A side-vacuum extruder for flame-retardant engineering plastics

Abstract

The utility model discloses a kind of lateral vacuum-extraction extruders of flame-retardant engineering plastics, including driving mechanism, extrusion cylinder, blanking mechanism, support frame and storage box, storage box side is fixedly connected with pipe fitting, storage box is contacted with the receiving screen frame in the side close to pipe fitting, pipe fitting one end is fixedly connected with vacuum pump, the utility model is set with receiving screen frame in storage box, can preliminarily intercept the larger particle impurities possibly carried in the lateral vacuum-extraction process from extrusion cylinder, then the arc-shaped screen in arc-shaped frame further filters the gas into the link frame, blocks part of impurities and dust, cooperate the circular hole on arc-shaped rubber plate, while not affecting gas passing, can play certain blocking effect to impurities and dust, multistage filtration structure greatly reduces the impurity and dust amount entering vacuum system, reduces the case that impurities and dust adhere in vacuum pump gas inlet end, avoid the problem that vacuum pump operating load increases due to impurities adhesion.

Description

Technical Field

[0001] This utility model relates to the field of flame-retardant engineering plastics technology, specifically to a side-vacuum extruder for flame-retardant engineering plastics. Background Technology

[0002] Flame-retardant engineering plastics are high-performance polymer materials that can effectively prevent the spread of combustion in high-temperature or flame environments by adding flame retardants or by having flame-retardant properties themselves. Common engineering plastics are widely used in electrical and electronic, transportation, construction, aerospace and other fields. In order to avoid material leakage during the processing of flame-retardant engineering plastics, a side-vacuum extruder is selected.

[0003] Common side-vacuum extruders typically include an extrusion system, a transmission system, a heating and cooling system, and a vacuum system. After being stirred and kneaded, the material enters the vacuum chamber and remains under negative pressure for a certain period of time to degas. Then, it is mechanically extruded by a mud press and conveyed by a spiral cutter to achieve double degassing. Afterward, the melt passes through an annular constriction die base, and the porosity can be lower than 0.3%, greatly improving the material processing accuracy.

[0004] Some flame-retardant engineering plastics contain reinforcing materials such as glass fiber. During processing, wear occurs, causing impurities and dust to enter the vacuum system. These impurities and dust adhere to the inlet of the vacuum pump, increasing the operating load on the vacuum pump and affecting its vacuuming efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a side-vacuum extruder for flame-retardant engineering plastics, thereby reducing the entry of impurities and dust from the flame-retardant engineering plastics into the vacuum system and improving vacuum efficiency.

[0006] The technical solution adopted by this utility model to solve the technical problem is: a side-vacuum extruder for flame-retardant engineering plastics, including a drive mechanism, an extrusion cylinder, a feeding mechanism, a support frame, and a storage box. A pipe is fixedly connected to one side of the storage box, and a receiving mesh frame is in contact with the side of the storage box near the pipe. A vacuum pump is fixedly connected to one end of the pipe, and a control valve is fixedly connected to the side of the pipe near the air inlet of the vacuum pump. A first groove is provided on the bottom side of the storage box and the upper end of the support frame. A connecting frame is fixedly connected to the bottom end of the support frame at the first groove. The bottom end of the connecting frame is fixedly connected to one side of the outer wall of the extrusion cylinder. An arc-shaped frame is fixedly connected to the bottom end of the connecting frame. An arc-shaped baffle is fixedly connected inside the arc-shaped frame. A cross plate is fixedly connected to the side of the connecting frame near the first groove. An electric push rod is fixedly connected to the bottom end of the cross plate. An arc-shaped plate is fixedly connected to the output end of the electric push rod. The arc-shaped plate is hollow inside, and through holes are evenly provided on the upper and lower sides of the arc-shaped plate.

[0007] As a preferred technical solution of this utility model, the arc-shaped plate is fixedly connected to the arc-shaped frame side by an arc-shaped rubber plate by adhesive. The arc-shaped rubber plate has evenly distributed circular holes, and the circular holes correspond to the through holes.

[0008] As a preferred technical solution of this utility model, a plastic telescopic cover is fixedly connected to the end of the arc-shaped plate away from the arc-shaped rubber plate, and one end of the plastic telescopic cover is fixedly connected to the fixed end of the electric push rod.

[0009] As a preferred technical solution of this utility model, one end of the storage box is fixedly connected to a detachable plate by bolts, and a servo motor is fixedly connected to the end of the detachable plate away from the receiving mesh frame, and a fan is fixedly connected to the output end of the servo motor.

