Pre-filling needle rod screwing device and pre-filling needle rod screwing torsion testing device

Abstract

The embodiment of the utility model provides a pre-filling needle rod screwing device and a pre-filling needle rod screwing torsion testing device, and the pre-filling needle rod screwing device comprises a push rod clamping assembly, a push rod limiting mechanism, a needle cylinder limiting assembly and an adjusting assembly which are sequentially arranged along a first direction, and a rotary rod screwing mechanism which is adjacent to the needle cylinder limiting assembly. The push rod clamping assembly comprises a clamping part and a driving part, and the driving part is connected with the clamping part and drives the clamping part to clamp and fix the push rod in the second direction; the needle cylinder limiting assembly comprises a limiting structure, and the needle cylinder limiting assembly is used for limiting a needle cylinder in the first direction through the limiting structure; the rotary rod screwing mechanism is used for driving the needle cylinder to rotate, and the adjusting assembly is used for changing the relative positions of the needle cylinder limiting assembly and the rotary rod screwing mechanism in the third direction. According to the embodiment, accurate positioning of the push rod limiting mechanism and the push rod is ensured when the pre-filling needle is assembled, the position deviation between the push rod limiting mechanism and the push rod is reduced, and the production efficiency is effectively improved.

Description

Pre-charged needle screwing device and pre-charged needle screwing torque testing device Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a pre-charged needle screwing rod device and a pre-charged needle screwing rod torque testing device. Background Technology

[0002] Pre-filled syringes, as a combination drug and medical device product, are widely used in biopharmaceuticals, vaccines, and other fields. Their core function is to deliver precise drug dosages via a single injection. In the pre-filled syringe manufacturing process, the assembly precision of the push rod is crucial; over-tightening and under-tightening must be avoided.

[0003] Existing pre-charged needle screwing devices, as described in CN106584081A, involve placing the threaded end of the push rod onto the threaded opening of an elastic rubber stopper inside the syringe, thus restricting the push rod's rotation. The syringe rotates a fixed number of turns under the action of a pre-torsion friction block, typically less than the number of turns required to fully screw into the bottom of the rubber stopper's thread. The pre-torsion friction block drives the syringe to rotate through friction, causing the push rod to enter the rubber stopper's thread. The length of the pre-torsion friction block determines the number of rotations of the syringe, typically set to leave an average of 0.5 turns of thread not fully engaged. The push rod's rotation continues to be restricted, and the syringe contacts a fine-torsion guide wheel. The fine-torsion guide wheel drives the syringe to continue rotating through a fixed torque, further engaging the push rod into the bottom of the rubber stopper's thread. When the resistance torque on the fine-torsion motor reaches the set maximum torque, the motor stops rotating, and the push rod is precisely installed in place.

[0004] The existing solution uses a pre-filled syringe mounted on a continuously rotating turntable. During the tightening process, the pre-filled syringe barrel fixed on the turntable needs to maintain contact with the fine-tightening wheel for a certain period to complete the tightening. The distance between the turntable fixing the pre-filled syringe and the fine-tightening wheel cannot be adjusted, making it difficult to meet the tightening requirements of pre-filled syringes of different sizes. Furthermore, if the turntable and the fine-tightening wheel are considered as two tangent circles, tightening can only occur at the intersection of the turntable and the fine-tightening wheel, resulting in a narrow tightening time window and a tendency to miss the tightening opportunity, leading to insufficient tightening. Summary of the Invention

[0005] Therefore, in order to overcome at least some of the defects and deficiencies in the prior art, this utility model provides a pre-charge needle screwing device and a pre-charge needle screwing torque testing device to ensure the precise alignment of the push rod limiting mechanism and the push rod during the pre-charge needle assembly process.

[0006] Specifically, in one aspect, the present invention provides a pre-charged needle screwing device, comprising: a push rod clamping assembly, a push rod limiting mechanism, a syringe limiting assembly, and an adjusting assembly arranged sequentially along a first direction, and a rotating screwing mechanism arranged adjacent to the syringe limiting assembly. The push rod clamping assembly includes a clamping part and a driving part, the driving part being connected to and driving the clamping part to clamp and fix the push rod in a second direction. The syringe limiting assembly includes a limiting structure, which limits the syringe in the first direction; the push rod limiting mechanism is connected to the driving part and is arranged opposite to the clamping part, limiting the push rod in the first direction. The rotating screwing mechanism drives the syringe to rotate, and the adjusting assembly changes the relative position of the syringe limiting assembly and the rotating screwing mechanism in a third direction.

