A filling needle

Abstract

The present application relates to a filling needle, and to the technical field of filling mechanisms. It includes a syringe body, and the syringe body includes a needle tube, a plug tube, a tightening block, and a connecting tube that are connected in sequence. A planar liquid outlet is provided at the opening of the syringe tube. The plug tube and the tightening block are used to install the syringe body with the filling machine, and the connecting tube is used to connect the syringe body and the infusion tube of the filling machine. The present application has the effect of setting the opening of the syringe tube to be planar, so that the surface tension of the liquid at the opening is greater, thereby effectively improving the problem of easy dripping of the liquid in the syringe, improving the safety of the filling machine, and protecting the surrounding working environment and the health of the staff.

Description

Technical Field

[0001] The present application relates to the technical field of filling mechanisms, and in particular to a filling needle. Background Art

[0002] A filling machine is a type of packaging machine, which is often used to hold liquids. It has the function of separating liquids from air and improving the purity of the liquid.

[0003] In the prior art, a filling needle is usually installed at the infusion port of the filling machine, and liquid is injected into the container through the filling needle. As an important component of the filling machine, the filling needle plays an important role in pure infusion of the liquid.

[0004] With respect to the above-mentioned related technologies, the inventors found that the opening of the existing filling needle is generally a pointed structure. When the filling machine is working, the medicine that has entered the filling needle drips through the pointed structure of the filling needle, causing the medicine to pollute the surrounding environment, so there is room for improvement. Summary of the invention

[0005] In order to improve the problem that a filling needle with an open tip is prone to causing liquid dripping, the present application provides a filling needle.

[0006] A filling needle provided in this application adopts the following technical solution:

[0007] A filling needle comprises a syringe body, wherein the syringe body comprises a needle tube, a plug tube, a tightening block and a connecting tube which are connected in sequence, a planar liquid outlet is provided at the opening of the syringe tube, the plug tube and the tightening block are used to install the syringe body with a filling machine, and the connecting tube is used to connect the syringe body with the infusion tube of the filling machine.

[0008] By adopting the above technical solution, the opening of the needle tube is set as a flat liquid outlet, so that the medicine liquid at the opening of the needle tube can have a greater surface tension. Compared with the pointed liquid outlet, the probability of dripping of the medicine liquid in this structure can be effectively reduced, thereby protecting the working environment around the filling machine and the health of the staff.

[0009] Preferably, a buffer tube is provided on the inner wall of the connection point between the plug-in tube and the abutting block, a liquid seepage hole is opened on the side wall of the buffer tube close to the abutting block, and the buffer tube is connected with the plug-in tube through the liquid seepage hole.

[0010] By adopting the above technical solution, the buffer tube is provided so that the syringe body of the present application can contain a portion of the liquid medicine flowing out of the infusion tube of the filling machine after the filling machine stops working. When the liquid medicine is located in the buffer tube, it can effectively improve the problem of continuous entry of liquid medicine into the syringe and dripping of liquid medicine at the opening of the syringe.

[0011] Preferably, the needle tube is inserted into the plug-in tube and abuts against the bottom wall of the buffer tube, a floating plate is provided in the plug-in tube, the floating plate is sleeved on the outer wall of the needle tube, a limiting rod is provided on the bottom wall of the plug-in tube, the limiting rod passes through the floating plate, a return spring is provided between the bottom wall of the plug-in tube and the floating plate, the return spring is sleeved on the outer wall of the limiting rod, and a flow hole is opened on the outer wall of the needle tube located between the floating plate and the bottom wall of the plug-in tube.

[0012] By adopting the above technical scheme, when too much liquid medicine overflows from the buffer tube, the liquid medicine will enter the inside of the plug-in tube and fall on the surface of the floating plate, so that the reset spring is compressed. When too much liquid accumulates on the surface of the floating plate, the floating plate will leak the flow hole, and the liquid medicine can enter the needle tube, thereby further improving the capacity of the filling needle of the present application to hold liquid medicine, further improving the problem of easy dripping of liquid medicine when the filling machine is not in working state, protecting the working environment around the filling machine and the health of the staff, and having higher safety.

