Anti-streaming cooling structure for machine barrel of extruder

Abstract

The utility model relates to the technical field of plastic production equipment, in particular to an anti-streaming cooling structure for a machine barrel of an extruder, which comprises a plurality of cooling grooves arranged on the outer wall of the machine barrel, each cooling groove is connected into a circle end to end along the circumferential direction of the machine barrel, and a sealing groove is arranged at the top end of a spacing part between two adjacent cooling grooves along the circumferential direction of the machine barrel. Sealing rings are embedded in the sealing grooves, at least one water permeable hole penetrating through the cooling grooves in the two sides is formed in each interval part, the water permeable holes in every two adjacent interval parts are arranged in an up-down alternating mode, the cooling groove at the foremost end is connected with a water inlet pipe, and the cooling groove at the rearmost end is connected with a water outlet pipe; the outer wall of the machine barrel is sleeved with a sealing sleeve used for covering all the cooling grooves, the two ends of the sealing sleeve are connected with the outer wall of the machine barrel in a sealed mode, and a hooping piece is arranged at the position, corresponding to the sealing ring, of the outer wall of the sealing sleeve.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic production equipment, in particular to a barrel anti-cross-flow cooling structure of an extruder. Background Art

[0002] A large amount of heat is generated during the extrusion process of the extruder, which can easily cause the temperature of the material in the barrel (also called the barrel) to be too high. If the excessive heat is not discharged in time, it will cause the material (especially heat-sensitive plastics) to decompose. Therefore, the outer wall of the barrel of the extruder is usually equipped with a cooling system. There are two types of cooling systems that are more commonly used: air cooling and water cooling. Air cooling is relatively gentle and uniform, but the fan occupies a large space and the noise is also relatively large; water cooling has a fast cooling speed, small size, and low noise, but the cooling copper pipe wrapped around the barrel is prone to scale and clogging the pipe, and needs to be cleaned regularly. There are also some water cooling systems that open a spiral groove on the outer wall of the barrel, and then set a layer of sealing sleeve on the outside, using the spiral groove to form a cooling water path to cool the barrel. The cross-sectional area of ​​the spiral groove is much larger than the inner diameter of the ordinary cooling copper pipe, which reduces the possibility of pipe clogging.

[0003] In actual application scenarios, since there is no complete seal between the sealing sleeve and the outer wall of the barrel, and the existing cooling system usually sets the water inlet and outlet on the lower side of the barrel for the convenience of water inlet and outlet, in addition to the cooling water that normally flows in the spiral groove, a considerable amount of cooling water will flow directly from the water inlet to the water outlet along the gap between the bottom of the barrel and the sealing sleeve, which is called the cross-flow phenomenon in the industry. The cross-flow phenomenon will cause uneven cooling of the upper and lower parts of the barrel, affecting the heat dissipation effect of the barrel. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies in the above-mentioned background technology and provide a barrel anti-cross-flow cooling structure for an extruder, which effectively avoids the occurrence of the cross-flow phenomenon and improves the heat dissipation of the barrel.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A barrel anti-cross-flow cooling structure for an extruder includes a plurality of cooling grooves provided on the outer wall of the barrel, each cooling groove being connected to form a circle along the circumference of the barrel, a sealing groove being provided at the top of the interval between two adjacent cooling grooves along the circumference of the barrel, a sealing ring being embedded in the sealing groove, at least one water-permeable hole penetrating the cooling grooves on both sides being provided at each interval, the water-permeable holes on the two adjacent intervals being arranged in an alternating manner up and down, the cooling groove at the front end being connected to a water inlet pipe, and the cooling groove at the rear end being connected to a water outlet pipe; the outer wall of the barrel is provided with a sealing sleeve for covering all cooling grooves, the two ends of the sealing sleeve being sealed to the outer wall of the barrel, and a clamping piece being provided at the position corresponding to the outer wall of the sealing sleeve and the sealing ring. Through this scheme, the water-permeable holes connect all the sealing grooves to form a continuous cooling water path, and then through the sealing of the sealing ring, the water can only flow in the sealing grooves in sequence to avoid cross-flow.

