High-purity manganese carbonate preparation device

Abstract

The invention relates to the technical field of chemical material preparation, in particular to a high-purity manganese carbonate preparation device which comprises a carbon reaction tank, a tank cover, a driving assembly, a first hollow shaft, a second hollow shaft, a gas guide pipe, a cylindrical isolation hood, a supporting column, a circulating stirring mechanism, a gas supply assembly and a smashing mechanism. The driving assembly drives the first hollow shaft and the second hollow shaft to rotate, the first hollow shaft drives the circulating stirring mechanism to operate, and the second hollow shaft supplies carbon dioxide into the tank through the gas supply assembly. The smashing mechanism is arranged between the stirring mechanism and the gas supply assembly and breaks the carbon dioxide bubbles to increase the gas-liquid contact area. The circulating stirring mechanism comprises an auger blade and a stirring blade, so that circulating flow of the raw material liquid is realized; the gas supply assembly comprises a flow dividing disc, an annular gas guide pipe and a guide pipe, and precise gas supply is achieved. And the driving assembly realizes double-shaft independent control. The device is uniform in gas-liquid mixing and sufficient in reaction, can improve the product purity and the production efficiency, and is suitable for industrial preparation of high-purity manganese carbonate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical material preparation, in particular to a high-purity manganese carbonate preparation device. BACKGROUND

[0002] High-purity manganese carbonate refers to manganese carbonate powder with a purity of greater than or equal to 99.9%, which is widely used in fields such as lithium ion battery positive electrode materials, high-end magnetic materials and precise catalytic materials as a key chemical raw material. The purity of the high-purity manganese carbonate directly determines the performance and service life of the end product.

[0003] The preparation process of the existing high-purity manganese carbonate generally comprises core links such as raw material dissolution, multi-stage purification and impurity removal, carbonation reaction, solid-liquid separation and drying. The carbonation reaction is a key step for generating manganese carbonate precipitate. In this step, carbon dioxide gas is introduced into the purified manganese salt solution (such as manganese sulfate solution) to generate manganese carbonate precipitate through gas-liquid reaction. At present, the general reaction tank is generally used to complete the carbonation reaction. The structure design of the general reaction tank is not optimized for the special requirements of high-purity manganese carbonate preparation, and the following shortcomings exist: The general reaction tank usually uses a single pipeline for gas supply, and the bubble particle size is large (usually greater than or equal to 1 mm), which leads to a small gas-liquid contact area. At the same time, the stirring mechanism is usually designed with a single blade, the liquid circulation is not smooth, the bubbles are easy to gather and float, and the residence time is short, which leads to incomplete carbonation reaction, low manganese ion conversion rate, and uneven local reaction concentration, which easily produces impurity precipitate and affects the product purity. SUMMARY

[0004] The purpose of the present application is to provide a high-purity manganese carbonate preparation device to solve the problems in the background art.

[0005] The purpose of the present application can be achieved by the following technical solutions: A high-purity manganese carbonate preparation device comprises a carbon reaction tank, the top end of the carbon reaction tank is provided with a tank cover, the bottom end of the carbon reaction tank is provided with a discharge port, the tank cover is provided with a feeding port and a pressure relief port, the top surface of the tank cover is fixedly installed with a mounting seat, and the device further comprises: A driving assembly fixedly installed on the mounting seat; A hollow shaft one rotatingly penetrating the mounting seat and in transmission connection with the driving assembly; A hollow shaft two rotatingly penetrating the hollow shaft one and in transmission connection with the driving assembly, the top end of the hollow shaft two is connected with a rotatable gas guide pipe through a rotating pipe connecting piece, and the gas guide pipe is connected with an external carbon dioxide supply device; A cylindrical isolation cover fixedly installed in the carbon reaction tank, the cylindrical isolation cover is coaxially arranged with the carbon reaction tank, and a plurality of supporting columns are fixedly connected between the bottom surface of the cylindrical isolation cover and the inner bottom surface of the carbon reaction tank; A circulating stirring mechanism is arranged in the cylindrical isolation cover; A gas supply assembly is arranged at the bottom end of the cylindrical isolation cover, which is through the bottom end of the hollow shaft two, and is used to supply carbon dioxide into the carbon reaction tank. And a crushing mechanism is arranged between the stirring mechanism and the gas supply assembly, which is used to break the carbon dioxide bubbles to increase the gas-liquid contact area.