[0013] Preferably, a limiting plate is provided at one end of the limiting rod extending out of the floating plate.

[0014] By adopting the above technical solution, the setting of the limit plate can effectively prevent the floating plate from detaching from the limit rod under the elasticity of the return spring, resulting in the problem that the floating plate is difficult to slide along the length direction of the limit rod. This effectively reduces the problem of drug liquid blockage in the insertion tube and the inability of the drug liquid to enter the syringe, and has high practicality and safety.

[0015] Preferably, the buffer tube includes a fixed tube and a plurality of opening and closing pieces, the fixed tube abuts against the inner wall of the opening of the plug-in tube close to the tightening block, the plurality of opening and closing pieces are arranged at one end of the fixed tube close to the needle tube, the plurality of opening and closing pieces are spliced ​​with each other and abut against the end of the plug-in tube with the needle tube inserted therein, a driving assembly is arranged in the plug-in tube, the driving assembly is used to drive the plurality of opening and closing pieces to move in directions away from each other, and the fixed tube is connected to the needle tube after the plurality of opening and closing pieces move away from each other.

[0016] By adopting the above technical solution, the opening and closing piece and the driving assembly are provided so that the fixed tube and the needle tube can be transformed from a closed state to a connected state, so that the filling needle of the present application can effectively improve the efficiency of liquid medicine filling when used in liquid medicine filling work in large-capacity containers, and has high practicality and convenience.

[0017] Preferably, the driving assembly comprises a plurality of connecting sleeves, a plurality of connecting rods, a rotating cover and a plurality of locking pieces, the connecting sleeves, the connecting rods and the opening and closing pieces corresponding to each other one by one; the connecting sleeve is arranged on the side wall of the corresponding opening and closing piece away from the other opening and closing pieces, one end of the connecting rod is inserted into the connecting sleeve, the connecting rod is arranged vertically, the tightening block is penetrated along the thickness direction and is provided with an adjustment groove for the connecting rod to pass through and slide, the rotating cover is rotatably connected to the outer wall of the connecting tube, and a plurality of first pushing blocks are arranged on the inner wall of the opening where the rotating cover is attached to the connecting sleeve, the first pushing blocks and the connecting rods correspond to each other one by one, the distance of the outer wall of the first pushing block away from the connecting sleeve gradually increases from one end toward the other end, the inner circumferential wall of the rotating cover is provided with a plurality of second pushing blocks corresponding to the first pushing block, and the distance of the outer wall of the second pushing block from the connecting tube gradually increases from one end toward the other end, the connecting rod abuts between the corresponding first pushing blocks and the second pushing blocks, and when the rotating cover rotates, the first pushing block pushes the connecting rod to slide along the length direction of the adjusting groove; the plurality of locking pieces pass through the rotating cover and are connected to the tightening blocks.

[0018] By adopting the above technical scheme, when the rotating cover is rotated during use, the first pushing block gradually increases the distance between the contact point with the connecting rod and the connecting tube as it rotates. Due to the limiting effect of the adjusting groove, the connecting rod can only slide along the length direction of the adjusting groove, and cooperate with the first pushing block to push the connecting rod to slide along the length direction of the adjusting groove, so that the connecting rod can drive the opening and closing piece to extend out of the gap between the fixed tube and the needle tube. After the adjustment is completed, the rotating cover and the locking block can be locked by the locking piece, so that the medicine can directly enter the needle tube through the fixed tube, thereby realizing the rapid injection of medicine into a large-capacity container. The structure is simple and easy to implement. At the same time, after the floating piece fails and cannot be raised or lowered, the medicine can continue to circulate in the filling needle, without affecting the work efficiency, thereby improving the practicality and convenience of the present application.

[0019] Preferably, an elastic member is provided in the adjusting groove, and the elastic member is used to drive the connecting rod to move and then reset.

