阅读说明：本技术 一种新型绿色聚酯催化剂及其制备方法 (Novel green polyester catalyst and preparation method thereof ) 是由 郁如松 朱云飞 郁国夫 沈新晔 姚龙飞 于 2021-08-18 设计创作，主要内容包括：本申请公开了一种新型绿色聚酯催化剂,由钛化合物、多元醇、磷化合物以及金属化合物经合成反应得到,钛化合物为钛酸四丁酯或钛酸四甲酯,多元醇为乙二醇,金属化合物为氢氧化锂、氢氧化钠或碳酸钾,所述的磷化合物为亚磷酸三甲酯、亚磷酸三乙酯、亚磷酸三苯酯或者是磷酸、磷酸三异丙脂、磷酸三甲苯酯、三苯基氧化瞵,其特征在于：钛化合物与多元醇的摩尔比为一比一点五；钛化合物中钛原子与磷化合物中磷原子的质量比为一比五；磷化合物中磷原子与金属化合物中金属原子的摩尔比为一比一点五。其长期保存稳定性,催化活性高,方便长时间的保存。(The application discloses a novel green polyester catalyst, which is obtained by carrying out synthesis reaction on a titanium compound, a polyol, a phosphorus compound and a metal compound, wherein the titanium compound is tetrabutyl titanate or tetramethyl titanate, the polyol is ethylene glycol, the metal compound is lithium hydroxide, sodium hydroxide or potassium carbonate, the phosphorus compound is trimethyl phosphite, triethyl phosphite or triphenyl phosphite or phosphoric acid, triisopropyl phosphate, tricresyl phosphate or triphenylphosphine oxide, and the catalyst is characterized in that: the molar ratio of the titanium compound to the polyol is one to one and a little five; the mass ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is one to five; the molar ratio of phosphorus atoms in the phosphorus compound to metal atoms in the metal compound is one to one and a little five. It has long storage stability, high catalytic activity and long storage life.)

1. A novel green polyester catalyst is obtained by carrying out synthesis reaction on a titanium compound, a polyhydric alcohol, a phosphorus compound and a metal compound, wherein the titanium compound is tetrabutyl titanate or tetramethyl titanate, the polyhydric alcohol is ethylene glycol, the metal compound is lithium hydroxide, sodium hydroxide or potassium carbonate, the phosphorus compound is trimethyl phosphite, triethyl phosphite or triphenyl phosphite or phosphoric acid, triisopropyl phosphate, tricresyl phosphate or triphenylphosphine oxide, and the catalyst is characterized in that: the molar ratio of the titanium compound to the polyol is one to one and a little five; the mass ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is one to five; the molar ratio of phosphorus atoms in the phosphorus compound to metal atoms in the metal compound is one to one and a little five.

2. A method for preparing a novel green polyester catalyst suitable for the process of claim 1, wherein the alcohol, the phosphorus compound and the metal compound are mixed in a solvent in advance, the reaction time is 1-2 hr, and the reaction temperature is 50-60 ℃; then adding the liquid mixture into a reaction box, uniformly adding a titanium compound into the liquid mixture, stirring and mixing to obtain the catalyst for preparing the polyester.

3. A reaction box suitable for the preparation method of the novel green polyester catalyst according to claim 2, which comprises a box body (1) with an open top, wherein a top cover (2) is hinged on the top of the box body (1), a feed hopper (3) is arranged on the top cover (2), a rotating shaft (4) is arranged in the box body (1), the lower end of the rotating shaft (4) penetrates through the bottom of the box body (1) in a rotating manner, a plurality of supporting legs (5) are arranged at the outer bottom of the box body (1), a motor (7) is arranged at the bottom of the box body (1), a protective cover (8) is fixed outside the motor (7) and positioned at the bottom of the box body (1), the output end of the motor (7) is connected with a driving shaft (10), a driving fluted disc (11) is connected after the lower end of the driving shaft (10) penetrates through the protective cover (8), a matching fluted disc (12) is arranged at the lower end of the rotating shaft (4), the driving shaft (10) is in transmission connection with the rotating shaft (4) in a matched mode through a driving fluted disc (11) and a matching fluted disc (12), and a plurality of pulping blades (13) are arranged on the side wall of the rotating shaft (4) at intervals along the height direction.

