CN111375254A - Easy dust collection and anti-blocking cloth bag adsorption type coal mine safety dust falling device - Google Patents
Easy dust collection and anti-blocking cloth bag adsorption type coal mine safety dust falling device Download PDFInfo
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- CN111375254A CN111375254A CN202010349536.XA CN202010349536A CN111375254A CN 111375254 A CN111375254 A CN 111375254A CN 202010349536 A CN202010349536 A CN 202010349536A CN 111375254 A CN111375254 A CN 111375254A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
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Abstract
The invention discloses a bag-adsorption type coal mine safety dust falling device easy to collect dust and preventing blockage, which comprises a supporting base, wherein the upper surface of the supporting base is connected with the lower surface of a dust collecting frame through a first sliding structure, the upper surface of the supporting base is fixedly connected with a supporting piece, a dust collecting drawer is installed on the dust collecting frame, the dust collecting frame is fixedly connected to the lower end of the outer side of a lantern ring, a connecting pipe is arranged on the right side of the supporting piece in a penetrating mode, a supporting pipe is connected to the left side of the supporting piece in a bearing mode, a guide groove is formed in the outer side of the supporting pipe. This easily collect dirt and prevent stifled sack absorption formula colliery safety dust device can pass through servo motor's positive and negative rotation for the sack rotates, and slap the sack part that is in album dirt frame, so that in the sack part in the collection dirt frame on the coal dust was patted into album dirt drawer, and then can be convenient for collect the coal dust, and avoided the sack to be blockked up the condition.
Description
Technical Field
The invention relates to the technical field of coal mine safety correlation, in particular to a bag-adsorption type coal mine safety dust falling device which is easy to collect dust and is anti-blocking.
Background
The coal mine is a mining area which is used for producing coal, when workers work in the coal mine, due to the fact that coal dust in the coal mine is more, the workers are prone to suffer from pneumoconiosis when working in the area for a long time, and in order to reduce the probability that the workers suffer from the pneumoconiosis and improve the working environment, dust is often reduced in the coal mine through a blowing mode, a water splashing mode or a blowing mode, so that the working environment of the workers is improved, and the probability that the workers suffer from the pneumoconiosis is reduced.
However, the existing coal mine safety dust settling device has the following problems in the using process, such as:
1. when the existing coal mine safety dust falling device is used, coal dust is inconvenient to collect, because the coal dust is adsorbed on the cloth bag when the existing coal mine safety dust falling device falls the dust, and the coal dust is easy to fly when the coal dust on the cloth bag is collected later;
2. when the existing coal mine safety dust falling device is used, a certain amount of coal dust is adsorbed on the cloth bag after the cloth bag is used for a period of time, and a needle hole of the cloth bag is easily plugged, so that the dust removal efficiency of the coal mine safety dust falling device is reduced, and if the cloth bag is replaced, time is wasted, and the workload of workers is increased.
To sum up, the sack adsorption type coal mine safety dust device that easily gathers dirt and prevents stifled has now been designed, and it can be collected the coal dust, avoids the coal dust to fly away to can avoid the coal dust to block up the sack, not only reduce the frequency that the sack was changed, and guaranteed the effect that the sack adsorbs the coal dust.