[0020] By adopting the above-mentioned technical scheme, the elastic part is set, on the one hand, which can drive the connecting rod to slide and then reset, so that the opening and closing pieces can be re-connected; on the other hand, it can effectively reduce the friction generated when the connecting rod slides in the adjustment groove, thereby reducing the wear between the connecting rod and the inner wall of the adjustment groove, protecting the structural integrity of the locking block and the driving assembly of the present application, extending the service life, and having higher economic benefits.

[0021] Preferably, the side walls of the connecting rod facing the adjusting groove in both length directions are provided with folding bellows, the other end of the folding bellows is connected to the inner wall of the adjusting groove, and the connecting rod drives the folding bellows to fold or expand when sliding along the adjusting groove.

[0022] By adopting the above-mentioned technical solution, a folding bellows is provided, and the folding bellows on both sides of the connecting rod can fold or relax accordingly with the movement of the connecting rod, thereby covering the adjustment groove. This can effectively improve the sealing performance of the drive assembly of the present application, reduce the probability of the drug solution penetrating into the rotating cover and further penetrating out of the syringe body, and improve the stability and safety of the filling machine and the filling needle during operation.

[0023] Preferably, the outer wall of the connecting pipe is provided with anti-slip protrusions.

[0024] By adopting the above technical solution, the provision of anti-slip protrusions can effectively reduce the probability of falling off and liquid medicine leakage between the connecting tube and the infusion tube of the filling machine, thereby improving the stability and safety of the filling machine during operation.

[0025] Preferably, the material of the syringe body is titanium.

[0026] By adopting the above technical scheme, titanium metal has many advantages such as high strength, high thermal strength, good corrosion resistance, good low-temperature performance, etc. The filling needle is made of titanium metal, so that the filling needle is not easily damaged and can withstand the corrosion of the liquid medicine, thereby improving the purity of the liquid medicine and the safety of the filling machine.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. By setting the opening of the needle tube as a flat liquid outlet, the needle tube of the present application can have a greater tension of the liquid at the tube mouth than the pointed needle tube, thereby effectively reducing the problem of easy dripping of the liquid at the tube mouth when the filling machine is not working, protecting the working environment around the filling machine and the health of the staff, and having high safety;

[0029] 2. The provision of a buffer tube and a floating sheet can effectively improve the liquid medicine holding capacity of the plug tube of the present application, so that after the filling machine stops working, the liquid medicine still flowing into the syringe body from the infusion tube of the filling machine can be temporarily stored, so that there is no continuous entry of liquid medicine into the syringe, further reducing the probability of liquid medicine dripping and improving the practicality and safety of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of a filling needle in Example 1 of the present application.

[0031] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0032] Figure 3 It is a schematic diagram of the structure of the syringe body of Example 2 of the present application.

[0033] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle.

[0034] Figure 5 It is a schematic diagram of the structure of the first pushing block and the second pushing block of Example 2 of the present application.

[0035] Explanation of the accompanying drawings: 1. Syringe body; 11. Needle tube; 111. Planar liquid outlet; 112. Circulation hole; 12. Plug-in tube; 13. Tightening block; 131. Adjusting groove; 14. Connecting tube; 141. Anti-slip protrusion; 2. Buffer tube; 21. Fixed tube; 211. Seepage hole; 22. Opening and closing piece; 3. Floating piece; 31. Limit rod; 311. Limit plate; 32. Reset spring; 4. Driving assembly; 41. Connecting sleeve; 42. Connecting rod; 43. Rotating cover; 431. First push block; 432. Second push block; 44. Locking piece; 5. Elastic piece; 6. Folding bellows. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-5 This application is described in further detail.

