CN216400500U

CN216400500U - Square barrel of parallel double-screw extruder

Info

Publication number: CN216400500U
Application number: CN202120626899.3U
Authority: CN
Inventors: 陈晨
Original assignee: Nanjing Intelligent High End Equipment Industry Research Institute Co ltd
Current assignee: Nanjing Intelligent High End Equipment Industry Research Institute Co ltd
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2022-04-29
Anticipated expiration: 2031-03-25

Abstract

The utility model discloses a square machine barrel of a parallel double-screw extruder, which comprises a front end face flange, a connecting section, a rear end face flange and a machine barrel inner cavity penetrating through the front end face flange, the connecting section and the rear end face flange; a cooling structure is arranged between the inner cavity of the machine barrel and the outer wall of the machine barrel; the cooling structure extends from the liquid inlet hole to the liquid outlet hole through the spiral cooling flow channel and is used for circulating cooling media. Compare in prior art, the square barrel of parallel double screw extruder that this scheme provided dispels the heat evenly, the interior incrustation probability of water course is low, when promoting production efficiency, has reduced the interior dead angle of water course and has deposited incrustation scale and lead to the condemned condition of barrel.

Description

Square barrel of parallel double-screw extruder

Technical Field

The utility model relates to the field of extrusion equipment, in particular to a square cylinder of a parallel double-screw extruder.

Background

The traditional parallel double-screw extruder has the advantages that the machine barrel is mostly square, on one hand, the square machine barrel conforms to the structure of the parallel double screws, the weight of the machine barrel is reduced, and further the weight of the whole machine is reduced. On the other hand, the distances from the upper surface, the lower surface, the left surface and the right surface of the machine barrel to the screws are closer by the square machine barrel, so that the heat conduction efficiency is improved, the heat conduction capability of a heating plate in the parallel double-screw extruder is further improved, and the heating of the material by the heating plate is more uniform.

However, conventional parallel twin screw extruders have a barrel that is lightweight and efficient in heat transfer, and also have a problem with cooling. Due to the limitation of a machine barrel processing mode, a cooling system of a square machine barrel of a traditional parallel double-screw extruder adopts a linear cooling flow channel, and the problems of uneven cooling, low cooling efficiency and the like can occur in the production process of the cooling flow channel. For example, in the granulation of temperature sensitive plastics, uneven cooling can lead to the production of fish eye material, black material and other waste materials. Meanwhile, the barrel temperature is not uniform, and the problems of large waviness, inaccuracy and the like of the generated temperature measurement reading also seriously restrict the process of digital production.

In addition, the square cylinder of the traditional parallel double-screw extruder has high rejection rate. The main reason for the scrapping of the square cylinder is that the scale in the linear cooling flow channel in the cooling system can not be removed. As shown in fig. 1, the fouling sites in the square cylinder 2 are mainly concentrated at the included angle positions perpendicular to the linear cooling flow channel 1, such as the included angle positions for connecting the two ends of the linear cooling flow channel 1 in series and welding the outer cover plate 11 to form the groove, and the included angle positions of the linear cooling flow channel 1 and the liquid inlet and outlet holes 12, specifically, the circle positions in fig. 1 are the fouling sites. Due to the reasons of water rust, water scale, slag, impurities and the like which appear at the included angle position, the cooling flow channel can be blocked after the cooling system is used for a period of time, the water cooling efficiency of the cooling system is reduced, and the scale can not be removed in many cases, so that the square machine barrel is directly scrapped.

In addition, in the course of working, need to weld a sheet metal in the perpendicular face of linear type cooling runner 1, weld outer apron 11 promptly, because the welding degree of difficulty is big, appear the gap easily in the welding process, and then lead to the weeping condition, seriously influenced factory environment.

SUMMERY OF THE UTILITY MODEL

The utility model provides a square machine barrel of a parallel double-screw extruder, which solves the problems of uneven cooling temperature, low cooling efficiency, high scrapping probability caused by blockage and welding leakage of the existing machine barrel of the parallel double-screw extruder due to the adoption of a linear cooling flow channel.

