A double half-bowl air cushion type mining material buffer device and its use method

Abstract

The invention discloses a double half-bowl air cushion type mining material buffer device and a use method thereof, comprising a primary buffer unit, a secondary buffer unit, a material receiving chute and a base fixing device, wherein the primary buffer unit comprises a primary material holding device, a primary pressure-bearing sleeve shaft, a primary basic main shaft, a primary sliding guide rod and a primary sliding rod sleeve, and the secondary buffer unit comprises a secondary material holding device, a secondary pressure-bearing sleeve shaft, a secondary basic main shaft, a secondary sliding guide rod and a secondary sliding rod sleeve, the primary material holding device and the secondary material holding device are both half-bowl-shaped mechanisms with a bottom support, the primary material holding device is welded to the primary pressure-bearing sleeve shaft as a whole, the primary pressure-bearing sleeve shaft is nested on the secondary basic main shaft to form a closed primary pressure-bearing cavity, and the secondary material holding device is welded to the secondary pressure-bearing sleeve shaft as a whole. The invention can achieve a multi-stage buffering effect, reduce the impact of materials on a storage bin at the bottom of a well, and achieve safe delivery of solid materials.

Description

Technical Field

[0001] The present invention relates to the technical field of mining material buffer devices, and is particularly suitable for buffering filling materials placed from the ground to a vertical pipeline underground in a coal mine, and specifically is a double half-bowl air cushion type mining material buffer device and a method of using the same. Background Art

[0002] At present, the solid filling mining technology of coal mines has realized the large-scale mining of "three-down" compressed coal, effectively improved the recovery rate of "three-down" compressed coal in the mine, and handled a large amount of solid waste such as gangue that has been accumulated on the ground for a long time. In the solid filling coal mining feeding system, solid materials such as gangue are generally thrown to the bottom of the well from a vertical position of tens to hundreds of meters from the bottom of the well. When the materials reach the bottom of the well, the speed is generally more than 50m / s. High-speed gangue and other materials have great impact and destructive power. If they are not buffered, they will cause great damage to the storage bin at the bottom of the well when they reach the bottom of the well, shortening the service life of the storage bin.

[0003] Therefore, in order to solve the above-mentioned solid filling coal mining feeding buffering problem, the present invention manufactures a double half-bowl air cushion type mining material buffering device, which can effectively buffer solid filling materials such as gangue and reduce damage to the storage bin. Summary of the invention

[0004] The object of the present invention is to provide a double half-bowl air cushion type mining material buffer device and a use method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double half-bowl air cushion type mining material buffer device, comprising a primary buffer unit, a secondary buffer unit, a material receiving chute and a base fixing device;

[0006] The primary buffer unit comprises a primary material holding device, a primary pressure bearing sleeve shaft, a primary basic main shaft, a primary sliding guide rod and a primary sliding rod sleeve;

[0007] The secondary buffer unit comprises a secondary material holding device, a secondary pressure-bearing sleeve shaft, a secondary basic main shaft, a secondary sliding guide rod and a secondary sliding rod sleeve;

[0008] The material receiving chute is inclined and arranged between the primary buffer unit and the secondary buffer unit, and the material receiving chute comprises a chute slide plate and a support column, and the support column is welded on the lower surface of the chute slide plate;

[0009] The base fixing device includes a primary base and a secondary base, and both the primary base and the secondary base are semicircular steel plate structures, and the primary base and the secondary base are respectively provided with primary sliding guide rod light holes adapted to the primary sliding guide rod and secondary sliding guide rod light holes adapted to the secondary sliding guide rod at their edge positions, and the primary base and the secondary base are respectively provided with support column light holes corresponding to and adapted to the support columns one by one;

