A forming mold for a hollow double-layer plastic bottle and its forming process

Abstract

The present invention relates to the field of plastic bottle molding technology, and discloses a molding die for a hollow double-layer plastic bottle and a molding process thereof, wherein a molding die for a hollow double-layer plastic bottle comprises two outer molding dies, an inner molding die, a support component 1, a support component 2, an adjustment component 1, an adjustment component 2, a vent pipe, a circular plate and a U-shaped plate; the adjustment component 1 is arranged on the U-shaped plate, the two outer molding dies are both arranged on the adjustment component 1, the two outer molding dies are both provided with outer mold cavities on the sides close to each other, the two outer molding dies are both provided with semicircular grooves on the tops on the sides close to each other, the inner molding die is arranged in the two outer mold cavities and is adapted to the two semicircular grooves. The present invention has a reasonable design, which not only improves production efficiency and product quality, but also reduces production costs, and can achieve rapid demoulding and can quickly adjust the volume of the hollow double-layer plastic bottle after molding according to actual production needs.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bottle molding, in particular to a molding die for a hollow double-layer plastic bottle and a molding process thereof. Background Art

[0002] A molding mold is required for the processing of hollow double-layer plastic bottles. Due to its hollow double-layer design, it is different from the production of ordinary plastic bottles. During the molding process, special attention must be paid to the structural design of the mold and the control of the molding process. The molding mold usually consists of an inner molding mold and an outer molding mold. The inner molding mold is responsible for forming the inner layer of the plastic bottle, while the outer molding mold is responsible for forming the outer layer. During the molding process, the inner molding mold is first positioned in the appropriate position, and then the outer molding mold is closed to squeeze the plastic raw material between the inner and outer molds. Due to the special structure of the hollow double-layer plastic bottle, the molding mold must be able to accurately control the fit of the inner and outer layers to ensure the strength and sealing of the bottle body.

[0003] However, when traditional molding molds are used in the processing of double-layer hollow plastic bottles, there are certain inconveniences in the demoulding operation of the inner molding mold, and it does not have the function of quickly adjusting the capacity of the hollow double-layer plastic bottle according to actual production needs.

[0004] Therefore, the present invention proposes a novel forming mold and forming process of a hollow double-layer plastic bottle. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a forming mold for a hollow double-layer plastic bottle and a forming process thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A forming mold for a hollow double-layer plastic bottle, comprising two outer forming molds, an inner forming mold, a first supporting component, a second supporting component, a first adjusting component, a second adjusting component, a vent pipe, a circular plate, and a U-shaped plate;

[0008] The adjusting component 1 is arranged on the U-shaped plate, and the two outer forming molds are both arranged on the adjusting component 1. The two outer forming molds are both provided with an outer mold cavity on the side close to each other, and the two outer forming molds are both provided with a semicircular groove on the top on the side close to each other. The inner forming mold is arranged in the two outer mold cavities and is adapted to the two semicircular grooves, and the inner forming mold is an airbag, and a plurality of air holes are provided on the inner forming mold. The circular plate is fixedly mounted on the top of the inner forming mold, and the ventilation pipe is fixedly mounted on the circular plate and is connected to the inner mold cavity of the inner forming mold. The supporting component 1 and the supporting component 2 are both arranged in the inner forming mold, and the adjusting component 2 is arranged on the circular plate and connected to the supporting component 1 and the supporting component 2.

[0009] Preferably, the adjustment component 1 includes two support plates, a bidirectional screw and a servo motor. The bidirectional screw is rotatably installed on the U-shaped plate, and two support plates are slidably installed on the top side of the U-shaped plate. The two support plates are respectively fixedly connected to the corresponding external forming molds, and the two support plates are both threadedly connected to the bidirectional screw. The servo motor is fixedly installed on the U-shaped plate, and the output shaft of the servo motor is axially fixedly connected to the bidirectional screw.

[0010] Preferably, a plurality of guide rods parallel to the bidirectional screw rod are fixedly mounted on the U-shaped plate, and the plurality of guide rods are all slidably connected to the two support plates.

[0011] Preferably, the support assembly includes multiple arc-surface support plates, multiple support rods, multiple mounting blocks and multiple rotating pins. Multiple arc-surface support plates are fixedly mounted on the inner wall of the inner forming mold. Support rods are hingedly mounted on the inner arc surfaces of the multiple arc-surface support plates. Rotating pins are radially fixedly mounted on the ends of the multiple support rods that are close to each other, and the same mounting block is rotatably mounted on the multiple rotating pins.

