Coal floating and sinking test device and use method thereof

Abstract

The invention relates to the technical field of coal sorting and processing, and discloses a coal floating and sinking test device and a using method thereof.The coal floating and sinking test device comprises a base and a bearing table arranged over the base, a center shaft is rotationally installed on the base, and the upper end of the center shaft is fixedly connected with the middle of the lower surface of the bearing table; the base is provided with a driving device used for driving the center shaft to rotate, the heavy liquid barrels are filled with heavy liquid and arranged on the bearing table at equal intervals, and containing grooves allowing the heavy liquid barrels to be embedded in are formed in the corresponding positions of the bearing table. The technical means that the floating and sinking assembly is matched with the net bottom barrel is adopted, the bearing table rotates to drive the guide rod to move in a reciprocating mode, the whole process that the net bottom barrel is transferred to a high-density heavy liquid barrel from a low-density heavy liquid barrel step by step is completed, the defects in the prior art are overcome, and the whole device is simple and durable in structure, long in service life and low in maintenance cost.

Description

Technical Field

[0001] The present invention relates to the technical field of coal sorting and processing, and more specifically, to a coal floating and sinking test device and a use method thereof. Background Art

[0002] In the field of coal washing engineering, coal floating and sinking test is a more conventional processing method, which mainly uses heavy liquids with different densities to separate the test samples into materials of various densities. The floating and sinking test can be used to understand the density composition of raw coal, clean coal, medium coal, gangue, etc. It is used to analyze the selectivity of raw coal and the distribution law of various density materials in the sorting products. This test method has strong practicality.

[0003] The traditional floating and sinking test usually involves washing the coal slime attached to the test coal sample with water first, filtering out the washing water, and then passing the coal sample through pre-configured heavy liquid barrels with different densities in turn. The floating objects are then picked up from the low-density heavy liquid barrel and placed into the next high-density heavy liquid barrel for floating and sinking until all the coal samples have been tested. Finally, the products of each density level and the coal slime are dried and weighed separately.

[0004] With the development of science and technology, the test process has been basically automated. For example, the patent with patent number "CN117505043A" discloses "a fully automatic coal floating and sinking test equipment, including a floating and sinking test device, a coal scooping device, a heavy liquid recovery device, a liquid preparation bucket and a floating object collection device..." This patent uses automation instead of manual labor to achieve the rapid and accurate preparation of heavy liquid of any density level.

[0005] Although the above-mentioned prior art can use automated equipment instead of manual labor when conducting coal floating and sinking tests, in actual operation, since some tests use highly corrosive zinc chloride liquid as heavy liquid, and most of the existing automated equipment are precision instruments that are easily corroded, which affects their service life and has a high overall maintenance cost. Summary of the invention

[0006] The invention provides a coal floating and sinking test device, which solves the technical problems that the existing coal floating and sinking test automation equipment in the related art is easy to be corroded and has high maintenance cost.

[0007] The present invention provides a coal floating and sinking test device, comprising: a base and a bearing platform arranged directly above the base, a central shaft is rotatably mounted on the base, the upper end of the central shaft is fixedly connected to the middle of the lower surface of the bearing platform, a driving device for driving the central shaft to rotate is arranged on the base, and further comprising: A plurality of heavy liquid barrels filled with heavy liquid are arranged at equal intervals on the carrying platform, corresponding positions on the carrying platform are provided with receiving grooves for the heavy liquid barrels to be embedded, the outer peripheral wall of the carrying platform is provided with regularly undulating guide grooves, and a net bottom bucket is arranged above the carrying platform; The floating and sinking assembly is arranged on the base and cooperates with the guide groove in transmission. When the supporting platform rotates along the set direction, the guide groove drives the floating and sinking assembly to operate, and the floating and sinking assembly drives the net bottom bucket to reciprocate in the vertical direction.

[0008] Preferably, the floating and sinking assembly includes a sleeve fixedly mounted on the upper side of the base, a vertical plate is slidably connected inside the sleeve, a guide rod is fixedly connected to a plate body on one side of the vertical plate close to the supporting platform, the guide rod slides in cooperation with the guide groove, and when the base rotates, the guide groove drives the guide rod to reciprocate along the length direction of the vertical plate, a limiting groove is provided on the sleeve for the guide rod to move up and down, the vertical plate is fixedly connected to a support frame on the plate body extending outside the sleeve, and an embedding groove matching the shape of the net bottom barrel is provided on the side of the support frame close to the supporting platform.