A square machine barrel of a parallel double-screw extruder comprises a front end face flange, a connecting section, a rear end face flange and a machine barrel inner cavity penetrating through the front end face flange, the connecting section and the rear end face flange; a cooling structure is arranged between the inner cavity of the machine barrel and the outer wall of the machine barrel; the cooling structure extends from the liquid inlet hole to the liquid outlet hole through the spiral cooling flow channel and is used for circulating cooling media.

In the utility model, the spiral cooling flow channels distributed around the inner cavity of the machine barrel are adopted to cool the high-temperature melt, compared with the traditional square machine barrel, the cooling medium flowing through the spiral cooling flow channels has smaller distance with the surface of the inner cavity of the machine barrel and larger cooling area, thereby greatly improving the cooling efficiency.

Specifically, the distance between each part of the cooling channel and the wall of the oval inner cavity is equal, the distance Di is not smaller than the minimum distance of the vertical water channel in principle, and the requirement of the inlaying strength of the inner bushing needs to be considered. The length of the cooling flow channel of the original machine barrel and the diameter of the water channel are comprehensively considered when the minimum spiral turn number of the cooling flow channel is designed, and the cooling area can be designed to be multiple times of the original cooling flow channel but not smaller than the cooling area of the original machine barrel cooling flow channel.

Further, in one implementation, the cooling structure includes two first cooling flow channels and two second cooling flow channels side by side; a first liquid inlet hole and a first liquid outlet hole are formed in two ends of the first cooling flow channel; and a second liquid inlet hole and a second liquid outlet hole are formed in the two ends of the second cooling flow channel.

Further, in one implementation manner, the connection part between the two ends of the first cooling flow channel and the first liquid inlet and the first liquid outlet is in a smooth curve shape; and the connecting parts of the two ends of the second cooling flow channel and the second liquid inlet hole and the second liquid outlet hole are in a smooth curve shape. In the present invention, the smooth curve shape means that the slope changes continuously at the point without interruption (except that the slope does not exist at a point), and the curve is conductive. According to the utility model, through the connection mode, the situations of right-angle turning and the like are avoided, so that the two spiral cooling runners run smoothly without dead angles, and meanwhile, the cooling runners adopt a spiral structure, so that the whole cooling runner can effectively avoid slag and impurity residues from being gathered, and the blockage is prevented.

Further, in one implementation, the first liquid inlet hole and the second liquid outlet hole are located on the front end face flange, and the first liquid outlet hole and the second liquid inlet hole are located on the rear end face flange. In the utility model, cooling medium enters the cooling flow channel from the end surfaces of the two sides of the connecting section through the first liquid inlet hole and the second liquid inlet hole respectively, flows out from the first liquid outlet hole and the second liquid outlet hole after passing through the cooling flow channel distributed around the inner cavity of the cylinder, and finally takes away redundant heat in the square cylinder.

Because the pipeline temperature that is close to the feed liquor hole is minimum, and the pipeline temperature that is close to the liquid hole is higher than the pipeline temperature that is close to the feed liquor hole, and cooling medium is from cooling runner one side among the prior art, and the helical structure of the another side play takes place the local overheated phenomenon of cooling runner during the cooling easily, and the cooling medium body is longer in the stroke of cooling runner simultaneously, can't in time take away the heat. Compared with the prior art, the design of the double-cooling flow channels with the bidirectional water inlet and the parallel arrangement enables the cooling temperature of the whole machine barrel to be more uniform, the temperature measurement reading of the pipeline temperature is more accurate while the cooling efficiency is improved, and the monitoring efficiency of the working process of the machine barrel is further improved.

Further, in an implementation manner, the first liquid inlet hole, the first liquid outlet hole, the second liquid inlet hole and the second liquid outlet hole are threaded holes. In the utility model, the threaded hole comprises but is not limited to pipe threads, and is conveniently connected with pipelines of cooling equipment such as a water pump oil pump mold temperature controller and the like through threads or buckles. In the embodiment, the cooling flow channel is smoothly connected with the liquid inlet hole and the liquid outlet hole without dead angles, and meanwhile, the cooling flow channel adopts a spiral structure, so that the whole cooling flow channel can effectively avoid slag and impurity residues from being gathered and prevented from being blocked.

