An injection mold for processing a barrel of a medical injection pen

Abstract

The utility model relates to a kind of injection mould for processing medical injection pen barrel, including upper mould frame and lower mould frame, upper mould core and lower mould core are installed between upper mould frame and lower mould frame, slide is installed in the left side of lower mould core on the upper end of lower mould frame, two inner cavity columns are arranged in one end of slide in parallel, the oil cylinder connected with the left side installation of slide other end of lower mould frame, power box is installed in the right side of the upper end of lower mould frame, two power shafts and power structure are installed in power box, threaded column is provided in one end of power shaft, the other end of power shaft is threadedly connected with power box side wall, one window core-pulling column is arranged in the below of each threaded column in lower mould core inside, two lower drive bases are installed in the bottom of lower mould frame, lower drive base upper end is obliquely slid with window core-pulling column, the lower end of upper mould core is provided with the plug block inserted between two lower drive bases.

Description

Technical Field

[0001] This utility model relates to the field of medical injection pen technology, and in particular to an injection mold for processing the pen barrel of a medical injection pen. Background Technology

[0002] A syringe is a common medical device, mainly used for injecting or drawing fluids. An injection pen is a type of syringe mainly used for injecting small amounts of drugs, such as insulin and adrenaline. Patients who need to inject insulin or adrenaline should inject the drugs according to the prescribed dosage.

[0003] The pen holder is the outer shell structure of the injection pen, such as... Figure 8 As shown, the injection pen holder includes a pen holder body 38, which is cylindrical in shape. The inner wall of the pen holder body 38 is provided with internal threads 39, and a window 40 is opened at the lower part of the pen holder body 38. Due to the presence of internal threads 39, window 40 and other structures, the pen holder body 38 is complex in its overall structure. Conventional injection molds cannot achieve the molding and demolding of the product. Therefore, it is necessary to design a mold specifically for the injection pen holder. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an injection mold for processing medical injection pen barrels, which can assist in forming complex structures such as internal threads and windows, and can realize the demolding of the above-mentioned complex structures, thus facilitating product processing and manufacturing.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: An injection mold for processing medical injection pen barrels is provided, including an upper mold frame and a lower mold frame. An upper mold core and a lower mold core are stacked vertically between the upper and lower mold frames, and a mold cavity is provided between the upper and lower mold cores. A laterally sliding slide is installed on the upper end of the lower mold frame, located to the left of the lower mold core. Two internal cavity pillars are arranged side-by-side on one end of the slide, and the other end of the slide is connected to a hydraulic cylinder installed on the left side of the lower mold frame. A power box is installed on the right side of the upper end of the lower mold frame. The power box contains two power shafts and a power structure for driving the two power shafts to rotate. One end of the power shaft is provided with a threaded post that mates with the corresponding inner cavity post, and the other end of the power shaft is threadedly connected to the side wall of the power box. Inside the lower mold core, below each threaded post, there is a window core-pulling post that slides up and down. Inside the bottom of the lower mold frame, there are two relatively sliding lower drive seats and a spring that assists in the reset of the lower drive seats. The two lower drive seats are arranged symmetrically front and back. The upper end of the lower drive seat slides obliquely with the corresponding window core-pulling post. The upper end of the lower drive seat is provided with an oblique guide groove. The lower end of the upper mold core is provided with an insert block that inserts between the two lower drive seats. The front and rear sides of the insert block are provided with guide protrusions that match the oblique guide groove.

[0006] As a supplement to the technical solution described in this utility model, a mold foot is installed on each side of the lower end of the lower mold frame, and a top plate assembly that moves up and down is installed between the two mold feet. Multiple ejector pins that are inserted into the mold cavity are vertically arranged on the top plate assembly.

[0007] As a supplement to the technical solution described in this utility model, a lower template is installed at the lower end of the two mold feet, and two auxiliary support rods are fixed side by side on the lower template. The upper end of the auxiliary support rod passes through the top plate assembly, the lower mold frame and the lower mold core from bottom to top and is inserted into the mold cavity. A through hole is opened on the side of the upper end of the auxiliary support rod for the inner cavity column to pass through.

