A plastic bucket blow molding device

Abstract

The utility model relates to blow molding technical field especially relates to a kind of blow molding forming device of plastic bucket.Blow molding forming device of plastic bucket includes base, installation hole is opened in base, two clamping structures of symmetrical distribution are installed on base, and two clamping structures are clamped between limit cylinder, slidingly connected with blow molding pipe in limit cylinder, and multiple-stage cylinder is fixedly installed on base, and the bottom of blow molding pipe is fixedly connected with the output end of multiple-stage cylinder, and the bottom end of blow molding pipe is fixedly installed with connector close thereto.The utility model is in the high-pressure blow molding process to plastic bucket, gradually rises from the rotating spray pipe and multiple-stage cylinder control, and it is inflated layer by layer to plastic bucket, avoid insufficient pressure bearing of barrel body, lateral air jet port on rotating spray pipe is laterally jetted to plastic bucket, avoid the problem that the lateral wall is unevenly stressed, wall thickness deviation caused by traditional vertical air jet, upper end air jet prevents barrel bottom from being concave, and the blow molding quality of plastic bucket is improved.

Description

Technical Field

[0001] This utility model relates to the field of blow molding technology, and in particular to a blow molding device for plastic buckets. Background Technology

[0002] Blow molding is an important plastic molding process. The core principle is to form a tubular preform from molten plastic raw material, then inflate it with compressed air to make it fit tightly against the inner wall of the mold. After cooling and solidification, a hollow plastic product is obtained. In the field of blow molding technology, plastic buckets are widely used in liquid storage and transportation scenarios in industries such as chemical, food, and daily chemical due to their advantages such as lightness, corrosion resistance, and low cost. Their molding quality directly affects the safety and service life of use.

[0003] Traditional blow molding equipment often uses a fixed vertical jet structure, where high-pressure airflow is sprayed vertically upward from the blow head and acts on the preform. Because the side wall of the preform (especially the transition area between the barrel mouth and the barrel body) is subjected to a single angle of airflow impact, localized stress concentration or blind spots of airflow coverage are likely to occur, resulting in uneven expansion of the preform and seriously affecting the molding quality of the plastic barrel.

[0004] Therefore, it is necessary to provide a new plastic bucket blow molding apparatus to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a new plastic bucket blow molding device.

[0006] The plastic bucket blow molding device provided by this utility model includes: a base, on which an installation hole is provided, two symmetrically distributed clamping structures are installed on the base, and a limiting cylinder is clamped between the two clamping structures, a blow molding tube is slidably connected in the limiting cylinder, a multi-stage cylinder is fixedly installed on the base, and the bottom of the blow molding tube is fixedly connected to the output end of the multi-stage cylinder, and a connector is fixedly installed near the bottom end of the blow molding tube;

[0007] The upper end of the blow molding tube is rotatably connected to a rotating nozzle. The rotating nozzle has multiple lateral air jets arranged in a ring, and the lateral air jets are inclined upwards from the inside to the outside. Multiple blades arranged in a ring are fixedly installed inside the rotating nozzle.

[0008] Preferably, the two clamping structures are symmetrically distributed. Each clamping structure includes a support plate that is vertically fixed on the base. A clamping cylinder is fixedly installed at the upper end of the support plate. A clamping piston rod is fixedly installed at the output end of the clamping cylinder. An arc-shaped clamping plate is fixedly installed at the end of the clamping piston rod away from the clamping cylinder. The limiting cylinder is clamped and fixed by the two symmetrically distributed arc-shaped clamping plates.

[0009] Preferably, both of the concave arc surfaces of the arc-shaped clamps are fixedly fitted with arc-shaped gaskets.

[0010] Preferably, a horizontally arranged sleeve is fixedly installed on the support plate, and the sleeve penetrates the support plate. An L-shaped support rod is fixedly installed at the lower end of the arc-shaped clamp, and the end of the L-shaped support rod away from the sleeve is inserted into the sleeve and slidably connected to it.

[0011] Preferably, a connecting frame is fixedly installed between the two support plates located on the two clamping structures.

[0012] Preferably, the upper end of the blow molding tube is provided with an annular groove, and an annular rotating block that is fixedly connected to the lower end of the rotating nozzle is rotatably connected in the annular groove.