[0010] As a preferred technical solution of this utility model, a protective frame is provided on the outside of the fan, the protective frame is fixedly connected to one side of the detachable plate, and the protective frame abuts against the receiving mesh frame.

[0011] This utility model has the following advantages: (1) By setting a receiving mesh frame in the storage box, larger particulate impurities that may be carried during the vacuuming process from the side of the extrusion cylinder can be initially intercepted. An arc-shaped baffle is fixedly connected in the arc frame to further filter the gas entering the connecting frame and block some impurities and dust. The arc plate is hollow and has through holes evenly opened on the upper and lower sides. With the circular holes on the arc rubber plate, it can block impurities and dust to a certain extent without affecting the passage of gas. The multi-stage filtration structure greatly reduces the amount of impurities and dust entering the vacuum system. Through the above multi-stage filtration measures, the situation of impurities and dust adhering to the vacuum pump inlet end is reduced, avoiding the problem of increased vacuum pump operating load due to impurity adhesion, thereby ensuring that the vacuum pump can operate efficiently and stably and improving the vacuuming efficiency.

[0012] (2) One end of the storage box is fixedly connected to a detachable plate by bolts, which is convenient for disassembly and facilitates cleaning and maintenance of the receiving mesh frame and fan and other components inside the storage box. The electric push rod can adjust the position of the arc plate, which may facilitate cleaning or replacement of the arc baffle and arc plate and other related components, ensuring the long-term stable operation of the equipment.

[0013] (3) By setting a servo motor driven fan on the detachable plate, the setting of the fan can enhance the gas flow in the storage box, which helps to better guide the gas to the filter component for filtration, and also helps to improve the vacuuming effect. The setting of the protective frame protects the fan and also abuts against the receiving mesh frame, ensuring the stability of the structure. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of a side-vacuum extruder for flame-retardant engineering plastics according to a preferred embodiment of the present invention. Figure 2 This is a three-dimensional structural diagram of the storage box of a side-vacuum extruder for flame-retardant engineering plastics according to a preferred embodiment of the present invention. Figure 3 This is a three-dimensional cross-sectional view of the detachable plate of a side-vacuum extruder for flame-retardant engineering plastics, according to a preferred embodiment of this utility model.

[0015] Explanation of reference numerals in the attached drawings: 1. Drive mechanism; 2. Extrusion cylinder; 3. Feeding mechanism; 4. Support frame; 5. Storage box; 6. Pipe fitting; 7. Control valve; 8. Vacuum pump; 9. Detachable plate; 10. First groove; 11. Connecting frame; 12. Arc frame; 13. Electric push rod; 14. Arc plate; 15. Arc rubber plate; 16. Plastic telescopic cover; 17. Fan; 18. Protective frame; 19. Receiving mesh frame. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Please refer to the following: Figure 1-3 The illustrated side-vacuum extruder for flame-retardant engineering plastics includes a drive mechanism 1, an extrusion cylinder 2, a feeding mechanism 3, a support frame 4, and a storage box 5. A pipe fitting 6 is fixedly connected to one side of the storage box 5. A receiving mesh frame 19 is in contact with the side of the storage box 5 near the pipe fitting 6. A vacuum pump 8, model Leybold SV series, is fixedly connected to one end of the pipe fitting 6. A control valve 7, model Danfoss EV220B, is fixedly connected to the side of the pipe fitting 6 near the air inlet of the vacuum pump 8. The control valve 7 is controlled by a drive motor to rotate the valve plate. In this series, the bottom side of the storage box 5 and the upper end of the support frame 4 are both provided with a first groove 10. A connecting frame 11 is fixedly connected to the bottom end of the support frame 4 at the first groove 10. The bottom end of the connecting frame 11 is fixedly connected to one side of the outer wall of the extrusion cylinder 2. An arc-shaped frame 12 is fixedly connected to the bottom end of the connecting frame 11. The arc-shaped frame 12 and the arc-shaped baffle have the same curvature as the outer tube of the extrusion cylinder 2. To prevent material from entering the connecting frame 11 from the grooves on the bottom side of the extrusion cylinder 2 and the connecting frame 11, an arc-shaped plate 14 is provided for blocking. An arc-shaped baffle is fixedly connected inside the arc-shaped frame 12. A cross plate is fixedly connected to the side of the connecting frame 11 near the first groove 10. An electric push rod 13 is fixedly connected to the bottom end of the cross plate. The electric push rod 13 can be a Jiecang JC35 model. In this series, the output end of the electric push rod 13 is fixedly connected to an arc plate 14. The arc plate 14 is hollow, and through holes are evenly opened on the upper and lower sides of the arc plate 14. The vacuum pump 8 generates suction to make the storage box 5 negative pressure, and then draws the gas in the extrusion cylinder 2 to improve the material degassing efficiency.

