Electrodeposition cobalt activated carbon oil removal device

Abstract

The present application relates to the technical field of activated carbon oil removal, and particularly relates to a device for removing oil from activated carbon for electrowinning cobalt, which comprises a main cylinder with an elliptical cylinder structure, the upper end of the main cylinder is provided with a circulating oil removal mechanism which is capable of easily removing concentrated organic substances in the main cylinder by activated carbon circulation, the circulating oil removal mechanism comprises a first placement groove formed in the upper end surface of the main cylinder, the main cylinder is fixedly connected with a first fixed plate in the first placement groove through bolts, the first fixed plate is a circular ring structure, the inner side surface of the first fixed plate is provided with a second fixed plate through a threaded structure, the lower end of the main cylinder is provided with a centrifugal air flotation mechanism which is capable of separating the concentration of the solution in the main cylinder and air float impurity removal, a first motor drives a connecting plate to rotate, so that a third through hole in the side surface of a first fixed rod coincides with a second through hole in the side surface of a fixed ring, then a gas pump is started, so that the high-concentration organic solution in the main cylinder is driven into a conveying pipe, and the efficiency of activated carbon treatment is improved.

Description

Technical Field

[0001] This invention relates to the field of activated carbon degreasing technology, and more particularly to an electrolytic cobalt activated carbon degreasing device. Background Technology

[0002] In the hydrometallurgical production of electrolytic cobalt, the electrolyte (usually a chloride or sulfate solution rich in Co²⁺) must maintain extremely high purity before entering the electrolytic deposition process. Oily organic matter is one particularly harmful impurity. Oil adheres to the cathode plate surface, causing pores, nodules, surface blackening, and rough crystals on the cobalt plate. In severe cases, it can even cause large-area peeling. Furthermore, the oil film increases the resistance of the cathode surface, hindering the discharge deposition of Co²⁺ and increasing energy consumption. Therefore, before hydrometallurgical cobalt production, an activated carbon oil removal process is required to remove organic matter from the solution without generating further impurities.

[0003] In existing technologies, the removal of organic matter from solutions is generally achieved through activated carbon adsorption, which involves placing several pieces of activated carbon directly into a reaction vessel. However, this method results in a very slow contact rate between the activated carbon surface and the solution, leading to low processing efficiency. Furthermore, suspended impurities are prone to appear in the solution and are easily adsorbed onto the activated carbon surface, reducing the contact area between the activated carbon and the solution and thus lowering the adsorption performance of the activated carbon. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing an electrolytic cobalt activated carbon degreasing device.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an electrolytic cobalt activated carbon degreasing device, comprising a main body cylinder with an elliptical cylindrical structure, wherein the upper end of the main body cylinder is provided with a circulating degreasing mechanism for easy activated carbon circulation removal of concentrated organic matter inside the main body cylinder, the circulating degreasing mechanism including a first placement groove opened on the upper end face of the main body cylinder, a first fixing plate fixedly connected to the main body cylinder in the first placement groove by bolts, the first fixing plate having a circular ring structure, a second fixing plate being provided on the inner side of the first fixing plate by a threaded structure, a first through hole being opened through the end face of the second fixing plate, a first fixing rod being connected to the second fixing plate in the first through hole, a first empty groove being opened at the upper end of the first fixing rod, a fixing ring being rotatably connected to the first fixing rod in the first empty groove, a centrifugal flotation mechanism for concentration separation and air flotation impurity removal of the solution inside the main body cylinder being provided at the lower end of the main body cylinder, and four symmetrically arranged support columns being fixedly connected to the lower end of the main body cylinder.

[0006] Preferably, the upper end of the second fixing plate is fixedly connected to a conveying pipe that covers the first fixing rod, and the other end of the conveying pipe is connected to the side of the main body cylinder. The conveying pipe consists of two arc-shaped segments and one vertical segment, and the vertical segment of the conveying pipe is made of transparent material.

[0007] Preferably, the inner side of the conveying pipe is provided with a plurality of hourglass-shaped activated carbons arranged at equal intervals in the vertical section. Each of the several hourglass-shaped activated carbons is made of activated carbon material, the lower end of each of the several hourglass-shaped activated carbons is a guide groove structure, and the upper end of each of the several hourglass-shaped activated carbons is an arc surface structure.

