CN219615819U - Wear-resistant ceramic composite wear-resistant block for horizontal decanter centrifuge - Google Patents

Abstract

The utility model discloses a wear-resistant ceramic composite wear-resistant block for a horizontal decanter centrifuge, which comprises the following components: a base for connection with the helical blade; a cemented carbide piece connected to the substrate; and the ceramic piece is respectively connected with the matrix and the hard alloy block. The spiral abrasion-resistant block has longer service life, can better protect the spiral steel blade, can realize small abrasion in the two-year overhaul period, and can not damage the middle shaft.

Description

Wear-resistant ceramic composite wear-resistant block for horizontal decanter centrifuge

Technical Field

The utility model relates to the technical field of coal gasification black water separation, in particular to a wear-resistant ceramic composite wear-resistant block for a horizontal decanter centrifuge.

Background

The horizontal spiral discharging sedimentation centrifuge is an automatic device which utilizes a rotary drum to rotate at high speed to generate centrifugal force to separate materials with different densities. The rotary drum is driven by a motor and rotates at a certain differential speed and the same direction with the spiral pusher at a high speed. The material is continuously introduced into the rotary drum through a feed pipe, and under the action of a centrifugal force field, heavier solid phase matters are deposited on the wall of the rotary drum to form a slag layer. The spiral conveyer continuously pushes the deposited solid phase matters to the cone section of the rotary drum and is discharged out of the machine through a slag discharge port. The lighter liquid phase forms an inner liquid ring, continuously overflows the rotary drum through the overflow port at the large end of the rotary drum, and is discharged out of the machine through the liquid discharge port.

The traditional centrifugal machine has great problems in the black water and ash water separation application in the coal gasification chemical industry. The solid phase in the black water and the ash water is the coke residue after coal combustion, the particle size is larger, the hardness is very high, and the abrasion is very high. Conventional centrifuges use either conventional cemented carbide or higher hardness steel. In the separation process, the coke residues tend to rub against various steel or hard alloy parts constituting the centrifugal machine, so that huge abrasion of parts is caused. At present, the overhaul time of the traditional centrifuge adopted in the coal gasification chemical industry is only 6 months, and the production of enterprises is greatly influenced.

The materials enter a feeding bin in a spiral center shaft of the spiral pusher through a feeding pipe, and then enter the inside of the rotary drum through a spiral feeding hole for centrifugal separation. The screw feed inlet is provided with a wear-resistant sleeve, and is generally arranged on the screw discharge outlet in a screw or bonding mode. The general material is hard alloy. The screw feed has a square or circular shape, with a square feed being most advantageous for wear because of the minimal wear (circular wear being at a point where the greatest wear occurs). In the application of coal gasification chemical black water separation, the service life of the hard alloy wear-resistant sleeve at the discharge hole of the spiral central shaft is only 3-6 months, and the central shaft is broken in a quite short time after abrasion, so that serious equipment accidents are caused.

Disclosure of Invention

The utility model aims to provide a wear-resistant ceramic composite wear-resistant block for a horizontal decanter centrifuge, which aims to solve the technical problem in the background technology.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a wear resistant ceramic composite wear resistant block for a decanter centrifuge comprising:

a base for connection with the helical blade;

a cemented carbide piece connected to the substrate;

and the ceramic piece is respectively connected with the matrix and the hard alloy block.

In some embodiments, the base body is provided with a mounting clamping table on one side facing the spiral blade, and the base body is subjected to limit mounting through the mounting clamping table; the base body is provided with a first installation step at one side far away from the spiral blade, the width of the first installation step is smaller than the thickness of the hard alloy block, and silver brazing is adopted between the hard alloy block and the base body.

In some embodiments, a second mounting step is provided at the bottom of the ceramic sheet, the ceramic sheet is bonded to the side of the cemented carbide piece, and the second mounting step is bonded to the bottom surface of the cemented carbide piece and the side of the first mounting step, respectively.

In some embodiments, the substrate is a stainless steel substrate.

Compared with the prior art, the utility model has the following beneficial effects:

1. the spiral abrasion-resistant block has longer service life, can better protect the spiral steel blade, can realize small abrasion in the two-year overhaul period, and can not damage the middle shaft.

