Injection mold for processing rake head

Abstract

The invention provides an injection mold for machining a rake head, and belongs to the technical field of plastic part injection molding. The injection mold for processing the rake head comprises an upper plate, an upper mold, a lower mold, a side plate, a bottom plate and a core rod, a sliding groove is formed in the lower mold, a core-pulling sliding box sliding along the sliding groove is arranged in the sliding groove, an extension block is fixed to one side of the lower mold, a core-pulling air cylinder is fixed to the extension block, and a through hole allowing the core rod to slide in and out is formed in the inner side of the core-pulling sliding box. The core pulling air cylinder is connected with the outer end of the core rod through a connecting rod, a water cooling hole channel is formed in one end of the core rod, an inner water cooling assembly for conducting water cooling on the inner cavity wall of the core rod is arranged in the water cooling hole channel, an outer water cooling assembly for conducting water cooling on the outer wall of the core rod is arranged in the core pulling sliding box, and the inner water cooling assembly and the outer water cooling assembly are both communicated with an external circulating water cooling box through water pipes. In the cooling and shaping process, the inner cooling assembly cools the core rod from inside to outside, and the outer cooling assembly cools the core rod from outside to inside, so that the cooling rate of the core rod is greatly increased, the shaping time is shortened, and the production efficiency is improved.

Description

Technical Field

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

[0002] An injection mold includes an upper mold and a lower mold. After the upper mold and the lower mold are closed, a mold cavity is formed. After injecting molten plastic raw material into the mold cavity, wait for the product to cool and solidify. In order to improve production efficiency and accelerate the cooling and solidification of the product, a water cooling circulation system is generally provided in the upper mold and the lower mold to accelerate the cooling of the mold and the product, shorten the cooling time, and be able to take out the material as soon as possible to carry out the injection molding of the next product. However, some injection molded parts have holes and grooves and require a core to be formed. When ejecting the material, the core needs to be withdrawn to eject the injection molded part. Since the core does not have a separate or dedicated cooling system, the cooling and solidification of the holes and grooves are slower than other parts, and the cooling time cannot be shortened. For example, a beach toy rake is made of plastic material and consists of a rake head and a rake rod. The rake head has a socket hole for inserting the rake rod, and then is fixed with screws. When injecting the rake head, a core rod is required to form the socket hole. However, when ejecting the material, since the core rod is wrapped by the rake head and the cooling speed is slower than other parts, the above problems will occur. Summary of the Invention

[0003] The purpose of the present invention is to address the above problems in the existing technology and propose an injection mold for processing a rake head. Through an internal water cooling component and an external water cooling component, the core rod is cooled bidirectionally from the outside and the inside respectively, reducing the time of the waiting cooling process and improving production efficiency.

[0004] The purpose of the present invention can be achieved by the following technical solutions: An injection mold for processing a rake head includes an upper plate, an upper mold, a lower mold, side plates, a bottom plate and a core rod. Two side plates are fixedly arranged on the bottom plate in parallel. A stripper plate is arranged between the two side plates. A plurality of vertically arranged stripper rods are fixed on the stripper plate. The lower mold is fixed on the side plates, and the upper mold is fixed on the upper plate. A mold cavity for forming the rake head is formed on the upper mold and the lower mold. A chute is formed on the lower mold, and a core pulling slide box sliding along the chute is arranged in the chute. The core pulling slide box is of a hollow structure. An extension block is fixed on one side of the lower mold, and a core pulling cylinder is fixed on the extension block. A through hole for the core rod to slide in and out is formed on the inner side of the core pulling slide box. The core pulling cylinder is connected with the outer end of the core rod through a connecting rod. One end of the core rod is provided with a water cooling hole passage, and an internal water cooling component for water cooling the inner cavity wall of the core rod is arranged in the water cooling hole passage. An external water cooling component for water cooling the outer wall of the core rod is arranged in the core pulling slide box. Both the internal water cooling component and the external water cooling component are communicated with an external circulating water cooling tank through water pipes.