[0018] Among them, the arc plate 14 is fixedly connected to the arc rubber plate 15 by adhesive on the side near the arc frame 12. The arc rubber plate 15 has evenly distributed circular holes, and the circular holes correspond to the through holes.

[0019] The connection method (adhesive fixing) between the arc-shaped plate 14 and the arc-shaped rubber plate 15, as well as the setting of the circular holes on the arc-shaped rubber plate 15, not only ensures the passage of gas but also further blocks impurities and dust, thereby improving the filtration effect.

[0020] Among them, a plastic telescopic cover 16 is fixedly connected to the end of the arc plate 14 away from the arc rubber plate 15, and one end of the plastic telescopic cover 16 is fixedly connected to the fixed end of the electric push rod 13.

[0021] By setting a plastic telescopic cover 16 between the arc plate 14 and the output end of the electric push rod 13, impurities and dust can be prevented from entering the area where the electric push rod 13 is located, thus protecting the electric push rod 13, while not affecting the movement of the arc plate 14 driven by the electric push rod 13.

[0022] Among them, one end of the storage box 5 is fixedly connected to the detachable plate 9 by bolts, and the detachable plate 9 is fixedly connected to the end away from the receiving mesh frame 19 by a servo motor, and the output end of the servo motor is fixedly connected to the fan 17.

[0023] By setting a detachable connection between the detachable plate 9 and the storage box 5, the removal of the detachable plate 9 can drive the synchronous removal of the servo motor and the fan 17, which facilitates the subsequent maintenance of the fan 17 and the servo motor. The servo motor is a Delta ASDA-B2 series, and the centrifugal fan 17 can be a Detong DTJ series industrial centrifugal equipment.

[0024] Among them, a protective frame 18 is provided on the outside of the fan 17. The protective frame 18 is fixedly connected to one side of the detachable plate 9, and the protective frame 18 abuts against the receiving mesh frame 19.

[0025] By setting a protective frame 18 on one side of the receiving mesh frame 19 and having the two abut against each other, the structural stability can be improved. During the maintenance period, the fan 17, the receiving mesh frame 19, etc. can be disassembled by removing the removable plate 9 for cleaning, which improves the convenience of cleaning. Furthermore, the receiving mesh frame 19 abuts against the connection between the storage box 5 and the pipe fitting 6, which can further reduce dust from contacting the air inlet of the vacuum pump 8 along with the airflow, making the device operate more stably.