[0006] Further, the circulating stirring mechanism includes auger blades fixedly installed on the periphery of the hollow shaft one, and the outer edges of the auger blades are in sliding contact with the inner wall of the cylindrical isolation cover. Further, the circulating stirring mechanism includes a plurality of stirring blades fixedly installed on the periphery of the hollow shaft one, and the plurality of stirring blades are arranged along the helical track of the auger blades on the periphery of the hollow shaft one.

[0007] Further, the crushing mechanism includes a driving gear and a plurality of crushing assemblies, and the driving gear is fixedly installed on the periphery of the hollow shaft one near the bottom end. The plurality of crushing assemblies are fixedly installed on the inner wall of the cylindrical isolation cover, and the plurality of crushing assemblies are circumferentially arranged about the axis of the cylindrical isolation cover, and each of the plurality of crushing assemblies is in transmission connection with the driving gear. The side surface of the driving gear is hollow.

[0008] Further, the crushing assembly includes a boss fixedly installed on the inner wall of the cylindrical isolation cover, a bearing seat fixedly installed at the front end of the boss, a transmission shaft rotatably installed through the bearing seat, a driven gear fixedly installed at the bottom end of the transmission shaft and engaged with the driving gear, and a crushing impeller fixedly installed at the bottom end of the transmission shaft.

[0009] Further, the gas supply assembly includes a flow distribution disc fixedly installed through the bottom end of the hollow shaft two, the flow distribution disc is a hollow structure, an annular gas guide tube is coaxially sleeved on the periphery of the flow distribution disc, a plurality of uniformly distributed gas outlet holes are formed on the periphery of the annular gas guide tube, the diameter of the annular gas guide tube is equal to the distance from the axis of the bearing seat to the axis of the cylindrical isolation cover. A plurality of axially arrayed conduits are fixedly connected through the periphery of the flow distribution disc and the annular gas guide tube.

[0010] Further, the driving assembly includes a mounting bracket, a driven pulley one and a driven pulley two, the driven pulley one is fixedly installed at the top end position of the periphery of the hollow shaft one, and the driven pulley two is fixedly installed at the top end position of the periphery of the hollow shaft two. The mounting bracket is fixedly installed with a motor one and a motor two, the output shaft of the motor one is fixedly installed with a driving pulley one, and the driving pulley one and the driven pulley one are installed with a belt one. The output shaft end of the motor two is fixedly provided with a driving pulley two, and the driving pulley two and a driven pulley two are provided with a belt two.

[0011] The beneficial effects of the present application are: 1、The present application breaks the gas bubble to micron level through the dynamic gas supply of the annular gas guide pipe, the linkage crushing of multiple crushing assemblies, and the synergistic design of the composite flow field of the auger blade and the stirring blade, so that the gas-liquid contact area is significantly improved compared with the general reaction tank, and the problems of large gas bubble and insufficient contact of the general reaction tank are solved.

[0012] 2、The setting of the cylindrical isolation cover and the auger blade in the present application forms a circulating flow channel, prolongs the gas bubble residence time, makes the carbon dioxide and manganese ions fully react, avoids local concentration unevenness, and meets the requirements of high-end fields for high-purity manganese carbonate.