4. The reaction box for preparing the novel green polyester catalyst according to claim 3, wherein a cross bar (6) is arranged between a plurality of supporting legs (5), and the lower end of the rotating shaft (4) is rotated to penetrate through the cross bar (6).

5. The reaction box of the preparation method of the novel green polyester catalyst according to claim 3, characterized in that the handle (19) is arranged on the upper surface of the top cover (2) far away from the hinged joint with the box body (1).

6. The reaction box for preparing the novel green polyester catalyst as claimed in claim 3, wherein a layer of soundproof cotton (9) is arranged on the inner wall of the protective cover (8).

7. The reaction box of the preparation method of the novel green polyester catalyst, according to claim 3, 4, 5 or 6, further comprising a discharge pipe (20) connected to the bottom of the box body (1), wherein a filtering discharge assembly is connected to the discharge pipe (20), the filtering discharge assembly comprises a discharge control valve (21) arranged on the discharge pipe (20) and a filtering box (22) connected to the lower end of the discharge pipe (20), a filtering net (23) is arranged inside the filtering box (22), a discharging pipe (24) is connected to the bottom of the filtering box (22), and a discharging valve (25) is arranged on the discharging pipe (24).

8. The reaction box of the preparation method of the novel green polyester catalyst according to claim 7, wherein a backwashing assembly for backwashing the filter screen (23) is connected to the blanking pipe (24), the backwashing assembly comprises an inlet pipe (31) connected to the blanking pipe (24) and located above the blanking valve (25), a water pump (32) and an inlet valve (33) are arranged on the inlet pipe (31), an outlet pipe (34) is connected to the outlet pipe (20) and located below the discharge control valve (21), and an outlet valve (35) is arranged on the outlet pipe (34).

9. The reaction box of the novel green polyester catalyst preparation method according to claim 8, wherein an adding component for uniformly adding a titanium compound into a liquid mixture for stirring and mixing is arranged at the center of the lower surface of the top cover (2), the adding component comprises a hollow cylinder (41) and a conduit (51), a pump body (52) is connected in series with the conduit (51), the leading end of the conduit (51) penetrates through the top of the top cover (2) and then is connected with the cylinder (41), the bottom of the cylinder (41) is rotatably connected with a rotating column (411), the lower end of the rotating column (411) is connected with a middle column (412) with a cavity, the middle column (412) is connected with at least two auxiliary pipes (42), the side wall of one end of the auxiliary pipe (42) far away from the middle column (412) is provided with a rotating spray hole (43), and the middle column (412) and the at least two auxiliary pipes (42) are driven to wind around the middle column (412) when the rotating spray hole (43) is sprayed The central shaft of the column (412) rotates, and a plurality of spray holes (44) are sequentially arranged on the lower surface of the auxiliary pipe (42) at equal intervals along the length direction.

10. The reaction box of the novel green polyester catalyst preparation method according to claim 9, wherein the secondary pipe (42) comprises a first secondary pipe (421) and a second secondary pipe (422) which are connected with each other, the first secondary pipe (421) extends along a circumferential radial line with the middle column (412) as a center, one end of the first secondary pipe (421) is fixedly connected with the middle column (412), and the second secondary pipe (422) extends obliquely outwards in a clockwise or counterclockwise direction of the circumference of the middle column (412).

Technical Field

The invention relates to the technical field of polyester catalysts, in particular to a novel green polyester catalyst and a preparation method thereof.