[0008] As a supplement to the technical solution described in this utility model, a forming block is installed on the upper end of the lower mold frame, located on the right side of the lower mold core. Two power shafts of the threaded column pass through the forming block. The threaded column is located on the left side of the forming block. An end forming surface is provided around each threaded column on the left side of the forming block. A driving groove is vertically opened on both the front and rear sides of the forming block. The right side wall of the driving groove is provided with a first vertical surface, a first inclined surface, and a second vertical surface connected sequentially from bottom to top. The left side wall of the driving groove is a third vertical surface. The distance between the first vertical surface and the third vertical surface is greater than the distance between the second vertical surface and the third vertical surface. A driving rod that slides up and down is installed inside the driving groove. The lower end of the driving rod is fixed to the top plate assembly, and the upper part of the driving rod is matched with the driving groove.

[0009] As a supplement to the technical solution described in this utility model, the upper part of the drive rod is elongated, the left side wall of the drive rod is the fourth vertical surface, and the right side wall of the drive rod is provided with a fifth vertical surface, a second inclined surface and a sixth vertical surface connected from bottom to top. The distance between the fourth vertical surface and the fifth vertical surface is greater than the distance between the fourth vertical surface and the sixth vertical surface.

[0010] As a supplement to the technical solution described in this utility model, the power structure includes a rack and a driven gear. A driven gear is sleeved on each power shaft. An active gear that meshes with two driven gears is installed inside the power box. A drive gear is coaxially arranged on the outer side of the active gear. A vertically arranged rack is installed on the right side of the upper mold frame, and the rack cooperates with the drive gear.

[0011] As a supplement to the technical solution described in this utility model, the bottom of the lower mold frame is provided with a recess to accommodate two lower drive seats, and the recess is sealed by a cover plate.

[0012] Beneficial effects: This utility model relates to an injection mold for processing medical injection pen barrels. After the product is formed, the mold is opened, and the rack on the right side of the upper mold frame controls the drive gear to rotate in the opposite direction, so that the two threaded pillars are screwed out of their respective formed products, realizing the demolding of the threaded pillars from the internal threads of the pen barrel body. At the same time, the insert block at the lower end of the upper mold core is pulled out, and the two lower drive seats are reset by springs. The two lower drive seats move closer to each other, and the lower drive seats drive the window core pull column to slide downward. The upper end of the window core pull column separates from the product, realizing the demolding of the product window position. Attached Figure Description

[0013] Figure 1 This is a sectional view of the present invention from the main viewing direction;

[0014] Figure 2 This is a schematic diagram of the structure of the upper mold frame and the upper mold core described in this utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the lower mold frame and the lower mold core described in this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of this utility model after removing the upper mold frame, lower mold frame, lower mold core, lower mold frame and lower template;

[0017] Figure 5 This is a schematic diagram of the structure of the two lower drive seats of this utility model;

[0018] Figure 6 This is a schematic diagram of the structure of the molding block described in this utility model;

[0019] Figure 7 This is a schematic diagram of the structure of the drive rod described in this utility model;

[0020] Figure 8 This is a structural diagram of the product manufactured under this utility model.

