A low-pressure blow molding die for lightweight PET bottles

Abstract

This utility model belongs to the field of PET bottle production technology, and in particular to a low-pressure blow molding mold for lightweight PET bottles. It includes a base, with two support plates fixed to the top of the base. A hydraulic cylinder is fixed to one side wall of each support plate. Two guide rails are fixed to the top of the base, and two mounting seats slide on the guide rails. This utility model allows for locking and limiting the left and right molds by inserting the left and right molds into one side of the mounting seats and then operating the bidirectional screws inside the mounting seats to move the locking blocks. This makes it easier to change blow molding molds with different molding cavities later. Furthermore, the self-locking component locks and limits the bidirectional screws after operation, preventing rotation when not in use. The auxiliary support component provides support during mold assembly and disassembly, improving the convenience for workers.

Description

Technical Field

[0001] This utility model relates to the field of PET bottle production technology, specifically to a low-pressure blow molding mold for lightweight PET bottles. Background Technology

[0002] Lightweight PET bottles are polyethylene terephthalate (PET) packaging containers whose weight is reduced through optimized design and manufacturing processes. While maintaining their original functions (such as strength, sealing, and barrier properties), they reduce material usage, thereby lowering production costs and environmental impact. Currently, during the blow molding process of PET bottles, a heated preform is typically fed into a blow mold, compressed gas is injected to inflate it, and the preform expands to fit the inner wall of the mold, forming the final bottle shape. However, blow molding dies used to produce PET bottles are usually fixed with bolts. Due to the variety of PET bottle shapes, changing blow molding dies for different PET bottle products later on presents many inconveniences. Therefore, we propose a low-pressure blow molding die for lightweight PET bottles to solve the above problems. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a low-pressure blow molding die for lightweight PET bottles, solving the problems mentioned in the background section.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A low-pressure blow molding mold for lightweight PET bottles includes a base. Two support plates are fixed to the top of the base. A hydraulic cylinder is fixed to one side wall of each support plate. Two guide rails are fixed to the top of the base, and two mounting seats slide on the guide rails. The ejector end of each hydraulic cylinder slides through the support plate to the other side and is fixedly connected to the corresponding mounting seat. A left mold is inserted into one side of one mounting seat, and a right mold is inserted into one side of the other mounting seat. Both the left and right molds have four slots. The interior of each mounting seat slides... There are four locking blocks that are adapted to the slots. One end of each locking block is inserted into the corresponding slot. The interior of the mounting base is rotatably connected to a two-way lead screw via bearings. Both ends of the two-way lead screws are threaded to a movable plate that is adapted to the thread on its surface. The movable plate slides inside the mounting base. One side wall of each movable plate is rotatably connected to two connecting rods via pins. The other end of each connecting rod is rotatably connected to a corresponding locking block via pins. One side wall of the mounting base is equipped with a self-locking assembly for locking and limiting the two-way lead screws.

[0008] Furthermore, the self-locking assembly includes a retaining ring 1 that slides on the surface of the limiting sliding bidirectional lead screw, a retaining ring 2 that is fixed to one side wall of the mounting base, the retaining ring 1 and the retaining ring 2 being engaged and connected, a guide seat that is fixed to one side wall of the mounting base, a rotating ring that is rotatably connected to the guide seat, and two springs and two telescopic sleeves 1 that are fixed to one side wall of the rotating ring, the other ends of the two springs and the other ends of the two telescopic sleeves 1 being fixedly connected to the retaining ring 1.

[0009] Furthermore, two telescopic covers for protecting the spring are fixed to one side wall of the rotating ring, and the other end of each telescopic cover is fixedly connected to a retaining ring.

[0010] Furthermore, the base is equipped with an auxiliary support assembly for supporting the left and right molds during assembly and disassembly. The auxiliary support assembly includes a second hydraulic cylinder fixed to the base. An L-shaped plate is fixed to the ejector end of the second hydraulic cylinder. Four guide rods are fixed to the bottom of the L-shaped plate. The bottom ends of the guide rods are all fixedly connected to the base.

