Anti-impact gynecological inflammation dosing device with slow flow mechanism

Abstract

The invention discloses an anti-impact gynecological inflammation dosing device with a flow slowing mechanism, and belongs to the technical field of gynecological nursing dosing devices.The anti-impact gynecological inflammation dosing device comprises a medicine injection cylinder containing medicine, a grip is fixedly installed at the left end of the medicine injection cylinder, a sealing rubber plug is arranged on the inner side of the medicine injection cylinder, and a pull rod is fixedly connected to the left side of the sealing rubber plug; meanwhile, a push seat is fixedly mounted at the left end of the pull rod, a conveying pipe is connected to the right end of the medicine injection cylinder, and a medicine applying spray head is fixedly connected to the right end of the conveying pipe; a medicine hole is formed in the medicine applying spray head, a flow slowing assembly used for slowing down the flow speed of medicine is arranged on the inner side of the medicine applying spray head, a sealing butt joint film is fixedly connected to the right end of the medicine applying spray head, and a movable locking disc is rotationally installed at the left end of the grip. According to the anti-impact gynecological inflammation dosing device with the slow flow mechanism, the drug pushing speed can be limited, multi-mode slow flow is achieved, it is avoided that the drug impacts the inflammation position at a high speed, and the discomfort of drug applying is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gynecological care medication applicators, in particular to an anti-impact gynecological inflammation medication applicator provided with a slow-flow mechanism. Background Art

[0002] For common gynecological diseases such as vaginitis and cervicitis, oral medication is not effective, so direct vaginal administration is generally used. The drug is usually introduced into the inflamed area of ​​the vagina or directly contacted for anti-inflammatory treatment, so a drug delivery device is needed.

[0003] The prior art (application number: 202122741713.1, Chinese patent with application date of 2021-11-10) discloses a drug delivery device for gynecological care, including a mounting plate, a first tube body is fixedly connected to the top of the mounting plate, a medicine feed tube is fixedly connected to the right side of the first tube body, a push rod is slidably connected to the right side of the medicine feed tube, a sealing plate is fixedly connected to the left side of the push rod, the surface of the sealing plate is slidably connected to the inner wall of the medicine feed tube, a second tube body is slidably connected to the surface of the first tube body, an elastic plate is fixedly connected between the inner wall of the second tube body and the outer wall of the first tube body, and a medicine delivery tube is fixedly connected to the left side of the second tube body. Through the cooperation of the above-mentioned structures, it is convenient for the staff to adjust the length of the applicator, and the stability of the applicator after the adjustment is completed is guaranteed, the situation where the applicator sprays medicine too violently is reduced, the comfort of the patient during care is improved, and the work of the staff is convenient; the prior art (application number: 202222441600.4, Chinese patent with application date of 2022-09-15) discloses a vaginal applicator for gynecologists, which belongs to the technical field of vaginal applicators, including a rubber sleeve, a threaded sleeve is connected to the center of one side of the inner periphery of the rubber sleeve, and a movable center rod is arranged at the center of the rubber sleeve, the end of the center rod away from the rubber sleeve is connected to a turntable, and the outer periphery of the center rod is rotatably connected to multiple bearings, and a rubber support ring is connected between the outer ring of the bearing and the inner periphery of the rubber sleeve, and a plurality of medicine storages for storing medicine are connected to the side of the rubber sleeve away from the turntable. The medicine storage cylinder is a medicine storage cylinder having an inner circumference provided with an adaptive push plate, an outer circumference of the push plate is provided with a rubber layer, and a push rod for pushing medicine is provided on one side of the push plate. The use of soft materials and a design with buffering compression improves the comfort while avoiding the occurrence of scratches on the patient's internal organs caused by hard materials; the prior art (application number: 202322243272.1, Chinese patent with application date of 2023-08-21) discloses a gynecological drug delivery device, including a shell, a protrusion is provided at the open end of the shell, a front ear is provided on the protrusion, an inner shell head and an outer shell head are provided at the end of the shell away from the front ear, a buffer space is formed between the inner shell head and the outer shell head, a main hole is provided on the inner shell head, and a plurality of auxiliary holes are provided on the outer shell head, a pullable piston rod is provided in the shell, and a detachable piston head is installed at the end of the piston rod located in the shell. The device has the following advantages: reasonable structural design, easy to hold and operate, can smoothly deliver the drug deep into the vagina, is easy to observe the drug dosage, and is stable and reliable in use.

