A reliability testing device for a medical insert-molded needle assembly

Abstract

The present application relates to injection molding needle assembly detection technical field, especially in medical insert injection molding needle assembly reliability detection device, including detection machine case and base plate, the bottom of base plate is movably provided with U type movement frame, U type movement frame is provided with rotating wiping assembly, is used for the rotational cleaning from top to bottom to the release agent and impurities of needle seat periphery, rotating wiping assembly includes support rotating rod, rotating gear and arc cleaning plate;Through the rotating wiping assembly, the agent liquid spraying assembly, the surrounding locking assembly and the unified integration of the lower pressure driving assembly on the U type movement frame, the four groups of action sequence linkage of the rotating cleaning, the synchronous liquid supply, the axial end face compression and the four jaw centering clamping are driven by a lower pressure stroke, the high unification of cleaning, locking and test working condition is realized, the interference of the test result caused by the clamping interface pollution and the clamping looseness is eliminated, and the detection precision and the consistency of batch data are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding needle assembly detection, in particular to a reliability detection apparatus for a medical insert injection molding needle assembly. Background Art

[0002] In the production of medical insert injection molding needle assemblies, the bonding strength between the needle tube and the needle hub is a core indicator for measuring product reliability. The assembly integrates the metal needle tube and the plastic needle hub through an insert injection molding process, so strict torsion tests must be performed on each batch of products before delivery.

[0003] When conventional detection apparatuses clamp the needle hub, the fundamental influence of the surface state of the outer wall of the needle hub on the clamping effect is generally neglected. Release agents remaining on the needle hub during injection molding, and impurities such as dust and sweat adsorbed during subsequent transfer, will form an uncontrollable lubricating medium layer between the clamping bite surface of the fixture and the outer wall of the needle hub. When a torsion torque is applied, this layer of lubricating medium significantly reduces the static friction between the fixture and the needle hub, causing the needle hub itself to slide slightly within the fixture, and the force value collected by the torque sensor is actually the slipping friction force rather than the true torsional strength at the joint between the needle tube and the needle hub. Such data distortion caused by contamination of the clamping interface will misjudge unqualified products as qualified products, resulting in serious safety hazards.

[0004] Meanwhile, existing detection apparatuses adopt simple pneumatic clamping jaws or manual locking mechanisms, and lack an automatic centering function, which easily causes the needle hub to deflect or be unevenly stressed during clamping, resulting in the deviation of the torsion torque transmission path from the axis, and the test data cannot reflect the true bonding strength under pure torsion conditions. In addition, the cleaning process and the testing process are usually separated, fluctuations in cleaning quality lead to different surface states when each needle hub is tested, and the dispersion of batch detection data is extremely large, so a reliable product acceptance standard cannot be established, which reduces the detection effect of insert injection molding needle assemblies. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a reliability detection apparatus for a medical insert injection molding needle assembly.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: A reliability detection apparatus for a medical insert injection molding needle assembly, comprising a detection chassis, a torque meter for performing a torsion test on the insert injection molding needle assembly arranged at the inner top of the detection chassis, a base plate for carrying the injection molding needle fixedly installed inside the detection chassis, a U-shaped moving frame movably arranged at the bottom of the base plate, and a rotating wiping assembly arranged on the U-shaped moving frame, which is used for rotating and cleaning release agents and impurities on the outer circumference of the needle hub from top to bottom, the rotating wiping assembly comprising a supporting rotating rod, a rotating gear and an arc-shaped cleaning plate. The support rod is also equipped with a liquid spraying assembly for spraying cleaning solvent onto the wiping cloth on the arc-shaped cleaning plate. The liquid spraying assembly includes a rotating cylinder and a liquid cylinder. During the process of the arc-shaped cleaning plate rotating and cleaning the surface of the needle seat, the liquid cylinder delivers cleaning liquid to the wiping cloth. The top of the U-shaped motion frame is equipped with a surrounding locking assembly, which is used to lock the needle seat around the top of the base plate. The surrounding locking assembly includes an arc-shaped locking plate and a fixing ring. Four arc-shaped locking plates converge from the outer periphery of the needle seat towards its center, tightly surrounding the needle seat. The base plate has a base frame at the bottom, and the base frame has a downward drive component inside, which drives the U-shaped motion frame to descend from above the needle holder. During the descent, the arc-shaped cleaning plate is driven to rotate and clean the needle holder, and the driving agent cylinder sprays cleaning agent liquid onto the wiping cloth. After descending to the bottom, the fixing ring presses and locks the top of the needle holder.

[0007] As a preferred embodiment of the present invention, a torque meter is provided inside the detection chassis at the center above the base plate. The torque meter clamps and twists the needle of the insert injection molding needle. The rotating wiping assembly also includes a rack plate. Arc-shaped support plates are fixedly installed at both ends of the top of the base frame. A rack plate is fixedly installed on the top of the arc-shaped support plate. Support rods are movably connected to both ends of the U-shaped motion frame through bearings. An arc-shaped cleaning plate is fixedly installed at one end of each support rod. Wiping cloths are provided at both ends of the arc-shaped cleaning plate near the needle seat for wiping the outer periphery of the needle seat.

[0008] Rotary gears are fixedly installed on the support rod, and the rotating gears are engaged with the rack plate for transmission.

[0009] As a preferred embodiment of the present invention, the liquid spraying assembly further includes a push rod. A side frame is fixedly installed on the side of the U-shaped motion frame away from the arc-shaped cleaning plate, and the side frame is located at the top of the rotating gear. A rotating cylinder is movably connected to the bottom of each side frame via a bearing. A supporting rotating rod is fixedly installed at the center of the rotating cylinder at the end away from the arc-shaped cleaning plate. A liquid cylinder is fixedly installed on the side frame at the end away from the arc-shaped cleaning plate. A push rod is movably mounted on the side frame, and a T-shaped drive rod is fixedly installed on the push rod. An annular drive groove is formed on the outer periphery of the rotating cylinder, the size of which matches the T-shaped drive rod, and the T-shaped drive rod moves within the annular drive groove.

[0010] The arc-shaped cleaning plate has a spray seat fixedly installed at the center of the side near the needle seat. Several spray heads for spraying solvent onto the wiping cloth are fixedly installed on both sides of the spray seat. A piston plate is movably installed inside the liquid cylinder. A push rod passes through the liquid cylinder and is fixedly connected to the piston plate. An outlet pipe and an inlet pipe are fixedly installed at the end of the liquid cylinder away from the rotating cylinder. The inlet pipe is connected to an external cleaning tank for storing alcohol, and the outlet pipe is connected to the spray seat. Both the outlet pipe and the inlet pipe are equipped with one-way valves.

