A multi-stage coal water slurry classifier and a method of classifying

Abstract

The application discloses a kind of water coal slurry multistage screeners and screening method, it is related to water coal slurry screening technical field, including hollow box, multiple screening cavities in the same vertical plane are equipped in hollow box, it is equipped with through cavity between adjacent two screening cavities, rectangular frame is inserted into screening cavity rotation, and the screen of multiple screening components is distributed from top to bottom and is composed of multistage screening structure, the connecting groove that is interconnected is opened in the four circumferential side walls of rectangular frame inner side, screen is arranged in the four circumferential side walls of rectangular frame inner side connecting groove, screen is spliced by multiple elastic rings distributed in matrix structure, screen can be transversely stretched in connecting groove and expand elastic ring internal space to prevent blockage and reset adjustment to ensure that elastic ring maintains normal screening space.The application is gradually reduced from top to bottom water coal slurry particle of screening granularity, realizes single screening different granularity water coal slurry component, changes the mode that traditional different granularity water coal slurry particle is screened multiple times, and improves screening efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water coal slurry screening, in particular to a multi-stage water coal slurry screen and a screening method. BACKGROUND

[0002] The reason for screening the water coal slurry is mainly to understand and master the composition ratio of particles of each particle size level in the water coal slurry, so as to better control the quality and application effect of the water coal slurry, and the screened water coal slurry can be used for different purposes. Since the particle size distribution range of the water coal slurry is very wide, it is necessary to select screens with different apertures for multiple screening, collect the screened samples after each screening, and measure the mass and volume of the samples, so as to obtain the density of the water coal slurry. The test screens with different apertures are screened to obtain the screening results of the water coal slurry under different particle sizes. According to the screening results, the particle size distribution, average particle size and specific surface area of the water coal slurry can be analyzed. Although the multiple screening method can measure the density of the water coal slurry, the operation mode of multiple screening affects the screening efficiency, thereby affecting the efficiency of measuring various parameters of the water coal slurry. Therefore, the present application provides a multi-stage water coal slurry screen and a screening method to solve the above problems. SUMMARY

[0003] The present application aims to provide a multi-stage water coal slurry screen and a screening method to solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a multi-stage water coal slurry screen, comprising:

[0005] A hollow box body is provided with an inlet at the upper end, and a hopper is arranged at the inlet opening. A plurality of screening chambers are arranged in the same vertical plane in the hollow box body, and one end of each screening chamber extends to one end of the side wall of the hollow box body. A through cavity is arranged between two adjacent screening chambers. An outlet is arranged at the bottom end of the hollow box body.

[0006] A plurality of screening assemblies are arranged in the hollow box body. Each screening assembly comprises a rectangular frame, a screening mesh and a sealing disc. The rectangular frame is rotatably inserted into the screening chamber. The screening meshes of the plurality of screening assemblies are arranged from top to bottom to form a multi-stage screening structure. The sealing disc is fixedly connected to one segment of the rectangular frame, and the end of the sealing disc is inserted into the inner wall of the opening of the screening chamber. Connection grooves are arranged in the four side walls of the rectangular frame. The screening mesh is arranged in the connection grooves of the four side walls of the rectangular frame.

[0007] The screening mesh is composed of a plurality of elastic rings arranged in a matrix structure. The internal space of the elastic ring of each screening mesh decreases proportionally from top to bottom. The screening mesh can be laterally stretched to expand the internal space of the elastic ring in the connection groove to prevent clogging and reset adjustment to ensure that the elastic ring maintains a normal screening space.

[0008] In further embodiments, the upper end surface of the rectangular frame is fixed with a rectangular hollow block, the inner walls of the rectangular hollow block are all inclinedly arranged towards the lower center of the rectangular frame, the left and right side edges of the upper end of the rectangular hollow block are rotationally attached to the inner side walls of the screening cavity, and the left and right side edges of the bottom wall of the rectangular frame are rotationally attached to the inner side walls of the screening cavity.

