Injector screw rod mechanism

Abstract

The utility model discloses an injector screw rod mechanism which comprises a rack, a first motor and a second motor are fixedly installed on the rack, a plurality of first rotating shafts are rotatably arranged on the rack, a plurality of second rotating shafts are rotatably arranged on the rack, the first rotating shafts are driven by the first motor to rotate, and the second rotating shafts are driven by the second motor to rotate. The second rotating shafts are driven by a second motor to rotate, each first rotating shaft is in transmission connection with a first rod screwing shaft, each first rod screwing shaft is connected with a first rod screwing wheel, each second rotating shaft is in transmission connection with a second rod screwing shaft, and each second rod screwing shaft is connected with a second rod screwing wheel. Compared with the prior art, the automatic rod screwing device has the advantages that automatic rod screwing of the injector can be achieved, under-screwing and over-screwing phenomena are avoided, the structure is simple, and the automation degree is high.

Description

Technical Field

[0001] This utility model relates to a screw-tightening mechanism, and more particularly to a syringe screw-tightening mechanism. Background Technology

[0002] Pre-filled syringes are becoming increasingly widely used due to their ease of use and low error rate. During the packaging process, these syringes require screwing on the plunger; over-tightening or under-tightening is not advisable. Over-tightening causes the stopper to compress the medication, resulting in it being squeezed out. Under-tightening leads to unstable engagement between the plunger and the stopper, posing a risk of the syringe falling off during transport. Therefore, a solution is urgently needed. Utility Model Content

[0003] The purpose of this invention is to provide a syringe screw mechanism to address the problems mentioned in the background section.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A syringe screw-twisting mechanism includes a frame on which a first motor and a second motor are fixedly mounted. Multiple first rotating shafts and multiple second rotating shafts are rotatably mounted on the frame. The first rotating shafts are driven to rotate by the first motors, and the multiple second rotating shafts are driven to rotate by the second motors. Each first rotating shaft is driven to a first screw-twisting shaft, and a first screw-twisting wheel is connected to the first screw-twisting shaft. Each second rotating shaft is driven to a second screw-twisting shaft, and a second screw-twisting wheel is connected to the second screw-twisting shaft.

[0006] In a preferred embodiment of this utility model, the first rotating shaft is connected to the first screw rod shaft via a universal coupling, and the second rotating shaft is connected to the second screw rod shaft via a universal coupling.

[0007] As a preferred embodiment of the present invention, the first screw shaft is provided with a clamping assembly for pressing the first screw wheel onto the syringe barrel, and the second screw shaft is provided with a clamping assembly for pressing the second screw wheel onto the syringe barrel.

[0008] In a preferred embodiment of this utility model, the clamping assembly includes a movable block, the frame has a slot, the movable block is disposed in the slot, and the movable block can move radially along the first screw wheel. A clamping spring is disposed between the movable block and the slot wall of the slot.

[0009] As a preferred embodiment of the present invention, each first rotating shaft is fixedly equipped with a first rotating gear, the first rotating gears on adjacent first rotating shafts are connected by a first transmission gear, a first driving gear is fixedly installed on the output shaft of the first motor, and the first driving gear meshes with the first rotating gear on any one of the first rotating shafts.

[0010] As a preferred embodiment of the present invention, each second rotating shaft is fixedly equipped with a second rotating gear, the second rotating gears on adjacent second rotating shafts are connected by a second transmission gear, a second drive gear is fixedly installed on the output shaft of the second motor, and the second drive gear meshes with the second rotating gear on any one of the second rotating shafts.

[0011] In a preferred embodiment of this utility model, both the first screw wheel and the second screw wheel are rubber wheels.

[0012] The beneficial effects of this utility model are that, compared with the prior art, this utility model can realize the automatic screw tightening of the syringe rod without under-tightening or over-tightening, and has a simple structure and a high degree of automation. Attached Figure Description

[0013] Figure 1 This is a front view of a syringe screw mechanism according to the present invention;

[0014] Figure 2 This is a top view of a syringe screw mechanism according to the present invention;

[0015] Figure 3 This is a three-dimensional structural diagram of a syringe screw mechanism according to the present invention.

[0016] In the picture:

[0017] 1. Frame; 2. First motor; 3. Second motor; 4. First screw shaft; 5. Second screw shaft; 6. First screw wheel; 7. Second screw wheel; 8. Universal coupling; 9. Compression spring; 10. Moving block; 11. First drive gear; 12. Second drive gear. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, a mechanical connection, an electrical connection, or an indirect connection through an intermediate medium. They can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] In the description of this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Please refer to Figures 1 to 3 As shown, Figure 1 This is a front view of a syringe screw mechanism according to the present invention; Figure 2 This is a top view of a syringe screw mechanism according to the present invention; Figure 3 This is a three-dimensional structural diagram of a syringe screw mechanism according to the present invention.

[0022] In this embodiment, a syringe screwing mechanism includes a frame 1, on which a first motor 2 and a second motor 3 are fixedly mounted. Four first rotating shafts and three second rotating shafts are rotatably mounted on the frame 1. The four first rotating shafts are driven to rotate by the first motor 2, and the three second rotating shafts are driven to rotate by the second motor 3. Each first rotating shaft is driven to connect a first screwing shaft 4, and a first screwing wheel 6 is connected to the first screwing shaft 4. Each second rotating shaft is driven to connect a second screwing shaft 5, and a second screwing wheel 7 is connected to the second screwing shaft 5.

