Medical detection device for blood purification

Abstract

The invention belongs to the technical field of medical instruments, and provides a blood purification medical detection device which comprises an injector used for blood collection, transfer and other operations; the driving mechanism is arranged on the injector and is used for driving the injector to perform operations such as blood collection and transfer; the receiving mechanism is fixedly arranged on the injector and is used for assisting the injector in blood collection; the collecting mechanism is arranged in the receiving mechanism and is used for collecting blood; the transfer mechanism is arranged on the injector and is used for transferring blood; the connecting mechanism is arranged in the bearing mechanism and is used for limiting connection of the collecting mechanism; the needle head can slide out of the protective cylinder to be used when liquid such as blood and reagents needs to be collected, infection is avoided when the needle head collects the liquid, the one-way valve pipe and the liquid outlet pipe are each of a one-way flow guide structure, and infection between the liquid in the syringe and the outside is further avoided. Therefore, the detection accuracy of blood collected by the injector is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and more specifically, it is a medical detection device for blood purification. Background Art

[0002] Blood purification is a medical technology aimed at removing harmful substances, metabolic wastes, or excessive electrolytes from a patient's blood through specific devices and methods. At the same time, it corrects electrolyte disorders and acid-base imbalances in the blood to maintain the stability of the body's internal environment. Blood purification is mainly based on the principle of a semipermeable membrane, which is a special membrane material that allows small molecules (such as water, electrolytes, urea, etc.) to pass through while blocking large molecules (such as proteins, blood cells, etc.). During the blood purification process, the patient's blood is drawn out of the body and undergoes mass exchange with the dialysis fluid through the semipermeable membrane, thereby removing harmful substances and excessive water from the blood;

[0003] During the blood purification operation, operations such as blood collection and transfer after collection are required. However, during blood collection and blood transfer, the blood is easily exposed to the air and contaminated, resulting in a problem of reduced accuracy in subsequent blood detection.

[0004] Therefore, those skilled in the art have proposed a medical detection device for blood purification to solve the problems raised in the background art. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a medical detection device for blood purification to solve the problem that blood is contaminated during operations such as blood collection and transfer in the prior art.

[0006] A medical detection device for blood purification includes: a syringe for operations such as blood collection and transfer; a driving mechanism disposed on the syringe for driving the syringe to perform operations such as blood collection and transfer; a receiving mechanism fixedly disposed on the syringe for assisting the syringe in blood collection; a collection mechanism disposed within the receiving mechanism for blood collection; a transfer mechanism disposed on the syringe for blood transfer; and a connecting mechanism disposed within the receiving mechanism for limiting and connecting the collection mechanism.

[0007] Preferably, the driving mechanism includes a piston slidably disposed inside the syringe, and a lithium battery fixedly disposed on the side wall of the syringe; two electric push rods are symmetrically and fixedly disposed on the side wall of the syringe, and the output end of the electric push rod is fixedly disposed with the end of the piston.

[0008] Preferably, the receiving mechanism includes a receiving cylinder screwed onto the syringe. A threaded ring is fixedly arranged at the top of the receiving cylinder, and a threaded circle is fixedly arranged on the syringe. The syringe and the receiving cylinder are screwed together through the threaded circle and the threaded ring.

[0009] Preferably, the receiving mechanism further includes a one-way valve tube fixedly arranged at the bottom of the syringe. A connecting cylinder is fixedly arranged inside the receiving cylinder, and a first sealing film is fixedly arranged above the connecting cylinder inside the receiving cylinder. The end of the one-way valve tube is sealed with aluminum foil, and a sealing ring is fixedly arranged inside the connecting cylinder.

[0010] Preferably, the collecting mechanism includes a protective cylinder fixedly arranged at the bottom of the receiving cylinder. A communication hole is opened at the bottom of the protective cylinder. A connecting plate is slidably arranged inside the protective cylinder. A needle is fixedly arranged at the bottom of the connecting plate. A second sealing film is sleeved outside the needle at the bottom of the connecting plate. A transmission hose is fixedly arranged between the receiving cylinder and the connecting plate, and the communication hole is sealed with aluminum foil.