[0010] The first-level material holding device is a semi-bowl-shaped mechanism with a bottom support, and the lower part of the first-level material holding device is welded to the first-level pressure-bearing sleeve shaft as a whole, the first-level pressure-bearing sleeve shaft is a cylindrical sleeve-shaped structure, the outer side wall of the first-level material holding device is fixed with a first-level sliding rod sleeve slidably connected to the first-level sliding guide rod, the first-level sliding guide rod is vertically inserted in the first-level sliding guide rod light hole, the first-level basic main shaft is a cylindrical columnar structure, and the outer diameter of the first-level basic main shaft is matched with the inner diameter of the first-level pressure-bearing sleeve shaft, the first-level pressure-bearing sleeve shaft is nested on the first-level basic main shaft and forms a closed first-level pressure-bearing cavity, the bottom end of the first-level basic main shaft is welded to the first-level base as a whole, and a first-level middle air guide pipeline connected to the first-level pressure-bearing cavity is opened at the central position of the first-level basic main shaft along its axial direction, the bottom end side wall of the first-level basic main shaft is connected with a first-level gas injection pipeline connected to the first-level middle gas guide pipeline, and a first-level filling and discharging switch is provided on the first-level gas injection pipeline;

[0011] The secondary material holding device is a semi-bowl-shaped mechanism with a bottom support, and the lower part of the secondary material holding device is welded to the secondary pressure-bearing sleeve shaft as a whole, the secondary pressure-bearing sleeve shaft is a cylindrical sleeve-shaped structure, the outer side wall of the secondary material holding device is fixed with a secondary sliding rod sleeve slidably connected to the secondary sliding guide rod, the secondary sliding guide rod is vertically inserted in the light hole of the secondary sliding guide rod, the secondary basic main shaft is a cylindrical columnar structure, and the outer diameter of the secondary basic main shaft is matched with the inner diameter of the secondary pressure-bearing sleeve shaft, the secondary pressure-bearing sleeve shaft is nested on the secondary basic main shaft and forms a closed secondary pressure-bearing cavity, the bottom end of the secondary basic main shaft is welded to the secondary base as a whole, and a secondary middle air guide pipeline connected to the secondary pressure-bearing cavity is opened at the central position of the secondary basic main shaft along its axial direction, the bottom end side wall of the secondary basic main shaft is connected with a secondary gas injection pipeline connected to the secondary middle gas guide pipeline, and a secondary gas charging and discharging switch is provided on the secondary gas injection pipeline;

[0012] The half-bowl-shaped structure of the primary material holding device is 300-500mm higher than the half-bowl-shaped structure of the secondary material holding device in the longitudinal direction, and the projections of the half-bowl-shaped structure of the primary material holding device and the half-bowl-shaped structure of the secondary material holding device in the horizontal direction overlap, and the overlapping area is 1 / 5-1 / 4 of the area of ​​the primary material holding device.

[0013] Furthermore, at least two parallel semicircular annular grooves are provided at the edge of the lower inner surface of the primary pressure-bearing sleeve shaft, and primary sealing rings with circular interfaces are installed in the annular grooves.

[0014] Furthermore, at least two parallel semicircular annular grooves 2 are provided at the edge of the lower portion of the inner surface of the secondary pressure-bearing sleeve shaft, and secondary sealing ring strips with circular interfaces are installed in the annular grooves 2.

[0015] Furthermore, mounting steel bars are welded to both side edges of the primary base and the secondary base, and the mounting steel bars are provided with mounting horizontal light holes, the positions of the mounting horizontal light holes on the primary base and the mounting horizontal light holes on the secondary base correspond one to one, and the primary base and the secondary base are connected as a whole through the cooperation of the mounting horizontal light holes, the base fastening bolts and the base fastening nuts.

[0016] Furthermore, the aperture of the installation horizontal light hole is 10-15 mm.

[0017] Furthermore, the length and width of the half-bowl-shaped mechanism of the primary material holding device are respectively 20-60 mm smaller than the length and width of the half-bowl-shaped mechanism of the secondary material holding device.

[0018] Furthermore, the angle between the chute slide and the upper surface of the base fixing device is 15-45°.

