CN113954396A

CN113954396A - PLA biodegradable straw crystallization furnace

Info

Publication number: CN113954396A
Application number: CN202111334309.0A
Authority: CN
Inventors: 凌红军
Original assignee: Nanjing Marrow Machinery Manufacturing Co ltd
Current assignee: Nanjing Marrow Machinery Manufacturing Co ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-01-21

Abstract

The invention provides a PLA biodegradable straw crystallizing furnace, which comprises a PLA straw conveying mechanism, a preheating area and a constant temperature area, wherein the PLA straw conveying mechanism enables a PLA straw to be crystallized to sequentially pass through the preheating area and the constant temperature area, the preheating area and the constant temperature area are both provided with heating assemblies, the heating assemblies are arranged at the bottom of a conveying belt, and the preheating area and the constant temperature area are respectively provided with a first air return pipeline and a second air return pipeline. According to the invention, the heating assembly is arranged at the bottom of the conveying belt for heating, hot air convection is fully utilized, the heating temperature in the crystallization furnace is kept stable and uniform, the preheating zone is arranged for preheating the PLA suction pipe, defective products caused by sudden contact of the PLA suction pipe with high temperature are avoided, the defective rate is reduced, the arrangement of the air return pipeline I and the air return pipeline II forms a hot air internal circulation backflow channel, high-efficiency hot air convection and heat effect are formed, the working efficiency of the crystallization furnace is greatly improved, and the energy consumption is reduced.

Description

PLA biodegradable straw crystallization furnace

Technical Field

The invention relates to the field of straw production, in particular to a crystallization furnace for a PLA biodegradable straw.

Background

The PLA biodegradable straw is made of a novel bio-based and renewable biodegradable material called PLA, also called polylactic acid. It is made up by using starch raw material provided by renewable plant resource (for example corn and cassava), and can be degraded. While ordinary plastic straws are not degradable. The PLA polylactic acid straw takes starch as a main raw material, and the starch is biodegradable natural polymer which can be decomposed into water and carbon dioxide in compost for 180 days after being discarded, so that the PLA polylactic acid straw does not pollute the environment; and the common plastic straw can not be automatically degraded after being used and discarded, and has certain pollution to the environment. The appearance and performance of the PLA degradable straw are close to those of the traditional straw product made of polypropylene, the product has good glossiness, and has the advantages of safety, sanitation, environmental protection and biodegradability, and the quality guarantee period can reach 12 months.

At present, the PLA straw can increase the step of secondary crystallization when producing, in order to reach and to reduce cost, improve the temperature resistant purpose of PLA straw, generally use the oven to heat during the PLA straw secondary crystallization, traditional oven adopts limited high-power U type heating pipe or far infrared heating pipe of quantity, and arrange in the top of oven, the conveyer belt is located the bottom of heating copper pipe, blow hot-blast to the belt of below through the fan, the temperature is not enough even, the temperature fluctuation is big, the difference in temperature can reach 30-50 ℃ with the bottom, the temperature is not stable enough, just cause local temperature too high, or local temperature is not enough, lead to PLA straw crystallization inadequately, the straw is crooked obvious, and the power consumption is big, it is inhomogeneous to heat.

Disclosure of Invention

The invention aims to provide an efficient and energy-saving PLA biodegradable straw crystallizing furnace which has the advantages of uniform and stable temperature in the furnace, small local temperature difference and high efficiency.

In order to achieve the above purpose, the invention provides the following technical scheme: the utility model provides a PLA straw crystallization furnace, includes PLA straw transport mechanism, still includes preheating zone and thermostatic zone, and PLA straw transport mechanism will treat the PLA straw of crystallization and loop through preheating zone and thermostatic zone, preheating zone and thermostatic zone all are provided with heating element, heating element sets up the bottom at the conveyer belt, preheating zone and thermostatic zone are provided with return air pipeline one and return air pipeline two respectively, return air pipeline both ends communicate with the air outlet and the air intake of preheating zone respectively, return air pipeline two both ends communicate with the air outlet and the air intake of thermostatic zone respectively, preheating zone and thermostatic zone all are provided with the fan, and formation hot air inner loop convection is in order to keep the controllable invariant of heating temperature in preheating zone and the thermostatic zone.

Furthermore, the air conditioner further comprises a rack, a heat preservation box body, a preheating box body and a heating box body, wherein the heat preservation box body is fixedly installed on the rack, the preheating box body and the heating box body are arranged in the heat preservation box body, the heating assemblies are respectively arranged at the bottoms of the preheating box body and the heating box body, two ends of the air return pipeline are respectively communicated with an air outlet and an air inlet of the preheating box body, and two ends of the air return pipeline are respectively communicated with an air outlet and an air inlet of the heating box body.

