A high efficiency barrel for plastic extrusion

Abstract

The utility model discloses a high -efficient machine cylinder for plastic extrusion, including feeding section and install the front machine cylinder of feeding section front side, and feeding section adopts split type detachable structure, including feeding outer cover and feeding inner cover, and the centre of feeding outer cover is provided with mounting hole, and feeding inner cover is detachably installed in mounting hole in, and the rear end portion of feeding inner cover has the head portion of small diameter relative to the pole body, and the rear end portion of feeding outer cover still detachably connected with the copper bush of blocking material, and the main body of copper bush of blocking material is inserted in the head portion of feeding inner cover, and with the inner wall interference fit of this head portion. Feeding inner cover is the vulnerable spare, can be individually fast change, and feeding outer cover is as the basic spare and can be recycled, and the customer maintenance cost has been greatly reduced. The utility model has the advantages of good economy, strong adaptability, energy -conserving and efficient, and is especially suitable for high -speed pipe material extrusion production line.

Description

Technical Field

[0001] This utility model relates to the field of plastic extrusion equipment manufacturing, specifically to a high-efficiency barrel for plastic extrusion. Background Technology

[0002] In high-speed pipe extrusion production lines, the barrel is the core component of the extruder. Currently, most barrels used are split-type interference fit structures, and their feeding section cannot be disassembled, resulting in the following defects: 1. When the inner wall of the feeding section wears down, the entire outer casing of the barrel must be replaced, resulting in waste and poor economic efficiency; 2. The inner casing cannot be flexibly replaced according to different materials or screw configurations, resulting in poor adaptability; 3. The heat from the heating zone of the front barrel will be conducted to the feeding section, increasing the cooling burden of the feeding section and leading to increased energy consumption.

[0003] Therefore, there is an urgent need for a barrel structure that can reduce maintenance costs, improve adaptability, and optimize energy consumption. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a detachable and efficient barrel structure that enables quick and individual replacement of the inner sleeve of the feeding section and recycling of the outer sleeve.

[0005] To achieve the above objectives, the technical solution adopted in this application is: a high-efficiency barrel for plastic extrusion, comprising a feeding section and a front barrel installed on the front side of the feeding section. The feeding section adopts a split and detachable structure, including a feeding outer sleeve and a feeding inner sleeve. The feeding outer sleeve has a mounting hole in its center. The feeding inner sleeve is detachably installed in the mounting hole. The rear end of the feeding inner sleeve has a head that is smaller than the diameter of the rod body. The rear end of the feeding outer sleeve is also detachably connected to a stop copper sleeve. The main body of the stop copper sleeve is inserted into the head of the feeding inner sleeve and is interference-fitted with the inner wall of the head.

[0006] In one feasible embodiment, the feeding inner sleeve includes an inner sleeve rod and a heat-conducting sleeve. The front part of the inner sleeve rod has a spirally extending cooling channel in the circumferential direction. The heat-conducting sleeve is sleeved on the outside of the inner sleeve rod and seals the cooling channel.

[0007] In one feasible embodiment, the mounting hole at the center of the feeding sleeve includes a first mounting hole, a second mounting hole, and a third mounting hole connected sequentially from back to front. The diameter of the second mounting hole is smaller than the diameter of the third mounting hole, which is smaller than the diameter of the first mounting hole. The inner sleeve rod of the feeding inner sleeve is located in the third mounting hole. The head of the feeding inner sleeve is inserted into the second mounting hole. The main body of the material blocking copper sleeve is inserted into the head of the feeding inner sleeve.

[0008] In one feasible embodiment, the head of the feeding inner sleeve is further provided with a pair of axially extending keyways, and the head is connected to the second mounting hole by a pair of fixed keys to prevent rotation.

[0009] In one feasible embodiment, the stop copper sleeve also has an ear connected to the rear end face of the main body, the ear being located in the first mounting hole and detachably connected to the stepped surface between the first mounting hole and the second mounting hole by screws.

[0010] In one feasible embodiment, the inner surface of the feeding inner sleeve is provided with an internal thread groove, the cross-section of the internal thread groove is arc-shaped, and the groove depth of the internal thread groove is initially uniform and then gradually decreases from back to front.

[0011] In one feasible embodiment, the inside of the stop copper sleeve is provided with a lubrication groove, the lubrication groove extends spirally along the inner wall surface of the main body, and the spiral direction of the lubrication groove is opposite to the spiral direction of the internal thread groove of the feeding inner sleeve.