[0011] As a preferred embodiment of the present invention, the surrounding locking assembly further includes an arc-shaped movable plate and a pulling plate. An annular connecting frame is fixedly installed on the top of the U-shaped moving frame. A fixed ring is fixedly installed at the bottom center of the annular connecting frame. Four arc-shaped movable plates are movably connected around the top of the fixed ring via a rotating shaft. An arc-shaped locking plate is fixedly installed on the end of the arc-shaped movable plate away from the fixed ring. A locking tooth seat is fixedly installed on the side of the arc-shaped locking plate near the needle seat.

[0012] A motor cover is fixedly installed on the top of the annular connecting frame. A servo motor is fixedly installed inside the motor cover. The output end of the servo motor is driven by a rotating shaft to connect to a rotating gear. An annular groove is opened at the bottom of the annular connecting frame. An annular slider is slidably connected in the annular groove. A rotating gear is fixedly installed at the bottom of the annular slider. The rotating gear and the rotating gear are engaged in transmission. A pull plate is movably connected to the top of the arc-shaped movable plate. The pull plate is movably connected to the bottom of the rotating gear at the end away from the fixed ring.

[0013] As a preferred embodiment of the present invention, the downward driving component includes a stepper motor, which is fixedly installed at the center of the inner bottom of the base frame by bolts. A screw is fixedly installed at the output end of the stepper motor, and a lifting plate is threaded through the screw. The lifting plate is fixedly connected to the U-shaped motion frame. A limit rod is fixedly installed inside the base frame, and both ends of the lifting plate are movably inserted through the limit rod.

[0014] Compared with the prior art, the beneficial effects that this invention can achieve are: 1. In this invention, the integrated layout of the pressure drive component, the rotating wiping component, the liquid spraying component, and the surrounding locking component on the same U-shaped motion frame, along with their sequential linkage during the descent stroke, achieves seamless automation of the entire process from needle seat surface cleaning, solvent wetting, radial circumferential locking, to axial end face pressing. The entire device uses a single pressure stroke as the time axis, sequentially completing four steps: rotating wiping to remove contaminants, synchronously spraying solvent to dissolve residues, four-jaw convergence and alignment, and fixing ring end face pressing and locking. The transition between each step requires no additional waiting time or intermediate transfer links. This highly integrated automated process not only minimizes the auxiliary time of a single detection cycle but also ensures strict sequence and precise coordination between steps through mechanical linkage. This ensures that each needle assembly is in the exact same surface state and clamping conditions when undergoing torque testing, minimizing the interference of human factors and process fluctuations on the detection results at the process level, and comprehensively improving detection efficiency, detection accuracy, and the confidence of result judgment.

[0015] 2. In this invention, the downward linear motion of the U-shaped motion frame is precisely converted into the rotational motion of the supporting rotating rod by the meshing transmission of the rotating gear and the rack plate in the rotating wiping assembly. This drives the arc-shaped cleaning plate and the wiping cloth on its inner side to perform a spiral rotation wiping from top to bottom against the outer periphery of the needle seat, realizing a pure mechanical linkage between the cleaning action and the downward stroke. This design does not require a separate motor or pneumatic component for the cleaning station. It automatically generates the rotational torque required for wiping using only the downward stroke. While the structure is highly simplified, the wiping trajectory is evenly distributed in a spiral, ensuring that every area of ​​the circumference of the needle seat is fully contacted and cleaned, eliminating wiping omissions or excessive friction, and achieving 100% cleaning coverage, providing a clean surface without dead angles for subsequent clamping.

[0016] 3. In this invention, the rotational motion of the supporting rotating rod is converted into the linear reciprocating motion of the pushing rod by the cooperation of the annular drive groove on the outer periphery of the rotating cylinder in the solvent spraying assembly and the T-shaped drive rod. This drives the piston plate in the solvent cylinder to perform the discharge and suction strokes, realizing a quantitative pulsed supply of cleaning solvent to the wiping cloth. The rhythm of solvent spraying and wiping rotation is strictly locked on the same power chain, so that the wiping cloth is wetted with fresh solvent the moment it contacts the needle seat surface. The solvent supply and wiping speed maintain a fixed proportional relationship, which not only ensures the efficient dissolution and encapsulation of release agent and impurities, but also avoids waste and splashing caused by excessive solvent. The best wetting wiping effect is achieved with minimal solvent consumption, ensuring the consistency and controllability of cleaning quality.

[0017] 4. In this invention, by sharing the same supporting rotating rod as the power source between the rotating gear and rack plate of the rotating wiping assembly and the annular drive groove and piston plate of the solvent spraying assembly, precise mechanical synchronization of the two sets of actions—wiping and cleaning, and solvent supply—is achieved. A fixed correspondence is formed between the rotational wiping speed and the solvent pumping frequency through the curved shape of the annular drive groove on the rotating cylinder. Every time the wiping cloth rotates a certain angle, the piston plate completes a quantitative solvent delivery, ensuring that the wiping cloth maintains a uniform and stable level of wetness throughout the cleaning process. This linkage mechanism eliminates fluctuations in cleaning effect caused by delayed or excessive solvent supply, keeps the release agent removal rate on the needle seat surface highly consistent, establishes identical surface friction conditions for each workpiece to be inspected, and further improves the stability and reliability of batch inspection data.

[0018] 5. In this invention, the servo motor in the surrounding locking assembly drives the rotating gear to mesh with the rotating gear disk. The pulling plate pulls the four arc-shaped movable plates to swing synchronously around the fixed ring, causing the four arc-shaped locking plates to converge evenly from the outer periphery of the needle holder towards its center, achieving synchronous centering and clamping of the four claws. At the same time, the fixed ring is vertically pressed against the top end face of the needle holder as the U-shaped motion frame descends, working together with the radial embedding and biting of the locking gear on the inner side of the arc-shaped locking plate to completely eliminate any degree of freedom of movement of the needle holder in both radial and axial dimensions. This dual locking mechanism ensures that the torsional torque applied by the torque meter can be transmitted to the insert joint interface between the needle tube and the needle holder without loss, fundamentally eliminating the attenuation of test force and directional deviation caused by loose or misaligned needle holder clamping. This ensures that the data recorded by the torque sensor truly reflects the connection strength of the product, greatly improving the accuracy and reliability of the test results.

