A conveying device for producing a syringe plunger rubber plug

Abstract

This invention belongs to the field of medical device manufacturing technology, specifically relating to a conveying device for producing syringe plunger stoppers. It includes a base, a hopper, and a spiral channel. The spiral channel is connected to the bottom of the hopper and located inside the base. A sleeve is rotatably connected to the outside of the base, and a geared disc is integrally formed on the outside of the sleeve. A motor drives the sleeve to rotate through gear meshing with the geared disc. The inner wall of the sleeve has interconnected spiral grooves and inclined grooves. Ball bearings are slidably connected to the outside of the hopper, rolling within the spiral grooves and inclined grooves. A threaded sleeve is connected above the sleeve, and a spring is provided between the threaded sleeve and the hopper. A limiting piece is provided at the bottom of the threaded sleeve. An arc-shaped block is slidably connected within a groove on the outer wall of the sleeve, and a push rod that can extend into the inclined groove is provided on the inner side of the arc-shaped block. This invention achieves automated unblocking by causing the hopper to vibrate up and down through the rotation of the sleeve. The vibration intensity is adjustable, balancing anti-clogging effect and stopper protection, effectively improving conveying efficiency and production quality.

Description

Technical Field

[0001] This invention belongs to the field of medical device manufacturing technology, and specifically relates to a delivery device for producing syringe plunger rubber stoppers. Background Technology

[0002] As a core sealing component that comes into direct contact with the liquid medication, the syringe plunger stopper's surface quality and dimensional accuracy directly affect drug safety. In automated assembly lines, the stoppers must be fed into the next process in an orderly manner via hoppers and conveyor channels. Due to the soft material, light weight, and high surface friction coefficient of the stoppers, they are prone to blockages such as jamming and bridging at the bottom of the hopper and at channel diameter changes due to mutual compression and electrostatic adsorption. This can lead to interruptions in the supply of materials and severely impact production efficiency.

[0003] To address the aforementioned issues, conventional anti-clogging solutions in the industry are mostly based on vibration principles. For example, patent CN101412468A discloses a vibrating hopper for conveying syringe stoppers. The hopper features a spiral feeding channel with an arrangement structure for single-row output of the stoppers and a screening mechanism to guide the stopper direction. Vibration causes the stoppers to be conveyed orderly along the spiral channel. However, this solution uses a single vibrating plate, resulting in a limited vibration mode. Furthermore, under high-frequency conditions, the stoppers experience increased collisions and friction, leading to electrostatic adsorption and surface micro-damage, thus affecting product yield.

[0004] Further improvements can be found in patent CN116281028B, which discloses a vibrating hopper for conveying syringe stoppers. This hopper includes a vibrating disc, a support base, and a storage cylinder. Multiple vibrating motors are installed on the outer circumference of the support cylinder to drive the vibrating disc, and the storage cylinder facilitates the intermittent falling of the stoppers, thereby improving storage capacity and preventing feeding failures. While this solution alleviates the problem of frequent feeding by adding a storage cylinder, its vibration mode still relies on the excitation of the vibrating disc by the vibrating motors. This also suffers from the drawback of difficulty in precisely adjusting the vibration intensity—too weak vibration results in poor unblocking effect, while too strong vibration intensifies collisions between stoppers, easily causing surface damage.

[0005] In summary, existing technologies lack a flexible conveying device that can effectively prevent rubber stopper clogging, dynamically adjust vibration intensity according to actual working conditions, and avoid physical damage to the rubber stopper surface. Therefore, there is a need to provide a conveying device for producing syringe plunger rubber stoppers to solve the aforementioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a conveying device for manufacturing syringe plunger stoppers, in order to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a conveying device for producing syringe plunger stoppers, comprising a base, a hopper, and a spiral channel. The spiral channel is connected to the bottom of the hopper. A countersunk hole is provided above the base, and the entire structure is through-hole. Bosses are provided on the left and right sides of the bottom of the hopper. A groove is provided on the inner wall of the countersunk hole, and the groove is slidably connected to the bosses of the hopper. The spiral channel is located inside the base and is interconnected with the next process step. A sleeve is rotatably connected to the outer side of the base. A gear is integrally formed on the outer side of the sleeve. A mounting platform is integrally formed on the outer side of the base, and a motor is mounted on the mounting platform. The output end of the motor is connected to a gear, and gear transmission is achieved through meshing with the gear. Two sets of opposing spiral grooves and inclined grooves are provided on the inner wall of the sleeve, and the spiral grooves and inclined grooves are interconnected. Ball bearings are rotatably connected to the outer side of the hopper, and the ball bearings are rotatably connected within the spiral grooves and inclined grooves.