Further, in the invention, the PLA straw conveying mechanism comprises a driving motor, a driving roller, a driven roller and a tensioning system, wherein the driving motor, the driving roller and the driven roller are all arranged on the rack, the driving roller is in transmission connection with the driven roller through a conveying belt, the driving motor drives the driving roller to rotate, and the conveying belt drives the PLA straw to penetrate through the preheating box body and the heating box body.

Further, in the invention, the conveyer belt is a Teflon grid conveyer belt, mesh stainless steel supporting plates are arranged in the preheating area and the constant temperature area, and the mesh stainless steel supporting plates support the conveyer belt.

Further, in the invention, the preheating box body and the heating box body are both provided with a plurality of temperature sensors;

the first air return pipeline and the second air return pipeline are composed of cover plates, the cover plates are made of stainless steel, heat preservation and insulation layers are attached to the outer surfaces of the cover plates, the cover plates are provided with low-power heating devices, and the first air return pipeline and the second air return pipeline are of detachable structures.

Further, in the invention, the heating component comprises a cast aluminum heating plate or a PTC heater, the purpose of heating is achieved by electrifying the cast aluminum heating plate or the PTC heater, a supporting plate is arranged at the bottom of the cast aluminum heating plate, and a heat preservation and insulation material layer is arranged on the surface between the cast aluminum heating plate and the bottom supporting plate.

Further, in the invention, a straw rolling device is arranged in the heating box body, and the PLA straw rolls through the straw rolling device.

Further, in the invention, one side of the heating box is provided with an air cooling system and a shaping device, the air cooling system is used for cooling the PLA straw coming out of the heating box, and the shaping device enables the PLA straw coming out of the heating box to roll so as to ensure the straightness of the PLA straw.

Further, in the invention, the straw rolling device and the shaping device both comprise fixed plates, the bottoms of the fixed plates are respectively provided with a high-temperature-resistant cotton and linen cloth strip, one end of the cotton and linen cloth strip is fixed with the fixed plate, and the other end of the cotton and linen cloth strip freely covers the surface of the straw.

Further, the invention also comprises a plc, a temperature control screen and a temperature control system.

The beneficial effects are that the technical scheme of this application possesses following technological effect:

according to the invention, the heating assembly is arranged at the bottom of the conveying belt for heating, hot air convection is fully utilized, the heating temperature in the crystallization furnace is kept stable and uniform, the preheating zone is arranged for preheating the PLA suction pipe, defective products caused by sudden contact of the PLA suction pipe with high temperature are avoided, the defective rate is reduced, the arrangement of the air return pipeline I and the air return pipeline II forms a hot air internal circulation backflow channel, high-efficiency hot air convection and heat effect are formed, the working efficiency of the crystallization furnace is greatly improved, and the energy consumption is reduced.

It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of the structural principle of the present invention.

FIG. 2 is a right side view of the present invention.

In the figures, the meaning of the reference numerals is as follows: 1. a frame; 2. a drive motor; 3. a drive roll; 4. a driven roller; 5. a conveyor belt; 6. a tensioning system; 7. a heat preservation box body; 8. heating the box body; 9. preheating the box body; 10. a heating assembly; 11. a second air return pipeline; 12. a first air return pipeline; 13. a constant temperature area; 14. a preheating zone; 15. a temperature sensor; 16. plc; 17. an air cooling system; 18. a shaping device; 19. a straw tumbling device; 20. a fan; 21. a PLA straw; 22. mesh stainless steel layer board.

Detailed Description

In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings. In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily defined to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.

As shown in fig. 1-2, this embodiment provides a PLA biodegradable straw crystallization furnace, which comprises a frame 1, a heat preservation box 7 and a PLA straw transmission mechanism, the heat preservation box 7 and the PLA straw transmission mechanism are both installed on the frame 1, the PLA straw transmission mechanism includes a driving motor 2, a driving roller 3, a driven roller 4 and a tensioning system 6, the driving motor 2, the driving roller 3, the driven roller 4 are all installed on the frame 1, the driving roller 3 is in transmission connection with the driven roller 4 through a conveyer belt 5, the driving roller 3 is driven by the driving motor 2 to rotate, the conveyer belt 5 drives a PLA straw 21 to pass through a preheating box 9 and a heating box 8.

