An anti-shunt device for density control in heavy medium coal preparation

Abstract

The present invention belongs to the technical field of heavy medium coal preparation, and specifically relates to an anti-shunt device for density control in heavy medium coal preparation; it includes a desliming screen, the desliming screen is divided into a dilute medium section and a combined medium section, the dilute medium section is fixedly connected to a main pipe 1, the other end of the main pipe 1 is communicated with a dilute medium tank, the combined medium section is fixedly connected to a main pipe 2, the other end of the main pipe 2 is communicated with a combined medium tank, the upper part of the main pipe 2 is fixedly connected to one end of a shunt branch pipe, the other end of the shunt branch pipe is fixedly connected to the lower part of the main pipe 1, and the upper part of the main pipe 1 is fixedly connected to one end of an anti-shunt pipe; the present invention effectively avoids the problem that when the anti-shunt pipe is blocked, the staff fails to react in time, resulting in the backflow of the dilute medium in the anti-shunt pipe, causing the density of the suspension in the combined medium tank to be too high or the liquid level to be too low. When the anti-shunt pipe is blocked, the dilute medium can still enter the combined medium tank to complete the anti-shunt process, solving the situation where the density of the suspension in the combined medium tank is too high or the liquid level is too low.

Description

Technical Field

[0001] The present invention belongs to the technical field of heavy medium coal preparation, and specifically relates to an anti-shunt device for controlling the density of heavy medium coal preparation. Background Art

[0002] During the process of heavy medium coal preparation, the density of the heavy medium suspension directly affects the actual separation density and has a crucial impact on the separation accuracy. In daily production, controlling the density of the suspension is an important link to obtain good process effects. The core of heavy medium density control includes three links: water replenishment, shunting, and medium addition, among which the automatic control of shunting is an important link. The shunting action process can be described as: the heavy medium suspension under the sieve of the arc screen or the combined medium section of the desliming screen of the heavy-selected clean coal product is shunted to the dilute suspension system through the shunt device, and after being purified and recovered by the magnetic separator, it is returned to the qualified medium tank. This part of the concentrated suspension volume is called the shunt flow. The shunting effect is mainly manifested in two points: (1) increasing the density of the heavy medium suspension; (2) reducing the coal slime content in the system. Therefore, shunting, as an important method and means for adjusting the density of the heavy medium suspension, plays an important role in the separation process of the heavy medium cyclone.

[0003] During the production process, there are often problems such as too high a level in the dilute medium tank, poor recovery effect of the magnetic separator, serious medium leakage, and inability to increase the density of the qualified medium in the rough separation. After analysis, it is found that due to the large diameter of the shunt pipe, the valve opening cannot be controlled, and it is difficult to control the shunting time length, resulting in a large amount of qualified medium entering the dilute medium tank. The magnetic separator operates under overload, and the feeding concentration is too high, resulting in a poor recovery effect of the magnetic separator, directly affecting the stability of the suspension density, causing fluctuations in product quality, and seriously restricting the normal production of the coal preparation plant. Therefore, an anti-shunt device has emerged, which can adjust the density of the suspension in the combined medium tank and the level of the combined medium tank.

[0004] In the prior art, the inner wall of the anti-shunt pipe in most anti-shunt devices will be attached with impurities such as coal slime after long-term use, causing blockage, which in turn affects the anti-shunt process. Although some anti-shunt devices are equipped with anti-blocking pipes, generally, such anti-blocking pipes directly guide the blocked dilute medium in the anti-shunt pipe back to the dilute medium tank, which solves the blockage problem to a certain extent. However, when the density of the suspension in the combined medium tank is too high or the liquid level drops and needs to be adjusted in time, the existing anti-shunt devices cannot solve it quickly.

[0005] Therefore, the present invention provides an anti-shunt device for controlling the density of heavy medium coal preparation. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: An anti-shunt device for density control in heavy medium coal preparation described in the present invention includes a desliming screen, which is divided into a dilute medium section and a combined medium section. The dilute medium section is fixedly connected to a main pipe 1, and the other end of the main pipe 1 is communicated with a dilute medium tank. The combined medium section is fixedly connected to a main pipe 2, and the other end of the main pipe 2 is communicated with a combined medium tank. The upper part of the main pipe 2 is fixedly connected to one end of a shunt branch pipe, and the other end of the shunt branch pipe is fixedly connected to the lower part of the main pipe 1. The upper part of the main pipe 1 is fixedly connected to one end of an anti-shunt pipe, and the other end of the anti-shunt pipe is communicated with the combined medium tank. A clogging prevention pipe is fixedly connected to the top on one side of the anti-shunt pipe close to the main pipe 1, and the other end of the clogging prevention pipe is communicated with the combined medium tank. A pressure reduction cavity is provided at one end of the clogging prevention pipe connected to the anti-shunt pipe. The pressure reduction cavity is in the shape of a funnel after the two ends are combined. A sealing ring is fixed on the inner wall of the clogging prevention pipe above the pressure reduction cavity. The sealing ring is provided with a limiting cavity 1, and a telescopic component is slidably connected in the limiting cavity 1. The bottom end of the telescopic component penetrates through the sealing ring and is connected to a sealing plate. A spring 1 is provided between the limiting cavity 1 and the telescopic component. The bottom end of the sealing plate is fixedly connected to a soft storage component. A sponge body is provided in the inner cavity of the soft storage component, and through holes are evenly formed in the side wall of the soft storage component. Butterfly valves are installed at both ends of the anti-shunt pipe;In the prior art, the anti-shunt pipes in most anti-shunt devices will be blocked due to impurities such as slime adhering to the inner wall after long-term use, thus affecting the anti-shunt process. Although anti-blocking pipes are installed in some anti-shunt devices, generally, such anti-blocking pipes directly guide the blocked dilute medium in the anti-shunt pipe back to the dilute medium tank. To a certain extent, this solves the problem of blockage. However, when the density of the suspension in the combined medium tank is too high or the liquid level drops and needs to be adjusted in time, the existing anti-shunt devices cannot solve it quickly. At this time, when the present invention is working and normal shunting and anti-shunting are carried out, the combined medium can be shunted into the dilute medium, and the dilute medium can also be anti-shunted into the combined medium. Moreover, when the anti-shunt pipe is not blocked, the flow rate and pressure of the dilute medium are small, so that it cannot be shunted directly from the anti-blocking pipe through the decompression chamber. When the content of slime and other impurities adhering to the inner wall of the anti-shunt pipe increases, the anti-shunt pipe will become more and more blocked, causing the dilute medium to accumulate continuously in the anti-blocking pipe until the decompression chamber is filled and the sponge in the soft storage part is contacted. After the sponge is soaked, its weight increases, driving the sealing plate away from the blocking ring, and at the same time stretching the first spring, and the telescopic assembly slides out. Then, it is convenient for the dilute medium to enter the upper anti-blocking pipe between the sealing plate and the blocking ring, and finally enter the combined medium tank to complete the anti-shunt, effectively avoiding the problem that when the anti-shunt pipe is blocked, the dilute medium in the anti-shunt pipe flows back due to the staff's inability to react in time, resulting in too high density or too low liquid level of the suspension in the combined medium tank. When the anti-shunt pipe is blocked, the dilute medium can still enter the combined medium tank to complete the anti-shunt process, solving the situation of too high density or too low liquid level of the suspension in the combined medium tank. When the staff completes the dredging of the anti-shunt pipe, the dilute medium will return to the anti-shunt pipe again and no longer pass through the anti-blocking pipe. At this time, the liquid level in the anti-blocking pipe drops, and the sponge gradually dehydrates, so that the sealing plate fits with the blocking ring again under the elastic force of the first spring to complete the blocking, which is convenient for continued use when the anti-shunt pipe is blocked next time.

