Extrusion molding device

Abstract

The utility model discloses an extrusion molding device which comprises a rack, an extrusion charging barrel is arranged on the rack, the extrusion molding device further comprises a pressure reducing mechanism and an exhaust mechanism, the pressure reducing mechanism and the exhaust mechanism are arranged on the extrusion charging barrel, and the exhaust mechanism is arranged at the side end of the pressure reducing mechanism; the pressure reducing mechanism comprises a first buffering frame, a buffering pressing plate and a second buffering frame, the buffering pressing plate is slidably connected to the side wall of the inner side of the first buffering frame, a cavity of the first buffering frame and the buffering pressing plate is set as a first cavity, and a cavity, close to one side of the extrusion material barrel, of the buffering pressing plate is set as a second cavity; the exhaust mechanism comprises a ventilation container, a breathable film and a third vacuum pump, and a plurality of square grooves are formed in the extrusion charging barrel. According to the extrusion molding device, negative pressure is generated in a ventilation container through a third vacuum pump, and gas in a cavity of an extrusion charging barrel is adsorbed in cooperation with a gas-permeable film, so that the gas pressure in a machine head is reduced to a certain extent, and the countercurrent phenomenon is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable production, in particular to an extrusion device. Background Art

[0002] In urban construction, wire and cable are an important part of infrastructure and an important channel for information transmission.

[0003] During the production process of wire and cable, an insulating layer needs to be wrapped on the outer layer of the wire and cable to avoid potential safety hazards to personnel and equipment, and to reduce external interference through the set insulating layer. An extrusion device is required during the production process of the insulating layer.

[0004] The existing extrusion devices include single-screw extruders, twin-screw extruders, and multi-screw extruders. Compared with other extruders, the price is relatively high. The single-screw extruder is cheap and widely used, and is suitable for the extrusion processing of general materials.

[0005] However, during the processing of a single-screw extruder, the fluidity of the material becomes poor due to temperature and material factors, resulting in reverse pressure on the material during the extrusion process, thereby increasing the head pressure. When the head pressure of the single-screw extruder is relatively high, backflow will increase. The backflow phenomenon will reduce the forward conveying amount of the material, thereby reducing the production efficiency.

[0006] Therefore, the utility model provides an extrusion device to solve the above problems. Content of the Utility Model

[0007] Aiming at the deficiencies of the prior art, the utility model provides an extrusion device to solve the above problems.

[0008] To achieve the above object, the utility model is realized through the following technical solutions: An extrusion device includes a frame, an extrusion barrel is arranged on the frame, and further includes a pressure reduction mechanism and an exhaust mechanism. The pressure reduction mechanism and the exhaust mechanism are arranged on the extrusion barrel, and the exhaust mechanism is arranged at the side end of the pressure reduction mechanism;

[0009] The pressure reduction mechanism includes a first buffer frame, a buffer pressing plate, and a second buffer frame. The buffer pressing plate is slidably connected to the inner side wall of the first buffer frame. The chamber of the first buffer frame and the buffer pressing plate is set as the first chamber, and the chamber on the side of the buffer pressing plate close to the extrusion barrel is set as the second chamber;

[0010] The exhaust mechanism includes an air exchange container, a breathable film, and a third vacuum pump. A plurality of square grooves are formed on the extrusion barrel, the breathable film is arranged in the square grooves, and the air exchange container is arranged on the breathable film.

[0011] Preferably, a driving motor is provided on the frame, a first coupling is fixedly connected to the output end of the driving motor, a speed reducer is fixedly connected to the end of the first coupling away from the driving motor, and a second coupling is fixedly connected to the output end of the speed reducer.

[0012] Preferably, a rotating shaft is fixedly connected to the end of the second coupling away from the speed reducer, a feeding cylinder is provided on the extrusion barrel, and three first heaters are fixedly connected to the outside of the extrusion barrel.

[0013] Preferably, a second heater is fixedly connected to the outside of the extrusion barrel, a screw is fixedly connected to the side of the rotating shaft away from the speed reducer, and the screw is arranged inside the extrusion barrel.

[0014] Preferably, the pressure reducing mechanism further includes a second ventilation pipe, the second ventilation pipe is communicated with the second buffer frame, a second branch air pipe is communicated with the end of the second ventilation pipe away from the second buffer frame, and a second annular air distributor is communicated with the end of the second branch air pipe close to the speed reducer.