[0009] In further embodiments, the front and rear ends of the screening net are both fixed with connecting plates, one of the connecting plates is fixedly connected to the inner left and right connecting grooves of the rectangular frame, and the other connecting plate is slidingly connected to the inner left and right connecting grooves of the rectangular frame.

[0010] The side wall of the other connecting plate is fixedly connected to the rectangular column which is slidingly inserted into the connecting groove of the rectangular frame, the end of the rectangular column is provided with a T-shaped groove, a T-shaped rod is threadedly connected to the T-shaped groove, the end of the T-shaped rod is fixed with a rotating disc, the end of the rectangular frame away from the sealing disc is provided with an annular groove which is in communication with the connecting groove, and the rotating disc is rotationally connected to the annular groove.

[0011] In further embodiments, the side wall of the rotating disc is fixed with a rectangular block, the inner wall of the screening cavity is rotationally provided with a plug-in seat which is inserted into the rectangular block, and a torsional spring is arranged at the rotation position.

[0012] In further embodiments, the front and rear ends of the screening net are both fixed with T-shaped sliding blocks, the end of the T-shaped sliding block is slidingly sleeved with a buffer block, the ends of the two buffer blocks near the sealing disc are fixedly connected to the inner left and right connecting grooves of the rectangular frame, and the ends of the other two buffer blocks are slidingly connected to the inner left and right connecting grooves of the rectangular frame.

[0013] The buffer block away from the sealing disc is threadedly connected with a threaded rod, and one end of the threaded rod is rotationally connected to the side wall of the buffer block near the sealing disc.

[0014] In further embodiments, the inner upper and lower side walls of the left and right connecting grooves of the rectangular frame are both extended with guide grooves, and the upper and lower sides of the end of the buffer block are both extended with guide blocks which are slidingly connected to the guide grooves.

[0015] In further embodiments, the end of the rectangular frame away from the sealing disc is fixed with a rectangular block, the inner wall of the screening cavity is rotationally provided with a plug-in seat which is inserted into the rectangular block, and a torsional spring is arranged at the rotation position.

[0016] The other end of the threaded rod passes through the buffer block away from the sealing disc, and is fixed with a tooth column, the inner side wall of the screening cavity is fixed with a semicircular tooth disc which is located between the tooth column and the rectangular block and is engaged with the tooth column.

[0017] In further embodiments, the T-shaped sliders are provided in plurality and are equally divided into two groups, and the two groups of T-shaped sliders are arranged on the two side walls of the screening net on the left and right of the sealing disc, and the left and right buffer block ends close to the sealing disc are fixedly connected with the inner walls of the left and right connecting grooves in the rectangular frame respectively, and the left and right buffer block ends away from the sealing disc are slidingly connected with the inner walls of the left and right connecting grooves in the rectangular frame respectively, and the rest of the buffer blocks are provided with threaded holes for threaded connection with threaded rods.

[0018] In further embodiments, the bottom wall of the elastic ring of the screening net is provided with a plurality of pushing gaps, one end of the rectangular frame close to the sealing disc and the sealing disc are provided with pulling holes, the pulling holes are slidingly connected with pulling plates, one end of the pulling plates extends to below the screening net and is fixedly connected with a supporting plate, and a plurality of pushing teeth matched with the pushing gaps are fixedly connected to the supporting plate.

[0019] Preferably, based on the above-mentioned water coal slurry multi-stage screening method, the method comprises the following steps:

[0020] The plurality of screening nets are placed in the same vertical direction to form a multi-stage screening structure, the internal space of the elastic ring of the plurality of screening nets is proportionally decreased from top to bottom, and the water coal slurry particles with gradually decreasing screening particle sizes from top to bottom are screened to realize single-time screening of water coal slurry components with different particle sizes.