[0012] Preferably, the supporting component 1 further includes a plurality of gears, and the plurality of rotating pins are all fixedly sleeved with gears, and the two gears located in the same plane are arranged in a mutually meshing state.

[0013] Preferably, the support assembly 2 includes a mounting block 2, multiple support rods 2 and multiple support pins, and the inner arc surfaces of the multiple arc support plates are hingedly mounted with support rods 2, and the ends of the multiple support rods 2 close to each other are hingedly mounted with the same mounting block 2, and the mounting block 2 and the mounting block 1 are displaced on the same axis.

[0014] Preferably, the second adjustment component includes a servo motor and an adjustment screw. The servo motor is fixedly installed on the bottom side of the circular plate. The adjustment screw is axially fixedly connected to the output shaft of the servo motor. The adjustment screw is rotatably connected to the second mounting block, and the adjustment screw is threadedly connected to the first mounting block.

[0015] Preferably, the outer side of the inner molding die is coated with a heat insulation layer.

[0016] Preferably, the corners of the arc-surface support plate are rounded.

[0017] The present invention also provides a method for forming a mold for a hollow double-layer plastic bottle, comprising the following steps:

[0018] S1: First, turn on the power and start the servo motor. Then, place the inner molding die between the two outer molding dies. Transfer the softened raw material for plastic bottle processing along the circular plate and the outer side of the inner molding die into the two outer mold cavities. Then, the servo motor controls the rotation of the bidirectional screw, so that the two support plates drive the corresponding outer molding dies to move toward each other and maintain a sealed state. Air is blown into the inner molding die through the vent pipe, so that the softened raw material is blown up and close to the outer mold cavities.

[0019] S2: Then, air is sucked through the vent pipe, causing the airbag-shaped inner molding die to shrink and disengage from the inner walls of the two semicircular grooves, and the softened raw material is transported to the outer mold cavity again. Then, the servo motor controls the adjustment screw to drive the mounting block 1 to move, so that the positions of the multiple arc-surface support plates can be controlled under the cooperation of the support rods 1 and 2 and gears and other components, and then the inner molding die can be adjusted to the inner diameter size position required for the plastic bottle processing and the outer side of the inner molding die is kept in close contact with the inner wall of the semicircular groove, so that the inner layer and the outer layer of the hollow plastic bottle can be kept in a state of adhesion at the bottle mouth position. Then, air is sucked through the vent pipe, so that the raw material fed into the outer mold cavity for the second time is adsorbed and closely adheres to the outer side of the inner molding die, thereby realizing the molding operation of the hollow double-layer plastic bottle;

[0020] S3: After the hollow double-layer plastic bottle is formed and cooled, air is extracted through the vent pipe, and the servo motor is controlled to rotate in the opposite direction. This can control the arc support plate to drive the inner molding die to shrink and separate from the inner side of the inner layer of the formed hollow double-layer plastic bottle. Then, the inner molding die is controlled to move out from the bottle mouth, and the servo motor is controlled to rotate in the opposite direction to make the two outer molding dies move away from each other, so that the demolding operation of the formed hollow double-layer plastic bottle can be completed quickly.

[0021] Compared with the prior art, the present invention provides a forming mold and forming process for a hollow double-layer plastic bottle, which has the following beneficial effects:

[0022] 1. Improved molding efficiency and enhanced operational convenience. By precisely controlling the movement of the inner molding die, the bonding of the inner and outer layers of the plastic bottle at the bottle mouth is ensured, reducing the scrap rate during the molding process. At the same time, through the coordinated use of the servo motor and the adjusting screw, the size of the inner molding die can be quickly adjusted, simplifying the operating process, reducing the difficulty of operation, and enabling operators to perform production operations more conveniently.

[0023] 2. Reduced production costs. Due to the structural optimization and process improvement of the molding mold, the molding process is more stable and the waste of raw materials is reduced.

[0024] 3. Rapid demoulding is achieved. Through the reverse rotation of the servo motor and the cooperation of the arc support plate, the formed plastic bottle can be quickly removed from the mold, thereby improving production efficiency.

[0025] In summary, the hollow double-layer plastic bottle molding mold and its molding process of the present invention not only improve production efficiency and product quality, but also reduce production costs, and can achieve rapid demolding and can quickly adjust the volume of the hollow double-layer plastic bottle after molding according to actual production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a forming mold for a hollow double-layer plastic bottle proposed in the present invention;

[0027] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure;

[0028] Figure 3 This is a schematic diagram of the partial three-dimensional structure of a hollow double-layer plastic bottle proposed by the present invention;

[0029] Figure 4 This is a schematic diagram of the inner forming mold, circular plate, vent pipe and air hole part of a hollow double-layer plastic bottle proposed by the present invention;

[0030] Figure 5 This is a structural schematic diagram of the inner and outer forming molds and the outer mold cavity of a hollow double-layer plastic bottle proposed by the present invention.