[0013] 3、The present application adopts the double-shaft design of the hollow shaft one and the hollow shaft two, realizes independent regulation and control of stirring, crushing and gas supply, and can flexibly adjust the operation parameters according to the production requirements. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings; Figure 1 is a three-dimensional schematic view of the overall structure of the present application; Figure 2 is a three-dimensional schematic view of the internal structure of the present application; Figure 3 is Figure 2 is an enlarged view of part A in the figure; Figure 4 is a three-dimensional schematic view of the crushing mechanism and the gas supply assembly in the present application; Figure 5 is Figure 4 is a three-dimensional schematic view from another angle; Figure 6 is Figure 4 is an enlarged view of part B in the figure; The reference signs in the figure are as follows: 1-carbon reaction tank, 2-tank cover, 3-charge port, 4-pressure relief port, 5-driving assembly, 6-mounting seat, 7-hollow shaft one, 8-hollow shaft two, 9-air guide pipe, 10-discharge port, 11-cylindrical isolation cover, 12-auger blade, 13-stirring blade, 14-pulverizing mechanism, 15-gas supply assembly, 16-mounting frame, 17-motor one, 18-driving pulley one, 19-belt one, 20-driven pulley one, 21-motor two, 22-driving pulley two, 23-belt two, 24-driven pulley two, 25-driving gear, 26-supporting column, 27-crushing assembly, 28-annular air guide pipe, 29-air outlet hole, 30-conduit, 31-flow dividing disc, 32-driven gear, 33-convex seat, 34-bearing seat, 35-crushing impeller, 36-transmission shaft. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0016] Embodiment 1: please refer to Figure 1 and Figure 2 In the embodiments of the present application, a high-purity manganese carbonate preparation device comprises a carbon reaction tank 1, the top end of the carbon reaction tank 1 is provided with a tank cover 2, the bottom end of the carbon reaction tank 1 is provided with a discharge port 10, the tank cover 2 is provided with a charge port 3 and a pressure relief port 4, the top surface of the tank cover 2 is fixedly installed with a mounting seat 6, and the device further comprises: a driving assembly 5 fixedly installed on the mounting seat 6; a hollow shaft one 7 rotatably penetrating through the mounting seat 6, the hollow shaft one 7 being in transmission connection with the driving assembly 5; a hollow shaft two 8 rotatably penetrating through the hollow shaft one 7, the hollow shaft two 8 being in transmission connection with the driving assembly 5, and the top end of the hollow shaft two 8 being connected with a rotatable air guide pipe 9 through a rotating pipe connecting piece, the air guide pipe 9 being connected with an external carbon dioxide supply device; a cylindrical isolation cover 11 fixedly installed in the carbon reaction tank 1, the cylindrical isolation cover 11 being coaxially arranged with the carbon reaction tank 1, and a plurality of supporting columns 26 being fixedly connected between the bottom surface of the cylindrical isolation cover 11 and the inner bottom surface of the carbon reaction tank 1; a circulating stirring mechanism arranged in the cylindrical isolation cover 11; a gas supply assembly 15 arranged at the bottom end position of the cylindrical isolation cover 11, the gas supply assembly 15 penetrating through the bottom end of the hollow shaft two 8, and the gas supply assembly 15 being used for supplying carbon dioxide into the carbon reaction tank 1; And a crushing mechanism 14 arranged between the stirring mechanism and the gas supply assembly 15, for breaking the carbon dioxide bubbles to increase the gas-liquid contact area.

[0017] In use, the application has the advantages that: The manganese salt raw material liquid after pre-stage multi-stage purification is continuously fed into the carbon reaction tank 1 through the feeding port 3 until the set liquid level is reached; the driving assembly 5 is started, and the hollow shaft one 7 and the hollow shaft two 8 are driven to rotate synchronously, the hollow shaft one 7 drives the circulating stirring mechanism to operate, and the raw material liquid is stirred; at the same time, the external carbon dioxide supply device supplies carbon dioxide to the hollow shaft two 8 through the gas guide pipe 9, and the gas is sprayed into the raw material liquid in the form of bubbles at the bottom end of the cylindrical isolation cover 11 through the gas supply assembly 15; The crushing mechanism 14 is synchronously driven to operate during the rotation of the hollow shaft one 7, the carbon dioxide bubbles floating up are broken, the bubble particle size is reduced, the gas-liquid contact area is significantly increased, and the carbon dioxide and manganese ions fully react to generate manganese carbonate precipitate; After the reaction is completed, the liquid is transported to the post-stage solid-liquid separation assembly through the discharge port 10.

[0018] The application realizes the cooperative operation of gas supply, crushing and stirring through the combination design of the gas supply assembly 15, the crushing mechanism 14 and the circulating stirring mechanism, and solves the problems of large bubbles and small contact area of the general reaction tank.