[0005] Further, the internal water cooling component includes a U-shaped water cooling pipe inserted into the core rod. The outer wall of the U-shaped water cooling pipe fits with the inner wall of the water cooling hole passage. The two ends of the U-shaped water cooling pipe are respectively connected with a first water inlet pipe and a first water outlet pipe.

[0006] Further, the external water cooling component includes a water cooling sleeve and a mounting plate vertically fixed inside the core-pulling slide box. The end of the water cooling sleeve is fixed on the mounting plate. A strip-shaped hole is opened on the lower side of the water cooling sleeve. A downward slider is connected to the outside of the core rod. The downward slider is located in the middle of the core rod. The downward slider extends out of the strip-shaped hole and is connected to the connecting rod. A second water inlet pipe and a second water outlet pipe are respectively connected to both sides of the water cooling sleeve. The core rod is embedded in the water cooling sleeve and slides along the water cooling sleeve.

[0007] The core-pulling cylinder pushes the core-pulling slide box to move. The core rod is immediately pushed out of the core-pulling slide box until the core rod reaches the maximum stroke, that is, the downward slider abuts against the inner wall of the core-pulling slide box. Then the core-pulling slide box is carried forward by the core rod until the core-pulling slide box hits the inner bottom wall of the strip-shaped hole. Finally, the mold is closed. After the injection molding is completed, the circulating water pump in the circulating water cooling box is started. The internal cooling component and the external water cooling component continuously cool the core rod. After the cooling and shaping are completed, the mold is opened. Then the core-pulling cylinder pulls the core rod to move outward until the core rod hits the mounting plate inside the core-pulling slide box and stops moving. At this time, the core-pulling slide box is pushed outward by the downward slider of the core rod and moves together until the core rod completely exits the harrow head.

[0008] Further, an upper hole and a lower hole are opened on the mounting plate. The first water inlet pipe and the first water outlet pipe both pass through the upper hole. The connecting rod passes through the lower hole and is connected to 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 penetrate through the core-pulling slide box.

[0010] The first water inlet pipe, the first water outlet pipe, the second water inlet pipe, and the second water outlet pipe are all connected to the external circulating water cooling box. The circulating water pump in the circulating water cooling box provides continuous cooling water to the internal water cooling component and the external water cooling component through the water pipe. The cooling water in the internal water cooling component and the external water cooling component flows back to the circulating water cooling box through the water pipe after taking away the heat of the core rod, completing the rapid cooling of the core rod.

[0011] Further, a partition groove is opened at the upper end of the water cooling sleeve. The partition groove is symmetrically distributed with the strip-shaped hole at 180° center and divides the water cooling sleeve into left and right halves. The front end of the water cooling sleeve has an arc-shaped part connecting the left and right halves. The second water inlet pipe and the second water outlet pipe are respectively connected to the left and right halves of the water cooling sleeve.

[0012] Further, a connection hole is opened at the lower end of the downward slider. A threaded hole is opened at one end of the connecting rod. The downward slider and the connecting rod are fixed by bolts.

[0013] Further, the outside of the core-pulling slide box has an inclined surface, and the upper mold has an extrusion surface that fits with the extrusion inclined surface.

[0014] When the mold is closed, the extrusion surface fits with the inclined surface, which can ensure that the inner end of the core-pulling slide box firmly abuts against the side wall of the chute of the lower mold.

[0015] Furthermore, when the core rod extends into the predetermined forming position of the mold cavity, the lower sliding block just abuts against the inner wall of the core-pulling slide box.

[0016] Due to the limiting function of the inner wall of the core-pulling slide box, the core rod can accurately enter the predetermined position of the mold cavity and then stop moving.

[0017] Compared with the prior art, the injection mold for processing the rake head has the following advantages: 1. The internal cooling component is located inside the core rod, and the external cooling component is located inside the core-pulling slide box, with good concealment, making full use of space and reducing the occupied space of the mold.

