Press fitting structure for injection pen assembly

Abstract

The present application relates to the field of injection pen automatic assembly, specifically refers to a kind of injection pen assembly with press fitting structure, including support, press fitting structure is installed on the support, the press fitting structure is arranged in PFS press fitting station and upper pen shell press fitting station respectively;The press fitting structure includes at least one set of linear displacement linear transmission module, a pressure head is installed on the linear transmission module, the pressure head corresponds to the lower pen shell placed on the assembly jig used for injection pen assembly;When press fitting, the linear transmission module is linearly displaced with the pressure head towards the direction of assembly jig, the pressure head pushes the PFS or upper pen shell placed on the lower pen shell on the assembly jig to be displaced towards the direction of lower pen shell, and press fitting is carried out.It is ensured that press fitting is in place, and production efficiency and product yield are improved.

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 press-fit structure for assembling injection pens. Background Technology

[0002] Currently, the assembly process for injection pens is quite 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, then assembling the upper pen housing onto the lower pen housing, and finally pressing the upper and lower pen housings together tightly. Because the assembly of injection pens is entirely manual, problems such as the PFS or upper pen housing not being pressed into place and low assembly efficiency frequently occur. Summary of the Invention

[0003] The purpose of this invention is to provide a press-fit structure for assembling injection pens, which presses the PFS or upper pen shell to the required assembly position, avoiding improper press-fitting and improving work efficiency and assembly quality.

[0004] To solve the above-mentioned technical problems, the present invention provides a pressing structure for an injection pen assembly device, including a bracket, on which a pressing structure is mounted. The pressing structure is respectively disposed at the PFS pressing station and the upper pen shell pressing station; wherein:

[0005] The press-fitting structure includes at least one set of linearly displaceable linear transmission modules, on which press heads are installed. The press heads correspond to the lower pen shell placed on the assembly fixture for assembling the injection pen.

[0006] During press fitting, the linear drive module moves the press head linearly toward the assembly fixture, and the press head pushes the PFS or upper pen shell placed on the lower pen shell of the assembly fixture to move toward the lower pen shell, thus performing press fitting.

[0007] Preferably, a pressure gauge is fixedly installed on the linear transmission module, and the pressure head is connected to the pressure gauge.

[0008] Preferably, the linear transmission module is a lead screw module capable of linear displacement, the lead screw module is driven by a motor mounted on the bracket, and a pressure gauge is mounted on the nut block of the lead screw module.

[0009] Preferably, when the pressing structure is set in the PFS pressing station, the pressing head has a pointed structure and a step is provided on the outer periphery of the pointed structure. When the pressing head contacts the PFS, the head of the pointed structure enters the hollow part of the PFS, and the step on the outer periphery of the pointed structure abuts against the end of the PFS, forming a position limiting and working surface.

[0010] Preferably, when the pressing structure is set in the upper pen shell pressing station, the end of the pressing head facing the upper pen shell has a planar structure.

[0011] Preferably, the assembly fixture is mounted on the mover of the magnetic drive toroidal line, and the assembly fixture moves between various workstations via the mover of the magnetic drive toroidal line.

[0012] Preferably, the assembly fixture includes a fixture body, a clamping mechanism, and an upper pen shell fixture. 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 for clamping the lower pen shell inserted into the receiving hole. The upper pen shell fixture is disposed on the fixture body on one side of the receiving hole for placing the lower pen shell.

[0013] Preferably, the clamping mechanism includes clamping blocks, clamping block guide shafts, and springs. The fixture body has an I-shaped structure. Clamping blocks are slidably disposed in grooves on opposite sides of the fixture body. The clamping block guide shaft passes through one clamping block and connects to the other clamping block. The spring passes through the clamping block guide shaft, with one end abutting against the end of the clamping block guide shaft and the other end abutting against the clamping block through which it passes. The spring is in a compressed state. Through holes for accommodating the lower pen shell are respectively opened from the upper end to the lower end of the fixture body. The through holes and the two clamping blocks combine to form accommodating holes for accommodating the lower pen shell.

[0014] The press-fit structure of the injection pen assembly equipment of the present invention, when placing the pre-filled spectrometer (PFS) onto the lower pen shell via the feeding module or placing the upper pen shell onto the lower pen shell after PFS assembly via the feeding module and the upper pen shell pre-assembly module, presses the PFS or upper pen shell into the correct assembly position of the lower pen shell through the pressing structure, avoiding defects such as improper manual assembly or tilting. The press-fit structure ensures consistent assembly quality of the injection pens, improving assembly efficiency and quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the press-fit structure.

[0016] Figure 2 This is a schematic diagram of the overall structure of the assembly fixture.

[0017] Figure 3 This is an exploded structural diagram of the assembly fixture.

[0018] Figure 4 This is a schematic diagram of the unlocking mechanism.

[0019] Figure 5 This is a schematic diagram of the injection pen structure.