[0011] Furthermore, each mounting base has two fixed limiting rods inside, and the movable plate slides on the surface of the corresponding limiting rod.

[0012] Furthermore, both the left and right molds have rubber seals that are adapted to their shapes fixed on their arc-shaped air inlet pipes.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a low-pressure blow molding die for lightweight PET bottles, which has the following beneficial effects:

[0015] This invention allows for the locking and limiting of the left and right molds by inserting them into one side of the mounting base and then operating the bidirectional screws inside the mounting base to move the locking blocks. This makes it easier to operate when changing blow molding dies with different molding cavities later. Furthermore, the self-locking component can lock and limit the bidirectional screws after operation to prevent them from rotating when not in use. The auxiliary support component can also provide auxiliary support during the assembly and disassembly of the blow molding die, improving the convenience for workers. Attached Figure Description

[0016] Figure 1 This is a first-view schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a second-view schematic diagram of the overall structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the left and right mold structures of this utility model;

[0019] Figure 4 This is a schematic diagram of the mounting base structure of this utility model;

[0020] Figure 5 This is a structural diagram of the internal structure of the mounting base of this utility model;

[0021] Figure 6 This is a schematic diagram of the self-locking component structure of this utility model;

[0022] Figure 7 This is a cross-sectional view of the self-locking component structure of this utility model.

[0023] In the diagram: 1. Base; 2. Support plate; 3. Hydraulic cylinder one; 4. Guide rail; 5. Mounting seat; 6. Left mold; 7. Right mold; 8. Slot; 9. Locking block; 10. Two-way lead screw; 11. Moving plate; 12. Connecting rod; 13. Self-locking assembly; 1301. Snap ring one; 1302. Snap ring two; 1303. Guide seat; 1304. Rotating ring; 1305. Spring; 1306. Telescopic sleeve; 1307. Telescopic cover; 14. Auxiliary support assembly; 1401. Hydraulic cylinder two; 1402. L-shaped plate; 1403. Guide rod; 15. Limiting rod; 16. Rubber seal. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown in the figure, an embodiment of this utility model provides a low-pressure blow molding die for lightweight PET bottles, including a base 1. Two support plates 2 are fixed to the top of the base 1. A hydraulic cylinder 3 is fixed to one side wall of each support plate 2. Two guide rails 4 are fixed to the top of the base 1, and two mounting seats 5 slide on the guide rails 4. The ejector end of the hydraulic cylinder 3 slides through the support plate 2, extends to the other side, and is fixedly connected to the corresponding mounting seat 5. A left mold 6 is inserted into one side of one mounting seat 5, and a right mold 7 is inserted into one side of the other mounting seat 5. Rubber seals 16, adapted to the shape of the arc-shaped air inlet pipes of both the left mold 6 and the right mold 7 are fixed. The rubber seals 16 further enhance the molding die during blow molding. To ensure sealing performance, four slots 8 are provided on both the left mold 6 and the right mold 7. Four locking blocks 9, each matching the slots 8, slide inside the mounting base 5. One end of each locking block 9 is inserted into the corresponding slot 8. A double-acting lead screw 10 is rotatably connected to the inside of each mounting base 5 via bearings. Both ends of the two double-acting lead screws 10 are threadedly connected to movable plates 11 whose threads are matched. The movable plates 11 slide inside the mounting base 5. Two limiting rods 15 are fixed inside each mounting base 5. The movable plates 11 slide on the surfaces of the corresponding limiting rods 15, which limit and guide the movable plates 11. Therefore, when the double-acting lead screw 10 rotates and drives the movable plates 11 to move, it prevents the movable plates 11 from rotating synchronously with it. One side wall of the mounting base 5 is rotatably connected to two connecting rods 12 via pins. The other end of the connecting rods 12 is rotatably connected to corresponding locking blocks 9 via pins. One side wall of the mounting base 5 is equipped with a self-locking assembly 13 for locking and limiting the bidirectional lead screw 10. In the process of using this lightweight PET bottle low-pressure blow molding mold, since the working principle of PET bottle blow molding is existing technology, it will not be described in detail here. When it is necessary to remove the left mold 6 and the right mold 7 for replacement, the self-locking hydraulic cylinders 3 on both sides can be operated simultaneously to drive the mounting base 5 to the middle position. At this time, the left mold 6 and the right mold 7 will be snapped together. Then, a structure is provided on the base 1 to support the left mold 6 and the right mold 7 after they are snapped together. Next, first operate the self-locking component 13 on the left mounting base 5 to release the restriction on the bidirectional lead screw 10 and then rotate it. When the bidirectional lead screw 10 rotates, it drives the two moving plates 11 to move synchronously in opposite directions. After the moving plates 11 move, they can drive the vertical locking block 9 to move with the cooperation of the connecting rod 12. At this time, when the locking block 9 moves, it will disengage from the locking groove 8. Repeat the above operation to release the restriction on the right mold 7, and then the hydraulic cylinder 3 can be started again to drive the mounting base 5 to move and reset. Then the blow molding mold can be removed. During installation, the fitted left mold 6 and right mold 7 can be placed on the support structure of the base 1. Then the hydraulic cylinders 3 on both sides can be operated simultaneously to drive the mounting base 5 to move to the middle position. When the left mold 6 and right mold 7 are fitted with the box body,Subsequently, by rotating the bidirectional lead screw 10, the locking block 9 can be re-engaged into the slot 8, thereby limiting and fixing the installed left mold 6 and right mold 7.

