Heavy liquid specific gravity detection device in coal automatic large floating and sinking experiment equipment

Abstract

The utility model relates to the technical field of heavy liquid specific gravity detection, in particular to a heavy liquid specific gravity detection device in coal automatic large floating and sinking experimental equipment, which comprises a support shell, a fixed frame, a support frame, a lifting mechanism, a laser range finder, a position adjusting mechanism, a limiting ring, a beaker, a glass tube density meter and a limiting mechanism, two fixing frames are fixedly arranged on the supporting shell, the supporting frame is fixedly arranged on one side of the supporting shell, the supporting frame extends into the fixing frames and is in sliding connection with the side walls of the fixing frames, the lifting mechanism is arranged on the supporting shell and used for adjusting the height of the supporting frame, and the laser range finder is arranged on the supporting frame in a sliding mode. The position adjusting mechanism is arranged between the laser range finder and the supporting frame and used for adjusting the position of the laser range finder, and through the technical scheme, the problem that in the related technology, the heavy liquid specific gravity detection accuracy is low is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heavy liquid specific gravity detection, in particular to a heavy liquid specific gravity detection device in automatic large-scale coal floating and sinking experimental equipment. Background Art

[0002] The coal automatic large floating and sinking test equipment is a device used for automatic floating and sinking tests on raw coal, clean coal, medium coal, gangue, etc. in the washing process of coal washing plants, so as to determine the density composition of the samples, understand the selectivity and washing indicators of the raw coal, and guide the online adjustment of production parameters.

[0003] The heavy liquid used in the automatic large-scale floating and sinking experiment of coal is lost and its density is reduced due to the coal sample being carried out. It is necessary to measure the density of the heavy liquid to ensure the accuracy of the floating and sinking test.

[0004] In the prior art, the density of the heavy liquid is measured by a glass tube density meter. During the measurement process, the glass tube density meter is placed in the heavy liquid and suspended on the liquid surface of the heavy liquid. The density of the heavy liquid can be obtained by reading the reading on the glass tube density meter corresponding to the liquid surface. However, after the glass tube density meter is placed in the heavy liquid, the glass tube density meter cannot be in a static state immediately. The glass tube density meter will move or shake in the heavy liquid, thereby affecting the accuracy of data reading. Utility Model Content

[0005] The utility model provides a heavy liquid specific gravity detection device in coal automatic large floating and sinking experimental equipment, which solves the problem of low accuracy in heavy liquid specific gravity detection in the related technology.

[0006] The technical scheme of the utility model is as follows: A device for detecting specific gravity of heavy liquid in automatic large floating and sinking experimental equipment for coal comprises a supporting shell, a fixed frame, a supporting frame, a lifting mechanism, a laser rangefinder, a position adjustment mechanism, a limiting ring, a beaker, a glass tube density meter and a limiting mechanism;

[0007] Two of the fixing frames are fixedly arranged on the supporting shell;

[0008] The support frame is fixedly arranged on one side of the support shell, and the support frame extends into the fixed frame and is slidably connected to the side wall of the fixed frame;

[0009] The lifting mechanism is arranged on the supporting shell and is used to adjust the height of the supporting frame;

[0010] The laser rangefinder is slidably arranged on the support frame;

[0011] The position adjustment mechanism is arranged between the laser rangefinder and the support frame, and is used to adjust the position of the laser rangefinder;

[0012] The limiting ring is arranged on one side of the supporting frame, and a supporting plate is fixedly arranged between the side wall of the limiting ring and the supporting frame;

[0013] The beaker is placed on the supporting shell;

[0014] The glass tube density meter is arranged in the beaker;

[0015] The limiting mechanism is arranged in the limiting ring and is used to limit the position of the glass tube density meter.

