Pressure regulation and control device of double-screw extruder

Abstract

The utility model relates to the technical field of extruders, and discloses a double-screw extruder pressure regulation and control device which comprises a base, the top of the base is fixedly connected with an extrusion cylinder, the left side of the top of the extrusion cylinder is communicated with a discharging pipe, the top of the discharging pipe is communicated with a storage barrel, the outer side of the discharging pipe is fixedly connected with a hollow block, and the hollow block is fixedly connected with a screw rod. The device comprises a hollow block, a motor is fixedly connected to the bottom of the hollow block, the top of the motor penetrates through the hollow block and is fixedly connected with a horizontal gear, sliding blocks are arranged on the front side and the rear side of the inner bottom end of the hollow block, racks are fixedly connected to the adjacent sides of the two sliding blocks, and the two racks are connected with the left side and the right side of the horizontal gear in an engaged mode respectively. According to the utility model, the hollow pipe and the rotating rod can drive the first valve body and the second valve body to rotate, and the descending speed of materials can be controlled by adjusting the opening and closing angles of the first valve body and the second valve body, so that the pressure in the extrusion cylinder is adjusted.

Description

A pressure regulating device for a twin-screw extruder Technical Field

[0001] This utility model relates to the field of extruder technology, and in particular to a pressure regulating device for a twin-screw extruder. Background Technology

[0002] As a key piece of equipment in the plastics processing field, the extruder plays an irreplaceable role in industrial production. During operation, the material enters the extrusion cylinder from the hopper, and the screw mixes and stirs the material to ensure that its components and temperature are evenly distributed. Then, under a certain pressure, the material is extruded through a die of a specific shape at the die head to obtain the desired product.

[0003] With the development of materials science, various new polymer materials are constantly emerging. Different materials have very different rheological properties and processing characteristics. Different pressure conditions are required during the extrusion process to achieve good plasticization and molding. However, traditional extruders cannot meet the processing needs of different materials. Therefore, an extruder pressure control device is needed.

[0004] Currently, extruders on the market mainly consist of a screw, extrusion cylinder, driver, and heater. During operation, the driver rotates the screw to extrude the material. The heater heats the extrusion cylinder, ensuring smooth material extrusion. However, this device relies solely on screw rotation to propel the material forward, resulting in a relatively simple flow pattern and poor mixing within the extrusion cylinder. To address these issues, existing technologies utilize twin-screw extrusion to improve mixing precision and product quality. However, in practical use, the significant differences in physical properties between different materials lead to substantial pressure variations within the device, making it inconvenient for processing diverse materials and reducing its practicality, thus failing to meet user needs. Summary of the Invention

[0005] To overcome the above shortcomings, this utility model provides a pressure regulating device for a twin-screw extruder, which aims to improve the problem of large pressure differences inside the device when using different materials in the existing twin-screw extruder.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a pressure regulating device for a twin-screw extruder, comprising a base, an extrusion cylinder fixedly connected to the top of the base, a feed pipe connected to the top left side of the extrusion cylinder, a storage tank connected to the top of the feed pipe, a hollow block fixedly connected to the outside of the feed pipe, a motor fixedly connected to the bottom of the hollow block, a flat gear fixedly connected to the top of the motor passing through the hollow block, and sliders provided on both the front and rear sides of the bottom of the hollow block, with racks fixedly connected to adjacent sides of the two sliders, and the two racks respectively connected to the left and right sides of the flat gear. The two sliders are rotatably connected to each other. A rotating rod is rotatably connected to the left end of the hollow block, and a hollow tube is rotatably connected to the right end of the hollow block. Push plates are fixedly connected to the left side of the outer walls of the hollow tube and the rotating rod. Connecting seats are fixedly connected to the opposite sides of the two push plates. The inner sides of the two connecting seats are rotatably connected to the corresponding connecting rods. A control component is provided inside the feeding tube. An extrusion component is provided inside the extrusion cylinder. A disassembly mechanism is provided on the right side of the extrusion cylinder. The disassembly mechanism is used to facilitate the disassembly and replacement of the extrusion head of the device.