[0031] In the figure: 1. External forming mold; 11. External mold cavity; 12. Semicircular groove; 2. U-shaped plate; 21. Support plate; 22. Bidirectional screw; 23. Servo motor; 24. Guide rod; 3. Internal forming mold; 301. Air hole; 302. Internal mold cavity; 31. Circular plate; 32. Ventilation pipe; 33. Arc support plate; 331. Support rod 1; 332. Mounting block 1; 3321. Gear; 333. Support rod 2; 334. Mounting block 2; 34. Adjusting screw; 35. Servo motor. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] Reference Figure 1-5, a forming mold for a hollow double-layer plastic bottle, comprising two outer forming molds 1, an inner forming mold 3, a vent pipe 32, a circular plate 31 and a U-shaped plate 2, an adjusting component 1 is arranged on the U-shaped plate 2, a bidirectional screw rod 22 is rotatably installed on the U-shaped plate 2, two support plates 21 are slidably installed on the top side of the U-shaped plate 2, the two support plates 21 are respectively fixedly connected to the corresponding outer forming molds 1, the two support plates 21 are both threadedly connected to the bidirectional screw rod 22, a servo motor 23 is fixedly installed on the U-shaped plate 2, the output shaft of the servo motor 23 is axially fixedly connected to the bidirectional screw rod 22, and can control the two outer forming molds 1 to open and close, the two outer forming molds 1 are each provided with an outer mold cavity 11 on the side close to each other, and the top of the two outer forming molds 1 on the side close to each other is provided with a semicircular shaped groove 12, the inner molding mold 3 is arranged in the two outer mold cavities 11 and is adapted to the two semicircular grooves 12, and the inner molding mold 3 is an air bag. In order to avoid damage to the inner molding mold 3 caused by high temperature, the outer side of the inner molding mold 3 is coated with a heat insulation layer. In order to facilitate the air injected into the inner mold cavity 302 by the vent pipe 32 and guided into the outer mold cavity 11, so that the outer molding mold 1 and the inner molding mold 3 can cooperate with the outer molding mold 1 and the inner molding mold 3 to perform blowing and suction operations on the plastic, thereby realizing the manufacture of hollow double-layer plastic bottles, a plurality of air holes 301 are opened on the inner molding mold 3, a circular plate 31 is fixedly mounted on the top of the inner molding mold 3, the vent pipe 32 is fixedly mounted on the circular plate 31 and is connected to the inner mold cavity 302 of the inner molding mold 3, and a plurality of arc support plates 33 are fixedly mounted on the inner wall of the inner molding mold 3. The cam 331 is fixed on the inner camber of each camber support plate 33, and the ends of the cam 331 close to each other are radially fixed with a rotating pin, and the same mounting block 332 is rotatably mounted on the multiple rotating pins, which can provide support for the camber support plate 33 and can adjust the spacing between the multiple camber support plates 33 when the mounting block 332 changes position. The multiple rotating pins are fixed with a gear 3321, and the two gears 3321 located in the same plane are arranged in a meshing state with each other, which can ensure that the two cam 331 located in the same plane maintain synchronous reverse deflection, thereby ensuring that the spacing between the multiple camber support plates 33 and the mounting block 332 remains consistent. There is a support rod 2 333, and the same mounting block 2 334 is hingedly installed at one end of multiple support rods 2 333 close to each other. The mounting block 2 334 and the mounting block 1 332 are displaced on the same axis, which can provide stable support for the arc support plate 33. A servo motor 35 is fixedly installed on the bottom side of the circular plate 31, and an adjusting screw rod 34 is axially fixedly connected to the output shaft of the servo motor 35. The adjusting screw rod 34 is rotatably connected to the mounting block 2 334, and the adjusting screw rod 34 is threadedly connected to the mounting block 1 332, which can cooperate with the support rod 1 331 and the support rod 2 333 to adjust the spacing between multiple arc support plates 33 fixedly installed on the inner wall of the inner molding mold 3, thereby facilitating the adjustment of the size of the hollow part of the produced hollow double-layer plastic bottle and the capacity of the plastic bottle after molding.