[0016] Preferably, the position adjustment mechanism comprises:

[0017] An adjustment slot, wherein the adjustment slot is provided on the support frame;

[0018] An adjusting block, the adjusting block being slidably disposed in the adjusting slot;

[0019] Wherein, the adjustment block is fixedly connected to the laser rangefinder;

[0020] a first threaded rod, the first threaded rod being rotatably disposed in the adjusting slot, and the first threaded rod penetrating the adjusting block through threaded engagement;

[0021] A first motor is fixedly disposed on the support frame, and an output end of the first motor is fixedly connected to the first threaded rod.

[0022] Furthermore, the limiting mechanism includes:

[0023] Limiting grooves, a plurality of the limiting grooves are provided on the inner wall of the limiting ring;

[0024] A limit block, wherein the limit block is arranged in the limit groove;

[0025] A limiting plate, two of which are hingedly provided between the limiting block and the bottom of the limiting groove;

[0026] An angle adjustment mechanism is arranged in the limiting ring and is used to adjust the angle of the limiting plate.

[0027] Furthermore, the angle adjustment mechanism includes:

[0028] A first cavity, wherein the first cavity is disposed in the limiting ring, the first cavity is configured as a ring, and the first cavity is communicated with the limiting groove;

[0029] an adjusting ring, the adjusting ring being slidably disposed in the first cavity;

[0030] An adjusting rod, the adjusting rod being hingedly arranged between the adjusting ring and the adjacent limiting plate;

[0031] A lifting mechanism is arranged in the limiting ring and is used to adjust the height of the adjusting ring.

[0032] Furthermore, the lifting mechanism comprises:

[0033] A second cavity, the second cavity is configured as a ring, and the second cavity is opened on one side of the limiting groove;

[0034] A lifting opening, wherein a plurality of the lifting openings are provided on the side wall of the second cavity, and the lifting openings are connected to the first cavity;

[0035] Internally threaded tubes, a plurality of internally threaded tubes are rotatably disposed in the second cavity, and the internally threaded tubes correspond one to one to the lifting ports;

[0036] A second threaded rod, a plurality of the second threaded rods are fixedly disposed on the adjusting ring, the second threaded rods penetrate the lifting port, and the second threaded rods penetrate the internal threaded tube by threaded engagement;

[0037] A synchronous rotation mechanism is arranged in the second cavity and is used to control the multiple internally threaded tubes to rotate synchronously.

[0038] On the basis of the above scheme, the synchronous rotation mechanism comprises:

[0039] A first gear, wherein a mounting opening is formed on the first gear, and the first gear is fixedly arranged on the outer wall of the internally threaded tube through the mounting opening;

[0040] a first gear ring, the first gear being rotatably disposed in the second cavity, the first gear being meshed with the first gear;

[0041] A power input mechanism is arranged on the limiting ring and is used to control the first gear ring to rotate.

[0042] On the basis of the above solution, the power input mechanism comprises:

[0043] a second gear, the second gear being rotatably disposed in the second cavity, and the second gear being meshed with the first gear ring;

[0044] The second motor is fixedly arranged on the limiting ring, and the output end of the second motor is fixedly connected to the second gear.

[0045] Based on the above solution, an arc-shaped limiting through groove is provided on the side wall of the limiting block.

[0046] On the basis of the above scheme, the lifting mechanism comprises:

[0047] A lifting threaded hole, wherein two lifting threaded rods are provided on the support frame, and the lifting threaded rods correspond to the fixed frame one by one;

[0048] A third threaded rod, two of which are rotatably provided on the support shell, and the third threaded rods extend into the lifting threaded hole through threaded engagement;

[0049] A driving mechanism is disposed in the supporting shell and is used to control the two third threaded rods to rotate synchronously.

[0050] On the basis of the above scheme, the driving mechanism comprises:

[0051] A worm gear, two of which are rotatably arranged in the support housing, and the worm gear is fixedly connected to the third threaded rod;

[0052] A worm, the worm being rotatably disposed in the support housing and meshing with the worm wheel;

[0053] A third motor is fixedly arranged on the supporting shell, and an output end of the third motor is fixedly connected to the worm.

