Heat preservation mechanism of high-molecular polylactic acid solid extrusion molding machine

Abstract

The utility model discloses a heat preservation mechanism of a polymer polylactic acid solid extrusion molding machine, which comprises two heat preservation assemblies for preserving heat of a molded polylactic acid product, a distance adjusting mechanism and a lifting mechanism, and the two heat preservation assemblies are respectively and fixedly arranged at two ends of the distance adjusting mechanism. By means of the heating blocks and the hot air blowing mode, products are heated more evenly, the heat preservation effect is effectively improved, the quality of polylactic acid products is guaranteed, the distance between the two heating blocks can be adjusted through the distance adjusting mechanism so that the heat preservation requirements of polylactic acid products of different sizes can be met, the universality of equipment is improved, and the production cost is reduced. The heating assembly can be conveniently lifted by the lifting mechanism, an operation space is provided for the slitting device, interference of the heat preservation mechanism on operation in the slitting process is avoided, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of polylactic acid solid extrusion molding machines, and particularly to the heat preservation mechanism of polylactic acid solid extrusion molding machines. Background Technology

[0002] Polylactic acid (PLA) is a bio-based polymer material produced through microbial fermentation and chemical synthesis. It is biodegradable and has good biocompatibility, and is widely used in packaging, textiles, medical, 3D printing and industrial products.

[0003] Polylactic acid (PLA), as a biodegradable and environmentally friendly polymer, suffers from inherent defects in products manufactured using traditional injection molding processes, such as low density and insufficient burst strength, making it difficult to meet the stringent mechanical property requirements of high-end fields like medical devices. Solid-state extrusion molding technology, through secondary densification of the injection preform, can significantly improve the material's density and crack resistance. However, a significant temperature gradient exists at the die exit point after molding, leading to residual stress concentration during cooling, causing surface microcracks and internal structural defects, resulting in a low yield rate. Utility Model Content

[0004] The purpose of this invention is to provide a heat preservation mechanism for a polylactic acid solid extrusion molding machine to solve the technical defects of large temperature gradient and low yield of products after extrusion.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The heat preservation mechanism of the polylactic acid solid extrusion molding machine includes heat preservation components for heat preservation of the molded polylactic acid product. The heat preservation components are two sets arranged opposite each other. Each heat preservation component includes a heating block. The heating block is concave on the inner side and is arc-shaped. The side of the heating block has a mounting hole and an electric heating rod is installed in the mounting hole. The outer end face of the heating block has an air inlet channel. The arc-shaped surface of the heating block has an air outlet hole, which is connected to the air inlet channel.

[0007] As a further embodiment of this utility model, it also includes a spacing adjustment mechanism and a lifting mechanism. Two sets of heat preservation components are respectively fixedly installed at both ends of the spacing adjustment mechanism, and the spacing adjustment mechanism is installed at the movable end of the lifting mechanism.

[0008] As a further embodiment of this utility model, the spacing adjustment mechanism includes an opening and closing air gripper, and connecting plates are fixedly provided on the piston rods at both ends of the opening and closing air gripper, with a heating block fixedly mounted on the connecting plates.

[0009] As a further embodiment of this utility model, the lifting mechanism includes a cylinder and a mounting base. The cylinder is fixedly mounted on the mounting base, and a fixed base is detachably provided at the lower end of the piston rod of the cylinder. The opening and closing gripper is fixedly mounted at the bottom of the fixed base.

[0010] As a further embodiment of this utility model, the top of the fixed base is provided with an assembly groove, and the bottom of the piston rod of the cylinder is fixedly connected to a floating head, which is engaged in the assembly groove.

[0011] As a further embodiment of this utility model, it also includes a slider and a slide rail. The slide rail is fixedly mounted on the mold frame of the polylactic acid solid extrusion molding machine, and the slider is fixedly mounted on the fixed base. The slider is slidably mounted on the slide rail.

[0012] Compared with existing technologies, the heat preservation mechanism of the polylactic acid solid extrusion molding machine provided by this utility model has the following beneficial effects:

[0013] This invention utilizes a heating block and hot air blowing method to ensure more uniform heating of the product during extrusion, effectively improving the heat preservation effect and slowing down the temperature change after extrusion, thus guaranteeing the quality of polylactic acid (PLA) products. The spacing adjustment mechanism can adjust the distance between the two heating blocks to adapt to the heat preservation requirements of PLA products of different sizes, improving the versatility of the equipment. The lifting mechanism can easily raise the heating components, providing operating space for the slitting device, avoiding interference from the heat preservation mechanism during the slitting process, and improving production efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0016] Figure 2 for Figure 1 A magnified structural diagram of part A in the diagram;

[0017] Figure 3 This is a schematic diagram of the heating block in an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0019] Figure 5This is a schematic diagram of the structure of the present invention installed on a polylactic acid solid extrusion molding machine.