[0008] Preferably, the first fixing rod has a second placement groove at the end of the first empty groove, the first fixing rod is fixedly connected to the second placement groove, the drive shaft end of the first motor is fixedly connected to the connecting plate, the side of the connecting plate is fixedly connected to the inner side of the fixing ring, and an air pump is provided inside the first fixing rod.

[0009] Preferably, the side of the fixing ring is provided with several sets of equidistant third through holes, each set of the third through holes being composed of four third through holes arranged in a circle, and the side of the first fixing rod is provided with several second through holes corresponding to the third through holes.

[0010] Preferably, the first fixing rod and the fixing ring are fixedly connected to a first one-way valve in a plurality of second through holes and third through holes, respectively.

[0011] Preferably, the centrifugal flotation mechanism includes a rotating groove at the lower end of the main body cylinder, a third fixing plate rotatably connected to the main body cylinder within the rotating groove, two symmetrically arranged fourth through holes penetrating the end of the third fixing plate, and stop plugs threadedly connected to the third fixing plate in each of the fourth through holes. A fourth placement groove is provided at the lower end of the main body cylinder, and a fourth fixing plate is connected to the fourth placement groove through a snap-fit ​​structure. The upper end of the fourth fixing plate is fixedly connected to the lower end of the stop plug.

[0012] Preferably, the lower end of the fourth fixing plate is provided with a fifth through hole, which is connected to an air pipe through a pipe; the lower end of the third fixing plate is provided with a sixth through hole that communicates with the fifth through hole; the upper end of the third fixing plate is provided with a plurality of first air outlet holes arranged at equal intervals, which are respectively connected to the sixth through hole; and the upper end of the third fixing plate is provided with a first receiving groove.

[0013] Preferably, the upper end of the third fixing plate is fixedly connected to two symmetrically arranged scraping bodies. The inner sides of the two scraping bodies are respectively provided with air supply chambers, and the two air supply chambers are respectively connected to the sixth through hole. The sides of the two scraping bodies are respectively provided with second receiving grooves. The outer sides of the two scraping bodies are attached to the inner side of the main body cylinder. The inner side of the scraping body is provided with several second air outlets that communicate with the air supply chambers. The scraping body is provided with several jet holes on the side that contacts the second receiving groove. The angle of the jet holes is downward. The second one-way valve is fixedly connected to the several second air outlets and jet holes respectively.

[0014] Preferably, the main body cylinder has a cavity on the side of the rotating groove, a third placement groove is formed in the cavity, a second motor is fixedly connected to the main body cylinder in the third placement groove, a gear is fixedly connected to the drive shaft end of the second motor, and a gear ring that meshes with the gear is fixedly connected to the side of the third fixing plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The third fixed plate drives the two scrapers to centrifugally rotate the solution inside the main cylinder. Simultaneously, external gas enters the sixth through-hole through the fifth through-hole. The gas in the sixth through-hole then exits through several first vent holes and second vent holes on the sides of the scrapers. The gas ejected from the second vent holes on the sides of the scrapers enters the solution after passing through the second one-way valve. Because the opening of the second one-way valve is extremely small, the gas enters the solution and transforms into several tiny bubbles. These tiny bubbles move towards the center under centrifugal force, ensuring stable contact between all parts of the solution and the bubbles. The bubbles then carry the oily organic matter towards the center. As the main body moves, some denser impurities move to the side of the main body cylinder. At this time, the first motor is started, which drives the connecting plate to rotate, so that the third through hole on the side of the first fixing rod coincides with the second through hole on the side of the fixing ring. Then, the air pump is started, which drives the high-concentration organic solution in the main body cylinder into the conveying pipe, thereby improving the efficiency of activated carbon treatment. The rotating main body cylinder can carry the denser deposits to the inner wall of the main body cylinder, and then scrape them off by the scraper. At the same time, the downward-angled jet hole can carry the impurities to the bottom of the main body cylinder, thereby preventing the denser deposits from adhering to the surface of the activated carbon and improving the efficiency of activated carbon degreasing.