Background

At present, the main catalysts for industrial production application and research are three series of compounds of Sb, Ge and Ti. The current production using antimony catalysts is about 90%. Although the antimony-based catalyst is excellent in catalytic effect, when an antimony compound is used as a polymerization catalyst, the polyester obtained has defects when melt-spinning is continuously carried out for a long period of time, foreign materials adhere and accumulate at the mouth of the melt-spinning tube and cause the polymer melt extruded through the mouth of the tube to be bent, and the bending phenomenon causes the formation of fluff and the breakage of melt-spun filaments during the melt-spinning and drawing processes, polluting the environment; while the germanium catalyst has good performance and the color tone of the obtained PET is good, the cost is too high to realize the production. In the face of this problem, studies on the use of titanium compounds as polymerization catalysts have been actively conducted. The titanium compound has a higher catalytic activity than the antimony compound, and the production of foreign particles can be suppressed because the desired catalytic activity can be obtained by adding a small amount of the titanium compound. However, the existing titanium polyester catalyst has poor stability in long-term storage and low catalytic activity, and in the preparation process, the raw materials of main titanium cannot be uniformly added into the solution well, so that the overall quality uniformity is poor, impurities exist after mixing and need to be additionally filtered, equipment for mixing is inconvenient to maintain, more time is wasted, noise is high, the working environment is affected, and discomfort of workers can be caused.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art.

The application provides a novel green polyester catalyst, which is obtained by carrying out synthesis reaction on a titanium compound, a polyol, a phosphorus compound and a metal compound, wherein the titanium compound is tetrabutyl titanate or tetramethyl titanate, the polyol is ethylene glycol, the metal compound is lithium hydroxide, sodium hydroxide or potassium carbonate, the phosphorus compound is trimethyl phosphite, triethyl phosphite or triphenyl phosphite or phosphoric acid, triisopropyl phosphate, tricresyl phosphate or triphenylphosphine oxide, and the catalyst is characterized in that: the molar ratio of the titanium compound to the polyol is one to one and a little five; the mass ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is one to five; the molar ratio of phosphorus atoms in the phosphorus compound to metal atoms in the metal compound is one to one and a little five.

The novel green polyester catalyst has high long-term storage stability and high catalytic activity, and the molar ratio of the titanium compound to the polyhydric alcohol is one to a little five by setting a proper proportion; the mass ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is one to five; the molar ratio of the phosphorus atoms in the phosphorus compound to the metal atoms in the metal compound is one to one and a little five, so that the stability of the catalyst can be greatly improved under the proportion, and the catalyst is convenient to store for a long time.

The invention also discloses a preparation method of the novel green polyester catalyst, which is characterized in that alcohol, phosphorus compound and metal compound are mixed in a solvent in advance, the reaction time is 1-2 hr, and the reaction temperature is 50-60 ℃; then adding the liquid mixture into a reaction box, uniformly adding a titanium compound into the liquid mixture, stirring and mixing to obtain the catalyst for preparing the polyester.

The invention also discloses a reaction box for the preparation method of the novel green polyester catalyst, which is characterized by comprising a box body with an opening at the top, wherein the top of the box body is hinged with a top cover, the top cover is provided with a feed hopper, the box body is internally provided with a rotating shaft, the lower end of the rotating shaft rotatably penetrates through the bottom of the box body, the bottom outside the box body is provided with a plurality of supporting legs, the bottom of the box body is provided with a motor, a protective cover is fixed outside the motor and positioned at the bottom of the box body, the output end of the motor is connected with a driving shaft, the lower end of the driving shaft penetrates through the protective cover and is connected with a driving fluted disc, the lower end of the rotating shaft is provided with a matching fluted disc, the driving shaft and the rotating shaft are in matching transmission connection through the driving fluted disc and the matching fluted disc, and a plurality of pulping blades are arranged on the side wall of the rotating shaft at intervals along the height direction.

Preferably: be provided with the horizontal pole between a plurality of supporting legs, the axis of rotation lower extreme rotates and runs through the horizontal pole.

Preferably: and a handle is arranged on the upper surface of the top cover far away from the hinged part of the top cover and the box body.

Preferably: and a layer of soundproof cotton is arranged on the inner wall of the protective cover.

Preferably: still including connecting the discharging pipe in bottom half, be connected with on the discharging pipe and filter the ejection of compact subassembly, filter the ejection of compact subassembly including setting up ejection of compact control valve on the discharging pipe and connecting the rose box at the discharging pipe lower extreme, the inside filter screen that is provided with of rose box, the rose box bottom is connected with the unloading pipe, be provided with the unloading valve on the unloading pipe.