[0009] Preferably, the base is also provided with a flotation assembly for scooping up the scum floating in the net bottom bucket; The flotation assembly comprises a mounting plate fixedly mounted on the base, and the mounting plate is arranged opposite to the vertical plate, a lower slide rail is fixedly mounted on one side of the mounting plate close to the base, an upper slide rail is slidably connected to the lower slide rail, a vertical rod is slidably arranged on the upper slide rail, a connecting frame is fixedly mounted on the lower end of the vertical rod, a conical bailing pipe is fixedly mounted on the lower side of the connecting frame, the inner bottom of the conical bailing pipe has a conical tubular convex portion, a hollow floating block matching its shape is slidably connected to the center of the convex portion, and a plurality of water leakage holes are opened on the convex portion; The upper slide rail is provided with a transmission assembly, which cooperates with the vertical plate in transmission, and when the vertical plate reciprocates, the transmission assembly drives the vertical rod to move in the opposite direction to the vertical plate.

[0010] Preferably, a metal filter mesh matching the shape of the inner wall of the conical bailing tube is detachably connected to the inside of the conical bailing tube.

[0011] Preferably, the transmission assembly includes a push plate fixedly mounted on the top of the vertical plate, a support plate fixedly mounted on the upper surface of the upper slide rail, a rotating plate rotatably connected to the upper side of the support plate, a mounting block fixedly connected to the upper end of the vertical rod, push rods fixedly connected on both sides of the mounting block, each of the push rods is slidably connected to the rotating plate, a sliding groove for the push rod to be embedded and slide is provided at a corresponding position on the rotating plate, a compression spring is sleeved on the vertical rod, and the spring is located between the upper slide rail and the mounting block.

[0012] Preferably, the guide groove is provided with a plurality of equidistantly arranged sawtooth grooves.

[0013] Preferably, at least one stabilizing rod is fixedly mounted on the upper side of the connecting frame, the stabilizing rod is slidably connected to the upper slide rail, a positioning bolt is threadedly connected to the upper slide rail, and a positioning groove for the bolt to be embedded is provided on the lower slide rail.

[0014] Preferably, the driving device is configured as a servo motor, the output shaft of the servo motor is fixedly connected to the central shaft, an electric control box is installed on the side of the sleeve away from the supporting platform, and the electric control box is connected to the servo motor signal.

[0015] Preferably, a plurality of auxiliary plates are equidistantly mounted on the upper surface of the base, and each of the auxiliary plates is slidably matched with the lower surface of the supporting platform.

[0016] Preferably, the method of using the method comprises the following steps: S1: First, pour the heavy liquids of corresponding density into multiple heavy liquid barrels one by one in the order of density from small to large. In the initial state, the heavy liquid barrel corresponding to the heavy liquid with the lowest density is located directly below the floating and sinking assembly. At this time, the net bottom barrel containing the processed coal sample is placed in the embedded groove on the support frame. During this process, the lower end of the net bottom barrel gradually sinks into the heavy liquid below, and the heavy liquid penetrates into the net bottom barrel through the mesh holes of the screen on the lower side of the net bottom barrel, submerging the coal sample; S2: Then, the driving device is started, which drives the central axis to rotate, and then drives the bearing platform to reciprocate within a small angle. At this time, the guide groove repeatedly pushes the guide rod, and then drives the vertical plate and the sleeve to slide relative to each other. The vertical plate is restricted by the sleeve in terms of its movement trajectory, and can only move up and down in a small range in the vertical direction, and then drives the support frame and the net bottom bucket thereon to move up and down synchronously. In this way, the coal sample in the bucket is shaken to gradually loosen it and make it contact with the heavy liquid more fully. After shaking for one to two minutes, the net bottom bucket is reset and left to stand for two minutes until the scum floats out. S3: When it is necessary to scoop out the scum in the net bottom bucket, first push the upper slide rail in the direction close to the net bottom bucket, so that the scooping assembly moves as a whole to the top of the net bottom bucket. At this time, the vertical plate is driven by the driving device to move upward by a set distance, and the vertical plate drives the net bottom bucket to move upward synchronously, so that the scum originally adhered to the edge of the inner wall of the net bottom bucket is separated. During the upward movement of the vertical plate, the conical scooping tube is driven downward by the transmission assembly. During its downward movement, the hollow floating block first contacts the liquid surface. Under the action of buoyancy, the floating block moves upward relative to the conical scooping tube and blocks its bottom. When the conical scooping tube is completely immersed in the heavy liquid, the height difference between the liquid surface and the conical scooping tube can be used to suck the scum together with part of the heavy liquid into the conical scooping tube. On the contrary, when the conical scooping tube moves upward, the hollow floating block is away from the conical scooping tube under the action of gravity, so that the liquid accumulated in the tube can be smoothly drained out along the leakage hole. After draining, the upper slide rail is pushed back.