Disclosure of Invention
The invention aims to provide a bag-adsorption type coal mine safety dust-settling device which is easy to collect dust and is anti-blocking, and aims to solve the problems that the existing coal mine safety dust-settling device is inconvenient to collect dust and the bag on the coal mine safety dust-settling device is easy to block, so that the dust-collecting efficiency is reduced in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a cloth bag adsorption type coal mine safety dust falling device easy to collect dust and prevent blocking comprises a supporting base, wherein the upper surface of the supporting base is connected with the lower surface of a dust collecting frame through a first sliding structure, the upper surface of the supporting base is fixedly connected with a supporting piece, a dust collecting drawer is installed on the dust collecting frame, the dust collecting frame is fixedly connected to the lower end of the outer side of a sleeve ring, a connecting pipe is arranged on the right side of the supporting piece in a penetrating mode, a supporting pipe is connected to a left side bearing of the supporting piece, a guide groove is formed in the outer side of the supporting pipe and is connected with a guide block in a sliding mode, the guide block is fixedly connected to the inner side of the sleeve ring, the sleeve ring is arranged on the outer side of the supporting pipe in a nested mode, the left end of the supporting pipe is covered with a cloth bag, the cloth bag, the inner side of the fan blade mounting ring is connected with the right end of the outer side of the connecting sleeve through the rack rod, fan blades are distributed at the left end of the outer side of the connecting sleeve, second ratchets are distributed on the inner side of the connecting sleeve, the second ratchets are meshed and connected between second ratchets, the second ratchets are distributed on the outer side of the left end of the shaft rod, the shaft rod penetrates through the connecting sleeve, first ratchets are distributed on the outer side of the middle of the shaft rod, the first ratchets are meshed and connected between the first ratchets, the first ratchets are distributed on the inner side of the supporting tube in an annular mode, the shaft rod is.
Preferably, the first sliding structure and the second sliding structure are both composed of sliding grooves and sliding blocks, the sliding grooves on the first sliding structure and the second sliding structure are respectively in a strip shape and an annular shape, and the sliding blocks on the first sliding structure and the second sliding structure are respectively in a rectangular block shape and an arc block shape.
Preferably, the connecting pipe and the supporting pipe are arranged in a penetrating manner, and the connecting pipe and the supporting piece are integrally arranged.
Preferably, the axis of the shaft is parallel to and non-collinear with the axis of the support tube.
Preferably, the outer side of the shaft rod is connected with the middle of the connecting shaft through a worm and gear structure, the connecting shaft bearing is connected between the supporting sheets, the supporting sheets are fixedly connected to the supporting pieces, the connecting shaft is provided with a shifting lever about the outer sides of the two sides of the worm and gear structure, a linkage rod is arranged below the shifting lever, the lower end shaft of the linkage rod is connected to one end of the connecting rod, the connecting rod is close to one end of the linkage rod and is fixedly connected with a limiting block, the other end of the linkage rod is fixedly connected to one side of the flapping sheet, the upper end of the flapping sheet is connected to the outer side of the shaft tube, the shaft tube bearing is connected between the supporting sheets, a supporting shaft penetrates through the shaft tube, the supporting shaft is fixedly connected between the supporting sheets.
Preferably, the ratchet mechanism formed by the first pawl and the first ratchet is opposite to the ratchet mechanism formed by the second pawl and the second ratchet.
Preferably, deflector rods are distributed on the outer side of the connecting shaft at equal intervals, and the deflector rods and the linkage rods are arranged in a one-to-one correspondence manner.
Preferably, the flapping pieces on the shaft tube form a semicircular structure, and only 2 flapping pieces on the left outer side are vertically and fixedly connected with a connecting rod.
Preferably, the structural shape of the guide groove is an inclined ring shape.