[0015] Preferably, the pressure reducing mechanism further includes a second fixing frame, the second fixing frame is fixedly connected to the extrusion barrel, the second annular air distributor is fixedly connected to the second fixing frame, a second air exchange pipe is communicated with the second annular air distributor, and a second vacuum pump is communicated with the end of the second air exchange pipe away from the second annular air distributor, and the second vacuum pump is arranged on the frame.

[0016] Preferably, four first notches and four second notches are formed on the extrusion barrel, the first buffer frame is arranged on the first notch, the second buffer frame is arranged on the second notch, a first ventilation pipe is communicated with the first buffer frame, a first branch air pipe is communicated with the end of the first ventilation pipe away from the first buffer frame, a first annular air distributor is communicated with the end of the first branch air pipe close to the speed reducer, a first fixing frame is fixedly connected to the extrusion barrel, the first annular air distributor is fixedly connected to the first fixing frame, a first air exchange pipe is communicated with the first annular air distributor, and a first vacuum pump is communicated with the end of the first air exchange pipe away from the first annular air distributor, and the first vacuum pump is arranged on the frame.

[0017] Preferably, a third ventilation pipe is communicated with the air exchange container, and a third branch air pipe is communicated with the end of the third ventilation pipe away from the air exchange container.

[0018] Preferably, a third annular air distributor is communicated with the end of the third branch air pipe close to the speed reducer, the third annular air distributor is arranged on the extrusion barrel, a third air exchange pipe is communicated with the third annular air distributor, and the third air exchange pipe is communicated with a third vacuum pump, and the third vacuum pump is arranged on the frame.

[0019] Preferably, the breathable membrane material is polytetrafluoroethylene.

[0020] Advantages

[0021] The present utility model provides an extrusion device. Compared with the prior art, it has the following advantages:

[0022] (1) An extrusion device, through the third vacuum pump, generates negative pressure in the air exchange container, and then cooperates with the breathable membrane to adsorb the gas in the extrusion barrel chamber, thereby reducing the air pressure inside the machine head to a certain extent, improving the backflow phenomenon, and improving work efficiency.

[0023] (2) An extrusion device, discharges the gas in the first chamber of the first buffer frame through the first vacuum pump, thereby controlling the air pressure in the first chamber, and uses the pressure to control the up and down movement of the buffer pressing plate, so that the spatial size of the first chamber and the second chamber changes, and the second chamber connected to the inner cavity of the extrusion barrel changes, thereby reducing the pressure of the machine head and improving work efficiency;

[0024] (3) An extrusion device, through a pressure reducing mechanism, uses the first vacuum pump and the second vacuum pump to rotate in opposite directions, so that the space in the second chamber inside the first buffer frame and the second buffer frame alternately increases or decreases, avoiding the material staying in the second chamber for too long, resulting in the possibility of material accumulation at the cavity, and secondly, avoiding the material staying in the extruder for too long, being heated for a long time, resulting in over-plasticization, and thus deteriorating the material properties.

[0025] (4) An extrusion device, through an exhaust mechanism, reduces the gas in the inner cavity of the extrusion barrel, reduces problems such as bubbles and defects on the product surface, and improves product quality.

[0026] (5) An extrusion device, through the third vacuum pump, generates positive pressure inside the air exchange container, and when the device is not working, uses the airflow to perform gas backflushing on the breathable membrane, thereby facilitating the cleaning of impurities on the breathable membrane, avoiding blockage, and maintaining the exhaust efficiency. Description of the Drawings

[0027] Figure 1 is the side view of the overall structure of the present utility model;

[0028] Figure 2 is the oblique side view of the overall structure of the present utility model;

[0029] Figure 3 is the top view of the overall structure of the present utility model;

[0030] Figure 4 is the A-A cross-sectional view of the overall structure of the present utility model;

[0031] Figure 5It is a side view of the pressure reducing mechanism structure of the present utility model;

[0032] Figure 6 It is a side view of the exhaust mechanism structure of the present utility model;

[0033] Figure 7 It is of the present utility model Figure 4 Partial A structure diagram;

[0034] Figure 8 It is of the present utility model Figure 4 Partial B structure diagram.

