CN220163139U - Demoulding structure of internal thread - Google Patents

Abstract

The utility model belongs to the technical field of injection molds and discloses an internal thread demoulding structure, which comprises a fixed die assembly and a movable die assembly, wherein the fixed die assembly internally comprises an internal drawing mechanism, the internal drawing mechanism comprises an internal drawing center rod, a plurality of small petals and a plurality of large petals, threads are arranged on the peripheries of the small petals and the large petals, the small petals and the large petals are sequentially enclosed on the periphery of the internal drawing center rod to form a threaded core of an internal thread product, the internal drawing center rod is fixedly connected to the fixed die assembly, the internal drawing center rod is drawn away along with the opening of the fixed die assembly during demoulding, and the inner side space of the small petals and the large petals is loosened so as to realize the separation of the internal thread product from the threaded core. According to the utility model, through the internal drawing structure, the multi-cavity development of the product can be ensured, the full-automatic operation of the whole process of internal cutting is realized, the demolding time is greatly reduced, the production efficiency is effectively improved, and the reject ratio of the product is reduced.

Description

A demoulding structure for internal threads

Technical field

The utility model belongs to the technical field of injection molds, and in particular relates to a demoulding structure for internal threads.

Background technique

The injection molding process refers to the use of plastic molds to make thermoplastic or thermosetting materials into plastic products of various shapes. Injection molding is achieved through an injection molding machine and a mold. In injection mold processing, there are many plastic products with internal threads, and the precision dimensions required are getting higher and higher. At present, the inner core of injection molds for internally threaded parts in China is mostly formed by a threaded rotating core. During demolding, an oil motor is used to drive the threaded rotating core to rotate until the threaded rotating core is completely pulled out before the demoulding can be completed. This method takes a long time to demould, prolongs the product production cycle and reduces production efficiency. If the product has multiple cavities, using an oil motor to rotate will not only increase the size and cost of the mold, but also risk oil leakage from the oil motor, affecting production safety and quality.

Utility model content

The purpose of this utility model is to provide a demoulding structure for internal threads to solve the above technical problems.

In order to achieve the above purpose, the specific technical solution of an internal thread demoulding structure of the present invention is as follows:

An internal thread demoulding structure includes a fixed mold assembly and a movable mold assembly. The fixed mold assembly is fixed on the machine plate of an injection molding machine. The movable mold assembly is driven by the injection molding machine and pressed against the fixed mold assembly. After the injection molding is cooled, the injection molding machine drives the movable mold assembly and the fixed mold assembly to separate to achieve demoulding. The fixed mold assembly includes an inner pumping mechanism, and the inner pumping mechanism includes an inner pumping mechanism. A central rod, a plurality of small lobes and a plurality of large lobes. The small lobes and the large lobes have threads on their outer peripheries. The small and large lobes are sequentially enclosed around the inner periphery of the central rod to form a threaded core of an internally threaded product. The inner drawing center rod is fixedly connected to the fixed mold assembly. When the mold is demoulded, the inner drawing center rod is pulled away when the fixed mold assembly is opened, and the inner space of the small and large valves is loosened to realize the internal thread of the internally threaded product. Detached from the threaded core.

Furthermore, there are three small lobes and three large lobes each, and they are sequentially enclosed around the periphery of the inner central rod in the order of one large lobe and one small lobe.

Further, the fixed mold assembly includes an upper cover plate, a fixed mold frame and an upper cavity. The upper cover plate is fixedly connected to the injection molding machine plate and is in a fixed position. The fixed mold frame 11 is fixedly connected to the injection molding machine. On the upper cover plate, there is an upper mold cavity in the fixed mold frame, and the upper mold cavity forms the shape of the upper half of the product.

Further, the inner-drawing center rod is fixedly connected to the upper composite plate through slot blocks and screws, and the small and large valves are limited and set in the upper mold cavity of the fixed mold frame through limiting blocks. The bit block is fixed on the fixed mold frame through screws.

Further, the upper compound plate and the fixed mold frame are fixedly connected through a limit screw. The limit screw is covered with a spring. When the mold is closed, the spring is compressed; during demoulding, under the elastic force of the spring, the upper compound plate is fixedly connected. The plate and the fixed mold frame are first separated under the action of the spring, and the upper compound plate drives the inner drawing center rod of the inner drawing mechanism to draw away the small and large valves.

Further, the movable mold assembly includes a lower cover plate, mold feet and a movable mold frame. The lower cover plate is fixedly connected to the injection molding machine. The injection molding machine drives the entire movable mold assembly to move. The mold feet are fixed on the lower mold frame. On the composite board, the movable mold frame is fixed on the mold foot, and the movable mold frame has a lower cavity; the lower cavity forms the shape of the lower half of the product.