[0007] In an embodiment of this utility model, the limiting structure includes a limiting plate and a limiting wheel. The limiting plate has a through hole extending along the first direction. The limiting plate limits the syringe along the first direction through the through hole. The limiting wheel and the rotating screw mechanism are used to limit the syringe in a second direction. The push rod limiting mechanism is disposed opposite to the through hole. The driving part rotates to drive the push rod limiting mechanism to move away from or towards the through hole.

[0008] In an embodiment of this utility model, the clamping part includes a first clamp and a second clamp, the first clamp and the second clamp being movably connected; the push rod clamping assembly includes a transmission assembly and a control handle, the driving part and the clamping part are respectively connected to both ends of the transmission assembly, and the clamping part is located at one end of the transmission assembly near the syringe limiting assembly; the control handle is fixedly connected to the driving part. The control handle is used to control the rotation of the driving part and drive the transmission assembly to rotate, thereby driving the first clamp and the second clamp to move in a direction away from or close to each other.

[0009] In an embodiment of this utility model, the transmission assembly includes a transmission rod, a driving gear, and a driven gear. The two ends of the transmission rod are respectively connected to the driving unit and the driving gear. The driving gear meshes with the driven gear. The driving gear is connected to the first gripper, and the driven gear is connected to the second gripper. The transmission rod rotates with the driving unit, causing the driving gear to rotate and the driven gear to rotate in the opposite direction. This causes the first gripper connected to the driving gear and the second gripper connected to the driven gear to open in a direction away from each other or close in a direction closer to each other.

[0010] In an embodiment of this utility model, the syringe limiting assembly includes an extension plate, which is located on the side of the limiting plate away from the push rod clamping assembly and is spaced apart from the limiting plate. The extension plate has an opening that is opposite to the through hole along the first direction. The limiting wheel includes two first limiting wheels and two second limiting wheels. The two first limiting wheels are respectively located on both sides of the through hole, and the two second limiting wheels are respectively located on both sides of the opening.

[0011] In an embodiment of this utility model, the syringe limiting assembly includes a fixing groove, which is located on the side of the extension plate away from the limiting plate. The opening of the fixing groove corresponds to the through hole, and the fixing groove is used to limit the end of the syringe.

[0012] In an embodiment of this utility model, the rotating screw mechanism is arranged adjacent to the limiting plate. The rotating screw mechanism includes a roller and a servo motor. The roller is connected to the output end of the servo motor. The roller is used to contact the outer wall of the syringe and drive the syringe to rotate under the drive of the servo motor.

[0013] On the other hand, the present invention provides a pre-charged needle screwing rod torque testing device, which includes the pre-charged needle screwing rod device and torque testing equipment as described in any of the preceding claims.

[0014] In an embodiment of this utility model, the pre-charged needle screw torque testing device further includes a slide table and an adjustment assembly. The syringe limiting assembly is slidably disposed on the slide table, and the adjustment assembly is connected to the syringe limiting assembly. The adjustment assembly includes an adjustment cylinder connected to the syringe limiting assembly, which drives the syringe limiting assembly to slide towards or away from the rotating screw mechanism. And / or, the adjustment assembly includes a manual adjustment rod connected to the syringe limiting assembly, which drives the syringe limiting assembly to slide towards or away from the rotating screw mechanism.

[0015] In an embodiment of this utility model, the torque testing device is connected to the output end of the servo motor and is located between the roller and the servo motor. The torque testing device is used to measure the torque value of the push rod screwing into the syringe when the roller drives the syringe to rotate.

