Side core-pulling blow mold and production process thereof

Abstract

The invention relates to a side core-pulling blow molding mold and a production process thereof, and relates to the technical field of blow molding equipment, the blow molding mold comprises a fixing plate, an upper mold and a lower mold, a cylinder body is fixed to the side, facing the upper mold, of the fixing plate, a piston is arranged in the cylinder body in a sliding mode, the piston is fixed to the upper mold, the cylinder body communicates with an air pipe, an air cavity is formed in the lower mold, and the air cavity is communicated with the air pipe. A sliding part is arranged in the air cavity in a sliding mode, sealing rings are arranged on the side walls of the two ends of the sliding part, the air pipe is communicated with the position, below the sliding part, in the air cavity, the sliding part comprises an inclined rod arranged in an inclined mode, the inclined rod is sleeved with a sliding ring, a pull rod is fixed to the sliding ring, and a side mold core is fixed to the end of the pull rod. And the side mold core is connected with the lower mold in a sliding manner. The side core-pulling action can be automatically completed through movement of the upper mold, the side core-pulling mechanism cannot protrude out of the side wall of the mold, occupied space is reduced, and workers can conveniently operate plastic products; and air blowing can be automatically carried out to assist demolding, and electric control is not needed.

Description

Technical Field

[0001] The present application relates to the technical field of blow molding equipment, and in particular to a side core-pulling blow molding mold and a production process thereof. Background Art

[0002] Blow molding equipment is mostly used to produce thin-walled plastic products such as plastic bottles and plastic boxes. During blow molding, the semi-fluid plastic is blown up and squeezed onto the inner wall of the mold cavity by blowing in gas, and then the desired shape of the plastic product is formed after cooling.

[0003] The existing utility model patent with announcement number CN205202132U discloses a compressed air molding mold that can ensure the smoothness of the inner wall of the molded product, including a concave mold, which is installed on a mold base, and a groove-shaped mold cavity is opened on the upper part of the concave mold, and a vertical lower air hole is also opened on the concave mold. It also includes a convex heating plate located directly above the mold cavity of the concave mold, and a vertical upper air hole is opened on the convex heating plate. The lower part of the convex heating plate is a boss integrated with it, and the outer dimensions of the boss are consistent with the dimensions of the inner wall of the mold cavity of the concave mold. The lower part of the convex heating plate is located at the outer periphery of the boss and is detachably connected to a mounting block. The lower end face of the mounting block is flush with the lower end face of the boss, and the inner side surface of the mounting block is in contact with the outer side surface of the boss.

[0004] A side core pulling mechanism may be provided on the mold to form a concave shape of the outer wall of the plastic product. For example, the invention patent application with the publication number CN102476443A discloses a lampshade blow molding mold device, including first and second half molds, and also including an upper slider and a lower slider, the upper slider and the lower slider are respectively slidably arranged on the first side surface of one of the first and second half molds, the upper slider and the lower slider are relative to each other up and down to define the slider center hole when resetting, the upper core pulling and the lower core pulling are arranged on one half mold for moving the upper slider and the lower slider up and down respectively, and the upper core pulling and the lower core pulling are respectively hydraulic core pulling.

[0005] With respect to the above-mentioned related technologies, the inventor believes that the existing core pulling mechanism protrudes from the outer wall of the mold. If there are core pulling mechanisms around the product, the space occupied around the mold will be greatly increased, making it difficult to place the mold and occupying the aisle space. In addition, during the process of assisting demolding and taking materials, personnel will not have enough operating space and may easily collide with the core pulling mechanism and get injured. Summary of the invention

[0006] The present application provides a side core-pulling blow molding mold and a production process thereof, which avoids the core-pulling mechanism occupying the outer space of the mold, reduces the installation space, and facilitates personnel to operate the plastic product.

[0007] The present application provides a side core-pulling blow molding mold, which adopts the following technical solution: A side core-pulling blow molding mold comprises a fixed plate, an upper mold and a lower mold, a guide rod is fixed between the lower mold and the fixed plate, the upper mold is slidably connected to the guide rod, a cavity is provided on the side of the upper mold and the lower mold facing each other, a cylinder body is fixed on the side of the fixed plate facing the upper mold, a piston is slidably arranged in the cylinder body, the piston is fixed to the upper mold, an air pipe is connected to the cylinder body, an air cavity is provided in the lower mold, a sliding part is slidably arranged in the air cavity, sealing rings are provided on both end side walls of the sliding part, the air pipe is connected to the bottom of the sliding part in the air cavity, the sliding part comprises an inclined rod arranged obliquely, a slip ring is provided on the outer sleeve of the inclined rod, a pull rod is fixed to the slip ring, a side core is fixed to the end of the pull rod, and the side core is slidably connected to the lower mold.