Preferably: the filter screen backwashing device is characterized in that a backwashing assembly used for backwashing the filter screen is connected to the blanking pipe, the backwashing assembly comprises an inlet pipe which is connected to the blanking pipe and located above the blanking valve, a water pump and an inlet valve are arranged on the inlet pipe, an outlet pipe is connected to the discharging pipe and located below the discharging control valve, and an outlet valve is arranged on the outlet pipe.

Preferably: the utility model discloses a titanium compound injection device, including top cap, top cap lower surface, top cap, guide pipe, cylinder, rotation post, rotatory nozzle hole, top cap lower surface central point department of putting is provided with and is used for supplying the interpolation subassembly that the stirring was mixed in the even liquid mixture of adding of titanium compound, add the subassembly and include hollow cylinder and pipe, it has the pump body to concatenate on the pipe, the pipe derivation end runs through the top cap top after and is connected with the cylinder, the cylinder bottom is rotated and is connected with the rotation post, it is connected with the middle post that has the cavity to rotate the post lower extreme, be connected with two piece at least auxiliary ducts on the middle post, the rotatory nozzle hole has been seted up on the one end lateral wall of middle post is kept away from to the auxiliary duct, it is rotatory around the middle post center pin that drive middle post and two piece at least auxiliary ducts when rotatory nozzle hole sprays, the auxiliary duct lower surface is provided with a plurality of nozzle holes along length direction equidistance interval in proper order.

Preferably: the auxiliary pipe comprises a first auxiliary pipe and a second auxiliary pipe which are connected with each other, the first auxiliary pipe extends along the circumferential radial line of the center of the middle column, one end of the first auxiliary pipe is fixedly connected with the middle column, and the second auxiliary pipe extends outwards in an inclined mode towards the clockwise or anticlockwise direction of the circumference of the middle column.

The advantageous effects of the present invention will be explained in detail in the embodiments, thereby making the advantageous effects more apparent.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present application.

Fig. 2 is a partially enlarged structural diagram of a portion a in fig. 1.

Fig. 3 is a schematic structural diagram of an add-on component in the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

Example 1:

a novel green polyester catalyst is obtained by carrying out synthesis reaction on a titanium compound, a polyol, a phosphorus compound and a metal compound, wherein the titanium compound is tetrabutyl titanate or tetramethyl titanate, the polyol is ethylene glycol, the metal compound is lithium hydroxide, sodium hydroxide or potassium carbonate, the phosphorus compound is trimethyl phosphite, triethyl phosphite or triphenyl phosphite or phosphoric acid, triisopropyl phosphate, tricresyl phosphate or triphenylphosphine oxide, and in the specific embodiment of the invention, the molar ratio of the titanium compound to the polyol is one to five; the mass ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is one to five; the molar ratio of phosphorus atoms in the phosphorus compound to metal atoms in the metal compound is one to one and a little five.

The novel green polyester catalyst has high long-term storage stability and high catalytic activity, and the molar ratio of the titanium compound to the polyhydric alcohol is one to a little five by setting a proper proportion; the mass ratio of titanium atoms in the titanium compound to phosphorus atoms in the phosphorus compound is one to five; the molar ratio of the phosphorus atoms in the phosphorus compound to the metal atoms in the metal compound is one to one and a little five, so that the stability of the catalyst can be greatly improved under the proportion, and the catalyst is convenient to store for a long time.

Example 2:

the invention also discloses a preparation method of the novel green polyester catalyst, in the specific embodiment of the invention, alcohol, phosphorus compound and metal compound are mixed in a solvent in advance, the reaction time is 1-2 hr, and the reaction temperature is 50-60 ℃; then adding the liquid mixture into a reaction box, uniformly adding a titanium compound into the liquid mixture, stirring and mixing to obtain the catalyst for preparing the polyester. The preparation process is stable, and the titanium compound is added uniformly, so that the titanium compound and the liquid mixture are fully and uniformly mixed, and the high-quality catalyst is obtained by matching and stirring.