[0019] 6. In this invention, the stepper motor in the downward drive assembly drives the screw to rotate, causing the lifting plate to move precisely vertically along the limit rod, thereby driving the U-shaped motion frame to descend smoothly from above the needle seat. This transforms the rotational motion of a single power source into a unified stroke reference for three functional modules: cleaning, liquid supply, and locking. This integrated drive architecture ensures that the action rhythm, descent speed, and stroke endpoint are completely consistent for each testing cycle, fundamentally eliminating the timing deviations and asynchronous actions that may be caused by multi-power source time-sharing control. It ensures that the preprocessing conditions for each test are highly consistent, providing a solid mechanical guarantee for the repeatability and comparability of torque test data, and significantly improving the consistency of batch testing results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the testing chassis of the present invention; Figure 3 This is a schematic diagram of the U-shaped motion frame of the present invention; Figure 4 This is a schematic diagram of the side frame structure of the present invention; Figure 5 This is a schematic diagram of the base frame of the present invention; Figure 6 This is a schematic diagram of the arc-shaped cleaning plate of the present invention; Figure 7 This is a schematic diagram of the structure of the liquid cylinder of the present invention; Figure 8 This is a schematic diagram of the structure of the annular connecting frame of the present invention; Figure 9 This is a schematic diagram of the structure of the fixing ring of the present invention.

[0021] The components include: 10. Testing chassis; 11. Torque meter; 12. Base frame; 13. Stepper motor; 14. Screw; 15. Lifting plate; 16. Limiting rod; 17. Base plate; 20. U-shaped motion frame; 21. Arc-shaped support plate; 22. Rack plate; 23. Support rotating rod; 24. Arc-shaped cleaning plate; 25. Wiping cloth; 26. Rotary gear; 27. Sprayer seat; 28. Spray head; 30. Side frame; 31. Rotating cylinder. 32. Push rod; 33. T-shaped drive rod; 34. Annular drive groove; 35. Liquid cylinder; 36. Liquid outlet pipe; 37. Liquid inlet pipe; 38. Piston plate; 40. Annular connecting frame; 41. Fixed ring; 42. Arc-shaped movable plate; 43. Pulling plate; 44. Rotating gear; 45. Arc-shaped locking plate; 46. Locking gear seat; 47. Annular slide groove; 48. Annular slider; 50. Servo motor; 51. Rotating gear. Detailed Implementation

[0022] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0023] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, a reliability testing device for medical insert injection molded needle assemblies includes a testing housing 10. A torque meter 11 for performing torsion tests on the insert injection molded needle assembly is installed on the top inner surface of the testing housing 10. A base plate 17 for supporting the injection molded needle is fixedly installed inside the testing housing 10. A U-shaped motion frame 20 is movably mounted on the bottom of the base plate 17. A rotating wiping assembly is mounted on the U-shaped motion frame 20 for rotating and cleaning the mold release agent and impurities on the outer periphery of the needle holder from top to bottom. The rotating wiping assembly includes a supporting rotating rod 23, a rotating gear 26, and an arc-shaped cleaning plate 24. The cleaning plate 24 is located at the center above the base plate 17 inside the testing housing 10. A torque meter 11 is provided to clamp and twist the needle of the insert injection molding needle. The rotating wiping assembly also includes a rack plate 22. Arc-shaped support plates 21 are fixedly installed at both ends of the top of the base frame 12. The rack plate 22 is fixedly installed on the top of the arc-shaped support plate 21. The two ends of the U-shaped motion frame 20 are movably connected to the support rods 23 through bearings. Arc-shaped cleaning plates 24 are fixedly installed at one end of each support rod 23. Wiping cloths 25 are provided at both ends of the arc-shaped cleaning plates 24 near the needle seat for wiping the outer periphery of the needle seat. Rotary gears 26 are fixedly installed on the support rods 23. The rotary gears 26 are all meshed with the rack plate 22.

[0024] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 During its downward movement, the U-shaped motion frame 20 cleverly transforms linear travel into a rotational cleaning motion. As the U-shaped motion frame 20 begins to descend under the drive of the downward pressure component, the support rods 23 fixed at both ends of the U-shaped motion frame 20 and their rotating gears 26 also move downward synchronously. Since the rack plate 22 at the top of the arc-shaped support plate 21 remains stationary, the rotating gear 26 is forced to mesh with the tooth surface of the rack plate 22 during its downward movement. This gear and rack engagement forces the rotating gear 26 to generate rotational motion around its own axis while moving downward, thereby driving the support rods 23 to rotate synchronously. Thus, the downward linear motion of the U-shaped motion frame 20 is precisely transformed into the rotational motion of the support rods 23, providing the rotational torque required for cleaning the arc-shaped cleaning plate 24. The entire process requires no additional independent drive source, achieving a high degree of structural integration.

[0025] The rotation of the support rod 23 directly drives the arc-shaped cleaning plate 24 to perform the wiping cleaning task. The arc-shaped cleaning plate 24 is fixedly installed at the end of the support rod 23. When the support rod 23 rotates, the arc-shaped cleaning plate 24 rotates around the axis of the support rod 23. Since the inner side of the arc-shaped cleaning plate 24 is in close contact with the outer peripheral surface of the needle holder, the wiping cloths 25 at both ends form a gentle wrapping wiping of the needle holder during rotation. As the arc-shaped cleaning plate 24 rotates, the wiping cloths 25 spirally advance from the top to the bottom of the outer peripheral surface of the needle holder, peeling off and absorbing the injection molding release agent, dust and impurities attached to the surface of the needle holder layer by layer. The core purpose of this cleaning action is to thoroughly remove residual contaminants from the outer surface of the needle hub, providing a clean contact interface for the subsequent clamping of the surrounding locking assembly. If the release agent is not removed, it will form a very thin lubricating film between the arc-shaped locking plate 45 and the needle hub. When the torque meter 11 applies a torsional torque to the needle tube, the needle hub itself may experience micro-slippage within the clamp, causing the torque sensor to measure the frictional force of the clamp slippage, rather than the actual torsional strength of the needle tube and the needle hub insert. Rotary wiping completely eliminates this source of interference through physical means, ensuring the stability of subsequent clamping.

