extruder barrel, extruder
By setting up spiral heating and cooling channels inside the extruder barrel and using heat-conducting oil as the medium, the problems of high pressure loss, easy accumulation of dirt and poor cooling uniformity in the existing technology are solved, achieving high-precision temperature control and improved durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KRAUSSMAFFEI MACHINERY ZHEJIANG CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-06-16
AI Technical Summary
The existing extruder barrel has a reciprocating structure for the heating and cooling channels, which results in high pressure loss, easy accumulation of dirt, poor cooling uniformity, easy axial bending deformation of the barrel, and insufficient temperature control accuracy and resistance to extreme environments.
The extruder barrel is equipped with first and second spiral flow channel sections surrounding the hollow space, which are used for heating and cooling respectively. The heat transfer medium is heat transfer oil. The flow channel design reduces large turning angles, increases inertial centrifugal force to promote turbulence, and improves heat exchange effect. Oil inlet and outlet ports are provided at the connecting flange to facilitate leak detection.
It improves temperature control accuracy and flow channel durability, reduces dirt accumulation, lowers pressure loss, enhances cylinder temperature uniformity, extends cylinder service life, and reduces leakage risk.
Smart Images
Figure CN224360665U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of extrusion molding equipment design technology, specifically relating to an extruder barrel and an extruder. Background Technology
[0002] Currently, most extruder barrels on the market use an external heater for heating, and the cooling method is generally a reciprocating water cooling system. In practical applications, the entire barrel is first heated by the external heater, and then low-temperature deionized water is introduced through the reciprocating water channel for cooling. The two are dynamically adjusted to achieve the required temperature, and the temperature control accuracy is generally above 4°C. The aforementioned temperature control methods have the following shortcomings: (1) The heater needs to be switched on and off repeatedly at high temperatures, which can easily cause damage; (2) The thermal stability of water is not high, the thermal inertia is large, the temperature control is very difficult, the energy consumption is large, and the adaptability to harsh environments such as sub-zero environments is poor; (3) The reciprocating water channel has many bends, large turning angles, high pressure loss, and the water channel is easy to accumulate and difficult to clean; (4) The reciprocating water channel does not provide uniform cooling of the cylinder during the cooling process. If the temperature difference between different parts of the cylinder is too large, it can easily cause axial bending deformation of the cylinder; (5) The reciprocating water channel is often sealed at the end of the cylinder. Whether it is welded or sealed with a pin, once a leak occurs after the cylinder is connected, it is difficult to detect in time. This will cause pollution to the materials during production and affect the quality of the products.
[0003] For example, the invention patent with publication number CN101288997A, in order to overcome the shortcomings of the prior art, simultaneously sets up heating and cooling channels in the barrel and uses heat-conducting oil as the temperature control medium. It can overcome some of the aforementioned shortcomings that are common in the prior art to a certain extent. However, since its heating and cooling channels are axial reciprocating structures, the channels have many bends and large turning angles, resulting in high pressure loss and easy accumulation of dirt in the channels. At the same time, the reciprocating channels do not provide high uniformity of cooling to the barrel and are prone to insufficient axial bending deformation of the barrel. Based on the aforementioned shortcomings, this utility model is proposed. Utility Model Content
[0004] Therefore, the technical problem to be solved by this utility model is to provide an extruder barrel and an extruder that can overcome the technical problems in the prior art where the heating and cooling channels in the extruder barrel are reciprocating channels with many bends and large turning angles, resulting in high pressure loss, easy accumulation of dirt in the channels, low uniformity of cooling of the barrel, and easy axial bending deformation of the barrel.
[0005] To address the aforementioned problems, this utility model provides an extruder barrel, including a barrel body with a hollow space for assembling a screw. The barrel body is configured with a heating channel and a cooling channel. The heating channel has a first spiral channel section surrounding the hollow space, and the cooling channel has a second spiral channel section surrounding the hollow space. In the length extension direction of the barrel body, the first spiral channel section and the second spiral channel section alternate.
[0006] In some embodiments, the heat-conducting medium in both the heating channel and the cooling channel is heat-conducting oil; and / or, the interval between the first threaded channel section and the second threaded channel section is not less than 15 mm.