[0007] As a further description of the above technical solution:

[0008] The disassembly mechanism includes a hollow plate. Movable plates are provided on both the upper and lower sides of the hollow plate. A locking block is fixedly connected to an adjacent side of each of the two movable plates. A common extrusion mold is provided on an adjacent side of each of the two locking blocks. The extrusion mold has slots at both its upper and lower ends. The two locking blocks engage with their corresponding slots. A knob is rotatably connected to the front side of the hollow plate. A support block is fixedly connected to the rear end of the knob, which passes through the hollow plate. Connecting plates are rotatably connected to the upper and lower sides of the support block. Support seats are fixedly connected to the front ends of the opposite sides of the movable plates. The inner sides of the two support seats are rotatably connected to their corresponding connecting plates. A reset assembly is provided on the inner side of the hollow plate.

[0009] As a further description of the above technical solution:

[0010] The control component includes a first valve body, which is disposed inside the left side of the feed tube. The right end of the hollow tube passes through the feed tube and is fixedly connected to the first valve body. The right end of the rotating rod passes through the hollow tube and is fixedly connected to a second valve body.

[0011] As a further description of the above technical solution:

[0012] The extrusion assembly includes transmission rods, two of which are rotatably connected to the front and rear sides of the right wall of the extrusion cylinder, respectively. A motor is fixedly connected to the top left side of the base, and the output end of the motor is fixedly connected to the front transmission rod. Transmission gears are fixedly connected to the left ends of both transmission rods, and the two transmission gears are meshed together. Extrusion screws are fixedly connected to the right ends of both transmission rods through the extrusion cylinder.

[0013] As a further description of the above technical solution:

[0014] The reset assembly includes a fixing rod, and multiple fixing rods are respectively fixedly connected to the upper and lower ends of the front and rear sides inside the hollow plate. Springs are fixedly connected to the outer sides of the multiple fixing rods, and one end of each fixing rod passes through the corresponding movable plate and is fixedly connected to a limit block.

[0015] As a further description of the above technical solution:

[0016] The top of the storage tank is connected to a feed inlet, and the top of the feed inlet is threaded with a feed cover. Heating rods are fixedly connected to the outer perimeter of the extrusion cylinder.

[0017] As a further description of the above technical solution:

[0018] The hollow block has grooves on both the left and right sides of its bottom interior, and the bottoms of the two sliders are slidably connected to the corresponding grooves.

[0019] As a further description of the above technical solution:

[0020] Mounting plates are fixedly connected to the four corners of the bottom of the base, and holes are opened on the top of the mounting plates.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the motor drives the flat gear to rotate, and the racks on both sides drive the slider to move towards the center. The slider pushes the connecting seat to move through the connecting rod. At this time, the two push plates will push the hollow tube and the rotating rod to rotate in opposite directions. The hollow tube and the rotating rod will then drive the first valve body and the second valve body to rotate. By adjusting the opening and closing angle of the first valve body and the second valve body, the descent speed of the material can be controlled, thereby adjusting the pressure inside the extrusion cylinder. This improves the practicality of the device and can meet the needs of users.

[0023] 2. In this utility model, the knob drives the support block to rotate. When the support block rotates, it can push the support seat to move through the connecting plate. The movement of the movable plate will drive the locking block to move, thereby disengaging it from the slot. This makes it easy to disassemble the extrusion mold and facilitates the disassembly and replacement of the extrusion mold, reducing the workload of the staff. Attached Figure Description

[0024] Figure 1 is a perspective view of a pressure regulating device for a twin-screw extruder proposed in this utility model;

[0025] Figure 2 is a cross-sectional view of the hollow block structure of a pressure regulating device for a twin-screw extruder proposed in this utility model;

[0026] Figure 3 is a partial structural cross-sectional view of a pressure regulating device for a twin-screw extruder proposed in this utility model;

[0027] Figure 4 is a cross-sectional view of the extrusion cylinder structure of a twin-screw extruder pressure control device proposed in this utility model;

[0028] Figure 5 is a cross-sectional view of the hollow plate structure of a pressure regulating device for a twin-screw extruder proposed in this utility model.

[0029] Figure 6 is a partial structural disassembly diagram of a pressure regulating device for a twin-screw extruder proposed in this utility model.

