered adhesive, which is divided into a primer and a top coat. The primer is made of CH205 and the diluents are butanone or acetone. The top coat is made of CH220 and the diluents are xylene or toluene. The rubber adhesive is a polymer of rubber particles and glue, which is used to enhance the adhesion between rubber and ceramics.

[0127] Example 4

[0128] This embodiment provides another multi-material composite guard plate for a slurry pump, comprising a rubber layer, a wear-resistant ceramic layer, and a metal frame. A plurality of threaded holes are provided on one side of the metal frame for screwing in screws to secure the guard plate in a desired position. Further:

[0129] An annular groove is provided on the other side surface of the guard plate metal skeleton, and the wear-resistant ceramic layer is located in the annular groove. Usually, the annular groove is filled with an adhesive, and the adhesive can use resin, rubber or metal glue (the same below), so that the guard plate metal skeleton can be better fixed after solidification. At the same time, the wear-resistant ceramic layer and the guard plate metal skeleton are embedded in the rubber layer through a vulcanization injection molding process. Generally speaking, there is a gap of 2-3mm between the outer edge of the wear-resistant ceramic layer and the corresponding edge of the annular groove to avoid direct contact. In this way, not only the guard plate metal skeleton and the wear-resistant ceramic layer are better combined, but also the elasticity of the rubber and the wear resistance of the ceramic are organically combined, which effectively extends the service life of the guard plate. Optimized:

[0130] The wear-resistant ceramic layer includes an inner ring and an outer ring. Obviously, the outer ring is sleeved on the outside of the inner ring. The outer edge of the inner ring is provided with a number of internal positioning opening grooves, and the inner edge of the outer ring is provided with a number of external positioning opening grooves. The internal positioning opening grooves and the external positioning opening grooves correspond to each other, and adhesive is injected between the internal positioning opening grooves and the corresponding external positioning opening grooves. That is, the internal positioning opening grooves and the external positioning opening grooves are both semicircular but not limited to semicircular shapes, and the corresponding internal positioning opening grooves and the external positioning opening grooves are aligned to form a relatively closed circle (or other closed shape), and the adhesive in the annular groove also enters the inside of the formed circle. After the adhesive solidifies, the position of the inner ring and the outer ring is more stable;

[0131] The separate design makes processing more convenient.

[0132] The inner ring is evenly divided into an even number of inner unit segments, for example, 8 segments, each of which is fan-shaped, and an inner unit positioning opening groove is provided on the connecting edge of the inner unit segment, and the inner unit positioning opening grooves on adjacent inner unit segments correspond to each other. The so-called connecting edge refers to the edge where two adjacent inner unit segments are close together. In addition, an adhesive is injected between the inner unit positioning opening groove and the corresponding inner unit positioning opening groove. Similarly, the outer ring is evenly divided into an even number of outer unit segments, for example, 8 segments, each of which is fan-shaped. An outer unit positioning opening groove is provided on the connecting edge of the outer unit segment, and the outer unit positioning opening grooves on adjacent outer unit segments correspond to each other; the so-called connecting edge refers to the edge where two adjacent outer unit segments are close together. In addition, an adhesive is injected between the outer unit positioning opening groove and the corresponding outer unit positioning opening groove. That is, the inner and outer rings are also divided into several sections, and the solidified adhesive is stuck in the circular holes formed by the corresponding inner unit positioning opening grooves and the corresponding outer unit positioning opening grooves, further reducing the difficulty of processing. The solidified adhesive makes the inner and outer rings of the split design more tightly combined. Further optimization:

[0133] The number of inner and outer unit segments is equal, and the inner and outer unit segments are staggered. That is, the junction of two inner unit segments is located exactly in the middle of the inner edge of an outer unit segment. This further enhances the integrity of the junction.

[0134] In this embodiment, the wear-resistant ceramic layer is made of recrystallized ceramic material.