[0016] As can be seen from the above, the technical features of this utility model can have one or more of the following beneficial effects:

[0017] 1. By integrating the push rod clamping assembly and the push rod limiting mechanism into a single structure, and with the push rod limiting mechanism positioned opposite the syringe limiting assembly when stationary, and the push rod corresponding to the push rod when the syringe is within the syringe limiting assembly, precise positioning of the push rod limiting mechanism and the push rod is ensured during pre-filled needle assembly. This reduces positional deviations between the push rod limiting mechanism and the push rod, effectively improving production efficiency. The step of adjusting the distance between the push rod limiting mechanism and the push rod is eliminated during pre-filled needle assembly, simplifying the assembly process and making it more efficient. Furthermore, the adjustable assembly allows for changing the relative position between the syringe limiting assembly and the rotating screw mechanism, enabling the screwing of push rods for pre-filled needles of different specifications on the same device without changing parts.

[0018] 2. This utility model provides a pre-charge needle screwing rod torque testing device. By setting a torque testing device within the rotating screwing rod mechanism, torque data during the screwing process can be acquired in real time. This allows for pre-testing of the pre-charge needle torque, determining the optimal torque parameters, and preventing product defects due to torque issues. Furthermore, different models of pre-charge needles can obtain accurate torque data on this testing device before being used in large-scale pre-charge needle production lines, effectively reducing the overall defect rate and improving product stability and consistency. Secondly, by setting an adjustment component to change the relative position between the syringe limit component and the rotating screwing rod mechanism, the screwing rod torque required for the push rods of different specifications of pre-charge needles can be tested on the same device without changing any parts. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a front structural schematic diagram of a pre-charged needle screw torque testing device provided in an embodiment of this utility model.

[0021] Figure 2 is a schematic diagram of the structure in Figure 1 with part of the shell removed.

[0022] Figure 3 is a front structural diagram of the syringe limiting assembly, push rod clamping assembly and adjustment assembly in Figure 1.

[0023] Figure 4 is a schematic diagram of the rotating lever mechanism in Figure 1.

[0024] Figure 5 is a side view of the syringe limiting assembly, push rod clamping assembly and adjustment assembly in Figure 1.

[0025] Figure 6 is a three-dimensional structural diagram of the syringe limiting assembly, push rod clamping assembly, adjustment assembly and rotating screw mechanism in Figure 1.

[0026] Figure 7 is a three-dimensional structural diagram of the syringe limiting assembly, push rod clamping assembly and adjustment assembly in Figure 1 from another perspective.

[0027] [Explanation of Key Figure Markings]

[0028] 1: Pre-charged needle screw torque testing device; 10: Syringe limiting assembly; 101: Limiting plate; 1011: Through hole; 103: Limiting wheel; 1031: First limiting wheel; 1032: Second limiting wheel; 104: Extension plate; 1041: Opening; 105: Fixing groove; 12: Push rod clamping assembly; 122: Clamping part; 1221: First gripper; 1223: Second gripper; 124: Control handle; 126: Drive part; 127: Transmission assembly; 1271: 1272: Drive gear; 1273: Driven gear; 13: Push rod limit mechanism; 14: Pressure regulating valve; 20: Adjustment component; 202: Adjustment cylinder; 204: Manual adjustment rod; 30: Rotary lever mechanism; 301: Roller; 302: Servo motor; 304: Torque testing equipment; 305: Bearing housing; 306: Reducer; 40: Slide table; 41: Housing; 42: Pressure gauge; 44: Emergency stop button; 45: Touch screen; 46: Start button. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] In this embodiment of the invention, the use of terms such as "first" and "second" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0031] On one hand, referring to FIG7, an embodiment of the present invention provides a pre-charged needle screwing device, comprising: a push rod clamping assembly 12, a push rod limiting mechanism 13, a syringe limiting assembly 10, and an adjusting assembly 20 arranged sequentially along a first direction, and a rotating screwing mechanism 30 arranged adjacent to the syringe limiting assembly 10. The push rod clamping assembly 12 includes a clamping part 122 and a driving part 126, the driving part 126 connecting to and driving the clamping part 122 to clamp and fix the push rod in a second direction. The syringe limiting assembly 10 includes a limiting structure, which limits the syringe in the first direction. The push rod limiting mechanism 13 is connected to the driving part 126, and the push rod limiting mechanism 13 is arranged opposite to the clamping part 122, limiting the push rod in the first direction. The rotating screwing mechanism 30 drives the syringe to rotate, and the adjusting assembly 20 changes the relative position of the syringe limiting assembly 10 and the rotating screwing mechanism 30 in a third direction.