2. Because the hard alloy block is less prone to brittle failure than the ceramic plate, the wear-resistant block made of the composite material can also protect the steel blade for more than 6 months when the ceramic block is damaged (a small amount) due to external impact.

3. The manufacturing cost is low, the metal cost which is harder than the hard alloy is very high, and only ten yuan of money is added for each block for compounding.

Drawings

FIG. 1 is a schematic diagram of a decanter centrifuge made using a ceramic composite wear block of an embodiment of the present utility model;

FIG. 2 is a part drawing of a decanter centrifuge made with ceramic composite wear blocks of an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a decanter centrifuge made from ceramic composite wear blocks according to an embodiment of the present utility model;

FIG. 4 is a schematic illustration of the construction of a rotating component for a wear resistant decanter centrifuge in accordance with an embodiment of the present utility model;

FIG. 5 is a schematic view of a screw member of an embodiment of the present utility model;

FIG. 6 is a schematic view of the structure of a screw member according to an embodiment of the present utility model;

FIG. 7 is an enlarged view of a portion of FIG. 6A;

FIG. 8 is an enlarged view of a portion of B in FIG. 6;

FIG. 9 is a schematic view of the structure of a cone-shaped straight drum according to an embodiment of the present utility model;

FIG. 10 is an enlarged view of a portion of C in FIG. 9;

FIG. 11 is a schematic illustration of a ceramic composite wear block;

FIG. 12 is a part drawing of a ceramic composite wear block;

FIG. 13 is a schematic structural view of a ceramic composite wear block;

FIG. 14 is a schematic view of a square ceramic feed port;

FIG. 15 is a schematic view of a structure of a square ceramic feed port at a first view angle;

FIG. 16 is a schematic structural view of a square ceramic feed port at a second view angle;

FIG. 17 is a part drawing of a square ceramic feed port;

FIG. 18 is a part view of the upper and lower housings;

FIG. 19 is a schematic view of the structure of the upper and lower housings;

fig. 20 is a partial enlarged view of D of fig. 19;

illustration of: 2-rotating parts, 3-differential safety covers, 4-spline shafts, 5-differentials, 6-main machine vibration isolators, 8-bases, 9-feed pipe brackets, 10-feed pipes, 11-motor driving devices and 12-belt safety covers;

21-a solid-phase end bearing seat, 22-a solid-phase end part, 23-a conical straight rotary drum, 24-a clear liquid end part, 25-a clear liquid end bearing seat, 26-a spiral part, 27-a differential connecting disc and 28-a driven pulley;

31-cone section rotary drums, 32-straight section rotary drums, 33-mosaic ceramic plates, 34-strip-shaped ceramic plates, 35-ceramic discharge ports and 36-metal wear-resistant strips;

41-a spiral center shaft, 43-a square ceramic feed inlet, 44-ceramic plates, 45-spiral blades, 46-ceramic composite wear-resistant blocks, 47-tungsten carbide wear-resistant blocks and 48-a feed bin;

51-a rectangular matrix, 52-a first ceramic plate, 53-a second ceramic plate and 54-a countersunk head screw;

61-ceramic plates, 62-hard alloy blocks and 63-stainless steel matrixes;

71-upper housing, 72-lower housing, 73-upper housing steel liner, 75-lower housing steel liner.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the preferred embodiments of the present utility model will be described in more detail with reference to the accompanying drawings in the preferred embodiments of the present utility model. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the utility model. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be fixedly connected, or indirectly connected through intermediaries, for example, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship of the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or display that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or display.

The following will describe a wear-resistant ceramic composite wear-resistant block for a decanter centrifuge according to an embodiment of the present utility model in detail with reference to fig. 1 to 20. It is noted that the following examples are only for explaining the present utility model and are not to be construed as limiting the present utility model. In order to better illustrate the structure and the working principle, the following description applies to a rotating component structure for a wear-resistant decanter centrifuge.

Example 1:

as shown in fig. 1, a rotary member structure for a wear-resistant decanter centrifuge includes: the device comprises a conical and straight rotary drum 23, a solid-phase end part 22, a clear liquid end part 24, a spiral part 26, a solid-phase end bearing seat 21, a clear liquid end bearing seat 25, a differential mechanism 5 connecting disc and a driven pulley 28.