[0021] The screening net can be laterally stretched and expanded in the connecting groove to enlarge the internal space of the elastic ring, prevent blockage, reset and adjust, ensure that the elastic ring maintains normal screening space, and improve screening efficiency.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] The present application is a water coal slurry multi-stage screening device and a screening method, which comprises a plurality of screening nets placed in the same vertical direction to form a multi-stage screening structure, the internal space of the elastic ring of the plurality of screening nets is proportionally decreased from top to bottom, and the water coal slurry particles with gradually decreasing screening particle sizes from top to bottom are screened to realize single-time screening of water coal slurry components with different particle sizes. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of the present application;

[0025] Figure 2 It is a sectional view of the hollow box structure of the present application;

[0026] Figure 3Assemble structure of the rectangular frame, the socket, the rectangular block and the T-shaped rod of the present application is shown in the sectional view;

[0027] Figure 4 Assemble structure of the socket, the rectangular block and the T-shaped rod of the present application is shown in the schematic view;

[0028] Figure 5 The top view structure schematic diagram of the screen, the rectangular column and the connecting plate of the present application is shown in the top view structure schematic diagram;

[0029] Figure 6 And Figure 7 The structure schematic diagram of the sealing disc and the rectangular frame of the present application is shown in the structure schematic diagram;

[0030] Figure 8 The half sectional view of the rectangular hollow block of the present application is shown in the half sectional view;

[0031] Figure 9 The structure schematic diagram of the rectangular frame of the present application is shown in the structure schematic diagram;

[0032] Figure 10 The improved structure schematic diagram of the screen of the present application is shown in the improved structure schematic diagram;

[0033] Figure 11 The top view of the screen of the present application is shown in the top view;

[0034] Figure 12 The further improved top view of the screen of the present application is shown in the further improved top view;

[0035] Figure 13 The structure schematic diagram of the sealing disc, the rectangular frame and the pull plate of the present application is shown in the structure schematic diagram;

[0036] Figure 14 The local half sectional view of the screen of the present application is shown in the local half sectional view;

[0037] Figure 15 The assemble structure schematic diagram of the screen and the pushing tooth of the present application is shown in the assemble structure schematic diagram.

[0038] In the figure: 1, hollow box body; 2, sealing disc; 21, rectangular hollow block; 22, rectangular frame; 23, screen; 231, connecting plate; 232, rectangular column; 233, T-shaped rod; 234, rotating disc; 235, threaded rod; 2351, buffer block; 2352, T-shaped sliding block; 236, semicircular tooth disc; 237, tooth column; 238, pull plate; 239, supporting plate; 2310, pushing tooth; 3, socket; 31, rectangular block. DETAILED DESCRIPTION