[0135] Example 5

[0136] This embodiment provides a composite sheath for a slurry pump, which is usually used in conjunction with a front sheath and a rear sheath that are symmetrically distributed front and back. This embodiment is described using one sheath (front sheath or rear sheath). Specifically:

[0137] The sheath includes a sheath rubber layer, a sheath metal frame, and a partition tongue (sheath ceramic block). The partition tongue is prefabricated with heavy-duty silicon carbide ceramic material. A groove is provided on the back of the partition tongue, and a protrusion is provided on the sheath metal frame, and the groove and the protrusion match. That is, during assembly, the protrusion is stuck in the corresponding groove, and the back of the partition tongue and the side of the protrusion of the sheath metal frame fit together. At the same time, after the sheath metal frame and the partition tongue are assembled together, they are embedded in the sheath rubber layer as a whole using a rubber injection molding process. That is, the sheath rubber layer covers the sheath metal frame and the partition tongue as a whole. In this way, by organically combining the high wear resistance of ceramics and the good elasticity of rubber, and providing the partition tongue with a relatively stable support, the service life of the sheath is effectively extended.

[0138] Optimized:

[0139] The thickness of the rubber sheath covering the tongue is 5-10 mm. Specifically, the tongue's surface is 5-10 mm from the flow-through surface of the rubber sheath. This optimally designed rubber sheath protects the tongue from significant vibration and slurry impact during use, reducing the likelihood of the tongue falling off or cracking.

[0140] The cross-section of the groove is circular, square, or other irregular shapes. The cross-section refers to the transverse section, not the longitudinal section. The sheath metal frame is provided with a plurality of metal blocks for forming bolt holes in the sheath metal frame. The metal blocks can be pre-attached to the metal frame by welding or other means, or they can be formed by increasing the thickness of the metal frame during fabrication.

[0141] Example 6

[0142] This embodiment provides another impeller for a slurry pump, wherein the impeller comprises a wear-resistant ceramic layer, an impeller rubber layer, and an impeller metal frame composed of a front cover plate, a rear cover plate, and a plurality of blades.

[0143] Among them, the impeller metal skeleton can improve the stability of the mechanical performance of the slurry pump impeller.

[0144] The front cover plate and the rear cover plate are arranged opposite to each other, a plurality of blades are arranged between the front cover plate and the rear cover plate, and the front cover plate and the rear cover plate are connected through the plurality of blades.

[0145] The wear-resistant ceramic layer is arranged on the surface of the impeller metal skeleton, the impeller rubber layer includes a first impeller rubber layer and a second impeller rubber layer, the first impeller rubber layer is arranged between the wear-resistant ceramic layer and the impeller metal skeleton, and the second impeller rubber layer is arranged on the surface of the wear-resistant ceramic layer and the impeller metal skeleton.

[0146] Among them, the impeller rubber layer is formed on the surface of the wear-resistant ceramic layer and the impeller metal frame and between the wear-resistant ceramic layer and the impeller metal frame by a vulcanization injection process, playing a bonding and buffering role.

[0147] Among them, in order to prevent the wear-resistant ceramic layer from moving when injecting the impeller rubber layer, the wear-resistant ceramic layer is pre-fixed on the impeller metal frame by adhesive. After pre-fixation, the impeller metal frame and the wear-resistant ceramic layer are placed in the mold as a whole, and the impeller rubber layer is filled into the gap between the wear-resistant ceramic layer and the impeller metal frame by injection.

[0148] By providing a wear-resistant ceramic layer on the surface of the impeller metal skeleton, the high hardness, wear resistance, and corrosion resistance of the ceramic are utilized to improve the local wear resistance of the slurry pump impeller. By providing a first impeller rubber layer between the wear-resistant ceramic layer and the impeller metal skeleton, and providing a second impeller rubber layer on the surface of the wear-resistant ceramic layer and the impeller metal skeleton, the elasticity and impact absorption properties of the first and second impeller rubber layers are utilized to reduce the impact of solid particles on the wear-resistant ceramic layer, thereby reducing the risk of slurry pump impeller fragmentation.