Further, in one implementation, the cooling structure is elliptical or 8-shaped in the shape of the barrel radial cross section. According to the cooling structure, the shape of the radial section of the machine barrel is set to be oval or 8-shaped, compared with the traditional linear flow channel, the cooling flow channels are uniformly distributed along the inner cavity of the machine barrel, so that the cooling flow channels can be uniformly close to the surface of the inner cavity of the machine barrel, the heat dissipation area is increased, the heat of the machine barrel is prevented from being accumulated at a certain position, and the effect of improving the cooling efficiency is achieved.

Further, in one implementation manner, flow direction changing devices are arranged outside the first cooling flow channel and the second cooling flow channel, and are used for changing the flowing direction of the cooling medium in the first cooling flow channel or the second cooling flow channel.

Further, in one implementation, the flow direction changing device includes a ferrule and an external connection elbow; the first liquid inlet hole is connected with the second liquid outlet hole through the cutting sleeve and the external connecting bent pipe, or the second liquid inlet hole is connected with the first liquid inlet hole through the cutting sleeve and the external connecting bent pipe. In the utility model, the liquid inlet and the liquid outlet which are positioned at the same end of the connecting section are connected with the external connecting bent pipe through the clamping sleeve extending out of the square machine barrel, and thus a double-helix cooling flow channel with a single inlet and outlet direction is formed. Specifically, the cutting ferrule and the external connecting bent pipe can adopt standard parts in the prior art.

Further, in one implementation, the number of cooling channels in the cooling structure is 1. The utility model adopts a single water channel design, and is used for extruding small-size extruders and plastic and products with low requirements on water temperature.

Further, in one implementation, the number of cooling channels in the cooling structure is an even number. In the utility model, the multi-channel design is applicable to the extrusion and preparation of large-size, high-yield or temperature sensitive materials.

In the prior art, a machine barrel of a parallel double-screw extruder adopts a linear cooling flow channel, so that the problems of inaccurate temperature measurement reading, local overheating of the machine barrel, low cooling efficiency, high scrapping probability caused by blockage and welding leakage exist. Compared with the prior art, the parallel double-screw extruder square barrel is adopted, water is fed in through the first liquid inlet hole and the second liquid inlet hole simultaneously in two directions, the temperature gradient curve rule is effectively utilized, and the problems of uneven water temperature and inaccurate temperature measurement reading are greatly improved; meanwhile, the length of the cooling flow channel is increased, and the heat exchange contact area of the machine barrel is increased, so that the heat dissipation effect is improved, and the production efficiency is improved. Simultaneously, novel water course passes through business turn over liquid hole axis and links to each other with spiral runner central line diagonal and the junction is the design of big radian fillet, has avoided circumstances such as quarter turn, and the cooling medium can smooth and easy pass through, the risk of greatly reduced jam. Meanwhile, the welding surface does not exist, so that the problem of end surface leakage caused by large-area welding is indirectly solved.

In addition, with the maturity of additive manufacturing technology and the development of powder technology, the cost of 3D metal printing is greatly reduced, and the square cylinder of the parallel double-screw extruder provided by the utility model can be directly printed and formed at one time through 3D metal printing, so that compared with the prior art, the manufacturing period is short, the efficiency is high, and the cost is controllable and acceptable.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a partial cross-sectional view of a linear cooling channel of a conventional parallel twin-screw extruder square barrel;

FIG. 2 is a perspective view of the overall structure of a square barrel of a parallel twin-screw extruder as provided in the examples section of the present application;

FIG. 3 is a front perspective view of a square barrel of a parallel twin screw extruder as provided in the examples section of the present application;

FIG. 4 is a side perspective view of a square barrel of a parallel twin screw extruder as provided in the examples section of the present application;