[0030] Legend:

[0031] 1. Base; 2. Disassembly mechanism; 201. Hollow plate; 202. Movable plate; 203. Locking block; 204. Extrusion die; 205. Slot; 206. Knob; 207. Support block; 208. Connecting plate; 209. Support seat; 210. Fixing rod; 211. Spring; 212. Limiting block; 3. Extrusion cylinder; 4. Feed tube; 5. Storage tank; 6. Hollow block; 7. Motor; 8. Flat gear; 9. Slider; 10. Rack; 11. Connecting rod; 12. Rotating rod; 13. Hollow tube; 14. Push plate; 15. Connecting seat; 16. First valve body; 17. Second valve body; 18. Motor; 19. Transmission gear; 20. Extrusion screw; 21. Feed port; 22. Feed cover; 23. Mounting piece; 24. Hole; 25. Heating rod; 26. Slide groove; 27. Transmission rod. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Referring to Figures 2, 3, and 4, one embodiment of this utility model provides a pressure regulating device for a twin-screw extruder, comprising a base 1, an extrusion cylinder 3 fixedly connected to the top of the base 1, a feed pipe 4 connected to the top left side of the extrusion cylinder 3, a storage tank 5 connected to the top of the feed pipe 4, the storage tank 5 being used to hold raw materials, a hollow block 6 fixedly connected to the outside of the feed pipe 4, a motor 7 fixedly connected to the bottom of the hollow block 6, a spur gear 8 fixedly connected to the top of the motor 7 passing through the hollow block 6, the motor 7 driving the spur gear 8 to rotate, and sliders 9 being provided on both the front and rear sides of the bottom of the hollow block 6, with each adjacent side of the two sliders 9 fixedly connected to a... Racks 10 drive sliders 9 to move. The two racks 10 are respectively connected to the left and right sides of the spur gear 8. When the spur gear 8 rotates, the two racks 10 move accordingly. Connecting rods 11 are rotatably connected to the top of each slider 9. A rotating rod 12 is rotatably connected to the left end of the hollow block 6, and a hollow tube 13 is rotatably connected to the right end of the hollow block 6. Push plates 14 are fixedly connected to the left side of the outer walls of both the hollow tube 13 and the rotating rod 12. The two push plates 14 drive the hollow tube 13 and the rotating rod 12 to rotate respectively. Connecting seats 15 are fixedly connected to the opposite sides of the two push plates 14. The inner sides of the two connecting seats 15 are respectively... The connecting rod 11 is rotatably connected to the corresponding connecting rod 9. When the slider 9 moves, the connecting rod 11 can push the connecting seat 15 to move. A control component is provided inside the feeding tube 4, and an extrusion component is provided inside the extrusion cylinder 3. A disassembly mechanism 2 is provided on the right side of the extrusion cylinder 3. The disassembly mechanism 2 is used to facilitate the disassembly and replacement of the extrusion head of the device. The control component includes a first valve body 16, which is located on the left side inside the feeding tube 4. The right end of the hollow tube 13 passes through the feeding tube 4 and is fixedly connected to the first valve body 16. The right end of the rotating rod 12 passes through the hollow tube 13 and is fixedly connected to a second valve body 17. The hollow tube 13 and the rotating rod 12 can be respectively... The first valve body 16 and the second valve body 17 are driven to rotate. The extrusion assembly includes a transmission rod 27. The two transmission rods 27 are rotatably connected to the front and rear sides of the right wall of the extrusion cylinder 3, respectively. A motor 18 is fixedly connected to the top left side of the base 1. The output end of the motor 18 is fixedly connected to the front transmission rod 27. The motor 18 can drive the front transmission rod 27 to rotate. The left ends of the two transmission rods 27 are fixedly connected to transmission gears 19. The two transmission gears 19 are meshed and connected. The front transmission rod 27 can drive the rear transmission rod 27 to rotate through the transmission action of the transmission gears 19. The right ends of the two transmission rods 27 pass through the extrusion cylinder 3 and are fixedly connected to the extrusion screw 20.

[0034] Specifically, when using this device, if it is necessary to adjust the pressure inside the extrusion cylinder 3, the motor 7 is started. The motor 7 drives the spur gear 8 to rotate. Since the two racks 10 mesh with the two sides of the spur gear 8, when the spur gear 8 rotates, the two racks 10 will move accordingly and drive the sliders 9 on both sides to move. During the movement of the sliders 9, the connecting rod 11 can pull the connecting seat 15 to move. The two moving connecting seats 15 are connected by the push plate 14, which can drive the hollow tube 13 and the rotating rod 12 to rotate. The hollow tube 13 and the rotating rod 12 rotate in opposite directions. The hollow tube 13 and the rotating rod 12 will then drive the first valve body 16 and the second valve body 17 to rotate respectively. By adjusting the opening and closing angle of the first valve body 16 and the second valve body 17, the descent speed of the material can be controlled, thereby enabling precise adjustment of the pressure inside the extrusion cylinder 3. This improves the practicality of the device and can meet the needs of users.