[0011] Preferably, the transfer mechanism includes a one-way valve fixedly arranged on the side wall of the syringe. The syringe is fixedly provided with a liquid outlet pipe through the one-way valve, and a sealing sleeve is sleeved outside the liquid outlet pipe.

[0012] Preferably, the connecting mechanism includes two first connecting plates symmetrically and fixedly arranged at the bottom of the receiving cylinder, and two second connecting plates symmetrically and fixedly arranged on both sides of the side wall of the connecting plate. A first spring is fixedly arranged between the first connecting plate and the second connecting plate.

[0013] Preferably, the connecting mechanism further includes a torsion rotating shaft rotatably arranged on the second connecting plate. The second connecting plate elastically rotates a limit slider through the torsion rotating shaft. Upper limit hooks and lower limit hooks are symmetrically and fixedly arranged on the inner wall of the limit slider, and both the upper limit hook and the lower limit hook are elastically arranged with the second connecting plate through a second spring. Fixed hooks are fixedly arranged on both the first connecting plate and the protective cylinder, and two limit sliding grooves are symmetrically opened on the side wall of the protective cylinder.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention is provided with a syringe, enabling the collection of blood inside the syringe and transfer operations at the liquid outlet pipe. The syringe is rotatably connected through a receiving cylinder, allowing different receiving cylinders to be replaced when collecting different blood samples and reagents, thus avoiding cross-infection during collection. Meanwhile, a connection plate and a needle are slidably connected inside a protective cylinder at the bottom of the receiving cylinder. When the needle is needed to collect liquids such as blood and reagents, it can slide out of the protective cylinder for use and can be placed inside the protective cylinder when not in use, thereby ensuring that the needle is in a sterile environment and avoiding infection during liquid collection by the needle. Secondly, both the one-way valve pipe and the liquid outlet pipe are one-way flow guiding structures, further preventing the liquid inside the syringe from being infected by the outside, thus improving the accuracy of blood collection and detection by the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structure diagram of the blood collection and transfer device of the present invention;

[0017] Figure 2 is the connection structure diagram of the blood collection and transfer device of the present invention;

[0018] Figure 3 For the present invention Figure 2 structure diagram at position A;

[0019] Figure 4 is the overall structure diagram of the receiving cylinder of the present invention;

[0020] Figure 5 is the connection structure diagram of the receiving cylinder of the present invention;

[0021] Figure 6 is the connection structure diagram of the connecting cylinder of the present invention;

[0022] Figure 7 is the connection structure diagram of the needle of the present invention;

[0023] Figure 8 is the connection structure diagram of the limit slider of the present invention.

[0024] In the figure:

[0025] 1, syringe; 2, piston; 3, electric push rod; 4, lithium battery; 5, thread ring; 6, one-way valve pipe; 7, receiving cylinder; 8, protective cylinder; 9, communication hole; 10, one-way valve; 11, liquid outlet pipe; 12, sealing sleeve; 13, thread ring; 14, sealing film one; 15, limit chute; 16, limit slider; 17, connecting cylinder; 18, connecting plate one; 19, transmission hose; 20, spring one; 21, connection plate; 22, sealing film two; 23, connecting plate two; 24, fixed hook; 25, needle; 26, upper limit hook; 27, lower limit hook; 28, torsion rotating shaft; 29, spring two. Detailed Embodiments

[0026] The following further describes the embodiments of the present invention in detail in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0027] Embodiment 1:

[0028] As shown in the Figure 1 to Figure 8 accompanying drawings:

[0029] The present invention provides a medical detection device for blood purification, including: a syringe 1 for operations such as blood collection and transfer; a driving mechanism disposed on the syringe 1 for driving the syringe 1 to perform operations such as blood collection and transfer; a receiving mechanism fixedly disposed on the syringe 1 for assisting the syringe 1 in blood collection; a collection mechanism disposed in the receiving mechanism for blood collection; a transfer mechanism disposed on the syringe 1 for blood transfer; and a connection mechanism disposed in the receiving mechanism for limit connection of the collection mechanism.