[0027] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, the self-locking assembly 13 includes a retaining ring 1301 that slides on the surface of the limiting sliding bidirectional lead screw 10. A retaining ring 1302 is fixed to one side wall of the mounting base 5. The retaining ring 1301 and retaining ring 1302 are engaged. A guide seat 1303 is fixed to one side wall of the mounting base 5. A rotating ring 1304 is rotatably connected to the guide seat 1303. Two springs 1305 and two telescopic sleeves 1306 are fixed to one side wall of the rotating ring 1304. Two telescopic covers 1307 for protecting the springs 1305 are fixed to one side wall of the rotating ring 1304. The other end of each telescopic cover 1307 is fixedly connected to the retaining ring 1301, which can protect the springs 1305 and thus extend their service life. The other ends of the two springs 1305 and the other ends of the two telescopic sleeves 1306 are fixedly connected to the retaining ring 1301, so that... When in use, by operating the retaining ring 1301 that slides on the surface of the bidirectional lead screw 10 to a certain distance, the two springs 1305 will be stretched after the retaining ring 1301 is pulled, and the retaining ring 1301 will disengage from the retaining ring 1302. Then, the operator can pull the retaining ring 1301 and rotate it at the same time. Since the retaining ring 1301 is sliding on the surface of the bidirectional lead screw 10, the bidirectional lead screw 10 can be driven to rotate. After the rotation is completed, the retaining ring 1301 can be released. Then, under the restoring force of the stretched spring 1305, the retaining ring 1301 and the retaining ring 1302 can be re-engaged and connected. At this time, the bidirectional lead screw 10 can be self-locked and limited. The two telescopic sleeves 1306 make it more stable to drive the rotating ring 1304 to rotate synchronously when the retaining ring 1301 rotates.

