Double-bulb melt pipeline for plastic extruder

Abstract

A double-bulb melt pipeline for a plastic extruder comprises two melt pipelines which are connected in a penetrating mode, the outer ends of the two melt pipelines are in a bulb shape, the inner ends of the two melt pipelines are in butt joint and then fixedly connected through flanges, and spherical flanges are arranged at the bulb positions of the outer ends of the melt pipelines and connected with connecting flanges on a front runner and a rear runner. The ball head is arranged in the spherical flange in a manner of swinging at a certain angle, a spherical pressing flange is also sleeved outside the ball head, the spherical pressing flange is connected with the spherical flange through an adjusting screw, and the rotation and positioning of the ball head are realized by unscrewing or screwing the adjusting screw. The melt pipeline fine adjustment device is reasonable in structural design, can realize fine adjustment of the melt pipeline in any direction and position, can bear large pipeline pressure, and meanwhile, materials flow smoothly, and the risk of material leakage is prevented.

Description

Technical Field

[0001] This utility model belongs to the field of polymer material processing machinery technology, and relates to a melt pipe for an extruder, and more particularly to a double-ball head melt pipe for a plastic extruder. Background Technology

[0002] Extruders are used to thoroughly mix and extrude various granular raw materials, primarily in the plastics or rubber manufacturing industry. During operation, the extruder heats the raw material to a viscous flow state. Under pressure, it is forced through a die of a specific shape, becoming a continuous body with a cross-section similar to the die shape. Cooling then transforms the viscous flow state into a highly elastic state, and finally, cooling and solidifying it into a glassy state to obtain the desired product.

[0003] The melt pipe is a crucial component of a plastic extruder, connecting the barrel and the die. Molten raw materials pass through the melt pipe to the die for extrusion into finished products. Melt pipes are typically rigid pipes with an external heating element, and are secured to each other using flanges. Sometimes, the die needs to be repositioned, requiring the melt pipe to be adjustable at a certain angle. However, rigid pipes cannot be adjusted, while flexible flow channels, although adjustable, lack sufficient pressure resistance for high-pressure applications.

[0004] An investigation revealed that the existing Chinese patent CN201410701174.0, entitled "Melting Pipeline Device for a Breathable Antibacterial Waste Recycling Screw Extruder," includes a first melt pipe and a second melt pipe. The first melt pipe has a through-flowing first melt channel, and the second melt pipe has a through-flowing second melt channel. The first and second melt pipes are detachably and seamlessly connected. The first and second melt channels are also fitted together. A receiving cavity is provided at the connection between the first and second melt channels, and a one-way valve is installed in the receiving cavity. This melting pipeline device can prevent the melt material in the main screw from flowing back into the recycling screw and monitors the temperature within the melting pipeline device, but it cannot adjust the direction of the melting pipeline.

[0005] Therefore, a new type of melt pipe needs to be developed that can both finely adjust the direction and withstand high pressure. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a double-ball head melt pipe for a plastic extruder with a reasonable structural design and adjustable angle, which can achieve fine adjustment of position in any direction and withstand large pipe pressure.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a double-ball-head melt pipe for a plastic extruder, characterized in that: it includes two through-connected melt pipes, the outer ends of the two melt pipes are ball-head shaped, the inner ends of the two melt pipes are joined together and fixedly connected by flanges, the outer ball-head of the melt pipe is provided with a spherical flange connected to the connecting flanges on the front and rear flow channels, the ball head is oscillatingly set inside the spherical flange at a certain angle, and a spherical pressing flange is also sleeved on the outside of the ball head, the spherical pressing flange is connected to the spherical flange by adjusting screws, and the rotation and positioning of the ball head can be achieved by loosening or tightening the adjusting screws.

[0008] As an improvement, the outer diameter, inner diameter, and ball head size of the two melt pipes are the same. The spherical flange is fitted over the front half of the ball head, and the spherical clamping flange is fitted over the rear half of the ball head. The inner diameter of the front opening of the spherical flange is coaxial with and has the same size as the inner diameter of the melt pipe.

