CN114345166B - Preparation device of Pickering emulsion - Google Patents
Preparation device of Pickering emulsion Download PDFInfo
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- CN114345166B CN114345166B CN202210072190.2A CN202210072190A CN114345166B CN 114345166 B CN114345166 B CN 114345166B CN 202210072190 A CN202210072190 A CN 202210072190A CN 114345166 B CN114345166 B CN 114345166B
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Abstract
The invention discloses a preparation device of Pickering emulsion, which relates to the technical field of preparation of Pickering emulsion, has the advantage of adding required liquid while stirring, and has the technical scheme that the preparation device comprises the following main points: including the churn that the opening faces upwards and can dismantle the connection at the churn opening part and seal the open-ended closure plate, seted up stirring hole and notes liquid hole on the closure plate, the closure plate up end is equipped with the puddler through stirring hole slope stirring and sets up in annotating the liquid hole top and with annotate the support ring of liquid hole intercommunication, the support ring upper end is rotated and is connected with and annotates the liquid pipe, it drives when stirring hole slope stirring to be equipped with the drive puddler on the closure plate and annotates liquid pipe pivoted driving piece.
Description
Technical Field
The invention relates to the technical field of preparation of Pickering emulsion, in particular to a preparation device of Pickering emulsion.
Background
Pickering emulsion refers to an emulsion obtained by using ultrafine solid particles as an emulsifier, and is also called Pickering emulsion. Compared with the emulsion stabilized by the traditional surfactant, the Pickering emulsion has the advantages of strong interface stability, reduced foaming problem, reproducibility, low toxicity, low cost and the like, and in recent years, the novel application of the particle emulsifier in the aspects of food, cosmetics and pharmacy is attracted by much attention.
Chinese patent No. CN106832350B discloses a method for preparing Pickering emulsion with stable starch nanoparticles, comprising the following steps: (1) preparing a starch nanoparticle emulsifier: selecting starch with 20-40% of straight chain content, adding water for gelatinization, dropwise adding anhydrous ethanol into the gelatinized liquid while stirring, controlling the rotation speed of a stirrer to be 500-1500rpm, continuously stirring for 1-5h after the titration is finished, centrifuging the suspension, precipitating and freeze-drying to obtain a starch nanoparticle emulsifier; (2) preparation of Pickering emulsion: adding the starch nanoparticle emulsifier into the oil-water mixed solution, mixing, controlling the concentration of the starch nanoparticles to be 0.25-2 wt%, controlling the temperature of the mixed solution to be 15-35 ℃, and homogenizing the mixed solution by using a high-speed homogenizer to obtain the Pickering emulsion.
However, in the above-mentioned production process, there is a case where stirring is performed while dropping a liquid, and therefore, an apparatus capable of achieving this function is urgently required.
Disclosure of Invention
In view of the technical shortcomings, the invention aims to provide a preparation device of Pickering emulsion, which has the advantage of adding required liquid while stirring.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a Pickering emulsion preparation device which comprises a stirring cylinder with an upward opening and a sealing plate which is detachably connected to the opening of the stirring cylinder and seals the opening, wherein the sealing plate is provided with a stirring hole and a liquid injection hole, the upper end surface of the sealing plate is provided with a stirring rod which is obliquely stirred through the stirring hole and a support ring which is arranged above the liquid injection hole and is communicated with the liquid injection hole, the upper end of the support ring is rotatably connected with a liquid injection pipe, and the sealing plate is provided with a driving piece which drives the stirring rod to obliquely stir through the stirring hole and simultaneously drives the liquid injection pipe to rotate.
Through adopting above-mentioned technical scheme, put into the churn with required stirring liquid, the opening of churn is sealed to the closing plate afterwards, driving piece drive puddler rotates, make liquid annotate the setting person of liquid pipe when being stirred by liquid toward liquid by dropwise add liquid, pivoted notes liquid pipe this moment reduces the liquid adhesion on annotating the pipe wall of liquid pipe, the advantage of adding required liquid when having the stirring, raise the efficiency, the puddler slope stirring has increased the stirring scope of puddler in addition, also make the liquid mobility increase, be convenient for improve the stirring efficiency of liquid.