[0032] Specifically, referring to Figure 3, the first direction is vertical, the second direction is horizontal, and the third direction is perpendicular to both the first and second directions. In the first direction, the syringe limiting assembly 10 is located below the clamping part 122. The limiting structure includes a limiting plate 101, which has a through hole 1011 extending along the first direction. The limiting plate 101 uses the through hole 1011 to limit the syringe along the first direction. The push rod limiting mechanism 13 is located above the clamping part 122 and corresponds to the push rod. The push rod limiting mechanism 13 can be, for example, a needle-type cylinder. The rotating screw mechanism 30 includes a roller 301, which is adjacent to the limiting plate 101 and in contact with the syringe. The roller 301 drives the syringe to rotate. The adjusting component 20 drives the syringe limiting component 10 to move away from or towards the rotating screw mechanism 30. The position between the syringe limiting component 10 and the rotating screw mechanism 30 can be adjusted according to different pre-filled needle specifications, ensuring that the roller 301 is in close contact with the outer wall of the syringe for better syringe rotation. The limiting structure includes a limiting wheel 103, which assists in syringe rotation. The limiting wheel 103 and the roller 301 limit the syringe in a second direction, preventing it from swaying during rotation. The driving unit 126 rotates, driving the push rod limiting mechanism 13 to move away from or towards the through hole 1011. When the driving unit 126 rotates, driving the push rod limiting mechanism 13 away from the through hole 1011, the clamping part 122 is in the open state, and the push rod limiting mechanism 13 is misaligned with the through hole 1011, facilitating the operator to insert or remove the syringe and push rod. When the drive unit 126 is stationary, the push rod limiting mechanism 13 is stationary and positioned opposite to the through hole 1011, the clamping unit 122 is in a clamping state, and the clamping unit 122 clamps the push rod. The push rod limiting mechanism 13 corresponds to the push rod. It should be noted that when the syringe is limited to the through hole 1011, the push rod portion is located inside the syringe.

[0033] Pre-fill needle tightening process: The control drive unit 126 rotates, causing the clamping part 122 to open. The push rod limiting mechanism 13 moves away from the clamping part 122 following the drive unit 126. At this time, the syringe with the push rod inserted at the top is placed in the through hole 1011 of the limiting plate 101. The limiting wheel 103 contacts the syringe and limits it in the second direction. When the drive unit 126 stops rotating, it is stationary. The clamping part 122 clamps and fixes the push rod. The push rod limiting mechanism 13 abuts against the push rod and limits it in the first direction. The adjusting component 20 drives the rotating tightening mechanism 30 to move towards the limiting plate 101 until the roller 301 is close to the syringe. The roller 301 is driven to rotate, thereby driving the syringe to rotate. The syringe rotates relative to the push rod, thereby screwing the push rod into the piston of the syringe, completing the tightening action of the pre-fill needle.

[0034] The push rod clamping assembly 12 is connected to the syringe limiting assembly 10 along a first direction, while the push rod limiting mechanism 13 is fixedly connected to the drive part 126 of the push rod clamping assembly 12, making the push rod limiting mechanism 13 an integral part of the push rod clamping assembly 12. When the drive part 126 is stationary, the clamping part 122 clamps the push rod, and the push rod limiting mechanism 13 precisely aligns with the push rod, entering the tightening state. When the syringe is limited to the through hole 1011 of the limiting plate 101, the push rod limiting mechanism 13 accurately aligns with the push rod, ensuring the coaxiality of the push rod and the syringe during assembly, greatly improving the assembly accuracy and reducing assembly errors caused by positioning deviations. At the same time, the integrated operation design reduces operation steps and avoids misalignment between the push rod limiting mechanism 13 and the push rod, reducing the professional skills required of operators and improving production efficiency. The clamping part 122 can be selected, for example, a quick-change clamping block, which can adapt to various sizes of pre-charge needles, avoiding the situation where traditional clamps need to be manually adjusted or frequently changed to fix the pre-charge needles according to different pre-charge needle specifications.