[0007] In some embodiments, the extruder barrel further includes connecting flanges at both ends of the barrel body, the connecting flanges having a connecting surface perpendicular to the length direction of the barrel body and an outer peripheral sidewall surface around the connecting surface, the heating channel having a first oil inlet and a first oil outlet, the cooling channel having a second oil inlet and a second oil outlet, and the first oil inlet, the first oil outlet, the second oil inlet and the second oil outlet are all constructed on the outer peripheral sidewall surface.
[0008] In some embodiments, the connecting flange includes a first flange at a first end of the cylinder and a second flange at a second end of the cylinder, wherein the first oil inlet and the second oil outlet are both located on the first flange, and the first oil outlet and the second oil inlet are both located on the second flange.
[0009] In some embodiments, a figure-eight hole communicating with the hollow space is formed on the connecting surface of the connecting flange, and a sealing gasket groove is also constructed on the connecting surface of the connecting flange, the sealing gasket groove being arranged around the figure-eight hole.
[0010] In some embodiments, the connecting flange has a process through hole extending along the length of the cylinder and communicating with the heating channel or cooling channel on its connecting surface, and a ball-expansion plug is interference-fitted into the opening of each process through hole; and / or, the distance between the heating channel and the figure-eight hole and the distance between the cooling channel and the figure-eight hole are 10mm to 40mm.
[0011] In some embodiments, the first spiral flow channel section includes a plurality of heating rings and heating connecting channels. Each heating ring is located in a plane perpendicular to the length direction of the cylinder. The heating connecting channels are located between two adjacent heating rings to connect the two adjacent heating rings. The second spiral flow channel section includes a plurality of cooling rings and cooling connecting channels. Each cooling ring is located in a plane perpendicular to the length direction of the cylinder. The cooling connecting channels are located between two adjacent cooling rings to connect the two adjacent cooling rings. The heating rings and the cooling rings alternate sequentially along the length extension direction of the cylinder.
[0012] In some embodiments, the cross-section of the cylinder is rectangular, and each of the heating rings and cooling rings is a rectangular ring. The straight flow channel of the rectangular ring has a threaded hole extending to the outer peripheral wall of the cylinder, and a throat plug is threaded into the threaded hole.
[0013] In some embodiments, the heating connection channel and the cooling connection channel include a connecting groove formed on the outer peripheral wall of the cylinder and a plate welded to the slot of the connecting groove.
[0014] This utility model provides an extruder barrel and extruder, in which the heating and cooling channels constructed within the barrel respectively have a first spiral channel section and a second spiral channel section arranged around the hollow space. Compared with the reciprocating channel in the prior art, the fluid path is longer. The inertial centrifugal force of the spiral channel makes the fluid more likely to form turbulence, thus achieving a better heat exchange effect. In contrast, the reciprocating channel in the prior art is more likely to form laminar flow, which makes the heat exchange effect of the channel in the prior art poor. At the same time, the spiral channel has no large turning angle, low pressure loss, and the fluid combined with centrifugal force can wash the channel wall, reducing dirt accumulation and extending the maintenance cycle. In addition, the spiral heat exchange channel can improve the temperature uniformity throughout the barrel, has little impact on barrel deformation, helps extend the service life of the barrel, and almost eliminates leakage problems caused by barrel deformation. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the extruder barrel according to an embodiment of the present utility model; the plate body is not shown in the figure.
[0016] Figure 2 yes Figure 1 A side view of the extruder barrel in one embodiment;
[0017] Figure 3 This is a top view (perspective) of the extruder barrel in use according to an embodiment of the present invention;
[0018] Figure 4 yes Figure 3The cross-sectional view of AA in the figure shows that the heating ring and cooling ring are similar in specific structure, so they are marked the same.
[0019] Figure 5 yes Figure 3 Sectional view of BB;
[0020] Figure 6 yes Figure 1 Front view;
[0021] Figure 7 yes Figure 1 Rear view.