[0012] In one feasible embodiment, the feeding outer sleeve has a feeding port, and the feeding inner sleeve has a feeding inlet, with the feeding port and feeding inlet facing each other.

[0013] In one feasible embodiment, the rear part of the front barrel is provided with a plurality of heat-insulating annular grooves along the circumferential direction.

[0014] In one feasible embodiment, the rear end face of the front barrel has a connecting flange, which is detachably connected to the front end face of the feeding jacket by screws.

[0015] This application has the following advantages compared with the prior art:

[0016] It allows for the individual replacement of the feeding inner sleeve, avoiding the scrapping of the entire outer sleeve of the barrel, saving customers a significant amount of maintenance costs and resulting in good economic benefits; different specifications of feeding inner sleeves can be quickly replaced according to different materials or process requirements, improving the versatility of the equipment and saving equipment costs; the rear end is equipped with a detachable material-blocking copper sleeve that rubs against the screw, ensuring the stability and maintainability of the structure, and can be quickly replaced after wear. Attached Figure Description

[0017] Figure 1 This is an overall assembly diagram of the barrel structure of this utility model.

[0018] Figure 2 This is an assembly diagram of the inner feeding sleeve and outer feeding sleeve of this utility model.

[0019] Figure 3 This is a cross-sectional structural diagram of the front barrel of this utility model.

[0020] Figure 4 yes Figure 1 A magnified view of a portion of point A in the middle.

[0021] Among them, 10, front barrel; 11, heat insulation ring groove; 12, connecting flange; 20, feeding jacket; 21, feeding port; 22, fixing key; 23, end face flange; 24, first mounting hole; 25, second mounting hole; 26, third mounting hole; 30, feeding inner sleeve; 31, internal thread groove; 32, feed inlet; 33, inner sleeve rod; 34, heat conducting sleeve; 35, cooling flow channel; 36, head; 361, keyway; 50, material blocking copper sleeve; 51, ear; 52, main body; 53, lubrication groove. Specific Implementation

[0022] To illustrate the technical content, structural features, achieved objectives, and effects of the invention in detail, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented independently without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, construction, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 4 As shown, this embodiment provides a high-efficiency barrel for a plastic pipe extruder. During the operation of the pipe extruder, the extrusion screw is rotatably installed in the high-efficiency barrel. Plastic masterbatch is fed into the barrel through the feed port of the feeding section, and is repeatedly sheared, crushed, and heated to a molten state during the rotation of the extrusion screw. The high-efficiency barrel mainly includes a front barrel 10 and a feeding section. The rear end face of the front barrel 10 has a connecting flange 12, and the feeding section adopts a split and detachable structure, installed on the rear side (or feed side) of the front barrel 10.

[0025] like Figure 2 As shown, the core components of the feeding section include a feeding outer sleeve 20 and a feeding inner sleeve 30.

[0026] The feeding jacket 20 is cylindrical in shape, and its front end is detachably fixed to the connecting flange 12 of the front barrel 10 by screws, thus assembling the entire barrel. A feeding port 21 is provided on the cylindrical wall of the feeding jacket 20 for feeding plastic raw materials. A stepped mounting hole is provided axially along the center of the feeding jacket 20, comprising a first mounting hole 24, a second mounting hole 25, and a third mounting hole 26 from back to front. The diameter of the second mounting hole 25 is smaller than that of the third mounting hole 26, and the diameter of the third mounting hole 26 is smaller than that of the first mounting hole 24, thus forming a two-stage stepped structure.

[0027] The inner feeding sleeve 30, as the component that directly contacts and conveys materials, is made of stainless steel with good thermal conductivity to optimize heat transfer. The inner feeding sleeve 30 is detachably installed in the mounting hole of the outer feeding sleeve 20. It mainly includes an inner sleeve rod 33 and a heat-conducting sleeve 34 fitted outside the inner sleeve rod 33. The front part of the inner sleeve rod 33 (i.e., the end near the front barrel 10) has a spirally extending cooling channel 35 on its outer surface along its circumference. The heat-conducting sleeve 34 is tightly fitted onto the inner sleeve rod 33, sealing the cooling channel 35 inside, forming a closed spiral cooling channel that allows the cooling medium (such as cooling water) to circulate, so as to precisely control the temperature of the feeding area.

