Injection mold for processing a harrow head

Abstract

The present invention provides an injection mold for processing a rake head, which belongs to the field of plastic parts injection molding technology. The injection mold for processing the rake head includes an upper plate, an upper mold, a lower mold, a side plate, a bottom plate and a core rod. The lower mold is provided with a slide groove, and a core-pulling slide box that slides along the slide groove is provided in the slide groove. An extension block is fixed to one side of the lower mold, and a core-pulling cylinder is fixed to the extension block. A through hole is provided on the inner side of the core-pulling slide box for the core rod to slide in and out. The core-pulling cylinder is connected to the outer end of the core rod through a connecting rod. A water-cooling channel is provided at one end of the core rod, and an internal water-cooling component for water-cooling the inner wall of the core rod is provided in the water-cooling channel. An external water-cooling component for water-cooling the outer wall of the core rod is provided in the core-pulling slide box. Both the internal water-cooling component and the external water-cooling component are connected to an external circulating water cooling box through a water pipe. During the cooling and shaping process, the internal cooling component cools the core rod from the inside to the outside, and the external cooling component cools the core rod from the outside to the inside, which greatly accelerates the cooling rate of the core rod, reduces the shaping time, and improves production efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of plastic injection molding, and relates to an injection mold for processing a rake head. BACKGROUND

[0002] The injection mold comprises an upper mold and a lower mold, and a mold cavity is formed after the upper mold and the lower mold are closed. After molten plastic raw materials are injected into the mold cavity, the product is cooled and shaped. In order to improve production efficiency and accelerate product cooling and shaping, a water cooling circulation system is generally arranged in the upper mold and the lower mold to accelerate the cooling of the mold and the product, shorten the cooling time, and enable the product to be taken out as soon as possible so as to perform injection molding of the next product. However, some injection molded parts have holes and grooves, and a core is required for molding. When the product is removed, the core needs to be pulled out so as to eject the injection molded part. Since the core does not have a separate or special cooling system, the cooling and shaping of the holes and grooves are slower than those of other parts, and the cooling time cannot be shortened. For example, a beach toy rake is made of plastic material, and it is composed of a rake head and a rake rod. The rake head has a plug-in hole for inserting the rake rod, and then a screw is used for fixation. When the rake head is injection molded, a core rod is required for molding the plug-in hole. However, when the product is removed, the core rod is wrapped by the rake head, and the cooling speed is slower than that of other parts, which causes the above-mentioned problems. SUMMARY

[0003] The present application aims at the above-mentioned problems existing in the prior art, and provides an injection mold for processing a rake head. Through internal and external water cooling components, the core rod is cooled from the outside and the inside, respectively, the waiting time for cooling is reduced, and the production efficiency is improved.

[0004] The present application can be realized by the following technical scheme: an injection mold for processing a rake head comprises an upper plate, an upper mold, a lower mold, side plates, a bottom plate and a core rod. Two side plates are fixed on the bottom plate in parallel, a stripper plate is arranged between the two side plates, a plurality of vertical stripper rods are fixed on the stripper plate, the lower mold is fixed on the side plate, the upper mold is fixed on the upper plate, the upper mold and the lower mold are provided with a mold cavity for forming a rake head, the lower mold is provided with a sliding groove, a core pulling sliding box is arranged in the sliding groove and slides along the sliding groove, the core pulling sliding box is a hollow structure, an extension block is fixed on one side of the lower mold, a core pulling cylinder is fixed on the extension block, a through hole is formed in the inner side of the core pulling sliding box for the sliding of the core rod, the core pulling cylinder is connected with the outer end of the core rod through a connecting rod, a water cooling channel is formed in one end of the core rod, an internal water cooling component for water cooling the inner wall of the core rod is arranged in the water cooling channel, an external water cooling component for water cooling the outer wall of the core rod is arranged in the core pulling sliding box, and the internal water cooling component and the external water cooling component are connected with a circulating water cooling box outside through water pipes.

[0005] Further, the internal water cooling component comprises a U-shaped water cooling pipe which is inserted into the core rod, the outer wall of the U-shaped water cooling pipe is attached to the inner wall of the water cooling channel, and the two ends of the U-shaped water cooling pipe are respectively connected with a water inlet pipe and a water outlet pipe.

