Miniature eyedrop manufacturing device

Abstract

The invention belongs to the technical field of eyedrop manufacturing, and discloses a miniature eyedrop manufacturing device which comprises a treatment bin and further comprises a transmission assembly movably mounted in the treatment bin; and the material injection assembly is fixedly arranged at the top of the treatment bin. A transmission hollow rod moves downwards, a solvent in a treatment bin enters the transmission hollow rod through an annular pipe and a connecting pipe, in the upward moving process of the transmission hollow rod, the volume between the transmission hollow rod and a storage bin is gradually reduced, and at the moment, the solvent in the transmission hollow rod pushes a third valve plate to move upwards; the solvent enters the storage bin through the through groove to be mixed with the eyedrop auxiliary materials, along with gradual increase of the internal pressure of the storage bin, the solvent pushes the second valve plate to move downwards to compress the spring, the solvent and the eyedrop auxiliary materials enter the corrugated pipe through the butt joint pipe and are sprayed out through the stirring pipe and the spray head, and the solvent and the auxiliary materials are fully mixed in a reciprocating mode.

Description

Technical Field

[0001] The invention belongs to the technical field of eye drops manufacturing, in particular to a micro eye drops manufacturing device. Background Art

[0002] Micro eye drops usually refer to eye drops designed with a micro dropper. The caliber of the micro dropper is very small, usually only 100 microns, which can greatly reduce the diameter of the droplets dripped, thereby controlling the amount of medicine dripped into the eye. The current steps of manufacturing micro dropper eye drops include dissolution, mixing, adjusting pH value, filtering and packaging; wherein the drug ingredients of micro dropper eye drops include solvents (such as water or saline) and excipients (such as buffers, stabilizers, solubilizers, etc.). At present, the solvent and excipients need to be fully mixed in the preparation process of micro dropper eye drops. In the existing micro dropper eye drops mixing preparation process, stirring blades are usually used to stir and mix the solvent and excipients, but the stirring blades have poor turbulence for the eye drops fluid, that is, the flow state of the fluid is not turbulent enough, and it is difficult to achieve effective mixing. The poor turbulence of the fluid will not only affect the stirring effect, but also may affect the transmission and mixing of the fluid, thereby affecting the efficiency and stability of the entire process. Therefore, a micro eye drops manufacturing device is proposed. Summary of the invention

[0003] In order to solve the problems raised in the above background technology, the present invention provides a micro eye drops manufacturing device, which solves the problem that the existing stirring blades have poor turbulence on the fluid, that is, the flow state of the fluid is not turbulent enough and it is difficult to achieve effective mixing.

[0004] To achieve the above object, the present invention provides the following technical solution: a micro eye drops manufacturing device, comprising a processing chamber, and further comprising: A transmission assembly, the transmission assembly being movably mounted inside the processing chamber; An injection assembly, the injection assembly is fixedly mounted on the top of the processing chamber, and the injection assembly is located inside the transmission assembly; A stirring assembly, wherein the stirring assembly is installed outside the transmission assembly; The transmission assembly comprises a transmission hollow rod movably mounted inside the processing chamber, a transmission wheel is fixedly mounted on the upper end of the transmission hollow rod, a motor for driving the transmission wheel and the transmission hollow rod to rotate is arranged on the top of the processing chamber, an annular tube is installed at the lower end of the transmission hollow rod through a connecting tube, and a water inlet hole is opened at the bottom of the annular tube; The upper end of the transmission hollow rod is provided with a vertical groove for the transmission wheel to slide; The injection assembly comprises an injection pipe fixedly mounted on the processing bin via a fixing frame, the transmission wheel is movably mounted on the fixing frame, a storage bin is fixedly mounted at the bottom of the injection pipe, and the storage bin is threadedly connected to the transmission hollow rod; The stirring assembly comprises a stirring tube fixedly mounted on the outside of a transmission hollow rod, a stirring plate fixedly mounted in the middle of the stirring tube, nozzles equidistantly arranged on the stirring tube, and the stirring tube is connected to a storage bin through a corrugated tube.