[0039] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] In the embodiment, the water-coal slurry multi-stage screening device is provided. The water-coal slurry multi-stage screening device comprises a hollow box body 1, an inlet is formed at an upper end of the hollow box body 1, and a hopper is arranged at the inlet opening. The water-coal slurry to be screened is poured into the hollow box body 1 from the hopper for filtering operation, as shown in FIG. 1. Figure 1 The hollow box body 1 is internally provided with a plurality of screening cavities in the same vertical plane, and one end of the screening cavities extends to the side wall of one end of the hollow box body 1. The water-coal slurry multi-stage screening device further comprises a plurality of screening assemblies. The screening assembly comprises a rectangular frame 22, a screening mesh 23 and a sealing disc 2. The rectangular frame 22 is rotatably inserted into the screening cavity. The sealing disc 2 is fixedly connected to one section of the rectangular frame 22, and the end of the sealing disc 2 is inserted into the inner wall of the opening of the screening cavity. A through cavity is formed between two adjacent screening cavities. Connection grooves are formed in the inner side walls of the rectangular frame 22 and are in communication with each other, as shown in FIG. 2. The screening mesh 23 is arranged in the connection grooves on the four side walls of the rectangular frame 22. The screening meshes 23 of the plurality of screening assemblies are distributed from top to bottom to form a multi-stage screening structure. The screening mesh 23 is composed of a plurality of elastic rings arranged in a matrix structure. The internal space of the elastic rings of the plurality of screening meshes 23 is proportionally decreased from top to bottom, as shown in FIG. 3. Figure 9 Figure 2 、 Figure 6 、 Figure 7 ​As shown. A rectangular frame 22 is inserted into each screening chamber, the sealing disc 2 seals the column screening chamber opening, the screening net 23 is placed in the screening chamber, and each screening chamber is divided into two parts, the screening zone above the screening net 23, and the screening receiving zone below the screening net 23. The coal water slurry is screened from the uppermost screening net 23, and the larger particles of the coal water slurry are retained on the uppermost screening net 23. The smaller particles of the coal water slurry pass through the screening net 23 and fall into the next level of screening net 23 for further screening. After layer-by-layer screening, the coal water slurry components of different particle sizes are retained on the screening nets 23 of different levels. Then, the rectangular frame 22 is extracted from the screening chamber, and the coal water slurry components on the screening nets 23 of different levels can be taken out, realizing single screening of coal water slurry components of different particle sizes. The hollow box body 1 has an outlet at the bottom end, through which the coal water slurry waste liquid is discharged and drained into the sewer. The multi-stage screening structure is composed of multiple screening nets 23 placed in the same vertical direction. The internal space of the elastic ring of the multiple screening nets 23 decreases proportionally from top to bottom, and the screening particle size of the coal water slurry gradually decreases from top to bottom, realizing single screening of coal water slurry components of different particle sizes. This facilitates the analysis of parameters such as particle size distribution, average particle size, and specific surface area of the coal water slurry by the staff according to the screening results, changes the traditional method of screening coal water slurry particles of different particle sizes multiple times, and improves the screening efficiency.

[0041] In the screening process, in order to prevent the coal water slurry from leaking into the next level of screening net 23 through the gap between the rectangular frame 22 and the inner wall of the screening chamber without being screened by the screening net 23, and to prevent the coal water slurry from being screened multiple times to obtain coal water slurry components of different particle sizes, a rectangular hollow block 21 is fixed to the upper end of the rectangular frame 22, as shown. Figure 8 The left and right side edges of the upper end of the rectangular hollow block 21 are rotatably attached to the inner side wall of the screening chamber, and the left and right side edges of the bottom wall of the rectangular frame 22 are rotatably attached to the inner side wall of the screening chamber, ensuring that the coal water slurry in the screening zone must be screened by the screening net 23 before it can leak into the next level of screening net 23 for further screening operation, and that the coal water slurry components of different particle sizes are retained on the different layers of screening nets 23. Further, the inner side walls of the rectangular hollow block 21 are inclined downward toward the center of the rectangular frame 22, forming a receiving space for coal water slurry screening. The coal water slurry slides down the inclined side walls of the inner side of the rectangular hollow block 21 to the screening net 23, avoiding the retention of coal water slurry that cannot be completely screened.

[0042] Because the particle size of the coal water slurry is different, when multi-stage screening, the particles inevitably block the internal space of the elastic ring of the screening net 23, which affects the screening. (The elastic ring can be made of stainless steel or other materials that are not prone to rust and have good elasticity), therefore, the screening net 23 can be stretched horizontally in the connecting groove to expand the internal space of the elastic ring to prevent blockage and reset adjustment to ensure that the elastic ring maintains normal screening space and improves screening efficiency. The following will illustrate how the screening net 23 adjusts in the connecting groove through specific examples.

[0043] The first embodiment of the horizontal stretching and reset adjustment of the screening net 23 in the connecting groove: both ends of the screening net 23 are fixed with connecting plates 231, one connecting plate 231 near the sealing disc 2 is fixedly connected with the inner wall of the left and right connecting grooves in the rectangular frame 22, and the other connecting plate 231 is slidingly connected with the left and right connecting grooves in the rectangular frame 22, as shown in Figure 5 , one end of the screening net 23 is fixed in the connecting groove near the sealing disc 2 by using one of the connecting plates 231, and the other end of the screening net 23 is slidingly adjusted in the connecting groove away from the sealing disc 2 by using the other connecting plate 231. The connecting groove of the rectangular frame 22 has a large enough space to meet the stretching or reset adjustment requirements of the screening net 23 in the connecting groove.