[0006] Further, the outer water cooling assembly comprises a water cooling jacket, a mounting plate fixed vertically in the core pulling slide, the water cooling jacket is fixed at the end of the mounting plate, a strip-shaped hole is opened at the lower side of the water cooling jacket, a lower sliding block is connected to the outer side of the core rod, the lower sliding block is located at the middle part of the core rod, the lower sliding block extends out of the strip-shaped hole and is connected with the connecting rod, the water cooling jacket is connected with the second water inlet pipe and the second water outlet pipe respectively at both sides, the core rod is embedded in the water cooling jacket and slides along the water cooling jacket.

[0007] The core pulling cylinder drives the core pulling slide to move, the core rod is pushed to slide out of the core pulling slide at the first time, until the lower sliding block abuts against the inner wall of the core pulling slide when the core rod reaches the maximum stroke, then the core pulling slide continues to move forward with the core rod, until the core pulling slide hits the inner bottom wall of the strip-shaped hole, and finally the mold is closed. After the injection molding is completed, the circulating water pump in the circulating water cooling box is started, the inner cooling assembly and the outer water cooling assembly continuously cool the core rod, and after the cooling and shaping are completed, the mold is opened, then the core pulling cylinder pulls the core rod to translate outward, until the core rod hits the mounting plate in the core pulling slide and no longer moves, at this time the core pulling slide is continuously moved outward together with the core rod by the lower sliding block of the core rod, until the core rod completely exits the rake head.

[0008] Further, the mounting plate is provided with an upper hole and a lower hole, the first water inlet pipe and the first water outlet pipe pass through the upper hole, and the connecting rod passes through the lower hole and is connected with the core pulling cylinder.

[0009] Further, the first water inlet pipe, the first water outlet pipe, the second water inlet pipe and the second water outlet pipe all pass through the core pulling slide.

[0010] The first water inlet pipe, the first water outlet pipe, the second water inlet pipe and the second water outlet pipe are all communicated with the circulating water cooling box outside, the circulating water pump in the circulating water cooling box provides the inner water cooling assembly and the outer water cooling assembly with continuous cooling water through the water pipes, and the cooling water in the inner water cooling assembly and the outer water cooling assembly returns to the circulating water cooling box through the water pipes after taking away the heat of the core rod, so that the rapid cooling of the core rod is completed.

[0011] Further, the water cooling jacket is provided with a separation groove at the upper end, the separation groove is distributed in a 180° central symmetry with the strip-shaped hole and separates the water cooling jacket into left and right halves, the water cooling jacket is provided with an arc-shaped part at the front end for communicating the left and right halves, and the second water inlet pipe and the second water outlet pipe are connected to the left and right halves of the water cooling jacket respectively.

[0012] Further, the lower sliding block is provided with a connecting hole at the lower end, the connecting rod is provided with a threaded hole at one end, and the lower sliding block and the connecting rod are fixed by bolts.

[0013] Further, the core pulling slide is provided with an inclined surface at the outer side, and the upper die is provided with a pressing surface which is fitted with the pressing inclined surface.

[0014] When the mold is closed, the pressing surface is fitted with the inclined surface, so that the inner end of the core pulling slide and the side wall of the sliding groove of the lower die can be firmly abutted together.

[0015] Further, the lower slider just abuts against the inner wall of the core pulling slide box when the core rod extends to the predetermined forming position of the mold cavity.

[0016] The inner wall of the core pulling slide box has a limiting function, so that the core rod can stop moving after accurately entering the predetermined position of the mold cavity.

[0017] Compared with the prior art, the injection mold for processing the harrow head has the following advantages:

[0018] 1. The inner cooling assembly is located in the core rod, and the outer cooling assembly is located in the core pulling slide box, so that the concealment is good, the space is fully utilized, and the occupied space of the mold is reduced.

[0019] 2. During the cooling and shaping process, the inner cooling assembly cools the core rod from the inside to the outside, and the outer cooling assembly cools the core rod from the outside to the inside, so that the cooling rate of the core rod is greatly accelerated, the shaping time is reduced, and the production efficiency is improved.

