Agitator for hollow feed

Abstract

The utility model discloses a kind of hollow feeding's stirring device, including stirring rod and stirring blade, first flow channel is stretched in the stirring rod inside along the up-down direction of stirring rod, the top of stirring rod has the import that communicate with first flow channel;One end of stirring blade is connected with the side wall of stirring rod, second flow channel is communicated with first flow channel in the stirring blade, the other end of stirring blade has the export that communicate with second flow channel;The stirring rod of the utility model has first flow channel and the stirring blade has second flow channel, and then the various kinds of liquid of reaction kettle outside can be entered first flow channel and second flow channel by import, then from export into reaction kettle, in the process of feeding, various kinds of liquid of different density can be premixed in first flow channel and second flow channel, and then avoid affecting production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, and in particular to a hollow feed mixing device. Background Technology

[0002] In industries such as chemical, pharmaceutical, and food processing, reaction vessels are common equipment. Existing reaction vessels involve adding various liquids of different densities externally, with the stirring paddle only providing a single stirring function. During the feeding process, liquids that haven't reached the required stirring height cannot be mixed evenly, thus affecting production efficiency. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a hollow-feed mixing device.

[0004] The technical solution of this utility model is as follows: it includes a stirring rod and a stirring blade. The stirring rod has a first flow channel extending in the vertical direction of the stirring rod, and the top of the stirring rod has an inlet communicating with the first flow channel. One end of the stirring blade is connected to the side wall of the stirring rod, and the stirring blade has a second flow channel communicating with the first flow channel. The other end of the stirring blade has an outlet communicating with the second flow channel.

[0005] Furthermore, there are multiple stirring blades, which are spaced apart along the circumferential direction of the stirring rod.

[0006] Furthermore, the vertical cross-section of the stirring blade is in the shape of a ring racetrack.

[0007] Furthermore, the stirring device also includes an opening and closing component. A mounting frame is fixed inside the second flow channel. The opening and closing component is located outside the other end of the stirring blade. One end of the opening and closing component is hinged to the mounting frame, and the other end of the opening and closing component can be magnetically fixed to the other end of the stirring blade so that the opening and closing component can seal the outlet.

[0008] Furthermore, the stirring device also includes an opening and closing component. A mounting frame is fixed inside the second flow channel. The opening and closing component is located outside the other end of the stirring blade. One end of the opening and closing component is hinged to the mounting frame. A spring is provided between the other end of the opening and closing component and the mounting frame so that the opening and closing component can seal the outlet.

[0009] Furthermore, there are multiple opening and closing components, which are arranged sequentially along the circumferential direction of the stirring blade.

[0010] Furthermore, The first flow channel includes a contraction section and an expansion section, wherein the upper end of the expansion section is connected to the lower end of the contraction section; The stirring device further includes a mixing structure disposed on the stirring rod and located below the expansion section. The mixing structure includes a stirring element rotatably disposed in the first flow channel and a driving structure for driving the stirring element to rotate.

[0011] Furthermore, the stirring component includes a ring body and a plurality of stirring elements disposed on the inner wall of the ring body; The hybrid structure further includes a receiving element installed in the first flow channel. The receiving element has a mounting cavity, and both the upper and lower ends of the mounting cavity are connected to the first flow channel. The mounting cavity has a support element that can support the annular body to rotate along the inner wall of the mounting cavity.

[0012] Furthermore, the first flow channel has a blocking block located below the mixing structure, and the blocking block has a plurality of first connecting holes extending in the vertical direction along the blocking block.

[0013] Furthermore, one end of the stirring blade is connected to the side wall of the lower end of the stirring rod, and the bottom of the inside of the stirring rod has a protrusion, the protrusion has a downwardly recessed recess, and the upper profile of the vertical cross-section of the recess is a concave arc shape.

[0014] The hollow feed mixing device according to this utility model has at least the following technical effects: 1. The stirring rod has a first flow channel and the stirring blade has a second flow channel. Thus, various liquids outside the reactor can enter the first and second flow channels through the inlet and then enter the reactor from the outlet. During the feeding process, various liquids of different densities can be pre-mixed in the first and second flow channels, thereby avoiding affecting production efficiency.