[0008] Preferably, the telescopic assembly includes a first annular member and a second annular member. A first limiting groove is formed in the inner wall of the first limiting cavity. A first limiting block is slidably connected in the first limiting groove. The first limiting block is fixedly connected to the first annular member. Two ends of the first spring are respectively fixedly connected to the first annular member and the inner wall of the first limiting cavity. A second limiting cavity is arranged in the first annular member. A second annular member is rotatably connected in the second limiting cavity. The bottom end of the second annular member penetrates through the first annular member and is fixedly connected to the sealing plate. The bottom end of the first annular member penetrates through the plugging ring and fits against the top of the sealing plate. Through grooves are formed in both the first annular member and the second annular member. A pressing plate is fixedly connected to the bottom end of the soft storage member. A rotating assembly is arranged in the pressure reducing cavity. The rotating assembly extends outside the pressure reducing cavity. The bottom end of the pressing plate is connected to the rotating assembly. When the reverse shunt pipe is blocked and it is necessary to adjust the flow rate of the dilute medium to control the density of the suspension in the medium mixing barrel, the staff drives the pressing plate to rotate by rotating the rotating assembly, so that the sealing plate and the second annular member rotate accordingly. Also, due to the limiting effect between the first limiting block and the first limiting groove on the first annular member, the second annular member rotates relative to the first annular member. At this time, the through grooves on the first annular member and the second annular member are misaligned, resulting in a decrease in the flow rate of the dilute medium. By controlling the rotation angle of the rotating assembly, the purpose of adjusting the flow rate of the dilute medium to control the density and liquid level of the suspension in the medium mixing barrel can be achieved.

[0009] Preferably, the rotating assembly includes a driving shaft, a coupling, a sleeve shaft, and a telescopic shaft. A coupling is arranged in the pressure reducing cavity. The lower part of the outer wall of the pressure reducing cavity is rotatably connected to a driving shaft. One end of the driving shaft extends into the pressure reducing cavity and is rotatably connected to the sleeve shaft through the coupling. A telescopic shaft is slidably connected in the sleeve shaft. The top end of the telescopic shaft is fixedly connected to the bottom end of the pressing plate. When rotating the rotating assembly, the sleeve shaft rotates accordingly under the action of the coupling by rotating the driving shaft, so that the telescopic shaft drives the pressing plate and the sealing plate to rotate, realizing the control and adjustment of the flow rate of the dilute medium when the reverse shunt pipe is blocked.

[0010] Preferably, second limiting grooves are arranged on both sides of the inner cavity of the sleeve shaft. Second limiting blocks are slidably connected in the second limiting grooves. The second limiting blocks are fixedly connected to the bottom of the telescopic shaft. A second spring is fixedly connected to the bottom of the inner cavity of the sleeve shaft. The top end of the second spring is fixedly connected to the bottom end of the telescopic shaft. The sleeve shaft can drive the telescopic shaft to rotate together through the limiting effect between the second limiting blocks and the second limiting grooves. The second spring arranged in the sleeve shaft can not only strengthen the fitting effect between the sealing plate and the plugging ring when the reverse shunt pipe is not blocked, but also give an upward force to the pressing plate when the reverse shunt pipe is unblocked and the sponge body dehydrates, so that the pressing plate squeezes the sponge body in the soft storage member, accelerating the dehydration process of the sponge body.

[0011] Preferably, one end of the driving shaft away from the coupling extends to the outside of the decompression chamber and is sleeved with a rotating wheel, elastic balls are evenly fixed to the inner side of the rotating wheel, a fixing ring is fixed to the outer wall of the decompression chamber, a hemispherical groove is provided on the outer side of the fixing ring, the elastic ball fits with the hemispherical groove, and the driving shaft passes through the fixing ring; the rotation of the driving shaft can be driven by rotating the rotating wheel, and the elastic ball on the rotating wheel can cooperate with the hemispherical groove on the fixing ring to fix the driving shaft after adjusting the flow rate of the dilute medium, thereby avoiding the rotation of the driving shaft and causing a change in the flow rate of the dilute medium.

[0012] Preferably, a liquid level gauge is installed on the pipe wall of the anti-blocking pipe, a drainage pipe 1 is fixedly connected to the bottom of one side of the reverse diversion pipe close to the main pipe 1, a mounting ring is fixedly connected to the inner wall of the end of the drainage pipe 1, the inner side surface of the mounting ring is funnel-shaped, a flushing pipe passes through the center of the mounting ring, one end of the flushing pipe is externally connected to a water pump, the inner end of the flushing pipe extends to the inner cavity of the reverse diversion pipe and is fixedly connected to a power part, a water storage part, a water spraying part and an assembly part are sequentially provided on the side of the power part away from the flushing pipe, the water storage part is fixedly connected to the power part, the bottom of the side wall of the power part is connected to the water storage part through a plurality of conical connecting holes, a sealing ring is rotatably connected to the water storage part, a hollow tube is evenly fixedly connected to the sealing ring, both ends of the hollow tube are respectively connected to the water storage part and the water spraying part, a water spraying hole 1 is evenly opened on the outer wall of the water spraying part, the water spraying hole 1 is distributed in a ring shape, the assembly part and the mounting ring Correspondingly, a drain pipe 2 is fixedly connected to the bottom of one side of the reverse diversion pipe close to the combined medium barrel, and an end cap is threadedly connected to the drain pipe 2, and the drain pipe 1 and the drain pipe 2 form an "eight" shape; when the reverse diversion pipe is blocked and the dilute medium passes through the anti-blocking pipe, the liquid level gauge on the anti-blocking pipe senses and feeds back to warn the staff, and the staff can close the butterfly valves at both ends of the reverse diversion pipe, open the drain pipe 2, and squeeze the assembly parts out of the mounting ring. Because the flushing pipe is a hose with a certain hardness, the unwinding flushing pipe allows the assembly parts to penetrate into the reverse diversion pipe. At this time, water is passed into the flushing pipe through an external water pump, and the water flows through the power part and the water storage part and is sprayed out from the water spray hole 1 on the water spray part to impact the inner cavity of the reverse diversion pipe, so that the impurities such as coal slime blocked in the reverse diversion pipe are dispersed and discharged from the drain pipe 1 and the drain pipe 2, completing the dredging of the reverse diversion pipe, and at the same time, the flow of the dilute medium in the anti-blocking pipe is not affected.