[0037] Embodiment 1:

[0038] Example 1 of the present application discloses a filling needle. Figure 1 A filling needle comprises a syringe body 1, which comprises a needle tube 11, a plug tube 12, a tightening block 13 and a connecting tube 14. In this embodiment, the plug tube 12 is connected to an end wall of one side of the tightening block 13 by welding, and one end of the connecting tube 14 is connected to an end wall of the tightening block 13 away from the plug tube 12 by welding. One end of the needle tube 11 passes through the plug tube 12 and the tightening block 13 in turn and is inserted into the inner wall of the end of the connecting tube 14 away from the tightening block 13. The openings of the needle tube 11 and the connecting tube 14 are connected by full welding, and the needle tube 11, the plug tube 12, the tightening block 13 and the connecting tube 14 are all coaxially arranged.

[0039] Reference Figure 1 and Figure 2The plug-in tube 12 and the tightening block 13 are used to install the syringe body 1 with the filling machine. The outer wall of the end of the plug-in tube 12 away from the tightening block 13 is provided with a guide surface along the circumferential direction for facilitating the installation of the plug-in tube 12; the connecting tube 14 is used to connect the syringe body 1 and the infusion tube of the filling machine. The outer wall of the connecting tube 14 is provided with a plurality of anti-slip protrusions 141, and the plurality of anti-slip protrusions 141 are evenly distributed along the length direction of the connecting tube 14, so that a stable connection can be formed with the infusion tube of the filling machine, reducing the probability of the infusion tube falling off, effectively preventing the leakage of the liquid medicine, and improving the safety of operation; a planar liquid outlet 111 is provided at the opening of the needle tube 11. In this embodiment, the material of the syringe body 1 is metal titanium, so that the body of the needle tube 11 has high strength and corrosion resistance, which plays an effect of protecting the structural integrity of the syringe body 1 during the liquid medicine filling process.

[0040] The implementation principle of a filling needle in Example 1 of the present application is as follows: the opening of the needle tube 11 is opened into a plane shape, so that when the filling machine stops working, the medicine at the opening of the needle tube 11 can have a greater surface tension than the pointed opening, making it difficult for the medicine to drip, thereby protecting the working environment around the filling machine and the health of the staff, and having higher stability and safety.

[0041] Embodiment 2:

[0042] Example 2 of the present application discloses a filling needle. Figure 3 , including a syringe body 1, the syringe body 1 includes a needle tube 11, a plug tube 12, a tightening block 13 and a connecting tube 14 connected in sequence, a buffer tube 2 is integrally formed on the inner wall of the connection point between the plug tube 12 and the tightening block 13, the buffer tube 2 is arranged toward the needle tube 11, a side wall of the buffer tube 2 close to the tightening block 13 is provided with a plurality of seepage holes 211, and the plurality of seepage holes 211 are evenly distributed along the circumferential direction of the outer wall of the buffer tube 2, the buffer tube 2 is connected with the plug tube 12 through the seepage holes 211, when the filling machine stops working, the buffer tube 2 can carry a part of the liquid medicine, so that the liquid medicine cannot directly enter the needle tube 11, until there is too much liquid medicine and overflows from the seepage holes 211, there is no continuous flow of liquid medicine in the needle tube 11, the probability of liquid medicine leakage in the needle tube 11 can be further reduced, thereby improving safety.

[0043] Reference Figure 3The needle tube 11 is inserted into the plug tube 12 and abuts against the bottom wall of the buffer tube 2. The needle tube 11 and the opening of the plug tube 12 are connected by full welding. A floating sheet 3 is arranged in the plug tube 12. The floating sheet 3 is sleeved on the outer wall of the needle tube 11 and can slide along the length direction of the needle tube 11. A plurality of limiting rods 31 are integrally formed on the inner wall and bottom wall of the plug tube 12. The plurality of limiting rods 31 are evenly distributed along the circumferential direction of the needle tube 11. The plurality of limiting rods 31 are vertically arranged and one end passes through the floating sheet 3. The limiting rod 31 passes through one end of the floating sheet 3 and is integrally formed with a limiting sheet 311 to prevent the floating sheet 3 from detaching from the limiting rod 31.