[0020] Figure label:

[0021] Assembly 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, bracket 41, lead screw module 42, motor 43, pressure gauge 44, pressure head 45, injection pen A, lower pen shell 2, upper pen shell 3, PFS 56, screw 60, flat plate structure 181, vertical support plate 182, pad 183, positioning block 184. Detailed Implementation

[0022] Regarding the above technical solutions, preferred embodiments are now described in detail with reference to the figures.

[0023] The press-fitting structure of the injection pen assembly equipment of the present invention is shown in the figure. Figure 5 The injection pen A includes a lower pen shell 2, an upper pen shell 3, and a PFS56. During assembly, the PFS56 is assembled in the lower pen shell 2, and then the PFS is pressed into the assembly position in the lower pen shell by press fitting. The upper pen shell 3 is then placed on the lower pen shell 3 after the PFS is assembled, and the upper pen shell is pressed tightly into the assembly position of the lower pen shell by press fitting, thus completing the assembly and forming the injection pen.

[0024] The press-fitting structure of the injection pen assembly equipment of the present invention is shown in the figure. Figure 1 The system includes a support 41, a linear rotation module, a motor 43, a pressure gauge 44, and a pressure head 45. In this example, the linear transmission module is a lead screw module 42; in some embodiments, a Z-axis linear module can also be used. Using the lead screw module 42 ensures precise displacement distance control and stable output torque.

[0025] A bracket 41 is positioned on one side of the displacement path of the assembly fixture 16. A lead screw module 42 is positioned on the side of the bracket 41 facing the displacement path of the assembly fixture. The number of lead screw modules 42 corresponds to the number of assembly fixtures 16. Each lead screw module 42 generally includes a rotatable lead screw and a nut block threaded onto the lead screw. As the lead screw rotates, the nut block moves linearly along the lead screw. A motor 43 for driving the lead screw rotation is positioned above the lead screw module 42 and is fixedly mounted on the bracket 41. A pressure gauge 44 is fixedly connected to the nut block of the lead screw module 42, and a pressure head 45 is connected to the lower end of the pressure gauge 44. The pressure gauge 44 and pressure head 45 are located at the lower end of the lead screw module. The linear displacement of the lead screw module causes the pressure gauge 44 and pressure head 45 to move vertically. The pressure head 45 corresponds to either a PFS56 placed on the lower pen shell 2 on the assembly fixture 16 or an upper pen shell placed on the lower pen shell 2. When pressing the PFS (Pencil Frame), the press head 45 has a pointed structure with a limiting step on its outer periphery. When the press head 45 presses downward, the pointed part of the press head 45 inserts into the hollow part at the upper end of the PFS 56, and the limiting step of the press head 45 abuts against the upper end face of the PFS. The limiting step applies force to the end face of the PFS, pressing the PFS into the assembly position in the lower pen shell. When pressing the upper pen shell, the end of the press head 45 facing the upper pen shell is designed as a flat structure.

[0026] Taking the press-fit PFS as an example: When the assembly fixture 16 moves the PFS placed on the lower pen shell to the PFS press-fit module, the motor 43 drives the lead screw module 42 to move. The lead screw of the lead screw module moves the pressure head 45 toward the PFS56 on the assembly fixture 16 and contacts the PFS56, driving the PFS56 to press into the interior of the lower pen shell 2. During the pressing process of the pressure head 45 pressing the PFS, the pressure gauge 44 detects the pressure. When the pressure reaches the design requirement, it means that the press-fit is in place. The motor 43 stops and then reverses. The lead screw module 42 moves the pressure head 45 up and resets, completing the press-fit of one batch of PFS56, waiting for the arrival of the next batch of assembly fixtures. The assembly fixture that has completed the press-fit of PFS56 continues to move to the next station.

[0027] Assembly fixture 16 is moved between various workstations via a conveying device for loading and assembly. The conveying device, such as a magnetic drive circular line, has several movers on it, and at least one assembly fixture 16 is mounted on each mover. During operation, as the magnetic drive circular line rotates, the movers 14 carry the assembly fixture 16 and move sequentially with each workstation to achieve cyclical automatic assembly.

[0028] Assembly jig 16, see Figures 2 to 3The fixture consists of a main 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 main body 18 has two plate structures 181 spaced vertically, with a vertical support plate 182 positioned between them. The plate structures 181 and the vertical support plate 182 form an I-shaped fixture body 18. Slide rails are located on the bottom plate structures on opposite sides of the vertical support plate. Clamping blocks 19 are positioned between the upper and lower plate structures on opposite sides of the vertical support plate, slidingly 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 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 is provided in the stepped hole for the lower pen shell to be inserted and positioned. 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.When the lower pen shell 2 is inserted, the unlocking mechanism applies external force 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 unlocking mechanism resets, removing the force applied to the clamping block guide shafts 20. Under the action of elasticity, the clamping mechanism clamps the inserted lower pen shell 2, locking it in place. The same procedure is followed when the lower pen shell needs to be removed.