[0019] Example 2: Please refer to Figure 2 On the basis of example 1, the circulating stirring mechanism comprises a screw flight 12 fixedly installed on the periphery of the hollow shaft one 7, and the outer edge of the screw flight 12 is in sliding contact with the inner wall of the cylindrical isolation cover 11. And a plurality of stirring blades 13 fixedly installed on the periphery of the hollow shaft one 7, and the plurality of stirring blades 13 are arrayed along the helical trajectory of the screw flight 12 on the periphery of the hollow shaft one 7.

[0020] The circulating stirring mechanism drives the screw flight 12 and the stirring blade 13 to operate through the hollow shaft one 7; the outer edge of the screw flight 12 is in sliding contact with the inner wall of the cylindrical isolation cover 11, and when rotating, the screw flight 12 guides the raw material liquid in the cylindrical isolation cover 11 upwards, so that the raw material liquid forms a circulating flow between the carbon reaction tank 1 and the cylindrical isolation cover 11 inside the cylindrical isolation cover 11; at the same time, the stirring blade 13 is arrayed along the helical trajectory of the screw flight 12, and rotates with the hollow shaft one 7 to realize circumferential stirring, and forms a cooperative flow field with the axial guidance of the screw flight 12. After the carbon dioxide bubbles are sprayed out through the gas supply assembly 15, they spiral upwards along the circulating flow field, avoiding direct floating, thereby prolonging the residence time, and at the same time, fully mixing and reacting with the raw material liquid after being broken by the crushing mechanism 14.

[0021] In this embodiment, through the cooperation of the structure of the auger blade 12 and the stirring blade 13, a composite flow field of axial circulation and circumferential stirring is realized, the problems of poor liquid circulation and short bubble residence time of the general reaction tank are solved, the uniformity of gas-liquid mixing is improved, and the local uneven reaction is effectively avoided.

[0022] Embodiment 3: please refer to Figure 2 and Figures 4-6 On the basis of embodiment 1, the crushing mechanism 14 includes a driving gear 25 and a plurality of crushing assemblies 27, the driving gear 25 is fixedly installed on the outer periphery of the hollow shaft one 7 at a position close to the bottom end; The plurality of crushing assemblies 27 are fixedly installed on the inner wall of the cylindrical isolation cover 11, the plurality of crushing assemblies 27 are distributed in a circumferential array about the axis of the cylindrical isolation cover 11, and the plurality of crushing assemblies 27 are in transmission connection between the driving gear 25; The side surface of the driving gear 25 is hollow.

[0023] The crushing assembly 27 includes a boss 33 fixedly installed on the inner wall of the cylindrical isolation cover 11, a bearing seat 34 fixedly installed at the front end of the boss 33, a transmission shaft 36 rotatably installed in the bearing seat 34 in a penetrating manner, a driven gear 32 engaged with the driving gear 25 fixedly installed at the bottom end of the transmission shaft 36, and a crushing impeller 35 fixedly installed at the bottom end of the transmission shaft 36.

[0024] On the basis of embodiment 2, the crushing mechanism 14 realizes reinforced crushing through the meshing transmission of the driving gear 25 and the plurality of crushing assemblies 27; the hollow shaft one 7 drives the driving gear 25 to rotate, the driving gear 25 drives the driven gears 32 of the plurality of crushing assemblies 27 to rotate through engagement, and in turn drives the transmission shaft 36 and the crushing impeller 35 to operate at high speed; The side surface of the driving gear 25 is designed to be hollow, which does not affect the floating path of the bubbles; after the bubbles are sprayed out by the gas supply assembly 15, they directly enter the action area of the plurality of crushing impellers 35 and are further crushed into micron-sized bubbles by the high-speed rotating crushing impellers 35; at the same time, the plurality of crushing assemblies 27 are distributed in a circumferential array about the axis of the cylindrical isolation cover 11, realizing omnibearing and dead-angle-free crushing of the bubbles.

[0025] Embodiment 4: please refer to Figure 2 , Figure 4 and Figure 5 On the basis of embodiment 3, the gas supply assembly 15 includes a flow dividing disc 31 fixedly installed at the bottom end of the hollow shaft two 8 in a penetrating manner, the flow dividing disc 31 is of a hollow structure, a coaxial annular gas guide pipe 28 is sleeved on the outer periphery of the flow dividing disc 31, a plurality of uniformly distributed gas outlet holes 29 are formed on the outer periphery of the annular gas guide pipe 28, and the diameter of the annular gas guide pipe 28 is equal to the distance from the axis of the bearing seat 34 to the axis of the cylindrical isolation cover 11. A plurality of pipes 30 are fixedly connected between the periphery of the distribution disc 31 and the annular air guide pipe 28 in a through manner.