[0026] The rotational speed of the arc-shaped cleaning plate 24 and the descent speed of the U-shaped motion frame 20 are connected by a fixed transmission ratio formed by the gear ratio of the rotating gear 26 and the rack plate 22. This ensures that the wiping trajectory of the wiping cloth 25 on the needle holder surface is a uniform spiral distribution, preventing any missed or excessively overlapping areas. As the U-shaped motion frame 20 descends to the end of its stroke, the arc-shaped cleaning plate 24 also completes a full wiping cycle of the entire outer circumference of the needle holder, ending the cleaning action and the descent stroke simultaneously. This purely mechanical linkage method not only ensures the consistency and repeatability of each cleaning action, but also... More importantly, it establishes an identical surface condition benchmark for each needle holder; when the arc-shaped locking plate 45 surrounding the locking assembly closes and tightens, the locking tooth 46 directly bites into the clean needle holder plastic body, forming a reliable mechanical lock; in the subsequent torsion test, the torque applied by the torque meter 11 will be transmitted to the interface between the needle tube and the needle holder without loss, and the recorded data truly reflects the connection strength of the insert injection molding, without data deviation due to contamination of the clamping interface; the more thorough the cleaning, the more stable the clamping, and the more accurately the test results reflect the quality level of the product.

[0027] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The support rod 23 is also equipped with a liquid spraying assembly for spraying cleaning solvent onto the wiping cloth 25 on the arc-shaped cleaning plate 24. The liquid spraying assembly includes a rotating cylinder 31 and a liquid cylinder 35. During the process of the arc-shaped cleaning plate 24 rotating and cleaning the needle seat surface, the liquid cylinder 35 delivers cleaning liquid to the wiping cloth 25. The liquid spraying assembly also includes a push rod 32. The U-shaped motion frame 20 has side frames 30 fixedly installed on the side away from the arc-shaped cleaning plate 24, and the side frames 30 are located at the top of the rotating gear 26, with the bottom of the side frames 30... All are movably connected to a rotating cylinder 31 via bearings. A supporting rotating rod 23 is fixedly installed at the center of the rotating cylinder 31 at the end away from the arc-shaped cleaning plate 24. A liquid cylinder 35 is fixedly installed at the end of the side frame 30 away from the arc-shaped cleaning plate 24. A push rod 32 is movably arranged on the side frame 30. A T-shaped drive rod 33 is fixedly installed on the push rod 32. An annular drive groove 34 is opened on the outer periphery of the rotating cylinder 31. The size of the annular drive groove 34 matches the T-shaped drive rod 33, and the T-shaped drive rod 33 moves in the annular drive groove 34.

[0028] The arc-shaped cleaning plate 24 has a spray seat 27 fixedly installed at the center of the side near the needle seat. Several spray heads 28 for spraying solvent onto the wiping cloth 25 are fixedly installed on both sides of the spray seat 27. A piston plate 38 is movably installed inside the liquid cylinder 35. A push rod 32 passes through the liquid cylinder 35 and is fixedly connected to the piston plate 38. An outlet pipe 36 and an inlet pipe 37 are fixedly installed at the end of the liquid cylinder 35 away from the rotating cylinder 31. The inlet pipe 37 is connected to an external cleaning tank for storing alcohol. The outlet pipe 36 is connected to the spray seat 27. Both the outlet pipe 36 and the inlet pipe 37 are equipped with one-way valves.

[0029] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The power source for the liquid spraying assembly also comes from the rotational movement of the support rod 23, achieving seamless linkage between the supply of cleaning liquid and the wiping action; when the support rod 23 rotates around its own axis under the meshing drive of the rotating gear 26 and the rack plate 22, the rotating cylinder 31, which is fixedly installed at the end away from the arc-shaped cleaning plate 24, also rotates synchronously; a continuous annular drive groove 34 is provided on the outer periphery of the rotating cylinder 31, and the trajectory of the annular drive groove 34 is wavy or sinusoidal around the surface of the rotating cylinder 31; due to the push rod 32 movably set on the side frame 30, it passes through its The T-shaped drive rod 33 at the end is inserted into the annular drive groove 34, and the end dimension of the T-shaped drive rod 33 is precisely matched with the width of the groove. When the rotating cylinder 31 rotates, the curved profile of the annular drive groove 34 applies a reciprocating thrust along the axial direction of the rotating cylinder 31 to the T-shaped drive rod 33, forcing the push rod 32 to make linear reciprocating motion in the guide hole of the side frame 30. This mechanism, which converts rotational motion into piston-like reciprocating linear motion, is achieved entirely by mechanical linkage, without the need for an independent pump or solenoid valve, ensuring strict synchronization of the agent spraying and cleaning rotation in terms of rhythm and frequency.

[0030] The linear reciprocating motion of the push rod 32 directly drives the piston suction system inside the liquid cylinder 35. The push rod 32 passes through the end cap of the liquid cylinder 35 and is fixedly connected to the piston plate 38 inside the cylinder. When the push rod 32 is pushed towards the liquid cylinder 35 by the annular drive groove 34, the piston plate 38 is pushed into the cylinder, compressing the inner cavity. At this time, the one-way valve of the outlet pipe 36 opens under positive pressure, while the one-way valve of the inlet pipe 37 closes under reverse pressure. The cleaning solvent inside the cylinder is forced out and transported to the arc-shaped cleaning plate 24 through the outlet pipe 36. The spray seat 27 is located on the cylinder. When the push rod 32 is pulled back by the annular drive groove 34, the piston plate 38 is drawn backward, creating a negative pressure in the inner cavity of the cylinder. The one-way valve of the outlet pipe 36 closes under the reverse pressure difference to prevent backflow, while the one-way valve of the inlet pipe 37 opens under the negative pressure, drawing in new cleaning solvent from the inlet pipe 37 connected to the external cleaning tank, completing a complete replenishment cycle. The cooperation of the two one-way valves ensures that the flow direction of the liquid is always from the cleaning tank to the spray seat 27, eliminating any possibility of backflow from the source of contamination. After the cleaning solvent is pumped to the spray holder 27, it evenly wets the wiping cloth 25 through multiple spray heads 28, achieving targeted and quantitative wet cleaning. The spray holder 27 is fixedly installed at the center of the arc-shaped cleaning plate 24 near the needle seat, and several spray heads 28 arranged on both sides are distributed in a fan shape or array, which can atomize or drip the solvent to the key area where the wiping cloth 25 contacts the needle seat. This supply method, which permeates from the inside of the wiping cloth 25 to the outside, ensures that the solvent acts directly on the needle seat more effectively than external spraying. The friction interface between the wiping cloth 25 and the needle seat dissolves and encapsulates the release agent and impurities on the surface of the needle seat to the greatest extent, while reducing solvent splashing and waste. During the entire rotating wiping process, as the arc-shaped cleaning plate 24 continues to rotate, the annular drive groove 34 alternately pushes and pulls back the push rod 32, and the piston plate 38 repeatedly performs the liquid discharge and liquid suction strokes, providing the wiping cloth 25 with a continuous, stable and precisely controllable solvent supply, ensuring that the entire cleaning process always maintains the best wet wiping state.