[0015] 2. A contraction section, an expansion section, and a stirring element are sequentially arranged in the vertical direction inside the stirring rod. When liquids of different densities enter the stirring rod from the inlet, the gradual contraction of the orifice of the contraction section allows the liquids of different densities to mix. The gradual expansion of the orifice of the expansion section and the certain distance between the expansion section and the mixing structure slow down the liquids. As a result, the liquids of different densities can be further mixed in the first flow channel between the expansion section and the mixing structure. The stirring element can agitate the liquids of different densities.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Additional aspects and advantages of this utility model will become apparent and readily understood from the description of the technical solution in conjunction with the following drawings, wherein: Figure 1 This is a schematic diagram of the connection between the stirring rod and the stirring blade. Figure 2 A cross-sectional view showing the connection between the stirring rod and the stirring blade, and the presence of a mixing structure, a blocking block, and a protrusion. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a top view of the mixing component; Figure 5 A schematic diagram of a structure in which multiple opening and closing components are installed on a stirring blade; Figure 6 A front view showing the connection between the stirring rod and the stirring blades; Figure 7 This is a top view showing the connection between the stirring rod and the stirring blades.

[0018] Reference numerals: stirring rod 100, first flow channel 110, inlet 120, contraction section 130, expansion section 140, blocking block 150, first connecting hole 151, protrusion 160, recess 170, mixing structure 200, upper opening 201, second connecting hole 202, stirring component 210, annular body 211, stirring body 212, accommodating component 220, mounting cavity 221, support component 222, rotating cavity 2221, notch 2222, coil 230, sliding component 240, sealing component 250, stirring blade 300, opening and closing component 301, spring 302, second flow channel 310, mounting bracket 311, outlet 320. Detailed Implementation The technical solution of this utility model is described in detail below. Examples of the technical solution are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The technical solution described below with reference to the accompanying drawings is exemplary and is only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Reference Figure 1 , 2 As shown, the stirring device provided in the embodiment of this utility model includes a stirring rod 100 and a stirring blade 300. The stirring rod 100 has a first flow channel 110 extending in the vertical direction of the stirring rod 100, and the top of the stirring rod 100 has an inlet 120 communicating with the first flow channel 110. One end of the stirring blade 300 is connected to the side wall of the stirring rod 100, and the stirring blade 300 has a second flow channel 310 communicating with the first flow channel 110. The other end of the stirring blade 300 has an outlet 320 communicating with the second flow channel 310.

[0023] The stirring rod 100 has a first flow channel 110 and the stirring blade 300 has a second flow channel 310. Thus, various liquids of different densities outside the reactor can enter the first flow channel 110 and the second flow channel 310 through the inlet 120, and then enter the reactor from the outlet 320. During the feeding process, various liquids of different densities can be premixed in the first flow channel 110 and the second flow channel 310, thereby avoiding affecting production efficiency.

[0024] During operation, liquids of various densities enter the first flow channel 110 from the inlet 120, then enter the second flow channel 310 of the stirring blade 300 from the lower end of the first flow channel 110, and are discharged from the outlet 320.

[0025] Specifically, the stirring device also includes a reaction vessel (not shown in the figure) and a driving device (not shown in the figure). The stirring rod 100 is rotatably mounted on the reaction vessel. The upper end of the stirring rod 100 is located outside the top of the reaction vessel, and the lower end of the stirring rod 100 and the stirring blade 300 are located inside the reaction vessel. The driving device is mounted on the top of the reaction vessel and is used to drive the stirring rod 100 to rotate.

[0026] Specifically, the driving device includes a drive motor and a coupling. The top of the stirring rod 100 is connected to the drive motor through the coupling. When working, the drive motor starts and drives the stirring rod 100 to rotate through the coupling.

[0027] Specifically, the diameter of the stirring rod 100 is 1 / 3 to 1 / 2 of the diameter of the reactor.

[0028] Specifically, the flow rate of export 320 is 1 / 4 of the flow rate of import 120, thereby ensuring the stability of the overall system flow.

[0029] Furthermore, such as Figure 1 As shown, there are multiple stirring blades 300, which are spaced apart along the circumference of the stirring rod 100. By having multiple stirring blades 300, the various liquids in the reaction vessel can be fully mixed.

[0030] Furthermore, such as Figure 1 As shown, the vertical cross-section of the stirring blade 300 is in the shape of a ring racetrack. The shape of the stirring blade 300 makes the flow of the liquid smoother.