Example 3:

as shown in figures 1-3, the invention also discloses a reaction box of a novel green polyester catalyst preparation method, in the specific embodiment of the invention, the reaction box comprises a box body 1 with an open top, a top cover 2 is hinged on the top of the box body 1, a feed hopper 3 is arranged on the top cover 2, a rotating shaft 4 is arranged in the box body 1, the lower end of the rotating shaft 4 rotatably penetrates through the bottom of the box body 1, a plurality of supporting legs 5 are arranged at the outer bottom of the box body 1, a motor 7 is arranged at the bottom of the box body 1, a protective cover 8 is fixed outside the motor 7 and positioned at the bottom of the box body 1, the output end of the motor 7 is connected with a driving shaft 10, a driving fluted disc 11 is connected after the lower end of the driving shaft 10 penetrates through the protective cover 8, a matching fluted disc 12 is arranged at the lower end of the rotating shaft 4, and the driving shaft 10 and the rotating shaft 4 are in matching transmission connection through the driving fluted disc 11 and the matching fluted disc 12, and a plurality of beating blades 13 are arranged on the side wall of the rotating shaft 4 at intervals along the height direction.

When in use, the liquid mixture and the titanium compound are thrown into the box body 1 from the feed hopper 3, the driving shaft 10 rotates under the driving action of the motor 7, the driving shaft 10 is in transmission connection with the rotating shaft 4 through the matching of the driving fluted disc 11 and the matching fluted disc 12, so as to drive the rotating shaft 4 to rotate, a plurality of beating blades 13 are arranged on the side wall of the rotating shaft 4 at intervals along the height direction, the liquid mixture and the titanium compound are efficiently stirred and mixed by the plurality of beating blades 13, when the beating blades 13 are broken down or worn, the beating blades 13 on the rotating shaft 4 can be removed and replaced by opening the top cover 2, the operation is simple and convenient, a protective cover 8 is fixed outside the motor 7 and at the bottom of the box body 1 and used for protecting the motor 7, meanwhile, noise is reduced, the influence of dust on the service life of the motor is prevented, and a comfortable working environment is provided for workers.

In the embodiment of the invention, a cross rod 6 is arranged between a plurality of supporting legs 5, and the lower end of the rotating shaft 4 is rotatably penetrated through the cross rod 6.

In order to improve the stability of 4 rotations of axis of rotation, be provided with horizontal pole 6 between a plurality of supporting legs 5, 4 lower extremes of axis of rotation rotate and run through horizontal pole 6, make 4 rotational stability of axis of rotation through the cooperation of horizontal pole 6 and 1 bottom of box.

In the embodiment of the invention, a handle 19 is arranged on the upper surface of the top cover 2 away from the hinged part with the box body 1.

To further facilitate opening of the lid 2, a handle 19 is provided on the upper surface of the lid 2 remote from the hinge with the housing 1.

In the embodiment of the present invention, a layer of soundproof cotton 9 is disposed on the inner wall of the protective cover 8.

In order to further reduce the operating noise of the motor 7, a layer of soundproof cotton 9 is arranged on the inner wall of the protective cover 8.

In the embodiment of the invention, the device further comprises a discharge pipe 20 connected to the bottom of the box body 1, a filtering discharge assembly is connected to the discharge pipe 20, the filtering discharge assembly comprises a discharge control valve 21 arranged on the discharge pipe 20 and a filter box 22 connected to the lower end of the discharge pipe 20, a filter screen 23 is arranged inside the filter box 22, a discharge pipe 24 is connected to the bottom of the filter box 22, and a discharge valve 25 is arranged on the discharge pipe 24.

Accomplish the material after mixing in box 1 and pass through the ejection of compact of discharging pipe 20, be connected with on discharging pipe 20 and filter ejection of compact subassembly, during the specific use, open ejection of compact control valve 21 ejection of compact, during the material enters into rose box 22 through discharging pipe 20, is crossed particulate matter impurity by the filtration in filter screen 23 department, and the material that accords with the production standard after being filtered is discharged from the unloading pipe 24 of rose box 22 bottom, and unloading valve 25 is opened during the discharge.

