CN209971493U - Temperature adjusting device of polylactic acid straw extruder and extruder - Google Patents
Temperature adjusting device of polylactic acid straw extruder and extruder Download PDFInfo
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- CN209971493U CN209971493U CN201920746426.XU CN201920746426U CN209971493U CN 209971493 U CN209971493 U CN 209971493U CN 201920746426 U CN201920746426 U CN 201920746426U CN 209971493 U CN209971493 U CN 209971493U
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Abstract
The utility model discloses a attemperator and extruder of polylactic acid straw extruder, attemperator include the extrusion feed cylinder, the extrusion feed cylinder is equipped with a plurality of thermoregulation units from feeding side direction discharge side segmentation, the thermoregulation unit is including heating module and air-cooled module, heating module is including laminating aluminium heating piece and temperature resistance on extrusion feed cylinder circumference lateral wall, the air-cooled module is including enclosing and closing aluminium heating piece all around air-cooled housing and with the air-blower that air-cooled housing air intake is linked together, be equipped with the forced air cooling cavity between air-cooled housing and the aluminium heating piece, the top of air-cooled housing is equipped with the air outlet. The device can control the forming temperature of the polylactic acid straw within +/-1 ℃, and greatly improves the forming quality of the polylactic acid straw.
Description
Technical Field
The utility model relates to an air-cooled technology, concretely relates to attemperator and extruder of polylactic acid straw extruder.
Background
The polylactic acid (PLA) is a thermoplastic aliphatic polyester prepared by using renewable plant resources such as corn, wheat, potato, beet and the like as raw materials and chemically synthesizing the raw materials by a ring-opening polymerization method and a direct polycondensation method, and is a green biological material which is widely applied at present. The waste polylactic acid product can be completely decomposed under the action of microorganisms, water, acid, alkali and the like, the decomposition products are water and carbon dioxide, or the waste polylactic acid product is degraded into lactic acid under the action of specific enzyme, so that the environment pollution is avoided.
PLA can be subjected to various molding processes like common polymers, such as extrusion, tape casting, film blowing, injection molding and the like. The plastic straw made of polylactic acid is non-toxic and harmless, and is a safe, environment-friendly, biodegradable and environment-friendly product.
However, the extrusion molding temperature range of the polylactic acid straw is narrow, the molding temperature of common plastic straws, such as polypropylene straws, can be controlled within +/-5 ℃, and the molding temperature of the polylactic acid straw needs to be controlled within +/-1 ℃. When the existing extruder for producing the common plastic straws is used for producing the polylactic acid straws, the yield is low due to the defects of the temperature control system, and the straw forming quality is poor.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect that temperature system exists among the prior art, the utility model provides a attemperator, extruder for polylactic acid straw extruder can be within 1 ℃ with the shaping temperature control of polylactic acid straw through the device, has greatly improved the shaping quality of polylactic acid straw.
Therefore, the utility model discloses a technical scheme is:
the utility model provides a attemperator for polylactic acid straw extruder, includes the extrusion feed cylinder, the extrusion feed cylinder is equipped with a plurality of thermoregulation units from feeding side direction discharge side segmentation, the thermoregulation unit includes heating module and air-cooled module, heating module is including laminating aluminium heating piece and temperature resistance on extrusion feed cylinder circumference lateral wall, the air-cooled module is including enclosing and closing aluminium heating piece all around air-cooled housing and with the air-blower that air-cooled housing air intake is linked together, be equipped with the forced air cooling cavity between air-cooled housing and the aluminium heating piece, the top of air-cooled housing is equipped with the air outlet.
Furthermore, the aluminum heating block comprises a first heating block and a second heating block which are oppositely combined, the first heating block and the second heating block are saddle-shaped, and resistance wires are arranged in the first heating block and the second heating block; the top of the two heating blocks is provided with a gap, and a temperature measuring resistor is inserted into the gap and used for measuring the surface temperature of the extruding barrel.
Furthermore, the air-cooled housing comprises an upper cover and a lower cover, the upper cover is hinged with the lower cover, a plurality of air outlets are uniformly distributed on the top of the upper cover, and an air inlet is formed in the bottom of the lower cover.
Furthermore, an air equalizing plate is arranged at the upper part of the air outlet, and an air outlet channel is arranged between the air equalizing plate and the upper cover.
Furthermore, the air blower is arranged at the bottom of the extruder through a support, and an air outlet of the air blower is directly communicated with an air inlet of the air-cooled housing.
A polylactic acid straw extruder comprises any one of the temperature adjusting devices of the polylactic acid straw extruder.