[0013] Preferably, an annular groove is formed on the inner wall of the annular groove, and multiple balls are rolled in the annular groove.

[0014] Preferably, the maximum outer diameter of the rotating nozzle is smaller than the outer diameter of the blow molding tube.

[0015] Compared with related technologies, the plastic bucket blow molding device provided by this utility model has the following beneficial effects:

[0016] In the high-pressure blow molding process of plastic buckets, this utility model uses a self-rotating rotary nozzle and multi-stage cylinders to control its gradual rise, inflating the plastic bucket layer by layer to avoid insufficient pressure on the bucket body. The side air nozzles on the rotary nozzle spray the plastic bucket laterally, avoiding the problems of uneven side wall stress and wall thickness deviation caused by traditional vertical air spraying. The upper air spray prevents the bottom of the bucket from sinking, thus improving the blow molding quality of the plastic bucket. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the plastic bucket blow molding apparatus provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shows the structure of the clamping structure.

[0019] Figure 3 for Figure 1 The diagram shown is a structural schematic of the blow-molded tube.

[0020] Figure 4 for Figure 3 The diagram shows the structure at point A.

[0021] Figure 5 for Figure 1 The diagram shows the structure of the rotating nozzle.

[0022] Figure 6 for Figure 5 The diagram shows a semi-sectional view of the structure.

[0023] The following are the labels in the diagram: 1. Base; 11. Mounting hole; 2. Clamping structure; 21. Support plate; 22. Clamping cylinder; 23. Clamping piston rod; 24. Arc-shaped clamping plate; 241. Arc-shaped gasket; 25. Connecting frame; 26. Sleeve; 27. L-shaped support rod; 3. Limiting cylinder; 4. Blow-molded tube; 41. Connector; 42. Annular groove; 43. Annular roller groove; 44. Ball bearing; 5. Multi-stage cylinder; 6. Rotary nozzle; 61. Side air jet; 62. Blade; 63. Annular rotating block. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1 to 6 This utility model provides a plastic bucket blow molding device, which includes: a base 1, an installation hole 11 on the base 1, two symmetrically distributed clamping structures 2 on the base 1, a limiting cylinder 3 clamped between the two clamping structures 2, a blow molding tube 4 slidably connected in the limiting cylinder 3, a multi-stage cylinder 5 fixedly installed on the base 1, and the bottom of the blow molding tube 4 fixedly connected to the output end of the multi-stage cylinder 5, and a connector 41 fixedly installed near the bottom end of the blow molding tube 4; a rotating nozzle 6 rotatably connected to the upper end of the blow molding tube 4, a plurality of annularly distributed lateral air jets 61 on the rotating nozzle 6, and the lateral air jets 61 are inclined upward from the inside to the outside; a plurality of annularly distributed blades 62 are fixedly installed inside the rotating nozzle 6.

[0027] It should be noted that: the blow molding tube 4 in this utility model is used for high-pressure blow molding in a blow molding machine to transport high-pressure air. The rotating nozzle 6 at its upper end replaces the air blowing head in a traditional blow molding machine. The connector 41 is used for connecting the high-pressure air circuit system in the blow molding machine. The mounting hole 11 on the base 1 is used to fix the base 1 to the ground with bolts. The two clamping structures 2 clamp and fix the limiting cylinder 3. In actual application, thermoplastic raw materials are heated and melted, and a preliminary tubular or preform structure is formed by extrusion or injection. Then, the preform is placed in the split mold while hot (or heated to a softened state). After the mold is closed, the external air circuit system introduces external high-pressure air into the blow molding tube 4 through the connector 41, which impacts the annularly distributed blades 62 inside the rotating nozzle 6. Because the blades 62 are designed with a specific angle of inclination, the high-pressure airflow generates circumferential thrust on the blades 62, driving the rotating nozzle 6 to rotate at high speed around the upper end of the blow molding tube 4, realizing self-driven rotation of the airflow without the need for an additional motor drive, simplifying the structure and reducing energy consumption. While the rotating nozzle 6 is rotating... The high-pressure airflow is divided into two paths acting on the preform. First, the side-mounted jet nozzles 61 spray air laterally. The annularly distributed side-mounted jet nozzles 61 on the rotating nozzle 6 create a 360° annular airflow due to the nozzle's rotation, and the jet direction is inclined upwards from the inside out. This can specifically inflate the transition area between the preform's sidewall and the barrel opening, avoiding the uneven sidewall stress and wall thickness deviation problems caused by traditional vertical jetting. Second, the upper end of the rotating nozzle 6 sprays air, with some airflow directly ejected from the upper opening of the rotating nozzle 6, focusing on the top of the preform (corresponding to the plastic barrel). The bottom of the barrel is fully expanded to conform to the bottom contour of the mold, preventing dents or air bubbles. In the high-pressure blow molding process of the plastic barrel, the self-rotating rotary nozzle 6 and the multi-stage cylinder 5 control its gradual rise, inflating the plastic barrel layer by layer to avoid insufficient pressure on the barrel body. The side air nozzles 61 on the rotary nozzle 6 spray the plastic barrel laterally, avoiding the uneven force on the side wall and wall thickness deviation caused by traditional vertical air spraying. The upper air spraying prevents the bottom of the barrel from sinking, thus improving the blow molding quality of the plastic barrel.