The cone-shaped straight rotary drum 23 is of a structure with a cavity and two open ends, one end is a solid phase end, and the other end is a clear liquid end; the solid-phase end part 22 is connected with the solid-phase end of the conical straight rotary drum 23; the solid-phase end part 22 is provided with a feeding channel; the clear liquid end part 24 is connected with the clear liquid end of the conical straight rotary drum 23; the clear liquid end part 24 is provided with a plurality of liquid outlet holes; the spiral part 26 is arranged in the cavity, and two ends of the spiral part 26 are respectively connected with bearings on the solid-phase end part 22 and the clear liquid end part 24; so that the spiral member 26 can rotate relative to the conical drum 23;

the spiral part 26 comprises a central shaft and a spiral blade 45 arranged outside the central shaft, a feeding bin 48 is arranged in the central shaft and is communicated with the feeding channel in a sealing way, and a first through discharge hole is formed in the side wall of the central shaft; the solid-phase end bearing seat 21 is used for supporting the solid-phase end part 22, and a bearing is arranged between the solid-phase end bearing seat 21 and the solid-phase end part 22; providing rotational support for the stationary components.

The clear liquid end bearing seat 25 is used for supporting the clear liquid end part 24, and a bearing is arranged between the clear liquid end bearing seat 25 and the clear liquid end part 24; the differential 5 connecting disc is connected with the clear liquid end part 24; the driven pulley 28 is connected to the solid phase end piece 22.

Referring to fig. 1 to 3, for the schematic view of the structure of the rotary part 2 of the present utility model applied to the horizontal decanter centrifuge for coal chemical industry, the upper housing 71 is screwed with the lower housing 72, a relatively airtight cavity is formed after the upper housing 71 is screwed with the lower housing 72, and separated solid phase and liquid phase are discharged from the solid phase end and the liquid phase end of the lower housing 72, respectively. The rotating part 2 comprises a rotating drum part formed by parts such as a clear liquid end bearing seat 25, a clear liquid end part 24, a conical straight rotating drum 23, a spiral part 26, a solid phase end part 22, a solid phase end bearing seat 21, a driven pulley 28, a differential mechanism 5 connecting disc and the like. The clear liquid end part 24, the rotary drum part, the solid phase end part 22, the driven pulley 28 and the differential mechanism 5 are connected by connecting disc screws. Bearings are mounted at both ends of the combination of the spiral member 26 and the drum member so as to be rotatable relative to each other. The bearing seats at the two ends are arranged on the base 8, and the bearings are arranged in the bearing seats, so that the rotating part 2 can rotate. The main motor rotates the driven pulley 28 via a belt. The differential 5 connecting disc is connected with the differential 5 through screws. The differential mechanism 5 is input by hydraulic oil with flow and pressure externally connected with a hydraulic pump station, so that the internal spline of the differential mechanism 5 and the shell of the differential mechanism 5 have opposite rotating speeds, one end of the spline shaft 4 is connected with the internal spline of the differential mechanism 5 in a spline manner, and the other end of the spline shaft is connected with the spiral part 26, thereby providing relative rotating power for the rotary drum part and the spiral part 26.

Referring to fig. 4, the drum forms a container, the rotational speed of which provides centrifugal force so that the material can settle quickly. The spiral pusher pushes the settled solids inside the drum toward the solid phase end (cone section) and the clear liquid flows out along with the countercurrent holes at the clear liquid end.

The differential mechanism 5 safety cover 3 is connected with the base 8 through screws, so that a safety protection effect is achieved. One end of the spline shaft 4 is connected to an internal spline of the differential mechanism 5 through a spline, and the other end of the spline shaft is connected to an internal spline connecting disc of the spiral pusher in the rotating part 2. The internal splines of the differential 5 act in transmission with the helical member 26. The differential mechanism 5 is connected with the rotating part 2 through the screw connection of hydraulic oil with flow and pressure of an external hydraulic pump station, so that the internal spline of the differential mechanism 5 and the differential mechanism 5 shell have a relative rotating speed, and finally, differential rotating speed is provided for the rotary drum part and the screw part 26.

