Inverted drilling button injection mold

Abstract

The utility model provides a reverse drilling button injection mold which comprises an upper mold and a lower mold, and the upper mold is matched with the lower mold; wherein the upper die comprises a top plate, an upper die frame and an upper die core, the top plate is arranged at the upper part of the upper die frame, and the upper die core is embedded in the upper die frame; wherein the lower mold comprises a lower mold frame, a lower mold core and a mold foot plate, the lower mold core is embedded in the lower mold frame, the lower mold frame is arranged on the mold foot plate, the lower mold core is provided with at least two injection mold cavities, the upper mold core is provided with a mold cavity plugging block, and the mold cavity plugging block is matched with the injection mold cavities; and the mold cavity plugging block is matched with the injection mold cavity to form a closed cavity. The utility model provides a reverse drilling button injection mold which is simple in structure, reasonable in design, high in automation degree, good in forming effect, convenient and quick to demold, not easy to damage products, high in cooling and demolding speed and capable of improving the injection production efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molding equipment, in particular to an injection mold for a reverse-drilled button. Background Art

[0002] A back-drill drill penetrates bone tissue through a guide drill. Current back-drills have become increasingly versatile, but in order to facilitate manipulation and achieve multiple functions, the back-drill, as a sophisticated medical device, is typically only equipped with a button to control various functions, and the button needs to be mounted on the back-drill. Therefore, the button on the current back-drill is more complex for achieving control of various functions. Existing injection molds are complex buttons that require a complex injection mold cavity design. Due to their complex structure, demoulding is also difficult. For example, if a through hole needs to be formed on a product, a rod needs to be provided to cross the injection mold cavity. This rod needs to be removed after the injection molding is complete. However, when the rod is removed from one side, the product is easily deformed by force, affecting product quality. Additionally, common ejectors can easily cause damage to the product during ejection, potentially rendering the product useless.

[0003] Therefore, the above problems have become technical problems that need to be solved urgently. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a reverse drill button injection mold, which has a simple structure, reasonable design, high degree of automation, good molding effect, convenient and quick demoulding, not easy to damage the product, fast cooling and demoulding speed, and improves the injection molding production efficiency.

[0005] Technical solution: In order to achieve the above purpose, the utility model provides an inverted drill button injection mold, including an upper mold and a lower mold, the upper mold and the lower mold cooperate;

[0006] Wherein, the upper mold includes a top plate, an upper mold frame and an upper mold core, the top plate is arranged on the upper part of the upper mold frame, and the upper mold core is embedded in the upper mold frame;

[0007] The lower mold comprises a lower mold frame, a lower mold core and a mold foot plate. The lower mold core is embedded in the lower mold frame, and the lower mold frame is mounted on the mold foot plate. The lower mold core is provided with at least two injection mold cavities. The upper mold core is provided with a mold cavity blocking block, and the mold cavity blocking block cooperates with the injection mold cavity; the mold cavity blocking block cooperates with the injection mold cavity to form a closed cavity.

[0008] The lower mold core is equipped with sliders on both sides, which are slidably mounted on the lower mold frame. A set of plungers are mounted on the sliders. The plungers are inserted into the injection mold cavity and can be pulled out of the mold cavity by the sliders. During mold closing and injection molding, the plungers on both sides dock within the mold cavity. After the injection molding is completed, a through hole is formed on the side of the product. The structure is simple and practical.

[0009] Furthermore, the slider is provided with an oblique hole, and the upper mold frame is provided with a guide rod obliquely positioned thereon. The guide rod engages the oblique hole, and the bottom of the upper mold frame is also provided with a groove that matches the shape of the slider. The upper mold frame drives the guide rod up and down, and the guide rod acts on the oblique hole of the slider, causing the slider to slide left and right. When the mold is closed, the slider is located in the groove at the bottom of the upper mold frame, which prevents it from moving and positioning, thereby improving injection quality.

[0010] Furthermore, a runner opening is provided on the top plate, a main runner is provided in the upper mold core, the runner opening is connected to the main runner, and a branch runner is provided in the lower mold core, the branch runner is connected to the main runner, and the other end is connected to the two injection mold cavities. The branch runners connect different injection mold cavities, and multiple products can be injected at one time, thereby improving injection molding efficiency.

[0011] Furthermore, the mold base is provided with support legs on both sides, and the support legs are also directly provided with an ejection device, which includes a bottom plate, a top plate, and a set of ejector pins. The bottom plate is provided with a guide post, the other end of which is connected to the lower mold frame. The top plate is sleeved on the guide post and located on the bottom plate. The ejector pin is provided on the top plate. The guide post is also provided with a spring, which is located between the top plate and the lower mold frame. After the injection molding is completed, the top plate moves up to drive the ejector pins to eject the product and complete the demolding. The spring can also make the top plate automatically and quickly return to its position for the next injection molding.

