CN219552370U - Limestone strength detection device for rotary kiln calcination - Google Patents

Abstract

The utility model relates to the technical field of pellet production, and discloses a limestone strength detection device for rotary kiln calcination, which comprises a rotary drum, wherein the rotary drum can be used for adding limestone and driving the limestone to rotate; the heating mechanism is connected to the rotary drum and can heat the limestone in the rotary drum; the cover sealing mechanism is connected to the rotary drum and comprises a feeding cover sealing assembly and a discharging cover sealing assembly which are fixed in position, and limestone can be conveyed into the rotary drum through the feeding cover sealing assembly. The limestone strength detection device for calcination of the rotary kiln is characterized in that the positions of the feeding sealing cover assembly and the discharging sealing cover assembly are fixed through the sealing cover mechanism when the limestone calcining device is used, and the feeding sealing cover assembly or the discharging sealing cover assembly can be directly opened to operate when limestone is conveyed into the rotary drum or processed in the rotary drum is conveyed outwards, so that the rotary kiln is free from angle adjustment to the rotary drum, and is convenient to use.

Description

Limestone strength detection device for rotary kiln calcination

Technical Field

The utility model relates to the technical field of pellet production, in particular to a limestone strength detection device for rotary kiln calcination.

Background

In the steelmaking process, limestone is not usually used, but active lime, namely, the part of free calcium oxide which is generated after limestone is calcined and can react with water under the common dissolution condition, wherein the active lime is usually obtained by heating and calcining limestone in a rotary kiln, and the strength characteristic (mainly anti-explosion characteristic and abrasion characteristic) of the limestone is one of key factors for determining the desulfurization effect of the active lime, so that the detection of the anti-explosion performance and the abrasion performance of the limestone is necessary.

The patent in China with the publication number of CN215493395U discloses a limestone strength detection device for rotary kiln calcination, which comprises a rotary drum arranged above a bracket, wherein a fireproof layer is arranged inside a shell of the rotary drum, a loading and unloading opening is formed in the side wall of the rotary drum, and a sealing cover is arranged at the loading and unloading opening; two groups of gear rings are sleeved on the outer wall of the rotary drum; the support is also fixedly provided with a motor, a power output shaft of the motor is connected with a driving wheel, and the driving wheel is meshed with a gear ring; the lower part of the other gear ring is meshed with a driving wheel, and the driving wheel realize power transmission through a connecting shaft; circular flame holes are formed in the centers of the front side and the rear side of the rotary drum, inclined round holes pointing downwards are formed in the centers of the fire baffle plates, front-end nozzles of the burner penetrate through the round holes and extend into the rotary drum, when the rotary drum is used, the sealing cover is opened to convey limestone into the rotary drum, the motor drives the driving wheel to rotate, the driving wheel is driven to rotate, stable rotation of the rotary drum is achieved through the gear ring, meanwhile, limestone in the rotary drum is heated through the burner, however, the sealing cover is connected to the rotary drum, the sealing cover is driven to rotate when the rotary drum rotates, limestone is required to be added into the rotary drum or the sealing cover is required to be rotated to a pointed position when the limestone in the rotary drum is conveyed outwards, and the sealing cover is opened, so that the rotary drum is inconvenient to use.

Disclosure of Invention

The utility model aims to provide a limestone strength detection device for rotary kiln calcination, which aims to solve the problems in the background technology.

The embodiment of the utility model adopts the following technical scheme:

the utility model provides a limestone strength detection device for rotary kiln calcination, includes the rotary drum, and the rotary drum can add limestone and drive the limestone rotation; the heating mechanism is connected to the rotary drum and can heat the limestone in the rotary drum; the sealing mechanism is connected to the rotary drum and comprises a feeding sealing cover assembly and a discharging sealing cover assembly, wherein the feeding sealing cover assembly and the discharging sealing cover assembly are fixed in positions, limestone can be conveyed into the rotary drum through the feeding sealing cover assembly, limestone in the rotary drum can be conveyed outwards through the discharging sealing cover assembly, and the feeding sealing cover assembly and the discharging sealing cover assembly are fixed in positions so as to facilitate adding or taking out of limestone.