[0149] An impeller suction port is provided in the middle of the front cover plate, wherein the fluid enters the slurry pump impeller from the impeller suction port.

[0150] Among them, the wear-resistant ceramic layer includes a first wear-resistant ceramic layer, a second wear-resistant ceramic layer, a third wear-resistant ceramic layer and a fourth wear-resistant ceramic layer. The first wear-resistant ceramic layer is arranged on the inner side of the front cover plate facing the rear cover plate, the second wear-resistant ceramic layer is arranged on the inner side of the rear cover plate facing the front cover plate, the third wear-resistant ceramic layer is arranged on the outer side of the rear cover plate facing the front cover plate, and the fourth wear-resistant ceramic layer is arranged on the working surface of each blade.

[0151] Among them, the wear-resistant ceramic layer is set in the areas of the slurry pump impeller that are prone to wear (the inner side of the front cover facing the rear cover, the inner side of the rear cover facing the front cover, the outer side of the rear cover facing the front cover and the working surface of the blade) based on usage experience.

[0152] Among them, the first wear-resistant ceramic layer includes multiple first wear-resistant ceramic blocks, and the multiple first wear-resistant ceramic blocks are arranged at intervals along the circumferential direction of the inner side surface of the front cover plate; the second wear-resistant ceramic layer includes multiple second wear-resistant ceramic blocks, and the multiple second wear-resistant ceramic blocks are arranged at intervals along the circumferential direction of the inner side surface of the rear cover plate; the third wear-resistant ceramic layer includes multiple third wear-resistant ceramic blocks, and the multiple third wear-resistant ceramic blocks are arranged at intervals along the circumferential direction of the outer side surface of the rear cover plate; the fourth wear-resistant ceramic layer includes multiple fourth wear-resistant ceramic blocks, and multiple fourth wear-resistant ceramic blocks are arranged at intervals on the working surface of each blade.

[0153] The first, second, and third wear-resistant ceramic layers are divided into small blocks along the circumference of the front and rear covers, based on the slurry pump impeller diameter and the ceramic molding process. The fourth wear-resistant ceramic layer is divided into small blocks spaced apart on the blades. This design addresses the difficulty of scaling up wear-resistant ceramics. Furthermore, dividing the first, second, third, and fourth wear-resistant ceramic layers into small blocks reduces the cost of the slurry pump impeller.

[0154] Among them, the number of the first wear-resistant ceramic block, the second wear-resistant ceramic block, the third wear-resistant ceramic block and the fourth wear-resistant ceramic block can be the same or different. Those skilled in the art can set it according to actual conditions and no specific limitation is made here.

[0155] The plurality of first wear-resistant ceramic blocks include at least one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide ceramics-bonded silicon carbide ceramics, and recrystallized ceramics.

[0156] For example, the plurality of first wear-resistant ceramic blocks are all silicon carbide ceramics, or a portion of the plurality of first wear-resistant ceramic blocks are silicon carbide ceramics, and the remaining portion are silicon nitride-bonded silicon carbide ceramics. In other words, the plurality of first wear-resistant ceramic blocks can be composed of any one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide ceramic-bonded silicon carbide ceramics, and recrystallized ceramics, either alone or in combination.

[0157] The plurality of second wear-resistant ceramic blocks include at least one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide ceramics-bonded silicon carbide ceramics, and recrystallized ceramics.

[0158] For example, the plurality of second wear-resistant ceramic blocks are all silicon carbide ceramics, or some of the plurality of second wear-resistant ceramic blocks are silicon carbide ceramics, and the remaining ceramic blocks are silicon nitride-bonded silicon carbide ceramics. In other words, the plurality of second wear-resistant ceramic blocks can be composed of any one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide ceramic-bonded silicon carbide ceramics, and recrystallized ceramics, either alone or in combination.