[0028] The upper end of the blow molding tube 4 is provided with an annular groove 42, and an annular rotating block 63, which is fixedly connected to the lower end of the rotating nozzle 6, is rotatably connected in the annular groove 42. The annular groove 42 and the annular rotating block 63 form a matching annular mating structure, which can form a full circumferential constraint on the rotating nozzle 6, effectively limiting its radial sway or displacement during high-speed rotation, and ensuring that the rotating nozzle 6 always rotates stably around the axis of the blow molding tube 4.

[0029] Furthermore, an annular groove 43 is provided on the inner wall of the annular groove 42, and multiple balls 44 are rolled in the annular groove 43; the balls 44 roll in the annular groove 43, converting part of the sliding friction between the blow molding tube 4 and the rotating nozzle 6 into rolling friction, reducing the friction between the two, which is beneficial to the rotation of the rotating nozzle 6.

[0030] Among them, the maximum outer diameter of the rotating nozzle 6 is smaller than the outer diameter of the blow molding tube 4; after the plastic bucket is blow molded, the blow molding tube 4 needs to be lowered and separated from the molded plastic bucket to form the mouth of the plastic bucket. The rotating nozzle 6, which is smaller than the blow molding tube 4, can be smoothly separated from the plastic bucket, avoiding damage to the plastic bucket caused by the rotating nozzle 6.

[0031] It is worth noting that:

[0032] In the embodiments of this utility model, please refer to Figure 1 and Figure 2 Two clamping structures 2 are symmetrically distributed. Each clamping structure 2 includes a support plate 21 that is vertically fixed on the base 1. A clamping cylinder 22 is fixedly installed on the upper end of the support plate 21. A clamping piston rod 23 is fixedly installed at the output end of the clamping cylinder 22. An arc-shaped clamping plate 24 is fixedly installed at the end of the clamping piston rod 23 away from the clamping cylinder 22. The limiting cylinder 3 is clamped and fixed by the two symmetrically distributed arc-shaped clamping plates 24.

[0033] It should be noted that: the clamping cylinder 22 controls the extension and retraction of the clamping piston rod 23, and the clamping cylinder 22 in the two clamping structures 2 controls the two arc-shaped clamping plates 24 to move closer or separate synchronously. The clamping cylinder 22 drives the traditional manual bolt fixing instead of the traditional manual bolt fixing. Only the air circuit switch needs to be controlled to complete the quick clamping or loosening of the limit cylinder. There is no need to manually tighten the bolts one by one, which greatly shortens the loading and unloading time of the limit cylinder 3, improves the production preparation efficiency, and facilitates the replacement of the blow molding tube 4 and the corresponding limit cylinder 3 as needed.

[0034] It is worth noting that: both concave arc surfaces of the two arc-shaped clamping plates 24 are fixedly equipped with arc-shaped gaskets 241; the surface friction coefficient of the elastic material arc-shaped gaskets 241 is much higher than that of the metal clamping plates, and can generate greater static friction when in contact with the outer wall of the limiting cylinder 3. Under the dynamic working conditions of high-speed lifting and lowering of the blow molding tube 4 and airflow impact of the rotating nozzle 6, it can effectively prevent the limiting cylinder 3 from "slipping" due to vibration or radial force, ensuring that the limiting cylinder 3 always maintains a stable center position, and providing precise guidance for the vertical lifting and lowering of the blow molding tube 4.