[0026] On the basis of Embodiment 3, the gas supply assembly 15 forms a precise gas supply channel through the hollow shaft two 8, the distribution disc 31, the pipes 30 and the annular air guide pipe 28; the carbon dioxide enters the distribution disc 31 through the hollow shaft two 8, is evenly distributed to the annular air guide pipe 28 through the plurality of axially arrayed pipes 30, and is sprayed into the raw material liquid through the plurality of gas outlet holes 29 on the periphery of the annular air guide pipe 28; The diameter of the annular air guide pipe 28 is equal to the distance from the axis of the bearing seat 34 to the axis of the cylindrical isolation cover 11, so as to ensure that the sprayed bubbles are directly aligned with the action area of the crushing assembly 27; at the same time, the hollow shaft two 8 drives the annular air guide pipe 28 to rotate, so as to realize dynamic gas supply, avoid the bubbles from being concentratedly distributed, and further improve the crushing uniformity.

[0027] Therefore, in the embodiment, the problem of uneven gas supply and scattered bubble distribution of the general reaction tank is solved through the dynamic precise gas supply structure; the rotating gas supply of the annular air guide pipe 28 is precisely docked with the plurality of crushing assemblies 27, the bubble crushing rate is improved, and the gas-liquid mixing uniformity is further improved.

[0028] Embodiment 5: please refer to Figures 1-3 On the basis of Embodiment 1, the driving assembly 5 includes a mounting frame 16, a driven pulley one 20 and a driven pulley two 24, the driven pulley one 20 is fixedly installed at the top end position on the periphery of the hollow shaft one 7, and the driven pulley two 24 is fixedly installed at the top end position on the periphery of the hollow shaft two 8. The mounting frame 16 is fixedly installed with a motor one 17 and a motor two 21, the output shaft of the motor one 17 is fixedly installed with a driving pulley one 18, and the driving pulley one 18 and the driven pulley one 20 are installed with a belt one 19. The output shaft of the motor two 21 is fixedly installed with a driving pulley two 22, and the driving pulley two 22 and the driven pulley two 24 are installed with a belt two 23.

[0029] The driving assembly 5 realizes the independent driving of the hollow shaft one 7 and the hollow shaft two 8 through the motor one 17 and the motor two 21 respectively; the motor one 17 drives the driven pulley one 20 to rotate through the driving pulley one 18 and the belt one 19, thereby driving the hollow shaft one 7 to operate and controlling the rotating speed of the circulating stirring mechanism and the crushing mechanism 14; the motor two 21 drives the driven pulley two 24 to rotate through the driving pulley two 22 and the belt two 23, thereby driving the hollow shaft two 8 to operate and controlling the rotating speed and the gas supply uniformity of the gas supply assembly 15; according to the reaction progress, the rotating speeds of the hollow shaft one 7 and the hollow shaft two 8 can be independently adjusted, so as to realize the precise matching of the stirring intensity, the crushing efficiency and the gas supply rate.

[0030] In the embodiment, the independent driving structure can flexibly adjust the stirring speed, the crushing efficiency and the gas supply rate according to the requirements of different stages of the reaction, for example, increasing the gas supply rate and the stirring intensity in the initial stage of the reaction, and reducing the speed to reduce the aggregation of the precipitates in the later stage of the reaction.