[0019] The method for using the above-mentioned double half-bowl air cushion type mining material buffer device comprises the following steps:

[0020] Step 1: Open the primary gas charging and discharging switch and the secondary gas charging and discharging switch respectively, and inject a certain amount of gas into the primary pressure-bearing cavity and the secondary gas charging and discharging switch through the primary gas injection pipeline and the secondary gas injection pipeline respectively, and then close the primary gas charging and discharging switch and the secondary gas charging and discharging switch;

[0021] Step 2: Place the entire device below the feeding pipe, and ensure that the upper port of the primary material holding device is aligned with the lower port of the feeding pipe, so that the filling material particles in the feeding pipe first enter the primary buffer unit to achieve primary buffering, and then enter the secondary buffer unit to achieve secondary buffering. The filling material particles after secondary buffering enter the chute slide;

[0022] Step 3: Park a transport device such as a mine car at the lower end of the chute slide, and the filling material particles enter the chute slide and slide down the chute slide to the transport device such as a mine car for loading.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) When the filling material particles in the feeding pipe fall into the primary material holding device, under the impact of the falling material, the gas in the primary pressure-bearing cavity in the primary buffer unit is compressed to absorb the kinetic energy of the filling material particles, thereby realizing primary buffering. Then, the filling material particles enter the secondary material holding device. Similarly, under the impact of the filling material particles, the gas in the secondary pressure-bearing cavity in the secondary buffer unit is compressed to absorb the kinetic energy of the filling material particles, thereby realizing secondary buffering. Then, the filling material particles enter the chute of the receiving chute, and then slide into the transport device such as the mine car, thereby greatly reducing the impact of the material on the bottom storage bin and realizing the safe delivery of solid materials.

[0025] (2) The first-level material holding device and the second-level material holding device will reset under the elastic action of the compressed gas and enter the next material receiving buffer cycle. This process is repeated as the material falls, thereby realizing multi-level buffering of the filling material particles thrown from the feeding pipe. The entire device is easy to use, safe and efficient, requires low investment, and has good practicality in underground filling mining.

[0026] In summary, the present invention is applied to the comprehensive mechanized solid material filling coal mining technology. When the surface material is put into the underground through the feeding pipeline, it passes through the primary buffer unit and the secondary buffer unit to achieve a multi-level buffer effect, which can greatly reduce the impact of the material on the bottom storage bin and achieve the safe delivery of solid materials. The whole device is easy to use, safe and efficient, with low investment, and has good practicality in underground filling mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a top view of the structure of the present invention;

[0029] Figure 3 It is a structural side view of the present invention;

[0030] Figure 4 It is a structural front view of the present invention;

[0031] Figure 5 It is a structural explosion diagram of the present invention;

[0032] Figure 6 It is a structural cross-sectional view of the present invention;

[0033] Figure 7 for Figure 6 Cross-section of EE;

[0034] Figure 8 for Figure 6 Cross-section of the middle FF;

[0035] Fig. 9It is a schematic diagram of the positional relationship between the present invention and the feeding pipe.

[0036] In the figure: 1. First-level material holding device; 2. Second-level material holding device; 3. First-level pressure-bearing sleeve shaft; 4. Second-level pressure-bearing sleeve shaft; 5. First-level basic spindle; 6. Second-level basic spindle; 7. First-level base; 8. Second-level base; 9. Base fastening bolts; 10. Base fastening nuts; 11. First-level sliding guide rod; 12. Second-level sliding guide rod; 13. First-level sliding rod sleeve; 14. Second-level sliding rod sleeve; 15. Chute slide; 16. First-level gas injection pipeline; 17 , first-level charging and discharging switch; 18, first-level sliding guide rod light hole; 19, support column light hole; 20, second-level sealing ring strip; 21, first-level sealing ring strip; 22, second-level middle air guide pipeline; 23, first-level middle air guide pipeline; 24, second-level pressure-bearing cavity; 25, first-level pressure-bearing cavity; 26, second-level gas injection pipeline; 27, second-level charging and discharging switch; 28, support column; 29, feeding pipe; 30, filling material particles; 31, second-level sliding guide rod light hole. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-9 , an embodiment provided by the present invention: a double half-bowl air cushion type mining material buffer device, comprising a primary buffer unit, a secondary buffer unit, a material receiving chute and a base fixing device;