[0013] Preferably, a first connecting pipe and a second connecting pipe are symmetrically and fixedly connected to the inner side end of the flushing pipe. Valves are installed on both the first connecting pipe and the second connecting pipe. Two groups of arc-shaped power plates are evenly arranged in the inner cavity of the power member, and two spray heads are symmetrically installed on the power member. The two spray heads are fixedly connected to the first connecting pipe and the second connecting pipe respectively. A rotating shaft is fixed on the inner wall of the water spraying member. The other end of the rotating shaft passes through the water storage member and the power member and is rotatably connected to the flushing pipe. Both groups of arc-shaped power plates are sleeved on the rotating shaft, and the two groups of arc-shaped power plates form an inverted "V" shape. When the flushing pipe extends into the reverse diversion pipe, the valve on the first connecting pipe is opened, and the valve on the second connecting pipe is closed. At this time, the water in the flushing pipe is sprayed out through one of the spray heads on the power member to impact a group of arc-shaped power plates, causing the rotating shaft to rotate in one direction, and then causing the water spraying member to rotate accordingly, so that the water sprayed out from the first water spraying hole on the water spraying member forms a water spraying surface, strengthening the impact effect on the blockage in the reverse diversion pipe. When the flushing pipe slides out of the reverse diversion pipe, the valve on the second connecting pipe is opened, and the valve on the first connecting pipe is closed, causing the other spray head to impact the other group of arc-shaped power plates in the opposite direction, and then causing the water spraying member to rotate in the reverse direction. Because the rotation direction of the water spraying member is opposite to that before, the water flow direction sprayed out from the first water spraying hole also changes accordingly, forming a reverse water spraying surface, and impacting the blockage in the reverse diversion pipe from another direction, improving the dredging effect.

[0014] Preferably, second water spraying holes and third water spraying holes are evenly arranged on both sides of the outer wall of the water spraying member respectively. The first water spraying hole is located in the middle of the second water spraying hole and the third water spraying hole. The first water spraying hole and the second water spraying hole are both inclined outward, and the first water spraying hole, the second water spraying hole and the third water spraying hole are all tapered holes. An electromagnetic blocking component is arranged in the inner cavity of the water spraying member, and the electromagnetic blocking component corresponds to the second water spraying hole and the third water spraying hole. When the flushing pipe extends into the reverse diversion pipe, the third water spraying hole is blocked by the electromagnetic component. At this time, the water only sprays out from the first water spraying hole and the second water spraying hole. The water sprayed out from the second water spraying hole can not only give a backward force to the flushing pipe, making it more convenient for the staff to extend the flushing pipe into the reverse diversion pipe, playing a guiding role, but also impact the blockage in the reverse diversion pipe again after the impact of the first water spraying hole, improving the dredging effect. When the flushing pipe slides out of the reverse diversion pipe, the second water spraying hole is blocked by the electromagnetic blocking component, so that the water only sprays out from the first water spraying hole and the third water spraying hole. The water sprayed out from the third water spraying hole can give a backward force to the flushing pipe, making it more convenient for the staff to slide the flushing pipe out. At the same time, it can impact the blockage in the reverse diversion pipe again after the impact of the first water spraying hole, improving the dredging effect.

[0015] Preferably, the electromagnetic blocking assembly includes a permanent magnet and an electromagnet, electromagnets are fixedly connected to both sides of the inner cavity of the power part, a permanent magnet is arranged between the two electromagnets, the permanent magnet is slidably connected to the inner cavity of the power part, the permanent magnet and the electromagnet are both annular and sleeved on the rotating shaft, a sealing ring is fixedly connected to the outer wall of the permanent magnet, and the cross-section of the sealing ring corresponds to water spray hole one and water spray hole two; when the flushing pipe goes deeper into the reverse diversion pipe, the electromagnet close to the side of the assembly is energized, so that the permanent magnet fits therewith under the action of magnetic attraction, and the blocking of water spray hole three is completed; when the flushing pipe slides out of the reverse diversion pipe, the electromagnet far from the assembly is energized, so that the permanent magnet fits therewith under the action of magnetic attraction, and the blocking of water spray hole two is completed, thereby facilitating the staff to further clear the blockage in the reverse diversion pipe.

[0016] Preferably, a plurality of annular sealing grooves are provided on the inner side surface of the mounting ring, and annular sealing strips are evenly fixed on the outer wall of the assembly part, and the annular sealing strips correspond to the annular sealing grooves one by one; when the reverse diversion pipe is unblocked, the staff slides the flush pipe out of the reverse diversion pipe so that the assembly part fits with the mounting ring again, and the annular sealing strip on the assembly part cooperates with the annular sealing groove on the mounting ring to ensure the sealing between the two, thereby preventing the dilute medium from leaking from the discharge pipe when flowing from the reverse diversion pipe.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The back-diversion device for density control of heavy medium coal preparation described in the present invention effectively avoids the problem of backflow of dilute medium in the back-diversion pipe resulting in excessive density or excessively low liquid level in the combined medium barrel due to the staff's lack of time to react when the back-diversion pipe is blocked, so that when the back-diversion pipe is blocked, the dilute medium can still enter the combined medium barrel to complete the back-diversion process, thereby solving the problem of excessive density or excessively low liquid level in the combined medium barrel.

[0019] 2. The reverse diversion device for density control of heavy medium coal preparation described in the present invention drives the pressure plate to rotate by rotating the rotating assembly, so that the sealing plate and the ring part 2 rotate accordingly, and because of the limiting effect between the limiting block 1 and the limiting groove 1 on the ring part 1, the ring part 2 and the ring part 1 rotate relative to each other. At this time, the through grooves on the ring part 1 and the ring part 2 are misaligned, so that the flow rate of the dilute medium is reduced. By controlling the rotation angle of the rotating assembly, the purpose of adjusting the flow rate of the dilute medium and controlling the density and liquid level of the suspension in the mixing barrel can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 is a system structure diagram of the anti-diverting device of the present invention;

[0022] Figure 2 is a perspective view of the anti-shunt tube of the present invention;

[0023] Figure 3 is a partial cross-sectional view of the pressure reducing cavity of the anti-blocking tube of the present invention;

[0024] Figure 4 is Figure 3 a partially enlarged view at position A in

[0025] Figure 5 is Figure 3 a partially enlarged view at position B in

[0026] Figure 6 is Figure 3 a partially enlarged view at position C in

[0027] Figure 7 is a partial cross-sectional view of the anti-shunt tube of the present invention;