[0031] Furthermore, such as Figure 2 As shown, it also includes an opening and closing element 301. A mounting bracket 311 is fixed inside the second flow channel 310. The opening and closing element 301 is located outside the other end of the stirring blade 300. One end of the opening and closing element 301 is hinged to the mounting bracket 311, and the other end of the opening and closing element 301 can be magnetically fixed to the other end of the stirring blade 300 so that the opening and closing element 301 can seal the outlet 320.

[0032] One end of the opening and closing element 301 is rotatably mounted on the mounting bracket 311, and the other end of the opening and closing element 301 can be connected to the other end of the stirring blade 300 by magnetic force. When the stirring rod 100 rotates, the other end of the opening and closing element 301 can overcome the magnetic force under the action of centrifugal force, and the other end of the opening and closing element 301 is no longer connected to the other end of the stirring blade 300. Thus, the opening and closing element 301 opens the outlet 320 to realize the discharge of the liquid.

[0033] Understandably, when the stirring rod 100 rotates at a low speed, the centrifugal force is small, the opening degree of the opening and closing part 301 is small, and the output is relatively small, which is suitable for working conditions that require fine stirring. When the stirring rod 100 increases its rotation speed, the centrifugal force increases, the opening degree of the opening and closing part 301 increases accordingly, and the output increases, which is suitable for working conditions that require rapid stirring and mixing.

[0034] Specifically, the other end of the stirring blade 300 is made of a magnetic material (e.g., made of iron) or the entire stirring blade 300 is made of a magnetic material. The other end of the opening and closing member 301 is provided with a magnet, and the other end of the opening and closing member 301 is attracted to the other end of the stirring blade 300 by the magnet. Alternatively, the other end of the stirring blade 300 is provided with a magnet, and the other end of the opening and closing member 301 is made of a magnetic material, and the other end of the opening and closing member 301 is attracted to the magnet at the other end of the stirring blade 300.

[0035] Furthermore, such as Figure 2 As shown, it also includes an opening and closing element 301. A mounting frame 311 is fixed inside the second flow channel 310. The opening and closing element 301 is located outside the other end of the stirring blade 300. One end of the opening and closing element 301 is hinged to the mounting frame 311. A spring 302 is provided between the other end of the opening and closing element 301 and the mounting frame 311 so that the opening and closing element 301 can seal the outlet 320.

[0036] The opening / closing member 301 is rotatable between a first position and a second position. In the first position, the opening / closing member 301 opens the outlet 320, and in the second position, the opening / closing member 301 closes the outlet 320. When the opening / closing member 301 deviates from the second position, the spring 302 applies a biasing force to the opening / closing member 301 to close the outlet 320; When the stirring rod 100 rotates and the centrifugal force on the opening and closing member 301 is greater than the bias force, the opening and closing member 301 rotates from the second position to the first position.

[0037] The opening and closing element 301 adopts the above-described structure, so that the degree of opening and closing of the outlet 320 is controlled by the rotational speed of the stirring rod 100.

[0038] When the stirring rod 100 rotates at a low speed, the centrifugal force is small but greater than the bias force, and the opening degree of the opening and closing part 301 can be opened to a small degree, resulting in a relatively small output, which is suitable for working conditions that require fine stirring. When the stirring rod 100 increases its rotation speed, the centrifugal force increases, and the opening degree of the opening and closing part 301 increases accordingly, resulting in an increased output, which is suitable for working conditions that require rapid stirring and mixing.

[0039] It is conceivable that the export 320 could also use a one-way valve, which automatically adjusts the opening size of the valve port according to the rotation speed of the stirring rod 100.

[0040] Furthermore, such as Figure 5 As shown, there are multiple opening and closing elements 301, which are arranged sequentially along the circumferential direction of the stirring blade 300 (along the side wall of the stirring blade 300), so that the outlet 320 is divided into multiple discharge ports.

[0041] Specifically, the opening and closing element 301 can be eight or more.

[0042] Furthermore, such as Figure 2 ,3 As shown, the first flow channel 110 includes a contraction section 130 and an expansion section 140, with the upper end of the expansion section 140 connected to the lower end of the contraction section 130. The stirring device also includes a mixing structure 200, which is disposed on the stirring rod 100 and located below the expansion section 140. The mixing structure 200 includes a stirring element 210 rotatably disposed in the first flow channel 110 and a driving structure for driving the stirring element 210 to rotate.