[0030] By providing the syringe 1, blood can be collected inside the syringe 1, and transfer operations can be performed at the liquid outlet pipe 11. Moreover, the syringe 1 is threadedly connected through the receiving cylinder 7, so that when the syringe 1 collects different blood and reagents, different receiving cylinders 7 can be replaced for collection, thereby avoiding cross-infection during collection. At the same time, a connection disk 21 and a needle 25 are slidably connected inside the protective cylinder 8 at the bottom of the receiving cylinder 7, so that when the needle 25 needs to collect liquids such as blood and reagents, it can slide out of the protective cylinder 8 for use and can be placed in the protective cylinder 8 when not in use, thereby achieving that the needle 25 can be in a sterile environment and avoiding infection when the needle 25 collects liquids. Secondly, both the one-way valve pipe 6 and the liquid outlet pipe 11 are one-way flow guiding structures, further avoiding the infection between the liquid inside the syringe 1 and the outside, thereby improving the accuracy of blood collection and detection by the syringe 1.

[0031] Referring to Figure 1 and Figure 2 , the driving mechanism includes a piston 2, an electric push rod 3, and a lithium battery 4;

[0032] By slidably connecting a piston 2 inside the syringe 1, when the syringe 1 performs operations such as blood collection and transfer, it is convenient to operate through the piston 2. Two electric push rods 3 are symmetrically and fixedly connected to the side wall of the syringe 1, and the output end of the electric push rod 3 is fixedly connected to the piston 2. Thus, during use, the piston 2 can be telescopically driven through the two electric push rods 3, thereby achieving the purpose of pushing and pulling the piston 2 for extrusion and suction use.

[0033] At the same time, a lithium battery 4 is fixedly connected to the side wall of the syringe 1 , so that the lithium battery 4 can be connected to an external power source for charging and discharging, thereby achieving the purpose of providing power for the electric push rod 3 .

[0034] refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 The receiving mechanism includes a receiving tube 7, a connecting tube 17 and a sealing membrane 14;

[0035] The receiving tube 7 is screwed and connected to the bottom of the syringe 1, and the threaded ring 5 is fixedly connected to the syringe 1, and the threaded ring 13 is fixedly connected to the top of the receiving tube 7, so that the receiving tube 7 can be easily screwed and connected to the syringe 1 through the threaded ring 13 and the threaded ring 5 for use, and different receiving tubes 7 can be replaced for use by screwing the threaded ring 5 and the threaded ring 13. For example, when blood needs to be mixed with multiple reagents for testing, different receiving tubes 7 can be replaced to assist in introducing different reagents into the syringe 1 and mixing with the blood for testing;

[0036] At the same time, a one-way valve tube 6 is fixedly connected to the bottom of the syringe 1, so that the syringe 1 can easily introduce blood, reagents and other liquids into the syringe 1 through the one-way valve tube 6. The one-way valve tube 6 has a one-way operation restriction, and can only guide the liquid from the outside of the one-way valve tube 6 to the inside of the syringe 1. The liquid inside the syringe 1 cannot be guided out of the one-way valve tube 6, so as to prevent the liquid in the syringe 1 from flowing out of the one-way valve tube 6, and a connecting tube 17 is fixedly connected to the inside of the receiving tube 7, so that the syringe 1 can pass through the one-way valve tube 6 and the connecting tube 17. The receiving tube 7 is connected to the connecting tube 17, so as to facilitate the collection of liquids such as blood and reagents through the receiving tube 7, and a sealing film 14 is fixedly connected to the inside of the receiving tube 7 above the connecting tube 17, so that before the receiving tube 7 is connected to the one-way valve tube 6, the inside of the receiving tube 7 is sealed and protected by the sealing film 14, and when the receiving tube 7 and the connecting tube 17 are connected, it is also convenient to disinfect the one-way valve tube 6 and the outside of the sealing film 14 in the receiving tube 7, thereby reducing the possibility of contamination when the one-way valve tube 6 and the connecting tube 17 are connected;

[0037] Secondly, an aluminum foil is sealed on the one-way valve tube 6 to protect the inside of the one-way valve tube 6, and a sealing ring is fixedly connected to the inside of the connecting tube 17, so that when the one-way valve tube 6 and the connecting tube 17 are connected, a sealed connection can be achieved. When the one-way valve tube 6 and the connecting tube 17 are connected, the aluminum foil on the one-way valve tube 6 is directly torn off to make the one-way valve tube 6 pierce the sealing film 14, and then the threaded ring 5 and the threaded ring 13 are screwed together to make the one-way valve tube 6 tightly connected to the connecting tube 17.