[0028] Figure 8 is Figure 7 a partially enlarged view at position D in

[0029] Figure 9 is Figure 7 a partially enlarged view at position E in

[0030] Figure 10 is a perspective view of the plugging ring and the rotating assembly of the present invention;

[0031] Figure 11 is a perspective view of the telescopic assembly of the present invention;

[0032] Figure 12 is a perspective view of the second annular member of the present invention;

[0033] Figure 13 is a perspective view of the power member and the water spraying member of the present invention;

[0034] Figure 14 is a partial cross-sectional view of the power member of the present invention

[0035] In the figure: 1. Dilute medium section; 2. Combined medium section; 3. Main pipe one; 4. Main pipe two; 5. Shunt branch pipe; 6. Reverse shunt pipe; 7. Combined medium barrel; 8. Dilute medium barrel; 9. Anti-blocking pipe; 10. Pressure reduction cavity; 11. Drain pipe one; 12. Drain pipe two; 13. Sealing ring; 14. Spring one; 15. Sealing plate; 16. Soft storage member; 17. Sponge body; 18. Pressing plate; 19. Ring member one; 20. Ring member two; 21. Driving shaft; 22. Coupling; 23. Sleeve shaft; 24. Telescopic shaft; 25. Spring two; 26. Runner; 27. Elastic clamping ball; 28. Fixed ring; 29. Flushing water pipe; 30. Installation ring; 31. Power member; 32. Water storage member; 33. Water spraying member; 34. Fitting; 35. Connecting pipe one; 36. Connecting pipe two; 37. Nozzle; 38. Arc-shaped power plate; 39. Rotating shaft; 40. Permanent magnet; 41. Electromagnet; 42. Water spraying hole one; 43. Water spraying hole two; 44. Water spraying hole three; 45. Medium separating screen. Detailed implementation manner

[0036] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0037] Such as Figures 1 - 14As shown in the figure, an anti-shunt device for density control in heavy medium coal separation according to an embodiment of the present invention includes a desliming screen 45. The desliming screen 45 is divided into a dilute medium section 1 and a combined medium section 2. The dilute medium section 1 is fixedly connected to a main pipe 1 3. The other end of the main pipe 1 3 is communicated with a dilute medium tank 8. The combined medium section 2 is fixedly connected to a main pipe 2 4. The other end of the main pipe 2 4 is communicated with a combined medium tank 7. The upper part of the main pipe 2 4 is fixedly connected to one end of a shunt branch pipe 5. The other end of the shunt branch pipe 5 is fixedly connected to the lower part of the main pipe 1 3. The upper part of the main pipe 1 3 is fixedly connected to one end of an anti-shunt pipe 6. The other end of the anti-shunt pipe 6 is communicated with the combined medium tank 7. A plugging prevention pipe 9 is fixedly connected to the top of one side of the anti-shunt pipe 6 close to the main pipe 1 3. The other end of the plugging prevention pipe 9 is communicated with the combined medium tank 7. A pressure reducing cavity 10 is provided at one end of the plugging prevention pipe 9 connected to the anti-shunt pipe 6. The pressure reducing cavity 10 is in the shape of a funnel after the two ends are combined. A plugging ring 13 is fixed on the inner wall of the plugging prevention pipe 9 above the pressure reducing cavity 10. The plugging ring 13 is provided with a first limiting cavity. A telescopic assembly is slidably connected in the first limiting cavity. The bottom end of the telescopic assembly penetrates through the plugging ring 13 and is connected to a sealing plate 15. A first spring 14 is provided between the first limiting cavity and the telescopic assembly. The bottom end of the sealing plate 15 is fixedly connected to a soft storage member 16. A sponge body 17 is provided in the inner cavity of the soft storage member 16, and through holes are uniformly formed in the side wall of the soft storage member 16. Butterfly valves are installed at both ends of the anti-shunt pipe 6;In the prior art, the anti-shunt pipe 6 in most anti-shunt devices will be blocked due to impurities such as slime adhering to the inner wall after long-term use, thus affecting the anti-shunt process. Although anti-blocking pipes are installed in some anti-shunt devices, generally, such anti-blocking pipes directly guide the blocked dilute medium in the anti-shunt pipe 6 back to the dilute medium tank 8. To a certain extent, this solves the problem of blockage. However, when the density of the suspension in the combined medium tank 7 is too high or the liquid level drops and needs to be adjusted in a timely manner, the existing anti-shunt devices cannot solve it quickly. At this time, when the present invention is working and normal shunting and anti-shunting are carried out, the combined medium can be shunted into the dilute medium, and the dilute medium can also be anti-shunted into the combined medium. And when the anti-shunt pipe 6 is not blocked, the flow rate and pressure of the dilute medium are relatively small, so that it cannot be shunted directly from the anti-blocking pipe 9 through the decompression chamber 10. When the content of slime and other impurities adhering to the inner wall of the anti-shunt pipe 6 increases, the anti-shunt pipe 6 will become more and more blocked, causing the dilute medium to accumulate continuously in the anti-blocking pipe 9 until it fills the decompression chamber 10 and contacts the sponge body 17 in the soft storage member 16. After the sponge body 17 is soaked, its weight increases, driving the sealing plate 15 away from the sealing ring 13, and at the same time stretching the first spring 14, and the telescopic assembly slides out. Then it is convenient for the dilute medium to enter the upper anti-blocking pipe 9 between the sealing plate 15 and the sealing ring 13, and finally enter the combined medium tank 7 to complete the anti-shunt. This effectively avoids the problem that when the anti-shunt pipe 6 is blocked, the staff fails to react in time, resulting in the backflow of the dilute medium in the anti-shunt pipe 6, causing the density of the suspension in the combined medium tank 7 to be too high or the liquid level to be too low. When the anti-shunt pipe 6 is blocked, the dilute medium can still enter the combined medium tank 7 to complete the anti-shunt process, solving the situation where the density of the suspension in the combined medium tank 7 is too high or the liquid level is too low. When the staff completes the dredging of the anti-shunt pipe 6, the dilute medium will return to the anti-shunt pipe 6 again and no longer pass through the anti-blocking pipe 9. At this time, the liquid level in the anti-blocking pipe 9 drops, and the sponge body 17 gradually dehydrates, so that the sealing plate 15 fits with the sealing ring 13 again under the elastic force of the first spring 14 to complete the sealing, facilitating the continued use when the anti-shunt pipe 6 is blocked next time.;