[0005] Preferably, the transmission assembly further comprises a first fixing ring fixed inside the transmission hollow rod, and the top of the first fixing ring is connected to a first valve plate through a first docking ring and a first rubber connector; The outer annular array of the first rubber connector is provided with water holes.

[0006] Preferably, a first floating plate is fixedly mounted on the top of the first valve plate, and the first floating plate is a hollow structure.

[0007] Preferably, the injection assembly further comprises a movable ring movably sleeved on the bottom of the storage bin, a slider is arranged on the outer annular array of the movable ring, and a groove for the slider to slide is formed on the inner wall of the transmission hollow rod.

[0008] Preferably, a guide tube is fixedly mounted on the inner wall of the injection tube, a limit plate is fixedly mounted inside the guide tube, a matching valve block is movably sleeved on the limit plate, a connecting rod is sleeved in the middle of the valve block, and a valve plug is fixedly mounted on the bottom of the connecting rod.

[0009] Preferably, the outer diameter of the lower end of the inner wall of the guide tube gradually decreases from top to bottom, and the valve plug is in a truncated cone shape and contacts the inner wall of the guide tube to seal the guide tube.

[0010] Preferably, the top of the injection pipe is in a flared state, and the bottoms of the injection pipe and the guide pipe are connected to the storage bin; The connecting rod is lifted up, the valve block is separated from the middle part of the limit plate, the connecting rod and the valve block are rotated 90 degrees, and the middle part of the limit plate is in an open state.

[0011] Preferably, the injection assembly also includes a second docking ring fixed to the middle of the storage bin, the second docking ring is connected to the third valve plate through a second rubber connector, the outer annular array of the second rubber connector is provided with a through groove, and a second floating plate is fixed on the top of the third valve plate.

[0012] Preferably, a butt joint is fixedly mounted at the bottom of the movable ring, a second fixed ring and a cross support frame are respectively fixedly mounted at the upper and lower ends of the butt joint, a guide rod for guiding the second valve plate is arranged between the second fixed ring and the cross support frame, a spring is arranged at the top of the cross support frame, and a second valve plate for sealing the second fixed ring is arranged at the top of the spring; One end of the corrugated pipe is connected to the bottom of the butt-joint pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention allows the transmission hollow rod to move downward, and the solvent in the processing bin enters the interior of the transmission hollow rod through the annular tube and the connecting tube. During the upward movement of the transmission hollow rod, the volume between the transmission hollow rod and the storage bin gradually decreases. At this time, the solvent in the transmission hollow rod pushes the third valve plate upward, enters the interior of the storage bin through the through groove and mixes with the eye drops auxiliary material. As the pressure inside the storage bin gradually increases, the solvent pushes the second valve plate downward to compress the spring, so that the solvent and the eye drops auxiliary material enter the interior of the corrugated tube through the docking tube, and are sprayed out through the stirring tube and the nozzle, thereby reciprocating to achieve full mixing of the solvent and the auxiliary material. The present invention lifts up the connecting rod, the valve block and the valve plug, the valve block is separated from the middle part of the limit plate, the connecting rod and the valve block are rotated ninety degrees, the middle part of the limit plate is in an open state, and the valve plug is separated from the contact with the inner wall of the guide tube, so that the eye drops auxiliary materials can be injected into the internal storage bin through the top of the injection tube, so that the eye drops auxiliary materials are evenly mixed with the solvent. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the internal structure of the present invention; Figure 2 This is a schematic diagram of the appearance structure of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of the transmission assembly, injection assembly and stirring assembly of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 This is a schematic diagram of the cross-sectional structure of the injection assembly of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram at C in the middle; Figure 7 This is a schematic diagram of the disassembled structure of the injection assembly of the present invention; Figure 8 For the present invention Figure 7 The enlarged structural diagram at B in the middle; Fig. 9 It is a schematic diagram of the disassembled structure of the valve block and the limit plate of the present invention.