[0004] However, the existing drug delivery device has a single method for regulating the flow rate of the drug during use, and only uses a single buffer structure to block and slow down the flow rate of the drug solution. However, when the drug pushing speed is large enough, it will still generate a large impact force, resulting in discomfort when using the drug at the inflamed site, and there are certain usage defects. Summary of the invention

[0005] The purpose of the present invention is to provide an impact-proof gynecological inflammation drug delivery device equipped with a flow-slowing mechanism, so as to solve the problem raised in the above-mentioned background technology that the gynecological inflammation drug delivery device currently on the market only uses a single buffer structure to block and slow down the flow rate of the medicine liquid, but when the medicine pushing speed is large enough, it will still generate a large impact force, thereby causing discomfort in the use of medicine at the inflammation site.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-shock type gynecological inflammation drug delivery device with a slow flow mechanism, comprising a drug injection barrel filled with medicine, a handle fixedly installed at the left end of the drug injection barrel, a sealing rubber plug provided on the inner side of the drug injection barrel, a pull rod fixedly connected to the left side of the sealing rubber plug, and a push seat fixedly installed at the left end of the pull rod, a delivery pipe connected to the right end of the delivery pipe, and a drug application nozzle fixedly connected to the right end of the delivery pipe; A medicine hole is provided on the medicine applying nozzle, and a slow flow component for slowing down the flow rate of the medicine is arranged on the inner side of the medicine applying nozzle, and a sealing docking film is fixedly connected to the right end of the medicine applying nozzle, a movable locking disk is rotatably installed on the left end of the handle, and a fixing ring is also fixedly installed on the left end of the handle, and a limit component for limiting the advancement speed of the sealing rubber plug is connected between the movable locking disk and the fixing ring.

[0007] Preferably, the pull rod passes through the handle and is slidably connected thereto, and the sealing rubber plug connected to the right end of the pull rod is in interference sliding connection with the inner wall of the drug injection barrel.

[0008] Preferably, the flow slowing component includes a buffer flow reducer seat arranged on the inner side of the medicine applying nozzle, and the buffer flow reducer seat and the conveying pipe are coaxially arranged, and the buffer flow reducer seat and the medicine applying nozzle are elastically connected by an elastic telescopic mechanism, and the buffer flow reducer seat moves elastically under the impact of the medicine in the conveying pipe.

[0009] Preferably, the elastic telescopic mechanism includes a fixed plate fixedly installed on the left side of the buffer flow reducer seat, and a guide column is slidably arranged on the fixed plate, and the guide column is fixedly connected to the left end inner wall of the medicine applying nozzle, and a spring is fixedly connected between the fixed plate and the left end inner wall of the medicine applying nozzle.

[0010] Preferably, an elastic air storage bag is sleeved on the outer side of the guide column, and the two ends of the elastic air storage bag are respectively fixedly connected to the fixed plate and the right end of the guide column, and the outer side of one end of the delivery tube close to the medicine application nozzle is fixedly connected with an elastic support bag, and at the same time, the elastic support bag and the elastic air storage bag are fixedly connected through an air guide tube, and when the elastic air storage bag is pressurized, gas is delivered into the elastic support bag to cause the elastic support bag to expand.

[0011] Preferably, the right end of the medicine applying nozzle is evenly and fixedly connected with a sealing butt film, and adjacent sealing butt films are fitted and sealed to each other.