[0021] Diagram: 1. Upper mold frame, 2. Lower mold frame, 3. Lower mold core, 4. Lower mold frame, 5. Hydraulic cylinder, 6. Slide block, 7. Inner cavity pillar, 8. Threaded pillar, 9. Power shaft, 10. Power box, 11. Rack, 12. Lower drive seat, 13. Mold foot, 14. Top plate assembly, 15. Lower template, 16. Auxiliary support rod, 17. Cover plate, 18. Window core-pulling pillar, 19. Driven gear, 20. Drive gear, 21. Drive gear, 22. 23. Molding block, 24. Drive rod, 25. Insert block, 26. Guide protrusion, 27. Inclined guide groove, 28. Inclined sliding groove, 29. End molding surface, 30. Drive groove, 31. First vertical surface, 32. First inclined surface, 33. Second vertical surface, 34. Third vertical surface, 35. Fourth vertical surface, 36. Fifth vertical surface, 37. Second inclined surface, 38. Sixth vertical surface, 39. Pen holder body, 40. Internal thread, 51. Window. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0023] The present invention relates to an injection mold for processing medical injection pen barrels, such as... Figure 1-8 As shown, the system includes an upper mold frame 1 and a lower mold frame 4. An upper mold core 2 and a lower mold core 3, stacked vertically, are installed between the upper mold frame 1 and the lower mold frame 4. A mold cavity is provided between the upper mold core 2 and the lower mold core 3. A laterally sliding slide 6 is installed on the upper end of the lower mold frame 4, located to the left of the lower mold core 3. Two internal cavity pillars 7 are arranged side-by-side on one end of the slide 6. The other end of the slide 6 is connected to a hydraulic cylinder 5 installed on the left side of the lower mold frame 4. A power box 10 is installed on the upper right side of the lower mold frame 4. The power box 10 contains two power shafts 9 and a power structure for driving the two power shafts 9 to rotate. One end of each power shaft 9 has a threaded post that mates with the corresponding internal cavity pillar 7. 8. The other end of the power shaft 9 is threaded to the side wall of the power box 10. Inside the lower mold core 3, there is a sliding window core pull column 18 located below each threaded column 8. Inside the bottom of the lower mold frame 4, there are two relatively sliding lower drive seats 12 and a spring to assist the lower drive seats 12 in resetting. The two lower drive seats 12 are symmetrically arranged front and back. The upper end of the lower drive seat 12 slides obliquely with the corresponding window core pull column 18. The upper end of the lower drive seat 12 is provided with an oblique guide groove 26. The lower end of the upper mold core 2 is provided with an insert block 24 that inserts between the two lower drive seats 12. The front and rear sides of the insert block 24 are provided with guide protrusions 25 that match the oblique guide groove 26.

[0024] Reference Figure 5 As shown, the lower drive seat 12 has an inclined sliding groove 27 on the outer side and an inclined guide groove 26 on the inner side. The lower end of the window core pull column 18 slides obliquely along the inclined sliding groove 27. The inclined sliding groove 27 and the inclined guide groove 26 are arranged in a figure-eight shape.

[0025] The lower mold frame 4 has a mold foot 13 installed on each side of its lower end, and a top plate assembly 14 that moves up and down is installed between the two mold feet 13. The top plate assembly 14 has multiple ejector pins that are inserted into the mold cavity.

[0026] The lower ends of the two mold feet 13 are equipped with lower templates 15. Two auxiliary support rods 16 are fixed side by side on the lower templates 15. The upper ends of the auxiliary support rods 16 pass through the top plate assembly 14, the lower mold frame 4 and the lower mold core 3 from bottom to top and are inserted into the mold cavity. The upper side of the auxiliary support rods 16 is provided with a through hole for the inner cavity column 7 to pass through. The through hole at the upper part of the auxiliary support rods 16 is used to support the inner cavity column 7 to ensure the stability of the lateral sliding of the inner cavity column 7 and reduce the risk of deformation of the inner cavity column 7.

[0027] A forming block 22 is installed on the upper end of the lower mold frame 4, located on the right side of the lower mold core 3. Two power shafts 9 of the threaded column 8 pass through the forming block 22. The threaded column 8 is located on the left side of the forming block 22. An end forming surface 28 is provided around each threaded column 8 on the left side of the forming block 22. A driving groove 29 is vertically opened on both the front and rear sides of the forming block 22. The right side wall of the driving groove 29 is connected from bottom to top with a first vertical surface 30, a first inclined surface 31, and a second vertical surface 32. The left side wall of the driving groove 29 is a third vertical surface 33. The distance between the first vertical surface 30 and the third vertical surface 33 is greater than the distance between the second vertical surface 32 and the third vertical surface 33. A driving rod 23 that slides up and down is installed inside the driving groove 29. The lower end of the driving rod 23 is fixed to the top plate assembly 14, and the upper part of the driving rod 23 is matched with the driving groove 29.