[0054] The working principle and beneficial effects of the utility model are:

[0055] 1. In the utility model, through the setting of the position adjustment mechanism, the first motor can be used to control the first threaded rod to rotate, and the threaded cooperation between the first threaded rod and the adjustment block drives the adjustment block and the laser rangefinder to adjust the position, so that the liquid level and the height of the glass tube density meter can be measured by the laser rangefinder, and then the height difference between the liquid level and the height of the glass tube density meter minus the minimum readable scale distance calibrated by the glass tube density meter can be converted to the reading corresponding to the glass tube density meter relative to the liquid level, so as to obtain the specific gravity value of the liquid level;

[0056] 2. In the utility model, the setting of the limiting mechanism facilitates the angle adjustment of the limiting plate by the angle adjustment mechanism, and at the same time, the limiting plate drives the limiting block to approach the glass tube density meter, so that the glass tube density meter can be limited, thereby preventing the glass tube density meter from moving and affecting the height measurement and measurement accuracy of the glass tube density meter by the laser rangefinder;

[0057] 3. In the utility model, through the setting of the lifting mechanism, the operation of the third motor can drive the worm to rotate, and the meshing of the worm and the worm wheel can drive the third threaded rod to rotate, and then the threaded cooperation between the threaded rod and the lifting threaded hole drives the height of the support frame and the limit ring to be adjusted, so that the limit ring is located above the liquid surface and limits the glass tube density meter;

[0058] 4. In the utility model, by arranging the supporting shell, the fixed frame, the supporting frame, the lifting mechanism, the laser rangefinder, the position adjustment mechanism, the limiting ring, the beaker, the glass tube density meter and the limiting mechanism, it is convenient to limit the glass tube density meter through the limiting mechanism, and at the same time, the liquid level and the height of the glass tube density meter can be measured respectively through the movement of the laser rangefinder, and then the height difference between the liquid level and the height of the glass tube density meter minus the minimum readable scale distance calibrated by the glass tube density meter can be subtracted, so that the reading corresponding to the glass tube density meter relative to the liquid level can be converted, so as to obtain the specific gravity value of the liquid level, thereby solving the problem of low accuracy in the detection of specific gravity of heavy liquid in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0060] Figure 1 It is a schematic diagram of the structure of the utility model;

[0061] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0062] Figure 3 This is a schematic cross-sectional view of the driving mechanism of the utility model;

[0063] Figure 4 This is a schematic diagram of the cross-sectional structure of the limit ring of the utility model;

[0064] Figure 5 It is a schematic diagram of the structure of the limiting mechanism of the utility model.

[0065] In the figure: 1. support shell; 2. fixed frame; 3. support frame; 4. laser rangefinder; 5. limit ring; 6. beaker; 7. glass tube density meter; 8. adjustment block; 9. first threaded rod; 10. first motor; 11. limit groove; 12. limit block; 13. limit plate; 14. first cavity; 15. adjustment ring; 16. adjustment rod; 17. internal threaded tube; 18. second threaded rod; 19. first gear; 20. first gear ring; 21. second gear; 22. second motor; 23. third threaded rod; 24. worm gear; 25. worm; 26. third motor. DETAILED DESCRIPTION

[0066] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0067] like Figure 1-Figure 5 As shown, this embodiment proposes a heavy liquid specific gravity detection device in a coal automatic large floating and sinking experimental equipment, including a support shell 1, a fixed frame 2, a support frame 3, a lifting mechanism, a laser rangefinder 4, a position adjustment mechanism, a limit ring 5, a beaker 6, a glass tube density meter 7 and a limit mechanism. Two fixed frames 2 are fixedly arranged on the support shell 1, and the support frame 3 is fixedly arranged on one side of the support shell 1. The support frame 3 extends into the fixed frame 2 and is slidably connected to the side wall of the fixed frame 2. The lifting mechanism is arranged on the support shell 1 for adjusting the height of the support frame 3, the laser rangefinder 4 is slidably arranged on the support frame 3, the position adjustment mechanism is arranged between the laser rangefinder 4 and the support frame 3, and is used to adjust the position of the laser rangefinder 4. The limit ring 5 is arranged on one side of the support frame 3, and a support plate is fixedly arranged between the side wall of the limit ring 5 and the support frame 3. The beaker 6 is placed on the support shell 1, the glass tube density meter 7 is arranged in the beaker 6, and the limit mechanism is arranged in the limit ring 5 for limiting the position of the glass tube density meter 7.