[0017] S4: Subsequently, the driving device drives the carrier platform to continue rotating, so that the next heavy liquid barrel with higher density moves toward the direction close to the net bottom barrel. In the process of transferring the net bottom barrel and the coal sample therein from the low-density heavy liquid barrel to the high-density heavy liquid barrel, the guide rod and the guide groove slide relative to each other, first moving from the lowest point of the concave part of the guide groove to the highest point of the convex part. In the process of moving the net bottom barrel to the upper side of the liquid surface of the heavy liquid barrel, the guide rod slides relative to the serrated groove. Since the surface of the serrated groove is uneven, the guide rod will bump when passing through, which indirectly drives the moving net bottom barrel to shake, so that the coal sample at the bottom of the net bottom barrel becomes loose due to the shaking, which accelerates the drainage of the liquid in the barrel and shortens the time spent on this step. S5: After the bottom of the net bottom bucket is completely separated from the heavy liquid, stop rotating and let the net bottom bucket stand for two to three minutes. At this time, the net bottom bucket moves to a position close to the edge of the heavy liquid bucket with the lowest density, but still above it. After shaking, the heavy liquid drained out of the net bottom bucket can quickly flow back into the heavy liquid bucket. After it is fully drained, continue to rotate the support platform so that the guide rod passes the highest point of the convex part of the guide groove and moves to the lowest point of the concave part. With the rotation of the support platform, the net bottom bucket can be smoothly sent into the next heavy liquid bucket with higher density without the need for personnel to touch the net bottom bucket. This cycle can be repeated to complete the entire test operation.

[0018] The beneficial effects of the present invention are: The present invention adopts the technical means of cooperating with the floating and sinking components and the net bottom bucket. The guide rod is driven to move back and forth by the rotation of the bearing platform, and then the net bottom bucket is driven to move back and forth in the vertical direction. In conjunction with the rotating bearing platform, the entire process of transferring the net bottom bucket from a low-density heavy liquid bucket to a high-density heavy liquid bucket step by step is completed without the need for the cooperation of sophisticated automated equipment, thereby overcoming the shortcomings of the prior art. The entire device has a simple and durable structure, a long service life, and a low maintenance cost.

[0019] The present invention adopts technical means of cooperating with a serrated groove and a guide rod. In the process of moving the mesh bottom bucket to the upper side of the liquid surface of the heavy liquid bucket, the uneven characteristics of the serrated groove are utilized to drive the moving mesh bottom bucket to shake, so that the coal sample at the bottom of the mesh bottom bucket becomes loose, thereby accelerating the drainage of the liquid in the bucket, shortening the time spent on this step, and thereby improving work efficiency.

[0020] The present invention adopts the technical means of cooperating the floating and sinking components and the scooping components. The vertical plate moves upward to drive the conical scooping tube to move downward. During the downward movement, the hollow floating block first contacts the liquid surface. Under the action of buoyancy, the floating block moves upward relative to the conical scooping tube to seal the bottom thereof, so that when the conical scooping tube is completely immersed in the heavy liquid, the height difference between the liquid surface and the conical scooping tube can be utilized to suck the scum together with part of the heavy liquid into the conical scooping tube. On the contrary, when the conical scooping tube moves upward, the hollow floating block moves away from the conical scooping tube under the action of gravity, so that the liquid accumulated in the tube can be drained smoothly, and the scum can be automatically and stably scooped, thereby further improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram for displaying the base and the driving device of the present invention; Figure 3 It is a three-dimensional structural schematic diagram for displaying the bearing platform and the guide groove of the present invention; Figure 4 It is a three-dimensional structural schematic diagram for displaying the floating and sinking components of the present invention; Figure 5 It is a three-dimensional structural schematic diagram for displaying the flotation assembly of the present invention; Figure 6 It is a three-dimensional structural schematic diagram for displaying the transmission assembly of the present invention; Figure 7 It is an exploded view of the present invention for showing a conical fishing pipe and a metal filter frame; Figure 8 It is a three-dimensional structural schematic diagram for displaying the upper slide rail and the lower slide rail of the present invention; Fig. 9 This is a schematic diagram of the three-dimensional structure of the present invention for displaying the net bottom bucket in the transfer state; Fig.10 It is a schematic diagram of the three-dimensional structure of the present invention for showing the conical fishing pipe in a floating state.

[0022] In the figure: 100, base; 200, bearing platform; 300, floating and sinking assembly; 400, scooping assembly; Central axis; 102, servo motor; 103, electric control box; 104, auxiliary board; Heavy liquid barrel; 202, guide groove; 203, net bottom barrel; 204, sawtooth groove; Casing; 302, vertical plate; 303, guide rod; 304, support frame; Mounting plate; 402, lower slide rail; 403, upper slide rail; 404, vertical rod; 405, connecting frame; 406, conical fishing pipe; 407, hollow floating block; 408, transmission assembly; 409, metal filter; Push plate; 4082, support plate; 4083, rotating plate; 4084, mounting block; 4085, push rod; 4086, compression spring; 4087, stabilizer bar; 4088, positioning bolt. DETAILED DESCRIPTION