FIG. 5 is a perspective view of the overall structure of another dual cooling flow channel barrel as provided in the examples section of the present application;

FIG. 6 is a perspective view of the overall structure of another dual cooling flow channel barrel with a flow direction changing device as provided in the examples section of this application;

FIG. 7a is a front perspective view of an alternative single cooling flow channel barrel provided in part in an embodiment of the present application;

FIG. 7b is a side perspective view of another single cooling flow channel barrel provided in part in an embodiment of the present application;

FIG. 8 is a perspective view of the overall structure of another 8-shaped internal cavity barrel provided in part in the embodiments of the present application;

FIG. 9a is a front perspective view of an alternative barrel with a 8-shaped cavity as provided in the examples section of this application;

FIG. 9b is a side perspective view of an alternative barrel with a 8-shaped cavity as partially provided in embodiments of the present application;

wherein: 10-front end face flange, 20-connecting section, 30-rear end face flange, 40-machine barrel inner cavity, 50-cooling structure, 501-first cooling flow channel, 5011-first liquid inlet hole, 5012-first liquid outlet hole, 502-second cooling flow channel, 5021-second liquid inlet hole, 5022-second liquid outlet hole, 60-flow direction changing device, 601-cutting sleeve and 602-external connecting bent pipe.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The embodiment of the application discloses a square cylinder of a parallel double-screw extruder, which is applied to various plastic granulations (plastic modification granulation, filling granulation, reinforcing granulation, reaction synthesis granulation, blending granulation, recovery granulation, magnetic powder granulation, preparation of insulating materials, sheathing materials, low-smoke halogen-free flame-retardant PVC cable materials and various silane crosslinking materials for cables); extrusion of various plastic pipes, sheets, films, plates and composite products; extruding and producing a polystyrene foaming product; the method is used in the fields of scientific research, teaching, experiments, industrial production and the like.

As shown in fig. 2, the present embodiment provides a square barrel of a parallel twin-screw extruder, which comprises a front flange 10, a connecting section 20, a rear flange 30, and a barrel cavity 40 penetrating through the front flange 10, the connecting section 20, and the rear flange 30; a cooling structure 50 is arranged between the inner cavity 40 of the machine barrel and the outer wall of the machine barrel; the cooling structure 50 extends from the liquid inlet to the liquid outlet by a helical cooling channel for circulating a cooling medium. It is noted that the cooling structure 50 is a structure that is not exposed to the surface of the barrel in actual use, unlike the perspective view shown in fig. 2.

In this embodiment, the heliciform cooling flow channel that adopts to distribute around the barrel inner chamber cools off high temperature melt, compares with the square barrel of tradition, and the heliciform cooling flow channel is littleer with the distance on barrel inner chamber surface than traditional straight line water course, arranges more densely, and area of contact is bigger, and the cooling is more even, has increased substantially cooling efficiency.

In a square barrel of a parallel twin-screw extruder in the embodiment, the cooling structure 50 comprises two first cooling flow channels 501 and two second cooling flow channels 502 which are arranged side by side; a first liquid inlet hole 5011 and a first liquid outlet hole 5012 are formed in two ends of the first cooling runner 501; the two ends of the second cooling channel 502 are a second liquid inlet 5021 and a second liquid outlet 5022. Specifically, in this embodiment, the first cooling flow channel 501 and the second cooling flow channel 502 are arranged in parallel in the same spiral direction.