[0068] Reference Figure 1 and Figure 2 The position adjustment mechanism includes an adjustment groove, an adjustment block 8, a first threaded rod 9 and a first motor 10. The adjustment groove is opened on the support frame 3, and the adjustment block 8 is slidably set in the adjustment groove, wherein the adjustment block 8 is fixedly connected to the laser rangefinder 4, the first threaded rod 9 is rotatably set in the adjustment groove, the first threaded rod 9 penetrates the adjustment block 8 through threaded cooperation, the first motor 10 is fixedly set on the support frame 3, and the output end of the first motor 10 is fixedly connected to the first threaded rod 9.

[0069] Specifically, the operator adds heavy liquid to the beaker 6 and places the beaker 6 on the supporting shell 1. Then, the operator puts the glass tube density meter 7 through the limiting ring 5 and into the beaker 6. Then, after the glass tube is stable, the operator controls the first motor 10 to work. The operation of the first motor 10 can control the first threaded rod 9 to rotate. At the same time, the adjustment block 8 and the laser rangefinder 4 are driven to adjust the position through the thread cooperation between the first threaded rod 9 and the adjustment block 8, so that the liquid level height and the height of the glass tube density meter 7 can be measured respectively by the laser rangefinder 4. Then, the height difference between the liquid level height and the height of the glass tube density meter 7 is subtracted from the minimum readable scale distance calibrated by the glass tube density meter 7, so that it can be converted to the indication corresponding to the glass tube density meter 7 relative to the liquid level, thereby obtaining the specific gravity value of the liquid level.

[0070] Reference Figure 4 and Figure 5The limiting mechanism includes a limiting groove 11, a limiting block 12, a limiting plate 13 and an angle adjustment mechanism. The inner wall of the limiting ring 5 is provided with a plurality of limiting grooves 11, the limiting block 12 is arranged in the limiting groove 11, and two limiting plates 13 are hingedly arranged between the limiting block 12 and the groove bottom of the limiting groove 11. The angle adjustment mechanism is arranged in the limiting ring 5 for adjusting the angle of the limiting plate 13. The angle adjustment mechanism includes a first cavity 14, an adjustment ring 15, an adjustment rod 16 and a lifting mechanism. The first cavity 14 is arranged in the limiting ring 5, and the first cavity 14 is arranged in an annular shape. The first cavity 14 is connected to the limiting groove 11, the adjusting ring 15 is slidably arranged in the first cavity 14, the adjusting rod 16 is hingedly arranged between the adjusting ring 15 and the adjacent limiting plate 13, the lifting mechanism is arranged in the limiting ring 5, and is used to adjust the height of the adjusting ring 15, the lifting mechanism includes a second cavity, a lifting port, an internal threaded tube 17, a second threaded rod 18 and a synchronous rotation mechanism, the second cavity is arranged in an annular shape, the second cavity is opened on one side of the limiting groove 11, and a plurality of lifting ports are opened on the side wall of the second cavity, the lifting ports are connected to the first cavity 14, and the second cavity A plurality of internally threaded tubes 17 are provided for rotation in the cavity, and the internally threaded tubes 17 correspond to the lifting ports one by one. A plurality of second threaded rods 18 are fixedly provided on the adjusting ring 15, and the second threaded rods 18 penetrate the lifting ports. The second threaded rods 18 penetrate the internally threaded tubes 17 through threaded cooperation. A synchronous rotation mechanism is provided in the second cavity for controlling the synchronous rotation of the plurality of internally threaded tubes 17. The synchronous rotation mechanism comprises a first gear 19, a first gear ring 20 and a power input mechanism. A mounting port is provided on the first gear 19, and the first gear 19 is fixedly provided on the internally threaded tubes 19 through the mounting port. On the outer wall of the tube 17, the first gear 19 is rotatably arranged in the second cavity, the first gear 19 is meshed with the first gear 19, the power input mechanism is arranged on the limit ring 5, and is used to control the first gear ring 20 to rotate. The power input mechanism includes a second gear 21 and a second motor 22. The second gear 21 is rotatably arranged in the second cavity, the second gear 21 is meshed with the first gear ring 20, the second motor 22 is fixedly arranged on the limit ring 5, and the output end of the second motor 22 is fixedly connected to the second gear 21. An arc-shaped limit groove is provided on the side wall of the limit block 12.