[0035] In the figure, 1 is the frame; 2 is the driving motor; 3 is the first coupling; 4 is the reducer; 5 is the second coupling; 6 is the rotating shaft; 7 is the feeding cylinder; 8 is the extrusion cylinder; 9 is the first heater; 10 is the second heater;

[0036] Pressure reducing mechanism: 111 is the first buffer frame; 112 is the first ventilation pipe; 113 is the buffer pressing plate; 114 is the first branch air pipe; 115 is the first annular air distributor; 116 is the first fixing frame; 117 is the second buffer frame; 118 is the second ventilation pipe; 119 is the second branch air pipe; 1191 is the second annular air distributor; 1192 is the second fixing frame; 1193 is the first air exchange pipe; 1194 is the second air exchange pipe; 1195 is the first vacuum pump; 1196 is the second vacuum pump; 1197 is the first chamber; 1198 is the second chamber;

[0037] Exhaust mechanism: 121 is the third annular air distributor; 122 is the third branch air pipe; 123 is the air exchange container; 124 is the third ventilation pipe; 125 is the breathable membrane; 126 is the square groove; 127 is the third air exchange pipe; 128 is the third vacuum pump;

[0038] 13 is the screw. Specific implementation manner

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] Embodiment 1:

[0041] Please refer to Figure 1-8 , an extrusion device, including a frame 1, an extrusion cylinder 8 is arranged on the frame 1, and further includes a pressure reducing mechanism and an exhaust mechanism. The pressure reducing mechanism and the exhaust mechanism are arranged on the extrusion cylinder 8, and the exhaust mechanism is arranged at the side end of the pressure reducing mechanism;

[0042] The pressure reduction mechanism includes a first buffer frame 111, a buffer pressing plate 113, and a second buffer frame 117. The buffer pressing plate 113 is slidably connected to the inner side wall of the first buffer frame 111. The chambers of the first buffer frame 111 and the buffer pressing plate 113 are set as the first chamber 1197, and the chamber on the side of the buffer pressing plate 113 close to the extrusion barrel 8 is set as the second chamber 1198;

[0043] The exhaust mechanism includes an air exchange container 123, a breathable membrane 125, and a third vacuum pump 128. A plurality of square grooves 126 are formed on the extrusion barrel 8. The breathable membrane 125 is arranged in the square grooves 126, and the air exchange container 123 is arranged on the breathable membrane 125.

[0044] A driving motor 2 is arranged on the frame 1. The output end of the driving motor 2 is fixedly connected with a first coupling 3. One end of the first coupling 3 far from the driving motor 2 is fixedly connected with a speed reducer 4. The output end of the speed reducer 4 is fixedly connected with a second coupling 5.

[0045] One end of the second coupling 5 far from the speed reducer 4 is fixedly connected with a rotating shaft 6. A feed barrel 7 is arranged on the extrusion barrel 8, and three first heaters 9 are fixedly connected to the outside of the extrusion barrel 8.

[0046] A second heater 10 is fixedly connected to the outside of the extrusion barrel 8. One side of the rotating shaft 6 far from the speed reducer 4 is fixedly connected with a screw 13, and the screw 13 is arranged inside the extrusion barrel 8.

[0047] Working principle: Materials are put in from the feed barrel 7, and the driving motor 2 is started. The power is transmitted through the first coupling 3, the speed reducer 4, and the second coupling 5, so that the rotating shaft 6 rotates. The rotation of the rotating shaft 6 drives the screw 13 to rotate. The rotation of the screw 13 moves the materials towards the end far from the speed reducer 4. During the movement, the first heater 9 and the second heater 10 are started to heat the materials in the extrusion barrel 8.

[0048] In this embodiment, the third vacuum pump 128 can adopt a rotary vane vacuum pump in the prior art.

[0049] Embodiment Two:

[0050] Please refer to Figure 1-8 , on the basis of Embodiment One, this embodiment provides a technical solution for an extrusion device: The pressure reduction mechanism further includes a second air pipe 118. The second air pipe 118 is communicated with the second buffer frame 117. One end of the second air pipe 118 far from the second buffer frame 117 is communicated with a second branch air pipe 119. One end of the second branch air pipe 119 close to the speed reducer 4 is communicated with a second annular air distributor 1191.

[0051] The pressure reducing mechanism further includes a second fixing frame 1192 which is fixedly connected to the extrusion barrel 8. The second annular air distributor 1191 is fixedly connected to the second fixing frame 1192. A second air exchange pipeline 1194 is communicated with the second annular air distributor 1191. One end of the second air exchange pipeline 1194 far away from the second annular air distributor 1191 is communicated with a second vacuum pump 1196, and the second vacuum pump 1196 is arranged on the frame 1.

