A cement ball mill

Abstract

The present invention relates to the technical field of cement ball mills, and discloses a cement ball mill, the cement ball mill comprising an equipment body, the equipment body comprising a base frame, and a drum is arranged on the base frame; a plurality of lining plates are also arranged in the drum, and a conversion mechanism is arranged on the lining plate; the conversion mechanism comprises a flip frame installed on the lining plate, a ball collecting plate is installed on the side of the flip frame away from the lining plate, and a plurality of ball grooves are opened in the ball collecting plate, and an electromagnetic plate is installed in the ball groove. The present invention collects the steel balls in the drum through the electromagnetic plate, so that the steel balls enter the cavity for storage, and divides the lining plate in the drum into two groups for independent control, and respectively controls the electromagnetic plates on the ball collecting plates to magnetize or demagnetize the electromagnetic plates, thereby controlling the number of steel balls in the drum, thereby eliminating the need for manual adjustment of the steel balls, and improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cement ball mills, and more particularly to a cement ball mill. Background Art

[0002] Ball mill is the key equipment for crushing materials after they are broken. This type of grinding mill has a certain number of steel balls as grinding media in its cylinder. It is widely used in cement, silicate products, etc. Cement ball mill generally grinds cement raw materials through the impact and friction between grinding balls. The centrifugal force generated by the rotation of the cylinder brings the steel balls to a certain height and then falls, which has an impact and grinding effect on the materials.

[0003] In the prior art, the adjustment of the grinding fineness and coarseness of the ball mill has a direct impact on the quality and use effect of the product. Among them, the ratio of abrasive to grinding medium has a direct effect on the fineness and coarseness. If the abrasive ratio is high, the fineness is low and the coarseness is high; if the grinding medium ratio is high, the fineness is high and the coarseness is low. However, in the processing of cement raw materials, different types of raw materials have different particle size requirements. After completing the grinding of one of the raw materials, manual intervention is required to manually adjust the number of steel balls inside the ball mill to meet the grinding requirements of other raw materials, which not only increases the complexity of the work, but also affects the work efficiency. Summary of the invention

[0004] The present invention provides a cement ball mill, which solves the technical problem in the related art that different types of raw materials have different particle size requirements, and after grinding one of the raw materials, manual intervention is required to manually adjust the number of steel balls inside the ball mill, which affects the work efficiency.

[0005] The present invention provides a cement ball mill, comprising an equipment body, the equipment body comprising a base frame, and a drum is arranged on the base frame, end covers are installed at both ends of the drum, and a shaft cylinder is installed on the end cover, and the shaft cylinder is connected to the base frame through a support seat, and a motor and a reducer are also installed on the base frame; a plurality of lining plates are also arranged in the drum, and a conversion mechanism is arranged on the lining plate; the conversion mechanism comprises a turning frame installed on the lining plate, and a shaft rod is installed on the turning frame, a ball collecting plate is installed on the side of the turning frame away from the lining plate, and a plurality of ball grooves are opened in the ball collecting plate, and an electromagnetic plate is installed in the ball groove.

[0006] As a further optimization scheme of the present invention, mounting plates are installed on both sides of the drum, bearings on the mounting plates on both sides are connected to first gear rings, and multiple first gears are meshed and connected inside the first gear rings, and the first gears are installed on the shaft.

[0007] As a further optimization scheme of the present invention, the sum of the number of the first gears on both sides is the same as the number of shaft rods, and the lining plates in the drum are independently controlled using two sets of first gear rings.

[0008] As a further optimization scheme of the present invention, partitions are also installed at both ends of the drum, and a motor is installed on the partition, a second gear is installed at the output shaft of the motor, a first rack plate is meshed and connected to the second gear, and the first rack plate is fixedly connected to the first gear ring.

[0009] As a further optimization scheme of the present invention, clamping claws are provided on both sides of the ball groove, and the clamping claws are arranged in an arc shape, connecting shafts are connected to the ball collecting plate by bearings on both sides, and the connecting shafts are fixedly connected to the clamping claws, both sides of each end of the ball collecting plate are rotatably connected to the first electric push rod through a rotating shaft, and a swing arm is rotatably connected to the telescopic end of the first electric push rod through a rotating shaft, and the end of the swing arm away from the first electric push rod is fixedly connected to the connecting shaft.