[0022] The reference numerals in the attached figures are as follows:
[0023] 11. Cylinder body; 12. Connecting flange; 121. Figure-eight hole; 122. Sealing gasket groove; 123. Process through hole; 131. Connecting groove; 132. Plate body; 21. Heating channel; 211. First oil inlet; 212. First oil outlet; 213. Heating ring; 22. Cooling channel; 221. Second oil inlet; 222. Second oil outlet; 223. Cooling ring; 3. Throat plug; 4. Ejection threaded hole; 5. Connecting through hole; 6. Locating pin hole. Detailed Implementation
[0024] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, an extruder barrel is provided, including a barrel body 11. The barrel body 11 has a hollow space (not shown in the figure) for assembling a screw (not shown in the figure). The barrel body 11 is constructed with a heating channel 21 and a cooling channel 22. The heating channel 21 has a first spiral channel section (not shown in the figure) arranged around the hollow space, and the cooling channel 22 has a second spiral channel section (not shown in the figure) arranged around the hollow space. In the length extension direction of the barrel body 11, the first spiral channel section and the second spiral channel section alternate. It is understood that the aforementioned heating channel 21 and cooling channel 22 are independent of each other, and the heat-conducting medium inside them does not flow between them.
[0025] In this technical solution, the heating channel 21 and cooling channel 22 constructed inside the cylinder 11 respectively have a first spiral channel section and a second spiral channel section arranged around the hollow space. Compared with the reciprocating channel in the prior art, the fluid path is longer. The inertial centrifugal force of the spiral channel makes the fluid more likely to form turbulence, thus achieving a better heat exchange effect. In contrast, the reciprocating channel in the prior art is more likely to form laminar flow, which makes the heat exchange effect of the channel in the prior art poor. At the same time, the spiral channel has no large turning angle, low pressure loss, and the fluid combined with centrifugal force can wash the channel wall, reducing dirt accumulation and extending the maintenance cycle. In addition, the spiral heat exchange channel can improve the temperature uniformity of various parts inside the cylinder, has little impact on the cylinder deformation, helps to extend the service life of the cylinder, and almost eliminates leakage problems caused by cylinder deformation.
[0026] It is understood that the aforementioned heating channel 21 and cooling channel 22 are controllably connected to the heat source and cold source located outside the cylinder 11, respectively, so as to guide the hot or cold fluid at the target temperature into and out of the aforementioned heating channel 21 and cooling channel 22 for heat exchange to achieve the purpose of temperature control of the cylinder 11.
[0027] In a preferred embodiment, the heat-conducting medium in both the heating channel 21 and the cooling channel 22 is heat-conducting oil. In this technical solution, heat-conducting oil is selected as the heat-conducting medium instead of deionized water and gas. The heat-conducting oil has high thermal stability and low thermal inertia, resulting in higher precision in barrel temperature control (up to within 2°C). Furthermore, the oil itself does not generate wastewater or exhaust gas, has a low freezing point, strong high-temperature resistance, meets environmental protection requirements, and has strong working ability under extreme conditions.
[0028] The interval between the first threaded flow channel section and the second threaded flow channel section shall not be less than 15mm to prevent the cylinder 11 from cracking or other adverse phenomena caused by the alternation of hot and cold due to the small spacing.
[0029] In some embodiments, the extruder barrel further includes connecting flanges 12 at both ends of the barrel body 11. The connecting flanges 12 have a connecting surface (not labeled in the figure) perpendicular to the length direction of the barrel body 11 and an outer peripheral sidewall surface (not labeled in the figure) around the connecting surface. The heating channel 21 has a first oil inlet 211 and a first oil outlet 212, and the cooling channel 22 has a second oil inlet 221 and a second oil outlet 222. The first oil inlet 211, the first oil outlet 212, the second oil inlet 221, and the second oil outlet 222 are all constructed on the outer peripheral sidewall surface.
[0030] In this technical solution, the oil inlet and outlet of the heating channel 21 and the cooling channel 22 are respectively located on the outer peripheral side wall of the connecting flange. This allows for more intuitive and convenient detection of leakage at the connection point, ensuring product quality. However, it is understandable that when the aforementioned oil inlet and outlet are located on the connecting surface, since the connecting surface is hidden inside when the two cylinders 11 are connected, it is difficult to detect and deal with leakage at the oil inlet and outlet in a timely manner, which will contaminate the materials in the hollow space and thus reduce product quality.
[0031] In some implementations, see Figure 6 and Figure 7 As shown, the connecting flange 12 includes a first flange (not labeled in the figure) at the first end of the cylinder 11 and a second flange (not labeled in the figure) at the second end of the cylinder 11. The first oil inlet 211 and the second oil outlet 222 are both located on the first flange, and the first oil outlet 212 and the second oil inlet 221 are both located on the second flange.