Preferably, the capping mechanism further comprises a fixing ring, wherein the front lower end of the fixing ring is connected with two first supporting pieces, the rear lower end of the fixing ring is connected with two second supporting pieces, and the first supporting pieces and the second supporting pieces can support the fixing ring.

Preferably, the feeding cover assembly comprises a first cover, a first hinge is connected between the first cover and the fixed ring, the first hinge can connect the first cover on the fixed ring, two positioning assemblies are connected on the fixed ring, and the positioning assemblies can position the first cover.

Preferably, the first hinge member includes two first lugs, two rotate between the first lugs and be connected with first dwang, the outside of first dwang is connected with first connecting plate, the one end and the first closing cap of first connecting plate are connected, first closing cap can regard first dwang as the axle center and overturn from top to bottom.

Preferably, the positioning assembly comprises a shell, an opening and a clamping groove are formed in the front side of the shell, a positioning plate is inserted into one side, close to the first sealing cover, of the fixing ring, the positioning plate can position the first sealing cover, an elastic piece is fixed on one side, far away from the first sealing cover, of the positioning plate, a hinge plate is hinged to the front side of the positioning plate, the front end of the hinge plate penetrates through the opening, and the hinge plate is rotatably clamped into the clamping groove after being separated from the first sealing cover, so that the positioning plate is positioned.

Preferably, the discharging sealing cover assembly comprises a second sealing cover, a second hinge piece is connected between the second sealing cover and the fixed ring, a driving assembly is connected to the second hinge piece, the second hinge piece can enable the second sealing cover to be hinged to the bottom of the fixed ring, and the driving assembly can drive the second hinge piece to drive the second sealing cover to automatically turn over.

Preferably, the second hinge piece includes two second lugs, two rotate between the second lug and be connected with the second dwang, the outside of second dwang is connected with the second connecting plate, the one end and the second closing cap of second connecting plate are connected, the second dwang runs through two second lugs, the both ends of second dwang all are connected with driven gear, the second closing cap can use the second dwang as the axle center upset around.

Preferably, the driving assembly comprises an electric telescopic rod, a movable plate is connected to the telescopic end of the electric telescopic rod, two toothed plates are connected to the movable plate and are respectively connected with two driven gears in a meshed mode, the electric telescopic rod can drive the toothed plates to move back and forth, the toothed plates drive the driven gears to rotate, and the driven gears drive the second rotating rod to rotate when rotating.

Preferably, the heating mechanism comprises a burner, one end of the burner is connected with a gas pipe and a combustion air pipe, the gas pipe can convey gas into the burner, the burner can ignite the gas to form flame, and the combustion air pipe can convey combustion-supporting air into the burner.

Preferably, the rotary drum comprises two rotating rings and a driving motor, the outer sides of the two rotating rings are respectively connected with an outer gear ring, a transmission rod is connected to an output shaft of the driving motor, two driving gears are connected to the transmission rod and are respectively connected with the two outer gear rings in a meshed mode, and the driving motor can drive the two driving gears and the two outer gear rings to conduct meshed transmission, so that the two rotating rings are driven to rotate in the same direction at the same time.

The beneficial effects of the utility model are as follows:

when the rotary drum is used, the positions of the feeding sealing cover assembly and the discharging sealing cover assembly are fixed through the sealing cover mechanism, and when limestone is conveyed into the rotary drum or processed in the rotary drum is conveyed outwards, the feeding sealing cover assembly or the discharging sealing cover assembly can be directly opened for operation, the rotary drum is not required to be subjected to angle adjustment, and the rotary drum is convenient to use.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the ambit of the technical disclosure.

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic view of the front view of the present utility model;

FIG. 3 is a schematic view of a partial perspective structure of the present utility model;

FIG. 4 is a schematic view of the front view of the feed cap assembly of the present utility model;

fig. 5 is a schematic view showing a bottom appearance of the dispensing closure assembly of the present utility model.