[0038] The telescopic assembly includes a first annular member 19 and a second annular member 20. A first limiting groove is provided on the inner wall of the first limiting cavity. A first limiting block is slidably connected in the first limiting groove. The first limiting block is fixedly connected to the first annular member 19. The two ends of the first spring 14 are respectively fixedly connected to the first annular member 19 and the inner wall of the first limiting cavity. A second limiting cavity is provided in the first annular member 19. A second annular member 20 is rotatably connected in the second limiting cavity. The bottom end of the second annular member 20 penetrates through the first annular member 19 and is fixedly connected to the sealing plate 15. The bottom end of the first annular member 19 penetrates through the blocking ring 13 and fits against the top of the sealing plate 15. Through grooves are provided on both the first annular member 19 and the second annular member 20. The bottom end of the soft storage member 16 is fixedly connected to a pressing plate 18. A rotating assembly is provided in the pressure reducing cavity 10. The rotating assembly extends outside the pressure reducing cavity 10. The bottom end of the pressing plate 18 is connected to the rotating assembly. During operation, when the reverse shunt pipe 6 is blocked and the flow rate of the dilute medium needs to be adjusted to control the density of the suspension in the combined medium tank 7, the staff rotates the rotating assembly to drive the pressing plate 18 to rotate, so that the sealing plate 15 and the second annular member 20 rotate accordingly. Also, due to the limiting effect between the first limiting block on the first annular member 19 and the first limiting groove, relative rotation occurs between the second annular member 20 and the first annular member 19. At this time, the through grooves on the first annular member 19 and the second annular member 20 are misaligned, resulting in a decrease in the flow rate of the dilute medium. By controlling the rotation angle of the rotating assembly, the purpose of adjusting the flow rate of the dilute medium to control the density and liquid level of the suspension in the combined medium tank 7 can be achieved.

[0039] The rotating assembly includes a driving shaft 21, a coupling 22, a sleeve shaft 23, and a telescopic shaft 24. The coupling 22 is provided in the pressure reducing cavity 10. The lower part of the outer wall of the pressure reducing cavity 10 is rotatably connected to the driving shaft 21. One end of the driving shaft 21 extends into the pressure reducing cavity 10 and is rotatably connected to the sleeve shaft 23 through the coupling 22. The telescopic shaft 24 is slidably connected in the sleeve shaft 23. The top end of the telescopic shaft 24 is fixedly connected to the bottom end of the pressing plate 18. During operation, when rotating the rotating assembly, by rotating the driving shaft 21, the sleeve shaft 23 rotates accordingly under the action of the coupling 22, and then the telescopic shaft 24 drives the pressing plate 18 and the sealing plate 15 to rotate, realizing the control and adjustment of the flow rate of the dilute medium when the reverse shunt pipe 6 is blocked.

[0040] Limiting grooves 2 are provided on both sides of the inner cavity of the sleeve shaft 23, and limiting blocks 2 are slidably connected in the limiting grooves 2. The limiting blocks 2 are fixedly connected to the bottom of the telescopic shaft 24, and springs 25 are fixedly connected to the bottom of the inner cavity of the sleeve shaft 23, and the top of the springs 25 are fixedly connected to the bottom end of the telescopic shaft 24. During operation, the sleeve shaft 23 can drive the telescopic shaft 24 to rotate together through the limiting action between the limiting blocks 2 and the limiting grooves 2. The springs 25 provided in the sleeve shaft 23 can not only strengthen the fitting effect between the sealing plate 15 and the blocking ring 13 when the reverse shunt pipe 6 is not blocked, but also give an upward force to the pressure plate 18 when the sponge 17 is dehydrated after the reverse shunt pipe 6 is unblocked, so that the pressure plate 18 squeezes the sponge 17 in the soft storage component 16, thereby accelerating the dehydration process of the sponge 17.

[0041] The end of the driving shaft 21 away from the coupling 22 extends to the outside of the decompression chamber 10 and is sleeved with the rotating wheel 26. Elastic clamping balls 27 are evenly fixed to the inner side of the rotating wheel 26. A fixing ring 28 is fixed to the outer wall of the decompression chamber 10. A hemispherical groove is opened on the outer side of the fixing ring 28. The elastic clamping ball 27 fits with the hemispherical groove, and the driving shaft 21 passes through the fixing ring 28. When working, the rotation of the driving shaft 21 can be driven by rotating the rotating wheel 26. The elastic clamping ball 27 on the rotating wheel 26 can cooperate with the hemispherical groove on the fixing ring 28 to fix the driving shaft 21 after adjusting the flow rate of the dilute medium, so as to avoid the rotation of the driving shaft 21 causing a change in the flow rate of the dilute medium.

[0042] A liquid level gauge is installed on the pipe wall of the anti-blocking pipe 9. One side bottom of the reverse shunt pipe 6 close to the main pipe 3 is fixedly connected with a first discharge pipe 11. An installation ring 30 is fixedly connected to the inner wall of the end of the first discharge pipe 11. The inner side surface of the installation ring 30 is funnel-shaped. A flushing water pipe 29 penetrates through the center of the installation ring 30. One end of the flushing water pipe 29 is externally connected to a water pump. The inner side end of the flushing water pipe 29 extends into the inner cavity of the reverse shunt pipe 6 and is fixedly connected with a power component 31. A water storage component 32, a water spraying component 33 and a fitting component 34 are sequentially arranged on the side of the power component 31 away from the flushing water pipe 29. The water storage component 32 is fixedly connected with the power component 31. The bottom side wall of the power component 31 is communicated with the water storage component 32 through a plurality of conical connection holes. A sealing ring is rotatably connected to the water storage component 32. Hollow pipes are uniformly fixedly connected to the sealing ring. The two ends of the hollow pipe are respectively communicated with the water storage component 32 and the water spraying component 33. A first water spraying hole 42 is uniformly arranged on the outer wall of the water spraying component 33. The first water spraying holes 42 are annularly distributed. The fitting component 34 corresponds to the installation ring 30. One side bottom of the reverse shunt pipe 6 close to the combined medium barrel 7 is fixedly connected with a second discharge pipe 12. An end cover is threadedly connected to the second discharge pipe 12. The first discharge pipe 11 and the second discharge pipe 12 form an "eight" shape; during operation, when the reverse shunt pipe 6 is blocked and the dilute medium passes through the anti-blocking pipe 9, the liquid level gauge on the anti-blocking pipe 9 senses and feeds back to warn the staff. The staff can close the butterfly valves at both ends of the reverse shunt pipe 6, open the second discharge pipe 12, and extrude the fitting component 34 from the installation ring 30. Also, because the flushing water pipe 29 is a flexible pipe with a certain hardness, unwind the flushing water pipe 29 to make the fitting component 34 penetrate into the reverse shunt pipe 6. At this time, water is passed into the flushing water pipe 29 through an externally connected water pump. The water flows through the power component 31 and the water storage component 32 and sprays out from the first water spraying holes 42 on the water spraying component 33 to impact the inner cavity of the reverse shunt pipe 6, so that the blocked coal slime and other impurities in the reverse shunt pipe 6 are flushed away and discharged from the first discharge pipe 11 and the second discharge pipe 12, completing the dredging of the reverse shunt pipe 6, and at the same time having no influence on the flow of the dilute medium section 1 in the anti-blocking pipe 9.