[0038] Embodiment 2:

[0039] Reference Figure 1 、 Figure 6 and Figure 7 ,the collection mechanism includes a protective cylinder 8, a connecting plate 21, a needle 25 and a transmission hose 19;

[0040] By fixedly connecting a protective cylinder 8 at the bottom of the receiving cylinder 7, a connecting plate 21 is slidably connected inside the protective cylinder 8, a needle 25 is fixedly connected to the bottom of the connecting plate 21, and a transmission hose 19 is fixedly connected between the connecting plate 21 and the receiving cylinder 7, so that the connecting cylinder 17 and the needle 25 can be connected through the transmission hose 19. Therefore, during the use of the syringe 1 and the receiving cylinder 7, when it is necessary to collect liquids such as blood and reagents, the needle 25 can be inserted into the place to be taken, then the liquid is taken by the needle 25, and finally it is introduced into the syringe 1 through the transmission hose 19, the connecting cylinder 17 and the one-way valve tube 6;

[0041] At the same time, a second sealing film 22 is sleeved outside the needle 25, and a communication hole 9 is opened at the bottom of the protective cylinder 8, so that during the use of the needle 25, it can directly pierce the second sealing film 22 and slide out directly from the communication hole 9 for use, so as to ensure that the needle 25 is always in a sterile environment before use, and the outside of the communication hole 9 is sealed with aluminum foil. Before use, the inside of the communication hole 9 is in a sterile environment and can be used after tearing it off before use.

[0042] Reference Figure 2 and Figure 3 ,the transfer mechanism includes a one-way valve 10, a liquid outlet pipe 11 and a sealing sleeve 12;

[0043] By fixedly connecting a one-way valve 10 to the side wall of the syringe 1, the syringe 1 is conveniently fixedly connected with a liquid outlet pipe 11 through the one-way valve 10. When the liquid inside the syringe 1 needs to be transferred to the outside, it can be exported through the liquid outlet pipe 11 for transfer, and the one-way valve 10 is set to have a one-way transmission function, so that the liquid in the syringe 1 can only be exported outward through the one-way valve 10 and the liquid outlet pipe 11 and cannot flow back inward, thereby avoiding the liquid at the liquid outlet pipe 11 flowing back and causing pollution of the liquid inside the syringe 1. And a sealing sleeve 12 is sleeved outside the liquid outlet pipe 11, so that the sealing sleeve 12 can seal and protect the liquid outlet pipe 11 and make the liquid outlet pipe 11 in a sterile environment. At the same time, during use, first remove the sealing sleeve 12, and the outside of the liquid outlet pipe 11 also needs to be disinfected.

[0044] Embodiment 3:

[0045] Reference Figure 1 、 Figure 6 、 Figure 7 and Figure 8 ,the connecting mechanism includes a first connecting plate 18, a second connecting plate 23, a first spring 20 and a limit slider 16;

[0046] Two limiting sliding grooves 15 are symmetrically formed in the side wall of the protective cylinder 8, and two second connecting plates 23 are symmetrically and fixedly connected to the side wall of the connecting plate 21, so that the limiting sliding blocks 16 are elastically rotated and connected to the second connecting plates 23 through torsion rotating shafts 28. In this way, the connecting plate 21 can be connected to the inside of the protective cylinder 8 in a limited sliding manner through the second connecting plates 23 and the limiting sliding grooves 15, and the limiting sliding blocks 16 can perform sliding operations on the connecting plate 21 on the outside of the protective cylinder 8;

