A jig for assembling an injection pen

Abstract

A kind of injection pen assembly jig, including jig main body, embrace mechanism, the accommodating hole of placing lower pen shell is provided on the jig main body, the embrace mechanism is telescopically arranged on the jig main body, and lower pen shell placed in the accommodating hole is embraced by the embrace mechanism;When needing to insert lower pen shell in the accommodating hole or take out the injection pen of assembly, the embrace mechanism is released under the action of external force.By the jig, the vertical positioning of lower pen shell can be realized, to provide good assembly basis for assembly, improve production efficiency and product yield.

Description

Technical Field

[0001] This invention relates to the field of automation, particularly to the field of automated assembly of injection pens, and specifically to a fixture structure for assembling injection pens. Background Technology

[0002] Currently, the assembly process for injection pens is cumbersome due to manual operation. The specific steps are: inserting the pre-filled spectrometer (PFS) into the lower pen housing, pressing the PFS into place, assembling the upper pen housing onto the lower pen housing, and then pressing the upper and lower pen housings together. Because the assembly process is entirely manual, the lower pen housing cannot be maintained in its correct position during assembly, leading to low assembly quality and efficiency. To address these issues, an automated assembly machine for injection pens has been developed. During automated assembly, the lower pen housing is used as a base, requiring it to be kept vertical and stationary. Therefore, a fixture that secures the lower pen housing and facilitates its insertion and removal is crucial. Summary of the Invention

[0003] The purpose of this invention is to provide a fixture for assembling an injection pen, which can fix the lower pen shell during automatic assembly of the injection pen, facilitate the insertion and removal of the lower pen shell, and ensure that the lower pen shell does not tilt during the assembly process.

[0004] To solve the above-mentioned technical problems, the present invention provides a fixture for assembling an injection pen, including a fixture body and a clamping mechanism. The fixture body is provided with a receiving hole for placing the lower pen shell. The clamping mechanism is telescopically disposed on the fixture body and clamps the lower pen shell placed in the receiving hole. When it is necessary to insert the lower pen shell into the receiving hole or remove the assembled injection pen, the clamping mechanism is released under the action of external force.

[0005] Preferably, the clamping mechanism includes clamping blocks that are relatively spaced apart and can move along the main body of the fixture. A plurality of guide shafts are respectively inserted through the clamping blocks. One end of each guide shaft is connected to another clamping block, and a spring is sleeved on the other end of the guide shaft between the guide shaft and the clamping block it passes through. When an external force is applied to the end of the guide shaft that is not connected to the clamping block, the guide shaft drives the relatively spaced clamping blocks to move away from each other along the main body of the fixture, causing the two relatively spaced clamping blocks to be in a loose state. When the external force is lost, the clamping blocks move towards each other under the action of the spring force, and are in a clamping state.

[0006] Preferably, each of the two clamping blocks has an arc-shaped groove at one end. When the pen shell is inserted into the receiving hole and clamped by the clamping block, the outer periphery of the pen shell is located in the arc-shaped groove of the clamping block.

[0007] Preferably, the fixture body has an I-shaped structure, and a receiving hole is provided at the center of the fixture body, passing through the upper and lower ends of the fixture body, so that a gap is formed in the central area of ​​the vertical support plate of the fixture body, and the fixture body is mounted on the pad plate; a clamping block is respectively provided in the groove on the opposite sides of the fixture body, and a slide rail is provided at the bottom of the fixture body, and the clamping blocks are slidably disposed on the slide rail; the guide shaft passes through the vertical support plate, forming a partial space for inserting the lower pen shell between the two clamping blocks and the vertical support plate.

[0008] Preferably, a stepped hole is provided in the pad corresponding to the receiving hole, a positioning block is provided in the stepped hole, and a protruding positioning post is provided on the positioning block; when the pen shell is inserted into the fixture body, the bottom of the pen shell is inserted into the positioning post of the positioning block.

[0009] Preferably, an upper pen shell platform extending out of the fixture body is provided on the fixture body, and a through hole for inserting a lower pen shell is provided on the upper pen shell platform corresponding to the receiving hole, and an upper pen shell fixture for placing the upper pen shell is provided on one side of the through hole.

[0010] Preferably, the upper pen shell fixture is a block structure, and a through hole is provided on the upper pen shell fixture for placing the upper pen shell.

[0011] Preferably, at least two limiting protrusions are provided on the upper pen shell platform. The limiting protrusions are located in the through holes of the upper pen shell fixture. When the upper pen shell is placed in the through holes, the limiting protrusions are located at the ends of the upper pen shell.