[0044] Then, once the elastic ring of the screening net 23 is blocked, the clogged screening net 23 needs to be dredged. A rectangular column 232 slidingly connected with the connecting groove away from the sealing disc 2 in the rectangular frame 22 is fixed in the middle of the side wall of one connecting plate 231 away from the sealing disc 2, a T-shaped slot is formed at the end of the rectangular column 232, a T-shaped rod 233 is threadedly connected in the T-shaped slot, a rotating disc 234 is fixed at the end of the T-shaped rod 233 extending out of the T-shaped slot, an annular groove is formed in one end of the rectangular frame 22 away from the sealing disc 2 and connected with the connecting groove, the rotating disc 234 is rotatably connected with the annular groove, a rectangular block 31 is fixed on the side wall of the rotating disc 234, a plug-in seat 3 is rotatably arranged on the inner wall of the screening chamber and plugged with the rectangular block 31, and a torsional spring is arranged at the rotating position. As shown in Figure 3 and Figure 4As shown, during screening, the rectangular frame 22 is inserted into the screening chamber, and the rectangular block 31 is inserted into the socket 3 in the screening chamber. Since the socket 3 is provided with a torsion spring at the joint with the screening chamber, the rectangular frame 22 and the screening net 23 remain in a horizontal state without external force rotating the sealing disc 2 and the rectangular frame 22, so as to realize normal screening operation. After the clogging occurs during the screening process, the sealing disc 2 is rotated, which drives the sealing disc 2, the rectangular frame 22 and the screening net 23 to rotate clockwise in the screening chamber. The torsion spring generates a reverse potential energy, and the rectangular column 232 rotates synchronously with the rectangular frame 22. The rectangular column 232 slides and adjusts along the axial direction of the T-shaped rod 233 away from the sealing disc 2. During the sliding, the screening net 23 is horizontally slid and stretched in the connecting groove of the rectangular frame 22, the internal space of the elastic ring is expanded, the screening space is enlarged, the coal water slurry particles clogged in the elastic ring fall down, and the unblocking operation is realized.

[0045] After the unblocking is completed, the rotating rectangular frame 22 is loosened, the torsion potential energy of the torsion spring drives the rectangular block 31 to rotate reversely through the socket 3, the T-shaped rod 233 reversely adjusts along the internal rectangular column 232, the screening net 23 is reset and adjusted, the internal space of the elastic ring returns to the initial state, and the screening operation is continuously performed. The T-shaped rod 233 is limited in the annular groove and cannot adjust the position along the axial direction. Therefore, as long as the T-shaped rod 233 rotates, the rectangular column 232 can be driven to adjust the position along the axial direction of the T-shaped rod 233, so as to realize the stretching and reset adjustment of the screening net 23.

[0046] The second embodiment that the screening net 23 can be transversely stretched and reset adjusted in the connecting groove: the T-shaped sliding blocks 2352 are fixed at the front and rear ends of the screening net 23, the buffer blocks 2351 are slidably sleeved on the outer walls of the ends of the T-shaped sliding blocks 2352, the ends of the two buffer blocks 2351 close to the sealing disc 2 are fixedly connected with the inner walls of the left and right connecting grooves in the rectangular frame 22, and the ends of the other two buffer blocks 2351 are slidably connected with the inner walls of the left and right connecting grooves in the rectangular frame 22. Figure 10 and Figure 11 As shown, one end of the screening net 23 is fixed in the connecting groove close to the sealing disc 2 by using the two T-shaped sliding blocks 2352 and the buffer blocks 2351 slidably sleeved on the T-shaped sliding blocks 2352, and the other end of the screening net 23 is slidably adjusted in the connecting groove away from the sealing disc 2 by using the two T-shaped sliding blocks 2352 and the buffer blocks 2351 slidably sleeved on the T-shaped sliding blocks 2352. There is a large enough space in the connecting groove of the rectangular frame 22 to meet the stretching or reset adjustment requirement of the screening net 23 in the connecting groove.