[0047] Meanwhile, a first connecting plate 18 is fixedly connected to the bottom of the receiving cylinder 7, and a first spring 20 is fixedly connected between the first connecting plate 18 and the second connecting plate 23, so that the connecting plate 21 is elastically and slidably connected to the inside of the protective cylinder 8 through the two first connecting plates 18, the second connecting plates 23 and the first spring 20. Fixed hooks 24 are fixedly connected to both the first connecting plate 18 and the second connecting plate 23, and an upper limiting hook 26 and a lower limiting hook 27 are symmetrically and fixedly connected to the inner wall of the limiting sliding block 16. Secondly, the upper limiting hook 26 and the lower limiting hook 27 are elastically connected to the second connecting plate 23 through a second spring 29. When the needle 25 is not in use, the connecting plate 21 is clamped to the fixed hooks 24 at the bottom of the two first connecting plates 18 through the two upper limiting hooks 26, so that the needle 25 and the second sealing film 22 are both placed inside the protective cylinder 8 for protection, thereby avoiding collision damage and contamination of the needle 25. When the needle 25 needs to be used, by pressing the limiting sliding block 16, the upper limiting hook 26 is loosened from the clamping with the second sealing film 22 at the bottom of the first connecting plate 18, and the connecting plate 21 and the needle 25 slide downward inside the protective cylinder 8 through the elastic force of the first spring 20, so that the needle 25 pierces the second sealing film 22 and slides out from the communication hole 9 for use. At this time, the connecting plate 21 is further slid downward through the limiting sliding block 16, so that the lower limiting hook 27 is clamped inside the fixed hook 24 on the protective cylinder 8, achieving the purpose of fixing the using position of the connecting plate 21, that is, the needle 25. After the needle 25 is used up, by pressing the limiting sliding block 16 again, the lower limiting hook 27 is loosened from the clamping with the fixed hook 24, and finally the limiting sliding block 16 and the connecting plate 21 are pushed, so that the upper limiting hook 26 is clamped to the fixed hook 24 at the bottom of the first connecting plate 18 again, and the needle 25 retracts into the protective cylinder 8 for placement, avoiding potential safety hazards caused by the needle 25 being exposed outside the protective cylinder 8.

[0048] Working principle: A piston 2 is slidably connected inside the syringe 1, enabling the syringe 1 to be easily operated by the piston 2 during operations such as blood collection and transfer. Two electric push rods 3 are symmetrically and fixedly connected to the side wall of the syringe 1, and the output ends of the electric push rods 3 are fixedly connected to the piston 2. Thus, during use, the piston 2 can be telescopically driven by the two electric push rods 3 to achieve the purpose of pushing and pulling the piston 2 for extrusion and suction. At the same time, a receiving cylinder 7 is screwed onto the bottom of the syringe 1, and a threaded ring 5 is fixedly connected to the syringe 1. A threaded ring 13 is fixedly connected to the top of the receiving cylinder 7, enabling the receiving cylinder 7 to be easily screwed onto the syringe 1 through the threaded ring 13 and the threaded ring 5 for use, and also enabling different receiving cylinders 7 to be screwed and replaced through the threaded ring 5 and the threaded ring 13 for use. Secondly, a one-way valve 10 is fixedly connected to the side wall of the syringe 1, enabling the syringe 1 to be fixedly connected to a liquid outlet pipe 11 through the one-way valve 10. When the liquid inside the syringe 1 needs to be transferred to the outside, it can be exported through the liquid outlet pipe 11 for transfer. The one-way valve 10 is set to have a one-way transmission function, enabling the liquid inside the syringe 1 to only be exported outward through the one-way valve 10 and the liquid outlet pipe 11 and not flow back inward, thereby avoiding the pollution of the liquid inside the syringe 1 caused by the liquid reflux at the liquid outlet pipe 11.

