Degradable plastic blow molding machine bubble stabilizing frame

Abstract

This utility model discloses a biodegradable plastic blow molding machine bubble stabilizing frame, comprising: a support frame including two annular support rings arranged parallel to each other; a vertical support, with several vertical supports arranged in an array along the circumferential direction between the support frame; and a layered variable-diameter regular polygonal bubble stabilizing mechanism disposed on the vertical supports, comprising: a first sprocket rotatably mounted on each of the vertical supports; a rotating sleeve coaxially disposed with the vertical supports and fixedly connected to the first sprocket; and a bubble stabilizing crossbar assembly horizontally disposed on the side wall of the rotating sleeve. The layered variable-diameter regular polygonal bubble stabilizing mechanism comprises a multi-layer structure, with adjacent layers positioned by a partition sleeve; each layer of the regular polygonal bubble stabilizing mechanism is equipped with an independent variable-diameter driver. This utility model uses a variable-diameter driver to individually drive each layer of the variable-diameter regular polygonal bubble stabilizing mechanism to change its diameter, achieving asynchronous diameter adjustment and eliminating the defects of gap / overpressure in the conical membrane support caused by traditional synchronous adjustment.

Description

Technical Field

[0001] This utility model belongs to the technical field of bubble stabilization equipment for blow molding machines, specifically relating to a biodegradable plastic bubble stabilization rack for blow molding machines. Background Technology

[0002] The bubble stabilizer is a key component in film blow molding equipment. Its function is to stabilize the shape of the cylindrical film bubble extruded from the die, preventing the bubble from swaying, wrinkling, or even breaking due to airflow disturbance or uneven cooling. Bubble stabilization is especially important for the production of biodegradable plastic films—the melt strength of biodegradable materials (such as PLA / PBAT) is usually lower than that of traditional polyethylene, making the film bubble more prone to collapse and deformation in the cooling section, directly affecting the film thickness uniformity and yield.

[0003] In the prior art, patent CN201820852046.X discloses a typical bubble stabilizer structure, which consists of a base, rotating columns, and stabilizing crossbars. A chain gear mechanism drives the rotating columns in a ring array to rotate synchronously, causing the stabilizing crossbars to enclose and form a scalable regular polygonal frame. While this solution can meet the bubble stabilization requirements of cylindrical membrane bubbles, it has the following drawbacks:

[0004] When producing tapered membranes, such as garbage bags and agricultural mulch films, which require gradually changing diameters, all rotating columns are forced to rotate synchronously. This causes the regular polygons formed by the crossbars in each layer to scale proportionally. This forces the membrane bubble to passively adapt to the rigid frame rather than the frame fitting the membrane bubble, resulting in localized compression or support gaps in the tapered transition zone, causing scratches or vibrations on the membrane surface. Utility Model Content

[0005] In order to overcome the problems existing in the background art, the present invention provides a biodegradable plastic blow molding machine bubble stabilizer.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a biodegradable plastic blow molding machine bubble stabilizer, comprising:

[0007] The support frame includes two annular support rings arranged parallel to each other at the top and bottom.

[0008] Vertical supports, several of which are arranged in an array along the circumferential direction between the support frames;

[0009] A layered, variable-diameter, regular polygonal bubble-stabilizing mechanism, mounted on the vertical support, includes:

[0010] The first sprocket is rotatably mounted on each of the vertical supports;

[0011] A rotating sleeve is coaxially arranged with the vertical support and fixedly connected to the first sprocket;

[0012] A bubble-stabilizing crossbar assembly is horizontally disposed on the side wall of the rotating sleeve;

[0013] The layered variable diameter regular polygonal bubble stabilizing mechanism comprises a multi-layered structure, with adjacent layers positioned by a separating sleeve.

[0014] Each layer of the regular polygonal bubble-stabilizing mechanism is equipped with an independent variable-diameter driver, which drives all the bubble-stabilizing crossbar assemblies in the same layer.

[0015] Rotating in the same direction to achieve radial extension and retraction of the variable diameter regular polygonal bubble stabilizing mechanism.

[0016] Preferably, the variable diameter drive includes:

[0017] A drive shaft, rotatably connected to the support frame at both ends;

[0018] The second sprocket is fixed on the drive shaft and is coplanar with the first sprocket in the same layer;

[0019] A drive chain meshes with the second sprocket and all the first sprockets in the same layer;

[0020] The power unit drives the drive shaft to rotate controllably.