[0043] On the inner side ends of the flushing water pipe 29, a first connecting pipe 35 and a second connecting pipe 36 are symmetrically and fixedly connected. Valves are installed on both the first connecting pipe 35 and the second connecting pipe 36. Two groups of arc-shaped power plates 38 are evenly arranged in the inner cavity of the power member 31, and two spray nozzles 37 are symmetrically installed on the power member 31. The two spray nozzles 37 are fixedly connected to the first connecting pipe 35 and the second connecting pipe 36 respectively. A rotating shaft 39 is fixed on the inner wall of the water spraying member 33. The other end of the rotating shaft 39 penetrates through the water storage member 32 and the power member 31 and is rotatably connected to the flushing water pipe 29. Both groups of arc-shaped power plates 38 are sleeved on the rotating shaft 39, and the two groups of arc-shaped power plates 38 form an inverted "eight" shape; during operation, when the flushing water pipe 29 extends into the reverse diversion pipe 6, the valve on the first connecting pipe 35 is opened, and the valve on the second connecting pipe 36 is closed. At this time, the water in the flushing water pipe 29 is sprayed out through one of the spray nozzles 37 on the power member 31 to impact one group of arc-shaped power plates 38, causing the rotating shaft 39 to rotate in one direction, and then causing the water spraying member 33 to rotate accordingly, so that the water sprayed out from the first water spraying holes 42 on the water spraying member 33 forms a water spraying surface, strengthening the impact effect on the blockage in the reverse diversion pipe 6. When the flushing water pipe 29 slides out of the reverse diversion pipe 6, the valve on the second connecting pipe 36 is opened, and the valve on the first connecting pipe 35 is closed, so that the other spray nozzle 37 starts to impact the other group of arc-shaped power plates 38 with the opposite direction, and then causes the water spraying member 33 to rotate in the reverse direction. Because the rotation direction of the water spraying member 33 is opposite to that before, the water flow direction of the water sprayed out from the first water spraying holes 42 at this time is also opposite, forming a reverse water spraying surface, and impacting the blockage in the reverse diversion pipe 6 from another direction, improving the dredging effect.

[0044] On both sides of the outer wall of the water spraying member 33, a second water spraying hole 43 and a third water spraying hole 44 are respectively and evenly provided. The first water spraying hole 42 is located in the middle of the second water spraying hole 43 and the third water spraying hole 44. The first water spraying hole 42 and the second water spraying hole 43 are both inclined outward. Moreover, the first water spraying hole 42, the second water spraying hole 43, and the third water spraying hole 44 are all tapered holes. An electromagnetic plugging assembly is provided in the inner cavity of the water spraying member 33, and the electromagnetic plugging assembly corresponds to the second water spraying hole 43 and the third water spraying hole 44. During operation, when the flushing water pipe 29 extends into the reverse flow dividing pipe 6, the third water spraying hole 44 is plugged by the electromagnetic assembly. At this time, the water only sprays out from the first water spraying hole 42 and the second water spraying hole 43. The water sprayed out from the second water spraying hole 43 can not only give a backward acting force to the flushing water pipe 29 to make it more convenient for the staff to extend the flushing water pipe 29 into the reverse flow dividing pipe 6, playing a guiding role, but also can impact the blockage in the reverse flow dividing pipe 6 again after the first water spraying hole 42 finishes the impact, improving the dredging effect. When the flushing water pipe 29 slides out of the reverse flow dividing pipe 6, the second water spraying hole 43 is plugged by the electromagnetic plugging assembly, making the water only spray out from the first water spraying hole 42 and the third water spraying hole 44. The water sprayed out from the third water spraying hole 44 can give a backward acting force to the flushing water pipe 29 to make it more convenient for the staff to slide out the flushing water pipe 29. At the same time, it can impact the blockage in the reverse flow dividing pipe 6 again after the first water spraying hole 42 finishes the impact, improving the dredging effect.

[0045] The electromagnetic plugging assembly includes a permanent magnet 40 and an electromagnet 41. Electromagnets 41 are fixedly connected to both sides of the inner cavity of the power member 31. A permanent magnet 40 is provided between the two electromagnets 41. The permanent magnet 40 is slidably connected to the inner cavity of the power member 31. The permanent magnet 40 and the electromagnet 41 are both annular and sleeved on the rotating shaft 39. A sealing ring is fixedly connected to the outer wall of the permanent magnet 40, and the cross-section of the sealing ring corresponds to the first water spraying hole 42 and the second water spraying hole 43. During operation, when the flushing water pipe 29 extends into the reverse flow dividing pipe 6, the electromagnet 41 close to the fitting 34 is energized, so that the permanent magnet 40 fits with it under the magnetic attraction effect to complete the plugging of the third water spraying hole 44. When the flushing water pipe 29 slides out of the reverse flow dividing pipe 6, the electromagnet 41 far from the fitting 34 is energized, so that the permanent magnet 40 fits with it under the magnetic attraction effect to complete the plugging of the second water spraying hole 43, thus facilitating the staff to further dredge the blockage in the reverse flow dividing pipe 6.

[0046] A plurality of annular sealing grooves are formed on the inner side surface of the installation ring 30, and annular sealing strips are uniformly fixed on the outer wall of the fitting 34, and the annular sealing strips correspond to the annular sealing grooves one by one; during operation, after the reverse shunt pipe 6 is dredged, the staff slides the flushing pipe 29 out of the reverse shunt pipe 6, so that the fitting 34 fits with the installation ring 30 again. Through the cooperation of the annular sealing strip on the fitting 34 and the annular sealing groove on the installation ring 30, the sealing performance between the two can be ensured, and it is avoided that the dilute medium leaks from the discharge pipe 11 when flowing through the reverse shunt pipe 6.