[0017] 2. The upper end of the hourglass-shaped activated carbon has an arc-shaped structure, which can prevent organic matter from clogging a certain part of the end of the hourglass-shaped activated carbon. At the same time, the transparent conveying tube can easily observe the accumulation of impurities on the upper part of the hourglass-shaped activated carbon inside, preventing the conveying tube from being blocked. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a cross-sectional view of the entire invention. Figure 1 ;

[0020] Figure 3 This is a cross-sectional view of the entire invention. Figure 2 ;

[0021] Figure 4 This is a cross-sectional view of the entire invention. Figure 3 ;

[0022] Figure 5 For the present invention Figure 2 Enlarged view of point A;

[0023] Figure 6 For the present invention Figure 2 Enlarged view of point B;

[0024] Figure 7 For the present invention Figure 2 Enlarged view of point C;

[0025] Figure 8 For the present invention Figure 2 Enlarged view of point D;

[0026] Figure 9 For the present invention Figure 2 Enlarged view of point E;

[0027] Figure 10 For the present invention Figure 3 Enlarged view at point F;

[0028] Figure 11 For the present invention Figure 4 Enlarged view of point G.

[0029] 1. Main cylinder; 2. Circulating oil removal mechanism; 3. Centrifugal air flotation mechanism; 4. Support column; 21. Conveying pipe; 22. First placement tank; 23. First fixing plate; 24. Hourglass-shaped activated carbon; 25. Second fixing plate; 26. First through hole; 27. Air pump; 28. First fixing rod; 29. ​​Fixing ring; 210. Second through hole; 211. Third through hole; 212. Second placement tank; 213. Connecting plate; 214. First empty tank; 215. First motor; 31. Third 32. Fixed plate; 33. Cavity; 34. Gear; 35. Gear ring; 36. Third placement slot; 37. Second motor; 38. Fourth placement slot; 39. Fourth fixed plate; 30. Fourth through hole; 310. Stop plug; 311. Fifth through hole; 312. Sixth through hole; 314. First air outlet; 315. First receiving slot; 316. Scraper; 317. Second air outlet; 318. Air delivery chamber; 319. Second receiving slot; 320. Air jet hole; 321. Rotating slot. Detailed Implementation

[0030] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0031] Please see Figures 1-11 An electrolytic cobalt activated carbon degreasing device includes a main cylinder 1 with an elliptical cylindrical structure. The upper end of the main cylinder 1 is provided with a circulating degreasing mechanism 2 for easily removing concentrated organic matter in the main cylinder 1 by circulating activated carbon.

[0032] In this embodiment, the circulating oil removal mechanism 2 includes a first placement groove 22 opened on the upper end face of the main body cylinder 1. The main body cylinder 1 is fixedly connected to a first fixing plate 23 by bolts in the first placement groove 22. The first fixing plate 23 is a ring structure. A second fixing plate 25 is provided on the inner side of the first fixing plate 23 by a threaded structure. A first through hole 26 is opened through the end face of the second fixing plate 25. A first fixing rod 28 is connected to the second fixing plate 25 in the first through hole 26. A first empty groove 214 is opened at the upper end of the first fixing rod 28. A fixing ring 29 is rotatably connected to the first fixing rod 28 in the first empty groove 214.

[0033] The upper end of the second fixing plate 25 is fixedly connected to a conveying pipe 21 that covers the first fixing rod 28. The other end of the conveying pipe 21 is connected to the side of the main body cylinder 1. The conveying pipe 21 consists of two arc-shaped sections and one vertical section. The vertical section of the conveying pipe 21 is made of transparent material.

[0034] The inner side of the conveying pipe 21 is provided with a number of hourglass-shaped activated carbons 24 arranged at equal intervals in the vertical section. Each of the hourglass-shaped activated carbons 24 is made of activated carbon material. The lower end of each hourglass-shaped activated carbon 24 is a guide groove structure, and the upper end of each hourglass-shaped activated carbon 24 is an arc surface structure.

[0035] The first fixing rod 28 has a second placement groove 212 at the end of the first empty groove 214. The first fixing rod 28 is fixedly connected to the second placement groove 212. The drive shaft end of the first motor 215 is fixedly connected to the connecting plate 213. The side of the connecting plate 213 is fixedly connected to the inner side of the fixing ring 29. An air pump 27 is provided inside the first fixing rod 28.