In the figure: 1. a rotating drum; 11. a mounting frame; 12. a rotating ring; 13. a support frame; 14. a roller; 15. an outer ring; 16. an outer toothed ring; 17. a driving motor; 18. a transmission rod; 19. a drive gear; 110. a lifting plate; 111. a pushing plate; 2. a heating mechanism; 21. a mounting plate; 22. a burner; 23. a gas pipe; 24. a combustion air pipe; 3. a capping mechanism; 31. a fixing ring; 32. a first support; 33. a second support; 34. a feed cap assembly; 341. a first cover; 342. a first hinge; 3421. a first bump; 3422. a first rotating lever; 3423. a first connection plate; 343. a positioning assembly; 3431. a housing; 34311. an opening; 34312. a clamping groove; 3432. a positioning plate; 3433. an elastic member; 3434. a hinged plate; 344. a handle; 35. a discharge capping assembly; 351. a second cover; 352. a second hinge; 3521. a second bump; 3522. a second rotating lever; 3523. a second connecting plate; 3524. a driven gear; 353. a drive assembly; 3531. a cross plate; 3532. an electric telescopic rod; 3533. a moving plate; 3534. toothed plate.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings.

As shown in fig. 1 to 5, a limestone strength detecting device for rotary kiln calcination; the lime stone heating device comprises a rotary drum 1, wherein the rotary drum 1 can be used for adding lime stone and driving the lime stone to rotate, a heating mechanism 2 is connected to the rotary drum 1, the heating mechanism 2 can be used for heating the lime stone in the rotary drum 1, a sealing mechanism 3 is connected to the rotary drum 1, the sealing mechanism 3 is used for conveying the lime stone into the rotary drum 1 or conveying the lime stone heated in the rotary drum 1 outwards, the sealing mechanism 3 comprises a feeding sealing cover assembly 34 and a discharging sealing cover assembly 35 which are fixed in positions, the lime stone can be conveyed into the rotary drum 1 through the feeding sealing cover assembly 34, and the lime stone in the rotary drum 1 can be conveyed outwards through the discharging sealing cover assembly 35, so that the positions of the feeding sealing cover assembly 34 and the discharging sealing cover assembly 35 are fixed, and the lime stone can be conveniently added or taken out.

As shown in fig. 1 and 3, the rotary drum 1 includes a mounting frame 11 and two rotating rings 12 disposed above the mounting frame 11, two supporting frames 13 are fixed at two ends of the top of the mounting frame 11, rollers 14 are rotatably connected at front and rear ends of the inner side of the supporting frames 13, outer rings 15 and outer tooth rings 16 are fixed at the outer sides of the two rotating rings 12, the two outer rings 15 are respectively inserted into the two supporting frames 13, the rollers 14 are in contact with the outer rings 15, the rollers 14 can support the outer rings 15, and can drive the outer rings 15 when the rotating rings 12 rotate, a driving motor 17 is fixed at one end of the mounting frame 11, a driving rod 18 is fixed on an output shaft of the driving motor 17, two driving gears 19 are fixed on the driving rod 18, the two driving gears 19 are respectively connected with the two outer tooth rings 16 in a meshed manner, the driving motor 17 drives the driving rod 18 to rotate, and the two driving gears 19 on the driving rod 18 are simultaneously meshed with the two outer tooth rings 16 to drive the two rotating rings 12 to rotate in the same direction.

With continued reference to fig. 1 and 3, two lifting plates 110 and two pushing plates 111 are fixed on the inner side of the rotating ring 12, two ends of the pushing plates 111 are respectively connected with the two rotating rings 12, two ends of the lifting plates 110 are respectively connected with the two rotating rings 12, the pushing plates 111 are in a curved shape, the two pushing plates 111 are symmetrically arranged, and limestone can be gathered between the two rotating rings 12 when the two pushing plates 111 rotate.

As shown in fig. 1, the heating mechanism 2 comprises a mounting plate 21 fixed at two ends of the top of the mounting frame 11, two rotating rings 12 are respectively positioned between the two mounting plates 21, the mounting plate 21 is fixedly provided with a burner 22, opposite ends of the two burners 22 are respectively inserted into the two rotating rings 12, opposite ends of the two burners 22 are respectively fixed with a gas pipe 23, the outsides of the two burners 22 are respectively fixed with a combustion air pipe 24, the gas can be conveyed into the burners 22 through the gas pipes 23, the flame can be conveyed into the rotating rings 12 through the burners 22, and the combustion air can be conveyed into the burners 22 through the combustion air pipes 24.