[0008] The present invention further illustrates that a threaded sleeve is connected to the upper part of the sleeve, and a limit is provided at the upper end of the threaded sleeve and the outer side of the hopper, and a spring is provided between the limit.

[0009] The present invention further illustrates that the upper part of the sleeve is threaded and is threadedly connected to the threaded sleeve.

[0010] The present invention further illustrates that the outer wall of the sleeve is provided with a sliding groove, and the left and right sides of the sliding groove are slidably connected with arc-shaped blocks. The inner side of the arc-shaped blocks is integrally formed with a top rod. The left and right sides of the inside of the sleeve are provided with sliding holes, and the top rod is slidably connected in the sliding holes. The inner end of the sliding hole is connected to the inclined groove.

[0011] The present invention further illustrates that the bottom end of the threaded sleeve is integrally formed with a limiting piece, the bottom end of the limiting piece is in contact with the outer side of the arc-shaped block, and the inner end of the push rod is spherical and enters the inclined groove after movement.

[0012] The present invention further illustrates that the outer side of the arc-shaped block is trapezoidal, and the lower end of the limiting piece is arc-shaped.

[0013] The present invention further illustrates that the limiting piece is elastic.

[0014] The present invention further illustrates that both of the arc-shaped blocks are magnetic, and their magnetic poles are opposite.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: It provides excellent anti-clogging performance while avoiding damage to the rubber stoppers. The spiral grooves and inclined grooves on the inner wall of the sleeve work in conjunction with the ball bearings to create a regular up-and-down shaking motion in the hopper, automatically clearing blockages. The spring structure stores energy when moving upward and releases it when moving downward. Combined with the deceleration effect of the inclined groove, this ensures both effective clearing and prevents excessive shaking that could cause the rubber stoppers to collide and damage each other, thus balancing anti-clogging performance with product quality.

[0016] The vibration intensity is adjustable to adapt to different working conditions. By rotating the screw sleeve to move the sleeve up and down, the spring can be pre-compressed, changing the basic vibration intensity to adapt to different feeding speed requirements. At the same time, the downward movement of the sleeve drives the limiting plate to push the arc block, causing the push rod to extend into the inclined groove and collide with the ball, forming a two-stage vibration and shock, realizing graded adjustment of the unblocking intensity and a wider range of applications.

[0017] The structure is stable and reliable with a long service life. The two arc-shaped blocks adopt a magnetic design with opposite magnetic poles. When the push rod is not working, they are attracted to each other by magnetic force and firmly fixed in the slide groove to prevent them from falling off, while improving the smoothness of movement. The reciprocating impact between the push rod and the ball causes the arc-shaped blocks to rub against each other in the slide groove, which plays a self-polishing role and ensures smooth operation in the long term. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is an exploded view of the present invention; Figure 5 This is a schematic diagram showing the positional relationship between the spiral groove, the inclined groove, and the sliding hole of the present invention. Figure 6 This is a schematic diagram of the arc-shaped block structure of the present invention; In the diagram: 1. Base; 2. Hopper; 21. Ball bearing; 3. Spiral channel; 4. Sleeve; 41. Gear plate; 42. Spiral groove; 43. Inclined groove; 44. Arc block; 441. Top rod; 5. Mounting platform; 6. Screw sleeve; 61. Limiting plate; 7. Spring. Detailed Implementation