[0023] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the present specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0024] like Figure 1 - Fig.10 As shown, the present embodiment provides a coal floating and sinking test device, comprising: a base 100 and a bearing platform 200 arranged directly above the base 100, a central shaft 101 is rotatably mounted on the base 100, an upper end of the central shaft 101 is fixedly connected to the middle of the lower surface of the bearing platform 200, a driving device for driving the central shaft 101 to rotate is arranged on the base 100, and also comprises a plurality of heavy liquid barrels 201 filled with heavy liquid, which are equidistantly arranged on the bearing platform 200, corresponding positions on the bearing platform 200 are provided with receiving grooves for the heavy liquid barrels 201 to be embedded, a guide groove 202 with regular undulations is provided on the outer peripheral wall of the bearing platform 200, a net bottom bucket 203 is arranged above the bearing platform 200, a floating and sinking component 300 is arranged on the base 100, and it is matched with the guide groove 202 in transmission, when the bearing platform 200 rotates along the set direction, the guide groove 202 drives the floating and sinking component 300 to operate, and the floating and sinking component 300 drives the net bottom bucket 203 to reciprocate in the vertical direction.

[0025] The working principle and beneficial effects of the above technical solution are: First, heavy liquids of corresponding density are poured into multiple heavy liquid barrels 201 one by one in order from small to large. In the initial state, the heavy liquid barrel 201 corresponding to the heavy liquid with the lowest density is located directly below the floating and sinking assembly 300. At this time, the mesh bottom barrel 203 containing the processed coal sample is placed in the embedded groove on the support frame 304. During this process, the lower end of the mesh bottom barrel 203 gradually sinks into the heavy liquid below, and the heavy liquid penetrates into the mesh bottom barrel 203 through the mesh holes of the screen on the lower side of the mesh bottom barrel 203, submerging the coal sample.

[0026] At this time, the driving device is started, which drives the central axis 101 to rotate, and then drives the supporting platform 200 to reciprocate within a smaller angle. At this time, the guide groove 202 drives the floating and sinking assembly 300 to operate, and then drives the net bottom bucket 203 to move up and down in a small range in the vertical direction. In this way, the coal sample in the bucket is shaken to gradually loosen it and make it contact with the heavy liquid more fully.

[0027] After shaking for one to two minutes, the driving device drives the net bottom bucket 203 to reset, and it is left to stand for two minutes. Then, the scum floating on the liquid surface is fished out, and the controllable driving device drives the carrier 200 to rotate, so that the next heavy liquid bucket 201 with higher density moves closer to the net bottom bucket 203. In this process, the floating and sinking component first drives the net bottom bucket 203 to move upward, and moves it out of the original heavy liquid bucket 201 with lower density. After the bottom of the net bottom bucket 203 is completely separated from the heavy liquid, the rotation is stopped, and the net bottom bucket 203 is left to stand for two to three minutes. At this time, the net bottom bucket 203 moves to the direction close to the dense The position of the edge of the heavy liquid barrel 201 with the lowest density, but still above it, the heavy liquid drained out of the mesh bottom barrel 203 can flow back into the heavy liquid barrel 201. After it is fully drained, the supporting platform 200 continues to rotate, and after the mesh bottom barrel 203 moves to the set highest point, it moves downward, so that the mesh bottom barrel 203 can smoothly enter the next heavy liquid barrel 201 with higher density. This cycle can be repeated to complete the entire test operation, and after the mesh bottom barrel 203 is moved out of the heavy liquid barrel 201 with the highest density, the adjacent one is the heavy liquid barrel 201 with the lowest density, ready for the next test.

[0028] In a specific embodiment: the floating and sinking component 300 includes a sleeve 301 fixedly installed on the upper side of the base 100, and a vertical plate 302 is slidably connected in the sleeve 301. A guide rod 303 is fixedly connected to the plate body of the vertical plate 302 close to the supporting platform 200. The guide rod 303 slides with the guide groove 202, and when the supporting platform 200 rotates, the guide groove 202 drives the guide rod 303 to reciprocate along the length direction of the vertical plate 302. A limiting groove for the guide rod 303 to move up and down is provided on the sleeve 301. The vertical plate 302 extends on the plate body outside the sleeve 301 and is fixedly connected to a support frame 304. The support frame 304 is provided with an embedding groove that matches the shape of the net bottom bucket 203 on the side close to the supporting platform 200.

[0029] The working principle and beneficial effects of the above technical solution are: Start the driving device, which drives the central axis 101 to rotate, and then drives the supporting platform 200 to reciprocate within a smaller angle. At this time, the guide groove 202 repeatedly pushes the guide rod 303, and then drives the vertical plate 302 and the sleeve 301 to slide relative to each other. The vertical plate 302 is restricted by the sleeve 301 in its movement trajectory, and can only move up and down in a small range in the vertical direction, thereby driving the support frame 304 and the net bottom bucket 203 thereon to move up and down synchronously. In this way, the coal sample in the bucket is shaken to gradually loosen it and make it contact with the heavy liquid more fully.