[0010] As a further optimization solution of the present invention, the lining plates are distributed in a ring array, and a closed cavity is formed between the drum and the lining plates.

[0011] As a further optimization scheme of the present invention, an annular tube is installed in the cavity, and a plurality of spraying tubes are installed on the annular tube, so as to facilitate the cleaning of the steel ball and remove impurities on the surface of the steel ball.

[0012] As a further optimization scheme of the present invention, a first connecting pipe and a second connecting pipe are installed on the drum. The first connecting pipe is connected to the inside of the annular pipe to supply water to the annular pipe. The second connecting pipe is used to connect to an external pipeline to facilitate the discharge of waste liquid after internal cleaning.

[0013] As a further optimization scheme of the present invention, a limit frame is provided between every two flip frames for supporting and limiting the lining plate, and a traction mechanism is provided between the limit frame and the roller, and the traction mechanism includes a rotating ring connected to both sides of the outer wall of the roller by bearings, and a plurality of inclined blocks are installed on the rotating ring, the inclined blocks are slidably connected to the guide rod, and the guide rod is installed with a connecting rod, the connecting rod is installed on the limit frame, and a spring is also provided on the connecting rod.

[0014] As a further optimization scheme of the present invention, a second gear ring is also installed on the rotating ring, and a second rack plate is meshed and connected to the second gear ring, a second electric push rod is provided on the second rack plate, and a mounting frame is connected to the second electric push rod, and the mounting frame is installed on the drum.

[0015] The beneficial effects of the present invention are as follows: the present invention collects the steel balls in the drum through the electromagnetic plate, and after the collection is completed, the flip plate is controlled to rotate, and the lining plate and the ball collecting plate are reset, so that the steel balls enter the cavity for storage, and the lining plate in the drum is divided into two groups for independent control, and the electromagnetic plates on the ball collecting plates are powered on and controlled respectively, so that the electromagnetic plates are magnetized or demagnetized, thereby controlling the number of steel balls in the drum, thereby eliminating the need for manual adjustment of the steel balls and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 It is a schematic cross-sectional view of the structure of the present invention;

[0018] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0019] Figure 4 It is a three-dimensional exploded structural diagram of the roller, conversion mechanism and traction mechanism of the present invention;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the drum of the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the conversion mechanism of the present invention;

[0022] Figure 7 The present invention Figure 6 A magnified view of the structure at center;

[0023] Figure 8 The present invention Figure 6 A magnified view of the structure at B in the middle;

[0024] Fig. 9 It is a schematic diagram of the three-dimensional structure of the traction mechanism of the present invention;

[0025] Fig.10 It is a cross-sectional structural schematic diagram of the roller, the conversion mechanism and the traction mechanism of the present invention;

[0026] Fig.11 The present invention Fig.10 A schematic diagram of a partial cross-sectional structure;

[0027] Fig.12 It is a schematic diagram of the structure of the first working state of the present invention;

[0028] Fig.13 It is a schematic diagram of the structure of the second working state of the present invention.

[0029] In the figure: 100, equipment body; 101, base frame; 102, roller; 103, end cover; 104, shaft cylinder; 105, support seat; 106, motor; 107, reducer; 108, first discharge port; 109, guide channel; 110, second discharge port; 111, spiral conveying blade; 1021, mounting plate; 1022, partition; 1023, first connecting pipe; 1024, second connecting pipe; 200, conversion mechanism; 201, lining plate; 202, turning frame; 203, shaft rod; 204, ball collecting plate; 205, ball groove; 206, electric Magnetic plate; 207, limit frame; 208, first gear; 209, first gear ring; 210, motor; 211, second gear; 212, first rack plate; 213, clamping claw; 214, connecting shaft; 215, first electric push rod; 216, swing arm; 217, annular tube; 218, spraying tube; 300, traction mechanism; 301, rotating ring; 302, inclined block; 303, guide rod; 304, connecting rod; 305, second gear ring; 306, second rack plate; 307, second electric push rod; 308, mounting frame; 400, cavity; S, steel ball. DETAILED DESCRIPTION