[0021] Preferably, the power unit includes:

[0022] The geared motor is mounted on the support frame;

[0023] An encoder is mounted on the output shaft of the geared motor;

[0024] The output shaft is connected to the drive shaft via a coupling.

[0025] Preferably, the bubble stabilizing crossbar assembly includes:

[0026] A mandrel is horizontally fixed to the side wall of the rotating sleeve;

[0027] A contact sleeve that can be rotatably sleeved on the mandrel;

[0028] The surface of the contact sleeve is coated with a nano-ceramic coating.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] This invention uses a variable diameter driver to individually drive the variable diameter regular polygonal bubble stabilizing mechanism of each layer to change the diameter, thereby achieving asynchronous diameter adjustment and eliminating the defects of voids / overpressure in the support of the conical membrane caused by traditional synchronous adjustment. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a bubble stabilizer for a biodegradable plastic blow molding machine;

[0032] Figure 2This is a schematic diagram of a variable-diameter regular polygonal bubble stabilizing mechanism;

[0033] Figure 3 This is a structural schematic diagram of the bubble stabilizing crossbar assembly;

[0034] Figure 4 This is a cross-sectional structural diagram of the bubble stabilizer crossbar assembly.

[0035] In the diagram: 1. Support frame; 2. Vertical bracket; 3. First sprocket; 4. Rotating sleeve; 5. Bubble stabilizing crossbar assembly; 6. Separating sleeve; 7. Drive shaft; 8. Second sprocket; 9. Transmission chain; 10. Gear motor; 11. Encoder; 12. Mandrel; 13. Contact sleeve; 14. First bearing; 15. Third bearing. Detailed Implementation

[0036] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below to facilitate understanding by those skilled in the art.

[0037] Please see Figures 1 to 4 This embodiment provides a biodegradable plastic blow molding machine bubble stabilizer, comprising:

[0038] The support frame 1 includes two annular support rings arranged parallel to each other at the top and bottom; the support frame 1 is connected to the blow molding machine.

[0039] Vertical supports 2, several of which are arranged in an array along the circumferential direction between the support frames 1; in this embodiment, 6 supports are used.

[0040] A layered, variable-diameter, regular polygonal bubble-stabilizing mechanism, mounted on the vertical support 2, includes:

[0041] The first sprocket 3 is rotatably mounted on each of the vertical supports 2;

[0042] The rotating sleeve 4 is coaxially arranged with the vertical support 2 and fixedly connected to the first sprocket 3; the first sprocket 3 and the rotating sleeve 4 are provided with a first bearing 14 connected to the cylindrical vertical support 2.

[0043] The bubble stabilizing crossbar assembly 5 is horizontally disposed on the side wall of the rotating sleeve 4;

[0044] The layered variable diameter regular polygonal bubble stabilizing mechanism comprises a multi-layered structure, with adjacent layers positioned by a separating sleeve 6.

[0045] Each layer of the regular polygonal bubble stabilizing mechanism is equipped with an independent variable diameter actuator, driving all the bubble stabilizing crossbar assemblies 5 in the same layer.

[0046] Rotation in the same direction enables radial expansion and contraction of the variable-diameter regular polygonal bubble stabilizing mechanism. This embodiment uses a 5-layer variable-diameter regular polygonal bubble stabilizing mechanism.

[0047] The variable diameter drive includes:

[0048] The drive shaft 7 is rotatably connected to the support frame 1 at both ends, and the two ends of the drive shaft 7 are connected to the support frame 1 through the second bearing; there are 5 drive shafts 7, corresponding to 5 levels.

[0049] The second sprocket 8 is fixed on the drive shaft 7 and is coplanar with the first sprocket 3 in the same layer;

[0050] The drive chain 9 meshes with the second sprocket 8 and all the first sprockets 3 in the same layer;

[0051] The power unit drives the drive shaft 7 to rotate controllably, thereby realizing the variable diameter of the variable diameter regular polygonal bubble stabilizing mechanism.

[0052] The power unit includes:

[0053] The geared motor 10 is mounted on the support frame 1;

[0054] An encoder 11 is installed on the output shaft of the geared motor 10; the encoder 11 is an absolute encoder 11, which records the initial angle of the rotating sleeve 4 and calculates the radial displacement of the crossbar in real time.