[0043] like Figure 2 As shown, a contraction section 130, an expansion section 140, and a stirring element 210 are sequentially arranged in the vertical direction inside the stirring rod 100. When various liquids of different densities enter the stirring rod 100 from the inlet 120, the liquids of different densities can be mixed due to the gradual contraction of the aperture of the contraction section 130. The liquids of different densities can be slowed down due to the gradual expansion of the aperture of the expansion section 140 and the certain distance between the expansion section 140 and the mixing structure 200. Thus, the liquids of different densities can be further mixed in the first flow channel 110 between the expansion section 140 and the mixing structure 200. The stirring element 210 can be used to stir the liquids of different densities.

[0044] During operation, various liquid materials of different densities enter the first flow channel 110 from the inlet 120, then pass through the contraction section 130, the expansion section 140 and the agitator 210 in sequence, and then enter the second flow channel 310 of the agitator blade 300 from the lower end of the first flow channel 110, and finally exit from the outlet 320.

[0045] The agitator 210 can be selected to rotate in either the forward (clockwise) or reverse (counterclockwise) direction. When the liquid follows the agitator 100 due to its viscosity, the rotation direction of the agitator 100 can be set to the forward direction, and the rotation direction of the agitator 210 can be set to the reverse direction. Thus, the reverse-rotating agitator 210 can agitate the liquid that is rotating in the forward direction, so that liquids of different densities are fully mixed under the agitation action of the agitator 210.

[0046] Furthermore, such as Figure 3 , 4 As shown, The stirring element 210 is a permanent magnet, and the stirring element 210 includes a ring body 211 and a plurality of stirring elements 212 disposed on the inner wall of the ring body 211. The hybrid structure 200 also includes a receiving member 220, which is installed in the first flow channel 110. The receiving member 220 has a mounting cavity 221, and both the upper and lower ends of the mounting cavity 221 are connected to the first flow channel 110. The mounting cavity 221 has a support member 222, which can support the annular body 211 to rotate along the inner wall of the mounting cavity 221. The driving structure includes a coil 230, which is sleeved outside the stirring rod 100. The position of the coil 230 corresponds to the position of the accommodating member 220. When the coil 230 is energized, it can drive the stirring member 210 to rotate.

[0047] The stirring element 210 is driven to rotate by the coil 230, which simplifies the internal structure of the stirring rod 100.

[0048] During operation, the liquid enters the mounting cavity 221 from the top and exits from the bottom of the mounting cavity 221. When the coil 230 is energized, the coil 230 drives the ring body 211 to rotate, and the ring body 211 drives the stirring body 212 to rotate. The ring body 211 and the stirring body 212 together drive the liquid in the mounting cavity 221 to move.

[0049] It is understandable that the rotation axis of the annular body 211 is set vertically. Specifically, the rotation axis of the annular body 211 is the same as the rotation axis or extension direction of the stirring rod 100.

[0050] It is conceivable that, such as Figure 4 As shown, there can be one, two or more stirring bodies 212. When there are two or more stirring bodies 212, they are spaced apart along the circumference of the annular body 211.

[0051] It is conceivable that the mixing body 212 can be plate-shaped, thereby increasing the contact area between the mixing body 212 and the liquid, making it easier to mix the liquid. In the case that the contact area between the mixing body 212 and the liquid can be increased, the mixing body 212 can also adopt other shapes.

[0052] Specifically, the stirring rod 100 can be made of a non-magnetic material, such as stainless steel or other materials.

[0053] It is conceivable that the stirring element 210 may not necessarily use a permanent magnet, and the driving structure may not necessarily include a coil 230. Specifically, the driving structure includes a first motor and a connecting shaft. The stirring rod 100 is rotatably mounted on the reactor, with its upper end located outside the top of the reactor. A first gear is fitted around the stirring rod 100. A second motor is mounted on the reactor, located on one side of the stirring rod 100. The rotating shaft of the second motor is connected to a second gear that meshes with the first gear. The first motor is mounted on the reactor via a bracket and is located above the stirring rod 100. The rotating shaft of the first motor is connected to a connecting shaft, which extends into the stirring rod 100. The connecting shaft is partially fixedly connected to the inner wall of the annular body 211. During operation, the second motor drives the stirring rod 100 to rotate via the first and second gears, and the first motor drives the annular body 211 to rotate via the connecting shaft, thereby driving the stirring component 210 to rotate. It is understandable that, with the second motor, first gear, and second gear provided, the drive structure can also use other methods besides the motor to drive the annular body 211 to rotate, thereby driving the stirring component 210 to rotate.