[0015] In the figure: 1, processing bin; 2, transmission assembly; 21, transmission hollow rod; 22, transmission wheel; 23, connecting pipe; 24, annular pipe; 25, first fixing ring; 26, first rubber connector; 27, first docking ring; 28, first valve plate; 29, first floating plate; 3, injection assembly; 31, injection pipe; 32, guide pipe; 33, limit plate; 34, connecting rod; 35, valve block; 36, valve plug; 37, storage bin; 3 11. movable ring; 312. slider; 313. docking tube; 314. second fixed ring; 315. guide rod; 316. cross support frame; 317. spring; 318. second valve plate; 321. second docking ring; 322. second rubber connector; 323. second floating plate; 324. third valve plate; 325. through groove; 4. stirring assembly; 41. stirring tube; 42. stirring plate; 43. nozzle; 44. bellows. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figures 1 to 9 As shown, the present invention provides a micro eye drops manufacturing device, including a processing chamber 1, and also includes: A transmission assembly 2, the transmission assembly 2 is movably installed inside the processing chamber 1; The injection assembly 3 is fixed on the top of the processing chamber 1 and is located inside the transmission assembly 2; A stirring assembly 4, wherein the stirring assembly 4 is installed outside the transmission assembly 2; The transmission assembly 2 includes a transmission hollow rod 21 movably mounted inside the processing chamber 1, a transmission wheel 22 is fixedly mounted on the upper end of the transmission hollow rod 21, a motor for driving the transmission wheel 22 and the transmission hollow rod 21 to rotate is arranged on the top of the processing chamber 1, and an annular tube 24 is installed at the lower end of the transmission hollow rod 21 through a connecting tube 23, and a water inlet hole is opened at the bottom of the annular tube 24; The upper end of the transmission hollow rod 21 is provided with a vertical groove for the transmission wheel 22 to slide; The injection assembly 3 includes an injection pipe 31 fixed to the processing bin 1 through a fixing frame, the transmission wheel 22 is movably mounted on the fixing frame, and a storage bin 37 is fixed to the bottom of the injection pipe 31, and the storage bin 37 is threadedly connected to the transmission hollow rod 21; The stirring assembly 4 includes a stirring tube 41 fixed to the outside of the transmission hollow rod 21 , a stirring plate 42 is fixed in the middle of the stirring tube 41 , nozzles 43 are equidistantly arranged on the stirring tube 41 , and the stirring tube 41 is connected to the storage bin 37 through a bellows 44 .

[0018] The solvent is injected into the processing bin 1, and the auxiliary material is injected into the inside of the injection assembly 3. The motor drives the transmission wheel 22 and the transmission hollow rod 21 to rotate through the belt. During the rotation process, since the storage bin 37 is threadedly connected with the transmission hollow rod 21, and the injection pipe 31 is fixedly installed with the processing bin 1 through the fixing frame, the transmission hollow rod 21 cooperates with the storage bin 37, so that the transmission hollow rod 21 moves downward in the processing bin 1, and the lower end of the transmission hollow rod 21 is in a negative pressure state. At this time, the solvent in the processing bin 1 enters the connecting pipe 23 and the transmission hollow rod 21 through the water inlet hole at the bottom of the annular pipe 24. , at this time, the motor drives the transmission wheel 22 and the transmission hollow rod 21 to rotate in the opposite direction, and the transmission hollow rod 21 cooperates with the storage bin 37 to move the transmission hollow rod 21 up in the processing bin 1, thereby pushing the solvent inside the transmission hollow rod 21 into the storage bin 37 through the storage bin 37, and enters the stirring pipe 41 through the bellows 44 and is sprayed out from the nozzle 43 to form a water curtain. During the rotation of the transmission hollow rod 21, the stirring pipe 41 and the stirring plate 42 are driven to rotate, thereby stirring the solvent in the processing bin 1, and cooperating with the solvent sprayed from the nozzle 43 to fully mix the solvent and the auxiliary material.

[0019] like Figure 4 As shown, the transmission assembly 2 further includes a first fixing ring 25 fixed inside the transmission hollow rod 21, and the top of the first fixing ring 25 is connected to a first valve plate 28 through a first docking ring 27 and a first rubber connector 26; The outer annular array of the first rubber connector 26 is provided with water holes; A first floating plate 29 is fixedly mounted on the top of the first valve plate 28 , and the first floating plate 29 is a hollow structure.