[0044] Reference Figure 3 and Figure 4 A plurality of return springs 32 are arranged between the bottom wall of the plug tube 12 and the floating sheet 3, each return spring 32 corresponds to a limit rod 31, and the return spring 32 is sleeved on the outer wall of the corresponding limit rod 31, one end of the return spring 32 is against the bottom wall of the floating sheet 3, and the other end is against the bottom wall inside the plug tube 12, and the outer wall of the needle tube 11 between the floating sheet 3 and the bottom wall of the plug tube 12 is provided with a plurality of flow holes 112, and the plurality of flow holes 112 are evenly distributed along the circumferential direction of the outer wall of the needle tube 11. When there is too much liquid medicine in the buffer tube 2, the liquid medicine will pass through the seepage hole 211 and enter the plug tube 12 and fall on the surface of the floating sheet 3. The floating sheet 3 bears the pressure of the liquid medicine, so that the return spring 32 is compressed until the flow hole 112 of the needle tube 11 is exposed, and the liquid medicine will enter the needle tube 11, further improving the liquid medicine carrying capacity of the syringe body 1 of the present application, and effectively reducing the problem of liquid medicine dripping.

[0045] Reference Figure 3 and Figure 4 The buffer tube 2 includes a fixed tube 21 and a plurality of opening and closing pieces 22. The fixed tube 21 and the inner wall of the opening of the plug-in tube 12 near the clamping block 13 are integrally formed. The plurality of opening and closing pieces 22 are arranged at the opening of one end of the fixed tube 21 away from the clamping block 13, and the end of the needle tube 11 inserted into the plug-in tube 12 is against the bottom wall of the opening and closing piece 22.

[0046] Reference Figure 3 and Figure 4 After the opening and closing pieces 22 are spliced ​​together, the connection between the fixed tube 21 and the needle tube 11 can be blocked, so that the liquid medicine entering the buffer tube 2 can only remain on the surface of the opening and closing pieces 22. A driving component 4 is arranged in the plug-in tube 12. The driving component 4 is used to drive the plurality of opening and closing pieces 22 to move in directions away from each other and restore the connection between the fixed tube 21 and the needle tube 11, so that the filling machine can quickly and continuously inject a large-capacity container liquid medicine and deal with the emergency situation of clogging in the filling needle after the floating piece 3 is difficult to slide, so as to improve work efficiency.

[0047] Reference Figure 3 and Figure 4The driving assembly 4 includes a plurality of connecting sleeves 41, a plurality of connecting rods 42, a rotating cover 43 and a plurality of locking members 44, wherein the connecting sleeves 41, the connecting rods 42 and the opening and closing pieces 22 correspond to each other one by one; the connecting sleeves 41 are integrally formed on the side wall of the corresponding opening and closing piece 22 away from the other opening and closing pieces 22, one end of the connecting rod 42 is inserted into the connecting sleeve 41 and connected to the inner wall of the connecting sleeve 41 by welding, and the other end of the connecting rod 42 is arranged in the direction of the clamping block 13; the clamping block 13 is penetrated along the thickness direction and is provided with a plurality of adjustment grooves 131 for the corresponding connecting rods 42 to pass through and slide. In this embodiment, the adjustment grooves 131 are waist-shaped grooves, and each waist-shaped groove is arranged along the diameter direction of the clamping block 13, and the peripheral wall of the connecting rod 42 is against the inner wall of the length direction of the adjustment groove 131.

[0048] Reference Figure 4 and Figure 5 The rotating cover 43 is sleeved on the outer wall of the connecting tube 14 and is rotatably connected to the connecting tube 14. The rotating cover 43 abuts against the end wall of the tightening block 13 that is away from the plug-in tube 12. The internal top wall of the rotating cover 43 is integrally formed with a plurality of first pushing blocks 431 and a plurality of second pushing blocks 432. The first pushing blocks 431, the second pushing blocks 432 and the connecting rod 42 are arranged one by one.