Compared with the prior art, the invention has the beneficial effects that: this easily album dirt and prevent stifled sack absorption formula colliery safety dust device can pass through servo motor's positive reversal for the sack rotates, and slap the sack part that is in album dirt frame, so that in the sack part in the collection dirt frame on the coal dust was patted into album dirt drawer, and then can be convenient for collect the coal dust, and avoided the sack to be blockked up the condition:
1. the fan blades and the supporting tube rotate at intervals through the positive and negative rotation of the servo motor, so that the position of the cloth bag entering the dust collecting frame can be changed, and the dust collecting frame can move through the guide block and the guide groove when the supporting tube rotates, so that after the cloth bag partially rotates into the dust collecting frame, coal dust on the cloth bag is prevented from overflowing and flying through a gap between the dust collecting frame and the cloth bag when the cloth bag is flapped;
2. through servo motor's positive and negative rotation for the driving lever just effectually stirs the gangbar after the sack part that contains the coal dust rotates to collecting in the dirt frame, and rotate with driving the slapping piece through the connecting rod, and after driving lever and gangbar break away from, under the effect of torsional spring, make reverse motion and slap the sack that contains the coal dust, and then can beat down the coal dust on the sack, avoided the jam of coal dust to the sack.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic sectional view of the connection structure of the dust collecting frame according to the present invention;
FIG. 3 is a partial main sectional structural view of the present invention;
FIG. 4 is an enlarged view of point A of FIG. 3 according to the present invention;
FIG. 5 is an enlarged view of point B of FIG. 3 according to the present invention;
FIG. 6 is a schematic view of the connection structure of the fan blade mounting ring and the shaft rod of the present invention;
FIG. 7 is a schematic view of a flapper distribution structure according to the present invention;
FIG. 8 is a schematic top view of the support tube of the present invention.
In the figure: 1. a support base; 2. a support member; 3. a first sliding structure; 4. a dust collection frame; 5. a dust collection drawer; 6. a connecting pipe; 7. supporting a tube; 8. a collar; 9. a hose clamp; 10. a cloth bag; 11. a second sliding structure; 12. a fan blade mounting ring; 13. connecting sleeves; 14. a shaft lever; 15. a first pawl; 16. a first ratchet; 17. a worm and gear structure; 18. a connecting shaft; 19. a deflector rod; 20. a connecting rod; 21. slapping the film; 22. an axle tube; 23. a torsion spring; 24. a support shaft; 25. a limiting block; 26. a linkage rod; 27. a second pawl; 28. a second ratchet; 29. a frame bar; 30. a fan blade; 31. a guide block; 32. a guide groove; 33. a servo motor; 34. a support sheet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, the present invention provides a technical solution: a cloth bag adsorption type coal mine safety dust falling device easy to collect dust and prevent blocking comprises a supporting base 1, a supporting piece 2, a first sliding structure 3, a dust collecting frame 4, a dust collecting drawer 5, a connecting pipe 6, a supporting pipe 7, a lantern ring 8, a throat hoop 9, a cloth bag 10, a second sliding structure 11, a fan blade mounting ring 12, a connecting sleeve 13, a shaft rod 14, a first pawl 15, a first ratchet 16, a worm and gear structure 17, a connecting shaft 18, a deflector rod 19, a connecting rod 20, a patting sheet 21, a shaft pipe 22, a torsion spring 23, a supporting shaft 24, a limiting block 25, a linkage rod 26, a second pawl 27, a second ratchet 28, a frame rod 29, a fan blade 30, a guide block 31, a guide groove 32, a servo motor 33 and a supporting sheet 34, wherein the upper surface of the supporting base 1 is connected with the lower surface of the dust collecting frame 4 through the first sliding structure 3, the supporting base 1 is fixedly connected with the supporting piece, the dust collecting frame 4 is fixedly connected to the lower end of the outer side of the lantern ring 8, the right side of the supporting member 2 is provided with the connecting pipe 6 in a penetrating manner, the left side bearing of the supporting member 2 is connected with the supporting pipe 7, the outer side of the supporting pipe 7 is provided with the guide groove 32, the guide block 31 is connected with the inner side of the lantern ring 8 in a sliding manner, the lantern ring 8 is arranged at the outer side of the supporting pipe 7 in a nesting manner, the left end of the supporting pipe 7 is covered with the cloth bag 10, the cloth bag 10 is fixed at the left end of the supporting pipe 7 through the throat hoop 9, the left end of the inner side of the supporting pipe 7 is connected with the outer side of the fan blade mounting ring 12 through the second sliding structure 11, the inner side of the fan blade mounting ring 12 is connected with the right end of the outer side of the connecting sleeve 13 through the rack bar 29, the, and the second pawl 27 distributes in the left end outside of axostylus axostyle 14, and axostylus axostyle 14 runs through the setting of adapter sleeve 13, and the middle part outside of axostylus axostyle 14 distributes and has first pawl 15, and first pawl 15 meshes and connects between first ratchet 16, and first ratchet 16 annular distributes in the inboard of stay tube 7, and the coaxial fixed connection in servo motor 33's of axostylus axostyle 14 axle head, and servo motor 33 installs in the slotted hole on support piece 2.