[0030] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0031] Please see attached Figure 1 A cement ball mill includes a device body 100, the device body 100 includes a base frame 101, and a drum 102 is arranged on the base frame 101, both ends of the drum 102 are installed with end covers 103, and a shaft cylinder 104 is installed on the end cover 103, and the shaft cylinder 104 is connected with the inside of the drum 102. In this embodiment, the cement raw material is raw materials such as limestone, iron ore or slag. A bearing on the shaft cylinder 104 is connected with a support seat 105, and the support seat 105 is installed on the base frame 101, and a motor 106 and a reducer 107 are also installed on the base frame 101, and the output shaft of the motor 106 is connected to the reducer 107, and the output shaft of the reducer 107 is connected to one of the shaft cylinders 104.

[0032] It should be understood that when the driving motor 106 rotates, the drum 102 rotates, and the rotation of the drum 102 drives the cement raw materials inside and the steel balls S to rotate synchronously. The steel balls S revolve around the axis of the drum 102. When the steel balls S are brought to a certain height, they fall due to their own weight, thereby exerting a strong impact on the ore raw materials in the drum 102 and crushing the ore.

[0033] For details, please refer to the attached Figure 2 and attached Figure 3 , the shaft cylinder 104 at one end away from the motor 106 is the feeding end, and the shaft cylinder 104 at one end close to the motor 106 is the unloading end, so as to be used for crushing the cement raw materials in the drum 102. In this embodiment, the shaft cylinder 104 as the unloading end is provided with a first discharge port 108 and a second discharge port 110. Through the setting of the first discharge port 108 and the second discharge port 110, the raw materials can be discharged quickly, so as to avoid the accumulation of raw materials and blockage during unloading. One of the end covers 103 is provided with a guide channel 109 corresponding to the first discharge port 108, so as to facilitate the directional guidance of the crushed raw materials discharged from the first discharge port 108, so as to facilitate the delivery of the discharged cement raw materials to the next step for screening and processing. Among them, spiral conveying blades 111 are installed in both shaft cylinders 104 to facilitate the transportation of the raw materials in the shaft cylinder 104 and avoid the accumulation of raw materials.

[0034] For further information, please see the attached Figure 2 , a plurality of lining plates 201 are further provided in the drum 102, and the lining plates 201 are distributed in an annular array, and a closed cavity 400 is formed between the drum 102 and the lining plates 201, so that the drum 102 and the lining plates 201 distributed in an annular array form a noise reduction sandwich structure. In this embodiment, the cavity 400 provides a buffer area, which can reduce the direct contact between the drum 102 and the lining plates 201, thereby reducing the noise generated by impact and vibration, and effectively solves the problem that when the cement ball mill is running in the prior art, the steel balls S and the crushed raw materials need to continuously rotate inside, resulting in a high noise problem in the factory during continuous processing operations, and long-term exposure to high-decibel noise may cause hearing loss of the operating workers, and in a high-noise environment, the workers may not be able to hear important safety warnings or instructions, increasing the risk of accidents.

[0035] Please see attached Figure 4 To Attachment Figure 8 , and attached Fig.10 and attached Fig.11, mounting plates 1021 are installed on both sides of the inside of the drum 102, and a conversion mechanism 200 is provided between the mounting plate 1021 and the lining plate 201, the conversion mechanism 200 includes a flip frame 202 installed on the lining plate 201, and an axle rod 203 is installed on the flip frame 202, both ends of the axle rod 203 are connected to the bearings of the mounting plate 1021, a ball collecting plate 204 is installed on the side of the flip frame 202 away from the lining plate 201, and a plurality of ball grooves 205 are opened in the ball collecting plate 204, and an electromagnetic plate 206 is installed in the ball groove 205.

[0036] It should be noted that when the shaft 203 drives the turning frame 202 to rotate, the positions of the lining plate 201 and the ball collecting plate 204 are swapped, and the lining plate 201 is placed in the cavity 400, so that the ball collecting plate 204 can collect the steel balls S in the drum 102. Through the setting of the electromagnetic plate 206, it is convenient to magnetically connect the steel balls S in the ball groove 205, and limit and fix the steel balls S.