[0036] The side of the fixing ring 29 is provided with several sets of equidistant third through holes 211, each set of the third through holes 211 is composed of four third through holes 211 arranged in a circle, and the side of the first fixing rod 28 is provided with several second through holes 210 corresponding to the third through holes 211.

[0037] The first fixing rod 28 and the fixing ring 29 are respectively fixedly connected to the first one-way valve in a number of second through holes 210 and third through holes 211.

[0038] Specifically, the first motor 215 is started, which drives the connecting plate 213 to rotate, so that the third through hole 211 on the side of the first fixing rod 28 coincides with the second through hole 210 on the side of the fixing ring 29. Then the air pump 27 is started, thereby driving the high-concentration organic solution in the main body cylinder 1 into the conveying pipe 21, improving the efficiency of activated carbon treatment. The rotating main body cylinder 1 can drive the denser deposits to the inner wall of the main body cylinder 1, and then scrape them off by the scraper 316.

[0039] In this embodiment, the lower end of the main body cylinder 1 is provided with a centrifugal flotation mechanism 3 for concentration separation and air flotation impurity removal of the solution in the main body cylinder 1, and four symmetrically arranged support columns 4 are fixedly connected to the lower end of the main body cylinder 1.

[0040] The centrifugal flotation mechanism 3 includes a rotating groove 321 at the lower end of the main body cylinder 1. A third fixing plate 31 is rotatably connected to the main body cylinder 1 within the rotating groove 321. Two symmetrically arranged fourth through holes 39 are opened through the end of the third fixing plate 31. A stop plug 310 is threadedly connected to the third fixing plate 31 within each of the fourth through holes 39. A fourth placement groove 37 is opened at the lower end of the main body cylinder 1. A fourth fixing plate 38 is connected to the fourth placement groove 37 through a snap-fit ​​structure. The upper end of the fourth fixing plate 38 is fixedly connected to the lower end of the stop plug 310.

[0041] The lower end of the fourth fixing plate 38 is provided with a fifth through hole 311, which is connected to an air pipe through a pipe. The lower end of the third fixing plate 31 is provided with a sixth through hole 312 that communicates with the fifth through hole 311. The upper end of the third fixing plate 31 is provided with a plurality of first air outlet holes 314 arranged at equal intervals, which communicate with the sixth through hole 312 respectively. The upper end of the third fixing plate 31 is provided with a first receiving groove 315.

[0042] Two symmetrically arranged scraper bodies 316 are fixedly connected to the upper end of the third fixing plate 31. The inner side of each scraper body 316 is provided with an air supply chamber 318, which is connected to the sixth through hole 312. The side of each scraper body 316 is provided with a second receiving groove 319. The outer side of each scraper body 316 is in contact with the inner side of the main body cylinder 1. The inner side of each scraper body 316 is provided with several second air outlets 317 that are connected to the air supply chambers 318. Several jet holes 320 are provided on the side of each scraper body 316 that is in contact with the second receiving groove 319. The angle of the jet holes 320 is downward. A second one-way valve is fixedly connected to each of the second air outlets 317 and the jet holes 320.

[0043] The main body cylinder 1 has a cavity 32 on the side of the rotating groove 321. The main body cylinder 1 has a third placement groove 35 in the cavity 32. The main body cylinder 1 is fixedly connected to the third placement groove 35. The transmission shaft end of the second motor 36 is fixedly connected to a gear 33. The side of the third fixing plate 31 is fixedly connected to a toothed ring 34 that meshes with the gear 33.

[0044] Specifically, the second motor 36 drives the gear 33 to rotate, the gear 33 in turn drives the gear ring 34 to rotate, the gear ring 34 drives the third fixed plate 31 to rotate, and at the same time, the third fixed plate 31 drives the two scraping bodies 316 to centrifuge the solution in the main body cylinder 1. While rotating, the external gas enters the sixth through hole 312 through the fifth through hole 311. Then, the gas in the sixth through hole 312 is discharged through several first vent holes 314 and the second vent holes 317 on the side of the scraping body 316. The gas ejected from the second vent holes 317 on the side of the scraping body 316 enters the solution after passing through the second one-way valve.