[0030] After shaking for one to two minutes, the driving device drives the net bottom bucket 203 to reset, let it stand for two minutes, then remove the scum floating on the liquid surface, and the controllable driving device drives the supporting platform 200 to rotate, so that the guide rod 303 and the guide groove 202 slide relative to each other, and the guide rod 303 first moves from the lowest point of the concave part of the guide groove 202 to the highest point of the convex part. At this time, the guide rod 303 gradually rises, thereby driving the net bottom bucket 203 to gradually move upward. After the bottom of the net bottom bucket 203 is completely separated from the heavy liquid, the movement is stopped and the net bottom bucket 203 is left to stand for two to three minutes. At this time, the net bottom bucket 203 moves to a position close to the edge of the heavy liquid bucket 201 with the lowest density, but still above it, and the heavy liquid drained from the net bottom bucket 203 can flow back into the heavy liquid bucket 201.

[0031] After sufficient drainage, continue to rotate the supporting platform 200 so that the guide rod 303 passes over the highest point of the convex part of the guide groove 202, and after a smooth position transition, moves to the lowest point of the concave part, and cooperates with the rotation of the supporting platform 200 to smoothly send the net bottom bucket 203 into the next heavy liquid bucket 201 with higher density. This cycle is repeated to complete the entire test operation, and after the net bottom bucket 203 is moved out of the heavy liquid bucket 201 with the highest density, the adjacent one is the heavy liquid bucket 201 with the lowest density, preparing for the next test.

[0032] In a specific embodiment, the base 100 is also provided with a flotation assembly 400 for scooping the scum floating in the net bottom bucket 203. The flotation assembly 400 includes a mounting plate 401 fixedly mounted on the base 100 and arranged opposite to the vertical plate 302. A lower slide rail 402 is fixedly mounted on the side of the mounting plate 401 close to the base 100. An upper slide rail 403 is slidably connected to the lower slide rail 402. A vertical rod 404 is slidably arranged on the upper slide rail 403. A vertical rod 404 is fixedly mounted at the lower end of the vertical rod 404. A connecting frame 405 is provided with a conical fishing tube 406 fixedly mounted on the lower side of the connecting frame 405. The inner bottom of the conical fishing tube 406 has a conical tubular protrusion. A hollow floating block 407 matching its shape is slidably connected at the center of the protrusion, and a plurality of water leakage holes are provided on the protrusion. A transmission assembly 408 is provided on the upper slide rail 403. The transmission assembly 408 cooperates with the vertical plate 302 in transmission. When the vertical plate 302 moves back and forth, the transmission assembly 408 drives the vertical rod 404 to move in the opposite direction to the vertical plate 302.

[0033] The working principle and beneficial effects of the above technical solution are as follows: when it is necessary to scoop up the scum in the net bottom bucket 203, first push the upper slide rail 403 in the direction close to the net bottom bucket 203, so that the scooping assembly 400 moves as a whole to the top of the net bottom bucket 203, and at this time, the vertical plate 302 is driven by the driving device to move upward by a set distance to ensure that the coal sample does not float out of the liquid surface and is still a certain distance away from the scum, and the vertical plate 302 drives the net bottom bucket 203 to move upward synchronously, so that the scum originally adhered to the edge of the inner wall of the net bottom bucket 203 is separated, so as to prepare for fully scooping up the scum, and during the upward movement of the vertical plate 302, the transmission assembly 408 drives the conical scooping tube 406 to move downward, and during its downward movement , the hollow float 407 first contacts the liquid surface, and under the action of buoyancy, the float moves upward relative to the conical bailing tube 406, blocking its bottom, so that when the conical bailing tube 406 is completely immersed in the heavy liquid, the height difference between the liquid surface and the conical bailing tube 406 can be used to suck the scum together with part of the heavy liquid into the conical bailing tube 406. At this time, the scum has been separated from the inner wall of the net bottom bucket 203 in advance and can be smoothly sucked into the conical bailing tube 406. On the contrary, when the conical bailing tube 406 moves upward, the hollow float 407 is away from the conical bailing tube 406 under the action of gravity, so that the liquid accumulated in the tube can be smoothly drained along the leaking hole, and the scum can be automatically and stably bailed out, thereby improving the practicality of the device.

[0034] In a specific embodiment, a metal filter screen 409 matching the shape of the inner wall of the conical fishing tube 406 is detachably connected to the inside.

[0035] The working principle and beneficial effects of the above technical solution are as follows: the metal filter 409 is provided so that it can be disassembled at any time and the scum inside it can be poured out, and the scum can be cleaned at any time without stopping the operation of the device. At the same time, the metal filter 409 has a protruding part that is easy to hold, which makes it convenient for the staff to quickly complete the disassembly and assembly work.