[0071] Specifically, after the operator places the glass tube density meter 7 through the limit ring 5 and into the beaker 6, the operator controls the second motor 22 to work. The work of the second motor 22 can control the second gear 21 to rotate, and at the same time, the meshing of the second gear 21 with the first gear ring 20 drives the first gear ring 20 to rotate, so that the meshing of the first gear ring 20 with the first gear 19 can control the internal threaded tube 17 to rotate, and at the same time, the threaded cooperation between the internal threaded tube 17 and the second threaded rod 18 can drive the second threaded rod 18 and the adjusting ring 15 to rise and fall. In the process of height adjustment of the adjusting ring 15, the limit plate 13 can be pulled by the adjusting rod 16 for angle adjustment, and at the same time, the change of the angle of the limit plate 13 drives the limit block 12 to approach the glass tube density meter 7, and then the cooperation between the limit blocks 12 limits the glass tube density meter 7, thereby preventing the glass tube density meter 7 from moving and affecting the height measurement and measurement accuracy of the glass tube density meter 7 by the laser rangefinder 4.

[0072] Reference Figure 3 The lifting mechanism includes a lifting threaded hole, a third threaded rod 23 and a driving mechanism. Two lifting threaded rods are provided on the support frame 3, and the lifting threaded rods correspond to the fixed frame 2 one by one. Two third threaded rods 23 are rotatably provided on the support shell 1, and the third threaded rods 23 extend into the lifting threaded hole through threaded cooperation. The driving mechanism is arranged in the support shell 1, and is used to control the two third threaded rods 23 to rotate synchronously. The driving mechanism includes a worm gear 24, a worm 25 and a third motor 26. Two worm gears 24 are rotatably provided in the support shell 1, and the worm gear 24 is fixedly connected to the third threaded rod 23. The worm 25 is rotatably provided in the support shell 1, and the worm 25 is meshed with the worm gear 24. The third motor 26 is fixedly provided on the support shell 1, and the output end of the third motor 26 is fixedly connected to the worm 25.

[0073] Specifically, the operator controls the operation of the third motor 26, and the operation of the third motor 26 can drive the worm 25 to rotate, and at the same time drive the third threaded rod 23 to rotate through the engagement of the worm 25 and the worm wheel 24, and then drive the height of the support frame 3 and the limit ring 5 to be adjusted through the threaded cooperation between the threaded rod and the lifting threaded hole, so that the limit ring 5 is located above the liquid surface and limits the glass tube density meter 7.