[0047] Therefore, once the elastic ring of the screening net 23 is blocked, the clogged screening net 23 needs to be dredged. A threaded rod 235 is threadedly connected to the buffer block 2351 away from the sealing disc 2. One end of the threaded rod 235 is rotatably connected to the side wall of the buffer block 2351 close to the sealing disc 2. A rectangular block 31 is fixed to one end of the rectangular frame 22 away from the sealing disc 2. A plug-in seat 3 is rotatably arranged on the inner wall of the screening chamber and is plugged with the rectangular block 31. A torsional spring is arranged at the rotation position. During screening, the rectangular frame 22 is inserted into the screening chamber, and the rectangular block 31 is inserted into the plug-in seat 3 in the screening chamber. Since the plug-in seat 3 is provided with the torsional spring at the connection position with the screening chamber, the torque of the torsional spring is used to keep the rectangular frame 22 and the screening net 23 in a horizontal state without external force rotating the sealing disc 2 and the rectangular frame 22, so as to realize normal screening operation. The other end of the threaded rod 235 penetrates through the buffer block 2351 away from the sealing disc 2 and is fixed with a tooth column 237. A semicircular tooth disc 236 is fixed to the inner side wall of the screening chamber and is located between the tooth column 237 and the rectangular block 31 and is engaged with the tooth column 237. Once the blocking occurs during the screening process, the sealing disc 2 is only rotated to drive the sealing disc 2, the rectangular frame 22 and the screening net 23 to rotate clockwise in the screening chamber. The torsional spring generates a reverse potential energy. While the rectangular frame 22 rotates, the tooth column 237 at the end of the threaded rod 235 rotates along the outer wall of the semicircular tooth disc 236 on the side, so that the threaded rod 235 rotates synchronously. Since the threaded rod 235 is threadedly connected to the buffer block 2351 away from the sealing disc 2, the threaded rod 235 rotates to drive the buffer block 2351 away from the sealing disc 2 to adjust to the side away from the sealing disc 2 along the axial direction of the threaded rod 235, so as to drive the screening net 23 to stretch to the side away from the sealing disc 2 along the connecting groove, expand the internal space of the elastic ring, and increase the screening space, so that the coal water slurry particles blocked in the elastic ring fall down to realize the dredging operation.

[0048] After the dredging is completed, the rotating rectangular frame 22 is loosened, the reverse rotation of the rectangular block 31 is driven by the torsional potential energy of the torsional spring through the plug-in seat 3, the tooth column 237 reversely rotates along the outer wall of the semicircular tooth disc 236, the threaded rod 235 reversely rotates, the buffer block 2351 away from the sealing disc 2 is adjusted to the side close to the sealing disc 2 along the axial direction of the threaded rod 235, so as to drive the screening net 23 to reset and adjust to the side close to the sealing disc 2 along the connecting groove, reduce the internal space of the elastic ring, restore the initial state of the internal space of the elastic ring, and continue the screening operation.

[0049] In addition, in order to prevent the buffer block 2351 from sliding out of the connecting groove when sliding along the connecting groove, guide grooves are extended on the upper and lower side walls of the connecting grooves on the left and right sides of the rectangular frame 22. Guide blocks are extended on the upper and lower sides of the end of the buffer block 2351 and are slidably connected with the guide grooves. The buffer block 2351 slides along the guide grooves by the guide blocks to ensure the stable sliding of the buffer block 2351 along the connecting groove.