[0018] 2. During the cooling and shaping process, the internal cooling component cools the core rod from the inside out, and the external cooling component cools the core rod from the outside in, greatly accelerating the cooling rate of the core rod, reducing the shaping time, and improving production efficiency.

[0019] 3. Compared with the ordinary core-pulling structure where the core rod is fixed at the front end of the core-pulling slide box, the core rod of the present invention can also slide into the core-pulling slide box, reducing the stroke of the core-pulling slide box, and thus reducing the required moving space of the core-pulling slide box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the injection mold for processing the rake head.

[0021] Figure 2 is a schematic internal structure diagram of the injection mold for processing the rake head.

[0022] Figure 3 is a schematic structure diagram of the upper mold.

[0023] Figure 4 is a schematic structure diagram of the lower mold.

[0024] Figure 5 is a cross-sectional view of the core-pulling slide box.

[0025] Figure 6 is a schematic structure diagram of the external cooling component.

[0026] Figure 7 is a schematic structure diagram of the core rod.

[0027] Figure 8 is an internal assembly diagram of the core-pulling slide box.

[0028] Figure 9 is a schematic structure diagram of the rake head product.

[0029] In the figure, 1 is the upper plate; 2 is the upper mold; 3 is the lower mold; 4 is the side plate; 5 is the bottom plate; 6 is the core rod; 7 is the stripper plate; 8 is the stripper rod; 9 is the mold cavity; 10 is the chute; 11 is the core-pulling slide box; 12 is the connecting rod; 13 is the U-shaped water-cooling pipe; 14 is the first water inlet pipe; 15 is the first water outlet pipe; 16 is the water-cooling sleeve; 17 is the mounting plate; 18 is the strip hole; 19 is the lower slider; 20 is the second water inlet pipe; 21 is the second water outlet pipe; 22 is the upper hole; 23 is the lower hole; 24 is the partition groove; 25 is the arc portion; 26 is the connection hole; 27 is the inclined surface; 28 is the extrusion surface; 29 is the rake head; 30 is the extension block; 31 is the core-pulling cylinder. Detailed implementation manners

[0030] The following are specific embodiments of the present invention and, in combination with the accompanying drawings, further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0031] As Figures 1-4 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. Two side plates 4 are fixedly arranged in parallel on the bottom plate 5. The lower mold 3 is fixed on the side plates 4, the upper mold 2 is fixed on the upper plate 1, a mold cavity 9 for forming the rake head 29 is formed on the upper mold 2 and the lower mold 3, a chute 10 is formed on the lower mold 3, and a core-pulling slide box 11 that slides along the chute 10 is arranged in the chute 10. As Figure 9 shown, a stripper plate 7 is arranged between the two side plates 4, and a plurality of vertically arranged stripper rods 8 are fixed on the stripper plate 7.

[0032] As Figures 5-8 shown, 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, a through hole for the core rod 6 to slide in and out is formed inside the core-pulling slide box 11, the core-pulling cylinder 31 is connected to the outer end of the core rod 6 through a connecting rod 12, a water-cooling hole channel is formed at one end of the core rod 6, an internal water-cooling component for water-cooling the inner cavity wall of the core rod 6 is arranged in the water-cooling hole channel, an external water-cooling component for water-cooling the outer wall of the core rod 6 is arranged in the core-pulling slide box 11, and both the internal water-cooling component and the external water-cooling component are communicated with an external circulating water-cooling tank through water pipes.

[0033] The internal water-cooling component includes a U-shaped water-cooling pipe 13 inserted into the core rod 6. The outer wall of the U-shaped water-cooling pipe 13 is attached to the inner wall of the water-cooling hole channel, and the two ends of the U-shaped water-cooling pipe 13 are respectively connected with a first water inlet pipe 14 and a first water outlet pipe 15.