[0007] In a further solution, the water-permeable hole is at a certain angle to the axis of the barrel. This solution can facilitate the drilling operation of the water-permeable hole and avoid interference of the drilling drill bit with adjacent interval parts.

[0008] In a further embodiment, all cooling grooves are arranged at equal intervals along the length of the barrel. With this embodiment, the barrel can be cooled evenly from front to back.

[0009] In a further solution, the water inlet pipe and the water outlet pipe are arranged staggered up and down with the water holes connected to the cooling grooves where they are located. Through this solution, the cooling water in the cooling grooves where the water inlet pipe and the water outlet pipe are located can flow along the circumference of the barrel, avoiding the cooling water from the water inlet pipe directly entering the frontmost water hole, or the cooling water from the rearmost water hole directly being discharged from the water outlet pipe, thereby ensuring the cooling effect.

[0010] In a further solution, the two ends of the sealing sleeve are sealed to the outer wall of the barrel by welding. This solution can not only fix the sealing sleeve, but also meet the sealing requirements.

[0011] The utility model has the beneficial effects that: the utility model utilizes the cooling groove and the water-permeable hole to form a continuous cooling water path, and then prevents the cross-flow phenomenon between adjacent cooling grooves through the sealing of the sealing ring and the sealing sleeve, so that the cooling water can flow in the front and rear directions in sequence. Specifically for a single cooling groove, the internal cooling water can flow along the circumference of the barrel, the upper and lower parts of the barrel are evenly cooled, and the heat dissipation effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0013] The figure includes: a barrel 1, a cooling groove 2, a water permeable hole 3, a sealing sleeve 4, a clamping member 5, a sealing ring 6, a water inlet pipe 7, a water outlet pipe 8, and a spacing part 9. DETAILED DESCRIPTION

[0014] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments, but the utility model is not limited to the following embodiments.

[0015] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0016] like Figure 1 As shown, this embodiment provides an anti-cross-flow cooling structure for the barrel of an extruder, including a plurality of cooling grooves 2 opened on the outer wall of the barrel 1, each cooling groove 2 is connected to form a circle along the circumference of the barrel 1, and all cooling grooves 2 are arranged at equal intervals along the length direction of the barrel 1.

[0017] A sealing groove is provided at the top of the spacing part 9 between two adjacent cooling grooves 2 along the circumference of the barrel 1, and a sealing ring 6 is embedded in the sealing groove. Each spacing part 9 is provided with at least one water-permeable hole 3 (the number is determined according to the flow rate, for example, 2 to 3) that passes through the cooling grooves 2 on both sides. The water-permeable hole 3 forms a certain angle with the axis of the barrel 1, and the angle is determined according to the height of the spacing part 9, in order to avoid the interference of the adjacent spacing part 9 with the drill bit when the drill bit performs the drilling operation.

[0018] The outer wall of the barrel 1 is provided with a sealing sleeve 4 for covering all cooling grooves 2. Both ends of the sealing sleeve 4 are sealed with the outer wall of the barrel 1. Obviously, the sealing sleeve and the outer wall of the barrel can also be sealed by using a sealing ring plus a hoop. This is the prior art and will not be elaborated on.

[0019] The outer wall of the sealing sleeve 4 and the corresponding part of the sealing ring 6 are provided with a clamping member 5. The clamping member 5 can be a hoop or a wire. Through the clamping of the clamping member 5, the sealing sleeve 4 can be partially deformed and fit closely with the sealing ring 6 to enhance the sealing effect. The two ends of the sealing sleeve 4 are sealed and connected with the outer wall of the barrel 1 by welding, and the sealing sleeve 4 can also be fixed.

[0020] The water holes 3 on two adjacent spacing parts 9 are arranged in an alternating manner, that is, the water holes 3 of the previous spacing part 9 are opened on the upper side of the barrel 1, and the water holes 3 of the next spacing part 9 need to be opened on the lower side of the barrel 1, so that cooling water can flow between the two water holes 3. Figure 1 In the embodiment, the frontmost cooling slot 2 is connected to a water inlet pipe 7, and the rearmost cooling slot 2 is connected to a water outlet pipe 8, and the water inlet pipe 7 and the water outlet pipe 8 are arranged vertically staggered with the water permeable holes 3 connected to the cooling slot 2. Generally, the water inlet pipe 7 is arranged at the lower side of the barrel 1, and the water outlet pipe 8 is arranged at the upper side of the barrel 1.