[0159] The plurality of third wear-resistant ceramic blocks include at least one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide ceramics-bonded silicon carbide ceramics, and recrystallized ceramics.

[0160] For example, the plurality of third wear-resistant ceramic blocks are all silicon carbide ceramics, or some of the plurality of third wear-resistant ceramic blocks are silicon carbide ceramics, and the remaining ceramic blocks are silicon nitride-bonded silicon carbide ceramics. In other words, the plurality of third wear-resistant ceramic blocks can be composed of any one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide ceramic-bonded silicon carbide ceramics, and recrystallized ceramics, either alone or in combination.

[0161] The plurality of fourth wear-resistant ceramic blocks include at least one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide-bonded silicon carbide ceramics, and recrystallized ceramics.

[0162] For example, the plurality of fourth wear-resistant ceramic blocks are all silicon carbide ceramics, or some of the plurality of fourth wear-resistant ceramic blocks are silicon carbide ceramics, and the remaining ceramic blocks are silicon nitride-bonded silicon carbide ceramics. In other words, the plurality of fourth wear-resistant ceramic blocks can be composed of any one of silicon carbide ceramics, silicon nitride-bonded silicon carbide ceramics, silicon oxide ceramic-bonded silicon carbide ceramics, and recrystallized ceramics, either alone or in combination.

[0163] Wherein, a plurality of glue holes are respectively provided on the surfaces of the front cover plate and the rear cover plate.

[0164] The rubber is injected into the gap between the wear-resistant ceramic layer and the metal frame through the glue holes, thereby forming the first impeller rubber layer. The multiple glue holes facilitate injection of the first impeller rubber layer and help uniformize the first impeller rubber layer.

[0165] Among them, those skilled in the art can set the number of glue holes according to actual conditions, and no specific limitation is made here.

[0166] The diameter of each glue hole ranges from 10 to 20 mm.

[0167] Among them, the impeller rubber layer is used as a flexible and wear-resistant material.

[0168] Among them, the flexible wear-resistant material is highly elastic wear-resistant rubber.

[0169] A raised portion is provided in the middle of the rear cover plate, and a threaded hole for matching and connecting with the pump shaft of the slurry pump is provided at the center of the raised portion.

[0170] Wherein, the shape of each blade is arc-shaped.

[0171] In summary, the slurry pump impeller provided in this embodiment is capable of improving the local wear resistance of the slurry pump impeller by arranging a wear-resistant ceramic layer on the surface of the impeller metal skeleton and utilizing the high hardness, wear resistance and corrosion resistance of the ceramic. By arranging an impeller rubber layer (first impeller rubber layer) between the wear-resistant ceramic layer and the metal skeleton, and arranging an impeller rubber layer (second impeller rubber layer) on the surface of the wear-resistant ceramic layer and the metal skeleton, and utilizing the elasticity and impact absorption characteristics of the impeller rubber layer, the impact of solid particles on the wear-resistant ceramic layer can be reduced, thereby reducing the risk of fragmentation of the slurry pump impeller. In addition, the slurry pump impeller has a built-in metal skeleton, so the mechanical properties are stable. Therefore, the slurry pump impeller has better wear resistance, impact resistance and stability, and a long service life.

[0172] The protection content of the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the inventive concept, changes and advantages that can be thought of by those skilled in the art are included in the present invention and are protected by the appended claims.

Claims

1. A large-scale wear-resistant ceramic and rubber composite metal slurry pump for mineral processing, characterized in that: The slurry pump comprises: a bracket (1), a bearing assembly (2), a stuffing box (3), a pump casing (4) and a flow passage member; wherein the flow passage member comprises: a front guard plate (5), a rear guard plate (6), a front sleeve (7), a rear sleeve (8) and an impeller (9), all of which adopt a composite structure of wear-resistant ceramic blocks and rubber-composite metals, and rubber is filled between the wear-resistant ceramic blocks and the metal frame surface, and / or between the wear-resistant ceramic blocks and the metal frame to form a rubber layer; the wear-resistant ceramic blocks are bonded to the metal frame of the wear-prone area of ​​the flow passage member by rubber and / or adhesive; the wear-prone area refers to an area near the flow passage member where the fluid linear velocity is greater than 20m / s and / or backflow occurs.