[0039] The primary buffer unit comprises a primary material holding device 1, a primary pressure bearing sleeve shaft 3, a primary base spindle 5, a primary sliding guide rod 11 and a primary sliding rod sleeve 13;

[0040] The secondary buffer unit comprises a secondary material holding device 2, a secondary pressure bearing sleeve shaft 4, a secondary basic main shaft 6, a secondary sliding guide rod 12 and a secondary sliding rod sleeve 14;

[0041] The material receiving chute is inclined between the primary buffer unit and the secondary buffer unit, and the material receiving chute includes a chute slide plate 15 and a support column 28, and the support column 28 is welded on the lower surface of the chute slide plate 15;

[0042] The base fixing device includes a primary base 7 and a secondary base 8, and both the primary base 7 and the secondary base 8 are semicircular steel plate structures, and the primary base 7 and the secondary base 8 are respectively provided with a primary sliding guide rod light hole 18 adapted to the primary sliding guide rod 11 and a secondary sliding guide rod light hole 31 adapted to the secondary sliding guide rod 12 at their edges, and the primary base 7 and the secondary base 8 are respectively provided with a support column light hole 19 corresponding to and adapted to the support column 28 one by one;

[0043] The first-level material holding device 1 is a semi-bowl-shaped mechanism with a bottom bracket, and the lower part of the first-level material holding device 1 is welded to the first-level pressure-bearing sleeve shaft 3 as a whole. The first-level pressure-bearing sleeve shaft 3 is a cylindrical sleeve-shaped structure. The outer side wall of the first-level material holding device 1 is fixed with a first-level sliding rod sleeve 13 slidably connected to the first-level sliding guide rod 11. The first-level sliding guide rod 11 is vertically inserted in the first-level sliding guide rod light hole 18. The first-level basic spindle 5 is a cylindrical columnar structure, and the outer diameter of the first-level basic spindle 5 is the same as that of the first-level pressure-bearing sleeve shaft 3. The inner diameter of the primary pressure-bearing sleeve shaft 3 is matched, the primary pressure-bearing sleeve shaft 3 is nested on the primary basic main shaft 5 and forms a closed primary pressure-bearing cavity 25, the bottom end of the primary basic main shaft 5 is welded to the primary base 7 as a whole, and a primary middle air guide pipeline 23 connected to the primary pressure-bearing cavity 25 is opened along its axial direction at the central position of the primary basic main shaft 5, and the bottom end side wall of the primary basic main shaft 5 is connected to a primary gas injection pipeline 16 connected to the primary middle gas guide pipeline 23, and a primary gas filling and discharging switch 17 is provided on the primary gas injection pipeline 16;

[0044] The secondary material holding device 2 is a semi-bowl-shaped mechanism with a bottom bracket, and the lower part of the secondary material holding device 2 is welded to the secondary pressure-bearing sleeve shaft 4 as a whole, and the secondary pressure-bearing sleeve shaft 4 is a cylindrical sleeve-shaped structure. The outer side wall of the secondary material holding device 2 is fixed with a secondary sliding rod sleeve 14 slidably connected to the secondary sliding guide rod 12, and the secondary sliding guide rod 12 is vertically inserted in the secondary sliding guide rod light hole 31. The secondary basic spindle 6 is a cylindrical columnar structure, and the outer diameter of the secondary basic spindle 6 is the same as that of the secondary pressure-bearing sleeve shaft 4. The inner diameter is matched, the secondary pressure-bearing sleeve shaft 4 is nested on the secondary basic main shaft 6 to form a closed secondary pressure-bearing cavity 24, the bottom end of the secondary basic main shaft 6 is welded to the secondary base 8 as a whole, and a secondary middle air guide pipeline 22 connected to the secondary pressure-bearing cavity 24 is opened along its axial direction at the central position of the secondary basic main shaft 6, and the bottom end side wall of the secondary basic main shaft 6 is connected to a secondary gas injection pipeline 26 connected to the secondary middle gas guide pipeline 22, and a secondary gas filling and discharging switch 27 is provided on the secondary gas injection pipeline 26;