[0012] Preferably, when the fixtures are arranged in a row, the receiving hole for placing the lower pen shell and the through hole for placing the upper pen shell are arranged in parallel and correspond one-to-one.

[0013] Preferably, the fixture serves as a carrier for the injection pen assembly equipment.

[0014] The injection pen assembly fixture of the present invention positions the inserted lower pen shell so that it is kept vertically placed.

[0015] Simultaneously, it can be used as an assembly carrier, allowing direct assembly of the PFS (Pre-Flush Mount) and upper pen shell on the fixture. When used as a carrier in an automated injection pen assembly device, the clamping mechanism can cooperate with the cylinder or other unlocking mechanism of the injection pen assembly device to apply external force to the guide shaft of the clamping block, causing the clamping block to loosen and facilitating the insertion of the lower pen shell. After the lower pen shell is inserted, the external force is released, and the clamping mechanism automatically clamps the lower pen shell under the spring force, achieving the positioning of the lower pen shell. When the assembled injection pen is removed, the external force is reapplied, causing the clamping mechanism to loosen again, and the injection pen can be removed by a material handling mechanism. Therefore, the fixture of this invention can serve as a carrier in an injection pen assembly device, improving the automation level of injection pen assembly.

[0016] By using the fixture of the present invention, the vertical positioning of the lower pen shell is ensured and the fixed position of the lower pen shell when used as the assembly base is ensured, thus avoiding the tilting of the lower pen shell and incomplete assembly during assembly. In particular, when the fixture is applied in an automatic assembly equipment for injection pens, the assembly quality of injection pens tends to be consistent, thereby improving assembly efficiency and assembly quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the fixture structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the explosive structure of the jig.

[0019] Figure 3 This is a schematic diagram of the unlocking mechanism.

[0020] Figure 4 This is a schematic diagram of the injection pen structure.

[0021] Figure label:

[0022] Fixture 16, Fixture body 18, Clamping block 19, Clamping block guide shaft 20, Spring 21, Upper pen shell fixture 22, Upper pen shell platform 23, Pressure plate 25, Cylinder 26, Bracket 27, Injection pen A, Lower pen shell 2, Upper pen shell 3, PFS 56, Screw 60, Flat plate structure 181, Vertical support plate 182, Pad plate 183, Positioning block 184. Detailed Implementation

[0023] Regarding the above technical solutions, preferred embodiments are now described in detail with reference to the figures.

[0024] The present invention provides a jig for assembling an injection pen, used to place and fix the lower pen shell, see [link / reference]. Figure 4The injection pen A includes a lower pen shell 2, an upper pen shell 3, and a PFS 56. During assembly, the lower pen shell 2 is first placed in a fixture with its open end facing upwards and then positioned so that the lower pen shell is set vertically. Then, the PFS is inserted vertically into the lower pen shell from above and pressed firmly. Finally, the upper pen shell is inserted vertically into the lower pen shell from above and pressed into the assembly position to form the injection pen.