[0045] In use, the solution is poured into the main body cylinder 1, and then the first motor 215 is started. The first motor 215 drives the fixed ring 29 to rotate through the connecting plate 213, so that the second through hole 210 and the third through hole 211 do not coincide. At the same time, the second motor 36 is started, and the second motor 36 drives the gear 33 to rotate. The gear 33 drives the gear ring 34 to rotate, and the gear ring 34 drives the third fixed plate 31 to rotate. At the same time, the third fixed plate 31 drives the two scrapers 316 to centrifuge the solution in the main body cylinder 1. During the rotation, external gas enters the sixth through hole 312 through the fifth through hole 311. Then, the gas in the sixth through hole 312 is discharged through several first vent holes 314 and the second vent holes 317 on the side of the scraper 316. The gas ejected from the second vent holes 317 on the side of the scraper 316 enters the solution after passing through the second one-way valve. Since the opening of the second one-way valve is extremely small, the gas entering the solution is divided into several tiny... Bubbles, several tiny bubbles, move towards the center under centrifugal force, ensuring stable contact between the solution and the bubbles at all points. The bubbles then carry oily organic matter towards the center, while denser impurities move towards the side of the main cylinder 1. At this point, the first motor 215 is activated, driving the connecting plate 213 to rotate, causing the third through hole 211 on the side of the first fixing rod 28 to coincide with the second through hole 210 on the side of the fixing ring 29. Then, the air pump 27 is activated, carrying the high-concentration organic solution from the main cylinder 1 into the delivery pipe 21, improving the efficiency of activated carbon treatment. The rotating main cylinder 1 carries denser deposits to its inner wall, where they are scraped off by the scraper 316. Simultaneously, the downward-angled jet nozzle 320 carries impurities to the bottom of the main cylinder 1, preventing denser deposits from adhering to the activated carbon surface and improving the oil removal efficiency of the activated carbon.

[0046] After the high-concentration organic solution enters the vertical section of the delivery pipe 21, it undergoes activated carbon adsorption through several hourglass-shaped activated carbons 24. The upper end of the hourglass-shaped activated carbons 24 has an arc-shaped structure, which can prevent organic matter from clogging a certain part of the end of the hourglass-shaped activated carbons 24. At the same time, the transparent structure of the delivery pipe 21 allows for easy observation of the accumulation of impurities above the hourglass-shaped activated carbons 24 inside, preventing the delivery pipe 21 from becoming clogged.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An electrolytic cobalt activated carbon degreasing device, comprising a main body cylinder (1) with an elliptical cylindrical structure, characterized in that: The upper end of the main body cylinder (1) is provided with a circulating oil removal mechanism (2) for easy removal of concentrated organic matter in the main body cylinder (1) by activated carbon circulation. The circulating oil removal mechanism (2) includes a first placement groove (22) opened on the upper end face of the main body cylinder (1). The main body cylinder (1) is fixedly connected to a first fixing plate (23) by bolts in the first placement groove (22). The first fixing plate (23) is a ring structure. The inner side of the first fixing plate (23) is provided with a second fixing plate (25) by a threaded structure. The end of the second fixing plate (25) A first through hole (26) is provided through the surface. A first fixing rod (28) is connected to the second fixing plate (25) in the first through hole (26). A first slot (214) is provided at the upper end of the first fixing rod (28). A fixing ring (29) is rotatably connected to the first fixing rod (28) in the first slot (214). A centrifugal flotation mechanism (3) for concentration separation and air flotation impurity removal of the solution in the main body (1) is provided at the lower end of the main body (1). Four symmetrically arranged support columns (4) are fixedly connected to the lower end of the main body (1).

2. The cobalt-cobalt activated carbon degreasing device according to claim 1, characterized in that: The upper end of the second fixing plate (25) is fixedly connected to a conveying pipe (21) covering the first fixing rod (28). The other end of the conveying pipe (21) is connected to the side of the main body cylinder (1). The conveying pipe (21) consists of two arc-shaped sections and a vertical section. The vertical section of the conveying pipe (21) is made of transparent material.