[0019] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-6 The present invention provides a technical solution: a conveying device for producing syringe plunger rubber stoppers, comprising a base 1, a hopper 2 and a spiral channel 3, wherein the spiral channel 3 is connected to the bottom of the hopper 2, and a countersunk hole is provided above the base 1, and the whole is through-shaped; The bottom left and right sides of the hopper 2 are provided with protrusions, the inner wall of the countersunk hole is provided with grooves, and the grooves are slidably connected to the protrusions of the hopper 2. The spiral channel 3 is located inside the base 1 and is connected to the next process. The outer side of the base 1 is rotatably connected with a sleeve 4. The outer side of the sleeve 4 is integrally formed with a gear 41. The outer side of the base 1 is integrally formed with a mounting platform 5, and a motor is installed on the mounting platform 5. The output end of the motor is connected to a gear, and gear transmission is achieved by meshing with the gear 41. The inner wall of the sleeve 4 is provided with two sets of opposite spiral grooves 42 and inclined grooves 43, and the spiral grooves 42 and inclined grooves 43 are interconnected. The outer side of the hopper 2 is connected to a rolling ball 21, which is rolled within the spiral groove 42 and the inclined groove 43. After processing, the syringe plunger stopper falls into hopper 2 and then enters the next process through spiral channel 3. The hopper 2 and spiral channel 3 transport the stopper, which can prevent physical damage, avoid jamming and deformation, and control static electricity to prevent adsorption and dust. When the stopper enters spiral channel 3 from hopper 2, in order to avoid blockage, the drive motor can be run and the gear transmission can be used to make the gear plate 41 drive the sleeve 4 to rotate. The ball bearings 21 on the outside of hopper 2 roll in spiral groove 42 and inclined groove 43 and generate axial force, thereby driving hopper 2 to move up and down and generate vibration, which clears the blockage of the stopper and avoids material accumulation affecting processing efficiency. Automated unblocking greatly improves production efficiency and plays a role in preventing jamming.

[0021] A screw sleeve 6 is connected to the upper part of the sleeve 4. Limits are provided at the upper end of the screw sleeve 6 and the outer side of the hopper 2, and a spring 7 is provided between the limits. When the ball bearing 21 rolls in the spiral groove 42, it generates an axial force, causing the hopper 2 to move upward. It squeezes the spring 7 at the limit point, and the spring 7 deforms under the force. Then, when the ball bearing 21 enters the inclined groove 43, the motor continues to rotate, and the hopper 2 moves downward. The reaction force of the spring 7 accelerates the downward movement, thereby increasing the shaking intensity and further improving the unblocking effect. The inclined groove 43 can relatively slow down the downward movement speed of the hopper 2, so that the shaking intensity is not too high, avoiding damage caused by the collision between the rubber plugs due to excessive shaking intensity, and ensuring production quality.

[0022] The upper part of the sleeve 4 is threaded and is threadedly connected to the threaded sleeve 6; When the feeding speed is fast and the blockage is frequent, the operator can rotate the sleeve 4 to move it downward through the threaded drive. The inner limiter squeezes the spring 7 and pre-compresses the spring 7, thereby improving the subsequent vibration intensity, adapting to different feeding speeds, and expanding the application range.

[0023] The outer wall of the sleeve 4 is provided with a sliding groove, and the left and right sides of the sliding groove are slidably connected with arc-shaped blocks 44. The inner side of the arc-shaped blocks 44 is integrally formed with a push rod 441. The left and right sides of the sleeve 4 are provided with sliding holes, and the push rod 441 is slidably connected in the sliding holes. The inner end of the sliding holes is connected to the inclined groove 43.

[0024] The bottom end of the threaded sleeve 6 is integrally formed with a limiting piece 61. The bottom end of the limiting piece 61 is in contact with the outer side of the arc-shaped block 44. The inner end of the push rod 441 is spherical and enters the inclined groove 43 after moving. As the sleeve 4 moves downward, it causes the limiting piece 61 to move downward and come into contact with the arc-shaped block 44, pushing the arc-shaped block 44 inward. This causes the push rod 441 to slide along the sliding hole and enter the inclined groove 43. Then, the ball bearing 21 rolls into the inclined groove 43 and comes into contact with the inner end of the push rod 441. The two collide to perform a second-stage shaking, which fully clears the material and avoids blockage. The shaking also generates impact vibration, which can speed up the material conveying and further improve efficiency.

[0025] The outer side of the arc-shaped block 44 is trapezoidal, and the lower end of the limiting piece 61 is arc-shaped; As the screw sleeve 6 moves downward, the pre-compression strength of the spring 7 gradually increases. At the same time, since the outer side of the arc block 44 is trapezoidal, when the limiting piece 61 contacts the outer side of the arc block 44, it slides along the trapezoidal surface, thereby gradually pushing the arc block 44 inward. The part of the inner end of the push rod 441 entering the inclined groove 43 gradually strengthens. Thus, while the shaking intensity is increased by the spring 7, the intensity of the second-stage shaking and vibration is simultaneously increased. This can effectively prevent the rubber plug from accumulating at the upper end of the spiral channel 3, ensuring that the rubber plug can enter the spiral channel 3 in sequence and maintain a good conveying effect.