[0028] like Figure 1As shown, in some embodiments, an auxiliary support assembly 14 is installed on the base 1 to support the left mold 6 and the right mold 7 during disassembly and assembly. The auxiliary support assembly 14 includes a hydraulic cylinder 2 1401 fixed on the base 1. An L-shaped plate 1402 is fixed to the ejector end of the hydraulic cylinder 2 1401. Four guide rods 1403 are fixed to the bottom of the L-shaped plate 1402. The bottom ends of the guide rods 1403 are all fixedly connected to the base 1. In use, the L-shaped plate 1402 can be pushed upward by starting the hydraulic cylinder 2 1401. At this time, most of the left mold 6 and the right mold 7, after being pushed to the middle position of the base 1 and fitting together, will be located on the L-shaped plate 1402. Thus, after the mounting seat 5 releases the restriction on the two molds, the operator can then slide the molds off the L-shaped plate 1402. The guide rods 1403 can provide auxiliary support for the L-shaped plate 1402 to enhance its stability during movement.

[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-pressure blow molding mold for lightweight PET bottles, comprising a base (1), characterized in that: The base (1) has two support plates (2) fixed to its top. A hydraulic cylinder (3) is fixed to one side wall of each support plate (2). The base (1) has two guide rails (4) fixed to its top. Two mounting seats (5) slide on the two guide rails (4). The ejector end of the hydraulic cylinder (3) slides through the support plate (2) to its other side and is fixedly connected to the corresponding mounting seat (5). A left mold (6) is inserted into one side of one mounting seat (5), and a right mold (7) is inserted into one side of the other mounting seat (5). The left mold (6) and right mold (7) each have four slots (8). Four slots (8) that are compatible with the slots (8) slide inside each mounting seat (5). The locking block (9) has one end inserted into the corresponding slot (8). The mounting base (5) is rotatably connected to a two-way lead screw (10) through a bearing. Both ends of the two two-way lead screws (10) are threadedly connected to a movable plate (11) that matches the thread on its surface. The movable plate (11) slides inside the mounting base (5). One side wall of the movable plate (11) is rotatably connected to two connecting rods (12) through a pin. The other end of the connecting rod (12) is rotatably connected to the corresponding locking block (9) through a pin. One side wall of the mounting base (5) is equipped with a self-locking component (13) for locking and limiting the two-way lead screw (10).

2. The low-pressure blow molding mold for lightweight PET bottles according to claim 1, characterized by: The self-locking assembly (13) includes a retaining ring 1 (1301) that slides on the surface of the limiting sliding bidirectional lead screw (10). A retaining ring 2 (1302) is fixed on one side wall of the mounting base (5). The retaining ring 1 (1301) and retaining ring 2 (1302) are meshed together. A guide seat (1303) is fixed on one side wall of the mounting base (5). A rotating ring (1304) is rotatably connected to the guide seat (1303). Two springs (1305) and two telescopic sleeves 1 (1306) are fixed on one side wall of the rotating ring (1304). The other ends of the two springs (1305) and the other ends of the two telescopic sleeves 1 (1306) are fixedly connected to the retaining ring 1 (1301).

3. The low-pressure blow molding mold for lightweight PET bottles according to claim 2, characterized in that: Two telescopic covers (1307) for protecting the spring (1305) are fixed on one side wall of the rotating ring (1304), and the other end of each telescopic cover (1307) is fixedly connected to the retaining ring (1301).

4. The low-pressure blow molding mold for lightweight PET bottles according to claim 1, characterized by: The base (1) is equipped with an auxiliary support assembly (14) for supporting the assembly and disassembly of the left mold (6) and the right mold (7). The auxiliary support assembly (14) includes a hydraulic cylinder two (1401) fixed on the base (1). An L-shaped plate (1402) is fixed to the ejector end of the hydraulic cylinder two (1401). Four guide rods (1403) are fixed to the bottom of the L-shaped plate (1402). The bottom ends of the guide rods (1403) are all fixedly connected to the base (1).

5. The low pressure blow molding mold for lightweight PET bottle according to claim 1, characterized in that: The mounting base (5) has two limiting rods (15) fixed inside, and the moving plate (11) slides on the surface of the corresponding limiting rod (15).

6. The low pressure blow molding mold for lightweight PET bottle according to claim 1, characterized in that: The left die (6) and the right die (7) are fixed with rubber seals (16) matching their shapes on the arc-shaped air inlet pipes.

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