[0020] Figure label:

[0021] 1. Heating block; 101. Mounting hole; 102. Air inlet channel; 103. Air outlet; 2. Electric heating rod; 3. Opening and closing gripper; 4. Connecting plate; 5. Cylinder; 501. Mounting base; 502. Floating head; 6. Fixed base; 601. Assembly slot; 7. Slider; 8. Slide rail. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0025] See Figures 1 to 5 As shown, the heat preservation mechanism of the polylactic acid solid extrusion molding machine of this utility model includes a heat preservation component for heat preservation of the molded polylactic acid product, a spacing adjustment mechanism and a lifting mechanism. The heat preservation component consists of two sets arranged opposite to each other. The two sets of heat preservation components are respectively fixedly installed at both ends of the spacing adjustment mechanism, and the spacing adjustment mechanism is installed at the movable end of the lifting mechanism.

[0026] The insulation components keep the molded polylactic acid (PLA) products warm, preventing excessive heat loss that could affect quality. The spacing adjustment mechanism allows for adjustment of the distance between the two sets of insulation components to accommodate PLA products of different sizes. The lifting mechanism can raise or lower the spacing adjustment mechanism and insulation components as a whole to meet the needs of different working scenarios; during slitting operations, the insulation components can be raised.

[0027] See Figure 1 As shown in the embodiment of this utility model, both sets of heat preservation components include a heating block 1. The inner side of the heating block 1 is concave and arc-shaped. A mounting hole 101 is provided on the side of the heating block 1, and an electric heating rod 2 is fixedly installed in the mounting hole 101. When the electric heating rod 2 is energized, it generates heat, which is transferred to the heating block 1, causing the temperature of the heating block 1 to rise. The concave arc-shaped heating block 1 can better conform to the shape of the polylactic acid product, thereby more effectively heating and preserving the product.

[0028] The heating block 1 in this embodiment of the present invention is made of brass.

[0029] See Figure 3 As shown, an air inlet channel 102 is provided on the outer end face of the heating block 1, and an air outlet 103 is provided on the arc-shaped surface of the heating block 1. The air outlet 103 is connected to the air inlet channel 102. Compressed air is introduced into the air inlet channel 102. The compressed air is heated into hot air when passing through the heating block 1, and blown onto the polylactic acid product through the air outlet 103 to further improve the heat preservation effect of the product and make the product heated more evenly.

[0030] See Figure 1 As shown, in this embodiment of the utility model, the spacing adjustment mechanism includes an opening and closing air gripper 3. A connecting plate 4 is fixedly installed on the piston rods at both ends of the opening and closing air gripper 3, and the heating block 1 is fixedly installed on the connecting plate 4.

[0031] By controlling the extension and retraction of the piston rod of the opening and closing gripper 3, the piston rod drives the connecting plate 4 to move. Since the heating block 1 is fixed on the connecting plate 4, the distance between the two heating blocks 1 will change accordingly. It can be adjusted according to the different sizes of polylactic acid products to ensure that the heating block 1 can maintain a specific distance from the product and ensure the heat preservation effect.

[0032] See Figure 1 , 2 As shown, the lifting mechanism includes a cylinder 5 and a mounting base 501. The cylinder 5 is fixedly mounted on the mounting base 501. A fixed base 6 is detachably mounted on the lower end of the piston rod of the cylinder 5. The opening and closing gripper 3 is fixedly mounted on the bottom of the fixed base 6.

[0033] In use, the piston rod of the control cylinder 5 extends and retracts, causing the fixed base 6 to move up and down. Since the opening and closing gripper 3 is fixed to the bottom of the fixed base 6, and the heat insulation component is mounted on the opening and closing gripper 3, the overall lifting and lowering of the heat insulation component can be achieved. When polylactic acid products need to be cut, the piston rod of the cylinder 5 is extended, causing the heating component to move upward, providing operating space for the cutting device.

[0034] See Figure 2 As shown, the top of the fixed base 6 is provided with an assembly groove 601, and the bottom of the piston rod of the cylinder 5 is fixedly connected with a floating head 502, which is snapped into the assembly groove 601.