[0008] By adopting the above technical solution, when the mold is opened, the upper mold moves upward. During this process, the piston is inserted into the cylinder and squeezes the air in the cylinder. The gas enters the lower end of the air cavity through the air pipe, driving the sliding part to move upward. During the upward movement of the sliding part, the slip ring slides outside the inclined rod, and the inclined rod pulls the side core away from the cavity to complete the side core pulling. The side core pulling mechanism of the present application will not protrude from the side wall of the mold, reducing the space occupied and facilitating the operation of the plastic product by personnel.

[0009] Optionally, the sliding member includes cylindrical blocks located at upper and lower ends, the sealing ring is sleeved outside the cylindrical block, and the cylindrical block is slidably sealed with the inner wall of the air cavity through the sealing ring.

[0010] By adopting the above technical solution, air leakage can be avoided through the sealing ring.

[0011] Optionally, the sliding member further comprises a vertical rod arranged vertically, and the lower end of the vertical rod is fixed to the upper end of the oblique rod.

[0012] By adopting the above technical solution, after the mold is closed, the slip ring is located in a position of sliding contact with the vertical rod, and the side core is inserted into the cavity; since the sliding directions of the vertical rod and the side core are perpendicular, the side core will not move even if it is squeezed, thereby improving the stability of the side core during the process of molding the product structure.

[0013] Optionally, the air cavity penetrates upward to the top surface of the lower mold, the upper end of the air cavity is threadedly connected to a locking cover, and a vent hole is provided in the center of the locking cover.

[0014] By adopting the above technical solution, the sliding part and the spring in the air cavity can be easily disassembled and assembled by opening the lock cover, and the space above the sliding part in the air cavity can be prevented from being blocked by air through the vent hole.

[0015] Optionally, a spring is provided between the locking cover and the upper end of the sliding member.

[0016] By adopting the above technical solution, a restoring force for the sliding member to move downward is applied by the spring.

[0017] Optionally, the lower mold is provided with a sliding hole for the side core to slide, and a bypass hole connecting the sliding hole wall and the air cavity is provided in the lower mold. After the sliding part slides upward, the sealing ring below moves to above the end of the sliding hole.

[0018] By adopting the above technical solution, after the sliding part slides upward, the sealing ring below moves to above the end of the sliding hole, so that the bypass hole connects the lower space of the air cavity with the space inside the cavity, thereby releasing the gas in the lower space of the air cavity into the cavity through the sliding hole for air blowing and demoulding.

[0019] Optionally, the piston is annular, and a valve plate is movably provided on the top surface of the piston, and the valve plate is connected to the piston through a rubber portion on one side.

[0020] By adopting the above technical solution, the valve plate forms a one-way valve structure at the piston. When the piston moves downward, the outside air can pass through the center hole of the piston and enter the cylinder; when the piston moves upward, the valve plate closes the center hole of the piston, and the piston compresses the air in the cylinder.

[0021] Optionally, the guide rod is hollow inside and connected at both ends, and the air pipe passes through the guide rod.

[0022] By adopting the above technical solution, the air pipe passes through the guide rod, which avoids the air pipe being difficult to arrange outside the mold and also avoids the air pipe interfering with personnel activities.

[0023] In the second aspect, the present application provides a production process for side core-pulling blow molding, which adopts the following technical solution: A production process for side core-pulling blow molding, using the above-mentioned side core-pulling blow molding mold, comprises the following steps: Step S1: The upper mold is driven to move by the oil cylinder, and after the mold is closed, the side core is inserted into the mold cavity, and the blow molding head blows air for blow molding; Step S2: After the plastic solidifies, the mold is opened and the upper mold moves upward. During this process, the piston is inserted into the cylinder and squeezes the air in the cylinder. The gas enters the lower end of the air cavity through the air pipe, driving the sliding part to move upward; Step S3: During the upward movement of the sliding member, the inclined rod pulls the side core away from the cavity, completing the side core pulling.