First sliding structure 3 and second sliding structure 11 constitute by spout and slider, and the spout on first sliding structure 3 and the second sliding structure 11 is the bar respectively and the annular to the slider on first sliding structure 3 and the second sliding structure 11 is rectangular block and arc massive structure respectively, can be convenient for collect dirt frame 4 horizontal slip, and can be convenient for flabellum collar 12 is the annular slip for stay tube 7.
The connecting pipe 6 and the supporting pipe 7 are arranged in a penetrating manner, and the connecting pipe 6 and the supporting piece 2 are integrally arranged, so that the air flow can be conveniently discharged through the connecting pipe 6, and the stability of the device can be improved.
The axis of the shaft 14 is parallel to and non-collinear with the axis of the support tube 7, and the support tube 7 can be driven to rotate by the first pawl 15 and the first ratchet 16 when the shaft 14 rotates.
The outer side of the shaft lever 14 is connected with the middle part of the connecting shaft 18 through the worm and gear structure 17, the connecting shaft 18 is connected between the supporting pieces 34 in a bearing mode, the supporting pieces 34 are fixedly connected to the supporting pieces 2, the driving lever 19 is distributed on the outer side of the connecting shaft 18 relative to the two sides of the worm and gear structure 17, the linkage rod 26 is arranged below the driving lever 19, the lower end of the linkage rod 26 is connected to one end of the connecting rod 20 in a shaft mode, one end, close to the linkage rod 26, of the connecting rod 20 is fixedly connected with the limiting block 25, the other end of the linkage rod 26 is fixedly connected to one side of the flapping piece 21, the upper end of the flapping piece 21 is connected to the outer side of the shaft tube 22, the shaft tube 22 is connected between the supporting pieces 34 in a bearing mode, the supporting shaft 24 penetrates through the shaft tube, when the shaft lever 14 rotates, the slapping sheet 21 is slapped to the cloth bag 10, so that coal dust on the cloth bag 10 is slapped, the cloth bag 10 can be prevented from being blocked, and the dust collecting frame 4 can collect the coal dust conveniently.
The ratchet mechanism formed by the first pawl 15 and the first ratchet 16 is opposite to the ratchet mechanism formed by the second pawl 27 and the second ratchet 28, so that when the shaft lever 14 rotates, only the connecting sleeve 13 or the supporting pipe 7 is driven to rotate.
The slapping sheets 21 on the shaft tube 22 form a semicircular structure, and only 2 slapping sheets 21 on the left outer side are vertically and fixedly connected with the connecting rod 20, so that a half of the cloth bag 10 in the dust collecting frame 4 can be slapped conveniently.
The guide groove 32 has a slanted annular shape, and allows the dust collection frame 4 to reciprocate when the support pipe 7 rotates.