[0032] In this technical solution, the first oil inlet 211 of the heating channel 21 and the second oil inlet 221 of the cooling channel 22 are respectively set on the first flange and the second flange at both ends of the cylinder 11, so that the heat-conducting medium in the heating channel 21 and the cooling channel 22 flows in opposite directions, which can help to further improve the temperature control accuracy.
[0033] In some implementation methods, see details. Figure 2 As shown, a figure-eight hole 121 communicating with the hollow space is formed on the connecting surface of the connecting flange 12. At this time, the aforementioned screw is a twin screw. A sealing gasket groove 122 is also constructed on the connecting surface of the connecting flange 12. The sealing gasket groove 122 is arranged around the figure-eight hole 121. When the two cylinders 11 are connected, the sealing gasket is embedded in the sealing gasket groove 122, thereby effectively preventing leakage at the connection surface of the two cylinders 11.
[0034] In some embodiments, the connecting surface of the connecting flange 12 is provided with a process through hole 123 extending along the length direction of the cylinder 11 and communicating with the heating flow channel 21 or the cooling flow channel 22. A ball-expansion plug (not shown in the figure, not indexed) is interference-fitted into the orifice of each process through hole 123. It is understood that the purpose of the aforementioned process through hole 123 is to facilitate the connection between the first spiral flow channel section and the oil inlet and outlet of the heating flow channel 21 on the connecting flange, and between the second spiral flow channel section and the oil inlet and outlet of the cooling flow channel 22 on the connecting flange. In this technical solution, the ball-expansion plug is used to form an interference seal on the process through hole 123, which has the advantage of reliable sealing.
[0035] The distance between the heating channel 21 and the figure-eight hole 121 and the distance between the cooling channel 22 and the figure-eight hole 121 are 10mm to 40mm, ensuring that the temperature control efficiency is at a high level.
[0036] In some embodiments, the first spiral flow channel segment includes multiple heating rings 213 and heating connecting channels (not labeled in the figure). Each heating ring 213 is located in a plane perpendicular to the length direction of the cylinder 11. The heating connecting channels are located between two adjacent heating rings 213 to connect the two adjacent heating rings 213. The second spiral flow channel segment includes multiple cooling rings 223 and cooling connecting channels (not labeled in the figure). Each cooling ring 223 is located in a plane perpendicular to the length direction of the cylinder 11. The cooling connecting channels are located between two adjacent cooling rings 223 to connect the two adjacent cooling rings 223. Each heating ring 213 and each cooling ring 223 alternate sequentially along the length extension direction of the cylinder 11. That is, the alternation of the first spiral flow channel segment and the second spiral flow channel segment can be specifically achieved by the arrangement of each heating ring 213 and cooling ring 223.
[0037] In this technical solution, by setting multiple heating rings 213 or cooling rings 223 at intervals along the length of the cylinder 11 and cutting into the vertical plane, as well as the corresponding heating connection channel and cooling connection channel, the manufacturing difficulty of the spiral channel can be simplified.
[0038] In one specific embodiment, the cross-section of the cylinder 11 is rectangular, and each of the heating rings 213 and cooling rings 223 is a rectangular ring. The straight flow channel of the rectangular ring has a threaded hole (not indicated in the figure) extending to the outer peripheral wall of the cylinder 11. A throat plug 3 is threaded into the threaded hole. In this technical solution, the rectangular heating rings 213 and cooling rings 223 form a shape match with the rectangular cylinder 11, thereby making the spiral flow channel objectively a rectangular spiral flow channel, which results in more uniform temperature control. The threaded connection of the throat plug 3 in the threaded hole on the outer peripheral wall of the cylinder 11 facilitates the maintenance and cleaning of each flow channel.
[0039] See details Figure 5 As shown, in some embodiments, the heating connection channel and the cooling connection channel include a connecting groove 131 formed on the outer peripheral wall of the cylinder 11 and a plate 132 welded to the groove opening of the connecting groove 131, which can ensure the sealing effect at the connecting groove 131 and prevent the leakage of heat transfer medium.
[0040] See further Figure 2As shown, on the connecting surface of the connecting flange 12, there are also ejector threaded holes 4, positioning pin holes 6 and connecting through holes 5. The ejector threaded holes 4 are screwed with threads to facilitate the disassembly of the two mating cylinders 11. Multiple connecting through holes 5 are arranged at intervals along the circumference of the connecting flange 12 to achieve reliable sealing of the two mating cylinders 11. The positioning pin holes 6 can accurately position the two mating cylinders 11.