[0024] By adopting the above technical solution and the above production process, the side core pulling action can be automatically completed by moving the upper mold without the need for electric control, and the side core pulling mechanism will not protrude from the side wall of the mold, thereby reducing space occupation and making it easier for personnel to operate plastic products.

[0025] Optionally, in step S3, after the side core pulling is completed, as the sliding part continues to move upward, the sealing ring moves to above the port of the bypass hole, and the air in the lower part of the air cavity enters the cavity through the bypass hole and the sliding hole to perform air blowing and demolding.

[0026] By adopting the above technical solution, after completing the side core pulling, air blowing-assisted demoulding can be automatically performed without the need for electronic control.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The side core pulling action can be automatically completed by moving the upper mold, and the side core pulling mechanism will not protrude from the side wall of the mold, reducing the space occupied and making it easier for personnel to operate plastic products; 2. It can automatically perform air blowing to assist demoulding without the need for electronic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional view of a side core-pulling blow molding mold of an embodiment; Figure 2 is a partial stereogram of an embodiment; Figure 3 yes Figure 1 A magnified image of point A; Figure 4 It is a partial cross-sectional view of the mold in the closed state.

[0029] Explanation of the accompanying drawings: 1. fixed plate; 2. upper mold; 3. lower mold; 11. guide rod; 31. cavity; 12. cylinder body; 13. piston; 14. valve plate; 15. air pipe; 32. air cavity; 4. sliding part; 41. cylindrical block; 42. vertical rod; 43. inclined rod; 44. sealing ring; 51. sliding ring; 52. pull rod; 5. side core; 33. sliding hole; 6. locking cover; 61. spring; 62. vent hole; 34. bypass hole. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings.

[0031] Embodiment 1:

[0032] Reference Figure 1 The present embodiment discloses a side core-pulling blow molding mold, comprising a fixed plate 1, an upper mold 2 and a lower mold 3. The fixed plate 1 is located above the upper mold 2. A guide rod 11 is fixed between the lower mold 3 and the fixed plate 1. The upper mold 2 is slidably connected to the guide rod 11. The upper mold 2 is driven to move by a cylinder (not shown in the figure) on the fixed plate 1. A cavity 31 is provided on the side opposite to the upper mold 2 and the lower mold 3. A blow molding port for compressed air to enter is provided in the center of the upper mold 2.

[0033] Reference Figure 1 and Figure 2, a cylinder 12 is fixed on the side of the fixed plate 1 facing the upper mold 2, the opening of the cylinder 12 is vertically downward, a piston 13 is slidably arranged in the cylinder 12, and the bottom surface of the piston 13 is fixed to the upper mold 2 through a hollow frame. When the upper mold 2 moves upward away from the lower mold 3 (i.e., the mold is opened), the piston 13 slides deep into the cylinder 12, thereby compressing the air in the cylinder 12. The piston 13 is annular and has a middle hole. A valve plate 14 is movably arranged on the top surface of the piston 13, and the valve plate 14 is connected to the piston 13 through a rubber part on one side. The valve plate 14 forms a one-way valve structure at the piston 13. When the piston 13 moves downward, the outside air can enter the cylinder 12 through the middle hole of the piston 13; when the piston 13 moves upward, the valve plate 14 closes the middle hole of the piston 13, and the piston 13 compresses the air in the cylinder 12.

[0034] The cylinder 12 is connected with an air pipe 15. The guide rod 11 is hollow inside and connected at both ends. The air pipe 15 penetrates the guide rod 11 and enters the lower mold 3. The guide rod 11 is generally a hollow structure to save materials and reduce weight. The air pipe 15 utilizes this structure to avoid the air pipe 15 being difficult to arrange outside the mold and to avoid the air pipe 15 interfering with personnel activities.

[0035] Reference Figures 1 to 3 The lower mold 3 is provided with an air cavity 32, which is located on one side of the cavity 31. A sliding member 4 is slidably arranged in the air cavity 32, and the sliding direction of the sliding member 4 is along the vertical direction. The sliding member 4 includes cylindrical blocks 41 located at the upper and lower ends, and also includes a vertically arranged vertical rod 42 and an obliquely arranged oblique rod 43, wherein the upper end of the vertical rod 42 is fixed to the upper cylindrical block 41, the lower end of the vertical rod 42 is fixed to the upper end of the oblique rod 43, the lower end of the oblique rod 43 is fixed to the lower cylindrical block 41, and the lower end of the oblique rod 43 is obliquely extended in a direction away from the cavity 31. The side walls of the sliding member 4 are provided with sealing rings 44 at both ends, and the sealing rings 44 are specifically sleeved outside the cylindrical block 41. The cylindrical block 41 is slidably sealed with the inner wall of the air cavity 32 through the sealing rings 44. The air pipe 15 is connected to the lower part of the sliding member 4 in the air cavity 32. When the air pipe 15 inputs air into the air cavity 32, the air drives the sliding member 4 to move upward.