[0035] Referring to Figures 1, 5, and 6, the disassembly mechanism 2 includes a hollow plate 201. Movable plates 202 are provided on both the upper and lower sides of the hollow plate 201. A locking block 203 is fixedly connected to each adjacent side of the two movable plates 202. The movable plates 202 drive the locking blocks 203 to move. A common extrusion mold 204 is provided on each adjacent side of the two locking blocks 203. The extrusion mold 204 has slots 205 at both its upper and lower ends. The two locking blocks 203 engage with their corresponding slots 205, thus securing the extrusion mold 204 firmly. A knob 206 is rotatably connected to the front side of the hollow plate 201. The rear end of the knob 206 passes through the hollow plate 201 and is fixedly connected to a support block 207. The knob 206 drives the support block 207 to rotate. The upper and lower sides are rotatably connected to connecting plates 208. The front ends of the opposite sides of the movable plate 202 are fixedly connected to support seats 209. The inner sides of the two support seats 209 are rotatably connected to the corresponding connecting plates 208. The support block 207 can pull the support seat 209 to move through the connecting plates 208. The inner side of the hollow plate 201 is provided with a reset assembly. The reset assembly includes a fixing rod 210. Multiple fixing rods 210 are fixedly connected to the upper and lower ends of the front and rear sides of the hollow plate 201. The outer sides of the multiple fixing rods 210 are fixedly connected to springs 211. The springs 211 can push the locking block 203 to engage with the locking groove 205. One end of the multiple fixing rods 210 passes through the corresponding movable plate 202 and is fixedly connected to a limit block 212. The limit block 212 can control the position of the movable plate 202.

[0036] Specifically, when using this device to process different materials and needing to change different extrusion dies 204, turning the knob 206 will cause the support block 207 to rotate. During the rotation of the support block 207, the support base 209 can be moved through the connecting plate 208 connected to it. The support base 209 will further drive the movable plate 202 to move. During the movement of the movable plate 202, the locking block 203 will disengage from the slot 205, making the disassembly of the extrusion die 204 very convenient. When it is necessary to reinstall the extrusion die 204, the extrusion die 204 is pushed into the hollow plate 201. At this time, the spring 211 will push the locking block 203 to re-engage with the slot 205, thereby ensuring that the extrusion die 204 is firmly fixed, reducing the workload of the workers.

[0037] Referring to Figure 1, the top of the storage tank 5 is connected to the inlet 21, and the top of the inlet 21 is threadedly connected to the inlet cover 22. By opening the inlet cover 22, raw materials can be conveniently added to the storage tank 5. Heating rods 25 are fixedly connected to the outer periphery of the extrusion cylinder 3.

[0038] Specifically, when the staff opens the feed cover 22, they can add the raw material of the device into the storage tank 5 through the feed port 21. The heating rod 25 can increase the temperature inside the extrusion cylinder 3, so that the raw material can be extruded more smoothly.

[0039] Referring to Figures 1 and 3, the hollow block 6 has a sliding groove 26 on both the left and right sides of its bottom. The bottom of the two sliders 9 are slidably connected to the corresponding sliding groove 26. The sliding groove 26 can limit the movement of the sliders 9. The four corners of the bottom of the base 1 are fixedly connected to the mounting plate 23. The top of the mounting plate 23 has a hole 24. The device can be fixed by using bolts inside the hole 24.

[0040] Specifically, the slider 9 can only slide inside the groove 26, allowing the slider 9 to move smoothly, and the mounting plate 23 can be fixed inside the hole 24 with bolts, thereby securing the device firmly.

[0041] Working principle: When using this device, when it is necessary to adjust the pressure inside the extrusion cylinder 3, start the motor 7. The motor 7 will drive the spur gear 8 to rotate. Since the two racks 10 mesh with the two sides of the spur gear 8 respectively, when the spur gear 8 rotates, the racks 10 on both sides will drive the slider 9 to move towards the middle. When the slider 9 moves, it can push the connecting seat 15 to move through the connecting rod 11. At this time, the two connecting seats 15 can push the hollow tube 13 and the rotating rod 12 to rotate respectively through the push plate 14. The hollow tube 13 and the rotating rod 12 rotate in opposite directions. The hollow tube 13 and the rotating rod 12 can drive the first valve body 16 and the second valve body 17 to rotate. By adjusting the opening and closing angle of the first valve body 16 and the second valve body 17, the descent speed of the material can be controlled, thereby adjusting the pressure inside the extrusion cylinder 3.