[0041] This invention is currently applied in the barrel of the co-rotating twin-screw extruder GP1. The barrel has a length, width, and height of 720mm x 620mm x 510mm and weighs 900kg, which is a large extruder barrel. It adopts a spiral dual-channel temperature control structure (that is, the aforementioned technical solution of this utility model) and can achieve temperature control within ±1℃.
[0042] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.
[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above are only preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. An extruder barrel, characterized in that, Includes a cylinder (11) having a hollow space for assembling a screw, wherein a heating channel (21) and a cooling channel (22) are constructed inside the cylinder (11), the heating channel (21) having a first spiral channel section arranged around the hollow space, and the cooling channel (22) having a second spiral channel section arranged around the hollow space, wherein the first spiral channel section and the second spiral channel section alternately spaced along the length extension direction of the cylinder (11).
2. The extruder barrel according to claim 1, characterized in that, The heat-conducting medium in the heating channel (21) and cooling channel (22) is heat-conducting oil; and / or, the interval between the first threaded channel section and the second threaded channel section is not less than 15mm.
3. The extruder barrel according to claim 2, characterized in that, It also includes connecting flanges (12) at both ends of the cylinder (11), the connecting flanges (12) having a connecting surface perpendicular to the length direction of the cylinder (11) and an outer peripheral sidewall surface around the connecting surface, the heating channel (21) having a first oil inlet (211) and a first oil outlet (212), the cooling channel (22) having a second oil inlet (221) and a second oil outlet (222), the first oil inlet (211), the first oil outlet (212), the second oil inlet (221) and the second oil outlet (222) are all constructed on the outer peripheral sidewall surface.
4. The extruder barrel according to claim 3, characterized in that, The connecting flange (12) includes a first flange at the first end of the cylinder (11) and a second flange at the second end of the cylinder (11). The first oil inlet (211) and the second oil outlet (222) are both located on the first flange, and the first oil outlet (212) and the second oil inlet (221) are both located on the second flange.
5. The extruder barrel according to claim 3, characterized in that, The connecting flange (12) has a figure-eight hole (121) communicating with the hollow space on its connecting surface. A sealing gasket groove (122) is also constructed on the connecting surface of the connecting flange (12), and the sealing gasket groove (122) is arranged around the figure-eight hole (121).
6. The extruder barrel according to claim 5, characterized in that, The connecting flange (12) has a process through hole (123) extending along the length of the cylinder (11) and communicating with the heating channel (21) or the cooling channel (22). Each process through hole (123) is fitted with a ball-expansion plug; and / or, the distance between the heating channel (21) and the figure-eight hole (121) and the distance between the cooling channel (22) and the figure-eight hole (121) are 10mm to 40mm.
7. The extruder barrel according to claim 1, characterized in that, The first spiral flow channel section includes multiple heating rings (213) and heating connecting channels. Each heating ring (213) is located in a plane perpendicular to the length direction of the cylinder (11). The heating connecting channels are located between two adjacent heating rings (213) to connect the two adjacent heating rings (213). The second spiral flow channel section includes multiple cooling rings (223) and cooling connecting channels. Each cooling ring (223) is located in a plane perpendicular to the length direction of the cylinder (11). The cooling connecting channels are located between two adjacent cooling rings (223) to connect the two adjacent cooling rings (223). Each heating ring (213) and each cooling ring (223) alternate sequentially along the length extension direction of the cylinder (11).
8. The extruder barrel according to claim 7, characterized in that, The cross-section of the cylinder (11) is rectangular, and each of the heating rings (213) and cooling rings (223) is a rectangular ring. The straight flow channel of the rectangular ring has a threaded hole that extends to the outer peripheral wall of the cylinder (11), and a throat plug (3) is threaded into the threaded hole.
9. The extruder barrel according to claim 7, characterized in that, The heating connection channel and the cooling connection channel include a connecting groove (131) formed on the outer peripheral wall of the cylinder (11) and a plate (132) welded to the groove of the connecting groove (131).
10. An extruder, characterized in that, The extruder barrel includes any one of claims 1 to 9.