[0036] The outer sleeve of the inclined rod 43 is provided with a slip ring 51, a pull rod 52 is fixed to the slip ring 51, a side core 5 is fixed to the end of the pull rod 52, the side core 5 is slidably connected to the lower mold 3, the lower mold 3 is provided with a sliding hole 33 for the side core 5 to slide, the sliding hole 33 is connected to the cavity 31, and the groove or handle structure of the side wall of the plastic product is formed through the side core 5. The inner diameter of the slip ring 51 is larger than the diameter of the inclined rod 43, and when the sliding member 4 slides up and down, the slip ring 51 can also slide to the outside of the vertical rod 42 and make sliding contact with the vertical rod 42.

[0037] The air cavity 32 is connected upward to the top surface of the lower mold 3. The upper end of the air cavity 32 is threadedly connected with a lock cover 6. A spring 61 is provided between the lock cover 6 and the upper end of the sliding member 4. A hexagonal hole is provided on the top surface of the lock cover 6, which is convenient for rotating the lock cover 6 by a tool. After tightening the lock cover 6, the top surface of the lock cover 6 does not protrude from the top surface of the lower mold 3. A vent hole 62 is provided in the center of the lock cover 6. By opening the lock cover 6, the sliding member 4 and the spring 61 in the air cavity 32 can be easily disassembled and assembled. The vent hole 62 can prevent the space above the sliding member 4 in the air cavity 32 from being suffocated, and the spring 61 can apply a restoring force to the sliding member 4 to move downward.

[0038] A bypass hole 34 connecting the wall of the sliding hole 33 and the air cavity 32 is provided in the lower mold 3. After the sliding member 4 slides upward, the sealing ring 44 at the bottom moves to above the end of the sliding hole 33, so that the bypass hole 34 connects the lower space of the air cavity 32 with the space in the cavity 31, thereby releasing the gas in the lower space of the air cavity 32 into the cavity 31 through the sliding hole 33 for air blowing and demolding.

[0039] It should be noted that only one set of side core pulling mechanism is shown in this embodiment. In actual implementation, multiple sets of this mechanism can be arranged in the circumference of the mold as needed, and all side core pulling mechanisms do not protrude from the side wall of the mold. This side core pulling blow molding mold avoids the core pulling mechanism occupying the outer space of the mold, reduces the installation space, and is convenient for personnel to operate the plastic product.

[0040] Embodiment 2:

[0041] A production process for side core-pulling blow molding, using a side core-pulling blow molding mold of embodiment 1, comprises the following steps: Step S1: Refer to Figure 4 , the upper mold 2 is driven by the oil cylinder to move downward. After the mold is closed, the sliding ring 51 is located at a position of sliding contact with the vertical rod 42, the side core 5 is inserted into the cavity 31, and the blow head blows air to perform blow molding; since the vertical rod 42 is perpendicular to the sliding direction of the side core 5, the side core 5 will not move even if it is squeezed. Under the elastic force of the spring 61, the sliding member 4 is at the lowest point, and the sealing ring 44 below is located below the bypass hole 34, and the sealing ring 44 separates the bypass hole 34 from the bottom space in the air cavity 32.

[0042] Step S2: After the plastic solidifies, the mold is opened and the upper mold 2 moves upward. During this process, the piston 13 is inserted into the cylinder 12 and squeezes the air in the cylinder 12. The gas enters the lower end of the air cavity 32 through the air pipe 15, driving the sliding member 4 to move upward, and the spring 61 is gradually compressed.

[0043] Step S3: Refer to Figure 1 and Figure 3During the upward movement of the slide member 4, the slide ring 51 slides to the position of the inclined rod 43, and the inclined rod 43 pulls the side core 5 away from the cavity 31 to complete the side core pulling. After the side core pulling is completed, as the slide member 4 continues to move upward, the sealing ring 44 moves to the top of the port of the bypass hole 34, and the air in the lower part of the air cavity 32 enters the cavity 31 through the bypass hole 34 and the slide hole 33 to perform air blowing and demoulding.