[0050] The third embodiment of the transverse stretching and resetting adjustment of the screening net 23 in the connecting groove: different from the second embodiment, the T-shaped slider 2352 is provided with multiple sliders, which are divided into two groups. The two groups of T-shaped sliders 2352 are arranged on the two side walls of the screening net 23, respectively. The left and right buffer blocks 2351 close to the sealing disc 2 are fixedly connected with the inner walls of the left and right connecting grooves in the rectangular frame 22, respectively. The left and right buffer blocks 2351 away from the sealing disc 2 are slidingly connected with the inner walls of the left and right connecting grooves in the rectangular frame 22, respectively. The remaining buffer blocks 2351 are provided with threaded holes for threaded connection with the threaded rods 235. As shown in FIG. Figure 12 In this way, as long as the threaded rods 235 are rotated, all the buffer blocks 2351 will be adjusted in the axial direction of the threaded rods 235 except for the fixed buffer blocks 2351 in the connecting groove, ensuring that the elastic rings of the screening net 23 are uniformly stretched and operated, expanding the internal space of the elastic rings, ensuring that the internal space of each elastic ring is expanded, and improving the dredging efficiency. Reverse rotation of the threaded rods 235 can reversely adjust the buffer blocks 2351, so that the elastic rings of the screening net 23 are reset to the initial state, and the screening operation continues.

[0051] The fourth embodiment of the transverse stretching and resetting adjustment of the screening net 23 in the connecting groove: the bottom wall of the elastic ring of the screening net 23 is provided with multiple pushing gaps. One end of the rectangular frame 22 close to the sealing disc 2 and the sealing disc 2 are provided with pulling holes. The pulling plate 238 is slidingly inserted into the pulling hole. One end of the pulling plate 238 extends below the screening net 23 and is fixed with the supporting plate 239. The supporting plate 239 is fixed with multiple pushing teeth 2310 matched with the pushing gaps. As shown in FIG. Figure 13 , Figure 14 and Figure 15 When dredging the clogged screening net 23, as long as the pulling plate 238 is pushed along the pulling hole, the multiple pushing teeth 2310 on the supporting plate 239 can be pushed from one end of the screening net 23 to the other end of the screening net 23. During this process, the pushing teeth 2310 pass through the inside of the pushing gap of each elastic ring, and the water coal slurry components clogged in the elastic ring are dredged, so that the water coal slurry particles clogged in the elastic ring fall down, realizing the dredging operation. This embodiment can be applied to the first, second and third embodiments respectively, in addition to being used independently, to improve the dredging efficiency.

[0052] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-stage coal water slurry classifier characterized by, Include: Hollow box (1), the upper end of the hollow box (1) is provided with an inlet, and the inlet opening is provided with a hopper, a plurality of screening cavities in the same vertical plane are arranged in the hollow box (1), and the screening cavities extend to one end of the side wall of the hollow box (1) at one end, a through cavity is arranged between adjacent two screening cavities, and an outlet is arranged at the bottom end of the hollow box (1); A plurality of screening assemblies, the screening assembly includes a rectangular frame (22), a screening net (23) and a sealing disc (2), the rectangular frame (22) is rotatably inserted into the screening cavity, the screening nets (23) of the plurality of screening assemblies are distributed from top to bottom to form a multi-stage screening structure, the sealing disc (2) is fixedly connected with one of the rectangular frames (22), and the end of the sealing disc (2) is inserted into the inner wall of the opening of the screening cavity, a connecting groove is formed in the four side walls of the inner side of the rectangular frame (22), and the screening net (23) is arranged in the connecting groove of the four side walls of the rectangular frame (22); The screening net (23) is composed of a plurality of elastic rings arranged in a matrix structure, the internal space of the elastic rings of the plurality of screening nets (23) decreases proportionally from top to bottom, and the screening net (23) can be laterally stretched to expand the internal space of the elastic ring in the connecting groove to prevent clogging and reset adjustment to ensure that the elastic ring maintains normal screening space; T-shaped sliding blocks (2352) are fixedly arranged on the front and rear ends of the screening net (23), a buffer block (2351) is slidably connected to the outer wall of the end of the T-shaped sliding block (2352), the ends of the two buffer blocks (2351) close to the sealing disc (2) are fixedly connected with the inner walls of the left and right connecting grooves in the rectangular frame (22), and the ends of the other two buffer blocks (2351) are slidably connected with the inner walls of the left and right connecting grooves in the rectangular frame (22); The buffer block (2351) away from the sealing disc (2) is threadedly connected with a threaded rod (235), one end of the threaded rod (235) is rotatably connected with the side wall of the buffer block (2351) close to the sealing disc (2).