[0026] Working Principle: Flame-retardant engineering plastic raw materials enter the extrusion cylinder 2 from the feeding mechanism 3. Then, the drive mechanism 1 drives the material to move inside the extrusion cylinder 2. The heating device on the extrusion cylinder 2 heats the material and forms the flame-retardant engineering plastic. During this process, the vacuum pump 8 starts to operate, evacuating the storage box 5 through the pipe 6 to create a negative pressure environment inside the storage box 5. The control valve 7 can control the airflow and flow rate, adjusting the vacuuming process according to actual needs. Because the storage box 5 is under negative pressure, it will draw in the gas generated by the material being squeezed in the extrusion cylinder 2. The negative pressure environment helps to extract these gases, achieving material degassing and improving material processing accuracy. For example, it can reduce melt porosity. The gas drawn from the extrusion cylinder 2 first passes through the storage box. The receiving mesh frame 19 within frame 5 intercepts larger particulate impurities carried in the gas, serving as a preliminary filter. The gas then enters the connecting frame 11 and passes through the arc-shaped baffle within the arc-shaped frame 12. The arc-shaped baffle further blocks some impurities and dust in the gas, reducing the impurity content entering subsequent structures. The gas then passes through the arc-shaped plate 14, which is hollow and has evenly distributed through holes on its upper and lower sides. Simultaneously, an arc-shaped rubber plate 15 is connected to the side of the arc-shaped plate 14 near the arc-shaped frame 12. The arc-shaped rubber plate 15 has evenly distributed circular holes corresponding to the through holes. When the gas passes through these holes, it further blocks impurities and dust without affecting the gas flow, achieving multi-stage filtration and greatly reducing impurities entering the vacuum system. To control dust levels and prevent impurities from adhering to the inlet of vacuum pump 8, ensuring efficient and stable operation of vacuum pump 8 and improving vacuuming efficiency, the fan 17 driven by the servo motor on the detachable plate 9 starts working, enhancing gas flow within the storage box 5. The fan 17 helps to better guide the gas to the receiving mesh frame 19, the arc-shaped baffle, and the arc-shaped plate 14 for filtration, while also improving the vacuuming effect, allowing the gas in the extrusion cylinder 2 to be extracted more quickly and effectively. The protective frame 18 on the outside of the fan 17 protects the fan 17 from collisions with external objects. At the same time, the protective frame 18 abuts against the receiving mesh frame 19, ensuring structural stability and making the device more reliable in operation. During the maintenance period, one end of the storage box 5 is connected via... The detachable plate 9 is bolted to the main body. When cleaning and maintenance are required for components such as the receiving mesh frame 19 and the fan 17 inside the storage box 5, simply removing the detachable plate 9 allows for easy operation of these components, ensuring long-term stable operation of the equipment. Furthermore, the electric push rod 13 on the connecting frame 11 can adjust the position of the arc-shaped plate 14. When cleaning or replacing the arc-shaped baffle and related components such as the arc-shaped plate 14, adjusting the position of the arc-shaped plate 14 via the electric push rod 13 facilitates related operations. Additionally, the plastic telescopic cover 16, fixedly connected to one end of the arc-shaped plate 14 away from the arc-shaped rubber plate 15, and fixedly connected to the fixed end of the electric push rod 13 at the other end, prevents impurities and dust from entering the area where the electric push rod 13 is located, thus protecting the electric push rod 13.This does not affect the movement of the curved plate 14.

[0027] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

[0028] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A side-vacuum extruder for flame-retardant engineering plastics, comprising a drive mechanism (1), an extrusion cylinder (2), a feeding mechanism (3), a support frame (4), and a storage box (5), characterized in that, A pipe fitting (6) is fixedly connected to one side of the storage box (5). A receiving mesh frame (19) is in contact with the side of the storage box (5) near the pipe fitting (6). A vacuum pump (8) is fixedly connected to one end of the pipe fitting (6). A control valve (7) is fixedly connected to the side of the pipe fitting (6) near the air inlet of the vacuum pump (8). A first groove (10) is provided on the bottom side of the storage box (5) and the upper end of the support frame (4). A connecting frame (11) is fixedly connected to the bottom end of the support frame (4) near the first groove (10). 1) The bottom end is fixedly connected to one side of the outer wall of the extrusion cylinder (2). The bottom end of the connecting frame (11) is fixedly connected to an arc frame (12). An arc baffle is fixedly connected inside the arc frame (12). A cross plate is fixedly connected to the side of the connecting frame (11) near the first groove (10). An electric push rod (13) is fixedly connected to the bottom end of the cross plate. An arc plate (14) is fixedly connected to the output end of the electric push rod (13). The arc plate (14) is hollow inside, and through holes are evenly opened on the upper and lower sides of the arc plate (14).

2. The side-vacuum extruder for flame-retardant engineering plastics as described in claim 1, characterized in that, The arc plate (14) is fixedly connected to the arc rubber plate (15) on the side near the arc frame (12) by adhesive. The arc rubber plate (15) has evenly distributed circular holes, and the circular holes correspond to the through holes.

3. The lateral vacuum extruder for flame-retardant engineering plastics as described in claim 2, characterized in that, A plastic telescopic cover (16) is fixedly connected to the end of the arc plate (14) away from the arc rubber plate (15), and one end of the plastic telescopic cover (16) is fixedly connected to the fixed end of the electric push rod (13).

4. The side-vacuum extruder for flame-retardant engineering plastics as described in claim 1, characterized in that, One end of the storage box (5) is fixedly connected to a detachable plate (9) by bolts. A servo motor is fixedly connected to the end of the detachable plate (9) away from the receiving mesh frame (19). A fan (17) is fixedly connected to the output end of the servo motor.

5. The side-vacuum extruder for flame-retardant engineering plastics as described in claim 4, characterized in that, The fan (17) is provided with a protective frame (18) on the outside. The protective frame (18) is fixedly connected to one side of the detachable plate (9). The protective frame (18) abuts against the receiving mesh frame (19).

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