[0052] Four first notches and four second notches are formed on the extrusion barrel 8. The first buffer frame 111 is arranged on the first notch, and the second buffer frame 117 is arranged on the second notch. A first ventilation pipe 112 is communicated with the first buffer frame 111. One end of the first ventilation pipe 112 far away from the first buffer frame 111 is communicated with a first branch air pipe 114. One end of the first branch air pipe 114 close to the speed reducer 4 is communicated with a first annular air distributor 115. A first fixing frame 116 is fixedly connected to the extrusion barrel 8, and the first annular air distributor 115 is fixedly connected to the first fixing frame 116. A first air exchange pipeline 1193 is communicated with the first annular air distributor 115. One end of the first air exchange pipeline 1193 far away from the first annular air distributor 115 is communicated with a first vacuum pump 1195, and the first vacuum pump 1195 is arranged on the frame 1.

[0053] Working process: Start the first vacuum pump 1195. Through the rotation of the internal rotor of the first vacuum pump 1195, the first vacuum pump 1195 generates suction force, and the gas is extracted from the first chamber 1197, so that the air pressure inside the first chamber 1197 is reduced. The air flow sequentially passes through the first ventilation pipe 112, the first branch air pipe 114, the first annular air distributor 115, the first air exchange pipeline 1193 and the first vacuum pump 1195 to discharge the gas inside the first chamber 1197, so that the air pressure in the first chamber 1197 is reduced, and the buffer pressing plate 113 moves upward, thereby reducing the pressure of the machine head, improving the countercurrent phenomenon and improving the working efficiency.

[0054] After a period of time, the second vacuum pump 1196 is started, causing the second vacuum pump 1196 to generate suction, so that the air flow passes through the second ventilation pipe 118, the second branch air pipe 119, the second annular air distributor 1191, the second air exchange pipe 1194 and the second vacuum pump 1196 in sequence from the first chamber 1197 in the second buffer frame 117, reducing the air pressure in the first chamber 1197 in the second buffer frame 117. And the first vacuum pump 1195 generates an air flow that passes through the first air exchange pipe 1193, the first annular air distributor 115, the first branch air pipe 114 and the first ventilation pipe 112 in sequence, increasing the air pressure in the first chamber 1197 in the first buffer frame 111. As a result, the buffer pressing plate 113 moves downward, reducing the space in the second chamber 1198, and thus discharging the material in the second chamber 1198 into the chamber in the extrusion barrel 8. Then, through the rotation of the screw 13, the material is conveyed to the output port. The first vacuum pump 1195 and the second vacuum pump 1196 operate alternately in reverse, thereby discharging the material in the second chamber 1198 into the chamber in the extrusion barrel 8, preventing the material from staying in the second chamber 1198 for a long time, which may cause the material to accumulate at the cavity. Secondly, it avoids the material staying in the extruder for too long, being heated for a long time, resulting in over-plasticization, and thus deteriorating the material properties.

[0055] In this embodiment, the first vacuum pump 1195 and the second vacuum pump 1196 can adopt a rotary vane vacuum pump in the prior art.

[0056] Embodiment Three:

[0057] Please refer to Figure 1-8 , on the basis of Embodiment Two, this embodiment provides a technical solution for an extrusion device: a third ventilation pipe 124 is connected to the air exchange container 123, and one end of the third ventilation pipe 124 away from the air exchange container 123 is connected to a third branch air pipe 122.

[0058] One end of the third branch air pipe 122 close to the reducer 4 is connected to a third annular air distributor 121. The third annular air distributor 121 is arranged on the extrusion barrel 8. A third air exchange pipe 127 is connected to the third annular air distributor 121, and the third air exchange pipe 127 is connected to the third vacuum pump 128. The third vacuum pump 128 is arranged on the frame 1.

[0059] The material of the breathable membrane 125 is polytetrafluoroethylene.

[0060] Working process: Through the third vacuum pump 128, the inside of the air exchange container 123 is in a negative pressure state, causing the air exchange container 123 to generate suction. The gas in the chamber of the extrusion barrel 8 is discharged into the air exchange container 123 through the breathable membrane 125, reducing the pressure at the head of the machine. And by reducing the gas, problems such as bubbles and defects on the surface of the product are reduced, improving the product quality.

[0061] When the machine tool stops working, reverse-rotate the third vacuum pump 128 to generate a positive pressure inside the air exchange container 123, so that the gas passes through the breathable membrane 125, and use the gas backflush to discharge the impurities blocked on the breathable membrane 125 into the extrusion barrel 8 chamber.

[0062] Meanwhile, the content not detailed in this specification belongs to the prior art well-known to those skilled in the art.