[0047] Working principle: During normal shunting and reverse shunting, the combined medium can be shunted into the dilute medium, and the dilute medium can also be reverse shunted into the combined medium. And when the reverse shunt pipe 6 is not blocked, the flow rate and pressure of the dilute medium are relatively small, so that it cannot be shunted directly from the anti-blocking pipe 9 through the decompression chamber 10. When the content of slime and other impurities attached to the inner wall of the reverse shunt pipe 6 increases, the reverse shunt pipe 6 will become more and more blocked, causing the dilute medium to accumulate continuously in the anti-blocking pipe 9 until it fills the decompression chamber 10 and contacts the sponge body 17 in the soft storage member 16. After the sponge body 17 is soaked, its weight increases, driving the sealing plate 15 away from the sealing ring 13, and at the same time stretching the first spring 14, and the first annular member 19 and the second annular member 20 slide out, thus facilitating the dilute medium to enter the upper anti-blocking pipe 9 from the through grooves on the first annular member 19 and the second annular member 20, and finally enter the combined medium barrel 7 to complete the reverse shunting. This effectively avoids the problem that when the reverse shunt pipe 6 is blocked, the dilute medium in the reverse shunt pipe 6 flows back due to the staff's failure to react in time, resulting in too high density or too low liquid level of the suspension in the combined medium barrel 7. When the reverse shunt pipe 6 is blocked, the dilute medium can still enter the combined medium barrel 7 to complete the reverse shunting process, solving the situation of too high density or too low liquid level of the suspension in the combined medium barrel 7. When the staff completes the dredging of the reverse shunt pipe 6, the dilute medium will return to the reverse shunt pipe 6 again and no longer pass through the anti-blocking pipe 9. At this time, the liquid level in the anti-blocking pipe 9 drops, and the sponge body 17 gradually dehydrates, so that the sealing plate 15 fits with the sealing ring 13 again under the elastic force of the first spring 14 to complete the sealing, facilitating the continued use when the reverse shunt pipe 6 is blocked next time. When the reverse shunt pipe 6 is blocked and the flow rate of the dilute medium needs to be adjusted to control the density of the suspension in the combined medium barrel 7, the staff rotates the driving shaft 21, and the sleeve shaft 23 rotates accordingly under the action of the coupling 22, so that the telescopic shaft 24 drives the pressing plate 18 and the sealing plate 15 to rotate. And due to the limiting effect between the limiting block one and the limiting groove one on the first annular member 19, the second annular member 20 rotates relative to the first annular member 19. At this time, the through grooves on the first annular member 19 and the second annular member 20 are misaligned, reducing the flow rate of the dilute medium. By controlling the rotation angle of the driving shaft 21, the purpose of adjusting the flow rate of the dilute medium to control the density and liquid level of the suspension in the combined medium barrel 7 can be achieved. The limiting effect between the limiting block two and the limiting groove two enables the sleeve shaft 23 to drive the telescopic shaft 24 to rotate together. The second spring 25 provided in the sleeve shaft 23 can not only strengthen the fitting effect between the sealing plate 15 and the sealing ring 13 when the reverse shunt pipe 6 is not blocked, but also give an upward force to the pressing plate 18 when the sponge body 17 dehydrates after the reverse shunt pipe 6 is dredged, so that the pressing plate 18 squeezes the sponge body 17 in the soft storage member 16, accelerating the dehydration process of the sponge body 17. When the reverse shunt pipe 6 is blocked and the dilute medium passes through the anti-blocking pipe 9, the liquid level gauge on the anti-blocking pipe 9 senses and feeds back to warn the staff, and the staff can close the butterfly valves at both ends of the reverse shunt pipe 6 and open the second drain pipe 12.The fitting 34 is extruded from the mounting ring 30. Since the flushing water pipe 29 is a hose with a certain hardness, the flushing water pipe 29 is unreeled to make the fitting 34 extend into the anti-shunt pipe 6. At this time, water is passed into the flushing water pipe 29 through an external water pump. The valve on the first connecting pipe 35 is opened, and the valve on the second connecting pipe 36 is closed. At this time, the water in the flushing water pipe 29 is sprayed out through one of the nozzles 37 on the power member 31 to impact a group of arc-shaped power plates 38, causing the rotating shaft 39 to rotate in one direction, and then causing the water spraying member 33 to rotate accordingly. At the same time, the electromagnet 41 on the side close to the fitting 34 is energized, so that the permanent magnet 40 fits with it under the magnetic attraction, completing the blockage of the third water spraying hole 44. The water flows through the power member 31 and the water storage member 32 and is sprayed out from the first water spraying hole 42 and the second water spraying hole 43 on the water spraying member 33 to form an impact water surface to impact the inner cavity of the anti-shunt pipe 6, so that the blocked coal slime and other impurities in the anti-shunt pipe 6 are flushed away and discharged from the first discharge pipe 11 and the second discharge pipe 12, completing the dredging of the anti-shunt pipe 6, and at the same time not affecting the flow of the dilute medium 1 in the anti-blocking pipe 9. When the flushing water pipe 29 slides out of the anti-shunt pipe 6, the valve on the second connecting pipe 36 is opened, and the valve on the first connecting pipe 35 is closed, so that the other nozzle 37 starts to impact another group of arc-shaped power plates 38 with the opposite direction, and then causes the water spraying member 33 to rotate in the reverse direction. At the same time, the electromagnet 41 on the side far from the fitting 34 is energized, so that the permanent magnet 40 fits with it under the magnetic attraction, completing the blockage of the second water spraying hole 43. Then the water is sprayed out from the first water spraying hole 42 and the third water spraying hole 44 to form an impact water surface with the opposite impact direction when sliding in to impact the inner cavity of the anti-shunt pipe 6, improving the dredging effect.

[0048] The above front, back, left, right, up, and down are all based on the Figure 1 in the attached drawings of the specification. Taking the perspective of the observer as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present invention.

[0050] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An anti-shunt device for density control in heavy medium coal preparation, characterized in that: It includes a medium-removing screen (45), and the medium-removing screen (45) is divided into a dilute-medium section (1) and a combined-medium section (2). The dilute-medium section (1) is fixedly connected to the main pipe one (3), the other end of the main pipe one (3) is communicated with a dilute-medium barrel (8), the combined-medium section (2) is fixedly connected to the main pipe two (4), the other end of the main pipe two (4) is communicated with a combined-medium barrel (7), the upper part of the main pipe two (4) is fixedly connected to one end of a shunt branch pipe (5), the other end of the shunt branch pipe (5) is fixedly connected to the lower part of the main pipe one (3), the upper part of the main pipe one (3) is fixedly connected to one end of a reverse shunt pipe (6), the other end of the reverse shunt pipe (6) is communicated with the combined-medium barrel (7). A clogging prevention pipe (9) is fixedly connected to the top on one side of the reverse shunt pipe (6) close to the main pipe one (3), the other end of the clogging prevention pipe (9) is communicated with the combined-medium barrel (7), a pressure reduction cavity (10) is arranged at one end of the clogging prevention pipe (9) connected to the reverse shunt pipe (6), the pressure reduction cavity (10) is in a funnel shape after the two ends are combined, a sealing ring (13) is fixed on the inner wall of the clogging prevention pipe (9) above the pressure reduction cavity (10), a limiting cavity one is arranged in the sealing ring (13), a telescopic assembly is slidably connected in the limiting cavity one, the bottom end of the telescopic assembly penetrates through the sealing ring (13) and is connected with a sealing plate (15), a spring one (14) is arranged between the limiting cavity one and the telescopic assembly, a soft storage member (16) is fixedly connected to the bottom end of the sealing plate (15), a sponge body (17) is arranged in the inner cavity of the soft storage member (16), and through holes are uniformly arranged on the side wall of the soft storage member (16). Butterfly valves are installed at both ends of the reverse shunt pipe (6); The telescopic assembly includes an annular member one (19) and an annular member two (20). A limiting groove one is opened on the inner wall of the limiting cavity one, a limiting block one is slidably connected in the limiting groove one, the limiting block one is fixedly connected to the annular member one (19), the two ends of the spring one (14) are respectively fixedly connected to the annular member one (19) and the inner wall of the limiting cavity one. A limiting cavity two is arranged in the annular member one (19), an annular member two (20) is rotatably connected in the limiting cavity two, the bottom end of the annular member two (20) penetrates through the annular member one (19) and is fixedly connected to the sealing plate (15), the bottom end of the annular member one (19) penetrates through the sealing ring (13) and fits with the top of the sealing plate (15). Through grooves are opened on both the annular member one (19) and the annular member two (20). A pressing plate (18) is fixedly connected to the bottom end of the soft storage member (16). A rotating assembly is arranged in the pressure reduction cavity (10), the rotating assembly extends outside the pressure reduction cavity (10), and the bottom end of the pressing plate (18) is connected to the rotating assembly; The rotating assembly comprises a driving shaft (21), a coupling (22), a sleeve shaft (23) and a telescopic shaft (24); the coupling (22) is provided in the decompression chamber (10); the driving shaft (21) is rotatably connected to the lower part of the outer wall of the decompression chamber (10); one end of the driving shaft (21) extends into the decompression chamber (10) and is rotatably connected to the sleeve shaft (23) through the coupling (22); the telescopic shaft (24) is slidably connected in the sleeve shaft (23); the top end of the telescopic shaft (24) is fixedly connected to the bottom end of the pressure plate (18).