[0037] When collecting the steel balls S, the electromagnetic plate 206 is energized to generate an electromagnetic force in coordination with the rotation of the drum 102. The steel balls S in the drum 102 move as the drum 102 rotates. The steel balls S enter the ball groove 205 under the guidance of the ball groove 205. The electromagnetic plate 206 adsorbs the steel balls S so that the steel balls S are fixed by the ball groove 205. As the drum 102 rotates continuously, the internal steel balls S are sequentially added to the ball groove 205 for fixation, and the steel balls S in the drum 102 are collected. After the steel balls S are collected, the flip plate is controlled to rotate so that the lining plate 201 and the ball collecting plate 204 are reset, so that the steel balls S enter the cavity 400 for storage.

[0038] For details, please refer to the attached Figure 6 and attached Figure 7 , the first gear rings 209 are connected to the bearings on the mounting plates 1021 on both sides, and a plurality of first gears 208 are meshed and connected in the first gear rings 209, and the first gears 208 are mounted on the shafts 203. Among them, each shaft 203 is mounted with a set of first gears 208, and the sum of the number of the first gears 208 on both sides is the same as the number of the shafts 203. In other words, please refer to the attached Figure 6 When there are twenty-four groups of shaft rods 203 , twelve groups of shaft rods 203 are connected to the first gear 208 at one end away from the motor 106 , and the other twelve groups of shaft rods 203 are connected to the first gear 208 at one end close to the motor 106 .

[0039] Please see the attached Figure 8, partitions 1022 are also installed at both ends of the drum 102, and a motor 210 is installed on the partition 1022, and a second gear 211 is installed at the output shaft of the motor 210, and a first rack plate 212 is meshed and connected to the second gear 211, and the first rack plate 212 is fixedly connected to the first gear ring 209. In this embodiment, the first rack plate 212 is set in an arc shape. When the driving motor 210 rotates, the second gear 211 drives the first rack plate 212 to rotate, thereby controlling the first gear ring 209 to rotate. When the first gear ring 209 is meshed and connected with the first gear 208, the control shaft 203 rotates, thereby driving the lining plate 201 and the ball collecting plate 204 to switch between use.

[0040] For further information, please see the attached Figure 7 and attached Figure 8 , claws 213 are provided on both sides of the ball groove 205, and the claws 213 are arranged in an arc shape, and the connecting shaft 214 is connected to the claws 213 by bearings on both sides of the ball collecting plate 204, and the connecting shaft 214 is fixedly connected to the claws 213, and the two sides of each end of the ball collecting plate 204 are rotatably connected to the first electric push rod 215 through a rotating shaft, and the telescopic end position of the first electric push rod 215 is rotatably connected to a swing arm 216 through a rotating shaft, and the end of the swing arm 216 away from the first electric push rod 215 is fixedly connected to the connecting shaft 214.

[0041] It should be understood that when the first electric push rod 215 performs telescopic movement, the swing arm 216 is controlled to perform reciprocating movement, thereby controlling the clamping jaw 213 to open or close.

[0042] When the steel ball S is in the cavity 400, the first electric push rod 215 drives the swing arm 216 to move, and controls the clamping claws 213 to clamp and fix the two sides of the steel ball S, so that the steel ball S can be stably fixed in the ball groove 205. At this time, the power to the electromagnetic plate 206 can be released, which can effectively save electricity costs and make the limiting effect more stable.

[0043] For further information, please see the attached Fig.11 An annular tube 217 is installed in the cavity 400, and a plurality of spraying tubes 218 are installed on the annular tube 217, so as to facilitate the cleaning of the steel ball S and remove impurities on the surface of the steel ball S.

[0044] It should be noted that a first connecting pipe 1023 and a second connecting pipe 1024 are installed on the drum 102. The first connecting pipe 1023 is connected to the inside of the annular pipe 217 to supply water to the annular pipe 217. The second connecting pipe 1024 is used to connect to an external pipeline to facilitate the discharge of waste liquid after internal cleaning.