[0028] The inner surface of the feeding sleeve 30 is provided with an internal threaded groove 31 for conveying plastic. The cross-section of the internal threaded groove 31 is designed as an arc to facilitate material flow. More optimized, the depth of the internal threaded groove 31 is not constant, but rather maintains a constant depth from back to front (i.e., from the inlet end to the outlet end) and then gradually decreases. This design helps the material to be gradually compressed and compacted during the conveying process, improving feeding efficiency.

[0029] The inner feeding sleeve 30 has an inlet 32 ​​at the position corresponding to the feeding port 21 on the outer feeding sleeve 20, so that the plastic raw material can smoothly enter the inner hole of the inner feeding sleeve 30.

[0030] The rear end of the inner feed sleeve 30 (i.e., the end furthest from the front barrel 10) is machined to have a head 36 with a diameter smaller than that of the inner sleeve rod 33 body. The outer diameter of this head 36 matches and is inserted into the second mounting hole 25 on the outer feed sleeve 20. To prevent the inner feed sleeve 30 from rotating during operation, a pair of axially extending keyways 361 are symmetrically formed on the outer peripheral wall of the head 36. Correspondingly, a pair of mating retaining keys 22 are installed in the second mounting hole 25 of the outer feed sleeve 20. When the inner feed sleeve 30 is inserted, the retaining keys 22 engage with the keyways 361, achieving an anti-rotation connection between the two.

[0031] See Figure 4At the rear end of the feeding sleeve 20, an end face flange 23 is detachably connected by screws. Inside the end face flange 23, specifically within the first mounting hole 24, a retaining copper sleeve 50 is installed. The retaining copper sleeve 50 includes a cylindrical body 52 and an ear 51 connected to the rear end face of the body 52. ​​The ear 51 is located within the first mounting hole 24 and is detachably fixed to the stepped surface between the first mounting hole 24 and the second mounting hole 25 by screws. The body 52 of the retaining copper sleeve 50 extends forward and inserts into the inner hole of the head 36 of the feeding inner sleeve 30. The outer wall of the body 52 and the inner wall of the head 36 are press-fitted to ensure a tight connection and effectively prevent material from overflowing from gaps.

[0032] Furthermore, a lubrication groove 53 is formed on the inner wall surface of the main body 52 of the feed sleeve 50. This lubrication groove 53 extends spirally along the inner wall. A key design feature is that the spiral direction of the lubrication groove 53 is opposite to the spiral direction of the internal thread groove 31 on the inner surface of the feed sleeve 30. This reverse spiral design enables the formation of a more effective lubricating film between the material and the inner wall of the sleeve, reducing friction and material adhesion.

[0033] See Figure 3 As a further optimization of this embodiment, several heat-insulating annular grooves 11 are machined circumferentially on the rear outer surface of the front barrel 10. These grooves can increase thermal resistance, reduce radiative heat transfer from the high-temperature zone of the front barrel to the feeding section, and help maintain the lower operating temperature required by the feeding section.

[0034] The assembly process of the barrel in this application is as follows:

[0035] First, insert the inner feeding sleeve 30 from the rear end of the outer feeding sleeve 20. Position the inner sleeve rod 33 within the third mounting hole 26, insert the head 36 into the second mounting hole 25, and use the fixing key 22 to position it to prevent rotation.

[0036] Next, the main body 52 of the stop copper sleeve 50 is aligned with the inner hole of the head 36 of the feed inner sleeve 30 and pressed in, and fixed by interference fit. Then, the ear 51 of the stop copper sleeve 50 is fixed to the stepped surface inside the feed outer sleeve 20 by screws.

[0037] Next, align the connecting flange 12 at the rear end of the front barrel 10 with the front end face of the feeding jacket 20, and tighten the connection with screws.

[0038] Finally, the end flange 23 is screwed onto the rear end face of the feed jacket 20, and the barrel is installed on the screw extruder to complete the overall assembly.