[0035] In an embodiment of this utility model, referring to Figures 6 and 7, the clamping part 122 includes a first clamping jaw 1221 and a second clamping jaw 1223, with the first clamping jaw 1221 and the second clamping jaw 1223 movably connected. The push rod clamping assembly 12 includes a transmission assembly 127 and a control handle 124. The driving part 126 and the clamping part 122 are respectively connected to both ends of the transmission assembly 127, and the clamping part 122 is located at one end of the transmission assembly 127 near the syringe limiting assembly 10. The control handle 124 is fixedly connected to the driving part 126. The control handle 124 is used to control the rotation of the driving part 126 and drive the transmission assembly 127 to rotate, thereby driving the first clamping jaw 1221 and the second clamping jaw 1223 to move in directions away from or close to each other. For example, the control handle 124 can be a waist-shaped handle. The operator can easily control the clamping and releasing action of the clamping part 122 on the pre-charge needle push rod by simply operating the control handle 124. The operation is simple and intuitive.

[0036] In an embodiment of this utility model, referring to Figures 6 and 7, the transmission assembly 127 includes a transmission rod 1271, a driving gear 1272, and a driven gear 1273. The two ends of the transmission rod 1271 are respectively connected to the driving unit 126 and the driving gear 1272. The driving gear 1272 meshes with the driven gear 1273. The driving gear 1272 is connected to the first gripper 1221, and the driven gear 1273 is connected to the second gripper 1223. The transmission rod 1271 rotates with the driving unit 126, causing the driving gear 1272 to rotate and the driven gear 1273 to rotate in the opposite direction. This causes the first gripper 1221 connected to the driving gear 1272 and the second gripper 1223 connected to the driven gear 1273 to open in a direction away from each other or close in a direction closer to each other. The drive gear 1272 and the driven gear 1273 mesh together to achieve synchronous and precise transmission, ensuring stable clamping action and maintaining the relative position of the push rod and the syringe.

[0037] In an embodiment of this utility model, referring to Figures 3 and 7, the syringe limiting assembly 10 includes an extension plate 104. The extension plate 104 is located on the side of the limiting plate 101 away from the push rod clamping assembly 12 and is spaced apart from the limiting plate 101. The extension plate 104 has an opening 1041 that is opposite to the through hole 1011 along the first direction. The limiting wheel 103 includes two first limiting wheels 1031 and two second limiting wheels 1032. The two first limiting wheels 1031 are respectively disposed on both sides of the through hole 1011, and the two second limiting wheels 1032 are respectively disposed on both sides of the opening 1041.

[0038] Specifically, the syringe barrel is positioned within the through hole 1011, with the extension plate 104 located in the middle. Two first limiting wheels 1031 fix the syringe barrel near the end of the push rod, and two second limiting wheels 1032 fix the middle position of the syringe barrel. The limiting wheels 103 and the limiting plate 101 limit the syringe barrel in the first and second directions, ensuring that the syringe barrel will not shift, shake, or tilt during the screw-on process. This provides a stable foundation for the accurate threaded connection between the push rod and the syringe barrel, improving the accuracy and quality of the pre-filled needle assembly. The distribution design of the limiting wheels 103 helps the syringe barrel remain stable during the screw-on process. When the screw-on mechanism 30 drives the syringe barrel to rotate, the first limiting wheels 1031 and the second limiting wheels 1032 assist the syringe barrel in rotating.

[0039] In an embodiment of this utility model, referring to FIG7, the syringe limiting assembly 10 includes a fixing groove 105. The fixing groove 105 is located on the side of the extension plate 104 away from the limiting plate 101. The opening of the fixing groove 105 corresponds to the through hole 1011. The fixing groove 105 is used to limit the end of the syringe. Specifically, when the roller 301 of the rotating lever mechanism 30 is close to the syringe and drives the syringe to rotate, the syringe will be subjected to a force exerted by the roller 301 away from the roller 301. The fixing groove 105 effectively resists and disperses the force, preventing the syringe from shifting or shaking in the direction away from the roller 301 during rotation. Secondly, the fixing groove 105 further limits the end of the syringe in the second direction. Combined with the aforementioned limiting of the end and middle of the syringe, it prevents the syringe from shifting, shaking or tilting during rotation in all directions, further improving the assembly accuracy and quality.