[0045] The half-bowl-shaped structure of the primary material holding device 1 is 300-500mm higher than the half-bowl-shaped structure of the secondary material holding device 2 in the longitudinal direction, and the projections of the half-bowl-shaped structure of the primary material holding device 1 and the half-bowl-shaped structure of the secondary material holding device 2 in the horizontal direction overlap, and the overlapping area is 1 / 5-1 / 4 of the area of ​​the primary material holding device 1.

[0046] In this embodiment, at least two parallel semicircular annular grooves 1 are provided at the edge of the lower inner surface of the primary pressure-bearing sleeve shaft 3, and primary sealing ring strips 21 with circular interfaces are installed in each of the annular grooves 1.

[0047] In this embodiment, at least two parallel semicircular annular grooves 2 are provided at the edge of the lower inner surface of the secondary pressure-bearing sleeve shaft 4, and secondary sealing ring strips 20 with circular interfaces are installed in each of the annular grooves 2.

[0048] In this embodiment, mounting steel bars are welded to both side edges of the primary base 7 and the secondary base 8, and the mounting steel bars are provided with mounting horizontal light holes. The positions of the mounting horizontal light holes on the primary base 7 and the mounting horizontal light holes on the secondary base 8 correspond one to one, and the primary base 7 and the secondary base 8 are connected as a whole through the matching of the mounting horizontal light holes, the base fastening bolts 9 and the base fastening nuts 10.

[0049] In this embodiment, the aperture of the installation horizontal light hole is 10-15 mm.

[0050] In this embodiment, the length and width of the half-bowl-shaped structure of the primary material holding device 1 are respectively smaller than the length and width of the half-bowl-shaped structure of the secondary material holding device 2 by 20-60 mm.

[0051] In this embodiment, the angle between the chute slide 15 and the upper surface of the base fixing device is 15-45°.

[0052] The method for using the double half-bowl air cushion type mining material buffer device comprises the following steps:

[0053] Step 1: Open the primary gas charging and discharging switch 17 and the secondary gas charging and discharging switch 27 respectively, and inject a certain amount of gas into the primary pressure-bearing cavity 25 and the secondary gas charging and discharging switch 27 through the primary gas injection pipeline 16 and the secondary gas injection pipeline 26 respectively, and then close the primary gas charging and discharging switch 17 and the secondary gas charging and discharging switch 27;

[0054] Step 2: Place the entire device below the feeding pipe 29 and ensure that the upper end of the primary material holding device 1 is aligned with the lower end of the feeding pipe 29, so that the filling material particles 30 in the feeding pipe 29 first enter the primary buffer unit to achieve primary buffering, and then enter the secondary buffer unit to achieve secondary buffering. After the secondary buffering, the filling material particles 30 enter the chute slide 15;

[0055] Step 3: Park a transport device such as a mine car at the lower end of the chute slide 15, and the filling material particles 30 enter the chute slide 15 and slide along the chute slide 15 into the transport device such as a mine car for loading.

[0056] Working principle: the filling material particles 30 of the feeding pipe 29 fall into the primary material holding device 1. Under the impact of the falling material, the gas in the primary pressure-bearing cavity 25 in the primary buffer unit is compressed to absorb the kinetic energy of the filling material particles 30, thereby realizing primary buffering. Then, the filling material particles 30 enter the secondary material holding device 2. Similarly, under the impact of the filling material particles 30, the gas in the secondary pressure-bearing cavity 24 in the secondary buffer unit is compressed to absorb the kinetic energy of the filling material particles 30, thereby realizing secondary buffering. Then, the filling material particles 30 enter the chute slide 15 of the receiving chute, and then slide into a transport device such as a mine car. Among them, the primary material holding device 1 and the secondary material holding device 2 will reset under the elastic action of the compressed gas and enter the next receiving buffer cycle. This process is repeated as the material falls, thereby realizing multi-level buffering of the filling material particles 30 thrown out of the feeding pipe 29, thereby greatly reducing the impact of the material on the bottom storage bin, and realizing the safe delivery of solid materials.