[0031] See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The top of the U-shaped motion frame 20 is provided with a surrounding locking assembly for locking the needle seat around the top of the base plate 17. The surrounding locking assembly includes an arc-shaped locking plate 45 and a fixing ring 41. Four arc-shaped locking plates 45 converge from the outer periphery of the needle seat towards its center, tightly surrounding the needle seat. The surrounding locking assembly also includes an arc-shaped movable plate 42 and a pulling plate 43. A ring connecting frame 40 is fixedly installed on the top of the U-shaped motion frame 20. The fixing ring 41 is fixedly installed at the bottom center of the ring connecting frame 40. Four arc-shaped movable plates 42 are movably connected around the top periphery of the fixing ring 41 through a rotating shaft. An arc-shaped locking plate 45 is fixedly installed on the end of the arc-shaped movable plate 42 away from the fixing ring 41. A locking tooth seat 46 is fixedly installed on the side of the arc-shaped locking plate 45 near the needle seat.

[0032] A motor cover is fixedly installed on the top of the annular connecting frame 40. A servo motor 50 is fixedly installed inside the motor cover. The output end of the servo motor 50 is driven by a rotating shaft to connect to a rotating gear 51. An annular groove 47 is opened at the bottom of the annular connecting frame 40. An annular slider 48 is slidably connected in the annular groove 47. A rotating gear 44 is fixedly installed at the bottom of the annular slider 48. The rotating gear 44 and the rotating gear 51 are engaged in transmission. A pull plate 43 is movably connected to the top of the arc-shaped movable plate 42. The pull plate 43 is movably connected to the bottom of the rotating gear 44 at the end away from the fixed ring 41.

[0033] See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The power for the surrounding locking assembly comes from an independent servo motor 50, which drives the entire encircling and pressing action to be executed precisely. After the servo motor 50, which is fixed in the motor cover at the top of the annular connecting frame 40, is started, its output end drives the rotating gear 51 to rotate through the rotating shaft. The rotating gear 51 transmits torque to the rotating gear disk 44 that meshes with it. Since the rotating gear disk 44 is connected to the annular groove 47 at the bottom of the annular connecting frame 40 through the annular slider 48, the rotating gear disk 44 can make a smooth fixed-axis rotational motion around the central axis of the annular connecting frame 40 under the precise guidance of the annular groove 47. The cooperation between the annular groove 47 and the annular slider 48 provides the rotating gear disk 44 with the freedom of circumferential rotation, and strictly constrains its radial and axial movement, ensuring the coaxiality and motion accuracy of the entire transmission chain. Thus, the rotational power of the servo motor 50 is precisely transmitted as a circular motion around the center of the fixed ring 41 and parallel to the bottom surface of the annular connecting frame 40, providing a unified driving reference for the synchronous closing of the four sets of arc-shaped locking plates 45.

[0034] The rotational motion of the rotating gear disk 44 pulls the arc-shaped movable plate 42 through the pull plate 43, achieving synchronous radial convergence of the four sets of arc-shaped locking plates 45. Four pull plates 43 are movably connected to the bottom of the rotating gear disk 44, with the end of each pull plate 43 furthest from the fixed ring 41 following the rotating gear disk 44 in a circular motion. Since the other end of the pull plate 43 is movably connected to the top of the arc-shaped movable plate 42, and the middle of the arc-shaped movable plate 42 is connected to the fixed ring 41 via a rotating shaft, a lever mechanism is formed with the rotating shaft of the fixed ring 41 as the fulcrum. When the rotating gear disk 44 drives one end of the pull plate 43 to rotate... Pulling plate 43 pulls the arc-shaped movable plate 42 to swing around the connection point between it and the fixed ring 41. The four arc-shaped movable plates 42 swing inward synchronously, causing the four arc-shaped locking plates 45 fixed at their ends to evenly converge from the outer periphery of the needle seat to its center. This four-claw synchronous convergence mechanism design can automatically find the center position of the needle seat. No matter how small the position deviation is when the needle seat is placed, the four arc-shaped locking plates 45 can contract centripetally at equal distances to ensure that the locking force is evenly distributed in all directions on the outer periphery of the needle seat, avoiding needle seat skewing or excessive local stress caused by unilateral force.

[0035] As the arc-shaped locking plate 45 converges into position, the fixing ring 41 performs axial end face clamping, forming a double lock in both radial and axial directions. Locking tooth seats 46 are fixedly installed on the side of the arc-shaped locking plate 45 near the needle seat. When the arc-shaped locking plate 45 retracts to contact the outer wall of the needle seat, the tooth surfaces of the locking tooth seats 46 embed into the plastic outer wall surface of the needle seat, forming multi-point micro-mechanical engagement and providing strong anti-torsional resistance. Simultaneously, since the entire surrounding locking assembly is fixed to the top of the U-shaped motion frame 20 via the annular connecting frame 40, when the U-shaped motion frame 20 completes its descent stroke under the drive of the downward pressure drive assembly, the fixing ring 41, fixed at the center of the bottom of the annular connecting frame 40... The fixed ring 41 is also pressed down, its bottom surface pressing vertically against the top end face of the needle holder; this axial pressing force and the radial clamping force of the arc-shaped locking plate 45 are synchronously positioned and work together in the same set of descent strokes, completely eliminating any degree of freedom of movement of the needle holder on the base plate 17 in both radial and axial dimensions, providing an absolutely stable reference for the torque meter 11 to apply torsional torque to the needle tube; this dual locking mechanism ensures that all applied torque during the test is transmitted to the insert joint between the needle tube and the needle holder without loss, and the measured torque data truly reflects the connection strength of the product, fundamentally eliminating test errors caused by the needle holder not being clamped securely.