The host vibration isolator 6 is connected with the base 8 through screws, and influences of polarized force generated during operation of the high-speed centrifugal machine on the outside of the foundation are isolated. The feed tube holder 9 is mounted on the rotary member 2 to provide a mounting structure for the feed tube 10. The feeding pipe 10 is connected with the feeding pipe bracket 9 by screws and is an inlet passage for materials. The motor driving device 11 is connected with the base 8 through screws and provides rotating speed and power for the rotating component 2 of the centrifugal machine. The belt safety housing 12 is connected with a motor bottom plate screw on the motor driving device 11, and mainly plays a role in safety protection.

Referring to fig. 18-20, lower housing 72 is welded to base 8, and lower housing 72 is screwed to upper housing 71. The upper housing 71 and the lower housing 72 are screwed together to form a relatively airtight chamber, and the separated solid and liquid phases are discharged from the solid and liquid phase ends of the lower housing 72, respectively.

The upper casing 71 has a mosaic ceramic plate 33 through structural adhesive at a position opposite to the solid phase end of the lower casing 72, the rotary drum rotates at a high speed, and the solid phase thrown out from the discharge port of the conical rotary drum 31 has a very high speed, and the solid phase strikes the inner wall of the casing, so that the casing has very great scouring and abrasion, and particularly the coal gasification industry. The carbon slag separated in the coal gasification industry has very high hardness, and the traditional steel materials, hard alloy and the like can only be used for 3 to 6 months. By sticking the inner wall with the mosaic ceramic sheet 33, i.e. the high hardness ceramic material, zero or very little wear can be achieved, greatly improving the service life of the device.

In order to further play a double-insurance protection role, an upper housing steel lining plate 73 is installed between the mosaic ceramic plates 33 on the upper housing 71, the upper housing steel lining plate 73 is welded with the inner wall at the outlet of the upper housing 71, if the mosaic ceramic plates 33 are partially fallen off, secondary protection can be provided, and the service life of the housing is prolonged.

Similarly, a lower housing steel lining plate 75 is arranged at the outlet of the solid phase end of the lower housing 72, the lower housing steel lining plate 75 is welded with the inner wall of the outlet of the lower housing 72, and a mosaic ceramic plate 33 is arranged on the lower housing steel lining plate 75. If the mosaic ceramic 33 falls off locally, secondary protection can be provided, and the service life of the housing is prolonged.

The main motor rotates the driven pulley 28 via a belt. The differential 5 connecting disc is connected with the differential 5 through screws. The differential mechanism 5 is input by hydraulic oil with flow and pressure externally connected with a hydraulic pump station, so that the internal spline of the differential mechanism 5 and the shell of the differential mechanism 5 have opposite rotating speeds, one end of the spline shaft 4 is connected with the internal spline of the differential mechanism 5 in a spline manner, and the other end of the spline shaft is connected with the spiral part 26, thereby providing relative rotating power for the rotary drum part and the spiral part 26.

Referring to fig. 5 to 10, the tapered straight drum 23 includes: the cone-section rotary drum 31 and the straight-section rotary drum 32 which are connected with each other are respectively provided with a cavity which is communicated with each other, a first wear-resistant layer is arranged on the inner wall of the cavity of the straight-section rotary drum 32, a second wear-resistant layer is arranged on the inner wall of the cavity of the cone-section rotary drum 31, a horizontal section is arranged at the end part of one side, far away from the straight-section rotary drum 32, of the cone-section rotary drum 31, and a plurality of second discharge ports are formed in the horizontal section.

The cone-section rotary drum 31 and the straight-section rotary drum 32 are both used as containers for centrifugal separation, the first wear-resistant layer arranged on the inner wall of the cavity of the straight-section rotary drum 32 and the second wear-resistant layer arranged on the inner wall of the cavity of the cone-section rotary drum 31 can well protect the inner wall of the rotary drum from being worn by scouring, and solid matters are continuously pushed to the cone section of the rotary drum and discharged out of the machine through the second discharge port.