[0040] In an embodiment of this utility model, referring to FIG6, the rotating screw mechanism 30 is arranged adjacent to the limiting plate 101. The rotating screw mechanism 30 includes a roller 301 and a servo motor 302. The roller 301 is connected to the output end of the servo motor 302. The roller 301 is used to contact the outer wall of the syringe and drive the syringe to rotate under the drive of the servo motor 302. Specifically, the rotating screw mechanism 30 also includes a reducer 306 and a bearing seat 305. The reducer 306 is connected to the output end of the servo motor 302, and the bearing seat 305 is connected between the roller 301 and the reducer 306. Exemplarily, the roller 301 can be, for example, a silicone roller 301. The silicone roller 301 has good elasticity and friction, and can provide sufficient friction to drive the syringe to rotate when in contact with the outer wall of the syringe, while not damaging the surface of the syringe. The servo motor 302 is the power source of the rotating screw mechanism 30, and its specific model is not limited as long as it meets the usage requirements.

[0041] The reducer 306 reduces the speed of the servo motor 302 and amplifies the torque. During the tightening process, the reducer 306 adjusts the output torque according to the actual needs of different syringe and push rod specifications, ensuring that the roller 301 can drive the syringe to rotate with appropriate torque. This avoids damage to the syringe or push rod due to excessive torque, or incomplete tightening due to insufficient torque. Secondly, the reducer 306 reduces speed fluctuations in the motor output, making the rotation of the roller 301 more stable. This ensures that the syringe is evenly stressed during tightening, avoiding assembly errors caused by unstable power transmission. The bearing housing 305 connects the roller 301 and the reducer 306, providing support and positioning. It reduces axial and radial runout of the roller 301 during rotation, and reduces friction and wear between the roller 301 and other components.

[0042] On the other hand, referring to Figures 4 and 6, the present invention provides a pre-charged needle screwing rod torque testing device 1, which includes the pre-charged needle screwing rod device described in any of the preceding claims and a torque testing device 304. The pre-charged needle screwing rod torque testing device 1 provided in this embodiment integrates the pre-charged needle screwing rod device and the torque testing device 304. During the screwing process, the torque testing device 304 can monitor and feedback torque data in real time. Before production, this device can quickly determine suitable screwing rod torque parameters, enabling precise equipment debugging before production begins and reducing product defects caused by torque issues during large-scale production. For example, the torque testing device 304 can be selected from torque sensors, which have high measurement accuracy and resolution, can accurately detect minute torque changes, monitor torque changes in real time, and promptly feed the measurement data back to the control system.

[0043] In an embodiment of this utility model, referring to Figures 3 and 5, the pre-charged needle screw torque testing device 1 further includes a slide table 40 and an adjustment component 20. The syringe limiting component 10 is slidably disposed on the slide table 40, and the adjustment component 20 is connected to the syringe limiting component 10. The adjustment component 20 includes an adjustment cylinder 202, which is connected to the syringe limiting component 10 and is used to drive the syringe limiting component 10 to slide towards or away from the rotating screw mechanism 30. The adjustment component 20 also includes a manual adjustment rod 204, which is connected to the syringe limiting component 10 and is used to drive the syringe limiting component 10 to slide towards or away from the rotating screw mechanism 30.

[0044] Specifically, the syringe limiting component 10 can slide upwards via the slide table 40, and the adjusting cylinder 202 and the manual adjusting rod 204 can drive it closer to or further away from the rotating lever mechanism 30, allowing for flexible adjustment of the syringe limiting component 10's position according to parameters such as the length and diameter of syringes of different specifications. The adjusting cylinder 202 automates the adjustment of the syringe limiting component 10's position. During production, operators can pre-set the operating parameters of the adjusting cylinder 202 according to the production task, enabling the cylinder 202 to quickly and accurately adjust the syringe limiting component 10 to the appropriate position. The manual adjusting rod 204 allows for fine-tuning of the syringe position to achieve optimal lever tightening effect, or precise position calibration during equipment debugging to achieve more accurate operation.

[0045] In an embodiment of this utility model, referring to FIG4, the torque testing device 304 is connected to the output end of the servo motor 302 and is located between the roller 301 and the servo motor 302. The torque testing device 304 is used to measure the torque value of the push rod screwing into the syringe when the roller 301 drives the syringe to rotate. Specifically, the torque testing device 304 is located on the power output shaft, which can minimize the measurement error caused by mechanical loss and transmission clearance in the intermediate links, and can more accurately reflect the actual torque value when the push rod is screwed into the syringe.