[0036] See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The base plate 17 has a base frame 12 at its bottom. The base frame 12 has a downward drive assembly inside, which drives the U-shaped motion frame 20 to descend from above the needle holder. During the descent, the arc-shaped cleaning plate 24 is driven to rotate and clean the needle holder. The driving agent cylinder 35 sprays cleaning agent liquid onto the wiping cloth 25. After descending to the bottom, the fixing ring 41 presses and locks the top of the needle holder. The downward drive assembly includes a stepper motor 13, which is fixedly installed at the center of the inner bottom of the base frame 12 by bolts. A screw 14 is fixedly installed at the output end of the stepper motor 13. A lifting plate 15 is threaded through the screw 14. The lifting plate 15 is fixedly connected to the U-shaped motion frame 20. A limit rod 16 is fixedly installed inside the base frame 12. The two ends of the lifting plate 15 move through the limit rod 16.

[0037] See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9The downward drive assembly is the main power source for the entire cleaning and locking process of the device. It precisely converts the rotational motion of the stepper motor 13 into the vertical linear motion of the U-shaped motion frame 20, providing a unified travel reference for the coordinated action of all subsequent functional modules. The stepper motor 13, fixed at the bottom center of the base frame 12, starts upon receiving a control command, and its output drives the screw 14 to rotate precisely around its own axis. Since the lifting plate 15 is internally threaded onto the screw 14, and both ends of the lifting plate 15 are movably inserted into the limiting rods 16 fixedly installed inside the base frame 12, the lifting plate 15... The rotational freedom of the screw 14 is completely constrained by the limiting rod 16; therefore, when the screw 14 rotates, the axial thrust generated by the threaded pair forces the lifting plate 15 to not follow the rotation, but only to make a smooth vertical linear motion along the guide direction of the limiting rod 16; this screw and nut transmission mechanism has extremely high displacement accuracy. For every step angle that the stepper motor 13 rotates, the lifting plate 15 is fed a precise small linear displacement, providing a controllable speed and position reference for the entire descent stroke, ensuring that the action rhythm and stroke range of each detection cycle are completely consistent, fundamentally eliminating the problem of inconsistent detection conditions caused by motion deviation.

[0038] The vertical linear motion of the lifting plate 15 is directly transmitted to the U-shaped motion frame 20 fixedly connected to it, driving the U-shaped motion frame 20 to perform a downward feed from above the needle seat. Since all functional modules, such as the support rod 23 and rotating gear 26 of the rotating wiping assembly, the rotating cylinder 31 and liquid cylinder 35 of the liquid spraying assembly, and the annular connecting frame 40 and fixing ring 41 surrounding the locking assembly, are integrated and installed on the U-shaped motion frame 20, this single downward movement of the U-shaped motion frame 20 becomes the core stroke that synchronously triggers all subsequent actions. During the descent, the rotating gear 26 meshes with the rack plate 22 to generate rotation, driving... The arc-shaped cleaning plate 24 rotates to clean the outer periphery of the needle holder; simultaneously, the rotating cylinder 31 rotates with the supporting rotating rod 23, and through the cooperation of the annular drive groove 34 and the T-shaped drive rod 33, it drives the piston plate 38 of the liquid agent cylinder 35 to reciprocate, pumping the cleaning agent liquid quantitatively to the wiping cloth 25; a set of descending actions simultaneously activates two sets of mechanical linkage mechanisms for rotating wiping and solvent supply, realizing precise synchronization of cleaning and wetting without any electronic timing control or multi-path power distribution. The reliability of this pure mechanical linkage ensures that the cleaning pretreatment before each test is strictly consistent, laying a solid foundation for improving the repeatability and comparability of test results.

[0039] When the lifting plate 15 drives the U-shaped motion frame 20 to continue descending along the direction of the limiting rod 16 to the end of its stroke, the cleaning action is just completed, and the surrounding locking component immediately enters the locked state; at this time, the fixing ring 41, which is fixedly installed at the bottom center of the annular connecting frame 40, is vertically pressed against the top end face of the needle seat as the U-shaped motion frame 20 descends to its position, completing the axial pressing and locking; throughout the process, the limiting rod 16 not only provides anti-torsional guidance for the lifting plate 15, but also ensures that the U-shaped motion frame 20 does not produce any swaying or shaking during the entire descent through its precise straightness, thus making The wiping trajectory of the arc-shaped cleaning plate 24, the pumping rhythm of the liquid cylinder 35, and the clamping position of the fixing ring 41 are all highly consistent. This consistency of action brought about by the mechanical structure directly translates into a significant improvement in the detection effect: thorough cleaning ensures that there is no interference from lubricating medium on the needle holder clamping surface, and a stable lock ensures that there is no loss in the torque transmission path. The combined effect of the two makes the data measured by the torque meter 11 truly reflect the actual strength of the combination between the needle tube and the needle holder insert, greatly reducing the misjudgment rate caused by surface contamination or loose clamping, and improving the detection accuracy and reliability of the entire detection device.

[0040] Working principle: A vibratory feeder is set up next to the testing chamber 10. Bulk insert injection needle assemblies are sorted and conveyed one by one in the vibratory feeder through high-frequency vibration, and finally arranged in a uniform posture to the discharge port. At this time, a multi-axis robot precisely picks up a single needle assembly from the discharge port of the vibratory feeder and smoothly transfers it to the testing station through a preset motion trajectory. The gripper at the end of the robot holds the needle seat part and accurately places it in the center area of ​​the top of the base plate 17 inside the testing chamber 10, and then releases and resets. The robot strictly controls the acceleration and running speed to ensure that the workpiece does not suffer any sudden inertial force or collision impact, thereby ensuring that the data obtained by the subsequent torsion test truly reflects the original insert bonding strength when the product leaves the factory, and eliminating the interference of the feeding process on the test results.

[0041] After the workpiece is in place, the device immediately enters the cleaning preparation stage. The downward drive component provides the initial power for the entire operation process. The stepper motor 13, which is fixed at the bottom center of the base frame 12, starts and drives the lifting plate 15 to move smoothly downward along the limit rod 16 through the rotation of the screw 14. Since the lifting plate 15 is fixedly connected to the U-shaped motion frame 20, the U-shaped motion frame 20 is driven synchronously and moves downward from above the needle seat. This downward stroke is the core driving source for all subsequent actions. It accurately converts the rotational power of the motor into the vertical displacement required by the cleaning component, providing a continuous and controllable motion basis for rotation wiping and surrounding locking.