Further, a product model cavity is formed between the fixed mold frame and the movable mold frame. There is a sprue sleeve in the upper cover plate and the fixed mold frame. The sprue sleeve enters between the upper mold cavity and the lower mold cavity. The flow channel flows into the product model cavity of the upper cavity and lower cavity.

Furthermore, a plurality of plastic retractors are fixed on the movable mold frame, and the fixed mold frame has holes that interfere with the plastic retractors, and the plastic retractors are interference-fitted with the holes.

Further, a cavity is formed between the lower compound plate, the mold foot and the movable mold frame to accommodate the ejector pin assembly. The ejector pin assembly has an ejector plate, an ejector plate, an ejector pin, a reset rod and a reset spring. The ejector pin and the reset rod are The bottom is fixedly connected to the ejector plate, the ejector plate is fixedly connected to the bottom of the ejector plate, the part of the reset rod in the cavity is covered with a reset spring, the reset rod passes through the movable mold frame, and the ejector pin passes through The movable mold frame is connected to the runner between the upper cavity and the lower cavity.

Further, the lower compound plate has a mold ejection hole, and the ejector pin on the injection molding machine pushes the ejector pin out of the mold frame surface through the mold ejection hole, and the return spring is compressed. After the ejector rod is retracted, the reset rod drives the ejector pin to return to the plate under the action of the reset spring, and the ejector pin completes the reset.

The internal thread demoulding structure of this utility model has the following advantages: this utility model can ensure the development of multiple cavities of the product through the internal extraction structure and realize internal cutting of the mold. The entire process is fully automated, which greatly reduces the demoulding time. , effectively improving production efficiency and reducing the defective rate of products.

Description of drawings

Figure 1 is a partial cross-sectional structural schematic diagram of the demoulding structure of the internal thread of the present invention;

Figure 2 is a partial cross-sectional structural schematic diagram of the demoulding structure of the internal thread of the present invention;

Figure 3 is a schematic structural diagram of the internal pumping mechanism of the present utility model;

Figure 4 is a schematic diagram of the limiting and fixing structure of the inner pumping mechanism of the present invention;

Marking instructions in the figure: 10. Upper plate; 11. Fixed mold frame; 111. Hole position; 12. Upper cavity; 13. Gate sleeve; 14. Limiting screw; 15. Spring; 16. Internal pumping mechanism; 161. Internally drawn center rod; 162. Small flap; 163. Large flap; 17. Slot block; 18. Screw; 19. Limiting block; 21. Lower plate; 211. Ejection hole; 22. Mold foot; 23. Moving mold frame; 24. Lower cavity; 25. Plastic retractor; 26. Ejector assembly; 261. Ejector plate; 262. Ejector return plate; 263. Ejector; 264. Reset lever; 265. Reset spring; 3. Inner Threaded products.

Detailed ways

In order to better understand the purpose, structure and function of the present utility model, the demoulding structure of an internal thread of the present utility model will be described in further detail below with reference to the accompanying drawings.

As shown in Figure 1-2, it is a schematic structural diagram of the main parts of an internal thread demoulding structure of the present invention, including a fixed mold component and a movable mold component. The fixed mold component is fixed on the injection molding machine plate, and the movable mold component The mold component is driven by the injection molding machine and pressed together with the fixed mold component to perform injection molding of the product. After the injection molding is cooled, the injection molding machine drives the movable mold component and the fixed mold component to separate and demold.

The fixed mold assembly includes an upper cover plate 10, a fixed mold frame 11 and an upper cavity 12. The upper cover plate 10 is fixedly connected to the injection molding machine plate and has a fixed position. The fixed mold frame 11 is fixedly connected to the upper cover plate 10. There is an upper mold cavity 12 inside the fixed mold frame 11, and the upper mold cavity 12 forms the upper half shape of the internally threaded product 3.

The movable mold assembly includes a lower compound plate 21, mold feet 22, a movable mold frame 23 and a lower cavity 24. The lower compound plate 21 is fixedly connected to the injection molding machine, and the injection molding machine drives the movement of the entire movable mold assembly. The mold feet 22 It is fixed on the lower back plate 21, and the movable mold frame 23 is fixed on the mold foot 22. The movable mold frame 23 has a lower cavity 24; the lower cavity 24 forms the shape of the lower half of the internally threaded product 3.

The injection molding machine pushes the movable mold assembly and the fixed mold assembly to be pressed together to form a product model cavity between the fixed mold frame 11 and the movable mold frame 23. There is a gate sleeve 13 in the upper cover plate 10 and the fixed mold frame 11. The mouthpiece 13 enters the flow channel between the upper cavity and the lower cavity and flows into the product model chambers of the upper cavity and the lower cavity to form an internally threaded product 3. The internally threaded product 3 is cooled and formed in the product model cavity. Perform demoulding and separation.