[0063] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0064] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extrusion device, comprising a frame (1), wherein an extrusion barrel (8) is arranged on the frame (1), and it is characterized in that, It further includes a pressure relief mechanism and an exhaust mechanism. The pressure relief mechanism and the exhaust mechanism are arranged on the extrusion barrel (8), and the exhaust mechanism is arranged at the side end of the pressure relief mechanism; The pressure relief mechanism includes a first buffer frame (111), a buffer pressing plate (113) and a second buffer frame (117). The buffer pressing plate (113) is slidably connected to the inner side wall of the first buffer frame (111). The chambers of the first buffer frame (111) and the buffer pressing plate (113) are set as the first chamber (1197), and the chamber on the side of the buffer pressing plate (113) close to the extrusion barrel (8) is set as the second chamber (1198); The exhaust mechanism includes a ventilation container (123), a breathable film (125) and a third vacuum pump (128). A number of square grooves (126) are formed on the extrusion barrel (8), the breathable film (125) is arranged in the square grooves (126), and the ventilation container (123) is arranged on the breathable film (125).

2. The extrusion device according to claim 1, characterized in that: A driving motor (2) is arranged on the frame (1). The output end of the driving motor (2) is fixedly connected with a first coupling (3). One end of the first coupling (3) far from the driving motor (2) is fixedly connected with a speed reducer (4), and the output end of the speed reducer (4) is fixedly connected with a second coupling (5).

3. An extrusion device according to claim 2, characterized in that: One end of the second coupling (5) far from the speed reducer (4) is fixedly connected with a rotating shaft (6). A feed barrel (7) is arranged on the extrusion barrel (8), and three first heaters (9) are fixedly connected to the outside of the extrusion barrel (8).

4. The extrusion device according to claim 3, characterized in that: A second heater (10) is fixedly connected to the outside of the extrusion barrel (8). One side of the rotating shaft (6) far from the speed reducer (4) is fixedly connected with a screw rod (13), and the screw rod (13) is arranged inside the extrusion barrel (8).

5. The extrusion device according to claim 1, wherein: The pressure relief mechanism further includes a second ventilation pipe (118). The second ventilation pipe (118) is communicated with the second buffer frame (117). One end of the second ventilation pipe (118) far from the second buffer frame (117) is communicated with a second branch air pipe (119). One end of the second branch air pipe (119) close to the speed reducer (4) is communicated with a second annular air distributor (1191).

6. The extrusion device according to claim 5, characterized in that: The pressure relief mechanism further includes a second fixing frame (1192). The second fixing frame (1192) is fixedly connected to the extrusion barrel (8). The second annular air distributor (1191) is fixedly connected to the second fixing frame (1192). A second ventilation pipe (1194) is communicated with the second annular air distributor (1191). One end of the second ventilation pipe (1194) far from the second annular air distributor (1191) is communicated with a second vacuum pump (1196), and the second vacuum pump (1196) is arranged on the frame (1).

7. An extrusion device according to claim 6, characterized in that: Four first notches and four second notches are formed in the extrusion barrel (8). The first buffer frame (111) is arranged on the first notch, and the second buffer frame (117) is arranged on the second notch. A first ventilation pipe (112) communicates with the first buffer frame (111). One end of the first ventilation pipe (112) far from the first buffer frame (111) communicates with a first branch air duct (114). One end of the first branch air duct (114) close to the speed reducer (4) communicates with a first annular air distributor (115). A first fixing frame (116) is fixedly connected to the extrusion barrel (8), and the first annular air distributor (115) is fixedly connected to the first fixing frame (116). A first air exchange pipe (1193) communicates with the first annular air distributor (115). One end of the first air exchange pipe (1193) far from the first annular air distributor (115) communicates with a first vacuum pump (1195), and the first vacuum pump (1195) is arranged on the frame (1).

8. An extrusion device according to claim 1, characterized in that: A third ventilation pipe (124) communicates with the air exchange container (123). One end of the third ventilation pipe (124) far from the air exchange container (123) communicates with a third branch air duct (122).

9. The extrusion device according to claim 8, characterized in that: One end of the third branch air duct (122) close to the speed reducer (4) communicates with a third annular air distributor (121). The third annular air distributor (121) is arranged on the extrusion barrel (8). A third air exchange pipe (127) communicates with the third annular air distributor (121), and the third air exchange pipe (127) communicates with a third vacuum pump (128). The third vacuum pump (128) is arranged on the frame (1).

10. An extrusion device according to claim 9, characterized in that: The material of the breathable film (125) is polytetrafluoroethylene.

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