[0036] In a specific embodiment: the transmission assembly 408 includes a push plate 4081 fixedly installed on the top of the vertical plate 302, a support plate 4082 is fixedly installed on the upper surface of the upper slide rail 403, the upper side of the support plate 4082 is rotatably connected to the rotating plate 4083, the upper end of the vertical rod 404 is fixedly connected to the mounting block 4084, both sides of the mounting block 4084 are fixedly connected to push rods 4085, each push rod 4085 is slidably connected to the rotating plate 4083, a corresponding position on the rotating plate 4083 is provided with a slide groove for the push rod 4085 to be embedded and slide, and a compression spring 4086 is sleeved on the vertical rod 404, and the spring is located between the upper slide rail 403 and the mounting block 4084.

[0037] The working principle and beneficial effects of the above technical solution are as follows: when the vertical plate 302 moves upward, the push plate 4081 thereon contacts and pushes the rotating plate 4083, so that the rotating plate 4083 rotates with the connection between itself and the support plate 4082 as the center of the circle, and the other side of the rotating plate 4083 presses down the push rod 4085, so that the push rod 4085 and the corresponding slide groove slide relative to each other, and at the same time, the push rod 4085 drives the vertical rod 404 to move downward, the compression spring 4086 is compressed, and then drives the conical scooping tube 406 to move downward, and vice versa, when the vertical plate 302 moves downward, the conical scooping tube 406 moves upward under the elastic force of the compression spring 4086, completing the entire scum scooping action.

[0038] In a specific embodiment, the guide groove 202 is provided with a plurality of equidistantly arranged sawtooth grooves 204 .

[0039] The working principle and beneficial effects of the above technical solution are as follows: in the process of transferring the mesh bottom bucket 203 and the coal sample therein from the low-density heavy liquid bucket 201 to the high-density heavy liquid bucket 201, the mesh bottom bucket 203 needs to be moved to the top of the low-density heavy liquid bucket 203 first, and the heavy liquid inside it needs to be drained as much as possible to avoid bringing it into the high-density heavy liquid bucket 201 to affect its actual density. In the process of moving the mesh bottom bucket to the upper side of the liquid surface of the heavy liquid bucket 201, the guide rod 303 will be in contact with the sawtooth The groove 204 slides relatively. Since the surface of the serrated groove 204 is uneven, the guide rod 303 will be bumpy when passing through, which indirectly causes the moving net bottom barrel 203 to shake, so that the coal sample at the bottom of the net bottom barrel 203 becomes loose due to the shaking, which accelerates the drainage of the liquid in the barrel, shortens the time spent on this step, and thus improves work efficiency. At the same time, when the net bottom barrel 203 shakes, it can also shake the scum adhered to its inner wall, making it convenient for the subsequent conical scooping pipe 406 to more thoroughly scoop out the scum.

[0040] In a specific embodiment: at least one stabilizing rod 4087 is fixedly installed on the upper side of the connecting frame 405, the stabilizing rod 4087 is slidably connected to the upper slide rail 403, a positioning bolt 4088 is threadedly connected to the upper slide rail 403, and a positioning groove for the bolt to be embedded is opened on the lower slide rail 402.

[0041] The working principle and beneficial effects of the above technical solution are: The setting of the stabilizing rod 4087 limits the moving track of the connecting frame 405, so that the connecting frame 405 can only move up and down stably in the vertical direction, thereby improving the stability of the device.

[0042] When the flotation assembly 400 is pushed to the top of the net bottom bucket 203, the positioning bolt 4088 is screwed downward so that the teeth of the positioning bolt 4088 are embedded in the positioning groove, and the upper slide rail 403 can be fixed relative to the lower slide rail 402 to prevent the upper slide rail 403 from deviating relative to the lower slide rail 402 when the support plate 4082 pushes the rotating plate 4083, thereby improving the stability of the device.

[0043] In a specific embodiment, the driving device is configured as a servo motor 102 , the output shaft of the servo motor 102 is fixedly connected to the central shaft 101 , an electric control box 103 is installed on the side of the sleeve 301 away from the supporting platform 200 , and the electric control box 103 is connected to the servo motor 102 by signal.

[0044] The working principle and beneficial effects of the above technical solution are as follows: the servo motor 102 is started by the control button on the electric control box 103, and the output shaft of the servo motor 102 is controlled to rotate in the set direction and angle according to a pre-set program. The rotation of the output shaft drives the central shaft 101 to rotate synchronously, thereby driving the support platform 200 to rotate.

[0045] In a specific embodiment, a plurality of auxiliary plates 104 are equidistantly mounted on the upper surface of the base 100 , and each auxiliary plate 104 is slidably matched with the lower surface of the carrying platform 200 .

[0046] The working principle and beneficial effects of the above technical solution are as follows: by setting the auxiliary plate 104, when the support platform 200 rotates, the sliding fit between the support platform 200 and the auxiliary plate 104 can be utilized to provide auxiliary supporting force to the support platform 200, thereby reducing the pressure on the central axis 101 and improving the stability of the device.

[0047] The above describes an embodiment of the present invention, but this embodiment is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make many forms, all of which are protected by this embodiment.