The upper cover plate 10 and the fixed mold frame 11 are fixedly connected through four limit screws 14. The limit screws 14 are covered with springs 15. When the mold is closed, the springs 15 are compressed.

Four plastic hooks 25 are fixed on the movable mold frame 23. The fixed mold frame 11 has holes 111 that are interference-fitted with the plastic hooks 25. The plastic hooks 25 are interference-connected with the holes 111.

A cavity is formed between the lower return plate 21, the mold foot 22 and the movable mold frame 23 to accommodate the ejector pin assembly 26. The ejector pin assembly 26 has an ejector plate 261, an ejector return plate 262, an ejector pin 263, a return rod 264 and a return spring 265. The ejector pin 263 and The bottom of the reset rod 264 is fixedly connected to the ejector plate 261, the ejector back plate 262 is fixedly connected to the bottom of the ejector plate 261, the part of the reset rod 264 in the cavity is covered with a reset spring 265, the reset rod 264 passes through the movable mold frame 23, and the ejector pin 263 passes through the movable mold frame 23 and is connected to the flow channel between the upper mold cavity and the lower mold cavity. The lower compound plate 21 is provided with a limiting column 266. The limiting column 266 passes through the ejector plate 261 and the ejector plate 262 and is fixedly connected to the movable mold frame 23. The limiting column 266 is used to fix the ejector plate 261 and the ejector plate 262. position so that it does not shift. The lower back plate 21 has a mold ejection hole 211. The ejector pin on the injection molding machine pushes the ejector pin 262 through the mold ejection hole 211 to push the ejector pin 263 out of the surface of the mold frame 23. At this time, the return spring 265 is compressed and the injection molding process is completed. After the ejector pin on the machine is retracted, the reset rod 264 drives the ejector pin 262 to reset under the action of the reset spring 265, and the ejector pin 263 completes the reset.

An internal thread demoulding structure of the present invention includes an inner drawing mechanism 16. The inner drawing mechanism 16 is arranged in the fixed mold assembly. As shown in Figure 3, the inner drawing mechanism 16 includes an inner drawing center rod 161, three small The petal 162 and three large petals 163 have threads on the outer periphery of the small petal 162 and the large petal 163. Three small lobes 162 and three large lobes 163 sequentially surround the outer periphery of the inner drawing center rod 161 in the order of one large valve and one small valve, forming a threaded core of an internally threaded product. As shown in Figure 4, the inner-drawing center rod 161 is fixedly connected to the upper composite plate 10 through the slot block 17 and the screw 18. The three small flaps 162 and the three large flaps 163 are set on the fixed mold through the limiting block 19. In the upper mold cavity of the frame 11, the limiting block 19 is fixed on the fixed mold frame 11 through screws.

After the injection molding is completed, the injection molding machine drives the movable mold assembly to open. The movable mold frame 23 and the fixed mold frame 11 are not separated first under the action of the plastic hook 25. The upper cover plate 10 and the fixed mold frame 11 are separated first under the action of the spring 15. , the upper composite plate 10 drives the inner drawing center rod 161 of the inner drawing mechanism 16 to pull away from the small flap 162 and the large flap 163. The inner space of the small flap 162 and the large flap 163 is loosened, so that the internal thread of the product is separated from the thread core, and then the process continues. The mold is opened, the plastic retractor 25 is separated from the hole 111, the movable mold frame 23 is separated from the fixed mold frame 11, the latent gate is cut off from the internally threaded product 3, and finally the internally threaded product 3 is pushed to the ejector plate 261 through the ejection rod, and finally The ejector pin 263 safely disengages the internally threaded product 3.

It can be understood that the present invention has been described through some embodiments. It is known to those skilled in the art that various changes or equivalents can be made to these features and embodiments without departing from the spirit and scope of the present invention. replace. In addition, in light of the teachings of the invention, modifications may be made to adapt the features and embodiments to a particular situation and material without departing from the spirit and scope of the invention. Therefore, the present utility model is not limited by the specific embodiments disclosed here, and all embodiments falling within the scope of the claims of the present application belong to the scope of protection of the present utility model.

Claims (10)

1. The utility model provides an internal thread demoulding structure, includes cover half subassembly and movable mould subassembly, the cover half subassembly is fixed on the injection molding machine board, movable mould subassembly is driven by the injection molding machine and is pressed together with the cover half subassembly, carries out the injection molding of goods, and the separation of movable mould subassembly and cover half subassembly is realized drawing of patterns by the injection molding machine drive after the injection molding cooling, a serial communication port, including interior take out mechanism (16) in the cover half subassembly, interior take out mechanism (16) including interior take out center pole (161), a plurality of small lamella (162) and a plurality of big lamella (163), small lamella (162) and big lamella (163) periphery have the screw thread, small lamella (162) and big lamella (163) enclose in proper order and are taken out center pole (161) periphery including, form the screw thread core of internal thread goods (3), take out center pole (161) fixed connection in the cover half subassembly, take out center pole (161) and take out with the cover half subassembly open and take out when the drawing of patterns, thereby small lamella (162) and big lamella (163) are inside space loose and are realized internal thread goods (3) and are taken out with the screw thread core.