[0049] The embodiments of the present invention are given for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0050] Finally, the following points should be noted:

[0051] First of all, in the description of the present application, it should be noted that unless otherwise specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. It can be a mechanical connection or an electrical connection, or it can be the communication inside two components. It can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change;

[0052] Secondly: In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments of the present invention are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0053] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention;

[0054] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A medical detection device for blood purification, characterized in that, Comprising: A syringe (1) for operations such as blood collection and transfer; A driving mechanism disposed on the syringe (1) for driving the syringe (1) to perform operations such as blood collection and transfer; A receiving mechanism fixedly disposed on the syringe (1) for assisting the syringe (1) in blood collection; A collection mechanism disposed within the receiving mechanism for blood collection; A transfer mechanism disposed on the syringe (1) for blood transfer; A connection mechanism disposed within the receiving mechanism for limiting connection of the collection mechanism.

2. The medical detection device for blood purification according to claim 1, wherein: The driving mechanism includes a piston (2) slidably disposed inside the syringe (1), and a lithium battery (4) is fixedly disposed on the side wall of the syringe (1); Two electric push rods (3) are symmetrically and fixedly disposed on the side wall of the syringe (1), and the output end of the electric push rod (3) is fixedly disposed with the end of the piston (2).

3. The medical detection device for blood purification according to claim 1, wherein: The receiving mechanism includes a receiving cylinder (7) screwed onto the syringe (1), a threaded ring (13) is fixedly disposed on the top of the receiving cylinder (7), and a threaded circle (5) is fixedly disposed on the syringe (1); And the syringe (1) and the receiving cylinder (7) are screwed together through the threaded circle (5) and the threaded ring (13).

4. The blood purification medical detection device according to claim 3, wherein: The receiving mechanism further includes a one-way valve tube (6) fixedly disposed at the bottom of the syringe (1), a connecting cylinder (17) is fixedly disposed inside the receiving cylinder (7), and a first sealing film (14) is fixedly disposed above the connecting cylinder (17) inside the receiving cylinder (7); And the end of the one-way valve tube (6) is sealed with aluminum foil, and a sealing ring is fixedly disposed inside the connecting cylinder (17).

5. The medical detection device for blood purification according to claim 1, characterized in that: The collection mechanism includes a protective cylinder (8) fixedly disposed at the bottom of the receiving cylinder (7), a communication hole (9) is opened at the bottom of the protective cylinder (8), a connecting disk (21) is slidably disposed inside the protective cylinder (8), a needle (25) is fixedly disposed at the bottom of the connecting disk (21), and a second sealing film (22) is sleeved outside the needle (25) at the bottom of the connecting disk (21); A transmission hose (19) is fixedly disposed between the receiving cylinder (7) and the connecting disk (21), and the communication hole (9) is sealed with aluminum foil.

6. The medical detection device for blood purification according to claim 1, characterized in that: The transfer mechanism includes a one-way valve (10) fixedly disposed on the side wall of the syringe (1), a liquid outlet pipe (11) is fixedly disposed on the syringe (1) through the one-way valve (10), and a sealing sleeve (12) is sleeved outside the liquid outlet pipe (11).

7. The blood purification medical detection device according to claim 5, characterized in that: The connection mechanism includes two first connecting plates (18) symmetrically and fixedly disposed at the bottom of the receiving cylinder (7), and two second connecting plates (23) are symmetrically and fixedly disposed on both sides of the side wall of the connecting disk (21); A first spring (20) is fixedly disposed between the first connecting plate (18) and the second connecting plate (23).

8. The blood purification medical detection device according to claim 7, characterized in that: The connecting mechanism further includes a torsion rotating shaft (28) rotatably arranged on the second connecting plate (23). The second connecting plate (23) is elastically rotatably provided with a limiting slider (16) through the torsion rotating shaft (28). Upper limiting hooks (26) and lower limiting hooks (27) are symmetrically and fixedly arranged on the inner wall of the limiting slider (16), and both the upper limiting hooks (26) and the lower limiting hooks (27) are elastically arranged with the second connecting plate (23) through second springs (29). Fixed hooks (24) are fixedly arranged on both the first connecting plate (18) and the protective cylinder (8). Two limiting sliding grooves (15) are symmetrically formed in the side wall of the protective cylinder (8).

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