The utility model has the advantages that:
1. the utility model provides a attemperator simple structure easily realizes, and it is effectual to adjust the temperature for during polylactic acid straw extruder, can be with the shaping temperature control of polylactic acid straw within 1 ℃, greatly improved the shaping quality of polylactic acid straw.
2. The temperature adjusting device is connected with the automatic control system to realize automatic temperature adjustment, so that the forming quality of the polylactic acid straw is further ensured.
Drawings
Fig. 1 is a schematic view of a polylactic acid straw extruder provided with a first embodiment of the present application.
Fig. 2 is a sectional view taken along a-a of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and a preferred embodiment.
In the following description, the upper side of the polylactic acid straw extruder shown in fig. 1 is referred to as "upper" and the opposite side is referred to as "lower".
Referring to fig. 1 and 2, the polylactic acid straw extruder with the temperature adjusting device comprises a feed hopper 1, an extrusion screw, an extrusion head and an extrusion material barrel 2, wherein a plurality of temperature adjusting units 3 are arranged on the extrusion material barrel 2 from the feeding side to the discharging side in a segmented manner.
The temperature control system is characterized by further comprising a control console, wherein a PLC (programmable logic controller) and a display screen are arranged in the control console, and the display screen is used for displaying the temperature parameters of the temperature adjusting units. The console is prior art, and in this embodiment, the PLC controller is a siemens S7300 model.
In the embodiment, four temperature adjusting units 3-1, 3-2, 3-3 and 3-4 are arranged.
The extruding cylinder 2 and the four temperature adjusting units 3 form a temperature adjusting device.
Each tempering unit 3 comprises a heating module 32 and an air-cooling module 31.
The heating module 32 includes aluminum heating blocks 321 and 322 attached to the circumferential side wall of the extrusion barrel, and a temperature measuring resistor 323. The aluminum heating blocks 321, 322 are saddle-shaped and symmetrically arranged. Resistance wires are arranged in the aluminum heating blocks 321 and 322 and are connected with a power supply module through wires, and the power supply module is electrically connected with the PLC. In this embodiment, the two aluminum heating blocks 321 and 322 are joined to the circumferential side wall of the extrusion barrel 2 by welding, and a gap into which the temperature measuring resistor 323 is inserted is provided at the upper ends of the two aluminum heating blocks 321 and 322. The temperature measuring resistor 323 is electrically connected with the PLC controller through a lead. The temperature measuring resistor is the prior art, and in the embodiment, the model wzp2-269 is selected. The aluminum heating block is in the prior art, has good aluminum heat-conducting property, can surround the extrusion charging barrel and uniformly conduct heat to the extrusion charging barrel, and is beneficial to the forming of the suction pipe and the improvement of the forming quality.
The air cooling module 31 comprises an air cooling cover which surrounds the aluminum heating block, an air equalizing plate 313 and a blower 314. The air cooling housing comprises an upper cover 311 and a lower cover 312, wherein the upper cover 311 is hinged with the lower cover 312 through a rotating shaft. And a cold air cavity is arranged between the air cooling cover shell and the aluminum heating block. The lower cover 312 is fixed to the lower portion of the extrusion cylinder 2 by a bracket, and the upper cover 311 is rotatably opened around the rotation shaft. In this embodiment, the air-cooled casing is made of a steel plate having a thickness of 1 mm. The upper cover 311 is provided with uniformly distributed strip-shaped air outlets 3111, the air-equalizing plate 313 is arranged right above the air outlets of the upper cover through a bracket, and an air passing channel is arranged between the air-equalizing plate 313 and the upper cover 311. The bottom center of the lower cover 312 is provided with an air inlet 3121. The blower 314 is arranged below the discharging barrel 2 through a support, and an air outlet of the blower 314 is directly the same as the air inlet 3121 of the lower cover. The driving motor of the blower 314 is electrically connected with the PLC controller through a wire.
The operation principle of the temperature control device of the polylactic acid straw extruder according to embodiment 1 is briefly described as follows:
the polylactic acid raw material enters the extrusion barrel 2 from the hopper 1, moves from the feeding side to the discharging side under the pushing of a single screw or a double screw, is heated to be in a molten state in the moving process, is cooled gradually, and is finally extruded and molded from the extrusion head. The change of the state of the polylactic acid raw material is controlled by the temperature adjusting unit.