[0049] Reference Figure 4 and Figure 5 , a plurality of first pushing blocks 431 are integrally formed on the inner top wall of the opening of the rotating cover 43 near the connecting tube 14 and are evenly distributed along the circumferential direction of the connecting tube 14. In this embodiment, the distance of the outer wall of the first pushing block 431 away from the connecting sleeve 41 gradually increases from one end to the other end, and the whole is arc-shaped. When the rotating cover 43 rotates, the arc of the first pushing block 431 can make the connecting rod 42 slide along the length direction of the adjusting groove 131, so as to achieve the effect of moving the opening and closing piece 22 out of the gap between the fixed tube 21 and the needle tube 11; a plurality of second pushing blocks 432 are integrally formed on the inner circumferential wall of the rotating cover 43, and are evenly distributed along the circumferential direction of the inner circumferential wall of the rotating cover 43. The distance between the outer wall of the second pushing block 432 and the connecting tube 14 gradually increases from one end to the other end, so that the gap between the first pushing block 431 and the second pushing block 432 always maintains a spacing for the connecting rod 42 to pass through and slide, so as to improve the stability of the sliding rod when sliding.

[0050] Reference Figure 4 and Figure 5 An elastic member 5 is provided in the adjusting groove 131. In this embodiment, the elastic member 5 is a spring, which abuts against the inner wall of one end of the adjusting groove 131 in the length direction, so that the connection can be reset after the connecting rod 42 moves, thereby blocking the gap between the fixed tube 21 and the needle tube 11.

[0051] Reference Figure 4 and Figure 5The side walls of the connecting rod 42 facing the adjusting groove 131 in both length directions are provided with folding bellows 6 by welding, and the other end of the folding bellows 6 is connected to the inner wall of the adjusting groove 131 by welding. When the connecting rod 42 slides along the length direction of the adjusting groove 131, the folding bellows 6 on one side will be folded, while the folding bellows 6 on the other side will shrink, thereby sealing the adjusting groove 131 to reduce the probability of the liquid medicine penetrating into the rotating cover 43, thereby improving the sealing performance and operation safety.

[0052] Reference Figure 4 , a plurality of locking members 44 pass through the rotating cover 43 and are connected to the locking block 13. In this embodiment, the locking members 44 are screws, so that the adjusted rotating cover 43 can be locked to prevent the rotating cover 43 from sliding, resulting in an error between the state of the opening and closing piece 22 and the expected state.

[0053] The implementation principle of a filling needle in Example 2 of the present application is as follows: by providing a buffer tube 2 and a floating sheet 3, the syringe body 1 of the present application can contain part of the liquid medicine. When the filling machine stops running, part of the liquid medicine in the infusion tube of the filling machine will still enter the filling needle. The liquid medicine entering the syringe body 1 will temporarily enter the buffer tube 2 and the top of the floating sheet 3 until the floating sheet 3 is pressed down to the flow hole 112 to leak out. The liquid medicine can then enter the needle tube 11, thereby further reducing the probability of liquid medicine dripping, protecting the working environment around the filling machine and human health, and having high practicality and safety.