[0020] During the downward movement of the transmission hollow rod 21 in the processing chamber 1, the solvent in the processing chamber 1 enters the annular tube 24 and the connecting tube 23, and the solvent pushes the first valve plate 28 to separate the first rubber connector 26 from the first fixing ring 25, so that the solvent can enter the interior of the transmission hollow rod 21 through the water hole. During the upward movement of the transmission hollow rod 21, the volume of the lower end gradually decreases, and the solvent inside pushes the first valve plate 28 downward to contact the first fixing ring 25 for sealing. At this time, the solvent inside the transmission hollow rod 21 can only enter the interior of the stirring tube 41 through the storage bin 37 and the bellows 44, and be discharged through the nozzle 43.

[0021] like Figure 3 and Figure 7As shown, the injection assembly 3 also includes a movable ring 311 movably mounted on the bottom of the storage bin 37 , a slider 312 is arranged in an outer annular array of the movable ring 311 , and a groove for the slider 312 to slide is provided on the inner wall of the transmission hollow rod 21 .

[0022] When the stirring tube 41 is driven to rotate by the transmission hollow rod 21, the slider 312 slides in the groove on the inner wall of the transmission hollow rod 21, so that the slider 312, the movable ring 311 and the bellows 44 rotate synchronously with the transmission hollow rod 21, thereby ensuring that the solvent can increase circulation and mixing.

[0023] like Figure 5 , Figure 7 and Fig. 9 As shown, a guide tube 32 is fixedly mounted on the inner wall of the injection tube 31, a limit plate 33 is fixedly mounted inside the guide tube 32, a matching valve block 35 is movably sleeved on the limit plate 33, a connecting rod 34 is sleeved in the middle of the valve block 35, and a valve plug 36 is fixedly mounted on the bottom of the connecting rod 34; The outer diameter of the lower end of the inner wall of the guide tube 32 gradually decreases from top to bottom, and the valve plug 36 is truncated cone-shaped and contacts the inner wall of the guide tube 32 to block the guide tube 32; The top of the injection pipe 31 is in a flared state, and the bottoms of the injection pipe 31 and the guide pipe 32 are connected to the storage bin 37; The connecting rod 34 is lifted up, and the valve block 35 is separated from the middle part of the limiting plate 33. The connecting rod 34 and the valve block 35 are rotated 90 degrees, and the middle part of the limiting plate 33 is in an open state.

[0024] By lifting the connecting rod 34, the valve block 35 and the valve plug 36, the valve block 35 is separated from the middle part of the limit plate 33, the connecting rod 34 and the valve block 35 are rotated ninety degrees, the middle part of the limit plate 33 is in an open state, and the valve plug 36 is separated from the contact with the inner wall of the guide tube 32, the eye drops auxiliary material can be injected into the internal storage bin 37 through the top of the injection tube 31 for storage.

[0025] like Figure 5-Figure 8 As shown, the injection assembly 3 also includes a second docking ring 321 fixed to the middle of the storage bin 37, the second docking ring 321 is connected to the third valve plate 324 through a second rubber connector 322, the outer annular array of the second rubber connector 322 is provided with a through groove 325, and the top of the third valve plate 324 is fixed with a second floating plate 323; A butt joint pipe 313 is fixedly mounted at the bottom of the movable ring 311, and a second fixed ring 314 and a cross support frame 316 are fixedly mounted at the upper and lower ends of the butt joint pipe 313, respectively. A guide rod 315 for guiding the second valve plate 318 is arranged between the second fixed ring 314 and the cross support frame 316, and a spring 317 is arranged at the top of the cross support frame 316, and a second valve plate 318 for blocking the second fixed ring 314 is arranged at the top of the spring 317; One end of the bellows 44 is connected to the bottom of the butt joint 313 .