In the specific embodiment of the present invention, a backwashing assembly for backwashing the filter screen 23 is connected to the blanking pipe 24, the backwashing assembly includes an inlet pipe 31 connected to the blanking pipe 24 and located above the blanking valve 25, a water pump 32 and an inlet valve 33 are arranged on the inlet pipe 31, an outlet pipe 34 is connected to the discharge pipe 20 and located below the discharge control valve 21, and an outlet valve 35 is arranged on the outlet pipe 34.

After accomplishing the discharge that sieves of material, need regularly wash filter screen 23, in order to avoid appearing the condition of jam, and when wasing, close ejection of compact control valve 21 and unloading valve 25, at this moment, open water pump 32, inlet valve 33 and play valve 35, under the water pump 32 effect, pass through filter screen 23 with water through advancing pipe 31 from lower to upper, make the particulate matter impurity of filter screen 23 upper surface washed, discharge through exit tube 34, after accomplishing the washing, close upper water pump 32, inlet valve 33 and play valve 35, open ejection of compact control valve 21 and unloading valve 25 and carry out normal screening material, practicality and convenient to use.

Example 4:

the difference from the embodiment 3 is that in the embodiment of the present invention, an adding component for uniformly adding the titanium compound into the liquid mixture for stirring and mixing is arranged at the center of the lower surface of the top cover 2, the adding component comprises a hollow cylinder 41 and a conduit 51, a pump body 52 is connected in series on the conduit 51, the outlet end of the conduit 51 penetrates the top of the top cover 2 and is connected with the column 41, the bottom of the column 41 is rotatably connected with a rotating column 411, the lower end of the rotary column 411 is connected with a middle column 412 with a chamber, at least two secondary pipes 42 are connected on the middle column 412, the side wall of one end of the auxiliary pipe 42 far away from the middle column 412 is provided with a rotary spray hole 43, when spraying, the rotary spray hole 43 drives the middle column 412 and at least two auxiliary pipes 42 to rotate around the central axis of the middle column 412, the lower surface of the secondary pipe 42 is sequentially provided with a plurality of spray holes 44 at equal intervals along the length direction.

When in use, a liquid mixture is put into the box body 1 from the feed hopper 3, the driving shaft 10 rotates under the driving action of the motor 7, the driving shaft 10 and the rotating shaft 4 are in matching transmission connection through the driving fluted disc 11 and the matching fluted disc 12, so as to drive the rotating shaft 4 to rotate, the liquid mixture is efficiently stirred and mixed by utilizing a plurality of beating blades 13, at the moment, a titanium compound is pumped and sent into the cylinder 41 under the pumping action of the pump body 52, the bottom of the cylinder 41 is rotatably connected with the rotating column 411, the lower end of the rotating column 411 is connected with the middle column 412 with a cavity, the middle column 412 is connected with at least two secondary pipes 42, the side wall of one end of the secondary pipe 42 far away from the middle column 412 is provided with a rotating spray hole 43, one part of the titanium compound is sprayed through the rotating spray hole 43, the other part of the titanium compound is sprayed through a plurality of spray holes 44, and the middle column 412 and the at least two secondary pipes 42 are driven to rotate around the central axis of the middle column 412 when the rotating spray hole 43 is sprayed, when a plurality of spray orifices 44 spout, supply the stirring to mix in adding liquid mixture with titanium compound is even, this structure has reduced and has set up corresponding driver part in addition and additionally drive two piece at least auxiliary tubes 42 rotatory, carries out evenly to add titanium compound, simple structure and reduce the cost, and it is simple and convenient to use, and titanium compound's mixing degree of consistency is high, and whole preparation quality promotes greatly.

In the embodiment of the present invention, the secondary pipe 42 includes a first secondary pipe 421 and a second secondary pipe 422 connected to each other, the first secondary pipe 421 extends along a circumferential radial line centered on the middle column 412, one end of the first secondary pipe 421 is fixedly connected to the middle column 412, and the second secondary pipe 422 extends obliquely outward in a clockwise or counterclockwise direction of the circumference of the middle column 412.

With the above arrangement, the second sub-pipe 422 extends obliquely outward in the clockwise or counterclockwise direction of the circumference of the middle column 412, so that the driving effect of driving the sub-pipe 42 to rotate is enhanced, and the rotation is more stable.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.