Preferably: the driving piece comprises a vertical plate arranged at the upper end of the sealing plate, a bearing ring communicated with the stirring hole is arranged on the vertical plate, a transition ring concentric with the bearing ring is arranged at the upper end of the bearing ring of the vertical plate, a connecting block is arranged at the upper end of the transition ring of the vertical plate, a rotating shaft is rotatably connected onto the connecting block, one end of the rotating shaft extends out of the connecting block, the other end of the rotating shaft is provided with an inclined connecting column, the upper end of the stirring rod is rotatably connected into the connecting column, synchronizing wheels are arranged on the outer walls of the liquid injection pipe and the rotating shaft, the two synchronizing wheels are connected through an annular belt, one end of the stirring rod far away from the connecting column penetrates through the transition ring and the bearing ring to enter the stirring cylinder, a first gear is coaxially arranged on the outer wall of the liquid injection pipe, a plurality of driving teeth meshed with the first gear are circumferentially arranged on the outer wall of the stirring rod, the number of the teeth of the first gear is greater than the number of the driving teeth and the width of the first gear and the width of the driving teeth, the drive teeth are located between the transition ring and the bearing ring.
Preferably: the puddler all is equipped with on the outer wall that lies in between transition ring and the bearing ring and all is equipped with the sphere with transition ring and bearing ring end face contact on conflict board and two conflict boards contradicted with transition ring and bearing ring end face contact, transition ring and bearing ring have all been seted up on relative both ends face and have been supplied the sphere along with puddler pivoted arcwall face.
Preferably: the bearing ring is connected with the support ring through the first rod, the outer wall of the transition ring is provided with the second rod, and one end, far away from the transition ring, of the second rod is rotatably connected with the liquid injection pipe.
Preferably: the stirring rod is internally provided with a through hole which runs through the upper end and the lower end of the stirring rod, one end of the stirring rod extends out of the connecting column, and the extending end is provided with an injection piece which injects liquid into the through hole in the stirring rod.
Preferably: the injection piece is including the rubber buffer of tight connection at the through-hole upper end wall, the rubber buffer includes the rubber column, and the rubber column is connected with the through-hole inner wall is tight, rubber column upper end is equipped with the rubber membrane that seals the rubber column and contradict with the puddler outer wall, it has hollow plastics needle to peg graft on the rubber membrane, the one end that the rubber membrane was kept away from to the plastics needle is equipped with the liquid storage tube, it is connected with sealed post to slide in the storage tube, be equipped with the push rod that extends the storage tube on the sealed post.
Preferably: the upper end of the connecting block is provided with a motor for driving the rotating shaft to rotate, and the connecting column is provided with a control piece for controlling the rotating speed of the motor.
Preferably: the stirring device is characterized in that a connecting sleeve is connected to the outer wall of one end, located in the stirring cylinder, of the stirring rod in a threaded manner, a plurality of L-shaped stirring blades are arranged on the outer wall of the connecting sleeve in the circumferential direction, and one end of each stirring blade extends out of the lower end of the connecting sleeve.
Preferably: the control is including setting up the distance inductor at the spliced pole up end, all be equipped with the adjusting module of control motor work on the motor, when the distance inductor gathered storage tube injection liquid, the distance of storage tube to spliced pole up end was D to transmit the adjusting module with the distance D who gathers, adjusting module is used for generating control signal according to distance D, the motor is used for the rotational speed according to control signal control motor.
Preferably: the preset distance comprises a first preset value and a second preset value, wherein the first preset value is the distance from the storage pipe to the upper end face of the connecting column when the storage pipe injects liquid into the stirring rod;
the second preset value is the distance from the connecting block to the upper end face of the connecting column;
the control signal comprises a first signal and a second signal, when the distance D is smaller than a second preset value, an adjusting module on the motor generates the first signal according to the distance D, and when the distance D is larger than the first preset value and equal to or larger than the second preset value, the adjusting module on the motor generates the second signal according to the distance D;
the motor responds to the first signal to control the rotating speed of the motor to be V1, the motor responds to the second signal to control the rotating speed of the motor to be V2, and V2 is larger than V1.