[0046] Additionally, referring to Figures 1 and 2, the pre-charged needle screwing rod torque testing device 1 has an outer shell 41 constructed from aluminum alloy material. An electrical control system is installed inside to control the device's operating logic and coordinate the work of various components. A start button 46 and an emergency stop button 44 are installed on the outer cover to control the device's start and stop, allowing operators to easily turn the device on or off as needed, ensuring safe operation. A touch screen 45 is installed on the outer cover, providing real-time feedback of the torque value detected by the torque testing device 304. A pressure gauge 42 and a pressure regulating valve 14 are also provided on the outer cover. The pressure regulating valve 14 adjusts the downward pressure of the push rod limiting mechanism 13, and the pressure gauge 42 displays the current pressure value of the push rod limiting mechanism 13. Adjusting the pressure value of the push rod limiting mechanism 13 allows for better limiting of the push rod in the first direction during screwing.

[0047] In summary, the testing process of the pre-charge needle screwing rod torque testing device 1 is as follows: Manually operating the control handle 124 causes the drive unit 126 to rotate. The push rod limiting mechanism 13 moves away from the through hole 1011 along with the drive unit 126. The rotation of the drive unit 126 opens the clamping part 122, placing the syringe with the push rod inserted at the top into the through hole 1011 of the limiting plate 101, with the limiting wheel 103 contacting the outer wall of the syringe. Releasing the control handle 124 returns the drive unit 126 to a stationary state. The clamping part 122 clamps and fixes the push rod, and the push rod limiting mechanism 13 abuts against the push rod, limiting it in the first direction. The adjusting component 20 drives the rotating screwing rod mechanism 30 to move towards the limiting plate 101 until the roller 301 is in close contact with the outer wall of the syringe. The servo motor 302 drives the roller 301 to rotate, thereby causing the syringe to rotate relative to the push rod, thus screwing the push rod into the piston of the syringe, completing the screwing action of the pre-charge needle. The torque testing device 304 connected to the servo motor 302 displays the tested torque data on the touch screen 45. After completing the screwing action, the control handle 124 is operated again to rotate the drive unit 126, the clamping part 122 opens and the product is removed. The insertion of the push rod into the rubber stopper inside the syringe is observed. If the push rod does not enter the rubber stopper, it is judged as under-tightening. If the push rod enters the rubber stopper but the rubber stopper is deformed, it is judged as over-tightening. If the push rod enters the rubber stopper and the rubber stopper is not deformed, it is normal, indicating that the current torque is optimal. It is worth mentioning that the insertion of the push rod into the rubber stopper can be observed by the naked eye or visual inspection equipment.

[0048] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of this utility model. Provided that the technical features do not conflict, the structure is not contradictory, and the purpose of this utility model is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pre-charged needle screwing device, characterized in that, include: The push rod clamping assembly (12), push rod limiting mechanism (13), syringe limiting assembly (10), and adjusting assembly (20) are arranged sequentially along a first direction, and a rotating screw mechanism (30) is arranged adjacent to the syringe limiting assembly (10); the push rod clamping assembly (12) includes a clamping part (122) and a driving part (126), the driving part (126) is connected to and drives the clamping part (122) to clamp and fix the push rod in a second direction; the syringe limiting assembly (10) includes a limiting structure, the syringe limiting assembly (10) The limiting structure is used to limit the syringe in the first direction; the push rod limiting mechanism (13) is connected to the driving part (126), and the push rod limiting mechanism (13) is arranged opposite to the clamping part (122). The push rod limiting mechanism (13) is used to limit the push rod in the first direction; the rotating screw mechanism (30) is used to drive the syringe to rotate, and the adjusting component (20) is used to change the relative position of the syringe limiting component (10) and the rotating screw mechanism (30) in the third direction.

2. The pre-charge needle screwing device according to claim 1, characterized in that, The limiting structure includes a limiting plate (101) and a limiting wheel (103). The limiting plate (101) has a through hole (1011) extending along the first direction. The limiting plate (101) limits the syringe along the first direction through the through hole (1011). The limiting wheel (103) and the rotating screw mechanism (30) are used to limit the syringe in the second direction. The push rod limiting mechanism (13) is arranged opposite to the through hole (1011). The driving part (126) rotates and drives the push rod limiting mechanism (13) to move away from or towards the through hole (1011).