[0012] Preferably, the right side of the buffer flow reducer seat is fixedly connected with a magnetic block through a frame, and a magnetic sheet is pasted on the inner wall of the sealing butt film, and when the buffer flow reducer seat is impacted and moved, it drives the magnetic block to approach the magnetic sheet on the inner side of the sealing butt film, and at the same time, the magnetic poles of the opposite surfaces of the magnetic sheet and the magnetic block are the same, and the sealing butt film will undergo elastic deformation under the action of magnetic force to expand the gap between adjacent sealing butt films.

[0013] Preferably, the pull rod passes through the movable locking plate, and a spiral guide groove is provided on the outer wall of the pull rod, and a ball is embedded and installed on the inner wall of the movable locking plate, and the ball rolls along the guide groove.

[0014] Preferably, the limit assembly includes accommodating grooves evenly arranged on the outer wall of the movable locking disk, and the inner side of the accommodating grooves is elastically rotatably connected with positioning teeth, and the inner wall of the fixed ring is evenly provided with limit grooves, the movable locking disk and the fixed ring are coaxially arranged, and the positioning teeth are elastically rotated to engage with the limit grooves.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the impact-proof gynecological inflammation drug delivery device with a slow flow mechanism can limit the speed of drug pushing, realize multi-mode slow flow, avoid high-speed impact of drugs on the inflammation site, and reduce the discomfort of drug application. The specific contents are as follows; 1. A medicine application nozzle and a sealing butt film are provided. The sealing butt film is made of elastic material, so that the sealing butt film can be deformed and buffered when it contacts the inflamed part of the patient, thereby reducing the damage to the inflamed part caused by the medicine application nozzle when entering.

[0016] 2. A buffer flow reducer seat, an elastic support sac and a sealing butt film are provided. When the delivery pipe delivers the medicine to the medicine applying nozzle, the buffer flow reducer seat can block the medicine. At this time, the buffer flow reducer seat will slide elastically on the inner side of the medicine applying nozzle to achieve effective buffering and deceleration of the medicine, and achieve a preliminary slow flow effect on the medicine to reduce the subsequent impact on the medicine applying place. When the impact force of the medicine is too large, the buffer flow reducer seat will squeeze the elastic air storage sac during movement, so that part of the gas in the elastic air storage sac enters the elastic support sac, so that the elastic support sac expands and supports the outer side of the medicine applying place to increase the distance between the medicine hole and the medicine applying place, thereby reducing the impact. At the same time, the buffer flow reducer seat will drive the magnetic block to approach the magnetic sheet, so that the sealing butt film will undergo elastic deformation, thereby expanding the diameter of the medicine outlet hole and further reducing the flow rate of the medicine.

[0017] 3. A movable locking plate and a fixed ring are provided. When the pull rod is pushed too fast during the drug application process, the ball will roll along the guide groove, thereby driving the movable locking plate to rotate rapidly, so that the positioning tooth pops out of the accommodating groove under the action of centrifugal force, and then automatically engages in the limiting groove of the fixed ring, making the pull rod unable to be pushed, thereby limiting the pushing speed of the pull rod and further achieving the purpose of controlling the flow rate of the drug solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a side view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the disassembled structure of the pull rod, the movable locking plate and the fixing ring of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle; Figure 6 It is a schematic diagram of the installation structure of the movable locking plate and the fixing ring of the present invention; Figure 7 This is a schematic diagram of the installation structure of the sealing butt joint film of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the medicine spray nozzle of the present invention; Fig. 9 It is a schematic diagram of the connection structure between the elastic air storage bag body and the elastic support bag body of the present invention; Fig.10 For the present invention Figure 8 Enlarged structural diagram at B in the middle.