[0026] The limiting piece 61 is elastic; When the ball bearing 21 collides and squeezes against the inner end of the push rod 441, the arc-shaped block 44 is subjected to outward force, which pushes the limiting plate 61 to deform outward. This allows the ball bearing 21 to roll smoothly and continuously in the inclined groove 43, avoiding the phenomenon of running stuck. After the ball bearing 21 rolls past the push rod 441, the reaction force generated by the limiting plate 61 causes the push rod 441 to move quickly inward and collide with the outer surface of the hopper 2, thereby increasing the vibration intensity. At the same time, instantaneous friction is generated between the two, which causes a momentary jam during the up and down movement of the hopper 2, so as to maximize the vibration intensity and ensure that the material is conveyed smoothly.

[0027] Both arc-shaped blocks 44 are magnetic, but their magnetic poles are opposite. When the limiting piece 61 is not in contact with the arc block 44, the magnetic attraction between the two arc blocks 44 can make the arc block 44 firmly fixed in the groove, preventing it from falling off the sleeve 4 and improving the smoothness of their movement. At the same time, in the initial state, the limiting piece 61 is not in contact with the arc block 44, and the magnetic attraction between the arc blocks 44 makes the push rod 441 enter the inclined groove 43 in the initial state. As the ball 21 continuously squeezes and releases the push rod 441, the arc block 44 moves back and forth continuously, and its outer surface rubs against the inner wall of the groove to play a polishing role, thereby ensuring the smoothness of subsequent movement. With a simple overall structure and low manufacturing cost, it can be mass-produced and thus applied to all equipment that requires the delivery of rubber stoppers.

[0028] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention 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, and these 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 the present invention.

Claims

1. A conveying device for the production of syringe plunger stoppers, comprising a base (1), a hopper (2) and a screw channel (3), characterized in that: The spiral channel (3) is connected to the bottom of the hopper (2), and the base (1) is provided with a countersunk hole above it, and the whole is through-hole; The bottom left and right sides of the hopper (2) are provided with bosses, the inner wall of the countersunk hole is provided with grooves, and the grooves are slidably connected to the bosses of the hopper (2). The spiral channel (3) is located inside the base (1) and is connected to the next process. The outer side of the base (1) is rotatably connected with a sleeve (4). The outer side of the sleeve (4) is integrally formed with a gear plate (41). The outer side of the base (1) is integrally formed with a mounting platform (5), and a motor is installed on the mounting platform (5). The output end of the motor is connected with a gear, and gear transmission is achieved by meshing with the gear plate (41). The inner wall of the sleeve (4) is provided with two sets of opposite spiral grooves (42) and inclined grooves (43), and the spiral grooves (42) and inclined grooves (43) are interconnected. The outer side of the hopper (2) is connected to a ball bearing (21), which is rolled within the spiral groove (42) and the inclined groove (43).

2. The delivery device of claim 1, wherein: A screw sleeve (6) is connected to the upper part of the sleeve (4). Limits are provided at the upper end of the screw sleeve (6) and the outer side of the hopper (2), and springs (7) are provided between the limits.

3. The conveying device for producing syringe plunger stoppers according to claim 2, characterized in that: The upper part of the sleeve (4) is threaded and is threadedly connected to the threaded sleeve (6).

4. The conveying device for producing syringe plunger stoppers according to claim 3, characterized in that: The outer wall of the sleeve (4) is provided with a sliding groove, and the left and right sides of the sliding groove are slidably connected with arc-shaped blocks (44). The inner side of the arc-shaped block (44) is integrally formed with a top rod (441). The left and right sides of the inside of the sleeve (4) are provided with sliding holes, and the top rod (441) is slidably connected in the sliding hole. The inner end of the sliding hole is connected to the inclined groove (43).

5. The conveying device for producing syringe plunger rubber stoppers according to claim 4, characterized in that: The bottom end of the threaded sleeve (6) is integrally formed with a limiting piece (61). The bottom end of the limiting piece (61) is in contact with the outer side of the arc block (44). The inner end of the push rod (441) is spherical and enters the inclined groove (43) after moving.

6. The conveying device for producing syringe plunger rubber stoppers according to claim 5, characterized in that: The outer side of the arc-shaped block (44) is trapezoidal, and the lower end of the limiting piece (61) is arc-shaped.

7. A conveying device for producing syringe plunger stoppers according to claim 6, characterized in that: The limiting piece (61) is elastic.

8. A conveying device for producing syringe plunger stoppers according to claim 7, characterized in that: Both of the arc-shaped blocks (44) are magnetic, and their magnetic poles are opposite.

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