[0020] 3. Compared with the ordinary core pulling structure, the core rod is fixed at the front end of the core pulling slide box, and the core rod of the present application can slide into the core pulling slide box, so that the stroke of the core pulling slide box is reduced, and the required movement space of the core pulling slide box is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the injection mold for processing the harrow head.

[0022] Figure 2 is a schematic view of the internal structure of the injection mold for processing the harrow head.

[0023] Figure 3 is a schematic view of the structure of the upper mold.

[0024] Figure 4 is a schematic view of the structure of the lower mold.

[0025] Figure 5 is a sectional view of the core pulling slide box.

[0026] Figure 6 is a schematic view of the structure of the outer cooling assembly.

[0027] Figure 7 is a schematic view of the structure of the core rod.

[0028] Figure 8 is an internal assembly view of the core pulling slide box.

[0029] Figure 9 is a schematic view of the structure of the harrow head product.

[0030] In the figure, 1. upper plate; 2. upper die; 3. lower die; 4. side plate; 5. bottom plate; 6. core rod; 7. unloading plate; 8. unloading rod; 9. mold cavity; 10. slide; 11. core-pulling slide box; 12. connecting rod; 13. U-shaped water-cooling pipe; 14. Water inlet pipe 1; 15. Water outlet pipe 1; 16. water-cooling jacket; 17. mounting plate; 18. strip hole; 19. lower slider; 20. Water inlet pipe 2; 21. Water outlet pipe 2; 22. upper hole; 23. lower hole; 24. partition groove; 25. arc portion; 26. connecting hole; 27. inclined surface; 28. extrusion surface; 29. ​​rake head; 30. extension block; 31. core-pulling cylinder. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0032] like Figures 1-4 As shown, the injection mold for processing the rake head includes an upper plate 1, an upper mold 2, a lower mold 3, side plates 4, a bottom plate 5 and a core rod 6. The two side plates 4 are fixed parallel to the bottom plate 5. The lower mold 3 is fixed to the side plates 4, and the upper mold 2 is fixed to the upper plate 1. The upper mold 2 and the lower mold 3 are provided with a mold cavity 9 for forming the rake head 29. The lower mold 3 is provided with a slide 10. The slide 10 is provided with a core-pulling slide box 11 that slides along the slide 10. Figure 9 As shown, a discharge plate 7 is provided between the two side plates 4 , and a plurality of vertically arranged discharge rods 8 are fixed on the discharge plate 7 .

[0033] like Figures 5-8 As shown, the core-pulling slide 11 is a hollow structure, an extension block 30 is fixed on one side of the lower mold 3, and a core-pulling cylinder 31 is fixed on the extension block 30. A through hole is opened on the inner side of the core-pulling slide 11 for the core rod 6 to slide in and out, and the core-pulling cylinder 31 is connected to the outer end of the core rod 6 through the connecting rod 12. A water-cooling channel is opened at one end of the core rod 6, and an internal water-cooling component for water-cooling the inner cavity wall of the core rod 6 is provided in the water-cooling channel. An external water-cooling component for water-cooling the outer wall of the core rod 6 is provided in the core-pulling slide 11, and both the internal water-cooling component and the external water-cooling component are connected to the external circulating water cooling box through a water pipe.

[0034] The inner water cooling assembly includes a U-shaped water cooling tube 13 plugged into the core rod 6, the outer wall of the U-shaped water cooling tube 13 fits the inner wall of the water cooling channel, and the two ends of the U-shaped water cooling tube 13 are respectively connected to a water inlet pipe 14 and a water outlet pipe 15.

[0035] The outer water cooling assembly comprises a water cooling jacket 16, a mounting plate 17 fixed vertically in the core pulling slide box 11, the water cooling jacket 16 is fixed at the end of the mounting plate 17, a strip-shaped hole 18 is opened at the lower side of the water cooling jacket 16, a lower sliding block 19 is connected to the outer side of the core rod 6, the lower sliding block 19 is located at the middle part of the core rod 6, the lower sliding block 19 extends out of the strip-shaped hole 18 and is connected with the connecting rod 12, the water cooling jacket 16 is connected with the water inlet pipe two 20 and the water outlet pipe two 21 respectively at the left and right sides, and the core rod 6 is embedded in the water cooling jacket 16 and slides along the water cooling jacket 16. Since the outer side of the core rod 6 is partially embedded in the water cooling jacket 16, when cooling, the heat of the inner side of the core rod 6 is absorbed through heat transfer, thereby improving the cooling speed.