As shown in fig. 3 and 4, the first cooling channel 501 and the second cooling channel 502 are uniformly arranged along the shape of the inner cavity, the distance between each cooling channel and the wall of the elliptical inner cavity is equal, the distance Di should not be smaller than the minimum distance of the vertical channel design in principle, and the requirement of the inlaying strength of the inner liner needs to be considered. The length of the cooling flow channel of the original machine barrel and the diameter of the water channel are comprehensively considered when the minimum spiral turn number of the cooling flow channel is designed, and the cooling area can be designed to be multiple times of the original cooling flow channel but not smaller than the cooling area of the original machine barrel cooling flow channel. In this embodiment, set up to the heliciform through with cooling runner, increased the area of contact of cooling runner with the die cavity, promote cooling efficiency. It should be noted that fig. 3 is a front perspective view of the barrel structure shown in fig. 2, in fig. 3, the second liquid inlet hole 5021 and the second liquid outlet hole 5022 are overlapped due to the front view, so corresponding reference numbers are not shown in fig. 3, and specific reference numbers can refer to fig. 2. Similarly, fig. 4 is a side perspective view of the barrel structure shown in fig. 2, and in fig. 4, the first liquid outlet hole 5012 and the second liquid inlet hole 5021 are overlapped by taking a side view as a perspective view, so corresponding reference numerals are not shown in fig. 4, and specific reference numerals can refer to fig. 2.

In the square barrel of the parallel twin-screw extruder in this embodiment, the first cooling runner 501 is located at two ends of the spiral cooling runner of the connecting section 20, and the connecting portion between the two ends and the first liquid inlet hole 5011 and the first liquid outlet hole 5012 is in a smooth curve shape; the two ends of the second cooling channel 502 are connected with the second liquid inlet hole 5021 and the second liquid outlet hole 5022 through smooth channels, respectively, in a smooth curve shape. In the present invention, the smooth curve shape means that the slope changes continuously at the point without interruption (except that the slope does not exist at a point), and the curve is conductive. According to the utility model, through the connection mode, the situations of right-angle turning and the like are avoided, so that the two spiral cooling runners run smoothly without dead angles, and meanwhile, the cooling runners adopt a spiral structure, so that the whole cooling runner can effectively avoid slag and impurity residues from being gathered, and the blockage is prevented.

In the square barrel of the parallel double-screw extruder described in this embodiment, the first liquid inlet hole 5011 and the second liquid outlet hole 5022 are located on the front end face flange 10, and the first liquid outlet hole 5012 and the second liquid inlet hole 5021 are located on the rear end face flange 30. In this embodiment, the cooling medium enters the cooling flow channel from the end faces of the two sides of the connecting section 20 through the first liquid inlet hole 5011 and the second liquid inlet hole 5021, passes through the cooling flow channel distributed around the inner cavity 40 of the barrel, and then flows out from the first liquid outlet hole 5012 and the second liquid outlet hole 5022, so as to take away the excess heat in the square barrel.

Specifically, the orientation of each liquid inlet hole and each liquid outlet hole on the end face flange can be set according to the machine type of a specific machine barrel. As shown in fig. 2, the first liquid inlet hole 5011 and the second liquid outlet hole 5022 may be respectively located at the upper side and the lower side of the front flange 10, and the first liquid outlet hole 5012 and the second liquid outlet hole 5021 may be respectively located at the lower side of the rear flange 30.

In addition, as shown in fig. 5, in another embodiment, the first liquid inlet hole 5011 and the second liquid outlet hole 5022 are respectively located on the upper side and the lower side of the front flange 10, and the first liquid outlet hole 5012 and the second liquid outlet hole 5021 are also respectively located on the upper side and the lower side of the rear flange 30. In this embodiment, through changing the orientation of every feed liquor hole and play liquid hole on the end face flange, can richen the lectotype of extruder barrel, under the condition that does not change current extruder water route, accomplish the function of complete replacement.

In the square barrel of the parallel double-screw extruder described in this embodiment, the first liquid inlet hole 5011, the first liquid outlet hole 5012, the second liquid inlet hole 5021, and the second liquid outlet hole 5022 are threaded holes. In this embodiment, the threaded hole includes but not limited to pipe thread, conveniently passes through screw thread or buckle with cooling device's such as water pump oil pump mould temperature machine pipeline and is connected. In the embodiment, the cooling flow channel is smoothly connected with the liquid inlet hole and the liquid outlet hole without dead angles, and meanwhile, the cooling flow channel adopts a spiral structure, so that the whole cooling flow channel can effectively avoid slag and impurity residues from being gathered and prevented from being blocked.