[0054] Furthermore, such as Figure 3 As shown, the support member 222 is annular and installed on the inner wall of the mounting cavity 221. The support member 222 has an annular rotating cavity 2221. The annular body 211 is located inside the rotating cavity 2221. The support member 222 has a notch 2222 on the side near the middle of the stirring rod 100 that communicates with the rotating cavity 2221. The distance between the upper and lower sides of the notch 2222 is smaller than the distance between the upper and lower sides of the annular body 211. The stirring body 212 is located inside the notch 2222.

[0055] The support member 222 adopts the above structure, thereby enabling it to support the rotation of the annulus 211 and restrict the movement of the annulus 211.

[0056] During operation, the liquid enters the mounting cavity 221 from the top of the container 220, passes through the hollow part of the support 222, and is discharged from the bottom of the mounting cavity 221 outside the container 220; the coil 230 is energized, and the coil 230 drives the ring body 211 to rotate, and the ring body 211 rotates along the rotating cavity 2221.

[0057] Furthermore, such as Figure 3 As shown, the outer wall, the upper end and the lower end of the annulus 211 are all provided with sliding members 240.

[0058] Sliding elements 240 are provided on the outer wall, upper end, and lower end of the annular body 211 to reduce friction between the annular body 211 and other parts, thereby improving the service life of the stirring element 210. Sliding elements 240 are also provided on the upper and lower ends of the annular body 211 to restrict the up-and-down movement of the annular body 211.

[0059] Specifically, the slider 240 can be a ball or a roller.

[0060] Furthermore, such as Figure 3 As shown, the top of the accommodating member 220 has an upper opening 201, the diameter of which is greater than or equal to the diameter of the inner wall of the support member 222. The bottom of the accommodating member 220 has a plurality of second connecting holes 202, the upper and lower ends of which are connected to the mounting cavity 221 and the first flow channel 110 located below the accommodating member 220, respectively.

[0061] The diameter of the upper opening 201 is greater than or equal to the diameter of the inner wall of the support member 222, so that the liquid can more easily enter the hollow part of the support member 222; by providing the second connecting hole 202, the liquid in the mounting cavity 221 can only be discharged through multiple second connecting holes 202, thereby increasing the time that the liquid stays in the mounting cavity 221, so that the stirring member 210 can fully stir multiple liquids.

[0062] Understandably, the diameter of the second connecting hole 202 can be designed according to actual needs, provided that the liquid material can stay in the mounting cavity 221 for a certain period of time.

[0063] Furthermore, such as Figure 3 As shown, the mixing structure 200 also includes a sealing element 250, which is sleeved outside the coil 230 and connected to the stirring rod 100.

[0064] By providing a seal 250, the liquid outside the stirring rod 100 is prevented from contacting the coil 230.

[0065] Furthermore, such as Figure 2 As shown, the first flow channel 110 has a blocking block 150 located below the mixing structure 200. The blocking block 150 has a plurality of first connecting holes 151 extending in the vertical direction along the blocking block 150.

[0066] A blocking block 150 is provided below the mixing structure 200, so that the liquid is discharged only through the first connecting hole 151, increasing the residence time of the liquid and making the liquid fully mixed.

[0067] Furthermore, such as Figure 2 , 6As shown in Figure 7, one end of the stirring blade 300 is connected to the side wall of the lower end of the stirring rod 100. The bottom of the stirring rod 100 has a protrusion 160, and the protrusion 160 has a concave portion 170. The upper profile of the vertical cross section of the concave portion 170 is a concave arc shape, which makes the protrusion 160 bowl-shaped. This allows the liquid in the stirring rod 100 to first hit the concave portion 170 and then enter the second flow channel 310, thereby fully mixing the various liquids.

[0068] Specifically, a pressure sensor can be installed inside the stirring rod 100. When the pressure sensor detects an abnormal pressure, stirring can be stopped, and the opening / closing component 301 or the one-way valve can be disassembled for cleaning.