[0028] The upper part of the drive rod 23 is elongated. The left side wall of the drive rod 23 is the fourth vertical surface 34. The right side wall of the drive rod 23 is also connected from bottom to top with the fifth vertical surface 35, the second inclined surface 36 and the sixth vertical surface 37. The distance between the fourth vertical surface 34 and the fifth vertical surface 35 is greater than the distance between the fourth vertical surface 34 and the sixth vertical surface 37.

[0029] After the product is formed, the mold opens, the top plate assembly 14 controls the drive rod 23 to move upward, the second inclined surface 36 of the drive rod 23 presses the first inclined surface 31 of the drive groove 29, causing the forming block 22 to slide to the right, so that the end forming surface 28 is separated from the product.

[0030] As an explanation of the power structure, the power structure includes a rack 11 and driven gears 19. Each power shaft 9 is fitted with a driven gear 19. The power box 10 is equipped with a driving gear 20 that meshes with the two driven gears 19. A drive gear 21 is coaxially arranged on the outer side of the driving gear 20. A vertically arranged rack 11 is installed on the right side of the upper mold frame 1. The rack 11 cooperates with the drive gear 21. The driving gear 20 and the two driven gears 19 can mesh directly or indirectly through gear set transmission.

[0031] The bottom of the lower mold frame 4 is provided with a recess to accommodate two lower drive seats 12, which is sealed by a cover plate 17. The cover plate 17 is fixed to the bottom of the lower mold frame 4 with fasteners. The recess at the bottom of the lower mold frame 4 facilitates the installation of the lower drive seats 12 and the cover plate 17, and also facilitates the later maintenance of components.

[0032] The upper mold frame 1 and upper mold core 2 close with the lower mold frame 4 and lower mold core 3. The rack 11 on the right side of the upper mold frame 1 controls the drive gear 21 to rotate downwards. The drive gear 21 drives the driving gear 20 to rotate together. The driving gear 20 drives the two driven gears 19 to rotate. The two driven gears 19 each drive the corresponding power shaft 9. Since the right end of the power shaft 9 is threaded to the right side wall of the power box 10, the rotation of the power shaft 9 will control the rotation of the threaded column 8 and make one end of the threaded column 8 mate with the inner cavity column 7. At the same time, the insert 24 at the lower end of the upper mold core 2 is inserted between the two lower drive seats 12. The guide protrusions 25 on both sides of the insert 24 are inserted into the inclined guide grooves 26 of the two lower drive seats 12, forcing the two lower drive seats 12 to move away from each other. The lower drive seats 12 drive the window core-pulling column 18 to slide upwards. The upper end of the window core-pulling post 18 is connected to the threaded post 8. Then, molten plastic material is injected into the mold cavity. After the product is formed, the mold is opened. The rack 11 on the right side of the upper mold frame 1 controls the drive gear 21 to rotate in the opposite direction, so that the two threaded posts 8 are screwed out of their respective formed products. At the same time, the insert block 24 at the lower end of the upper mold core 2 is pulled out. The two lower drive seats 12 are reset by springs and move closer to each other. The lower drive seats 12 drive the window core-pulling post 18 to slide downward. The upper end of the window core-pulling post 18 is separated from the product. Then, the oil cylinder 5 controls the slide block 6 to slide to the left, and the two inner cavity posts 7 are separated from the product. Finally, the top plate assembly 14 controls the ejector pin and the drive rod 23 to move upward. The drive rod 23 drives the forming block 22 to slide to the right, so that the end forming surface 28 is separated from the product, and the ejector pin ejects the formed product.