[0025] The injection pen assembly jig of the present invention, see below. Figure 1 and Figure 2The fixture 16 comprises a fixture body 18, a clamping mechanism, an upper pen shell fixture 22, and an upper pen shell platform 23. The clamping mechanism includes clamping blocks 19, clamping block guide shafts 20, and springs 21. The fixture body 18 has vertically spaced flat plate structures 181, with vertical support plates 182 positioned between them. The flat plate structures 181 and the vertical support plates 182 form an I-shaped fixture body 18. Slide rails are located on the bottom flat plate structures on opposite sides of the vertical support plates. Clamping blocks 19 are positioned between the upper and lower flat plate structures on opposite sides of the vertical support plates, and are slidably mounted on the slide rails. An arc-shaped groove is provided on the end face of the clamping block 19 facing the vertical support plate 181. Circular through holes are provided on the upper and lower flat plate structures at positions corresponding to the vertical support plate 181, and corresponding gaps are provided on the support plate 181 at positions corresponding to the circular through holes. The clamping block 19 has a through hole for the clamping block guide shaft 20 to pass through. At one end of the clamping block 19 facing the vertical support plate 182, a blind hole is also provided for the end of the clamping block guide shaft 20 passing through the opposite clamping block 19. Correspondingly, a through hole for the clamping block guide shaft 20 is provided on the vertical support plate 182. The clamping block guide shaft 20, located on the same side of the vertical support plate, passes through the clamping block 19 and the vertical support plate 182 on the same side and enters the blind hole of the opposite clamping block 19. Then, a screw 60 is inserted from one side into the blind hole to tighten and position the clamping block guide shaft 20. A spring 21 is fitted onto the clamping block guide shaft 20, and the spring 21 abuts against the free end of the clamping block 19 and the clamping block guide shaft 20. Under the action of spring 21, the clamping blocks 19 abut against the opposite sides of the vertical support plate 181, forming a vertical receiving cavity between the two clamping blocks 19 and the vertical support plate, corresponding to the circular through holes of the upper and lower flat plate structures. The lower pen shell can be placed in the vertical receiving cavity, and under the action of elasticity, the clamping blocks 19 lock and fix the placed lower pen shell. A pad 183 is provided below the fixture body 18, and the flat plate structure at the bottom of the fixture body 18 is fixedly connected to the pad 183 by screws. A stepped hole is provided at the position of the circular through hole of the upper and lower flat plate structures on the pad 183. A positioning block 184 for inserting and positioning the lower pen shell is provided in the stepped hole. The positioning block 184 is nested in the stepped hole, and a vertical positioning post is provided on the end face of the positioning block 184 facing the lower pen shell. When the lower pen shell 2 is inserted from the top of the fixture body 18 into the circular through hole and into the stepped hole of the pad 183, the vertical positioning post is inserted into the end of the lower pen shell 2 to position it. At the same time, when the clamping block does not clamp the lower pen shell, it keeps the lower pen shell in a certain position, so that the bottom of the lower pen shell abuts against the stepped position of the stepped hole and the bottom does not wobble, providing sufficient support for subsequent assembly and maintaining the positioning of the assembly position during subsequent assembly.When the lower pen shell 2 is inserted, an external force is applied to the clamping block guide shafts 20 located on opposite sides of the vertical support plate 182. The clamping block guide shafts 20 push the clamping block 19 on the other side of the vertical support plate 182 along the slide rail away from the vertical support plate 182, allowing the lower pen shell 2 to be inserted. After insertion, the force applied to the clamping block guide shafts 20 is removed. Under the spring force, the clamping block 19 moves towards the vertical support plate, clamping the inserted lower pen shell 2 and locking it in place. The same procedure is followed when the lower pen shell needs to be removed.

[0026] An upper pen shell platform 23 is fixedly mounted on the main body 18 of the fixture. The upper pen shell platform 23 has a corresponding circular through hole at the circular through hole of the main body 18 for inserting a lower pen shell. An upper pen shell fixture 22 is mounted on the upper pen shell platform 23 on one side of the circular through hole for inserting the lower pen shell 2. A vertical through hole is formed in the upper pen shell fixture 22 for inserting an upper pen shell 3. At least two limiting protrusions are provided on the upper pen shell platform 23 at the position corresponding to the vertical through hole for inserting the upper pen shell. When the upper pen shell is inserted, the limiting protrusions are located in the hollow portion at the end of the upper pen shell, and the upper pen shell is positioned by the vertical through hole and the limiting protrusions.

[0027] In order to apply external force to the clamping mechanism of the fixture, an unlocking mechanism can be used to apply external force.

[0028] See Figure 3 The unlocking mechanism includes two spaced-apart brackets 27, a pressure plate 25, and a cylinder 26. A cylinder 26 is fixedly mounted on each bracket 27, and a pressure plate 25 is fixedly mounted on the extension / retraction end of each cylinder 26. In the unlocking mechanism configuration, one bracket 27 is positioned on the outer side of each of the clamping blocks of the fixture; that is, one bracket 27 is positioned on the outer side of each of the two opposing clamping blocks of the fixture. The pressure plate 25 is positioned corresponding to the end of the guide shaft of the clamping mechanism. When multiple fixtures are arranged in a row, the pressure plate 25 corresponds to the guide shafts of multiple fixtures. When an external force needs to be applied to the guide shaft of the clamping block, the cylinders 26 on both sides of the fixture act simultaneously, pushing the guide shafts 20 on both sides of the fixture toward the opposing clamping block 19 with the pressure plate 25. This causes the two clamping blocks to move in opposite directions, increasing the distance between them and loosening the clamping mechanism. This facilitates the insertion of the lower pen shell or the removal of the assembled injection pen. When the lower pen shell is inserted, the cylinders 26 act again to reset, the guide shaft loses its external force, and the clamping blocks move toward each other under the elastic force of the compressed spring, clamping the lower pen shell. Since the end face of the clamping block that clamps the lower pen shell is vertically set, applying clamping force evenly to the clamping blocks on both sides can keep the lower pen shell vertically positioned.

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