[0055] The output shaft is connected to the drive shaft 7 via a coupling;

[0056] In this embodiment, a PLC controller is used, which achieves precise control of each geared motor 10 through a cone-angle-diameter mapping algorithm.

[0057] The diameter of the bubble is fed back by a laser rangefinder, the PID control of the geared motor 10 compensates for the rotation angle, the PLC sets the initial cone angle, the geared motor 10 drives the transmission chain 9, the first sprocket 3 drives the rotating sleeve 4 to deflect, so that the bubble stabilizing crossbar group is radially displaced to the target position.

[0058] The bubble stabilizing crossbar assembly 5 includes:

[0059] The mandrel 12 is horizontally fixed to the side wall of the rotating sleeve 4;

[0060] A contact sleeve 13 that can be rotatably sleeved on the mandrel 12;

[0061] The surface of the contact sleeve 13 is coated with a nano-ceramic coating.

[0062] A third bearing 15 is provided between the contact sleeve 13 and the mandrel 12.

[0063] When using the biodegradable plastic blow molding machine bubble stabilizer of this utility model:

[0064] 1. Input the bubble parameters via PLC: die diameter D0, cone angle θ, and total bubble height H;

[0065] 2. The PLC calculates the target diameter for each layer;

[0066] Bottom layer: D1 = D0 + k·H1·tanθ

[0067] Second layer: D2=D0+k·H2·tanθ

[0068] Three layers: D3=D0+k·H3·tanθ

[0069] Fourth layer: D4 = D0 + k·H4·tanθ

[0070] Top layer: D5 = D0 + k·H5·tanθ

[0071] 3. Layered variable diameter drive;

[0072] 4. Dynamic compensation control

[0073] When the traction speed increases: detect the speed increment Δv, calculate the top layer compensation amount: ΔD=0.025×Δv×H5, where 0.025 is an engineering constant determined by the experiment on the shrinkage characteristics of plastic; drive the top layer crossbar to expand again by ΔD;

[0074] When the membrane bubble vibration exceeds the standard: the laser rangefinder detects a diameter fluctuation > ±5mm, the PID outputs a compensation pulse, and the motor fine-tunes the rotation angle (within ±0.5°).

[0075] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A biodegradable plastic blow molding machine bubble stabilizer, characterized in that, include: The support frame (1) includes two annular support rings arranged parallel to each other at the top and bottom; the vertical support (2) consists of several supports arranged in an array along the circumferential direction between the support frame (1); A layered variable diameter regular polygonal bubble stabilizing mechanism is provided on the vertical support (2) and includes: a first sprocket (3) rotatably mounted on each of the vertical supports (2); A rotating sleeve (4) is coaxially arranged with the vertical support (2) and fixedly connected to the first sprocket (3); a bubble stabilizing crossbar assembly (5) is horizontally arranged on the side wall of the rotating sleeve (4); the layered variable diameter regular polygon bubble stabilizing mechanism includes a multi-layer structure, with adjacent layers positioned by a separating sleeve (6); each layer of the regular polygon bubble stabilizing mechanism is equipped with an independent variable diameter driver, which drives all the bubble stabilizing crossbar assemblies (5) in the same layer to rotate synchronously and in the same direction to achieve radial extension and retraction of the variable diameter regular polygon bubble stabilizing mechanism.

2. The bubble stabilizer according to claim 1, characterized in that, The variable diameter drive includes: a drive shaft (7) rotatably connected to the support frame (1) at both ends; a second sprocket (8) fixed on the drive shaft (7) and coplanar with the first sprocket (3) in the same layer; a transmission chain (9) meshing with the second sprocket (8) and all the first sprockets (3) in the same layer; and a power unit that drives the drive shaft (7) to rotate controllably.

3. The bubble stabilizer according to claim 2, characterized in that, The power unit includes: a geared motor (10) mounted on the support frame (1); an encoder (11) disposed on the output shaft of the geared motor (10); and the output shaft is connected to the drive shaft (7) via a coupling.

4. The bubble stabilizer according to claim 3, characterized in that, The bubble stabilizing crossbar assembly (5) includes: a mandrel (12) horizontally fixed to the side wall of the rotating sleeve (4); a contact sleeve (13) rotatably sleeved on the mandrel (12); and the surface of the contact sleeve (13) is covered with a nano-ceramic coating.

Images