[0035] Furthermore, a horizontally arranged sleeve 26 is fixedly installed on the support plate 21, and the sleeve 26 penetrates the support plate 21. An L-shaped support rod 27 is fixedly installed at the lower end of the arc-shaped clamping plate 24, and one end of the L-shaped support rod 27 away from the sleeve 26 is inserted into the sleeve 26 and slidably connected to it. One end of the L-shaped support rod 27 is fixed to the lower end of the arc-shaped clamping plate 24, and the other end is slidably inserted into the sleeve 26, providing additional support force to the arc-shaped clamping plate 24 and providing stable radial constraint force to the arc-shaped clamping plate 24, preventing it from tilting or shaking due to uneven force during clamping and loosening, and ensuring that the moving direction of the arc-shaped clamping plate 24 always remains perpendicular to the axis of the limiting cylinder 3.

[0036] Furthermore, a connecting frame 25 is fixedly installed between the two support plates 21 located on the two clamping structures 2; the two symmetrical support plates 21 are rigidly connected by the connecting frame 25 to improve the stability of the device and avoid clamping offset caused by the tilt of the support plates 21.

[0037] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A blow molding apparatus for plastic buckets, comprising a base (1), wherein the base (1) has mounting holes (11), characterized in that: Two symmetrically distributed clamping structures (2) are installed on the base (1), and a limiting cylinder (3) is clamped between the two clamping structures (2). A blow molding tube (4) is slidably connected in the limiting cylinder (3). A multi-stage cylinder (5) is fixedly installed on the base (1), and the bottom of the blow molding tube (4) is fixedly connected to the output end of the multi-stage cylinder (5). A connector (41) is fixedly installed near the bottom end of the blow molding tube (4). The upper end of the blow molding tube (4) is rotatably connected to a rotating nozzle (6). The rotating nozzle (6) has multiple lateral air jets (61) arranged in a ring, and the lateral air jets (61) are arranged inclined upward from the inside to the outside. Multiple blades (62) are fixedly installed inside the rotating nozzle (6).

2. The plastic bucket blow molding apparatus according to claim 1, characterized in that, The two clamping structures (2) are symmetrically distributed. Each clamping structure (2) includes a support plate (21) that is vertically fixed on the base (1). A clamping cylinder (22) is fixedly installed on the upper end of the support plate (21). A clamping piston rod (23) is fixedly installed at the output end of the clamping cylinder (22). An arc-shaped clamping plate (24) is fixedly installed at the end of the clamping piston rod (23) away from the clamping cylinder (22). The limiting cylinder (3) is clamped and fixed by the two symmetrically distributed arc-shaped clamping plates (24).

3. The plastic bucket blow molding apparatus according to claim 2, characterized in that, Both of the arc-shaped clamps (24) have arc-shaped gaskets (241) fixedly installed on their concave arc surfaces.

4. The plastic bucket blow molding apparatus according to claim 2, characterized in that, A horizontally arranged sleeve (26) is fixedly installed on the support plate (21), and the sleeve (26) is arranged through the support plate (21). An L-shaped support rod (27) is fixedly installed at the lower end of the arc-shaped clamp (24), and the end of the L-shaped support rod (27) away from the sleeve (26) is inserted into the sleeve (26) and slidably connected to it.

5. The plastic bucket blow molding apparatus according to claim 2, characterized in that, A connecting frame (25) is fixedly installed between two support plates (21) located on the two clamping structures (2).

6. The plastic bucket blow molding apparatus according to claim 1, characterized in that, The upper end of the blow molding tube (4) is provided with an annular groove (42), and an annular rotating block (63) is rotatably connected in the annular groove (42) and fixedly connected to the lower end of the rotating nozzle (6).

7. The plastic bucket blow molding apparatus according to claim 6, characterized in that, An annular groove (43) is provided on the inner wall of the annular groove (42), and a plurality of balls (44) are rolled in the annular groove (43).

8. The plastic bucket blow molding apparatus according to claim 1, characterized in that, The maximum outer diameter of the rotating nozzle (6) is smaller than the outer diameter of the blow molding tube (4).

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