[0033] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0036] The above provides a detailed description of an injection mold for processing medical injection pen barrels. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An injection mold for processing a medical injection pen barrel, comprising an upper mold frame (1) and a lower mold frame (4), wherein an upper mold core (2) and a lower mold core (3) stacked vertically are installed between the upper mold frame (1) and the lower mold frame (4), and a mold cavity is provided between the upper mold core (2) and the lower mold core (3), characterized in that: The lower mold frame (4) is equipped with a horizontally sliding slide (6) on the left side of the lower mold core (3). Two inner cavity pillars (7) are arranged side by side on one end of the slide (6). The other end of the slide (6) is connected to the oil cylinder (5) installed on the left side of the lower mold frame (4). A power box (10) is installed on the right side of the upper end of the lower mold frame (4). The power box (10) contains two power shafts (9) and a power structure for driving the two power shafts (9) to rotate. One end of the power shaft (9) is provided with a threaded pillar (8) that mates with the corresponding inner cavity pillar (7). The other end of the power shaft (9) is threadedly connected to the side wall of the power box (10). The lower mold core (3) Inside, below each threaded post (8), there is a sliding window core pull post (18). Inside the bottom of the lower mold frame (4), there are two relatively sliding lower drive seats (12) and a spring to assist the lower drive seats (12) in resetting. The two lower drive seats (12) are arranged symmetrically front and back. The upper end of the lower drive seat (12) slides obliquely with the corresponding window core pull post (18). The upper end of the lower drive seat (12) is provided with an oblique guide groove (26). The lower end of the upper mold core (2) is provided with a plug (24) that is inserted between the two lower drive seats (12). The front and rear sides of the plug (24) are provided with guide protrusions (25) that match the oblique guide groove (26).

2. The injection mold for processing medical injection pen holders according to claim 1, characterized in that: The lower mold frame (4) has a mold foot (13) installed on each side of its lower end. A top plate assembly (14) that moves up and down is installed between the two mold feet (13). Multiple ejector pins that are inserted into the mold cavity are vertically arranged on the top plate assembly (14).

3. The injection mold for processing medical injection pen holders according to claim 2, characterized in that: The lower ends of the two mold feet (13) are equipped with a lower template (15). Two auxiliary support rods (16) are fixed side by side on the lower template (15). The upper ends of the auxiliary support rods (16) pass through the top plate assembly (14), the lower mold frame (4) and the lower mold core (3) from bottom to top and are inserted into the mold cavity. The upper side of the auxiliary support rods (16) is provided with a through hole for the inner cavity column (7) to pass through.

4. The injection mold for processing medical injection pen holders according to claim 2, characterized in that: The upper end of the lower mold frame (4) is located on the right side of the lower mold core (3) and a forming block (22) is installed. The two power shafts (9) of the threaded column (8) pass through the forming block (22). The threaded column (8) is located on the left side of the forming block (22). The left side of the forming block (22) is provided with an end forming surface (28) around each threaded column (8). A driving groove (29) is vertically opened on both the front and rear sides of the forming block (22). The right side wall of the driving groove (29) is connected from bottom to top with a first vertical The drive groove (29) has a straight surface (30), a first inclined surface (31), and a second vertical surface (32). The left side wall of the drive groove (29) is a third vertical surface (33). The distance between the first vertical surface (30) and the third vertical surface (33) is greater than the distance between the second vertical surface (32) and the third vertical surface (33). The drive groove (29) is equipped with a drive rod (23) that slides up and down. The lower end of the drive rod (23) is fixed to the top plate assembly (14), and the upper part of the drive rod (23) is matched with the drive groove (29).

5. The injection mold for processing medical injection pen holders according to claim 4, characterized in that: The upper part of the drive rod (23) is long and narrow. The left side wall of the drive rod (23) is the fourth vertical surface (34). The right side wall of the drive rod (23) is connected from bottom to top with the fifth vertical surface (35), the second inclined surface (36) and the sixth vertical surface (37). The distance between the fourth vertical surface (34) and the fifth vertical surface (35) is greater than the distance between the fourth vertical surface (34) and the sixth vertical surface (37).

6. The injection mold for processing medical injection pen barrels according to claim 1, characterized in that: The power structure includes a rack (11) and driven gears (19). Each power shaft (9) is fitted with a driven gear (19). The power box (10) is equipped with a drive gear (20) that meshes with the two driven gears (19). A drive gear (21) is coaxially arranged on the outside of the drive gear (20). A vertically arranged rack (11) is installed on the right side of the upper mold frame (1). The rack (11) cooperates with the drive gear (21).

7. The injection mold for processing medical injection pen holders according to claim 1, characterized in that: The bottom of the lower mold frame (4) is provided with a recess to accommodate two lower drive seats (12), and the recess is sealed by a cover plate (17).

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