[0044] Through the above production process, the side core pulling action can be automatically completed by moving the upper mold 2, and air blowing can be automatically performed to assist demolding without the need for electrical control. The side core pulling mechanism will not protrude from the side wall of the mold, thereby reducing space occupancy and making it easier for personnel to operate plastic products.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A side core-pulling blow molding mold, comprising a fixed plate (1), an upper mold (2) and a lower mold (3), a guide rod (11) being fixed between the lower mold (3) and the fixed plate (1), the upper mold (2) being slidably connected to the guide rod (11), a cavity (31) being provided on the side of the upper mold (2) and the lower mold (3) facing each other, characterized in that: A cylinder body (12) is fixed on the side of the fixed plate (1) facing the upper mold (2), a piston (13) is slidably arranged in the cylinder body (12), the piston (13) is fixed to the upper mold (2), the cylinder body (12) is connected to an air pipe (15), an air cavity (32) is provided in the lower mold (3), a sliding member (4) is slidably arranged in the air cavity (32), both end side walls of the sliding member (4) are provided with sealing rings (44), the air pipe (15) is connected to the lower side of the sliding member (4) in the air cavity (32), the sliding member (4) includes an inclined inclined rod (43), the outer sleeve of the inclined rod (43) is provided with a sliding ring (51), a pull rod (52) is fixed to the sliding ring (51), a side core (5) is fixed to the end of the pull rod (52), and the side core (5) is slidably connected to the lower mold (3).

2. A side core-pulling blow molding mold according to claim 1, characterized in that: The sliding member (4) comprises cylindrical blocks (41) at the upper and lower ends, the sealing ring (44) is sleeved outside the cylindrical block (41), and the cylindrical block (41) is slidably sealed with the inner wall of the air cavity (32) through the sealing ring (44).

3. A side core-pulling blow molding mold according to claim 1, characterized in that: The sliding member (4) further comprises a vertical rod (42) arranged vertically, wherein the lower end of the vertical rod (42) is fixed to the upper end of the oblique rod (43).

4. A side core-pulling blow molding mold according to claim 1, characterized in that: The air cavity (32) penetrates upward to the top surface of the lower mold (3); the upper end of the air cavity (32) is threadedly connected to a locking cover (6); and a vent hole (62) is provided at the center of the locking cover (6).

5. A side core-pulling blow molding mold according to claim 4, characterized in that: A spring (61) is provided between the locking cover (6) and the upper end of the sliding member (4).

6. A side core-pulling blow molding mold according to claim 1, characterized in that: The lower mold (3) is provided with a sliding hole (33) for the side core (5) to slide, and the lower mold (3) is provided with a bypass hole (34) connecting the hole wall of the sliding hole (33) and the air cavity (32). After the sliding member (4) slides upward, the sealing ring (44) below moves to above the end of the sliding hole (33).

7. A side core-pulling blow molding mold according to claim 6, characterized in that: The piston (13) is annular, and a valve plate (14) is movably provided on the top surface of the piston (13). The valve plate (14) is connected to the piston (13) via a rubber portion on one side.

8. The side core-pulling blow molding mold according to claim 1, characterized in that: The guide rod (11) is hollow inside and has two ends that are connected, and the air pipe (15) passes through the guide rod (11).

9. A production process for side core blow molding, characterized in that: A side core-pulling blow molding mold according to any one of claims 1 to 8 is used, comprising the following steps: Step S1: The upper mold (2) is driven to move by the oil cylinder, and after the mold is closed, the side core (5) is inserted into the mold cavity (31), and the blow molding head blows air to perform blow molding; Step S2: After the plastic solidifies, the mold is opened and the upper mold (2) moves upward. During this process, the piston (13) is inserted into the cylinder (12) and squeezes the air in the cylinder (12). The gas enters the lower end of the air cavity (32) through the air pipe (15), driving the sliding member (4) to move upward; Step S3: During the upward movement of the sliding member (4), the inclined rod (43) pulls the side core (5) away from the cavity (31), completing the side core pulling.

10. A side core-pulling blow molding production process according to claim 9, characterized in that: In step S3, after the side core pulling is completed, as the sliding member (4) continues to move upward, the sealing ring (44) moves to above the port of the bypass hole (34), and the air in the lower part of the air cavity (32) enters the mold cavity (31) through the bypass hole (34) and the sliding hole (33) to perform air blowing and demoulding.

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