The invention has the beneficial effects that: put into the churn with required stirring liquid, the opening of churn is sealed to the closing plate afterwards, driving piece drive puddler rotates, make liquid annotate the setting convenient to use person of liquid pipe when being stirred toward liquid by dropwise add liquid, pivoted notes liquid pipe this moment reduces the liquid adhesion on annotating the pipe wall of liquid pipe, the advantage of adding required liquid when the stirring has been had, and the efficiency is improved, in addition the puddler slope stirring has increased the stirring scope of puddler, also make the liquid mobility increase, be convenient for improve the stirring efficiency of liquid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present embodiment;
FIG. 2 is a schematic structural view of the closing plate according to the present embodiment;
FIG. 3 is a schematic structural view of a stirring rod embodying the present embodiment;
fig. 4 is a schematic structural view of the plastic needle according to the present embodiment.
Description of reference numerals:
in the figure: 1. a mixing drum; 11. a closing plate; 12. a stirring hole; 121. a liquid injection hole; 13. a stirring rod; 131. a support ring; 132. a liquid injection pipe; 14. a vertical plate; 141. a load-bearing ring; 142. a transition ring; 143. connecting blocks; 144. a rotating shaft; 145. connecting columns; 15. a synchronizing wheel; 151. a belt; 16. a first gear; 161. a drive tooth; 162. a touch plate; 163. spherical surface; 17. a first lever; 171. a second lever; 18. a through hole; 181. a rubber column; 182. a rubber film; 183. a plastic needle; 184. a storage tube; 185. sealing the column; 186. a push rod; 19. connecting sleeves; 191. a stirring blade; 192. a distance sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation device of Pickering emulsion comprises a stirring cylinder 1 with an upward opening and a closing plate 11 which is detachably connected to the opening of the stirring cylinder 1 and seals the opening, wherein a stirring hole 12 and a liquid injection hole 121 are formed in the closing plate 11, a stirring rod 13 which can obliquely stir through the stirring hole 12 and a support ring 131 which is arranged above the liquid injection hole 121 and communicated with the liquid injection hole 121 are arranged on the upper end face of the closing plate 11, a liquid injection pipe 132 is rotatably connected to the upper end of the support ring 131, at the moment, the liquid injection pipe 132 conveys liquid into the stirring cylinder 1 through the support ring 131, and a driving piece which drives the stirring rod 13 to obliquely stir through the stirring hole 12 and simultaneously drives the liquid injection pipe 132 to rotate is arranged on the closing plate 11.
As shown in fig. 1 and fig. 2, the liquid to be stirred is put into the stirring cylinder 1, then the closing plate 11 closes the opening of the stirring cylinder 1, the driving member drives the stirring rod 13 to rotate, so that the setting of the liquid injection pipe 132 is convenient for the user to drop the liquid toward the liquid while the liquid is stirred, at this time, the rotating liquid injection pipe 132 reduces the adhesion of the liquid on the pipe wall of the liquid injection pipe 132, the advantage of adding the liquid while stirring is provided, the efficiency is improved, in addition, the stirring range of the stirring rod 13 is increased by the inclined stirring of the stirring rod 13, the fluidity of the liquid is also increased, and the stirring efficiency of the liquid is improved. The closing plate 11 can be connected with the wall of the opening at the upper end of the mixing drum 1 in a bolt or clamping way.
As shown in fig. 1 and fig. 3, the driving member includes a vertical plate 14 disposed on the upper end of the sealing plate 11, a bearing ring 141 communicated with the stirring hole 12 is disposed on the vertical plate 14, a transition ring 142 concentric with the bearing ring 141 is disposed on the upper end of the bearing ring 141 of the vertical plate 14, a connecting block 143 is disposed on the upper end of the transition ring 142 of the vertical plate 14, a rotating shaft 144 is rotatably connected to the connecting block 143, one end of the rotating shaft 144 extends out of the connecting block 143, an inclined connecting column 145 is disposed on the other end of the rotating shaft 145, the diameter of the outer wall of the rotating shaft 144 connected to the connecting column 145 is greater than the diameter of the end of the rotating shaft 144 extending out of the connecting block 143, so as to facilitate the stirring rod 13 to rotate, the upper end of the stirring rod 13 is rotatably connected to the connecting column 145, synchronizing wheels 15 are disposed on the outer walls of the liquid injection pipe 132 and the rotating shaft 144, two synchronizing wheels 15 are connected by an endless belt 151, the upper end of the liquid injection pipe 132 extends out of the upper end of the synchronizing wheel 15, one end of the stirring rod 13 far from the connecting column 145 passes through the transition ring 142 and the bearing ring 141 and enters the stirring cylinder 1, at this time, the length direction of the stirring rod 13 and the axis of the rotating shaft 144 are relatively inclined, the rotating shaft 144 rotates to enable the stirring rod 13 to revolve around the rotating shaft 144, the first gear 16 is coaxially arranged on the outer wall of the liquid injection pipe 132, a plurality of driving teeth 161 meshed with the first gear 16 are circumferentially arranged on the outer wall of the stirring rod 13, the number of the first gear 16 is greater than the number of the driving teeth 161, the width of the first gear 16 and the width of the driving teeth 161 are greater, and the driving teeth 161 are located between the transition ring 142 and the bearing ring 141.