The PLA biodegradable straw crystallizing furnace further comprises a preheating area 14 and a constant temperature area 13, wherein the preheating area 14 and the constant temperature area 13 are respectively composed of a preheating box body 9 and a heating box body 8, the preheating box body 9 and the heating box body 8 are arranged in a heat insulation box body 7, a PLA straw conveying mechanism enables a PLA straw 21 to be crystallized to sequentially pass through the preheating area 14 and the constant temperature area 13, the preheating area 14 and the constant temperature area 13 are respectively provided with a heating assembly 10, the heating assembly 10 is arranged at the bottom of a conveying belt 5, concretely, the heating assembly 10 is respectively arranged at the bottoms of the preheating box body 9 and the heating box body 8, the preheating area 14 and the constant temperature area 13 are respectively provided with a first air return pipeline 12 and a second air return pipeline 11, two ends of the first air return pipeline 12 are respectively communicated with an air outlet and an air inlet of the preheating box body 9, two ends of the second air return pipeline 11 are respectively communicated with an air outlet and an air inlet of the heating box body 8, the preheating area 14 and the constant temperature area 13 are both provided with a fan 20, heat air convection is formed to keep the heating temperature in the preheating zone 14 and the constant temperature zone 13 controllable and constant.

In this embodiment, the conveyer belt 5 is a teflon mesh conveyer belt, and the preheating zone 14 and the constant temperature zone 13 are both provided with mesh stainless steel pallets 22, which support the conveyer belt 5. The heating assembly 10 is convenient to heat from the lower side of the conveying belt 5, the thermal efficiency and the stability of the temperature are improved, and the Teflon conveying belt is supported by the mesh stainless steel supporting plates 22.

This embodiment heats through the bottom with heating element 10 setting and conveyer belt 5, make full use of hot-air convection, it is stable even to keep the heating temperature in the crystallization furnace, and set up preheating zone 14 and preheat PLA straw 21, avoid PLA straw 21 to contact the substandard product that high temperature leads to suddenly, the defective percentage has been reduced, setting through return air duct one 12 and return air duct two 11, hot-air inner loop return channel has been formed, efficient hot-air convection and heat effect are formed, the work efficiency of crystallization furnace is greatly improved, and the energy consumption is reduced.

In this embodiment, still include plc 16, control by temperature change screen and temperature control system, preheat box 9 and heating box 8 and all be provided with a plurality of temperature sensor 15, through temperature sensor 15, be convenient for the control preheat box 9 and heat 8 intracavity temperatures of box, then can be adjusted by temperature control system.

The first air return pipeline 12 and the second air return pipeline 11 are composed of cover plates made of stainless steel, heat preservation and insulation layers are attached to the outer surfaces of the cover plates, a low-power heating device is arranged on the cover plates, and the first air return pipeline 12 and the second air return pipeline are detachable in structure and convenient to detach and maintain.

In this embodiment, the heating assembly 10 includes a cast aluminum heating plate or a PTC heater, and the cast aluminum heating plate or the PTC heater is powered on to heat the aluminum heating plate or the PTC heater, a supporting plate is disposed at the bottom of the cast aluminum heating plate, and a heat insulating material layer is disposed on the surface between the cast aluminum heating plate and the bottom supporting plate. The heating plate or PTC heater with stable heating is adopted, the power is customized to about 50% of the heating power of the traditional oven, so that the heating power is convenient to test and leave certain surplus heating power, the heating plate can be heated in 8 or 16 sections, and the size of the heating plate can be 350 x 250 x 50 mm.

In this embodiment, be provided with straw rolling device 19 in the heating box 8, straw rolling device 19 makes the PLA straw roll.

In this embodiment, one side of heating cabinet is provided with air-cooling system 17 and shaping device 18, and air-cooling system 17 is used for cooling the PLA straw 21 that comes out from the heating cabinet, and shaping device 18 makes the PLA straw that comes out from the heating cabinet roll to guarantee PLA straw 21 straightness. Straw device 17 and shaping device 18 all include the fixed plate, and the fixed plate is installed respectively on insulation box 7 and heating box 8, and the bottom of fixed plate all is provided with high temperature resistant cotton-flax cloth, and the one end of cotton-flax cloth is fixed and the fixed plate, and the other end is free and cover on the straw surface, and the stiff end forms the contained angle with conveyor belt, and the straw of being convenient for freely passes through, utilizes the relative motion of belt and cotton-flax, drives the rotation of straw to realize the thermally equivalent of straw in the stove. The air-cooling system 17 may be provided as a cool air fan.