[0054] When the filling machine needs to fill a container with a larger volume of liquid medicine, the drive assembly 4 can be used to move the opening and closing pieces 22 in directions away from each other, so that the buffer tube 2 and the needle tube 11 are connected, thereby improving the filling efficiency of the liquid medicine.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A filling needle, comprising a syringe body (1), characterized in that: The syringe body (1) comprises a needle tube (11), a plug tube (12), a pressing block (13) and a connecting tube (14) which are connected in sequence; a planar liquid outlet (111) is provided at the opening of the needle tube (11); the plug tube (12) and the pressing block (13) are used to install the syringe body (1) and the filling machine; and the connecting tube (14) is used to connect the syringe body (1) and the infusion tube of the filling machine; A buffer tube (2) is provided on the inner wall of the connecting portion between the plug-in tube (12) and the abutting block (13); a liquid seepage hole (211) is provided on the side wall of the buffer tube (2) close to the abutting block (13); and the buffer tube (2) is connected to the plug-in tube (12) through the liquid seepage hole (211); The needle tube (11) is inserted into the plug tube (12) and abuts against the bottom wall of the buffer tube (2); the needle tube (11) and the opening of the plug tube (12) are connected by full welding; a floating sheet (3) is arranged in the plug tube (12); the floating sheet (3) is sleeved on the outer wall of the needle tube (11); a limiting rod (31) is arranged on the bottom wall of the plug tube (12); the limiting rod (31) passes through the floating sheet (3); a return spring (32) is arranged between the bottom wall of the plug tube (12) and the floating sheet (3); the return spring (32) is sleeved on the outer wall of the limiting rod (31); a flow hole (112) is opened on the outer wall of the needle tube (11) located between the floating sheet (3) and the bottom wall of the plug tube (12); A limiting plate (311) is provided at one end of the limiting rod (31) extending out of the floating plate (3); The buffer tube (2) comprises a fixed tube (21) and a plurality of opening and closing pieces (22). The fixed tube (21) abuts against the inner wall of the opening of the plug tube (12) near the abutting block (13). The plurality of opening and closing pieces (22) are arranged at one end of the fixed tube (21) near the needle tube (11). The plurality of opening and closing pieces (22) are spliced ​​with each other and abut against one end of the needle tube (11) inserted into the plug tube (12). A driving component (4) is arranged in the plug tube (12). The driving component (4) is used to drive the plurality of opening and closing pieces (22) to move in directions away from each other. After the plurality of opening and closing pieces (22) move away from each other, the fixed tube (21) is connected to the needle tube (11).

2. A filling needle according to claim 1, characterized in that: The driving assembly (4) comprises a plurality of connecting sleeves (41), a plurality of connecting rods (42), a rotating cover (43) and a plurality of locking members (44), wherein the connecting sleeves (41), the connecting rods (42) and the opening and closing pieces (22) correspond to each other one by one; the connecting sleeves (41) are arranged on the side wall of the corresponding opening and closing piece (22) away from the other opening and closing pieces (22), one end of the connecting rod (42) is inserted into the connecting sleeve (41), the connecting rod (42) is arranged vertically, the abutting block (13) is provided with an adjustment groove (131) through-and-through in the thickness direction for the connecting rod (42) to pass through and slide, the rotating cover (43) is rotatably connected to the outer wall of the connecting tube (14), and a plurality of first pushing blocks (431) are arranged on the inner wall of the opening of the rotating cover (43) which is in contact with the connecting sleeve (41). The first push block (431) and the connecting rod (42) correspond to each other one by one. The distance of the outer wall of the first push block (431) away from the connecting sleeve (41) gradually increases from one end to the other end. The inner wall of the rotating cover (43) is provided with a plurality of second push blocks (432) corresponding to the first push block (431). The distance of the outer wall of the second push block (432) from the connecting pipe (14) gradually increases from one end to the other end. The connecting rod (42) abuts between the corresponding first push block (431) and the second push block (432). When the rotating cover (43) rotates, the first push block (431) pushes the connecting rod (42) to slide along the length direction of the adjusting groove (131). The plurality of locking members (44) pass through the rotating cover (43) and are connected to the abutting block (13).

3. A filling needle according to claim 2, characterized in that: An elastic member (5) is disposed in the adjustment groove (131), and the elastic member (5) is used to drive the connecting rod (42) to move and then reset.

4. A filling needle according to claim 2, characterized in that: The side walls of the connecting rod (42) facing the adjusting groove (131) in both length directions are provided with folding bellows (6), the other end of the folding bellows (6) is connected to the inner wall of the adjusting groove (131), and the connecting rod (42) drives the folding bellows (6) to fold or expand when sliding along the adjusting groove (131).

5. A filling needle according to claim 1, characterized in that: The outer wall of the connecting pipe (14) is provided with an anti-slip protrusion (141).

6. A filling needle according to claim 1, characterized in that: The material of the syringe body (1) is titanium.

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