[0021] The cooling groove 2 in the prior art is spiral, and the spacing portion 9 of the cooling groove 2 is also spiral. Even if a sealing ring 6 is provided on the spacing portion 9 of the cooling groove 2, it is difficult to use the clamping member 5 to tighten the portion corresponding to the spiral sealing ring 6 from the outside of the sealing sleeve 4 (when the spiral clamping member 5 is tightened, local axial displacement will occur), so it is difficult to avoid the cross-flow phenomenon. The cooling groove 2 in this embodiment is annular, so the spacing portion 9 is also annular, and the position of the sealing ring 6 is relatively easier to determine. The clamping member 5 can tighten the portion corresponding to the sealing ring 6 on the outside of the sealing sleeve 4 to achieve sealing, and the clamping member 5 is not easy to produce axial displacement. The cooling grooves 2 are connected to form a coherent cooling water path through alternating upper and lower water permeable holes 3, such as Figure 1 As shown by the dotted arrow in the middle, the cooling water enters the front cooling groove 2 from the water inlet pipe 7 on the lower side of the barrel 1, flows upward, flows from the water permeable hole 3 on the upper side to the second cooling groove 2, then flows downward in the second cooling groove 2, then flows from the water permeable hole 3 on the lower side to the third cooling groove 2, flows upward in the third cooling groove 2, then flows from the water permeable hole 3 on the upper side to the fourth cooling groove 2, continues to flow downward, and so on, finally enters the last cooling groove 2 from the last water permeable hole 3 on the lower side, flows upward in the last cooling groove 2 until it is discharged from the water outlet pipe 8, and is then recycled after cooling.

[0022] In this embodiment, the number, spacing, depth, width of the cooling grooves 2 and the diameter of the water-permeable holes 3 are all determined according to the working conditions of the extruder.

[0023] The above is only a preferred embodiment of the utility model. For those skilled in the art, the utility model can be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A barrel anti-cross-flow cooling structure for an extruder, characterized in that: The invention comprises a plurality of cooling grooves (2) provided on the outer wall of a barrel (1), each cooling groove (2) being connected end to end along the circumference of the barrel (1) to form a circle, a sealing groove being provided at the top of a spacing portion (9) between two adjacent cooling grooves (2) along the circumference of the barrel (1), a sealing ring (6) being embedded in the sealing groove, each spacing portion (9) being provided with at least one water permeable hole (3) penetrating the cooling grooves (2) on both sides, the water permeable holes (3) on two adjacent spacing portions (9) being arranged in an alternating manner up and down, the frontmost cooling groove (2) being connected to a water inlet pipe (7), and the rearmost cooling groove (2) being connected to a water outlet pipe (8); the outer wall of the barrel (1) being provided with a sealing sleeve (4) for covering all the cooling grooves (2), the two ends of the sealing sleeve (4) being sealingly connected to the outer wall of the barrel (1), and a clamping member (5) being provided at a position corresponding to the outer wall of the sealing sleeve (4) and the sealing ring (6).

2. The barrel anti-cross-flow cooling structure of an extruder according to claim 1, characterized in that: The water permeable hole (3) forms a certain angle with the axis of the barrel (1).

3. The barrel anti-cross-flow cooling structure of an extruder according to claim 1, characterized in that: All cooling grooves (2) are arranged at equal intervals along the length direction of the barrel (1).

4. The barrel anti-cross-flow cooling structure of an extruder according to claim 1, characterized in that: The water inlet pipe (7) and the water outlet pipe (8) are arranged staggered up and down with respect to the water permeable holes (3) connected to the cooling trough (2) in which they are located.

5. The barrel anti-cross-flow cooling structure of an extruder according to claim 1, characterized in that: The two ends of the sealing sleeve (4) are sealed and connected to the outer wall of the barrel (1) by welding.

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