[0009] Furthermore, the outer end outlet of the melt pipe is a tapered hole with an expanded diameter to facilitate material flow. Two grooves are machined circumferentially on the spherical surface of the ball head of the melt pipe, with a polytetrafluoroethylene sealing ring embedded in the first groove at the front end.

[0010] Furthermore, both grooves are formed on the front half of the ball head.

[0011] Furthermore, the opening on the side of the spherical clamping flange away from the spherical flange is a tapered shape with an expanded diameter, and the swing angle of the ball head of the melt pipe within the spherical flange is 1 / 2 of the opening cone angle of the spherical clamping flange.

[0012] Furthermore, the inner ends of the two molten material pipes are connected by a concave-convex face, and there are two flanges, wherein the first flange has a countersunk hole and the second flange has a corresponding screw hole, and the two are connected and fixed by screws.

[0013] Furthermore, the spherical flange has a through screw hole, and the spherical clamping flange has a corresponding countersunk hole. The two are connected together by adjusting screws. The spherical flange also has a connecting countersunk hole, which is connected and fixed to the connecting flanges of the front and rear flow channels by screws.

[0014] Finally, the melt pipe is covered with a heating coil.

[0015] Compared with existing technologies, the advantages of this invention are as follows: the outer ends of the two sets of melt pipes are designed in a spherical shape. Through the cooperation of spherical flanges and spherical clamping flanges, the spherical heads can swing at a certain angle. Furthermore, the outer diameter, inner diameter, and spherical head dimensions of the two sets of melt pipes are consistent. Thus, adjusting the two melt pipes simultaneously allows for changes in height or left / right position while maintaining the same direction for the front and rear flow channels. The melt flow channel outlet is machined into a conical hole, which, in conjunction with the inner spherical surface of the spherical flange, eliminates any dead flow angles. Two grooves are machined on the melt flow channel, inlaid with PTFE rings, effectively preventing material leakage at the spherical surface. This invention has a reasonable structural design, enabling fine-tuning of the melt pipe position in any direction while withstanding significant pipe pressure, ensuring smooth material flow, and preventing the risk of leakage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure after adjusting the height of the melt pipe;

[0018] Figure 3 for Figure 2 A schematic diagram of the structure of the ball head. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1-3 As shown, a double-ball-head melt pipe for a plastic extruder includes two through-connected melt pipes 1 and 2. The outer ends of the two melt pipes 1 and 2 are ball-shaped. The inner ends of the two melt pipes 1 and 2 are joined together and fixedly connected by flanges 5 and 6. A spherical flange 3 is provided at the ball head 11 at the outer end of the melt pipes 1 and 2, which is connected to the connecting flange 70 on the front and rear flow channels 7. The ball head 11 can be oscillatingly set inside the spherical flange 3. A spherical clamping flange 4 is also fitted outside the ball head 11. The spherical clamping flange 4 is connected to the spherical flange 3 by adjusting screw 9, and the rotation and positioning of the ball head 11 can be achieved by loosening or tightening the adjusting screw 9.

[0021] The specific structure is as follows: the outer diameter, inner diameter, and ball head 11 of the two melt pipes 1 and 2 are the same. The structure of melt pipe 1 will be described below. The spherical flange 3 is fitted and covers the front half of the ball head 11, and the spherical clamping flange 4 is fitted and covers the rear half of the ball head 11. The inner diameter of the front opening of the spherical flange 3 is coaxial with the inner diameter of the melt pipe 1 and has the same size, so it will not cause additional resistance to the material. The outer end outlet of the melt pipe 1 is a tapered hole 12 with an enlarged diameter to facilitate the flow of material. The outlet is enlarged and matches the inner spherical surface of the spherical flange 3. There are no dead corners in the flow, which reduces the resistance to material flow and prevents the material from stagnating and carbonizing. Two grooves, 1a and 1b, are machined circumferentially on the spherical surface of the ball head 11 of the melt pipe 1. Both grooves 1a and 1b are located on the front half of the spherical surface of the ball head 11. The first groove 1a contains a polytetrafluoroethylene (PTFE) sealing ring 10, which expands under heat to prevent material leakage. The second groove 1b releases leakage pressure. If material leaks through the sealing ring 10 into the second groove 1b, the pressure is reduced, and the material enters the entire annular groove instead of leaking out. The two grooves 1a and 1b also reduce the contact area between the melt pipe 1 and the spherical flange 3, increasing the clamping force and further reducing the risk of leakage. The opening of the spherical clamping flange 4 on the side away from the spherical flange 3 is a tapered shape with an expanded diameter 41. The angle of this tapered surface determines the swing angle of the ball head 11. The swing angle of the ball head 11 within the spherical flange 3 is half the opening tapered angle α of the spherical clamping flange 4. Figure 3 As shown.