2. The multi-stage coal water slurry classifier of claim 1, wherein: A rectangular hollow stop block (21) is fixedly arranged on the upper end surface of the rectangular frame (22), the inner side walls of the rectangular hollow stop block (21) are inclined downward to the center of the rectangular frame (22), the left and right side edges of the upper end of the rectangular hollow stop block (21) are rotatably attached to the inner side walls of the screening cavity, and the left and right side edges of the bottom wall of the rectangular frame (22) are rotatably attached to the inner side walls of the screening cavity.

3. The multi-stage coal water slurry classifier of claim 1, wherein: The upper and lower side walls of the left and right connecting grooves in the rectangular frame (22) are extended with guide grooves, and the ends of the buffer blocks (2351) are extended with guide blocks which are slidably connected with the guide grooves.

4. The multi-stage coal water slurry classifier of claim 1, wherein: A rectangular block (31) is fixedly arranged at one end of the rectangular frame (22) away from the sealing disc (2), an insertion seat (3) is rotatably arranged on the inner wall of the screening cavity and is inserted with the rectangular block (31), and a torsional spring is arranged at the rotation position; The other end of the threaded rod (235) penetrates through the buffer block (2351) away from the sealing disc (2), and a tooth column (237) is fixedly arranged on the other end of the threaded rod (235), and a semicircular tooth disc (236) is fixedly arranged on the inner side wall of the screening cavity and is engaged with the tooth column (237).

5. The multi-stage coal water slurry classifier of claim 1, wherein: The T-shaped sliders (2352) are provided in multiple numbers and are equally divided into two groups, and the two groups of T-shaped sliders (2352) are arranged on the two side walls of the screening net (23) near the left and right buffer blocks (2351) of the sealing disc (2), and the left and right buffer blocks (2351) ends away from the sealing disc (2) are respectively fixedly connected with the inner walls of the left and right connecting grooves in the rectangular frame (22), and the left and right buffer blocks (2351) ends away from the sealing disc (2) are respectively slidably connected with the inner walls of the left and right connecting grooves in the rectangular frame (22), and the remaining buffer blocks (2351) are provided with threaded holes for threadedly connecting with the threaded rods (235).

6. The multi-stage classifier for coal water slurry according to any one of claims 1 to 5, characterized in that: The bottom wall of the elastic ring of the screening net (23) is provided with a plurality of pushing gaps, one end of the rectangular frame (22) near the sealing disc (2) and the sealing disc (2) are provided with pull-out holes, the pull-out holes are slidably connected with pull-out plates (238), one end of the pull-out plates (238) extends below the screening net (23) and is fixedly connected with a supporting plate (239), and the supporting plate (239) is fixedly connected with a plurality of pushing teeth (2310) matched with the pushing gaps.

7. A screening method of a multi-stage coal water slurry screen, using the multi-stage coal water slurry screen according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: The multiple screening nets (23) are placed in the same vertical direction to form a multi-stage screening structure, the internal space of the elastic ring of the multiple screening nets (23) is proportionally decreased from top to bottom, and the water coal slurry particles with gradually decreasing particle sizes from top to bottom are screened, so that the water coal slurry components with different particle sizes are screened at one time; The screening net (23) can be laterally stretched and expanded in the connecting groove to prevent blockage and reset adjustment, so that the elastic ring can maintain normal screening space and improve screening efficiency.

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