2. The slurry pump according to claim 1, characterized in that: The wear-prone area is obtained by simulation calculation using computational fluid dynamics and discrete element software Rocky coupling calculation method, and the degree of wear is determined by analyzing the wear amount of the flow-through parts and the distribution area and size of the solid particle volume fraction.

3. The slurry pump according to claim 1, characterized in that: The adhesive is selected from epoxy resin structural adhesive and / or AB adhesive; the bonding strength of the adhesive is not less than 10MPa; The ceramic block is made of wear-resistant ceramic material, including one or more of silicon carbide ceramic, silicon nitride ceramic or recrystallized ceramic; the density of the ceramic block is not less than 3.03g / cm 3 , hardness not less than 90HRA; flexural strength not less than 350MPa; The radial dimension of the ceramic block does not exceed 350 mm, the outer diameter width does not exceed 350 mm; the thickness ranges from 15 to 35 mm; The gaps between the ceramic blocks and / or between the ceramic blocks and the metal frame are filled with vulcanized rubber; The metal skeleton is made of high chromium alloy, Q235B carbon structural steel or QT500-7 ductile iron.

4. The slurry pump according to claim 1, characterized in that: The front guard plate (5) and / or the rear guard plate (6) both include a guard plate rubber layer (10), a guard plate ceramic layer (11) and a guard plate metal frame (12); the guard plate ceramic layer (11) and the guard plate rubber layer (10) are composited on the surface of the guard plate metal frame (12); the guard plate metal frame (12) includes an integrated hollow metal cylinder and a flat metal ring fixed to one end of the hollow metal cylinder, the inner ring size of the flat metal ring matches the inner diameter of the hollow metal cylinder; an annular groove is provided on the lower surface of the guard plate metal frame (12), and the guard plate ceramic layer (11) is provided in the annular groove; the guard plate rubber layer (10) is provided on the inner surface of the hollow metal cylinder and the lower surface of the guard plate metal frame (12), and / or the guard plate rubber layer (10) is provided between the wear-resistant ceramic block and the guard plate metal frame (12); The thickness of the guard plate rubber layer (10) is 0-20 mm.

5. The slurry pump according to claim 4, characterized in that: The guard plate ceramic layer (11) is divided into M circles along the radial direction according to the diameter of the guard plate and the ceramic forming process, and each circle is divided into N guard plate ceramic blocks (10a); wherein, Among them, D2 is the outer diameter of the guard plate; D1 is the inner diameter of the guard plate; D i is the outer diameter circumference of the i-th circle; L1 is the radial height of the ceramic block; L2 is the outer diameter width of the ceramic block; The guard plate ceramic block (10a) is fan-shaped, with a radial dimension not exceeding 350 mm and an outer diameter width not exceeding 350 mm; the thickness ranges from 15 to 35 mm; a dovetail groove (14) and / or a glue hole (14a) is provided at the bottom of the guard plate ceramic block (10a), and a plurality of grooves (15) are provided around the four sides; The number of the dovetail grooves (14) is 2-3, and the width range is 12-30 mm; The diameter of the glue holes (14a) is 10-20 mm, and the number is 9-16; The number of the grooves (15) is 8-12, and the width is 10-30 mm. When vulcanizing rubber, the dovetail groove (14) and / or the glue hole (14a) and the groove (15) are filled with rubber material to provide bonding and buffering between the guard plate ceramic blocks (10a). The cross-sectional shape of the groove (15) includes: rectangular or circular.