[0045] When the steel ball S is inside the cavity 400, it is connected to the inside of the annular tube 217 through the first connecting tube 1023, and the first connecting tube 1023 is connected to the water supply pipe to supply water to the annular tube 217, and the water is discharged from the spraying pipe 218 to wash the surface of the steel ball S, thereby effectively removing impurities and dust accumulated on the surface of the steel ball S, thereby preventing the impurities on the steel ball S from chemically reacting with other raw materials when crushing different raw materials. At the same time, the problem of manual cleaning of the steel ball S and low efficiency is avoided.

[0046] Please see attached Figure 7 To Attachment Fig.11 A limiting frame 207 is provided between each two turning frames 202 for supporting and limiting the lining plate 201. A traction mechanism 300 is provided between the limiting frame 207 and the roller 102. The traction mechanism 300 includes a rotating ring 301 connected to both sides of the outer wall of the roller 102 by a bearing, and a plurality of inclined blocks 302 are installed on the rotating ring 301. The number of the inclined blocks 302 is the same as the number of the limiting frames 207. The inclined blocks 302 are slidably connected to the guide rods 303, and the guide rods 303 are installed with connecting rods 304. The connecting rods 304 are installed on the limiting frames 207. Please refer to the attached Fig.11 A spring is also provided on the connecting rod 304, and one end of the spring is installed on the limit frame 207, and the other end is installed on the inner wall of the cavity 400. Through the setting of the spring, the limit frame 207 can be reset under the action of the elastic restoring force, thereby sealing between the lining plates 201.

[0047] For details, please refer to the attached Fig. 9 and attached Fig.10 A second gear ring 305 is also installed on the rotating ring 301, and the second gear ring 305 is meshed with a second rack plate 306, the second rack plate 306 is provided with a second electric push rod 307, and the second electric push rod 307 is connected to a mounting frame 308, and the mounting frame 308 is installed on the drum 102.

[0048] When the second electric push rod 307 performs telescopic movement, the second rack plate 306 is controlled to perform telescopic movement. Under the action of the meshing connection between the second gear ring 305 and the second rack plate 306, the rotating ring 301 is driven to rotate, so that the inclined block 302 performs synchronous movement.

[0049] When the inclined block 302 rotates, the guide rod 303 on the inclined block 302 is controlled to slide on the inclined block 302, so that the connecting rod 304 controls the limiting frame 207 to move, releases the limiting and supporting of the flip frame 202, and facilitates driving the flip frame 202 to flip.

[0050] Furthermore, the gap between the two sets of lining plates 201 is filled by the limiting frame 207, so that when the internal raw materials are crushed, the internal raw materials are prevented from slipping out of the gap. At the same time, the lining plates 201 are supported, so that when the internal raw materials are crushed, the lining plates 201 are connected stably, and the shaft rod 203 is protected to prevent the shaft rod 203 from deformation.

[0051] Please note that please refer to the attached Fig.12 and attached Fig.13 When one of the first gear rings 209 rotates, the first gear 208 inside it is driven to rotate, so that the shaft 203 connected thereto rotates, thereby turning over a part of the turning frame 202 inside the drum 102, and exchanging the positions of the lining plate 201 and the ball collecting plate 204.

[0052] When another set of first gear rings 209 rotates, the first gear 208 therein is driven to rotate, so that the shaft 203 connected thereto rotates, thereby turning over the flip frame 202 in another part of the drum 102, and exchanging the positions of the lining plate 201 and the ball collecting plate 204.

[0053] That is to say, the lining plate 201 in the drum 102 is divided into two groups for independent control, so as to facilitate the adjustment of the number of steel balls S in the drum 102, and the electromagnetic plate 206 on the ball collecting plate 204 is powered on and controlled respectively, so that the electromagnetic plate 206 is magnetized or demagnetized, thereby controlling the number of steel balls S in the drum 102.

[0054] Furthermore, by dividing the lining plates 201 in the drum 102 into two groups for independent control, when one group of independently controlled lining plates 201 moves upward, the first gear ring 209 and the first gear 208 are meshed and connected to control the lining plates 201 to flip, so that the lining plates 201 are reset. At this time, the other group of independently controlled lining plates 201 at the bottom remains stationary, thereby preventing the steel ball S from sliding into the cavity 400 from the bottom.