[0012] Furthermore, the lower mold core and the lower mold frame are provided with an ejector pin hole, the ejector pin hole is communicated with the injection mold cavity, and the ejector pin can pass through the lower mold frame and the lower mold core into the injection mold cavity.

[0013] Each group of ejector pins contains four, one of which is shorter than the other three. The runner connects the shorter ejector pin to the cavity between the shorter ejector pin and the injection mold. During mold closing and injection molding, the longer ejector pin is flush with the bottom of the mold cavity, while the shorter ejector pin leaves space for the injection liquid to enter. Furthermore, the shorter ejector pin is activated first during ejection, preventing the ejector pin from initially contacting the product and potentially damaging it.

[0014] Furthermore, a positioning column is provided on the supporting foot, a positioning hole is provided on the bottom surface of the lower mold frame, the positioning column cooperates with the positioning hole, a guide rod is provided on the lower mold frame, a guide hole is correspondingly provided on the upper mold frame, a shaft sleeve is provided in the guide hole, and the guide rod and the shaft sleeve cooperate to achieve precise mold closing.

[0015] Furthermore, a positioning ring is provided on the top plate, and the positioning ring is located above the main channel. The positioning ring facilitates the alignment of the discharge device with the mold, improves the accuracy of injection molding, reduces the time required for alignment, and improves production efficiency.

[0016] Furthermore, an upper cooling water pipe is installed inside the upper mold core, with its inlet and outlet located on the side of the upper mold frame. A lower cooling water pipe is installed inside the lower mold core, with its inlet and outlet located on the side of the lower mold frame. The cooling pipes accelerate molding speed, effectively shorten holding time, and improve production efficiency.

[0017] Furthermore, both sides of the upper mold frame and the lower mold frame are provided with exhaust holes, which can effectively exhaust the air in the mold core, prevent bubbles from forming in the product, and improve the quality of the product.

[0018] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0019] 1. This utility model provides a reverse-drill button injection mold, in which sliders are disposed on either side of the lower mold core, and plungers are connected to the sliders. During mold closing and injection molding, the plungers are inserted into the lower mold core and into the injection cavity. After injection is complete, the sliders move, and the plungers are withdrawn from the injection cavity. After injection, a through-hole is formed on the side of the product. This simple structure enables the injection molding of buttons with special structures. With its simple structure and rational design, the plungers are disposed on the sliders on both sides. When the upper mold core rises, the plungers are automatically withdrawn. The simultaneous withdrawal of the plungers on both sides offsets the withdrawal process to a certain extent, reducing product deformation and improving product yield. Furthermore, the coordinated withdrawal of the plungers on both sides also shortens travel distance.

[0020] 2. This utility model provides a reverse-drill button injection mold that includes a positioning and ejection device. This device ejects the product after injection, allowing for quick and easy demolding. Automatic reset after demolding enhances the convenience and safety of product collection. The ejection device features three long and one short ejector pins. The injected plastic enters the mold cavity over the short ejector pin. During ejection, the short ejector pin first acts to push the product forward. As the ejector pin continues to rise, the four ejector pins cooperate to eject the product. The short ejector pin targets the area requiring trimming, minimizing damage to the product and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of a reverse drilling button injection mold according to the present invention;

[0022] Figure 2 This is an exploded view of the reverse drill button injection mold described in the utility model;

[0023] Figure 3 This is a structural diagram of the upper mold frame described in the utility model;

[0024] Figure 4 This is a schematic diagram of the assembly of the slider and the lower die core of the utility model;

[0025] Figure 5This is a top view of an inverted drill button injection mold according to the present invention;

[0026] Figure 6 for Figure 5 AA section view;

[0027] Figure 7 for Figure 5 BB section view.

[0028] In the figure: 1-upper mold, 11-top plate, 111-flow channel, 112-positioning ring, 12-upper mold frame, 121-guide rod, 13-upper mold core, 131-mold cavity blocking block, 132-main channel, 133-upper cooling pipe, 2-lower mold, 21-lower mold frame, 211-guide rod, 22-lower mold core, 221-injection mold cavity, 222-runner, 223-lower cooling water pipe, 23-mold foot plate, 231-support foot, 232-positioning column, 24-slider, 241-insert rod, 3-ejection device, 31-bottom plate, 32-top plate, 33-ejector pin, 34-guide column, 35-spring, 4-exhaust hole. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figure 1 and Figure 2 As shown, a reverse drill button injection mold includes an upper mold 1 and a lower mold 2, and the upper mold 1 and the lower mold 2 are matched;

[0031] The upper mold 1 includes a top plate 11, an upper mold frame 12 and an upper mold core 13. The top plate 11 is arranged on the upper part of the upper mold frame 12, and the upper mold core 13 is embedded in the upper mold frame 12.