[0039] During operation, plastic granules enter the inner bore of the feeding sleeve 30 through the feed inlet 21 and feed port 32. The threads on the rotating screw (not shown) interact with the internal threaded groove 31 of the feeding sleeve 30, conveying the material forward. Cooling medium circulates in the cooling channel 35, carrying away heat. The retaining copper sleeve 50 effectively prevents material leakage backward. The counter-spiral design of the lubrication groove 53 and the internal threaded groove 31 improves the material flow. After initial compression and preheating in the feeding section, the material enters the front barrel 10 for further plasticization and extrusion. After a period of use, the retaining copper sleeve may change size due to wear and other reasons, and can be disassembled and replaced. Similarly, if it is necessary to replace the extruder screw or the feeding sleeve is worn and needs to be replaced, the feeding sleeve can be disassembled separately while the feeding outer sleeve is retained.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency barrel for plastic extrusion, comprising a feeding section and a front barrel (10) installed on the front side of the feeding section, characterized in that: The feeding section adopts a split and detachable structure, including a feeding outer sleeve (20) and a feeding inner sleeve (30). The feeding outer sleeve (20) has a mounting hole in the center. The feeding inner sleeve (30) is detachably installed in the mounting hole. The rear end of the feeding inner sleeve (30) has a head (36) that is smaller than the diameter of the rod. The rear end of the feeding outer sleeve (20) is also detachably connected to a stop copper sleeve (50). The body (52) of the stop copper sleeve (50) is inserted into the head (36) of the feeding inner sleeve (30) and is interference-fitted with the inner wall of the head (36).

2. The high-efficiency barrel for plastic extrusion according to claim 1, characterized in that: The feeding inner sleeve (30) includes an inner sleeve rod (33) and a heat-conducting sleeve (34). The front part of the inner sleeve rod (33) is provided with a spirally extending cooling channel (35) in the circumferential direction. The heat-conducting sleeve (34) is sleeved on the outside of the inner sleeve rod (33) and seals the cooling channel (35).

3. The high-efficiency barrel for plastic extrusion according to claim 2, characterized in that: The mounting holes at the center of the feeding sleeve (20) include a first mounting hole (24), a second mounting hole (25), and a third mounting hole (26) connected sequentially from back to front. The diameter of the second mounting hole (25) is smaller than the diameter of the third mounting hole (26) and smaller than the diameter of the first mounting hole (24). The inner sleeve rod (33) of the feeding inner sleeve (30) is located in the third mounting hole (26). The head (36) of the feeding inner sleeve (30) is inserted into the second mounting hole (25). The body (52) of the material blocking copper sleeve (50) is inserted into the head (36) of the feeding inner sleeve (30).

4. The high-efficiency barrel for plastic extrusion according to claim 3, characterized in that: The head (36) of the feeding inner sleeve (30) is also provided with a pair of axially extending keyways (361), and the head (36) and the second mounting hole (25) are connected to each other by a pair of fixed keys (22) to prevent rotation.

5. The high-efficiency barrel for plastic extrusion according to claim 3, characterized in that: The baffle copper sleeve (50) also has an ear (51) connected to the rear end face of the main body (52). The ear (51) is located in the first mounting hole (24) and is detachably connected to the stepped surface between the first mounting hole (24) and the second mounting hole (25) by screws.

6. The high-efficiency barrel for plastic extrusion according to claim 1, characterized in that: The inner hole surface of the feeding inner sleeve (30) is provided with an internal thread groove (31). The cross-section of the internal thread groove (31) is arc-shaped, and the groove depth of the internal thread groove (31) is initially equal in depth and then gradually decreases from back to front.

7. A high-efficiency barrel for plastic extrusion according to claim 6, characterized in that: The material stop copper sleeve (50) has a lubrication groove (53) inside. The lubrication groove (53) extends spirally along the inner wall surface of the main body (52), and the spiral direction of the lubrication groove (53) is opposite to the spiral direction of the internal thread groove (31) of the feeding inner sleeve (30).

8. The high-efficiency barrel for plastic extrusion according to claim 1, characterized in that: The feeding outer sleeve (20) is provided with a feeding port (21), and the feeding inner sleeve (30) is provided with a feeding port (32). The feeding port (21) and the feeding port (32) are opposite to each other.

9. A high-efficiency barrel for plastic extrusion according to claim 1, characterized in that: The rear part of the front barrel (10) is provided with several heat insulation annular grooves (11) along the circumferential direction.

10. A high-efficiency barrel for plastic extrusion according to claim 1, characterized in that: The rear end face of the front barrel (10) has a connecting flange (12), which is detachably connected to the front end face of the feeding jacket (20) by screws.

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