Claims

1. A coal floating and sinking test device, comprising a base (100) and a bearing platform (200) arranged directly above the base (100), wherein a central shaft (101) is rotatably mounted on the base (100), the upper end of the central shaft (101) is fixedly connected to the middle of the lower surface of the bearing platform (200), and a driving device for driving the central shaft (101) to rotate is arranged on the base (100), characterized in that: Also includes: A plurality of heavy liquid barrels (201) filled with heavy liquid are arranged at equal intervals on the carrying platform (200); corresponding positions on the carrying platform (200) are provided with receiving grooves for the heavy liquid barrels (201) to be embedded; a guide groove (202) in a regular undulating shape is provided on the outer peripheral wall of the carrying platform (200); and a net bottom bucket (203) is arranged above the carrying platform (200); The floating and sinking assembly (300) is arranged on the base (100) and is in transmission cooperation with the guide groove (202); when the support platform (200) rotates in a set direction, the guide groove (202) drives the floating and sinking assembly (300) to operate, and the floating and sinking assembly (300) drives the net bottom bucket (203) to reciprocate in the vertical direction.

2. A coal floating and sinking test device according to claim 1, characterized in that: The floating and sinking assembly (300) comprises a sleeve (301) fixedly mounted on the upper side of the base (100), a vertical plate (302) being slidably connected inside the sleeve (301), a guide rod (303) being fixedly connected on a plate body on a side of the vertical plate (302) close to the bearing platform (200), the guide rod (303) being slidably matched with the guide groove (202), and when the base (100) rotates, the guide groove (202) drives the guide rod (303) to reciprocate along the length direction of the vertical plate (302), a limiting groove for the guide rod (303) to move up and down is provided on the sleeve (301), a support frame (304) is fixedly connected on a plate body of the vertical plate (302) extending outside the sleeve (301), and an embedding groove matching the shape of the net bottom bucket (203) is provided on a side of the support frame (304) close to the bearing platform (200).

3. A coal floating and sinking test device according to claim 2, characterized in that: The base (100) is also provided with a flotation assembly (400) for scooping up scum floating in the net bottom bucket (203); The flotation assembly (400) comprises a mounting plate (401) fixedly mounted on the base (100) and arranged opposite to the vertical plate (302); a lower slide rail (402) is fixedly mounted on the side of the mounting plate (401) close to the base (100); an upper slide rail (403) is slidably connected to the lower slide rail (402); a vertical rod (404) is slidably arranged on the upper slide rail (403); a connecting frame (405) is fixedly mounted on the lower end of the vertical rod (404); a conical bailing tube (406) is fixedly mounted on the lower side of the connecting frame (405); the inner bottom of the conical bailing tube (406) has a conical tubular convex portion; a hollow floating block (407) matching the outer shape of the conical bailing tube is slidably connected to the center of the conical bailing tube; and a plurality of water leakage holes are provided on the conical bailing tube; A transmission assembly (408) is provided on the upper slide rail (403), and the transmission assembly (408) cooperates with the vertical plate (302) in transmission. When the vertical plate (302) moves back and forth, the transmission assembly (408) drives the vertical rod (404) and the vertical plate (302) to move in opposite directions.

4. A coal floating and sinking test device according to claim 3, characterized in that: A metal filter screen (409) matching the shape of the inner wall of the conical fishing tube (406) is detachably connected to the inside of the conical fishing tube (406).

5. A coal floating and sinking test device according to claim 4, characterized in that: The transmission assembly (408) comprises a push plate (4081) fixedly mounted on the top of the vertical plate (302); a support plate (4082) is fixedly mounted on the upper surface of the upper slide rail (403); a rotating plate (4083) is rotatably connected to the upper side of the support plate (4082); a mounting block (4084) is fixedly connected to the upper end of the vertical rod (404); push rods (4085) are fixedly connected to both sides of the mounting block (4084); each push rod (4085) is slidably connected to the rotating plate (4083); a sliding groove for the push rod (4085) to be embedded and slide is provided at a corresponding position on the rotating plate (4083); a compression spring (4086) is sleeved on the vertical rod (404), and the spring is located between the upper slide rail (403) and the mounting block (4084).

6. A coal floating and sinking test device according to claim 5, characterized in that: The guide groove (202) is provided with a plurality of sawtooth grooves (204) arranged at equal intervals.

7. A coal floating and sinking test device according to claim 6, characterized in that: At least one stabilizing rod (4087) is fixedly mounted on the upper side of the connecting frame (405); the stabilizing rod (4087) is slidably connected to the upper slide rail (403); a positioning bolt (4088) is threadedly connected to the upper slide rail (403); and a positioning groove for the bolt to be embedded is provided on the lower slide rail (402).

8. A coal floating and sinking test device according to claim 7, characterized in that: The driving device is configured as a servo motor (102), the output shaft of the servo motor (102) being fixedly connected to the central shaft (101), an electric control box (103) being installed on a side of the sleeve (301) away from the supporting platform (200), and the electric control box (103) being signal-connected to the servo motor (102).