As shown in fig. 1 and fig. 3, when the rotating shaft 144 is rotated manually by a user, the stirring rod 13 is driven to revolve around the axis of the rotating shaft 144, at this time, the first gear 16 is meshed with the driving tooth 161, so that the first gear 16 drives the stirring rod 13 to rotate, at this time, the rotation and revolution of the stirring rod 13 increase the stirring efficiency of the stirring rod 13, the width of the first gear 16 is greater than the width of the driving tooth 161, so that when the stirring rod 13 revolves around the rotating shaft 144, the driving tooth 161 is always meshed with the first gear 16, and the stirring hole 12, the transition ring 142 and the bearing ring 141 are all used for the stirring rod 13 to stir obliquely, and the structure is ingenious. Meanwhile, the outer wall of one end of the stirring rod 13, which is positioned in the stirring cylinder 1, is in threaded connection with a connecting sleeve 19, a plurality of L-shaped stirring blades 191 are circumferentially arranged on the outer wall of the connecting sleeve 19, and one end of each stirring blade 191 extends out of the lower end of the connecting sleeve 19.
As shown in fig. 1 and fig. 3, the outer wall of the stirring rod 13 between the transition ring 142 and the bearing ring 141 is provided with two abutting plates 162 abutting against the end surfaces of the transition ring 142 and the bearing ring 141, the two abutting plates 162 are provided with spherical surfaces 163 contacting the end surfaces of the transition ring 142 and the bearing ring 141, and the two opposite end surfaces of the transition ring 142 and the bearing ring 141 are provided with arc surfaces for the spherical surfaces 163 to rotate along with the stirring rod 13. The arrangement of the spherical surface 163 and the arc surface facilitates the stirring rod 13 to slide the spherical surface 163 in the arc surface during revolution, so as to provide a supporting force for the stirring rod 13, thereby facilitating the inclined stirring of the stirring rod 13.
As shown in FIGS. 1 and 3, the bearing ring 141 and the supporting ring 131 are connected by a first rod 17, a second rod 171 is arranged on the outer wall of the transition ring 142, and one end of the second rod 171, which is far away from the transition ring 142, is rotatably connected with the liquid injection pipe 132. The arrangement of the first rod 17 and the second rod 171 at this time facilitates the stabilization of the entire structure.
As shown in fig. 1 and 4, a through hole 18 penetrating through the upper and lower ends of the stirring rod 13 is formed in the stirring rod 13, a connection post 145 extends from one end of the stirring rod 13, and an injection member for injecting liquid into the through hole 18 in the stirring rod 13 is provided at the extended end. The user can now also introduce the desired liquid into the mixing drum 1 through the through-opening 18, the injection element being arranged so as to facilitate the liquid flow into the through-opening 18.