[0035] In this embodiment, in order to ensure that the two support plates 21 slide stably on the top side of the U-shaped plate 2, a plurality of guide rods 24 parallel to the bidirectional screw rod 22 are fixedly installed on the U-shaped plate 2, and the plurality of guide rods 24 are all slidably connected to the two support plates 21.

[0036] In this embodiment, in order to prevent the corners of the arc-surface support plate 33 from scratching the inner forming mold 3 when the inner forming mold 3 contracts, the corners of the arc-surface support plate 33 are chamfered.

[0037] This embodiment also provides a method for using a forming mold for a hollow double-layer plastic bottle, comprising the following steps:

[0038] S1: First, turn on the power and start the servo motor 23, place the inner forming mold 3 between the two outer forming molds 1, and convey the softened raw material along the circular plate 31 and the outer side of the inner forming mold 3 into the two outer mold cavities 11. Then, the servo motor 23 controls the rotation of the bidirectional screw 22, so that the two support plates 21 drive the corresponding outer forming molds 1 to move toward each other and maintain a sealed state. Air is blown into the inner forming mold 3 through the vent pipe 32, so that the softened raw material is blown up and close to the outer mold cavity 11.

[0039] S2: Then, air is sucked through the vent pipe 32, causing the airbag-shaped inner molding die 3 to shrink and disengage from the inner walls of the two semicircular grooves 12, and the softened raw material is transported into the outer mold cavity 11 again. Then, the servo motor 35 controls the adjustment screw 34 to drive the mounting block 1 332 to move, so that the positions of the multiple arc-surface support plates 33 can be controlled under the cooperation of the support rod 1 331 and the support rod 2 333 and the gear 3321 and other components, and then the inner molding die 3 can be adjusted to the inner diameter size position required for the plastic bottle processing and the outer side of the inner molding die 3 is kept in close contact with the inner wall of the semicircular groove 12, so that the inner layer and the outer layer of the hollow plastic bottle can be kept in a state of being stuck together at the bottle mouth position, and then air is sucked through the vent pipe 32, so that the raw material fed into the outer mold cavity 11 for the second time is adsorbed and closely adheres to the outer side of the inner molding die 3, thereby realizing the molding operation of the hollow double-layer plastic bottle;

[0040] S3: After the hollow double-layer plastic bottle is formed and cooled to a state where it can be demolded, air is extracted through the vent pipe 32, and at the same time, the servo motor 35 is controlled to rotate in the opposite direction, so that the arc support plate 33 can be controlled to drive the inner molding die 3 to shrink and separate from the inner side of the inner layer of the molded hollow double-layer plastic bottle, and then it can be controlled to move out from the bottle mouth. The servo motor 23 is then controlled to rotate in the opposite direction, so that the two outer molding dies 1 move away from each other, so that the demolding operation of the molded hollow double-layer plastic bottle can be completed quickly.

[0041] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

Claims

1. A forming mold for a hollow double-layer plastic bottle, comprising two outer forming molds (1), an inner forming mold (3), a first supporting component, a second supporting component, a first adjusting component, a second adjusting component, a vent pipe (32), a circular plate (31), and a U-shaped plate (2); The adjustment component 1 is arranged on the U-shaped plate (2), the two outer forming molds (1) are both arranged on the adjustment component 1, the sides of the two outer forming molds (1) close to each other are both provided with outer mold cavities (11), the tops of the sides of the two outer forming molds (1) close to each other are both provided with semicircular grooves (12), the inner forming mold (3) is arranged in the two outer mold cavities (11) and is adapted to the two semicircular grooves (12), and the inner forming mold (3) is an air bag, a plurality of air holes (301) are provided on the inner forming mold (3), the circular plate (31) is fixedly mounted on the top of the inner forming mold (3), the vent pipe (32) is fixedly mounted on the circular plate (31) and is communicated with the inner mold cavity (302) of the inner forming mold (3), the support component 1 and the support component 2 are both arranged in the inner forming mold (3), the adjustment component 2 is arranged on the circular plate (31) and is connected to the support component 1 and the support component 2; The support assembly comprises a plurality of arc-surface support plates (33), a plurality of support rods (331), a plurality of mounting blocks (332) and a plurality of rotating pins. The plurality of arc-surface support plates (33) are fixedly mounted on the inner wall of the inner forming mold (3). The plurality of arc-surface support plates (33) are hingedly mounted with support rods (331) on the inner arc surfaces. The plurality of support rods (331) are radially fixedly mounted with rotating pins at their ends close to each other. The same mounting block (332) is rotatably mounted on the plurality of rotating pins. The support assembly 2 includes a mounting block 2 (334), a plurality of support rods 2 (333) and a plurality of support pins. The inner arc surfaces of the plurality of arc support plates (33) are hingedly mounted with support rods 2 (333). The ends of the plurality of support rods 2 (333) close to each other are hingedly mounted with the same mounting block 2 (334). The mounting block 2 (334) and the mounting block 1 (332) are displaced on the same axis. The second adjustment component includes a servo motor (35) and an adjustment screw (34). The servo motor (35) is fixedly installed on the bottom side of the circular plate (31). The output shaft of the servo motor (35) is axially fixedly connected to the adjustment screw (34). The adjustment screw (34) is rotationally connected to the second mounting block (334), and the adjustment screw (34) is threadedly connected to the first mounting block (332).