[0026] When the transmission hollow rod 21 moves downward, the solvent inside the processing chamber 1 enters the interior of the transmission hollow rod 21 through the annular tube 24 and the connecting tube 23. During the upward movement of the transmission hollow rod 21, the volume between the transmission hollow rod 21 and the storage bin 37 gradually decreases. At this time, the solvent inside the transmission hollow rod 21 pushes the third valve plate 324 to move upward, enters the interior of the storage bin 37 through the through groove 325 and mixes with the eye drops auxiliary materials. As the internal pressure of the storage bin 37 gradually increases, the solvent pushes the second valve plate 318 to move downward and compresses the spring 317, so that the solvent and the eye drops auxiliary materials enter the interior of the bellows 44 through the docking tube 313, and are sprayed out through the stirring tube 41 and the nozzle 43, so as to realize the full mixing of the solvent and the auxiliary materials by reciprocating.

[0027] The working principle and use process of the present invention: By lifting the connecting rod 34, the valve block 35 and the valve plug 36, the valve block 35 is separated from the middle of the limit plate 33, the connecting rod 34 and the valve block 35 are rotated 90 degrees, the middle of the limit plate 33 is in an open state, and the valve plug 36 is separated from the inner wall of the guide tube 32, so that the eye drops auxiliary material can be injected into the storage bin 37 through the top of the injection tube 31 for storage; The solvent is injected into the processing bin 1, and the auxiliary material is injected into the inside of the injection assembly 3. The motor drives the transmission wheel 22 and the transmission hollow rod 21 to rotate through the belt. During the rotation process, since the storage bin 37 is threadedly connected with the transmission hollow rod 21, and the injection pipe 31 is fixedly installed with the processing bin 1 through the fixing frame, the transmission hollow rod 21 cooperates with the storage bin 37, so that the transmission hollow rod 21 moves downward in the processing bin 1, and the lower end of the transmission hollow rod 21 is in a negative pressure state. At this time, the solvent in the processing bin 1 enters the connecting pipe 23 and the transmission hollow rod 21 through the water inlet hole at the bottom of the annular pipe 24. At this time, the motor drives the transmission wheel 22 and the transmission hollow rod 21 to rotate in the opposite direction, and the transmission hollow rod 21 cooperates with the storage bin 37 to move the transmission hollow rod 21 upward in the processing bin 1, thereby pushing the solvent inside the transmission hollow rod 21 into the storage bin 37 through the storage bin 37, and entering the stirring pipe 41 through the bellows 44 to be sprayed out from the nozzle 43 to form a water curtain, and the rotation of the transmission hollow rod 21 drives the stirring pipe 41 and the stirring plate 42 to rotate, stirring the solvent in the processing bin 1, and cooperating with the solvent sprayed from the nozzle 43 to fully mix the solvent with the auxiliary material; When the transmission hollow rod 21 moves downward, the solvent inside the processing chamber 1 enters the interior of the transmission hollow rod 21 through the annular tube 24 and the connecting tube 23. During the upward movement of the transmission hollow rod 21, the volume between the transmission hollow rod 21 and the storage bin 37 gradually decreases. At this time, the solvent inside the transmission hollow rod 21 pushes the third valve plate 324 to move upward, enters the interior of the storage bin 37 through the through groove 325 and mixes with the eye drops auxiliary materials. As the internal pressure of the storage bin 37 gradually increases, the solvent pushes the second valve plate 318 to move downward and compresses the spring 317, so that the solvent and the eye drops auxiliary materials enter the interior of the bellows 44 through the docking tube 313, and are sprayed out through the stirring tube 41 and the nozzle 43, so as to realize the full mixing of the solvent and the auxiliary materials by reciprocating.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A micro eye drops manufacturing device, comprising a processing chamber (1), characterized in that: Also includes: A transmission assembly (2), the transmission assembly (2) being movably mounted inside the processing chamber (1); An injection assembly (3), the injection assembly (3) being fixedly mounted on the top of the processing chamber (1), and the injection assembly (3) being located inside the transmission assembly (2); A stirring assembly (4), wherein the stirring assembly (4) is mounted outside the transmission assembly (2); The transmission assembly (2) comprises a transmission hollow rod (21) movably mounted inside the processing chamber (1); a transmission wheel (22) is fixedly mounted on the upper end of the transmission hollow rod (21); a motor for driving the transmission wheel (22) and the transmission hollow rod (21) to rotate is arranged on the top of the processing chamber (1); an annular tube (24) is mounted on the lower end of the transmission hollow rod (21) via a connecting tube (23); a water inlet hole is provided at the bottom of the annular tube (24); The upper end of the transmission hollow rod (21) is provided with a vertical groove for the transmission wheel (22) to slide; The injection assembly (3) comprises an injection pipe (31) fixedly mounted on the processing bin (1) via a fixing frame, the transmission wheel (22) being movably mounted on the fixing frame, a storage bin (37) being fixedly mounted at the bottom of the injection pipe (31), and the storage bin (37) being threadedly connected to the transmission hollow rod (21); The stirring assembly (4) comprises a stirring tube (41) fixedly mounted on the outside of the transmission hollow rod (21), a stirring plate (42) fixedly mounted in the middle of the stirring tube (41), nozzles (43) being arranged at equal intervals on the stirring tube (41), and the stirring tube (41) being connected to the material storage bin (37) via a bellows (44).