As shown in fig. 1 and 4, the injection part comprises a rubber plug tightly connected to the upper end wall of the through hole 18, the rubber plug comprises a rubber column 181, the rubber column 181 is tightly connected to the inner wall of the through hole 18, the upper end of the rubber column 181 is provided with a rubber film 182 which seals the rubber column 181 and is abutted to the outer wall of the stirring rod 13, a hollow plastic needle 183 is inserted into the rubber film 182, one end of the plastic needle 183, which is far away from the rubber film 182, is provided with a liquid storage tube 184, the storage tube 184 is connected with a sealing column 185 in a sliding manner, and the sealing column 185 is provided with a push rod 186 extending out of the storage tube 184. At this time, the sealing column 185 sets the side of the storage tube 184 connected with the plastic needle 183 as a positive pressure region, which is also a region for storing liquid, and the user pushes the push rod 186, so that the push rod 186 drives the sealing column 185 to move towards the plastic needle 183, and further injects the liquid into the rubber column 181 through the plastic needle 183, and at this time, the plastic needle 183 is inserted into the plastic film, and further, the liquid flows into the through hole 18 of the stirring rod 13. The operation is convenient, when the user needs to inject the liquid through the stirring rod 13, the user holds the storage tube 184 to insert the plastic needle 183 into the plastic film and then pushes the push rod 186.
The upper end of the connecting block 143 is provided with a motor for driving the rotating shaft 144 to rotate, and the connecting column 145 is provided with a control piece for controlling the rotating speed of the motor. At this moment, the motor can drive the rotating shaft 144 to rotate, and the intelligence is improved. The control member can control the rotation speed of the motor at this time so as to meet the requirement.
The control piece is including setting up the distance inductor 192 at spliced pole 145 up end, all is equipped with the adjusting module of control motor work on the motor, and when the distance inductor 192 gathered storage tube 184 injection liquid, the distance of storage tube 184 to spliced pole 145 up end was D to transmit the adjusting module with the distance D who gathers, adjusting module is used for generating control signal according to distance D, and the motor is used for the rotational speed according to control signal control motor.
The preset distance comprises a first preset value and a second preset value, wherein the first preset value is the distance from the storage pipe 184 to the upper end face of the connecting column 145 when the storage pipe 184 injects liquid into the stirring rod 13;
the second preset value is the distance from the connecting block 143 to the upper end face of the connecting column 145;
the control signals comprise a first signal and a second signal, when the distance D is smaller than a second preset value, an adjusting module on the motor generates the first signal according to the distance D, and when the distance D is larger than the first preset value and equal to or larger than the second preset value, the adjusting module on the motor generates the second signal according to the distance D;
the motor responds to the first signal to control the rotation speed of the motor to be V1, the motor responds to the second signal to control the rotation speed of the motor to be V2, and V2 is larger than V1.
At this moment, when the user inserts plastic needle 183 into the plastic film, the rotating speed of the motor is required to be reduced when liquid is injected into stirring rod 13, so that the user can push rod 186, when the user pulls out plastic needle 183, the rotating speed is increased by distance sensor 192, so that stirring rod 13 can stir, the distance from connecting column 145 can be collected by distance sensor 192, the rotating speed of the motor does not need to be changed at this moment, and the plastic needle still can rotate at the speed of V2.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. The preparation device of Pickering emulsion is characterized by comprising a stirring cylinder (1) with an upward opening and a closing plate (11) which is detachably connected to the opening of the stirring cylinder (1) and is closed to the opening, wherein a stirring hole (12) and a liquid injection hole (121) are formed in the closing plate (11), a stirring rod (13) which is obliquely stirred through the stirring hole (12) and a support ring (131) which is arranged above the liquid injection hole (121) and is communicated with the liquid injection hole (121) are arranged on the upper end face of the closing plate (11), a liquid injection pipe (132) is rotatably connected to the upper end of the support ring (131), and a driving piece which drives the stirring rod (13) to obliquely stir through the stirring hole (12) and simultaneously drives the liquid injection pipe (132) to rotate is arranged on the closing plate (11);