2. The forming mold for a hollow double-layer plastic bottle according to claim 1, characterized in that: The adjustment component 1 comprises two support plates (21), a bidirectional screw rod (22) and a servo motor (23); the bidirectional screw rod (22) is rotatably mounted on the U-shaped plate (2); the top side of the U-shaped plate (2) is slidably mounted with two support plates (21); the two support plates (21) are respectively fixedly connected to the corresponding outer forming mold (1); the two support plates (21) are both threadedly connected to the bidirectional screw rod (22); the servo motor (23) is fixedly mounted on the U-shaped plate (2); the output shaft of the servo motor (23) is axially fixedly connected to the bidirectional screw rod (22).

3. The forming mold for a hollow double-layer plastic bottle according to claim 2, characterized in that: A plurality of guide rods (24) parallel to the bidirectional screw rod (22) are fixedly mounted on the U-shaped plate (2), and the plurality of guide rods (24) are all slidably connected to the two support plates (21).

4. The forming mold for a hollow double-layer plastic bottle according to claim 1, characterized in that: The supporting assembly 1 further comprises a plurality of gears (3321), and the plurality of rotating pins are all fixedly sleeved with gears (3321), and two gears (3321) located in the same plane are arranged in a mutually meshing state.

5. The forming mold for a hollow double-layer plastic bottle according to claim 1, characterized in that: The outer side of the inner forming mold (3) is coated with a heat insulation layer.

6. The forming mold for a hollow double-layer plastic bottle according to claim 1, characterized in that: The corners of the arc-surface support plate (33) are rounded.

7. A forming mold and forming process for a hollow double-layer plastic bottle according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: First, power is turned on and the servo motor (23) is started. Then, the inner molding die (3) is placed between the two outer molding dies (1). The softened raw material for plastic bottle processing is conveyed along the circular plate (31) and the outer side of the inner molding die (3) into the two outer mold cavities (11). Then, the servo motor (23) controls the rotation of the bidirectional screw rod (22) so that the two support plates (21) drive the corresponding outer molding dies (1) to move toward each other and maintain a sealed and tight state. Air is blown into the inner molding die (3) through the vent pipe (32) so that the softened raw material is blown up and close to the outer mold cavity (11). S2: Then, air is sucked through the vent pipe (32), causing the airbag-shaped inner molding die (3) to shrink and break away from the inner walls of the two semicircular grooves (12), and the softened raw material is transported into the outer mold cavity (11) again. Then, the servo motor (35) controls the adjusting screw (34) to drive the installation block 1 (332) to move, thereby being able to control the position of the multiple arc-surface support plates (33) under the cooperation of the support rod 1 (331) and the support rod 2 (333) and the gear (3321). The inner forming mold (3) can be adjusted to the position of the inner diameter size required for the processing of the plastic bottle, and the outer side of the inner forming mold (3) is kept in close contact with the inner wall of the semicircular groove (12), so that the inner layer and the outer layer of the hollow plastic bottle can be kept in a state of being stuck together at the bottle mouth. Then, air is sucked through the vent pipe (32), so that the raw materials fed into the outer mold cavity (11) for the second time are adsorbed and closely attached to the outer side of the inner forming mold (3), thereby realizing the molding operation of the hollow double-layer plastic bottle; S3: After the hollow double-layer plastic bottle is formed and cooled, air is extracted through the vent pipe (32) and the servo motor (35) is controlled to rotate in the reverse direction, thereby controlling the arc support plate (33) to drive the inner forming mold (3) to shrink and separate from the inner side of the inner layer of the formed hollow double-layer plastic bottle. Then, the inner forming mold (3) is controlled to move out from the bottle mouth, and the servo motor (23) is controlled to rotate in the reverse direction, so that the two outer forming molds (1) move away from each other, thereby quickly completing the demoulding operation of the formed hollow double-layer plastic bottle.

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