3. The pre-charged needle screwing device according to claim 1, characterized in that, The clamping part (122) includes a first clamping jaw (1221) and a second clamping jaw (1223), the first clamping jaw (1221) and the second clamping jaw (1223) being movably connected; the push rod clamping assembly (12) includes a transmission assembly (127) and a control handle (124), the driving part (126) and the clamping part (122) are respectively connected to both ends of the transmission assembly (127), and the clamping part (122) is located at one end of the transmission assembly (127) near the syringe limiting assembly (10), the control handle (124) is fixedly connected to the driving part (126); the control handle (124) is used to control the driving part (126) to rotate and drive the transmission assembly (127) to rotate so as to drive the first clamping jaw (1221) and the second clamping jaw (1223) to move in a direction away from or close to each other.

4. The pre-charged needle screwing device according to claim 3, characterized in that, The transmission assembly (127) includes a transmission rod (1271), a drive gear (1272), and a driven gear (1273). The two ends of the transmission rod (1271) are respectively connected to the drive unit (126) and the drive gear (1272). The drive gear (1272) meshes with the driven gear (1273). The drive gear (1272) is connected to the first gripper (1221), and the driven gear (1273) is connected to the second gripper (1223). The transmission rod (1271) rotates with the drive unit (126) and drives the drive gear (1272) to rotate and the driven gear (1273) to rotate in the opposite direction, so that the first gripper (1221) connected to the drive gear (1272) and the second gripper (1223) connected to the driven gear (1273) open in a direction away from each other or close in a direction close to each other.

5. The pre-charge needle screwing device according to claim 2, characterized in that, The syringe limiting assembly (10) includes an extension plate (104), which is located on the side of the limiting plate (101) away from the push rod clamping assembly (12) and is spaced apart from the limiting plate (101). The extension plate (104) has an opening (1041) that is opposite to the through hole (1011) along the first direction. The limiting wheel (103) includes two first limiting wheels (1031) and two second limiting wheels (1032). The two first limiting wheels (1031) are respectively located on both sides of the through hole (1011), and the two second limiting wheels (1032) are respectively located on both sides of the opening (1041).

6. The pre-charge needle screwing device according to claim 5, characterized in that, The syringe limiting assembly (10) includes a fixing groove (105), which is located on the side of the extension plate (104) away from the limiting plate (101). The opening of the fixing groove (105) corresponds to the through hole (1011), and the fixing groove (105) is used to limit the end of the syringe.

7. The pre-charge needle screwing device according to claim 2, characterized in that, The rotating screw mechanism (30) is arranged adjacent to the limiting plate (101). The rotating screw mechanism (30) includes a roller (301) and a servo motor (302). The roller (301) is connected to the output end of the servo motor (302). The roller (301) is used to contact the outer wall of the syringe and drive the syringe to rotate under the drive of the servo motor (302).

8. A pre-charged needle screw torque testing device (1), characterized in that, Includes the pre-charged needle screwing device and the torque testing equipment (304) according to any one of claims 1 to 7.

9. The pre-charged needle screw torque testing device (1) according to claim 8, characterized in that, It also includes a slide (40), on which the syringe limiting assembly (10) is slidably disposed, and the adjusting assembly (20) is connected to the syringe limiting assembly (10); the adjusting assembly (20) includes an adjusting cylinder (202), which is connected to the syringe limiting assembly (10), and the adjusting cylinder (202) is used to drive the syringe limiting assembly (10) to slide toward or away from the rotating lever mechanism (30); and / or, the adjusting assembly (20) includes a manual adjusting rod (204), which is connected to the syringe limiting assembly (10), and the manual adjusting rod (204) is used to drive the syringe limiting assembly (10) to slide toward or away from the rotating lever mechanism (30).

10. The pre-charged needle screw torque testing device (1) according to claim 8, characterized in that, The torque testing device (304) is connected to the output end of the servo motor (302) and is located between the roller (301) and the servo motor (302). The torque testing device (304) is used to measure the torque value of the push rod screwing into the syringe when the roller (301) drives the syringe to rotate.

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