[0057] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. 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. A double half-bowl air cushion type mining material buffer device, characterized in that: It includes a primary buffer unit, a secondary buffer unit, a material receiving chute and a base fixing device; The primary buffer unit comprises a primary material holding device (1), a primary pressure-bearing sleeve shaft (3), a primary basic main shaft (5), a primary sliding guide rod (11) and a primary sliding rod sleeve (13); The secondary buffer unit comprises a secondary material holding device (2), a secondary pressure-bearing sleeve shaft (4), a secondary basic main shaft (6), a secondary sliding guide rod (12) and a secondary sliding rod sleeve (14); The material receiving chute is obliquely arranged between the primary buffer unit and the secondary buffer unit, and the material receiving chute comprises a chute slide plate (15) and a support column (28), and the support column (28) is welded on the lower surface of the chute slide plate (15); The base fixing device comprises a primary base (7) and a secondary base (8), and both the primary base (7) and the secondary base (8) are semicircular steel plate structures, and the primary base (7) and the secondary base (8) are respectively provided with a primary sliding guide rod light hole (18) adapted to the primary sliding guide rod (11) and a secondary sliding guide rod light hole (31) adapted to the secondary sliding guide rod (12) at their edge positions, and the primary base (7) and the secondary base (8) are respectively provided with a support column light hole (19) corresponding to and adapted to the support column (28) one by one; The first-level material holding device (1) is a half-bowl-shaped structure with a bottom support, and the lower part of the first-level material holding device (1) is welded to a first-level pressure-bearing sleeve shaft (3) as a whole, and the first-level pressure-bearing sleeve shaft (3) is a cylindrical sleeve-shaped structure. The outer side wall of the first-level material holding device (1) is fixed with a first-level sliding rod sleeve (13) slidably connected to the first-level sliding guide rod (11), and the first-level sliding guide rod (11) is vertically inserted in the first-level sliding guide rod light hole (18), and the first-level basic main shaft (5) is a cylindrical columnar structure, and the outer diameter of the first-level basic main shaft (5) is equal to the inner diameter of the first-level pressure-bearing sleeve shaft (3). The first-level pressure-bearing sleeve shaft (3) is nested on the first-level basic main shaft (5) to form a sealed first-level pressure-bearing cavity (25); the bottom end of the first-level basic main shaft (5) is welded to the first-level base (7) as a whole; a first-level middle air guide pipeline (23) connected to the first-level pressure-bearing cavity (25) is opened along its axial direction at the central position of the first-level basic main shaft (5); a first-level gas injection pipeline (16) connected to the first-level middle air guide pipeline (23) is connected to the side wall of the bottom end of the first-level basic main shaft (5); and a first-level gas filling and discharging switch (17) is provided on the first-level gas injection pipeline (16); The secondary material holding device (2) is a semi-bowl-shaped structure with a bottom support, and the lower part of the secondary material holding device (2) is welded to the secondary pressure-bearing sleeve shaft (4) as a whole, and the secondary pressure-bearing sleeve shaft (4) is a cylindrical sleeve-shaped structure. The outer side wall of the secondary material holding device (2) is fixed with a secondary sliding rod sleeve (14) slidably connected to the secondary sliding guide rod (12), and the secondary sliding guide rod (12) is vertically inserted in the secondary sliding guide rod light hole (31), and the secondary basic main shaft (6) is a cylindrical columnar structure, and the outer diameter of the secondary basic main shaft (6) is the same as the inner diameter of the secondary pressure-bearing sleeve shaft (4). The secondary pressure-bearing sleeve shaft (4) is nested on the secondary basic main shaft (6) to form a closed secondary pressure-bearing cavity (24); the bottom end of the secondary basic main shaft (6) is welded to the secondary base (8) as a whole; a secondary middle air guide pipeline (22) connected to the secondary pressure-bearing cavity (24) is opened along its axial direction at the central position of the secondary basic main shaft (6); a secondary gas injection pipeline (26) connected to the secondary middle air guide pipeline (22) is connected to the side wall of the bottom end of the secondary basic main shaft (6); and a secondary gas filling and discharging switch (27) is provided on the secondary gas injection pipeline (26); The half-bowl-shaped structure of the primary material holding device (1) is 300-500 mm higher than the half-bowl-shaped structure of the secondary material holding device (2) in the longitudinal direction, and the projections of the half-bowl-shaped structure of the primary material holding device (1) and the half-bowl-shaped structure of the secondary material holding device (2) in the horizontal direction overlap, and the overlapping area is 1 / 5-1 / 4 of the area of ​​the primary material holding device (1).