[0032] like Figure 3 、 4 As shown, the lower mold 2 includes a lower mold frame 21, a lower mold core 22 and a mold foot plate 23. The lower mold core 22 is embedded in the lower mold frame 21, and the lower mold frame 21 is provided on the mold foot plate 23. The lower mold core 22 is provided with at least two injection mold cavities 221. The upper mold core 13 is provided with a mold cavity blocking block 131, and the mold cavity blocking block 131 cooperates with the injection mold cavity 221.

[0033] like Figure 2 、 4 As shown, sliders 24 are provided on both sides of the lower mold core 22. The sliders 24 are slidably provided on the lower mold frame 21. A group of insertion rods 241 are provided on the sliders 24. The insertion rods 241 are inserted into the injection mold cavity 221. The sliders 24 can drive the insertion rods 241 to be pulled out of the injection mold cavity 221.

[0034] The slider 24 is provided with an oblique hole, the upper mold frame 12 is obliquely provided with a guide rod 121 , the guide rod 121 cooperates with the oblique hole, and the bottom of the upper mold frame 12 is also provided with a groove that matches the shape of the slider 24 .

[0035] like Figure 6 、 7 As shown, a flow channel opening 111 is provided on the top plate 11, a main flow channel 132 is provided in the upper mold core 13, the flow channel opening 111 is connected to the main flow channel 132, a branch flow channel 222 is provided in the lower mold core 22, the branch flow channel 222 is connected to the main flow channel 132, and the other end is connected to two injection mold cavities 221 respectively.

[0036] like Figure 2 As shown, support feet 231 are provided on both sides of the mold foot plate 23, and the support feet 231 are directly provided with an ejection device 3. The ejection device 3 includes a bottom plate 31, a top plate 32 and a group of ejector pins 33. A guide column 34 is provided on the bottom plate 31, and the other end of the guide column 34 is connected to the lower mold frame 21. The top plate 32 is sleeved on the guide column 34 and is located on the bottom plate 31. The ejector pin 33 is provided on the top plate 32. A spring 35 is also provided on the guide column 34. The spring 35 is located between the top plate 32 and the lower mold frame 21.

[0037] like Figure 6 As shown, the lower mold core 22 and the lower mold frame 21 are provided with an ejector hole, which is communicated with the injection mold cavity 221 , and the ejector pin 33 can pass through the lower mold frame 21 and the lower mold core 22 to enter the injection mold cavity 221 .

[0038] Preferably, each group of ejector pins 33 has four pins, one of which is shorter than the other three, and the branch channel 222 is connected to the cavity between the shorter ejector pin 33 and the injection mold cavity 221 .

[0039] like Figure 2 As shown, a positioning column 232 is provided on the supporting foot 231, a positioning hole is provided on the bottom surface of the lower mold frame 21, and the positioning column 232 cooperates with the positioning hole. A guide rod 211 is provided on the lower mold frame 21, and a guide hole is correspondingly provided on the upper mold frame 12. A shaft sleeve is provided in the guide hole, and the guide rod 211 cooperates with the shaft sleeve.

[0040] like Figure 1 、 5 A positioning ring 112 is provided on the top plate 11 , and the positioning ring 112 is located above the main channel 132 .

[0041] See again Figure 1The upper mold core 13 is provided with an upper cooling water pipe 133, the water inlet and outlet of which are located on the side of the upper mold frame 12. The lower mold core 22 is provided with a lower cooling water pipe 223, the water inlet and outlet of which are located on one side of the lower mold frame 21. Both sides of the upper mold frame 12 and the lower mold frame 21 are provided with exhaust holes 4.