In the square barrel of the parallel twin-screw extruder according to the present embodiment, as shown in fig. 2, the number of cooling channels in the cooling structure 50 is 2. In addition, in the square barrel of the parallel twin-screw extruder described in this embodiment, when the number of the cooling channels in the cooling structure 50 is a multiple of 2, the multi-channel design can be suitable for extruding and preparing large-size, high-yield or temperature-sensitive materials.

In the square barrel of the parallel twin-screw extruder described in this embodiment, a flow direction changing device 60 is provided outside the first cooling flow channel 501 and the second cooling flow channel 502, and is used for changing the flowing direction of the cooling medium in the first cooling flow channel 501 or the second cooling flow channel 502.

In the square barrel of the parallel twin-screw extruder in the embodiment, the flow direction changing device 60 comprises a clamping sleeve 601 and an external connecting bent pipe 602; the first liquid inlet hole 5011 is connected with the second liquid outlet hole 5022 through the cutting sleeve 601 and the external connecting bent pipe 602, or the second liquid inlet hole 5021 is connected with the first liquid outlet hole 5012 through the cutting sleeve 601 and the external connecting bent pipe 602, or the second liquid inlet hole 5021 is connected with the first liquid inlet hole 5011 through the cutting sleeve 601 and the external connecting bent pipe 602. In this embodiment, the liquid inlet and the liquid outlet at the same end of the connecting section 20 are connected through the cutting sleeve 601 and the external connecting elbow 602 extending out of the square barrel, so as to form a double-helix cooling flow channel in a single inlet and outlet direction. Specifically, the ferrule 601 is a standard component in the prior art, the bent pipe 602 is bent automatically according to the hole pitch, and the material can be copper pipes, steel pipes, plastic pipes and the like, specifically according to the field resource and environment.

As shown in fig. 6, two sets of cutting ferrules 601 and an external connecting bent pipe 602 are used to connect the first liquid outlet 5012 and the second liquid inlet 5021, so as to form a cooling channel with only one liquid inlet and one liquid outlet, which is intended for the modification of the conventional flat double extruder and the use of the extruder which is inconvenient to increase the water inlet and outlet. In this embodiment, because the corner position in the water course sets up in the barrel outside, when appearing blockking up, change the outside external connection return bend 602 of barrel can, compare in prior art, greatly reduced the condemned probability of barrel.

In a square barrel of a parallel twin-screw extruder according to the present embodiment, as shown in fig. 7a and 7b, the number of cooling channels in the cooling structure 50 is 1. In the embodiment, the single water channel design is adopted, and the extruder is used for extruding small-size extruders and plastic and products with low requirements on water temperature.

In a square barrel of a parallel twin-screw extruder as described in this example, the cooling structure 50 has an elliptical shape in a radial cross section of the barrel, as shown in FIG. 2. Alternatively, the cooling structure 50 may have a figure 8 shape in a radial cross section of the cylinder, as shown in fig. 8, 9a and 9 b. In this embodiment, the shape of the radial cross section of the barrel of the cooling structure 50 is set to be oval or 8-shaped, so that compared with the conventional linear flow channel, the cooling flow channel in this embodiment is uniformly distributed along the inner cavity of the barrel, so that the cooling flow channel can be uniformly close to the surface of the inner cavity of the barrel, the heat dissipation area is increased, the heat of the barrel is prevented from being accumulated at a certain position, and the effect of improving the cooling efficiency is achieved. Specifically, the shape of the cooling flow channel in the cooling structure 50 is designed according to the shape of the inner cavity, and the cooling flow channel is attached to the surface of the inner cavity of the machine barrel, so that a better cooling effect is achieved.