The working principle is as follows: install this easily album of dirt and prevent stifled sack adsorption coal mine safety dust device at the position of use at first to switch on the device's power, use according to following mode again:
according to fig. 1-8, the servomotor 33 is activated, so that the servomotor 33 rotates the shaft 14 in the forward direction;
when the shaft lever 14 rotates in the forward direction, the connecting sleeve 13 is driven to rotate by the second pawl 27 and the second ratchet 28, so that the fan blades 30 rotate at a high speed, and the end of the supporting tube 7 of the cloth bag 10 generates suction force, so that coal dust moves along with air in the direction of the cloth bag 10;
when air passes through the cloth bag 10, coal dust in the air can be adsorbed by the cloth bag 10, so that the aim of reducing dust in a coal mine area can be fulfilled;
after a certain amount of coal dust is adsorbed on the cloth bag 10, the servo motor 33 drives the shaft rod 14 to rotate in the reverse direction (the forward and reverse rotation of the servo motor 33 can be controlled by corresponding facilities, which is the prior art and is not described in detail herein);
when the shaft lever 14 rotates reversely, the support tube 7 is driven to rotate by the first pawl 15 and the first ratchet 16, and the position of the fan blade mounting ring 12 is kept unchanged by the action of the second sliding structure 11 and the shaft lever 14;
when the supporting tube 7 rotates, the dust collecting frame 4 and the lantern ring 8 are limited by the guide groove 32 and the guide block 31 on the outer side of the supporting tube and the first sliding structure 3, so that the lantern ring 8 drives the dust collecting frame 4 to slide on the supporting base 1 through the first sliding structure 3, and the dust collecting frame 4 gradually approaches to the part of the cloth bag 10 which rotates to enter the inner side of the supporting tube;
then, the servo motor 33 drives the shaft rod 14 to rotate forwards again;
through the forward rotation of the shaft lever 14, not only can the rotation of the fan blades 30 in the above process be realized, but also the worm and gear structure 17 can drive the connecting shaft 18 to rotate, and the shifting rod 19 connected with the connecting shaft 18 can effectively shift the linkage rod 26, so that the connecting rod 20 drives the flapping piece 21 to rotate relative to the supporting shaft 24, and the torsion spring 23 can generate elastic potential energy;
after the shifting rod 19 is separated from the linkage rod 26, under the action of the reset force of the torsion spring 23, the slapping piece 21 rotates reversely, slapping the cloth bag 10 at the inner side of the dust collection frame 4 through inertia, slapping down the coal dust on the cloth bag 10, dropping the coal dust into the dust collection drawer 5 in the dust collection frame 4, and then, drawing out the dust collection drawer 5 to perform centralized processing on the coal dust;
the above-described process is repeated, so that the probability of the cloth bag 10 being clogged can be reduced, the dust settling effect of the dust settling device can be improved, and the dust can be conveniently collected.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides an easily collect dirt and prevent stifled sack absorption formula coal mine safety dust device, includes support base (1), its characterized in that: the upper surface of the supporting base (1) is connected with the lower surface of a dust collecting frame (4) through a first sliding structure (3), the upper surface of the supporting base (1) is fixedly connected with a supporting piece (2), a dust collecting drawer (5) is installed on the dust collecting frame (4), the dust collecting frame (4) is fixedly connected with the lower end of the outer side of a lantern ring (8), a connecting pipe (6) is arranged on the right side of the supporting piece (2) in a penetrating mode, the supporting pipe (7) is connected with a left side bearing of the supporting piece (2), a guide groove (32) is arranged on the outer side of the supporting pipe (7), a guide block (31) is connected in the guide groove (32) in a sliding mode, the guide block (31) is fixedly connected to the inner side of the lantern ring (8), the lantern ring (8) is nested in the outer side of the supporting pipe (7), a cloth bag (10) is covered at the left end of the supporting pipe (7), the left end of the inner side of the supporting pipe (7) is connected with the outer side of the fan blade mounting ring (12) through a second sliding structure (11), the inner side of the fan blade mounting ring (12) is connected with the right end of the outer side of the connecting sleeve (13) through a frame rod (29), fan blades (30) are distributed at the left end of the outer side of the connecting sleeve (13), second ratchets (28) are distributed at the inner side of the connecting sleeve (13), the second ratchets (28) are connected between the second pawls (27) in a meshed mode, the second pawls (27) are distributed at the outer side of the left end of the shaft lever (14), the shaft lever (14) penetrates through the connecting sleeve (13), first pawls (15) are distributed at the outer side of the middle of the shaft lever (14), the first pawls (15) are connected between the first pawls (16) in a meshed mode, the first ratchets (16) are distributed at the inner side of the supporting pipe (7) in a circular mode, and the servo motor (33) is arranged in a slot on the support piece (2).