[0022] The inner ends of the two molten material pipes 1 and 2 are connected by a concave-convex face. There are two flanges, of which the first flange 5 has a countersunk hole and the second flange 6 has a corresponding screw hole. The two are connected and fixed by hexagonal screws.

[0023] The spherical flange 3 has a through bolt hole, and the spherical clamping flange 4 has a corresponding countersunk hole. The two are connected together by adjusting screws 9. The spherical flange 3 also has a connecting countersunk hole, which is connected and fixed to the connecting flanges 70 of the front and rear flow channels 7 by screws.

[0024] Heating coils 8 are wrapped around the melt pipes 1 and 2 to heat and keep the material inside the pipes warm.

[0025] Its working principle is as follows: Loosening a set of adjusting screws 9 on the spherical clamping flange 4 allows the melt pipes 1 and 2 to rotate on the spherical flange 3. Tightening the adjusting screws 9 on the spherical clamping flange 4 then allows the angle of the front and rear flow channels 7 to deflect. Simultaneously adjusting the two melt pipes 1 and 2 allows the front and rear flow channels 7 to change their height or left / right position while maintaining the same direction. Figure 2 As shown.

[0026] The above description is only a preferred embodiment of the present 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 the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A double-ball-head melt pipe for a plastic extruder, characterized in that: It includes two through-connected melt pipes, the outer ends of which are spherical. The inner ends of the two melt pipes are joined together and fixedly connected by flanges. The outer spherical ends of the melt pipes are provided with spherical flanges that are connected to the connecting flanges on the front and rear flow channels. The spherical ends can be oscillating at a certain angle and are set inside the spherical flanges. A spherical clamping flange is also fitted outside the spherical ends. The spherical clamping flange is connected to the spherical flanges by adjusting screws, and the rotation and positioning of the spherical ends can be achieved by loosening or tightening the adjusting screws.

2. The double-ball-head melt pipe according to claim 1, characterized in that: The outer diameter, inner diameter, and ball head size of the two molten pipes are the same. The spherical flange is fitted over the front half of the ball head, and the spherical compression flange is fitted over the rear half of the ball head. The inner diameter of the front opening of the spherical flange is coaxial with and has the same size as the inner diameter of the molten pipe.

3. The double-ball-head melt pipe according to claim 2, characterized in that: The outer end of the melt pipe has an enlarged conical hole to facilitate material flow. Two grooves are machined around the ball head of the melt pipe, one at the front and one at the back. A polytetrafluoroethylene sealing ring is embedded in the first groove at the front end.

4. The double-ball-head melt pipe according to claim 3, characterized in that: Both grooves are formed on the front half of the ball head.

5. The double-ball-head melt pipe according to claim 1, characterized in that: The opening of the spherical clamping flange on the side away from the spherical flange is a tapered shape with an expanded diameter, and the swing angle of the ball head of the melt pipe inside the spherical flange is 1 / 2 of the opening cone angle of the spherical clamping flange.

6. The double-ball-head melt pipe according to any one of claims 1 to 5, characterized in that: The inner ends of the two molten material pipes are connected by a concave-convex face. There are two flanges, one of which has a countersunk hole and the other of which has a corresponding screw hole. The two are connected and fixed by screws.

7. The double-ball-head melt pipe according to any one of claims 1 to 5, characterized in that: The spherical flange has a through screw hole, and the spherical clamping flange has a corresponding countersunk hole. The two are connected together by adjusting screws. The spherical flange also has a connecting countersunk hole, which is connected and fixed to the connecting flanges of the front and rear flow channels by screws.

8. The double-ball-head melt pipe according to any one of claims 1 to 5, characterized in that: The melt pipe is covered with a heating coil.

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