[0042] The utility model provides a reverse drill button injection mold. When the upper mold 1 moves downward to start the mold closing, the guide hole on the upper mold frame 12 cooperates with the guide column 211 for guidance and positioning. Then the guide column 121 is inserted into the inclined hole in the slider 24 to move the slider 24 toward the lower mold core 22, and the insertion rods 241 on both sides are docked in the injection mold cavity 221 to complete the mold closing. Then, after the feeder is positioned and connected through the positioning ring 112, the material enters the main channel 132 through the runner opening 111, and then enters the two injection mold cavities 221 through the branch channel 222. During injection, air is discharged through the exhaust hole and cooled by the upper cooling pipe 133 and the lower cooling pipe 223. After the injection molding is completed, the mold is removed from the upper mold frame 12, and the guide column 121 moves the slider 24 away from the lower mold core 22 and pulls the insertion rod 241 out of the injection mold cavity 221. The supporting device 3 is started, and the ejector plate 32 drives the ejector pin 33 to eject the product from the mold cavity. At the same time, the spring 35 is compressed. After ejection, the ejector plate automatically returns to its original position under the action of the spring 35, preparing for the next injection molding.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A reverse drill button injection mold, characterized in that: It comprises an upper die (1) and a lower die (2), wherein the upper die (1) and the lower die (2) cooperate with each other; The upper mold (1) comprises a top plate (11), an upper mold frame (12) and an upper mold core (13); the top plate (11) is arranged on the upper part of the upper mold frame (12), and the upper mold core (13) is embedded in the upper mold frame (12); The lower mold (2) comprises a lower mold frame (21), a lower mold core (22) and a mold foot plate (23); the lower mold core (22) is embedded in the lower mold frame (21); the lower mold frame (21) is arranged on the mold foot plate (23); the lower mold core (22) is provided with at least two injection mold cavities (221); the upper mold core (13) is provided with a mold cavity blocking block (131); the mold cavity blocking block (131) cooperates with the injection mold cavity (221); Slide blocks (24) are provided on both sides of the lower mold core (22). The slide blocks (24) are slidably arranged on the lower mold frame (21). A group of insertion rods (241) are provided on the slide blocks (24). The insertion rods (241) are inserted into the injection mold cavity (221). The slide blocks (24) can drive the insertion rods (241) to be drawn out of the injection mold cavity (221).

2. The reverse drill button injection mold according to claim 1, characterized in that: The slider (24) is provided with an oblique hole, the upper mold frame (12) is obliquely provided with a guide rod (121), the guide rod (121) cooperates with the oblique hole, and the bottom of the upper mold frame (12) is also provided with a groove that matches the shape of the slider (24).

3. The reverse drill button injection mold according to claim 1, characterized in that: A flow channel opening (111) is provided on the top plate (11), a main flow channel (132) is provided in the upper mold core (13), the flow channel opening (111) is communicated with the main flow channel (132), a branch flow channel (222) is provided in the lower mold core (22), the branch flow channel (222) is communicated with the main flow channel (132), and the other end is communicated with two injection mold cavities (221) respectively.

4. The reverse drill button injection mold according to claim 3, characterized in that: Support legs (231) are provided on both sides of the mold foot plate (23), and the support legs (231) are also directly provided with an ejection device (3), and the ejection device (3) includes a bottom plate (31), a top plate (32) and a group of ejector pins (33). A guide column (34) is provided on the bottom plate (31), and the other end of the guide column (34) is connected to the lower mold frame (21). The top plate (32) is sleeved on the guide column (34) and is located on the bottom plate (31). The ejector pin (33) is provided on the top plate (32). A spring (35) is also provided on the guide column (34), and the spring (35) is located between the top plate (32) and the lower mold frame (21).

5. The reverse drill button injection mold according to claim 4, characterized in that: The lower mold core (22) and the lower mold frame (21) are provided with an ejector pin hole, the ejector pin hole being in communication with the injection mold cavity (221), and the ejector pin (33) can pass through the lower mold frame (21) and the lower mold core (22) and enter the injection mold cavity (221).

6. The reverse drill button injection mold according to claim 5, characterized in that: The number of ejector pins (33) in each group is four, one of which is shorter than the other three, and the branch channel (222) is connected to the cavity between the shorter ejector pin (33) and the injection mold cavity (221).

7. The reverse drill button injection mold according to claim 6, characterized in that: A positioning column (232) is provided on the support foot (231), a positioning hole is provided on the bottom surface of the lower mold frame (21), the positioning column (232) cooperates with the positioning hole, a guide rod (211) is provided on the lower mold frame (21), a guide hole is correspondingly provided on the upper mold frame (12), a shaft sleeve is provided in the guide hole, and the guide rod (211) cooperates with the shaft sleeve.

8. The reverse drill button injection mold according to claim 3, characterized in that: A positioning ring (112) is provided on the top plate (11), and the positioning ring (112) is located above the main channel (132).

9. The reverse drill button injection mold according to claim 1, characterized in that: An upper cooling water pipe (133) is provided inside the upper mold core (13), and the water inlet and outlet of the upper cooling water pipe (133) are located on the side of the upper mold frame (12). A lower cooling water pipe (223) is provided inside the lower mold core (22), and the water inlet and outlet of the lower cooling water pipe (223) are located on one side of the lower mold frame (21).

10. The reverse drill button injection mold according to claim 1, characterized in that: Both sides of the upper mold frame (12) and the lower mold frame (21) are provided with exhaust holes (4).

Images