2. The reverse shunt device for heavy medium coal separation density control according to claim 1, characterized in that: Two limit grooves are provided on both sides of the inner cavity of the sleeve shaft (23), and two limit blocks are slidably connected in the two limit grooves. The two limit blocks are fixedly connected to the bottom of the telescopic shaft (24). A second spring (25) is fixedly connected to the bottom of the inner cavity of the sleeve shaft (23), and the top end of the second spring (25) is fixedly connected to the bottom end of the telescopic shaft (24).

3. The reverse shunt device for heavy medium coal separation density control according to claim 2, characterized in that: One end of the driving shaft (21) away from the coupling (22) extends to the outside of the decompression chamber (10) and is sleeved with a rotating wheel (26); elastic clamping balls (27) are evenly fixed to the inside of the rotating wheel (26); a fixing ring (28) is fixed to the outer wall of the decompression chamber (10); a hemispherical groove is formed on the outer side of the fixing ring (28); the elastic clamping ball (27) fits in the hemispherical groove; and the driving shaft (21) passes through the fixing ring (28).

4. The anti-shunt device for heavy medium coal separation density control according to claim 3, characterized in that: A liquid level gauge is installed on the wall of the anti-blocking pipe (9); a drainage pipe (11) is fixedly connected to the bottom of one side of the reverse diversion pipe (6) close to the main pipe (3); a mounting ring (30) is fixedly connected to the inner wall of the end of the drainage pipe (11); the inner side surface of the mounting ring (30) is funnel-shaped; a flushing pipe (29) passes through the center of the mounting ring (30); one end of the flushing pipe (29) is externally connected to a water pump; the inner side end of the flushing pipe (29) extends into the inner cavity of the reverse diversion pipe (6) and is fixedly connected to a power component (31); a water storage component (32), a water spray component (33) and an assembly component (34) are sequentially provided on the side of the power component (31) away from the flushing pipe (29); the water storage component (32) and the power component (31) are fixedly connected. The bottom of the side wall of the power member (31) is connected to the water storage member (32) through a plurality of conical connection holes. A sealing ring is rotatably connected to the water storage member (32). A hollow tube is evenly fixed to the sealing ring. Two ends of the hollow tube are respectively connected to the water storage member (32) and the water spray member (33). The outer wall of the water spray member (33) is evenly provided with water spray holes (42). The water spray holes (42) are distributed in an annular shape. The assembly member (34) corresponds to the mounting ring (30). A discharge pipe (12) is fixed to the bottom of one side of the reverse diversion pipe (6) close to the combined barrel (7). An end cap is threadedly connected to the discharge pipe (12). The discharge pipe (11) and the discharge pipe (12) form an "eight" shape.

5. The anti-shunt device for heavy medium coal separation density control according to claim 4, characterized in that: On the inner side ends of the flushing water pipe (29), a first connecting pipe (35) and a second connecting pipe (36) are symmetrically and fixedly connected. Valves are installed on both the first connecting pipe (35) and the second connecting pipe (36). In the inner cavity of the power component (31), two groups of arc-shaped power plates (38) are evenly arranged. And two spray nozzles (37) are symmetrically installed on the power component (31). The two spray nozzles (37) are respectively fixedly connected to the first connecting pipe (35) and the second connecting pipe (36). A rotating shaft (39) is fixed on the inner wall of the water spraying component (33). The other end of the rotating shaft (39) penetrates through the water storage component (32) and the power component (31) and is rotatably connected to the flushing water pipe (29). The two groups of arc-shaped power plates (38) are both sleeved on the rotating shaft (39), and the two groups of arc-shaped power plates (38) form an inverted "eight" shape.

6. The reverse shunt device for heavy medium coal separation density control according to claim 5, characterized in that: On both sides of the outer wall of the water spraying component (33), second water spraying holes (43) and third water spraying holes (44) are respectively and evenly arranged. The first water spraying hole (42) is located between the second water spraying hole (43) and the third water spraying hole (44). The first water spraying hole (42) and the second water spraying hole (43) are both inclined outward. And the first water spraying hole (42), the second water spraying hole (43) and the third water spraying hole (44) are all conical holes. An electromagnetic blocking assembly is arranged in the inner cavity of the water spraying component (33). The electromagnetic blocking assembly corresponds to the second water spraying hole (43) and the third water spraying hole (44).

7. The reverse shunt device for density control in heavy medium coal separation according to claim 6, characterized in that: The electromagnetic blocking assembly includes a permanent magnet (40) and an electromagnet (41). Electromagnets (41) are fixedly connected to both sides of the inner cavity of the power component (31). A permanent magnet (40) is arranged between the two electromagnets (41). The permanent magnet (40) is slidably connected to the inner cavity of the power component (31). The permanent magnet (40) and the electromagnet (41) are both annular and sleeved on the rotating shaft (39). A sealing ring is fixedly connected to the outer wall of the permanent magnet (40). The cross-section of the sealing ring corresponds to the first water spraying hole (42) and the second water spraying hole (43).

8. The anti-shunt device for density control in heavy medium coal separation according to claim 7, characterized in that: A plurality of annular sealing grooves are formed on the inner side surface of the mounting ring (30). Annular sealing strips are evenly fixedly connected to the outer wall of the fitting (34). The annular sealing strips correspond to the annular sealing grooves one by one.

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