[0034] The external water cooling assembly includes a water cooling sleeve 16 and a mounting plate 17 vertically fixed inside the core-pulling slide box 11. The end of the water cooling sleeve 16 is fixed on the mounting plate 17. A strip-shaped hole 18 is opened on the lower side of the water cooling sleeve 16. 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-shaped hole 18 and is connected to the connecting rod 12. Water inlet pipe two 20 and water outlet pipe two 21 are respectively connected to both sides of the water cooling sleeve 16. The core rod 6 is embedded in the water cooling sleeve 16 and slides along the water cooling sleeve 16. Since a part of the outer side of the core rod 6 is embedded in the water cooling sleeve 16, during cooling, through heat transfer, the heat of the inner part of the core rod 6 is absorbed, improving the cooling speed.

[0035] Upper holes 22 and lower holes 23 are opened on the mounting plate 17. The water inlet pipe one 14 and the water outlet pipe one 15 both pass through the upper holes 22. The connecting rod 12 passes through the lower holes 23 and is connected to the core-pulling 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 penetrate 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 connected to an external circulating water cooling tank. The circulating water pump in the circulating water cooling tank provides continuous cooling water to the internal water cooling assembly and the external water cooling assembly through water pipes. The cooling water in the internal water cooling assembly and the external water cooling assembly flows back to the circulating water cooling tank through water pipes after taking away the heat of the core rod 6, completing the rapid cooling of the core rod 6.

[0036] Figure 8 There are two groups of external water cooling assemblies and two groups of internal water cooling assemblies connected in series with each other and sharing a circulating water system.

[0037] A partition groove 24 is opened at the upper end of the water cooling sleeve 16. The partition groove 24 is symmetrically distributed with the strip-shaped hole 18 at 180° and divides the water cooling sleeve 16 into left and right halves. The front end of the water cooling sleeve 16 has an arc-shaped part 25 connecting the left and right halves. The water inlet pipe two 20 and the water outlet pipe two 21 are respectively connected to the left and right halves of the water cooling sleeve 16.

[0038] A connection hole 26 is opened at the lower end of the lower slider 19. A threaded hole is opened at one end of the connecting rod 12. The lower slider 19 and the connecting rod 12 are fixed by bolts.

[0039] 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 with the extrusion inclined surface 27. When the die is closed, the extrusion surface 28 fits with the inclined surface 27, which can ensure that the inner end of the core-pulling slide box 11 firmly abuts against the side wall of the chute 10 of the lower die 3.

[0040] When the core rod 6 extends to the predetermined forming position in the mold cavity 9, the lower slider 19 just abuts against the inner wall of the core-pulling slide box 11. Through the limiting function of the inner wall of the core-pulling slide box 11, the core rod 6 can accurately enter the predetermined position in the mold cavity 9 and then stop moving.

[0041] Workflow: The upper plate 1 has an injection molding connection port. A hot runner communicating the mold cavity 9 with the injection molding connection port is provided inside the upper mold 2. The injection molding connection port is connected to a feed pipe. The injection molding machine injects molten plastic raw materials into the mold cavity 9 through the feed pipe. The core pulling cylinder 31 pushes the core pulling slide box 11 to move. The core rod 6 is immediately pushed out of the core pulling slide box 11 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 carried forward by the core rod 6 until the core pulling slide box 11 hits the inner bottom wall of the strip hole 18, and finally the mold is closed. After the injection molding is completed, the circulating water pump in the circulating water cooling box starts, and the internal cooling component and the external water cooling component continuously cool the core rod 6. After the cooling and shaping are completed, the mold is opened. Then the core pulling cylinder 31 pulls the core rod 6 to translate outwards until the core rod 6 hits the mounting plate 17 inside the core pulling slide box 11 and stops moving. At this time, the core pulling slide box 11 is pushed outwards by the lower slide block 19 of the core rod 6 and moves together until the core rod 6 completely exits the harrow head 29.