[0069] When this utility model is in operation: like Figure 2 , 3 As shown, during operation, the drive motor drives the stirring rod 100 to rotate. Various liquids of different densities enter the first flow channel 110 from the inlet 120, and pass through the contraction section 130 and the expansion section 140 in sequence. Then, they enter the mounting cavity 221 from the upper opening 201 of the container 220, then enter the hollow part of the support member 222, and then exit the container 220 from the second connecting hole 202. They then pass through the first connecting hole 151 of the blocking block 150 and continue to flow downward. After flowing downward for a certain distance, the liquid hits the recess 170, then enters the second flow channel 310, and then exits from the outlet 320 and enters the reactor. The coil 230 is energized, and the coil 230 drives the annular body 211 to rotate. The annular body 211 rotates along the rotating cavity 2221 of the support member 222. The annular body 211 and the stirring body 212 together drive the liquid in the mounting cavity 221 to move. The opening degree of the opening and closing member 301 is controlled according to the rotation speed of the stirring rod 100.

[0070] Although the technical solutions of this utility model have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these technical solutions without departing from the principles and spirit of this utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A hollow-feed mixing device, characterized in that, include: A stirring rod (100) has a first flow channel (110) extending in the vertical direction of the stirring rod (100), and the top of the stirring rod (100) has an inlet (120) communicating with the first flow channel (110). A stirring blade (300) has one end connected to the side wall of the stirring rod (100), and the stirring blade (300) has a second flow channel (310) communicating with the first flow channel (110). The other end of the stirring blade (300) has an outlet (320) communicating with the second flow channel (310).

2. The hollow feed mixing device according to claim 1, characterized in that: There are multiple stirring blades (300), and the multiple stirring blades (300) are spaced apart along the circumferential direction of the stirring rod (100).

3. The hollow feed mixing device according to claim 1 or 2, characterized in that: The vertical cross-section of the stirring blade (300) is in the shape of a ring racetrack.

4. The hollow feed mixing device according to claim 1, characterized in that: It also includes an opening and closing element (301), and a mounting bracket (311) is fixed inside the second flow channel (310). The opening and closing element (301) is located outside the other end of the stirring blade (300). One end of the opening and closing element (301) is hinged to the mounting bracket (311), and the other end of the opening and closing element (301) can be magnetically fixed to the other end of the stirring blade (300) so that the opening and closing element (301) can seal the outlet (320).

5. The hollow feed stirring device according to claim 1, characterized in that: It also includes an opening and closing element (301), and a mounting bracket (311) is fixed inside the second flow channel (310). The opening and closing element (301) is located outside the other end of the stirring blade (300). One end of the opening and closing element (301) is hinged to the mounting bracket (311), and a spring (302) is provided between the other end of the opening and closing element (301) and the mounting bracket (311) so that the opening and closing element (301) can seal the outlet (320).

6. The hollow feed stirring device according to claim 5, characterized in that: There are multiple opening and closing elements (301), and the multiple opening and closing elements (301) are arranged sequentially along the circumferential direction of the stirring blade (300).

7. The hollow feed stirring device according to claim 1, characterized in that: The first flow channel (110) includes a contraction section (130) and an expansion section (140), the upper end of the expansion section (140) being connected to the lower end of the contraction section (130); The stirring device further includes a mixing structure (200), which is disposed on the stirring rod (100) and located below the expansion section (140). The mixing structure (200) includes a stirring element (210) rotatably disposed in the first flow channel (110) and a driving structure for driving the stirring element (210) to rotate.

8. The hollow feed stirring device according to claim 7, characterized in that: The stirring component (210) includes an annular body (211) and a plurality of stirring bodies (212) disposed on the inner wall of the annular body (211). The hybrid structure (200) further includes a receiving element (220), which is installed in the first flow channel (110). The receiving element (220) has a mounting cavity (221), the upper and lower ends of which are connected to the first flow channel (110). The mounting cavity (221) has a support element (222), which can support the annulus (211) to rotate along the inner wall of the mounting cavity (221).

9. The hollow feed stirring device according to claim 7 or 8, characterized in that: The first flow channel (110) has a blocking block (150) located below the hybrid structure (200), and the blocking block (150) has a plurality of first connecting holes (151) extending in the vertical direction along the blocking block (150).

10. The hollow feed stirring device according to claim 1, characterized in that: One end of the stirring blade (300) is connected to the side wall of the lower end of the stirring rod (100). The bottom of the stirring rod (100) has a protrusion (160), and the protrusion (160) has a recessed part (170) that is recessed downwards. The upper profile of the vertical cross section of the recessed part (170) is a concave arc shape.

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