Taking the first temperature adjusting unit as an example, when the polylactic acid raw material passes through the first temperature adjusting unit 3-1, the PLC controller controls the power module to start, the first aluminum heating block is heated to conduct heat to the extrusion charging barrel 2, and the polylactic acid raw material is heated to melt; controlling the temperature of the first temperature adjusting unit 3-1 within a process requirement range, when the temperature measured by the temperature measuring resistor 323 is higher than the highest value of the process requirement, controlling the first aluminum heating block to be powered off by the PLC, simultaneously starting the first air blower 314-1, allowing cold air to enter the cold air cavity through the air inlet hole 3121 of the lower cover to heat and cool the first aluminum, and rapidly cooling the extrusion charging barrel; cold air is blown to the air equalizing plate 313 from the air outlet 3111 of the upper cover after heat exchange, and is uniformly distributed by the air equalizing plate 313 and then is blown out from air passing channels around the air equalizing plate; when the temperature measured by the temperature measuring resistor 323 is lower than the lowest value, the PLC controller controls the first blower 314-1 to stop rotating and controls the first aluminum heating block to be heated by electricity; the temperature of the first temperature adjusting unit 3-1 is always maintained within the range of the process requirement. The temperature adjusting principles of the second, third and fourth temperature adjusting units 3-2, 3-3 and 3-4 are the same as those of the first temperature adjusting unit; the difference is that different temperature ranges are set according to the technological parameters of the polylactic acid straw, and the temperature difference value of the fourth temperature regulating unit 3-4 is not higher than +/-1 ℃.
Parts which are not specifically described in the above description are prior art or can be realized by the prior art.
Claims (6)
1. The utility model provides a attemperator of polylactic acid straw extruder, includes the extrusion feed cylinder, its characterized in that, the extrusion feed cylinder is equipped with a plurality of thermoregulation units from feeding side direction discharge side segmentation, the thermoregulation unit includes heating module and air-cooled module, heating module is including laminating aluminium heating piece and temperature resistance on extrusion feed cylinder circumference lateral wall, the air-cooled module is including enclosing and closing aluminium heating piece all around air-cooled housing and with the air-blower that air-cooled housing air intake is linked together, be equipped with the forced air cooling cavity between air-cooled housing and the aluminium heating piece, the top of air-cooled housing is equipped with the air outlet.
2. The temperature adjusting device of a polylactic acid straw extruder as claimed in claim 1, wherein the aluminum heating block comprises a first heating block and a second heating block which are oppositely arranged, the first heating block and the second heating block are saddle-shaped, and resistance wires are arranged in the first heating block and the second heating block; the top of the two heating blocks is provided with a gap, and a temperature measuring resistor is inserted into the gap and used for measuring the surface temperature of the extruding barrel.
3. The temperature regulating device of polylactic acid straw extruder as claimed in claim 1, wherein said air-cooled housing comprises an upper cover and a lower cover, the upper cover is hinged with the lower cover, the top of the upper cover is provided with a plurality of air outlets uniformly distributed, and the bottom of the lower cover is provided with an air inlet.
4. The temperature adjusting device of polylactic acid straw extruder as claimed in claim 3, wherein an air-equalizing plate is arranged at the upper part of the air outlet, and an air outlet channel is arranged between the air-equalizing plate and the upper cover.
5. The temperature regulating device of polylactic acid straw extruder as claimed in claim 1, wherein said blower is disposed at the bottom of the extruder through a bracket, and the air outlet of the blower is directly communicated with the air inlet of the air-cooled housing.
6. A polylactic acid straw extruder, characterized by comprising the temperature adjusting device of the polylactic acid straw extruder according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920746426.XU CN209971493U (en) | 2019-05-22 | 2019-05-22 | Temperature adjusting device of polylactic acid straw extruder and extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920746426.XU CN209971493U (en) | 2019-05-22 | 2019-05-22 | Temperature adjusting device of polylactic acid straw extruder and extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209971493U true CN209971493U (en) | 2020-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920746426.XU Active CN209971493U (en) | 2019-05-22 | 2019-05-22 | Temperature adjusting device of polylactic acid straw extruder and extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209971493U (en) |
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2019
- 2019-05-22 CN CN201920746426.XU patent/CN209971493U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20210610 Address after: 210039 room B203, building 2 (alpha building), No.18, Fenghua Road, Yuhua Economic Development Zone, Nanjing City, Jiangsu Province Patentee after: NANJING JIEYANG MACHINERY Co.,Ltd. Address before: 210039 Room 102, building 5 (Gama building), No.18, Fenghua Road, Yuhua Economic Development Zone, Nanjing City, Jiangsu Province Patentee before: Nanjing Xinyang Intelligent Technology Co.,Ltd. |