[0042] During the descent of the U-shaped motion frame 20, the rotating wiping component and the liquid spraying component are activated synchronously, cleverly converting linear motion into rotational cleaning action. Rotary gears 26 are fixed on the support rods 23 at both ends of the U-shaped motion frame 20, while the rack plate 22 on the top of the arc-shaped support plate 21 remains stationary. As the U-shaped motion frame 20 descends, the rotating gears 26 are forced to mesh with the rack plate 22, thereby converting the linear motion of descent into the rotational motion of the support rods 23. This rotation is directly transmitted to the arc-shaped cleaning plate 24, causing the wiping cloth 25 attached to its inner side to closely adhere to the outer periphery of the needle seat, performing a gentle rotational wiping from top to bottom. This motion conversion requires no additional power; the torque required for cleaning is automatically generated using only the descent stroke, making the structure extremely simple and efficient.

[0043] Simultaneously, the liquid spraying assembly also intervenes. The rotation of the support rod 23 drives the rotating cylinder 31 to rotate. The annular drive groove 34 on the outer periphery of the rotating cylinder 31 pushes the T-shaped drive rod 33 to reciprocate, which in turn drives the piston plate 38 in the liquid cylinder 35 to draw in the liquid through the push rod 32. This quantitative pumping action draws in alcohol solvent from the external cleaning tank through the inlet pipe 37, and then pressurizes it to the spraying seat 27 through the outlet pipe 36. Finally, it evenly wets the wiping cloth 25 through multiple spray heads 28. This linkage ensures that the supply of cleaning liquid is precisely synchronized with the wiping action, realizing the targeted wetting and efficient dissolution of mold release agent and impurities on the needle seat surface, cleaning the surface to be tested, and eliminating any medium that may cause slippage during testing. The sprayed alcohol solvent evaporates very quickly. Before the wiping action ends and the locking assembly clamps, the needle seat surface has already dried or only has micro-marks left, and the residual liquid will not affect the lubrication of subsequent clamping.

[0044] After cleaning, the U-shaped motion frame 20 continues to descend into position, and the surrounding locking assembly begins to perform the final clamping and locking of the needle seat; the servo motor 50 fixed to the top of the annular connecting frame 40 starts, driving the rotating gear 44 to rotate on a fixed axis within the annular slide groove 47 via the rotating gear 51; the rotation of the rotating gear 44 causes the pull plate 43, which is movably connected to its bottom, to perform circular motion, thereby pulling the arc-shaped movable plate 42 to rotate around its pivot connection point with the fixed ring 41; the four arc-shaped movable plates 42 synchronously retract inward, causing the arc-shaped locking plate 45 at its end to move from... The outer periphery of the needle holder converges precisely towards its center, and the locking teeth 46, fixed inside the arc-shaped locking plate 45, are evenly embedded in the outer wall of the needle holder, achieving radial circumferential clamping. More importantly, the entire circumferential locking assembly is fixed to the top of the U-shaped motion frame 20 and enters the position synchronously with the descent stroke. The fixing ring 41 located in the center is directly and vertically pressed against the top end face of the needle holder. This action combines radial locking and axial pressing into one, completely eliminating any movement gaps in the needle holder from multiple degrees of freedom, providing a stable benchmark with extremely high rigidity and no loosening for torsion testing.

[0045] With the needle hub fully locked, the high-precision torque test is officially performed. The torque meter 11, located at the top center inside the testing housing 10, extends a precision clamp downwards to firmly hold the metal needle tube of the insert injection-molded needle. The servo motor 50 built into the torque meter 11 drives the rotating shaft to apply a precisely controlled pure rotational torque to the needle tube, simulating the screwing stress in clinical use. Since the needle hub is completely locked, any slight rotation caused by the loose fit of the insert will be accurately captured and recorded in real time by the torque sensor. By comparing with the standard requirements, the system automatically determines whether the insert fit strength of the needle assembly is qualified.

[0046] After the test is completed, the device enters the reset and self-cleaning stage; the stepper motor 13 rotates in the opposite direction, driving the lifting plate 15 and the U-shaped motion frame 20 on it to move upwards in a return motion through the screw 14; this upward movement reactivates the rotating wiping component. Since the rotating gear 26 and the rack plate 22 are always meshed, the rise of the U-shaped motion frame 20 forces the rotating gear 26 to rotate in the opposite direction, thereby driving the arc-shaped cleaning plate 24 to rotate again.

[0047] More importantly, this reverse rotation synchronously activates the liquid spraying assembly. The rotating cylinder 31 rotates in the opposite direction following the support rod 23, and its outer annular drive groove 34 pushes the T-shaped drive rod 33 again. Through the push rod 32, the piston plate 38 inside the liquid cylinder 35 performs a new round of suction. The spray head 28 on the spray seat 27 sprays an additional cleaning solvent (alcohol) onto the wiping cloth 25 on the arc-shaped cleaning plate 24. The wiping cloth 25 itself is rinsed and soaked with the fresh solvent, removing the release agent wiped off the needle seat surface in the previous cleaning cycle. The solvent is diluted and dispersed by the cleaning process. At the same time, the rotation of the arc-shaped cleaning plate 24 in the air uses centrifugal force to throw some of the dirty solvent off the wiping cloth 25, completing the initial self-cleaning process and keeping the wiping cloth 25 moist and clean, providing a stable initial guarantee for the cleaning effect of the next workpiece to be inspected. The alcohol solvent used here evaporates quickly after briefly wetting the wiping cloth. When the next needle assembly is placed and clamped, the wiping cloth is already slightly moist or nearly dry, and will not transfer liquid to the needle seat, fundamentally eliminating the possibility of solvent residue weakening the clamping force.

[0048] At the same time, the surrounding locking assembly also resets synchronously during the rise of the U-shaped motion frame 20. The servo motor 50 drives the rotating gear disk 44 in the opposite direction, which in turn drives the arc-shaped movable plate 42 to unfold outward through the pulling plate 43. The arc-shaped locking plate 45 loosens its grip on the needle seat, and the fixing ring 41 disengages from the top end face of the needle seat. The inspected workpiece is taken out from the base plate 17 by another set of robots according to the inspection results and classified and placed in the qualified or unqualified product area. The entire device returns to the initial standby state, waiting for the vibrating plate and the feeding robot to deliver the next needle assembly to be inspected, and enters a new inspection cycle.

[0049] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Those skilled in the art can make various changes within their knowledge without departing from the spirit of the present invention.