When the crystallizer is used, the driving motor 2 is started firstly, the driving roller 3 is driven to rotate by the driving motor 2, the driving roller 3 is in transmission connection with the driven roller 4 through the conveyer belt 5, the conveyer belt 5 drives the PLA straw 21 to firstly penetrate through the preheating box body 9 and the heating box body 8, at the moment, the cast aluminum heating plate or the PTC heater is electrified to generate heat, so that the temperature in the preheating box body 9 and the heating box body 8 is raised to a preset temperature, at the moment, hot air is raised to heat and crystallize the PLA straw 21, through the arrangement of the fan 20, the first air return pipeline 12 and the second air return pipeline 11, a hot air internal circulation backflow channel is formed, efficient hot air convection and heat effect are formed, the working efficiency of the crystallizer is greatly improved, the energy consumption is reduced, the PLA straw 21 is preheated in the preheating box body 9, the PLA straw 21 is heated and crystallized in the heating box body 8, and the stability and uniformity of the internal temperature are ensured, the defective rate is reduced, and meanwhile, the design of arrangement of double rows of PLA suction pipes can be adopted, so that the working efficiency of the crystallization furnace is greatly improved. In addition this embodiment has still add straw device 19 that rolls for PLA straw 21 rolls in heating box 8, has guaranteed the homogeneity of heating crystallization, is provided with air-cooled system 17 and shaping device 18 through one side at the heating cabinet, and air-cooled system 17 is used for cooling the PLA straw 21 that comes out from the heating cabinet, accelerates shaping speed, improves production efficiency, and shaping device 18 makes the PLA straw 21 that comes out from the heating cabinet roll, in order to guarantee PLA straw 21's straightness.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. The utility model provides a PLA biodegradable straw crystallization furnace, includes PLA straw transport mechanism, its characterized in that: still include preheating zone and thermostatic zone, PLA straw transport mechanism loops through preheating zone and thermostatic zone with the PLA straw of treating the crystallization, preheating zone and thermostatic zone all are provided with heating element, heating element sets up the bottom at the conveyer belt, preheating zone and thermostatic zone are provided with return air pipeline one and return air pipeline two respectively, return air pipeline both ends communicate with the built-in air outlet and the built-in air intake in preheating zone respectively, return air pipeline two both ends communicate with the built-in air outlet and the built-in air intake in thermostatic zone respectively, preheating zone and thermostatic zone all are provided with the fan, and formation hot air inner loop convection is in order to keep the controllable invariant of heating temperature in preheating zone and the thermostatic zone.

2. The PLA straw crystallization furnace of claim 1, wherein: the heating device comprises a preheating box body, a heating box body, an air return pipeline and a heating box body, and is characterized by further comprising a rack, a heat preservation box body, a preheating box body and a heating box body, wherein the heat preservation box body is fixedly installed on the rack, the preheating box body and the heating box body are arranged in the heat preservation box body, the heating component is respectively arranged at the bottoms of the preheating box body and the heating box body, two ends of the air return pipeline are respectively communicated with a built-in air outlet and a built-in air inlet of the preheating box body, and two ends of the air return pipeline are respectively communicated with a built-in air outlet and a built-in air inlet of the heating box body.

3. A PLA straw crystallization furnace as claimed in claim 2, wherein: PLA straw transport mechanism includes driving motor, drive roll, driven roller and tensioning system, driving motor, drive roll, driven roller are all installed in the frame, the drive roll passes through the conveyer belt and is connected with driven roller transmission, driving motor drive roll rotates, the conveyer belt drives the PLA straw and passes and preheat the box and heat the box.

4. A PLA straw crystallization furnace as claimed in claim 3, wherein: the conveyer belt is a Teflon grid conveyer belt, mesh stainless steel supporting plates are arranged in the preheating area and the constant temperature area, and the conveyer belt is supported by the mesh stainless steel supporting plates.

5. A PLA straw crystallization furnace as claimed in claim 2, wherein: the preheating box body and the heating box body are both provided with a plurality of temperature sensors;

6. A PLA straw crystallization furnace as claimed in claim 2, wherein: the heating assembly comprises a cast aluminum or PTC heating plate, the cast aluminum or PTC heating plate is electrified to achieve the purpose of heating, a supporting plate is arranged at the bottom of the cast aluminum heating plate, and a heat preservation and insulation material layer is arranged on the surface between the cast aluminum heating plate and the bottom supporting plate.

7. A PLA straw crystallization furnace as claimed in claim 2, wherein: be provided with the straw device that rolls in the heating cabinet, the straw device that rolls makes the PLA straw roll.

8. A PLA straw crystallization oven as in claim 7 wherein: one side of heating cabinet is provided with air-cooled system and shaping device, the air-cooled system is used for cooling the PLA straw that comes out from the heating cabinet, shaping device makes the PLA straw that comes out from the heating cabinet roll to guarantee the PLA straw straightness accuracy.

9. The PLA straw crystallization oven of claim 8, wherein: the straw rolling device and the shaping device both comprise fixing plates, high-temperature-resistant cotton-linen cloth strips are arranged at the bottoms of the fixing plates, one ends of the cotton-linen cloth strips are fixed on the fixing plates, and the other ends of the cotton-linen cloth strips freely cover the surfaces of the straws.

10. The PLA straw crystallization furnace of claim 1, wherein: the device also comprises a plc, a temperature control screen and a temperature control system.