the driving part comprises a vertical plate (14) arranged at the upper end of a closed plate (11), a bearing ring (141) communicated with the stirring hole (12) is arranged on the vertical plate (14), a transition ring (142) concentric with the bearing ring (141) is arranged at the upper end of the bearing ring (141) of the vertical plate (14), a connecting block (143) is arranged at the upper end of the transition ring (142) of the vertical plate (14), a rotating shaft (144) is rotatably connected onto the connecting block (143), one end of the rotating shaft (144) extends out of the connecting block (143), the other end of the rotating shaft (144) is provided with an inclined connecting column (145), the upper end of the stirring rod (13) is rotatably connected into the connecting column (145), synchronizing wheels (15) are arranged on the outer walls of the liquid injection pipe (132) and the rotating shaft (144), the two synchronizing wheels (15) are connected through an annular belt (151), one end, far away from the connecting column (145), of the stirring rod (13), penetrates through the transition ring (142) and the bearing ring (141) to enter the stirring cylinder (1), the outer wall of the liquid injection pipe (132) is coaxially provided with a first gear (16), the outer wall of the stirring rod (13) is circumferentially provided with a plurality of driving teeth (161) meshed with the first gear (16), the number of the first gear (16) is greater than the number of the driving teeth (161), the width of the first gear (16) is equal to the width of the driving teeth (161), and the driving teeth (161) are positioned between the transition ring (142) and the bearing ring (141);
a through hole (18) penetrating through the upper end and the lower end of the stirring rod (13) is formed in the stirring rod (13), a connecting column (145) extends out of one end of the stirring rod (13), and an injection piece for injecting liquid into the through hole (18) in the stirring rod (13) is arranged at the extended end;
the injection part comprises a rubber plug tightly connected to the upper end wall of the through hole (18), the rubber plug comprises a rubber column (181), the rubber column (181) is tightly connected with the inner wall of the through hole (18), a rubber film (182) which seals the rubber column (181) and is abutted against the outer wall of the stirring rod (13) is arranged at the upper end of the rubber column (181), a hollow plastic needle (183) is inserted into the rubber film (182), a liquid storage tube (184) is arranged at one end, far away from the rubber film (182), of the plastic needle (183), a sealing column (185) is connected into the storage tube (184) in a sliding manner, and a push rod (186) extending out of the storage tube (184) is arranged on the sealing column (185);
a motor for driving the rotating shaft (144) to rotate is arranged at the upper end of the connecting block (143), and a control piece for controlling the rotating speed of the motor is arranged on the connecting column (145);
the control piece is including setting up distance inductor (192) at spliced pole (145) up end, all be equipped with the adjusting module of control motor work on the motor, when distance inductor (192) gathered storage tube (184) injection liquid, the distance of storage tube (184) to spliced pole (145) up end is D to transmit the distance D who gathers to adjusting module, adjusting module is used for generating control signal according to distance D, the motor is used for the rotational speed according to control signal control motor.
2. The preparation device of Pickering emulsion according to claim 1, wherein the outer wall of the stirring rod (13) between the transition ring (142) and the bearing ring (141) is provided with contact plates (162) which are abutted against the end faces of the transition ring (142) and the bearing ring (141), the two contact plates (162) are provided with spherical surfaces (163) which are contacted with the end faces of the transition ring (142) and the bearing ring (141), and the two opposite end faces of the transition ring (142) and the bearing ring (141) are provided with arc-shaped surfaces for the spherical surfaces (163) to rotate along with the stirring rod (13).
3. The device for preparing Pickering emulsion according to claim 2, wherein the bearing ring (141) is connected with the support ring (131) through a first rod (17), the outer wall of the transition ring (142) is provided with a second rod (171), and one end of the second rod (171) far away from the transition ring (142) is rotatably connected with the liquid injection pipe (132).
4. The device for preparing Pickering emulsion according to claim 1, wherein the outer wall of the stirring rod (13) at one end in the stirring cylinder (1) is connected with a connecting sleeve (19) through threads, a plurality of L-shaped stirring blades (191) are circumferentially arranged on the outer wall of the connecting sleeve (19), and one end of each stirring blade (191) extends out of the lower end of the connecting sleeve (19).
5. The apparatus for preparing Pickering emulsion according to claim 1, wherein the predetermined distance includes a first predetermined value and a second predetermined value, the first predetermined value being a distance from the storage tube (184) to an upper end surface of the connecting column (145) when the storage tube (184) injects liquid into the stirring rod (13);
the second preset value is the distance from the connecting block (143) to the upper end face of the connecting column (145);
the control signal comprises a first signal and a second signal, when the distance D is smaller than a second preset value, an adjusting module on the motor generates the first signal according to the distance D, and when the distance D is larger than the first preset value and equal to or larger than the second preset value, the adjusting module on the motor generates the second signal according to the distance D;
the motor responds to the first signal to control the rotating speed of the motor to be V1, the motor responds to the second signal to control the rotating speed of the motor to be V2, and V2 is larger than V1.
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