[0036] The mounting plate 17 is provided with an upper hole 22 and a lower hole 23, the water inlet pipe one 14 and the water outlet pipe one 15 pass through the upper hole 22, and the connecting rod 12 passes through the lower hole 23 and is connected with the core pulling air cylinder 31. The water inlet pipe one 14, the water outlet pipe one 15, the water inlet pipe two 20 and the water outlet pipe two 21 all pass through the core pulling slide box 11. The water inlet pipe one 14, the water outlet pipe one 15, the water inlet pipe two 20 and the water outlet pipe two 21 are all communicated with the circulating water cooling tank outside, the circulating water pump in the circulating water cooling tank provides continuous cooling water to the inner water cooling assembly and the outer water cooling assembly through the water pipes, and the cooling water in the inner water cooling assembly and the outer water cooling assembly is returned to the circulating water cooling tank through the water pipes after taking away the heat of the core rod 6, thereby completing the rapid cooling of the core rod 6.

[0037] Figure 8 The two groups of outer water cooling assemblies and the two groups of inner water cooling assemblies are connected in series respectively, and share one circulating water system.

[0038] The water cooling jacket 16 is provided with a separation groove 24 at the upper end, the separation groove 24 is distributed in a 180° central symmetry with the strip-shaped hole 18 and separates the water cooling jacket 16 into left and right halves, the water cooling jacket 16 is provided with an arc-shaped part 25 at the front end, the arc-shaped part 25 communicates the left and right halves, and the water inlet pipe two 20 and the water outlet pipe two 21 are connected to the left and right halves of the water cooling jacket 16 respectively.

[0039] The lower sliding block 19 is provided with a connecting hole 26 at the lower end, one end of the connecting rod 12 is provided with a threaded hole, and the lower sliding block 19 and the connecting rod 12 are fixed through bolts.

[0040] The core pulling slide box 11 is provided with an inclined surface 27 at the outer side, and the upper die 2 is provided with an extrusion surface 28 which is fitted with the extrusion inclined surface 27. When the mold is closed, the extrusion surface 28 is fitted with the inclined surface 27, which can ensure that the inner end of the core pulling slide box 11 and the side wall of the sliding groove 10 of the lower die 3 are firmly abutted together.

[0041] When the core rod 6 extends into the predetermined molding position of the mold cavity 9, the lower sliding block 19 is just abutted with the inner wall of the core pulling slide box 11. The inner wall of the core pulling slide box 11 has a limiting function, so that the core rod 6 can stop moving after accurately entering the predetermined position of the mold cavity 9.