In some embodiments, the first wear-resistant layer includes a first wear-resistant rib, a plurality of the first wear-resistant ribs are disposed on the inner wall of the cavity of the straight drum 32 along the radial direction, and a first mounting cavity is formed between the adjacent first wear-resistant rib and the inner wall of the cavity of the straight drum 32, and the first mounting cavity is filled with a first wear-resistant structure layer. The first wear-resistant structural layer and the first wear-resistant ribs are filled with a structure with a circular cross section, the first wear-resistant ribs can prevent materials in the rotary drum from sliding circumferentially, slag conveying efficiency is improved, and the structure is more wear-resistant than the metal wear-resistant ribs 36.

In some embodiments, the first wear-resistant rib includes a metal wear-resistant strip 36 and an elongated ceramic sheet 34, one section of the first wear-resistant rib is the metal wear-resistant strip 36, the other section is the elongated ceramic sheet 34, the widths and thicknesses of the metal wear-resistant strip 36 and the elongated ceramic sheet 34 are the same, and the metal wear-resistant strip 36 and the elongated ceramic sheet 34 are arranged in a straight line; the elongated ceramic sheet 34 is disposed in a region opposite the first discharge opening of the screw member 26. The first wear-resistant structure layer is a mosaic ceramic plate 33, the strip ceramic plate 34 is thicker than the mosaic ceramic plate 33 by 3mm, and the strip ceramic plate 34 is orderly adhered to the inner wall of the rotary drum to form wear-resistant ribs. The mosaic ceramic sheets 33 are orderly bonded to the inner walls of the cone-section rotary drum 31 and the straight-section rotary drum 32 by using structural adhesive. The gaps between the mosaic ceramic sheets 33 are 2mm, so that the adhesive can be bonded better.

The first wear-resistant rib is made of the metal wear-resistant strip 36 and the long-strip-shaped ceramic sheet 34, mainly considering that firstly, when the material enters the rotary drum from the first discharge port, the speed is not high, the material is accelerated by the rotary drum to the speed that the solid phase and the liquid phase can be separated, the acceleration is that the friction force between the rotary drum and the material, namely the inner wall of the rotary drum, is required to accelerate the material, and the friction force causes the damage to the inner wall of the cavity of the conventional straight rotary drum 32 to be serious, so that the long-strip-shaped ceramic sheet 34 is arranged at the area opposite to the first discharge port of the spiral part 26, namely the side close to the solid phase end, and the metal wear-resistant strip 36 is arranged at the side close to the clear phase end, namely the conventional one metal wear-resistant strip 36 is divided into two materials, and the long-strip-shaped ceramic sheet 34 prevents the circumferential sliding of the material in the rotary drum, thereby improving the slag conveying efficiency and being more wear-resistant than the metal wear-resistant strip 36. Preventing the circumferential sliding of materials in the rotary drum and improving the slag conveying efficiency.

Second, metal wear strips 36 are used because less solid material is present near the clean end and less wear occurs. At the same time, the use of the metal wear strips 36 also increases the overall rigidity of the drum.

In some embodiments, the second wear-resistant layer includes second wear-resistant ribs, a plurality of the second wear-resistant ribs are disposed on the inner wall of the cavity of the cone drum 31 along the radial direction, and a second mounting cavity is formed between the adjacent second wear-resistant ribs and the inner wall of the cavity of the straight drum 32, and the second mounting cavity is filled with a second wear-resistant structure layer. The second wear-resistant ribs can prevent the circumferential sliding of materials in the rotary drum, improve slag conveying efficiency and are more wear-resistant than the metal wear-resistant ribs 36.

In some embodiments, the second wear-resistant structural layer in the second mounting cavity and the second wear-resistant ribs form a truncated cone with a circular cross section. The second wear rib comprises an elongated ceramic sheet 34. The elongated ceramic sheets 34 are more wear resistant than the metal wear strips 36.

In some embodiments, the first wear resistant structural layer filled in the first mounting cavity and the second wear resistant structural layer filled in the second mounting cavity are both mosaic ceramic tiles 33. The mosaic ceramic sheet 33 protects the inner wall of the drum from erosive wear.

In some embodiments, the inner wall of the horizontal section is bonded with a mosaic ceramic plate 33, the second discharge hole is a ceramic discharge hole 35, the ceramic discharge hole 35 is bonded in the horizontal section, and a first clamping table is arranged on the ceramic discharge hole 35, and limiting is performed with the side wall of the horizontal section through the first clamping table.