[0074] In the present embodiment, when in use, the operator adds heavy liquid to the beaker 6 and then places the beaker 6 on the support shell 1, and then the operator controls the third motor 26 to work, and the work of the third motor 26 can drive the worm 25 to rotate, and at the same time, the meshing of the worm 25 and the worm wheel 24 drives the third threaded rod 23 to rotate, and then the threaded cooperation between the threaded rod and the lifting threaded hole drives the height of the support frame 3 and the limit ring 5 to be adjusted, so that the limit ring 5 is located above the liquid surface, and then the operator puts the glass tube density meter 7 through the limit ring 5 into the beaker 6 and controls the second motor 22 to work, and the work of the second motor 22 can control the second gear 21 to rotate, and at the same time, the meshing of the second gear 21 and the first gear ring 20 drives the first gear ring 20 to rotate, so that the meshing of the first gear ring 20 and the first gear 19 can control the rotation of the internal threaded tube 17, and at the same time, the threaded cooperation between the internal threaded tube 17 and the second threaded rod 18 can drive the second threaded rod 18 and the adjusting ring 15 to be lifted and lowered, and the adjusting ring 1 During the height adjustment, the limiting plate 13 can be pulled by the adjusting rod 16 to adjust the angle, and the limiting block 12 is driven to approach the glass tube density meter 7 by the change of the angle of the limiting plate 13, and then the glass tube density meter 7 is limited by the cooperation between the limiting blocks 12, so as to prevent the glass tube density meter 7 from moving and affecting the height measurement and measurement accuracy of the glass tube density meter 7 by the laser rangefinder 4. After that, the first motor 10 is controlled to work after the glass tube is stable. The work of the first motor 10 can control the first threaded rod 9 to rotate, and the adjusting block 8 and the laser rangefinder 4 are driven to adjust the position by the thread cooperation between the first threaded rod 9 and the adjusting block 8, so that the liquid level and the height of the glass tube density meter 7 can be measured by the laser rangefinder 4, respectively. After that, the height difference between the liquid level and the height of the glass tube density meter 7 is subtracted from the minimum readable scale distance calibrated by the glass tube density meter 7, so as to convert the reading corresponding to the glass tube density meter 7 relative to the liquid level, and thus obtain the specific gravity value of the liquid level.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The heavy liquid specific gravity detection device in the coal automatic large floating and sinking test equipment is characterized by: include: A supporting shell (1); A fixed frame (2), two of the fixed frames (2) being fixedly arranged on the supporting shell (1); A support frame (3), the support frame (3) being fixedly arranged on one side of the support shell (1), the support frame (3) extending into the fixed frame (2) and being slidably connected to a side wall of the fixed frame (2); A lifting mechanism, the lifting mechanism being arranged on the supporting shell (1) and being used for adjusting the height of the supporting frame (3); A laser rangefinder (4), the laser rangefinder (4) being slidably disposed on the support frame (3); A position adjustment mechanism, the position adjustment mechanism being arranged between the laser rangefinder (4) and the support frame (3) and being used for adjusting the position of the laser rangefinder (4); A limiting ring (5), the limiting ring (5) being arranged on one side of the supporting frame (3), and a supporting plate being fixedly arranged between a side wall of the limiting ring (5) and the supporting frame (3); A beaker (6), the beaker (6) being placed on the supporting shell (1); A glass tube density meter (7), wherein the glass tube density meter (7) is arranged in the beaker (6); A limiting mechanism, the limiting mechanism is arranged in the limiting ring (5) and is used to limit the position of the glass tube density meter (7).

2. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 1 is characterized in that: The position adjustment mechanism comprises: An adjustment groove, the adjustment groove being provided on the support frame (3); An adjustment block (8), the adjustment block (8) being slidably disposed in the adjustment slot; Wherein, the adjustment block (8) is fixedly connected to the laser rangefinder (4); a first threaded rod (9), the first threaded rod (9) being rotatably disposed in the adjustment groove, the first threaded rod (9) penetrating the adjustment block (8) by means of threaded engagement; A first motor (10), wherein the first motor (10) is fixedly arranged on the support frame (3), and an output end of the first motor (10) is fixedly connected to the first threaded rod (9).

3. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 2 is characterized in that: The limiting mechanism comprises: Limiting grooves (11), a plurality of the limiting grooves (11) are provided on the inner wall of the limiting ring (5); A limit block (12), wherein the limit block (12) is arranged in the limit groove (11); A limiting plate (13), wherein two limiting plates (13) are hingedly provided between the limiting block (12) and the bottom of the limiting groove (11); An angle adjustment mechanism, the angle adjustment mechanism is arranged in the limiting ring (5) and is used to adjust the angle of the limiting plate (13).

4. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 3 is characterized in that: The angle adjustment mechanism comprises: a first cavity (14), the first cavity (14) being disposed in the limiting ring (5), the first cavity (14) being arranged in a ring shape, and the first cavity (14) being communicated with the limiting groove (11); an adjusting ring (15), the adjusting ring (15) being slidably disposed in the first cavity (14); An adjusting rod (16), the adjusting rod (16) being hingedly arranged between the adjusting ring (15) and the adjacent limiting plate (13); A lifting mechanism, the lifting mechanism is arranged in the limiting ring (5) and is used to adjust the height of the adjustment ring (15).

5. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 4 is characterized in that: The lifting mechanism comprises: A second cavity, the second cavity being arranged in an annular shape and being opened on one side of the limiting groove (11); A lifting opening, wherein a plurality of the lifting openings are provided on the side wall of the second cavity, and the lifting openings are connected to the first cavity (14); An internally threaded tube (17), wherein a plurality of the internally threaded tubes (17) are rotatably arranged in the second cavity, and the internally threaded tubes (17) correspond one-to-one to the lifting openings; a second threaded rod (18), a plurality of the second threaded rods (18) being fixedly arranged on the adjusting ring (15), the second threaded rods (18) passing through the lifting opening, and the second threaded rods (18) passing through the internal threaded tube (17) by means of threaded engagement; A synchronous rotation mechanism, the synchronous rotation mechanism is arranged in the second cavity and is used to control the multiple internally threaded tubes (17) to rotate synchronously.

6. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 5 is characterized in that: The synchronous rotation mechanism comprises: A first gear (19), wherein a mounting opening is provided on the first gear (19), and the first gear (19) is fixedly arranged on the outer wall of the internally threaded tube (17) through the mounting opening; a first gear ring (20), the first gear (19) being rotatably disposed in the second cavity, the first gear (19) being meshed with the first gear (19); A power input mechanism, the power input mechanism is arranged on the limiting ring (5) and is used to control the first gear ring (20) to rotate.

7. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 6 is characterized in that: The power input mechanism comprises: a second gear (21), the second gear (21) being rotatably disposed in the second cavity, the second gear (21) being meshed with the first gear ring (20); A second motor (22), the second motor (22) is fixedly arranged on the limiting ring (5), and an output end of the second motor (22) is fixedly connected to the second gear (21).

8. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 7 is characterized in that: An arc-shaped limiting through groove is provided on the side wall of the limiting block (12).

9. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 8, characterized in that: The lifting mechanism comprises: A lifting threaded hole, wherein the support frame (3) is provided with two lifting threaded rods, and the lifting threaded rods correspond one to one with the fixed frame (2); A third threaded rod (23), wherein two third threaded rods (23) are rotatably provided on the support shell (1), and the third threaded rods (23) extend into the lifting threaded hole through threaded engagement; A driving mechanism, the driving mechanism is arranged in the supporting shell (1) and is used to control the two third threaded rods (23) to rotate synchronously.

10. The device for detecting specific gravity of heavy liquid in the automatic large floating and sinking test equipment for coal according to claim 9, characterized in that: The driving mechanism comprises: A worm wheel (24), two worm wheels (24) are rotatably arranged in the support housing (1), and the worm wheels (24) are fixedly connected to the third threaded rod (23); a worm (25), the worm (25) being rotatably disposed in the support housing (1), the worm (25) being meshed with the worm wheel (24); A third motor (26), the third motor (26) being fixedly arranged on the supporting housing (1), and an output end of the third motor (26) being fixedly connected to the worm (25).

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