In the prior art, a machine barrel of a parallel double-screw extruder adopts a linear cooling flow channel, so that the problems of uneven cooling temperature, low cooling efficiency, high scrapping probability caused by blockage and welding liquid leakage are caused. Compared with the prior art, the parallel double-screw extruder square machine barrel is adopted, and water is fed in two directions simultaneously, so that the problems of uneven water temperature and inaccurate temperature measurement reading are solved; meanwhile, the contact area between the cooling flow channel and the cooling medium body is increased, so that the heat dissipation effect is improved, the production efficiency is improved, and the condition that the machine barrel is scrapped due to the fact that scales are accumulated at dead corners in the water channel is reduced. Simultaneously, novel water course passes through business turn over liquid hole axis and links to each other with spiral runner central line diagonal and the junction is the design of big radian fillet, has avoided circumstances such as quarter turn, and the cooling medium can smooth and easy pass through, the risk of greatly reduced jam. Meanwhile, the welding surface does not exist, so that the problem of end surface leakage caused by large-area welding is indirectly solved.

In addition, with the maturity of additive manufacturing technology and the development of powder technology, the cost of 3D metal printing is greatly reduced, the square cylinder of the parallel double-screw extruder provided by the utility model can be directly printed and formed through 3D metal printing, the manufacturing period is short, the efficiency is high, and the cost is controllable and acceptable.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the spirit and scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A square machine barrel of a parallel double-screw extruder is characterized by comprising a front end face flange (10), a connecting section (20), a rear end face flange (30) and a machine barrel inner cavity (40) penetrating through the front end face flange (10), the connecting section (20) and the rear end face flange (30); a cooling structure (50) is arranged between the inner cavity (40) of the machine barrel and the outer wall of the machine barrel; the cooling structure (50) extends from the liquid inlet hole to the liquid outlet hole through the spiral cooling flow channel and is used for circulating cooling media.

2. A parallel twin-screw extruder square barrel according to claim 1, characterised in that the cooling structure (50) comprises two first cooling flow channels (501) and second cooling flow channels (502) side by side; two ends of the first cooling runner (501) are provided with a first liquid inlet hole (5011) and a first liquid outlet hole (5012); and a second liquid inlet hole (5021) and a second liquid outlet hole (5022) are formed at two ends of the second cooling flow channel (502).

3. A parallel twin-screw extruder square barrel according to claim 2, characterised in that the first cooling channel (501) is smoothly curved at the connection of its two ends with the first inlet opening (5011) and the first outlet opening (5012); the connection part of the two ends of the second cooling flow channel (502) and the second liquid inlet hole (5021) and the second liquid outlet hole (5022) is in a smooth curve shape.

4. A parallel twin-screw extruder square barrel according to claim 2, characterised in that the first inlet opening (5011) and the second outlet opening (5022) are located in the front end flange (10) and the first outlet opening (5012) and the second outlet opening (5021) are located in the rear end flange (30).

5. The square barrel of a parallel twin-screw extruder of claim 4, wherein the first inlet hole (5011), the first outlet hole (5012), the second inlet hole (5021) and the second outlet hole (5022) are threaded.

6. A parallel twin-screw extruder square barrel according to claim 1, characterised in that the cooling structure (50) is oval or figure 8 in shape in the radial cross-section of the barrel.

7. A parallel twin-screw extruder barrel block according to claim 2, characterised in that flow direction changing means (60) are provided outside the first cooling flow channel (501) and the second cooling flow channel (502) for changing the direction of flow of the cooling medium in the first cooling flow channel (501) or the second cooling flow channel (502).

8. The parallel twin-screw extruder square barrel of claim 7, wherein the flow direction changing device (60) comprises a ferrule (601) and an external connecting elbow (602); the first liquid inlet hole (5011) is connected with the second liquid outlet hole (5022) through the clamping sleeve (601) and the external connecting bent pipe (602), or the second liquid inlet hole (5021) is connected with the first liquid outlet hole (5012) through the clamping sleeve (601) and the external connecting bent pipe (602), or the second liquid inlet hole (5021) is connected with the first liquid inlet hole (5011) through the clamping sleeve (601) and the external connecting bent pipe (602).

9. A parallel twin-screw extruder square barrel according to claim 1, characterised in that the number of cooling channels in the cooling structure (50) is 1.

10. A parallel twin-screw extruder square barrel according to claim 1 or 2, characterised in that the number of cooling channels in the cooling structure (50) is a multiple of 2.