The mosaic ceramic sheet 33 in the horizontal section also protects the interior of the conical section drum 31, and the ceramic discharge port 35 is bonded to the side wall of the conical section drum 31 by using a structural adhesive. The ceramic discharge port 35 is more wear resistant than the cemented carbide discharge port and does not wear out to a small extent when used in the coal chemical industry.

And be equipped with first block on the ceramic discharge gate 35, carry out spacingly through first block and horizontal segment's lateral wall, both clamp each other, can prevent at the during operation of centrifuge, reduce the influence of centrifugal force to the adhesive shearing force.

In some embodiments, the shape of the helical central shaft 41 is adapted to the shape of the tapered straight drum 23; a third wear-resistant structural layer is attached to the inner wall of the feed bin 48. The third wear-resistant structural layer is a mosaic ceramic tile 33.

In some embodiments, the bottom wall of the feed bin is bonded with a protective ceramic sheet 44. The welding seam between the middle shaft and the baffle is prevented from being worn when materials are accelerated by being adhered to the baffle at the bottom of the feeding bin of the spiral middle shaft 41.

In some embodiments, the first discharging hole is a square ceramic discharging hole 35, the square ceramic discharging hole 35 is adhered to the side wall of the feeding bin, and a second clamping table is arranged on the square ceramic discharging hole 35, and limiting is performed with the side wall of the feeding bin through the second clamping table.

The material enters the spiral center shaft 41 from the feeding pipe 10, enters the drum from the first discharging hole. When the material is fed in, the rotation speed of the screw element 26 is very slow, and the material is thrown out, the first discharge hole surface passing through at this time is very severely washed. The hard alloy sheet with the thickness of 10mm is worn out after 3 months of coal chemical materials, namely the service life of the screw is only half a year, and the production requirement is not met completely.

Referring to fig. 14 to 17, the square ceramic outlet 35 includes: a rectangular base body 51, wherein the rectangular base body 51 is vertically opened and is penetrated in the middle; the second clamping table is arranged on the rectangular base body 51; a first ceramic sheet 52, wherein the first ceramic sheet 52 is disposed on a short side of an inner wall of the rectangular base 51; and a second ceramic sheet 53, wherein the second ceramic sheet 53 is disposed on a long side of the inner wall of the rectangular base 51.

Rectangular base 51 provides a structural member for the stainless steel material for bonding 4 pieces of ceramic blocks. The outlet of the rectangular matrix 51 is arranged in an arc shape. The arc side of the matrix is provided with a threaded hole so that the ceramic can be stably arranged on the matrix.

In some embodiments, the first ceramic plate 52 is provided with a first limiting step on a side far away from the arc end of the rectangular substrate 51, and the rectangular substrate 51 is provided with a second limiting step protruding inwards, and the second limiting step and the first limiting step are mutually matched to limit the movement of the first ceramic plate 52 towards the rectangular substrate 51.

The first ceramic sheet 52 is bonded to the rectangular base 51 with an adhesive; the second ceramic plate 53 is bonded to the rectangular base 51 using an adhesive and is connected using a countersunk screw 54. The first limiting step and the second limiting step are clamped with each other, so that the influence of centrifugal force on the shearing force of the adhesive is reduced.

In some embodiments, the second ceramic piece 53 is provided with a third limiting step on a side far away from the arc end of the rectangular base 51, and the rectangular base 51 is provided with a fourth limiting step protruding inwards, and the fourth limiting step and the third limiting step are mutually matched to limit the movement of the second ceramic piece 53 towards the rectangular base 51. The third limiting step and the fourth limiting step are clamped with each other, so that the influence of centrifugal force on the shearing force of the adhesive is reduced.

In some embodiments, the first discharge ports are provided with a plurality of groups, and the plurality of groups of first discharge ports are arranged in a dispersing manner. For example, 4 groups of 4-6 groups may be equally spaced.

In some embodiments, the spiral blade 45 is provided with a mosaic ceramic plate 33 on the side facing the solid phase end, a ceramic composite wear-resistant block 46 is arranged on the edge of the spiral blade 45 on the side near the solid phase end, and a tungsten carbide wear-resistant block 47 is arranged on the edge of the spiral blade 45 on the side near the clear liquid end; the ceramic composite wear-resistant block 46 and the tungsten carbide wear-resistant block 47 are both arranged on the side of the spiral blade 45 facing the solid phase end.