[0035] By snapping the floating head 502 into the assembly slot 601, the snapping method allows the floating head 502 to float and deviate, compensating for errors during installation and movement, making the connection between the cylinder 5 and the fixed seat 6 more flexible, reducing damage to the equipment caused by inaccurate installation or minor deviations during movement, and ensuring the normal operation of the equipment.

[0036] See Figure 4 As shown, this embodiment of the invention also includes a slider 7 and a slide rail 8. The slide rail 8 is fixedly installed on the mold frame of the polylactic acid solid extrusion molding machine, and the slider 7 is fixed on the fixed base 6. The slider 7 is slidably installed on the slide rail 8. The slider 7 and the slide rail 8 form a sliding pair, which makes the lifting and lowering of the heat preservation component more stable and accurate, and avoids shaking or deviation.

[0037] During the operation of the polylactic acid (PLA) solid extrusion molding machine, the PLA product needs to be kept warm after molding. Based on the product size, the piston rod of the opening and closing gripper 3 is controlled to extend and retract, and the distance between the two heating blocks 1 is adjusted via the connecting plate 4. The electric heating rod 2 is energized to heat the heating blocks 1, while compressed air is simultaneously introduced into the air inlet channel 102. The compressed air is heated into hot air within the heating blocks 1 and blown onto the product through the air outlet 103, thus keeping the product warm. When a product slitting operation is required, the piston rod of the control cylinder 5 extends. The piston rod drives the fixed seat 6 to rise via the floating head 502 and the assembly groove 601. The slider 7 on the fixed seat 6 slides on the slide rail 8, ensuring a smooth rising process, thereby moving the entire heating assembly upwards and providing operating space for the slitting device.

[0038] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. The heat preservation mechanism of a polylactic acid solid extrusion molding machine, characterized in that: The application relates to a heat preservation assembly for heat preservation of a shaped polylactic acid product, which comprises two sets of heat preservation assemblies arranged oppositely, each of the heat preservation assemblies comprises a heating block (1) which is concave and arc-shaped on the inner side, a mounting hole (101) is formed in the side surface of the heating block (1), an electric heating rod (2) is arranged in the mounting hole (101), an air inlet channel (102) is formed in the outer end surface of the heating block (1), and an air outlet hole (103) is formed in the arc surface of the heating block (1) and is communicated with the air inlet channel (102).

2. The heat retaining mechanism of the high polymer polylactic acid solid state extrusion molding machine according to claim 1, characterized in that: The heat preservation assembly further comprises a distance adjusting mechanism and a lifting mechanism, the two sets of heat preservation assemblies are fixedly arranged at the two ends of the distance adjusting mechanism respectively, and the distance adjusting mechanism is arranged at the movable end of the lifting mechanism.

3. The heat retaining mechanism of the high polymer polylactic acid solid state extrusion molding machine according to claim 2, characterized in that: The distance adjusting mechanism comprises an opening and closing air claw (3), connecting plates (4) are fixedly arranged on the piston rods at the two ends of the opening and closing air claw (3), and the heating block (1) is fixedly arranged on the connecting plate (4).

4. The heat retaining mechanism of the high polymer polylactic acid solid state extrusion molding machine according to claim 3, characterized in that: The lifting mechanism comprises a gas cylinder (5) and a mounting base (501), the gas cylinder (5) is fixedly arranged on the mounting base (501), a fixing base (6) is detachably arranged at the lower end of the piston rod of the gas cylinder (5), and the opening and closing air claw (3) is fixedly arranged at the bottom of the fixing base (6).

5. The heat retaining mechanism of the high polymer polylactic acid solid state extrusion molding machine according to claim 4, characterized in that: A mounting groove (601) is formed in the top of the fixing base (6), a floating head (502) is fixedly connected to the bottom of the piston rod of the gas cylinder (5), and the floating head (502) is clamped in the mounting groove (601).

6. The heat retaining mechanism of the high polymer polylactic acid solid state extrusion molding machine according to claim 4 or 5, characterized in that: The heat preservation assembly further comprises a sliding block (7) and a sliding rail (8), the sliding rail (8) is fixedly arranged on a die frame of a high-molecular polylactic acid solid extrusion forming machine, the sliding block (7) is fixedly arranged on the fixing base (6), and the sliding block (7) is slidingly arranged on the sliding rail (8).

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