[0031] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A high-purity manganese carbonate preparation device, comprising a carbon reaction tank (1), a tank cover (2) is arranged at the top end of the carbon reaction tank (1), a discharge port (10) is arranged at the bottom end of the carbon reaction tank (1), a feeding port (3) and a pressure relief port (4) are arranged on the tank cover (2), a mounting seat (6) is fixedly installed on the top surface of the tank cover (2), characterized in that, Also includes: A drive assembly (5) is fixedly mounted on the mounting base (6); The hollow shaft 1 (7) that passes through the mounting base (6) is rotated and is connected to the drive assembly (5) in a transmission manner; A hollow shaft 2 (8) is rotated through the hollow shaft 1 (7). The hollow shaft 2 (8) is connected to the drive assembly (5) for transmission. The top end of the hollow shaft 2 (8) is connected to a rotatable air guide pipe (9) through a rotating tube connector. The air guide pipe (9) is connected to an external carbon dioxide supply device. A cylindrical isolation cover (11) is fixedly installed in the carbon reaction vessel (1). The cylindrical isolation cover (11) is coaxially arranged with the carbon reaction vessel (1). Multiple support columns (26) are fixedly connected between the bottom surface of the cylindrical isolation cover (11) and the inner bottom surface of the carbon reaction vessel (1). A circulating stirring mechanism is installed in a cylindrical isolation cover (11); An air supply assembly (15) is provided at the bottom of the cylindrical isolation cover (11). The air supply assembly (15) is connected to the bottom of the hollow shaft (8) and is used to supply carbon dioxide to the carbon reaction tank (1). And a crushing mechanism (14) disposed between the stirring mechanism and the gas supply assembly (15) for breaking up carbon dioxide bubbles to increase the gas-liquid contact area.

2. The device for preparing high-purity manganese carbonate according to claim 1, characterized by, The circulating stirring mechanism includes an auger blade (12) fixedly installed around the hollow shaft (7), and the outer edge of the auger blade (12) slides in contact with the inner wall of the cylindrical isolation cover (11); It also includes multiple stirring blades (13) fixedly installed on the periphery of the hollow shaft (7), and the multiple stirring blades (13) are distributed in an array along the spiral trajectory of the auger blade (12) on the periphery of the hollow shaft (7).

3. The device for preparing high-purity manganese carbonate according to claim 1, characterized by, The crushing mechanism (14) includes a drive gear (25) and multiple crushing components (27). The drive gear (25) is fixedly installed on the periphery of the hollow shaft (7) near the bottom end. Multiple sets of the crushing components (27) are fixedly installed on the inner wall of the cylindrical isolation cover (11). The multiple sets of crushing components (27) are arranged in a circumferential array about the axis of the cylindrical isolation cover (11), and the multiple sets of crushing components (27) are all connected to the drive gear (25) through transmission. The side of the drive gear (25) is hollowed out.

4. The device for preparing high-purity manganese carbonate according to claim 3, characterized by The crushing assembly (27) includes a boss (33) fixedly installed on the inner wall of a cylindrical isolation cover (11). A bearing seat (34) is fixedly installed at the front end of the boss (33). A drive shaft (36) is rotatably installed through the bearing seat (34). A driven gear (32) meshing with the drive gear (25) is fixedly installed at the bottom end of the drive shaft (36). A crushing impeller (35) is fixedly installed at the bottom end of the drive shaft (36).

5. The apparatus of claim 4, wherein the apparatus is configured to produce high purity manganese carbonate. The air supply assembly (15) comprises a shunt disc (31) fixedly installed through the bottom end of the hollow shaft two (8), the shunt disc (31) is a hollow structure, the shunt disc (31) is provided with a coaxial annular air guide pipe (28) on the periphery, a plurality of uniformly distributed air outlet holes (29) are formed on the periphery of the annular air guide pipe (28), the diameter of the annular air guide pipe (28) is equal to the distance from the axis of the bearing seat (34) to the axis of the cylindrical isolation cover (11); A plurality of catheters (30) are fixedly connected in an axial array between the periphery of the shunt disc (31) and the annular air guide pipe (28).

6. The device for preparing high-purity manganese carbonate according to claim 1, wherein The driving assembly (5) comprises a mounting frame (16), a driven pulley one (20) and a driven pulley two (24), the driven pulley one (20) is fixedly installed at the top end position of the periphery of the hollow shaft one (7), and the driven pulley two (24) is fixedly installed at the top end position of the periphery of the hollow shaft two (8); The mounting frame (16) is fixedly provided with a motor one (17) and a motor two (21), the output shaft of the motor one (17) is fixedly provided with a driving pulley one (18), and the driving pulley one (18) and the driven pulley one (20) are provided with a belt one (19); The output shaft of the motor two (21) is fixedly provided with a driving pulley two (22), and the driving pulley two (22) and the driven pulley two (24) are provided with a belt two (23).

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