As shown in fig. 2-5, the capping mechanism 3 includes a fixed ring 31 rotatably connected between two rotating rings 12, one sides of a lifting plate 110 and a pushing plate 111 are respectively contacted with the inner sides of the fixed ring 31, the fixed ring 31 and the two rotating rings 12 are respectively in a double-layer structure, the outer sides are metal shells, the inner sides are fireproof layers (not shown in the drawings), two first supporting members 32 are fixed at the lower end of the front side of the fixed ring 31, two second supporting members 33 are fixed at the lower end of the rear side of the fixed ring 31, the bottoms of the first supporting members 32 and the second supporting members 33 are respectively fixed with the bottom of the mounting frame 11, the first supporting members 32 and the second supporting members 33 can support the fixed ring 31, and the transmission rod 18 respectively penetrates through the first supporting members 32 and the second supporting members 33 and is rotatably connected with the first supporting members 32 and the second supporting members 33.

With continued reference to fig. 2-5, the front middle of the fixed ring 31 is connected with a feeding cover assembly 34, the feeding cover assembly 34 includes a first cover 341, the first cover 341 is inserted into a feeding hole in the front middle of the fixed ring 31, a first hinge 342 is connected between the first cover 341 and the fixed ring 31, the first hinge 342 can connect the first cover 341 to the fixed ring 31, two positioning assemblies 343 are connected to the fixed ring 31, and the positioning assemblies 343 can position the first cover 341 inserted into the feeding hole, and a handle 344 is fixed on the first cover 341.

With continued reference to fig. 2 and 4, the first hinge 342 includes two first protrusions 3421 fixed on the front side of the fixed ring 31, a first rotating rod 3422 is rotatably connected between the two first protrusions 3421, a first connecting plate 3423 is fixed on the outer side of the first rotating rod 3422, one end of the first connecting plate 3423 is fixed with the first cover 341, and when the feed inlet is opened, the first cover 341 can be turned downward with the first rotating rod 3422 as an axis.

With continued reference to fig. 2 and 4, the positioning assembly 343 includes a housing 3431 fixed on the fixed ring 31, an opening 34311 and a slot 34312 are formed on the front side of the housing 3431, a positioning plate 3432 is inserted on one side of the fixed ring 31 close to the first cover 341, a resilient member 3433 is fixed on one side of the positioning plate 3432 far away from the first cover 341, one end of the resilient member 3433 is fixed on the inner side wall of the housing 3431, the resilient member 3433 may be a spring, an elastic sheet or other member with a resilient function, in this embodiment, the resilient member 3433 is a spring, the front side of the positioning plate 3432 is hinged with a hinge plate 3434, the front end of the hinge plate 3434 penetrates through the opening 34311, and the hinge plate 3434 pulls the positioning plate 3432 to be rotatably clamped into the slot 34312 after being separated from the first cover 341, thereby positioning the positioning plate 3432.

As shown in fig. 2 and 5, the discharging cover assembly 35 comprises a second cover 351 inserted into a discharging hole at the bottom of the fixed ring 31, a second hinge member 352 is connected between the second cover 351 and the fixed ring 31, a driving assembly 353 is connected to the second hinge member 352, the second hinge member 352 can enable the second cover 351 to be hinged with the bottom of the fixed ring 31, the driving assembly 353 can drive the second hinge member 352 to drive the second cover 351 to automatically turn over so as to realize opening or closing of the discharging hole, and a collecting hopper is arranged below the discharging hole;

with continued reference to fig. 5, the second hinge 352 includes two second protrusions 3521 fixed at the bottom of the fixed ring 31, a second rotating rod 3522 is rotatably connected between the two second protrusions 3521, a second connecting plate 3523 is fixed on the outer side of the second rotating rod 3522, one end of the second connecting plate 3523 is fixed with the second cover 351, the second rotating rod 3522 penetrates through the two second protrusions 3521, driven gears 3524 are fixed at two ends of the second rotating rod 3522, and the second cover 351 can turn backwards with the second rotating rod 3522 as an axis, so as to open the discharge hole.