2. The dust settling device for coal mine with easy dust collection and anti-blocking of the bag-type adsorption material of claim 1, wherein: the first sliding structure (3) and the second sliding structure (11) are both formed by sliding grooves and sliding blocks, the sliding grooves in the first sliding structure (3) and the second sliding structure (11) are respectively in a strip shape and an annular shape, and the sliding blocks in the first sliding structure (3) and the second sliding structure (11) are respectively in a rectangular block shape and an arc block shape.
3. The dust settling device for coal mine with easy dust collection and anti-blocking of the bag-type adsorption material of claim 1, wherein: the connecting pipe (6) and the supporting pipe (7) are arranged in a penetrating mode, and the connecting pipe (6) and the supporting piece (2) are integrally arranged.
4. The dust settling device for coal mine with easy dust collection and anti-blocking of the bag-type adsorption material of claim 1, wherein: the axis of the shaft (14) is parallel to and non-collinear with the axis of the support tube (7).
5. The dust settling device for coal mine with easy dust collection and anti-blocking of the bag-type adsorption material of claim 1, wherein: the outer side of the shaft lever (14) is connected with the middle part of the connecting shaft (18) through a worm and gear structure (17), the connecting shaft (18) is in bearing connection with the support sheets (34), the support sheets (34) are fixedly connected to the support pieces (2), the connecting shaft (18) is distributed with shift levers (19) on the outer sides of the two sides of the worm and gear structure (17), a linkage rod (26) is arranged below the shift levers (19), the lower end shaft of the linkage rod (26) is connected with one end of the connecting rod (20), one end of the connecting rod (20) close to the linkage rod (26) is fixedly connected with a limiting block (25), the other end of the linkage rod (26) is fixedly connected with one side of the flapping sheets (21), the upper end of the flapping sheets (21) is in key connection with the outer side of the shaft tube (22), the shaft tube (22) is in bearing connection with the support sheets (34), and the shaft tube (22, the supporting shaft (24) is fixedly connected between the supporting plates (34), and the outer side of the supporting shaft (24) and the inner side of the shaft tube (22) are respectively welded and fixed at two ends of the torsion spring (23).
6. The dust settling device for coal mine with easy dust collection and anti-blocking of the bag-type adsorption material of claim 1, wherein: the ratchet mechanism formed by the first pawl (15) and the first ratchet (16) is opposite to the ratchet mechanism formed by the second pawl (27) and the second ratchet (28).
7. The dust settling device for coal mine of easy dust collection and anti-blocking cloth bag adsorption type as claimed in claim 5, wherein: deflector rods (19) are distributed on the outer side of the connecting shaft (18) at equal intervals, and the deflector rods (19) and the linkage rods (26) are arranged in a one-to-one correspondence mode.
8. The dust settling device for coal mine of easy dust collection and anti-blocking cloth bag adsorption type as claimed in claim 5, wherein: the flapping sheets (21) on the shaft tube (22) form a semicircular structure, and only 2 flapping sheets (21) on the left outer side are vertically and fixedly connected with a connecting rod (20).
9. The dust settling device for coal mine with easy dust collection and anti-blocking of the bag-type adsorption material of claim 1, wherein: the structural shape of the guide groove (32) is an inclined ring shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010349536.XA CN111375254B (en) | 2020-04-28 | 2020-04-28 | Easy dust collection and anti-blocking cloth bag adsorption type coal mine safety dust falling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010349536.XA CN111375254B (en) | 2020-04-28 | 2020-04-28 | Easy dust collection and anti-blocking cloth bag adsorption type coal mine safety dust falling device |
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| CN111375254A true CN111375254A (en) | 2020-07-07 |
| CN111375254B CN111375254B (en) | 2021-08-13 |
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