[0042] Work flow: The upper plate 1 has an injection port, the upper die 2 has a hot runner connecting the injection port and the mold cavity 9, the injection port is connected with a feeding pipe, the injection machine injects molten plastic material into the mold cavity 9 through the feeding pipe. The core pulling cylinder 31 pushes the core pulling slide box 11 to move, the core rod 6 is pushed out of the core pulling slide box 11 at the first time, until the core rod 6 reaches the maximum stroke, that is, the lower slide block 19 abuts against the inner wall of the core pulling slide box 11, then the core pulling slide box 11 is continuously pushed forward by the core rod 6, until the core pulling slide box 11 hits the inner bottom wall of the strip-shaped hole 18, and finally the mold is closed. After the injection is completed, the circulating water pump in the circulating water cooling box is started, the inner cooling assembly and the outer water cooling assembly continuously cool the core rod 6, and after the cooling and shaping are completed, the mold is opened, then the core pulling cylinder 31 pulls the core rod 6 to move outward, until the core rod 6 hits the mounting plate 17 inside the core pulling slide box 11 and no longer moves, at this time the core pulling slide box 11 is continuously moved outward together with the core rod 6 by the lower slide block 19 of the core rod 6, until the core rod 6 completely exits the rake head 29.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. An injection mold for processing a rake head, comprising an upper plate (1), an upper mold (2), a lower mold (3), a side plate (4), a bottom plate (5) and a core rod (6), wherein two side plates (4) are fixed in parallel to the bottom plate (5), a discharge plate (7) is provided between the two side plates (4), a plurality of vertically arranged discharge rods (8) are fixed on the discharge plate (7), the lower mold (3) is fixed to the side plates (4), and the upper mold (2) is fixed to the upper plate (1), characterized in that: The upper mold (2) and the lower mold (3) are provided with a mold cavity (9) for forming a rake head (29), the lower mold (3) is provided with a chute (10), the chute (10) is provided with a core-pulling slide box (11) that slides along the chute (10), the core-pulling slide box (11) is a hollow structure, an extension block (30) is fixed on one side of the lower mold (3), a core-pulling cylinder (31) is fixed on the extension block (30), and a core-pulling slide box (11) is provided on the inner side of the core-pulling slide box (11). The rod (6) slides in and out of the through hole, the core-pulling cylinder (31) is connected to the outer end of the core rod (6) through the connecting rod (12), one end of the core rod (6) is provided with a water-cooling channel, the water-cooling channel is provided with an internal water-cooling component for water-cooling the inner wall of the core rod (6), the core-pulling slide box (11) is provided with an external water-cooling component for water-cooling the outer wall of the core rod (6), the internal water-cooling component and the external water-cooling component are both connected to the external circulating water-cooling box through a water pipe, The inner water cooling assembly includes a U-shaped water cooling tube (13) plugged into the core rod (6), the outer wall of the U-shaped water cooling tube (13) fits the inner wall of the water cooling channel, and the two ends of the U-shaped water cooling tube (13) are respectively connected to a water inlet pipe (14) and a water outlet pipe (15), and the outer water cooling assembly includes a water cooling jacket (16), a mounting plate (17) vertically fixed in the core pulling slide box (11), and the end of the water cooling jacket (16) is fixed on the mounting plate (17). A strip hole (18) is opened on the lower side of the water cooling jacket (16), and a lower slider (19) is connected to the outer side of the core rod (6). The lower slider (19) is located in the middle of the core rod (6). The lower slider (19) extends out of the strip hole (18) and is connected to the connecting rod (12). The two sides of the water cooling jacket (16) are respectively connected to the second water inlet pipe (20) and the second water outlet pipe (21). The core rod (6) is embedded in the water cooling jacket (16) and slides along the water cooling jacket (16).

2. The injection mold for processing a rake head according to claim 1, characterized in that: The mounting plate (17) is provided with an upper hole (22) and a lower hole (23), the water inlet pipe (14) and the water outlet pipe (15) both pass through the upper hole (22), and the connecting rod (12) passes through the lower hole (23) and is connected to the core-pulling cylinder (31).

3. The injection mold for processing a rake head according to claim 2, characterized in that: The water inlet pipe 1 (14), the water outlet pipe 1 (15), the water inlet pipe 2 (20), and the water outlet pipe 2 (21) all pass through the core-pulling slide box (11).

4. The injection mold for processing a rake head according to claim 3, characterized in that: The water cooling jacket (16) has a separation groove (24) at the upper end, and the separation groove (24) and the strip hole (18) are symmetrically distributed at 180 degrees and separate the water cooling jacket (16) into left and right halves. The front end of the water cooling jacket (16) has an arc portion (25) connecting the left and right halves, and the second water inlet pipe (20) and the second water outlet pipe (21) are respectively connected to the left and right halves of the water cooling jacket (16).

5. The injection mold for processing a rake head according to claim 4, characterized in that: A connecting hole (26) is formed at the lower end of the lower slider (19), a threaded hole is formed at one end of the connecting rod (12), and the lower slider (19) and the connecting rod (12) are fixed by bolts.

6. The injection mold for processing a rake head according to claim 1, characterized in that: The outer side of the core-pulling slide box (11) has an inclined surface (27), and the upper die (2) has an extrusion surface (28) that fits the extrusion inclined surface (27).

7. The injection mold for processing a rake head according to claim 5, characterized in that: When the core rod (6) extends into the predetermined molding position of the mold cavity (9), the lower slider (19) just abuts against the inner wall of the core-pulling slide box (11).

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