2. The micro eye drops manufacturing device according to claim 1, characterized in that: The transmission assembly (2) further comprises a first fixing ring (25) fixedly mounted inside the transmission hollow rod (21), wherein the top of the first fixing ring (25) is connected to a first valve plate (28) via a first docking ring (27) and a first rubber connector (26); The first rubber connecting member (26) is provided with water holes in an annular array on its exterior.

3. The micro eye drops manufacturing device according to claim 2, characterized in that: A first floating plate (29) is fixedly mounted on the top of the first valve plate (28), and the first floating plate (29) is a hollow structure.

4. The micro eye drops manufacturing device according to claim 1, characterized in that: The injection assembly (3) further comprises a movable ring (311) movably sleeved on the bottom of the material storage bin (37), a sliding block (312) being provided in an annular array outside the movable ring (311), and a groove for the sliding block (312) to slide on the inner wall of the transmission hollow rod (21).

5. The micro eye drops manufacturing device according to claim 4, characterized in that: A guide tube (32) is fixedly mounted on the inner wall of the injection tube (31), a limit plate (33) is fixedly mounted inside the guide tube (32), a matching valve block (35) is movably sleeved on the limit plate (33), a connecting rod (34) is sleeved on the middle of the valve block (35), and a valve plug (36) is fixedly mounted on the bottom of the connecting rod (34).

6. The micro eye drops manufacturing device according to claim 5, characterized in that: The outer diameter of the lower end of the inner wall of the guide tube (32) gradually decreases from top to bottom, and the valve plug (36) is in a truncated cone shape and contacts the inner wall of the guide tube (32) to block the guide tube (32).

7. The micro eye drops manufacturing device according to claim 6, characterized in that: The top of the injection pipe (31) is in a flared state, and the bottoms of the injection pipe (31) and the guide pipe (32) are in communication with the storage bin (37); The connecting rod (34) is lifted up, and the valve block (35) is separated from the middle part of the limiting plate (33). The connecting rod (34) and the valve block (35) are rotated ninety degrees, and the middle part of the limiting plate (33) is in an open state.

8. The micro eye drops manufacturing device according to claim 7, characterized in that: The injection assembly (3) further comprises a second docking ring (321) fixed to the middle of the storage bin (37); the second docking ring (321) is connected to a third valve plate (324) via a second rubber connector (322); a through groove (325) is formed in an outer annular array of the second rubber connector (322); and a second floating plate (323) is fixedly mounted on the top of the third valve plate (324).

9. The micro eye drops manufacturing device according to claim 8, characterized in that: A butt joint tube (313) is fixedly mounted at the bottom of the movable ring (311), and a second fixed ring (314) and a cross support frame (316) are respectively fixedly mounted at the upper and lower ends of the butt joint tube (313), a guide rod (315) for guiding the second valve plate (318) is arranged between the second fixed ring (314) and the cross support frame (316), a spring (317) is arranged at the top of the cross support frame (316), and a second valve plate (318) for blocking the second fixed ring (314) is arranged at the top of the spring (317); One end of the bellows (44) is connected to the bottom of the butt joint (313).

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