3. The cobalt-cobalt activated carbon degreasing device according to claim 2, characterized in that: The inner side of the conveying pipe (21) is provided with several hourglass-shaped activated carbons (24) arranged at equal intervals in the vertical section. Each of the several hourglass-shaped activated carbons (24) is made of activated carbon material. The lower end of each of the several hourglass-shaped activated carbons (24) is a guide groove structure, and the upper end of each of the several hourglass-shaped activated carbons (24) is an arc surface structure.

4. The cobalt-cobalt activated carbon degreasing device according to claim 1, characterized in that: The first fixing rod (28) has a second placement groove (212) at the end of the first empty groove (214). The first fixing rod (28) is fixedly connected to the second placement groove (212) with a first motor (215). The drive shaft end of the first motor (215) is fixedly connected to a connecting plate (213). The side of the connecting plate (213) is fixedly connected to the inner side of the fixing ring (29). An air pump (27) is provided in the first fixing rod (28).

5. The cobalt-cobalt activated carbon degreasing device according to claim 4, characterized in that: The side of the fixing ring (29) is provided with several sets of equidistant third through holes (211), each set of the third through holes (211) is composed of four third through holes (211) arranged in a circle, and the side of the first fixing rod (28) is provided with several second through holes (210) corresponding to the third through holes (211).

6. The cobalt-cobalt activated carbon degreasing device according to claim 5, characterized in that: The first fixing rod (28) and the fixing ring (29) are respectively fixedly connected to the first one-way valve in a number of second through holes (210) and third through holes (211).

7. The cobalt-cobalt activated carbon degreasing device according to claim 1, characterized in that: The centrifugal flotation mechanism (3) includes a rotating groove (321) at the lower end of the main body cylinder (1). The main body cylinder (1) is rotatably connected to a third fixing plate (31) in the rotating groove (321). The end of the third fixing plate (31) has two symmetrically arranged fourth through holes (39). The third fixing plate (31) is connected to a stop plug (310) in the fourth through holes (39) by thread. The lower end of the main body cylinder (1) has a fourth placement groove (37). The fourth fixing plate (38) is connected to the fourth placement groove (37) by a snap-fit ​​structure. The upper end of the fourth fixing plate (38) is fixedly connected to the lower end of the stop plug (310).

8. The cobalt-cobalt activated carbon degreasing device according to claim 7, characterized in that: The lower end of the fourth fixing plate (38) is provided with a fifth through hole (311), which is connected to the air pipe through a pipe. The lower end of the third fixing plate (31) is provided with a sixth through hole (312) that communicates with the fifth through hole (311). The upper end of the third fixing plate (31) is provided with a plurality of first air outlet holes (314) arranged at equal intervals, which communicate with the sixth through hole (312) respectively. The upper end of the third fixing plate (31) is provided with a first receiving groove (315).

9. The cobalt-cobalt activated carbon degreasing device according to claim 7, characterized in that: The upper end of the third fixed plate (31) is fixedly connected to two symmetrically arranged scraper bodies (316). The inner sides of the two scraper bodies (316) are respectively provided with air supply chambers (318). The two air supply chambers (318) are respectively connected to the sixth through hole (312). The sides of the two scraper bodies (316) are respectively provided with second receiving grooves (319). The outer sides of the two scraper bodies (316) are in contact with the inner side of the main body cylinder (1). The inner side of the scraper body (316) is provided with several second air outlets (317) that communicate with the air supply chambers (318). The scraper body (316) is provided with several jet holes (320) on the side that contacts the second receiving groove (319). The angle of the several jet holes (320) is downward. The several second air outlets (317) and jet holes (320) are respectively fixedly connected with second one-way valves.

10. The cobalt-cobalt activated carbon degreasing device according to claim 7, characterized in that: The main body cylinder (1) has a cavity (32) on the side of the rotating groove (321). The main body cylinder (1) has a third placement groove (35) in the cavity (32). The main body cylinder (1) has a second motor (36) fixedly connected in the third placement groove (35). The transmission shaft end of the second motor (36) is fixedly connected to a gear (33). The side of the third fixing plate (31) is fixedly connected to a gear ring (34) that meshes with the gear (33).

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