Claims

1. A reliability testing device for medical insert injection molded needle assemblies, comprising a testing housing (10), wherein a torque meter (11) for performing torsion tests on the insert injection molded needle assembly is provided on the inner top of the testing housing (10), and a base plate (17) for supporting the injection molded needle is fixedly installed inside the testing housing (10), characterized in that, The bottom of the base plate (17) is movably provided with a U-shaped motion frame (20), and a rotating wiping assembly is provided on the U-shaped motion frame (20) for rotating and cleaning the mold release agent and impurities on the outer periphery of the needle seat from top to bottom. The rotating wiping assembly includes a support rotating rod (23), a rotating gear (26) and an arc-shaped cleaning plate (24). The support rod (23) is also equipped with a liquid spraying assembly for spraying cleaning solvent onto the wiping cloth (25) on the arc-shaped cleaning plate (24). The liquid spraying assembly includes a rotating cylinder (31) and a liquid cylinder (35). During the process of the arc-shaped cleaning plate (24) rotating and cleaning the needle seat surface, the liquid cylinder (35) delivers cleaning liquid to the wiping cloth (25). The top of the U-shaped motion frame (20) is provided with a surrounding locking assembly for locking the needle seat around the top of the base plate (17). The surrounding locking assembly includes an arc-shaped locking plate (45) and a fixing ring (41). The four arc-shaped locking plates (45) converge from the outer periphery of the needle seat to its center, tightly surrounding the needle seat. The base plate (17) is provided with a base frame (12) at the bottom. The base frame (12) is provided with a downward drive assembly, which is used to drive the U-shaped motion frame (20) to descend from above the needle seat. During the descent, the arc-shaped cleaning plate (24) is driven to rotate and clean the needle seat. The driving agent cylinder (35) sprays cleaning agent liquid onto the wiping cloth (25). After descending to the position, the fixing ring (41) presses and locks the top of the needle seat.

2. The reliability testing device for a medical insert injection-molded needle assembly according to claim 1, characterized in that, The detection housing (10) is equipped with a torque meter (11) located at the center above the base plate (17). The torque meter (11) clamps and twists the needle of the insert injection needle. The rotating wiping assembly also includes a rack plate (22). Arc-shaped support plates (21) are fixedly installed at both ends of the top of the base frame (12). A rack plate (22) is fixedly installed on the top of the arc-shaped support plate (21). The U-shaped motion frame (20) has a support rod (23) connected to both ends by bearings. An arc-shaped cleaning plate (24) is fixedly installed at one end of the support rod (23). Wiping cloths (25) are provided at both ends of the arc-shaped cleaning plate (24) near the needle seat for wiping the outer periphery of the needle seat.

3. The reliability testing device for a medical insert injection-molded needle assembly according to claim 2, characterized in that, A rotating gear (26) is fixedly installed on the support rod (23), and the rotating gear (26) is engaged with the rack plate (22) for transmission.

4. The reliability testing device for a medical insert injection-molded needle assembly according to claim 1, characterized in that, The liquid spraying assembly also includes a push rod (32), and a side frame (30) is fixedly installed on the side of the U-shaped motion frame (20) away from the arc-shaped cleaning plate (24). The side frame (30) is located at the top of the rotating gear (26). The bottom of the side frame (30) is movably connected to the rotating cylinder (31) through the bearing. The supporting rotating rod (23) is fixedly installed at the center of the rotating cylinder (31) at the end away from the arc-shaped cleaning plate (24). A liquid cylinder (35) is fixedly installed on the side frame (30) at the end away from the arc-shaped cleaning plate (24). A push rod (32) is movably installed on the side frame (30). A T-shaped drive rod (33) is fixedly installed on the push rod (32). An annular drive groove (34) is opened on the outer periphery of the rotating cylinder (31). The size of the annular drive groove (34) matches the T-shaped drive rod (33), and the T-shaped drive rod (33) moves in the annular drive groove (34).

5. The reliability testing device for a medical insert injection-molded needle assembly according to claim 4, characterized in that, The arc-shaped cleaning plate (24) has a spray seat (27) fixedly installed at the center of one side near the needle seat. Several spray heads (28) for spraying solvent onto the wiping cloth (25) are fixedly installed on both sides of the spray seat (27). A piston plate (38) is movably installed inside the liquid cylinder (35). A push rod (32) passes through the liquid cylinder (35) and is fixedly connected to the piston plate (38). The liquid cylinder (35) has an outlet pipe (36) and an inlet pipe (37) fixedly installed at the end away from the rotating cylinder (31). The inlet pipe (37) is connected to the external cleaning tank for storing alcohol, and the outlet pipe (36) is connected to the spray seat (27). Both the outlet pipe (36) and the inlet pipe (37) are equipped with one-way valves.

6. The reliability testing device for a medical insert injection-molded needle assembly according to claim 1, characterized in that, The surrounding locking assembly also includes an arc-shaped movable plate (42) and a pull plate (43). A ring connecting frame (40) is fixedly installed on the top of the U-shaped motion frame (20). A fixed ring (41) is fixedly installed at the bottom center of the ring connecting frame (40). Four arc-shaped movable plates (42) are movably connected around the top of the fixed ring (41) through a rotating shaft. An arc-shaped locking plate (45) is fixedly installed on the end of the arc-shaped movable plate (42) away from the fixed ring (41). A locking tooth seat (46) is fixedly installed on the side of the arc-shaped locking plate (45) near the needle seat.

7. The reliability testing device for a medical insert injection-molded needle assembly according to claim 6, characterized in that, The top of the annular connecting frame (40) is fixedly installed with a motor cover, and a servo motor (50) is fixedly installed inside the motor cover. The output end of the servo motor (50) is connected to a rotating gear (51) through a rotating shaft. The bottom of the annular connecting frame (40) is provided with an annular groove (47), and an annular slider (48) is slidably connected in the annular groove (47). A rotating gear (44) is fixedly installed at the bottom of the annular slider (48), and the rotating gear (44) is engaged with the rotating gear (51). A pulling plate (43) is movably connected to the top of the arc-shaped movable plate (42), and the pulling plate (43) is movably connected to the bottom of the rotating gear (44) at the end away from the fixed ring (41).

8. The reliability testing device for a medical insert injection-molded needle assembly according to claim 1, characterized in that, The downward drive assembly includes a stepper motor (13), which is fixedly installed at the center of the inner bottom of the base frame (12) by bolts. A screw (14) is fixedly installed at the output end of the stepper motor (13), and a lifting plate (15) is threaded through the screw (14). The lifting plate (15) is fixedly connected to the U-shaped motion frame (20). A limiting rod (16) is fixedly installed inside the base frame (12), and the two ends of the lifting plate (15) move through the limiting rod (16).

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