6. The slurry pump according to claim 5, characterized in that: The guard plate ceramic layer (11) is divided into one or more circles. When the guard plate ceramic layer (11) is one circle, first limit blocks (13) are arranged at equal intervals on the periphery of the guard plate ceramic block (10a); the first limit blocks (13) are fixed to the guard plate metal frame (12) by welding; When the guard plate ceramic layer (11) is larger than one circle, the guard plate ceramic blocks (10a) in two adjacent circles are staggered, the guard plate ceramic blocks (10a) in the outer circle are aligned with the outer edge of the guard plate, and no limiting blocks are provided.

7. The slurry pump according to claim 1, characterized in that: The front sheath (7) and the rear sheath (8) both comprise a sheath rubber layer (16), a sheath ceramic layer (17) and a sheath metal frame (18); The sheath ceramic layer (17) is arranged at a wear-prone position of the sheath and is divided into N sheath ceramic blocks (17a) along the circumferential direction of the sheath; the sheath metal skeleton (18) is attached to the side wall of the sheath rubber layer (16); the sheath ceramic blocks (17a) are fixed to the sheath metal skeleton (18) by adhesive; the sheath ceramic layer (17) is provided with second limit blocks (13a) along both sides of the sheath metal skeleton (18); the second limit blocks (13a) are welded to the sheath metal skeleton (18), and the edge gap between the second limit blocks (13a) and the sheath ceramic blocks (17a) is 3-5 mm; The sheath ceramic block (17a) and the second limiting block (13a) are both embedded in the sheath rubber layer (16); The curved surface shape of the sheath ceramic block (17a) is consistent with the flow surface of the sheath, and the circumferential and radial dimensions do not exceed 350 mm; the thickness does not exceed 35 mm; The top contact edge and the bottom contact edge of the sheath ceramic block (17a) are respectively provided with bevel angles, and the bevel angle range is 0-15°; The sheath ceramic block (17a) is about 0-15 mm away from the flow surface and about 20-30 mm away from the front and rear sheath contact sealing surfaces.

8. The slurry pump according to claim 1, wherein: The impeller (9) comprises an impeller ceramic block (19), an impeller metal frame (20) and an impeller rubber layer (21); the impeller ceramic block (19) is embedded in an impeller area susceptible to wear; the area susceptible to wear comprises the impeller inlet circumference, the inner circumference of the front cover plate, the inner circumference of the rear cover plate, the outer circumference of the rear cover plate, and the blade working surface; the impeller ceramic block (19) comprises an impeller inlet circumference ceramic block (19a), a front cover plate inner circumference ceramic block (19b), a rear cover plate inner circumference ceramic block (19c), a rear cover plate outer circumference ceramic block (19d), and a blade working surface ceramic block (19e); the impeller ceramic block (19) is pre-fixed on the impeller metal frame (20) with an adhesive, placed together in a mold, and molded by injection rubber vulcanization.

9. The slurry pump according to claim 8, characterized in that: The number of the impeller inlet circumferential ceramic blocks (19a) evenly divided along the inlet circumferential direction is consistent with the number of impeller blades; the front cover plate inner circumferential ceramic blocks (19b), the rear cover plate inner circumferential ceramic blocks (19c), and the blade working surface ceramic blocks (19e) are complete ceramic blocks or divided into multiple ceramic blocks; the rear cover plate outer circumferential ceramic blocks (19d) are fan-shaped distributed along the impeller outer diameter direction and are evenly divided into N pieces; The thickness of the rubber covering the surface of the impeller ceramic block (19) is 0-15 mm.

10. A method for preparing a composite material of wear-resistant ceramic and rubber composite metal, characterized in that: The preparation method includes: cleaning a ceramic block with toluene, first brushing a curing agent on the surface of the ceramic block, and then brushing a layer of rubber adhesive with a thickness of 0.5-2 mm; after being left for 2-3 hours, laminating the ceramic block with a metal frame and placing the block in a mold to improve initial bonding strength and positioning, and performing a rubber vulcanization process to form the block at a vulcanization temperature of 120-150° C., a vulcanization pressure of 130-170 bar, and a vulcanization time of 3-4 hours to form a rubber layer.

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