[0019] In the figure: 1. injection cartridge; 2. grip; 3. sealing rubber plug; 4. pull rod; 401. guide groove; 5. push seat; 6. delivery pipe; 7. medicine application nozzle; 8. medicine hole; 9. buffer flow reduction seat; 10. fixed plate; 11. guide column; 12. spring; 13. elastic air storage bag; 14. elastic support bag; 15. air guide tube; 16. sealing docking film; 17. magnetic sheet; 18. magnetic block; 19. movable locking plate; 1901. ball; 1902. receiving groove; 1903. positioning tooth; 20. fixing ring; 2001. limit groove. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1: Please refer to Figure 1-Figure 3 and Figure 7-10 As shown, the existing gynecological inflammation drug delivery device has a single buffering method, which makes it impossible for the drug to fully slow down, resulting in the inflammation site being easily impacted and causing discomfort. In order to solve this technical problem, this embodiment discloses the following technical content; A shock-proof gynecological inflammation drug delivery device with a slow-flow mechanism comprises a drug injection barrel 1 filled with medicine, a handle 2 is fixedly installed on the left end of the drug injection barrel 1, and a sealing rubber plug 3 is arranged on the inner side of the drug injection barrel 1, and a pull rod 4 is fixedly connected to the left side of the sealing rubber plug 3, and a push seat 5 is fixedly installed on the left end of the pull rod 4, the right end of the drug injection barrel 1 is connected to a delivery pipe 6, and the right end of the delivery pipe 6 is fixedly connected to a drug application nozzle 7; a drug hole 8 is opened on the drug application nozzle 7, and a slow-flow component for slowing down the flow rate of the medicine is arranged on the inner side of the drug application nozzle 7, and a sealing docking film 16 is fixedly connected to the right end of the drug application nozzle 7.

[0022] The pull rod 4 passes through the handle 2 and is slidably connected thereto, and the sealing rubber plug 3 connected to the right end of the pull rod 4 is slidably connected to the inner wall of the medicine injection barrel 1 by interference fit. The slow flow assembly includes a buffer flow reducer seat 9 arranged on the inner side of the medicine applying nozzle 7, and the buffer flow reducer seat 9 and the conveying pipe 6 are coaxially arranged, and the buffer flow reducer seat 9 and the medicine applying nozzle 7 are elastically connected through an elastic telescopic mechanism, and at the same time, the buffer flow reducer seat 9 elastically moves under the impact of the medicine in the conveying pipe 6, and the elastic telescopic mechanism includes a fixed plate 10 fixedly installed on the left side of the buffer flow reducer seat 9, and a guide column 11 is slidably arranged on the fixed plate 10, and the guide column 11 is fixedly connected to the inner wall of the left end of the medicine applying nozzle 7, and at the same time, a spring 12 is fixedly connected between the fixed plate 10 and the inner wall of the left end of the medicine applying nozzle 7.

[0023] An elastic air storage bag 13 is sleeved on the outer side of the guide column 11, and the two ends of the elastic air storage bag 13 are fixedly connected to the fixed plate 10 and the right end of the guide column 11 respectively, and an elastic support bag 14 is fixedly connected to the outer side of one end of the delivery tube 6 close to the medicine application nozzle 7. At the same time, the elastic support bag 14 and the elastic air storage bag 13 are fixedly connected through an air guide tube 15. After the elastic air storage bag 13 is pressurized, gas is delivered into the elastic support bag 14 to cause the elastic support bag 14 to expand.

[0024] The right end of the medicine applying nozzle 7 is evenly fixedly connected with a sealing butt film 16, and adjacent sealing butt films 16 are sealed to each other. The right side of the buffer flow reducer seat 9 is fixedly connected with a magnetic block 18 through a frame, and a magnetic piece 17 is pasted on the inner wall of the sealing butt film 16. When the buffer flow reducer seat 9 is impacted and moved, it drives the magnetic block 18 to approach the magnetic piece 17 on the inner side of the sealing butt film 16. At the same time, the magnetic poles of the opposite surfaces of the magnetic piece 17 and the magnetic block 18 are the same. The sealing butt film 16 will undergo elastic deformation under the action of magnetic force to expand the gap between adjacent sealing butt films 16.