[0023] Specifically, in this embodiment, the first rotating shaft is connected to the first screw rod shaft 4 via a universal coupling 8, and the second rotating shaft is connected to the second screw rod shaft 5 via a universal coupling 8.

[0024] Specifically, in this embodiment, the first screw shaft 4 is provided with a clamping assembly for pressing the first screw wheel 6 onto the syringe barrel, and the second screw shaft 5 is provided with a clamping assembly for pressing the second screw wheel 7 onto the syringe barrel.

[0025] Specifically, in this embodiment, the clamping assembly includes a movable block 10. The frame 1 has a slot, the movable block 10 is disposed in the slot, and the movable block 10 can move radially along the first screw wheel 6. A clamping spring 9 is disposed between the movable block 10 and the slot wall. By providing the clamping spring 9, the first screw wheel 6 and the second screw wheel 7 can exert a pre-tightening force on the syringe barrel, while also preventing excessive clamping that could damage the syringe, thus providing a certain degree of protection.

[0026] Specifically, in this embodiment, each first rotating shaft is fixedly equipped with a first rotating gear, and the first rotating gears on adjacent first rotating shafts are connected by a first transmission gear. A first drive gear 11 is fixedly installed on the output shaft of the first motor 2, and the first drive gear 11 meshes with the first rotating gear on any one of the first rotating shafts.

[0027] Specifically, in this embodiment, each second rotating shaft is fixedly equipped with a second rotating gear, and the second rotating gears on adjacent second rotating shafts are connected by a second transmission gear. A second drive gear 12 is fixedly installed on the output shaft of the second motor 3, and the second drive gear 12 meshes with the second rotating gear on any one of the second rotating shafts.

[0028] Specifically, in this embodiment, both the first screw wheel 6 and the second screw wheel 7 are rubber wheels to avoid damaging the syringe.

[0029] It is worth mentioning that, although in this embodiment, the first screw shaft 4 is set to 4 pieces and the second screw shaft 5 is set to 3 pieces, the present invention is not limited to this. This embodiment is a preferred solution after considering the actual production situation and cost.

[0030] During operation, the first motor 2 starts and drives the first screw-tightening wheel 6 to rotate. When the syringe passes through the first screw-tightening wheel 6, the rotating first screw-tightening wheel 6 comes into contact with the syringe barrel. Since the push rod is clamped and fixed, the syringe barrel can rotate relative to the push rod, thus tightening the screw. After tightening, a check is performed to see if there is any under-tightening or over-tightening. For syringes that are under-tightened, they enter the second screw-tightening stage. At this time, the second motor 3 starts and drives the second screw-tightening wheel 7 to rotate. The under-tightened syringes then pass through the second screw-tightening wheel 7 to achieve a second screw-tightening, ensuring screw-tightening accuracy. For syringes that are over-tightened, they can also be corrected through the second screw-tightening stage. At this time, the second motor 3 rotates to achieve correction, ensuring screw-tightening accuracy.

[0031] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims.

Claims

1. A syringe screw-operated mechanism, comprising a frame, characterized in that: A first motor and a second motor are fixedly mounted on the frame. Multiple first rotating shafts and multiple second rotating shafts are rotatably mounted on the frame. The multiple first rotating shafts are driven to rotate by the first motors, and the multiple second rotating shafts are driven to rotate by the second motors. Each first rotating shaft is driven to connect to a first screw shaft, and a first screw wheel is connected to the first screw shaft. Each second rotating shaft is driven to connect to a second screw shaft, and a second screw wheel is connected to the second screw shaft.

2. The syringe screw-operated mechanism according to claim 1, characterized in that: The first rotating shaft is connected to the first screw rod shaft via a universal coupling, and the second rotating shaft is connected to the second screw rod shaft via a universal coupling.

3. The syringe screw-operated mechanism according to claim 2, characterized in that: The first screw shaft is provided with a clamping assembly for pressing the first screw wheel onto the syringe barrel, and the second screw shaft is provided with a clamping assembly for pressing the second screw wheel onto the syringe barrel.

4. The syringe screw-operated mechanism according to claim 3, characterized in that: The clamping assembly includes a movable block. The frame has a slot, the movable block is disposed in the slot, and the movable block can move radially along the first screw wheel. A clamping spring is disposed between the movable block and the slot wall.

5. The syringe screw-operated mechanism according to claim 1, characterized in that: Each first rotating shaft is fixedly equipped with a first rotating gear. The first rotating gears on adjacent first rotating shafts are connected by a first transmission gear. A first drive gear is fixedly installed on the output shaft of the first motor. The first drive gear meshes with the first rotating gear on any one of the first rotating shafts.

6. A syringe screw-operated mechanism according to claim 5, characterized in that: Each second rotating shaft is fixedly equipped with a second rotating gear. The second rotating gears on adjacent second rotating shafts are connected by a second transmission gear. A second drive gear is fixedly installed on the output shaft of the second motor. The second drive gear meshes with the second rotating gear on any one of the second rotating shafts.

7. A syringe screw-operated mechanism according to any one of claims 1 to 6, characterized in that: Both the first and second screw-on wheels are rubber wheels.

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