With continued reference to fig. 5, the driving assembly 353 includes a transverse plate 3531 fixed between two second supporting members 33, an electric telescopic rod 3532 with a backward telescopic end is fixed at the rear side of the transverse plate 3531, a moving plate 3533 is fixed at the telescopic end of the electric telescopic rod 3532, toothed plates 3534 are fixed at both ends of the front side of the moving plate 3533, the two toothed plates 3534 penetrate through the transverse plate 3531 and are respectively engaged with the bottoms of the two driven gears 3524, the electric telescopic rod 3532 drives the moving plate 3533 to move backward, so that the two toothed plates 3534 can be driven, and the two toothed plates 3534 can be engaged with the two driven gears 3524 simultaneously, thereby driving the second sealing cover 351 to turn backward with the second rotating rod 3522 as an axis, and automatically opening the discharge hole.

Working principle: when in use, the hinged plate 3434 on the positioning component 343 is pulled and the hinged plate 3434 is clamped in the clamping groove 34312, at the moment, the positioning plate 3432 releases the positioning of the first sealing cover 341, the first sealing cover 341 is separated from the feed inlet on the front side of the fixed ring 31 by pulling the handle 344, the limestone can be conveyed into the rotary drum 1 from the feed inlet by a worker, then the first sealing cover 341 is turned back into the feed inlet to seal the feed inlet, the positioning plate 3432 is reset, the first sealing cover 341 is positioned by the positioning plate 3432, the driving motor 17 is started to drive the transmission rod 18 to rotate, the driving gear 19 on the transmission rod 18 is meshed with the external gear ring 16 to drive the two rotating rings 12 to rotate, when the rotating rings 12 rotate, the limestone is rotated upwards by the lifting plate 110 and the pushing plate 111, after the lifting plate 110 or the pushing plate 111 rotates to a certain angle, the limestone falls downwards to realize the crushing of the limestone, simultaneously starting a heating mechanism 2 to heat limestone, after the limestone is processed, closing the heating mechanism 2, starting an electric telescopic rod 3532, driving a moving plate 3533 to move backwards, driving two toothed plates 3534 to move backwards, simultaneously meshed and connected with two driven gears 3524 through the two toothed plates 3534, driving a second sealing cover 351 to turn backwards by taking a second rotating rod 3522 as an axis, thereby automatically opening a discharge hole, loading limestone in a rotary drum 1 from the discharge hole into a collecting hopper, simultaneously continuously rotating a rotating ring 12 to push the limestone to the discharge hole through a pushing plate 111, completely discharging the limestone, naturally cooling the limestone in the collecting hopper to room temperature, sieving the fired (lime) sample by using a manual sieve to obtain a particle size of 20mm and 5mm, weighing the three samples of more than 20m m, 5m m-20 m m and less than 5m m, and finally, calculating the anti-explosion index and the anti-wear index according to a calculation formula (the calculation formula of the anti-explosion index and the anti-wear index is the prior art and is not repeated here).

Claims (10)

1. The utility model provides a rotary kiln calcines and uses limestone intensity detection device which characterized in that includes:

the rotary drum (1), the rotary drum (1) can add limestone and drive the limestone to rotate;

the heating mechanism (2) is connected to the rotary drum (1), and the heating mechanism (2) can heat the limestone in the rotary drum (1);

the sealing mechanism (3) is connected to the rotary drum (1), the sealing mechanism (3) comprises a feeding sealing cover assembly (34) and a discharging sealing cover assembly (35) which are fixed in positions, limestone can be conveyed into the rotary drum (1) through the feeding sealing cover assembly (34), the limestone in the rotary drum (1) can be conveyed outwards through the discharging sealing cover assembly (35), and the positions of the feeding sealing cover assembly (34) and the discharging sealing cover assembly (35) are fixed so as to facilitate adding or taking out limestone.

2. The limestone strength detection device for rotary kiln calcination according to claim 1, wherein: the sealing mechanism (3) further comprises a fixing ring (31), the front lower end of the fixing ring (31) is connected with two first supporting pieces (32), the rear lower end of the fixing ring (31) is connected with two second supporting pieces (33), and the fixing ring (31) can be supported by the first supporting pieces (32) and the second supporting pieces (33).

3. The limestone strength detection device for rotary kiln calcination according to claim 2, wherein: the feeding sealing cover assembly (34) comprises a first sealing cover (341), a first hinge piece (342) is connected between the first sealing cover (341) and the fixed ring (31), the first hinge piece (342) can connect the first sealing cover (341) on the fixed ring (31), two positioning assemblies (343) are connected on the fixed ring (31), and the positioning assemblies (343) can position the first sealing cover (341).