[0025] By adopting the above technical solution, after the injection barrel 1 inhales the medicine, the medicine application nozzle 7 is inserted into the body and close to the inflammation site, and then the pull rod 4 is pushed, so that the pull rod 4 drives the sealing rubber plug 3 to slide on the inner side of the injection barrel 1, and then the medicine in the injection barrel 1 is pushed to the medicine application nozzle 7 through the delivery pipe 6, and sprayed out through the medicine hole 8 to achieve medicine application. When the flow rate of the medicine is too fast, the buffer downflow seat 9 can block and slow the flow of the medicine. At the same time, when the buffer downflow seat 9 is impacted, it will drive the fixed plate 10 to slide elastically on the outer side of the guide column 11. At this time, the fixed plate 10 will The elastic air storage bag 13 is squeezed so that part of the gas in the elastic air storage bag 13 enters the elastic support bag 14 through the air guide tube 15. At this time, the elastic support bag 14 will expand and support the area near the inflammation, increasing the distance from the medicine hole 8 to the medicine application point, thereby further reducing the impact force of medicine application. At the same time, the buffer flow reduction seat 9 will drive the magnetic block 18 to approach the magnetic sheet 17 during movement, causing the sealing joint film 16 to deform under the action of the magnetic force, thereby increasing the gap between adjacent sealing joint films 16, thereby increasing the overall spraying aperture, and then reducing the flow rate of the medicine again.

[0026] Embodiment 2: The technical content disclosed in this embodiment is a further improvement on the above embodiment 1. The existing gynecological inflammation drug delivery device is inconvenient to limit the delivery speed of the drug during use, which makes it easy to push too hard and cause the drug impact force to be too large, affecting the comfort of use. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 1-Figure 6As shown; a movable locking plate 19 is rotatably installed at the left end of the handle 2, and a fixing ring 20 is also fixedly installed at the left end of the handle 2, and a limit assembly for limiting the advancement speed of the sealing rubber plug 3 is connected between the movable locking plate 19 and the fixing ring 20, the pull rod 4 passes through the movable locking plate 19, and the outer wall of the pull rod 4 is provided with a spiral guide groove 401, and the inner wall of the movable locking plate 19 is embedded with a ball 1901, and the ball 1901 rolls along the guide groove 401, and the limit assembly includes a receiving groove 1902 uniformly provided on the outer wall of the movable locking plate 19, and the inner side of the receiving groove 1902 is elastically rotatably connected with a positioning tooth 1903, and the inner wall of the fixing ring 20 is uniformly provided with a limiting groove 2001, the movable locking plate 19 and the fixing ring 20 are coaxially arranged, and the positioning tooth 1903 is elastically rotated and engaged with the limiting groove 2001.

[0027] By adopting the above-mentioned technical scheme, when the pull rod 4 is pushed, the ball 1901 embedded in the inner wall of the movable locking disk 19 will roll along the guide groove 401, thereby driving the movable locking disk 19 to rotate synchronously, and when the push speed of the pull rod 4 is too fast, the movable locking disk 19 will rotate rapidly, so that the positioning tooth 1903 on the inner side of the accommodating groove 1902 rotates and pops out under the action of centrifugal force. At this time, the movable locking disk 19 will drive the positioning tooth 1903 to automatically snap into the limit groove 2001 at the corresponding position during the rotation process, thereby locking the movable locking disk 19 to prevent the movable locking disk 19 from continuing to rotate, and then making the pull rod 4 unable to continue to push. At this time, the pushing speed of the medicine can be limited to prevent the pushing speed from being too fast, further reducing the delivery and impact speed of the medicine.

[0028] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-shock type gynecological inflammation drug delivery device provided with a slow flow mechanism, comprising a drug injection barrel (1) filled with a drug, a handle (2) fixedly mounted on the left end of the drug injection barrel (1), a sealing rubber plug (3) arranged on the inner side of the drug injection barrel (1), a pull rod (4) fixedly connected to the left side of the sealing rubber plug (3), and a push seat (5) fixedly mounted on the left end of the pull rod (4), a delivery pipe (6) connected to the right end of the delivery pipe (6), and a drug application nozzle (7) fixedly connected to the right end of the delivery pipe (6); It is characterized in that The medicine application nozzle (7) is provided with a medicine hole (8), and a slow-flow component for slowing down the flow rate of the medicine is arranged on the inner side of the medicine application nozzle (7), and a sealing butt rubber (16) is fixedly connected to the right end of the medicine application nozzle (7), and a movable locking plate (19) is rotatably mounted on the left end of the handle (2), and a fixing ring (20) is also fixedly mounted on the left end of the handle (2), and a limit assembly for limiting the advancement speed of the sealing rubber plug (3) is connected between the movable locking plate (19) and the fixing ring (20).

2. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 1, characterized in that: The pull rod (4) passes through the handle (2) and is slidably connected thereto, and the sealing rubber plug (3) connected to the right end of the pull rod (4) is in interference sliding connection with the inner wall of the injection barrel (1).

3. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 1, characterized in that: The slow flow assembly comprises a buffer flow reducer seat (9) arranged inside the medicine application nozzle (7), the buffer flow reducer seat (9) and the conveying pipe (6) are coaxially arranged, and the buffer flow reducer seat (9) and the medicine application nozzle (7) are elastically connected via an elastic telescopic mechanism, and the buffer flow reducer seat (9) elastically moves under the impact of the medicine in the conveying pipe (6).

4. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 3, characterized in that: The elastic telescopic mechanism comprises a fixed plate (10) fixedly mounted on the left side of the buffer flow reducer seat (9), a guide column (11) is slidably arranged through the fixed plate (10), and the guide column (11) is fixedly connected to the left inner wall of the medicine applying nozzle (7), and a spring (12) is fixedly connected between the fixed plate (10) and the left inner wall of the medicine applying nozzle (7).

5. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 4, characterized in that: An elastic gas storage bag (13) is sleeved on the outer side of the guide column (11), and the two ends of the elastic gas storage bag (13) are fixedly connected to the fixing plate (10) and the right end of the guide column (11) respectively, and an elastic support bag (14) is fixedly connected to the outer side of one end of the delivery pipe (6) close to the medicine spray nozzle (7), and the elastic support bag (14) and the elastic gas storage bag (13) are fixedly connected via an air guide pipe (15), and the elastic gas storage bag (13) delivers gas into the elastic support bag (14) after being pressurized, so that the elastic support bag (14) expands.

6. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 1, characterized in that: The right end of the medicine applying nozzle (7) is evenly and fixedly connected with a sealing butt rubber sheet (16), and adjacent sealing butt rubber sheets (16) are mutually abutted and sealed.

7. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 3, characterized in that: The right side of the buffer flow reducing seat (9) is fixedly connected to a magnetic block (18) through a frame, and the inner wall of the sealing butt joint film (16) is adhered to a magnetic sheet (17), and when the buffer flow reducing seat (9) is impacted and moved, the magnetic block (18) is driven to approach the magnetic sheet (17) inside the sealing butt joint film (16), and at the same time, the magnetic poles of the opposite surfaces of the magnetic sheet (17) and the magnetic block (18) are the same, and the sealing butt joint film (16) is elastically deformed under the action of magnetic force to expand the gap between adjacent sealing butt joint films (16).

8. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 1, characterized in that: The pull rod (4) passes through the movable locking plate (19), and a spiral guide groove (401) is provided on the outer wall of the pull rod (4), and a ball (1901) is embedded and installed on the inner wall of the movable locking plate (19), and the ball (1901) rolls along the guide groove (401).

9. The shock-proof gynecological inflammation medication device with a slow-flow mechanism according to claim 8, characterized in that: The limiting assembly comprises a receiving groove (1902) evenly formed on the outer wall of the movable locking plate (19), and the inner side of the receiving groove (1902) is elastically rotatably connected with a positioning tooth (1903), and the inner wall of the fixing ring (20) is evenly formed with a limiting groove (2001), the movable locking plate (19) and the fixing ring (20) are coaxially arranged, and the positioning tooth (1903) is elastically rotated to engage with the limiting groove (2001).

Images