[0042] The specific embodiments described in this document are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention 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), side plates (4), a bottom plate (5) and a core rod (6). Two side plates (4) are fixedly arranged on the bottom plate (5) in parallel. A stripping plate (7) is arranged between the two side plates (4). A plurality of vertically arranged stripping rods (8) are fixed on the stripping plate (7). The lower mold (3) is fixed on the side plates (4), and the upper mold (2) is fixed on the upper plate (1), characterized in that, The upper die (2) and the lower die (3) are provided with a die cavity (9) for forming a harrow head (29). The lower die (3) is provided with a chute (10), and a core-pulling slide box (11) sliding along the chute (10) is arranged in the chute (10). The core-pulling slide box (11) is of a hollow structure. An extension block (30) is fixed on one side of the lower die (3), and a core-pulling cylinder (31) is fixed on the extension block (30). A through hole for the core rod (6) to slide in and out is formed in the inner side of the core-pulling slide box (11). The core-pulling cylinder (31) is connected to the outer end of the core rod (6) through a connecting rod (12). One end of the core rod (6) is provided with a water-cooling hole passage, and an internal water-cooling component for water-cooling the inner cavity wall of the core rod (6) is arranged in the water-cooling hole passage. An external water-cooling component for water-cooling the outer wall of the core rod (6) is arranged in the core-pulling slide box (11). Both the internal water-cooling component and the external water-cooling component are communicated with an external circulating water-cooling box through water pipes.

2. The injection mold for processing a rake head according to claim 1, characterized in that, The internal water-cooling component includes a U-shaped water-cooling pipe (13) inserted into the core rod (6). The outer wall of the U-shaped water-cooling pipe (13) is attached to the inner wall of the water-cooling hole passage. The two ends of the U-shaped water-cooling pipe (13) are respectively connected with a first water inlet pipe (14) and a first water outlet pipe (15).

3. The injection mold for processing a rake head according to claim 1, characterized in that, The external water-cooling component includes a water-cooling sleeve (16) and a mounting plate (17) vertically fixed in the core-pulling slide box (11). The end of the water-cooling sleeve (16) is fixed on the mounting plate (17). A strip-shaped hole (18) is formed in the lower side of the water-cooling sleeve (16). A lower sliding block (19) is connected to the outer side of the core rod (6). The lower sliding block (19) is located in the middle 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 two sides of the water-cooling sleeve (16) are respectively connected with a second water inlet pipe (20) and a second water outlet pipe (21). The core rod (6) is embedded in the water-cooling sleeve (16) and slides along the water-cooling sleeve (16).

4. An injection mold for processing a rake head according to claim 3, characterized in that, Upper holes (22) and lower holes (23) are formed in the mounting plate (17). Both the first water inlet pipe (14) and the first water outlet pipe (15) pass through the upper holes (22). The connecting rod (12) passes through the lower holes (23) and is connected with the core-pulling cylinder (31).

5. An injection mold for processing a rake head according to claim 4, characterized in that, The first water inlet pipe (14), the first water outlet pipe (15), the second water inlet pipe (20), and the second water outlet pipe (21) all penetrate through the core-pulling slide box (11).

6. The injection mold for processing a rake head according to claim 5, characterized in that, A partition groove (24) is formed at the upper end of the water-cooling sleeve (16). The partition groove (24) is symmetrically distributed with the strip-shaped hole (18) at 180° and divides the water-cooling sleeve (16) into left and right halves. The front end of the water-cooling sleeve (16) has an arc-shaped part (25) connecting the left and right halves. 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 sleeve (16).

7. An injection mold for processing a rake head according to claim 6, characterized in that, A connecting hole (26) is formed at the lower end of the lower sliding block (19). A threaded hole is formed at one end of the connecting rod (12). The lower sliding block (19) and the connecting rod (12) are fixed by bolts.

8. 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) fitting with the extrusion inclined surface (27).

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

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