[0029] See Figure 4 The unlocking mechanism includes a bracket 27, a pressure plate 25, and a cylinder 26. The magnetic drive ring module 4 has brackets 27 on opposite sides. A cylinder 26 is fixedly mounted on the bracket 27, and a pressure plate 25 is fixedly mounted on the extension end of the cylinder 26. The pressure plate 25 is located on the outer side of the bracket 27 facing the mover 14. When the mover 14, carrying the carrier 15, moves to the unlocking mechanism, the cylinder 26 actuates, driving the pressure plate 25 to move towards the mover 14. From opposite sides of the fixture 16, the pressure plates 25 respectively press against the clamping block guide shaft 20 located on the same side, causing the clamping blocks 19 to move towards the pressure plate under the force of the pressure plate 25, thus releasing the lower pen shell 2 and unlocking it.

[0030] 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.

[0031] During operation, the lower and upper pen shells are placed on the assembly fixture at their respective positions using the loading modules at the lower and upper pen shell loading stations. The PFS (Pencil File System) is then placed on the lower pen shell on the assembly fixture 16 using the loading module at the PFS loading station. The PFS is then pressed into the lower pen shell using the pressing head of the pressing structure at the PFS pressing station. The upper pen shell, placed on the assembly fixture, is then moved onto the lower pen shell using the loading module at the upper pen shell pre-assembly station. Finally, the upper pen shell is pressed into the lower pen shell using the pressing structure at the upper pen shell pressing station, completing the assembly.

[0032] The loading module uses a Y-axis linear module in conjunction with a Z-axis linear module. A gripping cylinder is installed on the Z-axis linear module. Through the horizontal and vertical linear displacement of the Y-axis linear module and the Z-axis linear module, the lower pen shell, upper pen shell, and PFS are transported from their corresponding positions to their corresponding positions on the assembly fixture.

[0033] The press head in the above-mentioned press-fitting structure is set one-to-one with the lower pen shell placed on the assembly fixture. One can be set, or...

[0034] Multiple units are arranged in rows to improve assembly efficiency.

[0035] The operation of each of the above modules is controlled by an electronic control module, which is a microcontroller.

Claims

1. A press-fit structure for assembling an injection pen, characterized in that, The system includes a bracket on which pressing structures are mounted. These pressing structures are respectively located at the PFS pressing station and the upper pen shell pressing station; wherein: The press-fitting structure includes at least one set of linearly displaceable linear transmission modules, on which press heads are installed. The press heads correspond to the lower pen shell placed on the assembly fixture for assembling the injection pen. The assembly fixture includes a fixture body, a clamping mechanism, and an upper pen shell fixture. The fixture body is provided with a receiving hole for placing the lower pen shell. The clamping mechanism is telescopically mounted on the fixture body for clamping the lower pen shell inserted into the receiving hole. The upper pen shell fixture is mounted on the fixture body on one side of the receiving hole for placing the lower pen shell. The clamping mechanism includes clamping blocks, clamping block guide shafts, and springs. The fixture body has an I-shaped structure. Clamping blocks are slidably disposed in grooves on opposite sides of the fixture body. The clamping block guide shaft passes through one clamping block and connects to the other clamping block. The spring passes through the clamping block guide shaft, with one end abutting against the end of the clamping block guide shaft and the other end abutting against the clamping block through which it passes. The spring is in a compressed state. Through holes for accommodating the lower pen shell are respectively opened from the upper end to the lower end of the fixture body. The through holes and the two clamping blocks combine to form accommodating holes for accommodating the lower pen shell. During press fitting, the linear drive module moves the press head linearly toward the assembly fixture, and the press head pushes the PFS or upper pen shell placed on the lower pen shell of the assembly fixture to move toward the lower pen shell, thus performing press fitting.

2. The press-fit structure according to claim 1, characterized in that, A pressure gauge is fixedly installed on the linear transmission module, and the pressure head is connected to the pressure gauge.

3. The press-fitting structure according to claim 2, characterized in that, The linear transmission module is a lead screw module capable of linear displacement. The lead screw module is driven by a motor mounted on the bracket, and a pressure gauge is mounted on the nut block of the lead screw module.

4. The press-fit structure according to claim 1, characterized in that, When the pressing structure is set in the PFS pressing station, the pressing head has a pointed structure and a step is provided on the outer periphery of the pointed structure. When the pressing head contacts the PFS, the head of the pointed structure enters the hollow part of the PFS, and the step on the outer periphery of the pointed structure abuts against the end of the PFS, forming a position limiting and working surface.

5. The press-fitting structure according to claim 1, characterized in that, When the pressing structure is set in the upper pen shell pressing station, the end of the pressing head facing the upper pen shell has a planar structure.

6. The press-fit structure according to claim 1, characterized in that, The assembly fixture is mounted on the mover of the magnetic drive loop, and the assembly fixture can be moved between various workstations via the mover of the magnetic drive loop.

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