Because the black water in the coal chemical industry has very high abrasion, the metal can be quickly flushed to cause the breakage of the spiral central shaft 41 and the serious abrasion of the spiral blades 45, so that the material cannot be pushed. This scheme is to protect these two important locations. The main function of the helical blade 45 is to push the separated solid slag towards the second discharge opening of the cone drum 31.

In some embodiments, the ceramic composite wear blocks 46 and the tungsten carbide wear blocks 47 are each closely arranged along the edges of the helical blades 45. The edges of the helical blades 45 are provided with ceramic composite wear blocks 46 at least at the position opposite the feed bin. The stainless steel matrix 63 of the ceramic composite wear block 46 is welded to the helical blade 45 to protect the helical blade 45 from wear by solid slag. The stainless steel matrix 63 of the tungsten carbide wear block 47 is welded to the helical blade 45 to protect the helical blade 45 from abrasion by solid slag, and is not protected by ceramic and is only welded to the clear liquid end because of the proximity to the clear liquid end.

Referring to fig. 11-13, the ceramic composite wear block 46 includes: a substrate, which is a stainless steel substrate 63. The stainless steel matrix 63 serves as a connection. The base body is used for being connected with the spiral blade 45; a cemented carbide piece 62, the cemented carbide piece 62 being attached to the substrate; and a ceramic plate 61, wherein the ceramic plate 61 is respectively connected with the substrate and the hard alloy block 62.

Because of the very high wear of the coal chemicals, the cemented carbide cannot be pushed for a long time at all, and extensive maintenance has shown that the use of cemented carbide pieces 62 alone, helical blades 45, has a service life of less than half a year. After the spiral blade 45 is worn, the material cannot exit to cause solid phase accumulation to further wear the spiral, and then the machine is blocked after the material is not pushed out.

The base body is provided with an installation clamping table on one side facing the spiral blade 45, and the base body is subjected to limit installation through the installation clamping table; the base body is provided with a first mounting step at one side far away from the spiral blade 45, the width of the first mounting step is smaller than the thickness of the hard alloy block 62, and silver brazing is adopted between the hard alloy block 62 and the base body. The bottom of the ceramic piece 61 is provided with a second mounting step, the ceramic piece 61 is bonded with the side surface of the hard alloy block 62, and the second mounting step is bonded with the bottom surface of the hard alloy block 62 and the side surface of the first mounting step respectively.

Since the ceramic sheet 61 is hard and brittle, if impact occurs during material withdrawal, the ceramic sheet 61 breaks (small part), and the cemented carbide can also play a certain role in protection.

The lower part of the ceramic sheet 61 is provided with a second mounting step, the base body is provided with a first mounting step at a side far away from the spiral blade 45, and the first mounting step and the second mounting step clamp each other to reduce the influence of centrifugal force on the shearing force of the adhesive.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (4)

1. A wear-resistant ceramic composite wear-resistant block for a decanter centrifuge, comprising:

a base for connection with the helical blade;

a cemented carbide piece connected to the substrate;

and the ceramic piece is respectively connected with the matrix and the hard alloy block.

2. The wear-resistant ceramic composite wear-resistant block for a decanter centrifuge according to claim 1, wherein the base body is provided with an installation clamping table on one side facing the spiral blade, and the base body is subjected to limit installation through the installation clamping table; the base body is provided with a first installation step at one side far away from the spiral blade, the width of the first installation step is smaller than the thickness of the hard alloy block, and silver brazing is adopted between the hard alloy block and the base body.

3. The wear-resistant ceramic composite wear-resistant block for a decanter centrifuge according to claim 2, wherein the bottom of the ceramic plate is provided with a second mounting step, the ceramic plate is bonded to the side face of the cemented carbide block, and the second mounting step is bonded to the bottom face of the cemented carbide block and the side face of the first mounting step, respectively.

4. A wear resistant ceramic composite wear resistant block for a decanter centrifuge according to any one of claims 1 to 3, wherein said substrate is a stainless steel substrate.