2. The double half-bowl air cushion type mining material buffer device according to claim 1 is characterized in that: At least two parallel semicircular annular grooves are provided at the edge of the lower inner surface of the primary pressure-bearing sleeve shaft (3), and primary sealing ring strips (21) with circular interfaces are installed in the annular grooves.

3. The double half-bowl air cushion type mining material buffer device according to claim 1 is characterized in that: At least two parallel semicircular annular grooves are provided at the edge of the lower portion of the inner surface of the secondary pressure-bearing sleeve shaft (4), and secondary sealing ring strips (20) with circular interfaces are installed in the annular grooves.

4. The double half-bowl air cushion type mining material buffer device according to claim 1, characterized in that: Both side edges of the primary base (7) and the secondary base (8) are welded with mounting steel bars, and both mounting steel bars are provided with mounting horizontal light holes. The positions of the mounting horizontal light holes on the primary base (7) and the mounting horizontal light holes on the secondary base (8) correspond to each other, and the primary base (7) and the secondary base (8) are connected as a whole through the matching of the mounting horizontal light holes, the base fastening bolts (9) and the base fastening nuts (10).

5. The double half-bowl air cushion type mining material buffer device according to claim 4 is characterized in that: The aperture of the installation horizontal light hole is 10-15 mm.

6. The double half-bowl air cushion type mining material buffer device according to claim 1, characterized in that: The length and width of the half-bowl-shaped structure of the primary material holding device (1) are respectively 20-60 mm smaller than the length and width of the half-bowl-shaped structure of the secondary material holding device (2).

7. The double half-bowl air cushion type mining material buffer device according to claim 1, characterized in that: The angle between the chute slide plate (15) and the upper surface of the base fixing device is 15-45°.

8. The method for using the double half-bowl air cushion type mining material buffer device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Open the first-level gas charging and discharging switch (17) and the second-level gas charging and discharging switch (27) respectively, and inject a certain amount of gas into the first-level pressure-bearing cavity (25) and the second-level gas charging and discharging switch (27) through the first-level gas injection pipeline (16) and the second-level gas injection pipeline (26), and then close the first-level gas charging and discharging switch (17) and the second-level gas charging and discharging switch (27); Step 2: Place the entire device below the feeding pipe (29), and ensure that the upper end of the primary material holding device (1) is aligned with the lower end of the feeding pipe (29), so that the filling material particles (30) in the feeding pipe (29) first enter the primary buffer unit to achieve primary buffering, and then enter the secondary buffer unit to achieve secondary buffering. After the secondary buffering, the filling material particles (30) enter the chute slide (15); Step 3: The mine car carrier is parked at the lower end of the chute slide (15), and the filling material particles (30) enter the chute slide (15) and slide down along the chute slide (15) into the mine car carrier for loading.

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