9. A coal floating and sinking test device according to claim 8, characterized in that: A plurality of auxiliary plates (104) are equidistantly mounted on the upper surface of the base (100), and each of the auxiliary plates (104) is slidably matched with the lower surface of the bearing platform (200).

10. A method for using the coal floating and sinking test device according to claim 9, characterized in that: The following steps are involved: S1: First, heavy liquids of corresponding densities are poured into a plurality of heavy liquid barrels (201) one by one in order of density from small to large. In the initial state, the heavy liquid barrel (201) corresponding to the heavy liquid with the lowest density is located directly below the floating and sinking assembly (300). At this time, the net bottom barrel (203) containing the processed coal sample is placed in the embedding groove on the support frame (304). During this process, the lower end of the net bottom barrel (203) gradually sinks into the heavy liquid below, and the heavy liquid penetrates into the net bottom barrel (203) through the mesh holes of the screen on the lower side of the net bottom barrel (203), thereby immersing the coal sample; S2: Next, the driving device is started, and the driving device drives the central shaft (101) to rotate, thereby driving the supporting platform (200) to reciprocate within a relatively small angle. At this time, the guide groove (202) repeatedly pushes the guide rod (303), thereby driving the vertical plate (302) and the sleeve (301) to slide relative to each other. The vertical plate (302) is restricted in its movement trajectory by the sleeve (301), and can only move up and down within a small range in the vertical direction at this time, thereby driving the support frame (304) and the net bottom bucket (203) thereon to move up and down synchronously. In this way, the coal sample in the bucket is shaken to gradually loosen it and make it contact with the heavy liquid more fully. After shaking for one to two minutes, the net bottom bucket (203) is reset and left to stand for two minutes until the scum floats out. S3: When it is necessary to scoop out the scum in the net bottom bucket (203), the upper slide rail (403) is first pushed toward the net bottom bucket (203), so that the scooping assembly (400) moves as a whole to the top of the net bottom bucket (203). At this time, the vertical plate (302) is driven by the driving device to move upward by a set distance, and the vertical plate (302) drives the net bottom bucket (203) to move upward synchronously, so that the scum originally adhered to the edge of the inner wall of the net bottom bucket (203) is separated. During the upward movement of the vertical plate (302), the transmission assembly (408) drives the conical scooping tube (406) to move downward. During the process, the hollow floating block (407) first contacts the liquid surface. Under the action of buoyancy, the floating block moves upward relative to the conical bailing tube (406) to block the bottom thereof, so that when the conical bailing tube (406) is completely immersed in the heavy liquid, the height difference between the liquid surface and the inside of the conical bailing tube (406) can be used to suck the scum together with part of the heavy liquid into the conical bailing tube (406). On the contrary, when the conical bailing tube (406) moves upward, the hollow floating block (407) moves away from the conical bailing tube (406) under the action of gravity, so that the liquid accumulated in the tube can be smoothly drained out along the leaking hole. After the draining is completed, the upper slide rail (403) is pushed back. S4: Subsequently, the driving device drives the supporting platform (200) to continue rotating, so that the next heavy liquid barrel (201) with higher density moves toward the net bottom barrel (203). In the process of transferring the net bottom barrel (203) and the coal sample therein from the heavy liquid barrel (201) with lower density to the heavy liquid barrel (201) with higher density, the guide rod (303) and the guide groove (202) slide relative to each other, first from the lowest point of the concave part of the guide groove (202) to the upper convex part. The highest point moves. In the process of moving the net bottom bucket (203) to the upper side of the liquid surface of the heavy liquid bucket (201), the guide rod (303) and the sawtooth groove (204) will slide relative to each other. Since the surface of the sawtooth groove (204) is uneven, the guide rod (303) will bump when passing through, which indirectly drives the moving net bottom bucket (203) to shake, so that the coal sample at the bottom of the net bottom bucket (203) becomes loose due to the shaking, which accelerates the drainage of the liquid in the bucket and shortens the time spent on this step; S5: After the bottom of the net bottom bucket (203) is completely separated from the heavy liquid, the rotation is stopped and the net bottom bucket (203) is left to stand for two to three minutes. At this time, the net bottom bucket (203) moves to a position close to the edge of the heavy liquid bucket (201) with the lowest density, but still above it. After being shaken, the heavy liquid drained from the net bottom bucket (203) can quickly flow back into the heavy liquid bucket (201). After it is fully drained, the support platform (200) is continuously rotated so that the guide rod (303) passes over the highest point of the convex part of the guide groove (202) and moves to the lowest point of the concave part. With the rotation of the support platform (200), the net bottom bucket (203) can be smoothly sent into the next heavy liquid bucket (201) with higher density without the need for personnel to contact the net bottom bucket (203). This cycle is repeated to complete the entire test operation.

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