[0055] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present embodiment.

Claims

1. A cement ball mill, characterized in that: include: A device body (100), the device body (100) comprising a base frame (101), a roller (102) being provided on the base frame (101), end covers (103) being installed at both ends of the roller (102), a shaft cylinder (104) being installed on the end cover (103), the shaft cylinder (104) being connected to the base frame (101) via a support seat (105), and a motor (106) and a reducer (107) being installed on the base frame (101); A plurality of lining plates (201) are further provided in the drum (102), and a conversion mechanism (200) is provided on the lining plates (201); The conversion mechanism (200) comprises a turning frame (202) mounted on a lining plate (201), wherein a shaft (203) is mounted on the turning frame (202), a ball collecting plate (204) is mounted on a side of the turning frame (202) away from the lining plate (201), and a plurality of ball grooves (205) are formed in the ball collecting plate (204), wherein an electromagnetic plate (206) is mounted in the ball grooves (205); Mounting plates (1021) are installed on both sides of the drum (102), first gear rings (209) are connected to the bearings on the mounting plates (1021) on both sides, and a plurality of first gears (208) are meshedly connected inside the first gear rings (209), and the first gears (208) are installed on the shaft (203); Both ends of the drum (102) are further provided with partitions (1022), and a motor (210) is installed on the partition (1022); a second gear (211) is installed at the output shaft of the motor (210), a first rack plate (212) is meshedly connected to the second gear (211), and the first rack plate (212) is fixedly connected to the first gear ring (209); Clamping claws (213) are provided on both sides of the ball groove (205), and the clamping claws (213) are arranged in an arc shape. Connecting shafts (214) are connected to the ball collecting plate (204) via bearings on both sides inside the ball collecting plate (204), and the connecting shaft (214) is fixedly connected to the clamping claws (213). Both sides of each end of the ball collecting plate (204) are rotatably connected to a first electric push rod (215) via a rotating shaft, and a swing arm (216) is rotatably connected to the telescopic end of the first electric push rod (215) via a rotating shaft, and one end of the swing arm (216) away from the first electric push rod (215) is fixedly connected to the connecting shaft (214).

2. A cement ball mill according to claim 1, characterized in that: The sum of the number of the first gears (208) on both sides is the same as the number of the shafts (203), and the lining plate (201) in the drum (102) is independently controlled using two sets of first gear rings (209).

3. A cement ball mill according to claim 1, characterized in that: The lining plates (201) are distributed in a ring array, and a closed cavity (400) is formed between the roller (102) and the lining plates (201).

4. A cement ball mill according to claim 3, characterized in that: An annular tube (217) is installed in the cavity (400), and a plurality of spray tubes (218) are installed on the annular tube (217), thereby facilitating the cleaning of the steel ball (S) and removing impurities on the surface of the steel ball (S).

5. A cement ball mill according to claim 4, characterized in that: The drum (102) is provided with a first connecting pipe (1023) and a second connecting pipe (1024); the first connecting pipe (1023) is connected to the inside of the annular pipe (217) so as to supply water to the inside of the annular pipe (217); the second connecting pipe (1024) is used to connect to an external pipeline so as to facilitate the discharge of waste liquid after cleaning the inside.

6. A cement ball mill according to claim 1, characterized in that: A limiting frame (207) is provided between every two turning frames (202) for supporting and limiting the lining plate (201); a traction mechanism (300) is provided between the limiting frame (207) and the roller (102); the traction mechanism (300) comprises a rotating ring (301) connected to both sides of the outer wall of the roller (102) by bearings; a plurality of inclined blocks (302) are installed on the rotating ring (301); a guide rod (303) is slidably connected to the inclined block (302); a connecting rod (304) is installed on the guide rod (303); the connecting rod (304) is installed on the limiting frame (207); and a spring is also provided on the connecting rod (304).

7. A cement ball mill according to claim 6, characterized in that: A second gear ring (305) is also mounted on the rotating ring (301), and a second rack plate (306) is meshedly connected to the second gear ring (305), a second electric push rod (307) is provided on the second rack plate (306), and a mounting frame (308) is connected to the second electric push rod (307), and the mounting frame (308) is mounted on the drum (102).

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