2. The female screw demoulding structure according to claim 1, wherein the small flaps (162) and the large flaps (163) are each three, and are sequentially enclosed around the periphery of the female central rod (161) in the order of one large flap to one small flap.

3. The internal thread demoulding structure as claimed in claim 1, wherein the fixed mould assembly comprises an upper compound plate (10), a fixed mould frame (11) and an upper cavity (12), the upper compound plate (10) is fixedly connected to a plate of an injection molding machine, the fixed mould frame (11) is fixedly connected to the upper compound plate (10), the fixed mould frame (11) is internally provided with the upper cavity (12), and the upper cavity (12) is internally provided with an upper half part of the internal thread product (3).

4. A demoulding structure with internal threads according to claim 3, characterized in that the internal drawing central rod (161) is fixedly connected to the upper complex plate (10) through a clamping groove block (17) and a screw (18), the small valve (162) and the large valve (163) are arranged in the upper cavity (12) of the fixed mould frame (11) in a limiting way through a limiting block (19), and the limiting block (19) is fixed on the fixed mould frame (11) through a screw.

5. The internal thread demoulding structure according to claim 3, wherein the upper compound plate (10) and the fixed mould frame (11) are fixedly connected through a limit screw (14), a spring (15) is sleeved on the limit screw (14), and the spring (15) is compressed during mould closing; when in demolding, under the action of the elasticity of the spring (15), the upper compound plate (10) and the fixed die frame (11) are separated under the action of the spring (15), and the upper compound plate (10) drives the inner drawing center rod (161) of the inner drawing mechanism (16) to draw away from the small valve (162) and the large valve (163).

6. A demoulding structure with internal threads according to claim 3, characterized in that the movable mould assembly comprises a lower compound plate (21), a mould foot (22) and a movable mould frame (23), wherein the lower compound plate (21) is fixedly connected to an injection moulding machine, the whole movable mould assembly is pushed to move by the injection moulding machine, the mould foot (22) is fixed on the lower compound plate (21), the movable mould frame (23) is fixed on the mould foot (22), and a lower mould cavity (24) is formed in the movable mould frame (23); the lower cavity (24) is internally provided with a lower half part shape of the internal thread product (3).

7. The internal thread demoulding structure as claimed in claim 6, wherein a product model cavity is formed between the fixed mould frame (11) and the movable mould frame (23), a sprue bush (13) is arranged in the upper compound plate (10) and the fixed mould frame (11), and the sprue bush (13) enters a runner between the upper cavity (12) and the lower cavity (24) and flows into the product model cavity of the upper cavity (12) and the lower cavity (24).

8. The internal thread demoulding structure as claimed in claim 6, wherein a plurality of plastic draw hooks (25) are fixed on the movable mould frame (23), the fixed mould frame (11) is provided with hole sites (111) in interference fit with the plastic draw hooks (25), and the plastic draw hooks (25) are in interference connection with the hole sites (111).

9. The internal thread demoulding structure according to claim 7, wherein a cavity for accommodating a thimble assembly (26) is formed among the lower compound plate (21), the die leg (22) and the movable die frame (23), the thimble assembly (26) is used for ejecting a needle plate (261), a thimble compound plate (262), a thimble (263), a reset rod (264) and a reset spring (265), the bottoms of the thimble (263) and the reset rod (264) are fixedly connected to the thimble plate (261), the thimble compound plate (262) is fixedly connected to the bottom of the thimble plate (261), the reset spring (265) is sleeved on the part of the reset rod (264) in the cavity, the reset rod (264) penetrates through the movable die frame (23), and the thimble (263) penetrates through a runner between the movable die frame (23) and the upper die cavity (12) and the lower die cavity (24) to be ejected.

10. The internal thread demoulding structure according to claim 9, wherein the lower compound plate (21) is provided with a mould ejection hole (211), an ejection rod on the injection molding machine ejects the ejector pin (263) out of the surface of the movable mould frame (23) through the mould ejection hole (211) and the ejector pin compound plate (262), the reset spring (265) is compressed, after the ejector rod on the injection molding machine is retracted, the reset rod (264) drives the ejector pin compound plate (262) to reset under the action of the reset spring (265), and the ejector pin (263) is reset.