4. A rotary kiln calcination limestone strength detection apparatus according to claim 3, wherein: the first hinge piece (342) comprises two first protruding blocks (3421), a first rotating rod (3422) is rotatably connected between the two first protruding blocks (3421), a first connecting plate (3423) is connected to the outer side of the first rotating rod (3422), one end of the first connecting plate (3423) is connected with a first sealing cover (341), and the first sealing cover (341) can be turned up and down by taking the first rotating rod (3422) as an axle center.

5. A rotary kiln calcination limestone strength detection apparatus according to claim 3, wherein: the positioning assembly (343) comprises a shell (3431), an opening (34311) and a clamping groove (34312) are formed in the front side of the shell (3431), a positioning plate (3432) is inserted into one side, close to the first sealing cover (341), of the fixing ring (31), the positioning plate (3432) can position the first sealing cover (341), an elastic piece (3433) is fixed on one side, far away from the first sealing cover (341), of the positioning plate (3432), a hinge plate (3434) is hinged to the front side of the positioning plate (3432), a front end penetrating opening (34311) of the hinge plate (3434) is formed in the mode that the hinge plate (3434) pulls the positioning plate (3432) to be rotatably clamped into the clamping groove (34312) after being separated from the first sealing cover (341), and therefore the positioning plate (3432) is positioned.

6. The limestone strength detection device for rotary kiln calcination according to claim 2, wherein: the discharging sealing cover assembly (35) comprises a second sealing cover (351), a second hinge piece (352) is connected between the second sealing cover (351) and the fixed ring (31), a driving assembly (353) is connected to the second hinge piece (352), the second hinge piece (352) can enable the second sealing cover (351) to be hinged to the bottom of the fixed ring (31), and the driving assembly (353) can drive the second hinge piece (352) to drive the second sealing cover (351) to automatically turn over.

7. The limestone strength testing device for rotary kiln calcination as claimed in claim 6, wherein: the second hinge (352) include two second lugs (3521), two rotate between second lugs (3521) and be connected with second dwang (3522), the outside of second dwang (3522) is connected with second connecting plate (3523), the one end and the second closing cap (351) of second connecting plate (3523) are connected, second dwang (3522) runs through two second lugs (3521), both ends of second dwang (3522) all are connected with driven gear (3524), second closing cap (351) can use second dwang (3522) as the axle center upset around.

8. The limestone strength testing device for rotary kiln calcination as claimed in claim 7, wherein: the driving assembly (353) comprises an electric telescopic rod (3532), a telescopic end of the electric telescopic rod (3532) is connected with a moving plate (3533), two toothed plates (3534) are connected to the moving plate (3533), the two toothed plates (3534) are respectively meshed with two driven gears (3524), the electric telescopic rod (3532) can drive the toothed plates (3534) to move back and forth, so that the toothed plates (3534) drive the driven gears (3524) to rotate, and the driven gears (3524) drive the second rotating rod (3522) to rotate when rotating.

9. The limestone strength detection device for rotary kiln calcination according to claim 1, wherein: the heating mechanism (2) comprises a combustor (22), one end of the combustor (22) is connected with a gas pipe (23) and a combustion air pipe (24), the gas pipe (23) can convey gas into the combustor (22), the combustor (22) can ignite the gas to form flame, and the combustion air pipe (24) can convey combustion-supporting air into the combustor (22).

10. A limestone strength testing device for rotary kiln calcination according to any one of claims 1 to 9, wherein: the rotary drum (1) comprises two rotating rings (12) and a driving motor (17), wherein the outer sides of the two rotating rings (12) are respectively connected with an outer tooth ring (16), a transmission rod (18) is connected to an output shaft of the driving motor (17), two driving gears (19) are connected to the transmission rod (18), the two driving gears (19) are respectively connected with the two outer tooth rings (16) in a meshed mode, and the driving motor (17) can drive the two driving gears (19) and the two outer tooth rings (16) to realize meshed transmission, so that the two rotating rings (12) are driven to rotate in the same direction at the same time.