[0042] Furthermore, when using this device to process different materials and needing to change different extrusion dies 204, turning the knob 206 will cause the support block 207 to rotate. When the support block 207 rotates, it can push the support base 209 to move through the connecting plate 208. The support base 209 will drive the movable plate 202 to move. When the movable plate 202 moves, it can drive the locking block 203 to move, thereby disengaging it from the slot 205. This allows the extrusion die 204 to be easily disassembled. When it is necessary to install the extrusion die 204, push the extrusion die 204 into the hollow plate 201. The spring 211 will push the locking block 203 to engage with the slot 205, thus fixing the extrusion die 204.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure regulating device for a twin-screw extruder comprising a base (1), characterized in that: An extrusion cylinder (3) is fixedly connected to the top of the base (1). A feeding pipe (4) is connected to the top left side of the extrusion cylinder (3). A storage tank (5) is connected to the top of the feeding pipe (4). A hollow block (6) is fixedly connected to the outside of the feeding pipe (4). A motor (7) is fixedly connected to the bottom of the hollow block (6). A spur gear (8) is fixedly connected to the top of the motor (7) through the hollow block (6). Sliders (9) are provided on the front and rear sides of the bottom of the hollow block (6). A rack (10) is fixedly connected to the adjacent side of the two slides (9). The two racks (10) are respectively meshed with the left and right sides of the spur gear (8). A connecting rod is rotatably connected to the top of the two slides (9). The hollow block (6) is rotatably connected to the left end of the rod (11), and the hollow tube (13) is rotatably connected to the right end of the hollow block (6). Push plates (14) are fixedly connected to the left side of the outer wall of the hollow tube (13) and the rotating rod (12). Connecting seats (15) are fixedly connected to the opposite sides of the two push plates (14). The inner sides of the two connecting seats (15) are rotatably connected to the corresponding connecting rods (11). A control component is provided on the inner side of the feeding tube (4). An extrusion component is provided inside the extrusion cylinder (3). A disassembly mechanism (2) is provided on the right side of the extrusion cylinder (3). The disassembly mechanism (2) is used to facilitate the disassembly and replacement of the extrusion head of the device.

2. A pressure regulating device for a twin screw extruder according to claim 1, characterized in that: The disassembly mechanism (2) includes a hollow plate (201). Movable plates (202) are provided on both the upper and lower sides of the hollow plate (201). A locking block (203) is fixedly connected to each adjacent side of the two movable plates (202). A common extrusion mold (204) is provided on each adjacent side of the two locking blocks (203). A slot (205) is provided at both the upper and lower ends of the extrusion mold (204). The two locking blocks (203) engage with their respective slots (205). The hollow plate (201) A knob (206) is rotatably connected to the front side of the hollow plate (201). The rear end of the knob (206) passes through the hollow plate (201) and is fixedly connected to a support block (207). The upper and lower sides of the support block (207) are rotatably connected to connecting plates (208). The front ends of the opposite sides of the movable plate (202) are fixedly connected to support seats (209). The inner sides of the two support seats (209) are rotatably connected to the corresponding connecting plates (208). A reset component is provided on the inner side of the hollow plate (201).

3. A pressure regulating device for a twin screw extruder as claimed in claim 1, wherein: The control component includes a first valve body (16), which is located on the left side inside the feed pipe (4). The right end of the hollow tube (13) passes through the feed pipe (4) and is fixedly connected to the first valve body (16). The right end of the rotating rod (12) passes through the hollow tube (13) and is fixedly connected to a second valve body (17).

4. A pressure regulating device for a twin screw extruder as defined in claim 1, characterized in that: The extrusion assembly includes a transmission rod (27), two transmission rods (27) are rotatably connected to the front and rear sides of the right wall of the extrusion cylinder (3), a motor (18) is fixedly connected to the top left side of the base (1), the output end of the motor (18) is fixedly connected to the front transmission rod (27), the left ends of the two transmission rods (27) are fixedly connected to a transmission gear (19), the two transmission gears (19) are meshed, and the right ends of the two transmission rods (27) pass through the extrusion cylinder (3) and are fixedly connected to an extrusion screw (20).

5. The pressure regulating device for a twin-screw extruder according to claim 2, characterized in that: The reset assembly includes a fixing rod (210), and multiple fixing rods (210) are respectively fixedly connected to the upper and lower ends of the front and rear sides of the hollow plate (201). A spring (211) is fixedly connected to the outer side of each of the multiple fixing rods (210). One end of each of the multiple fixing rods (210) passes through the corresponding movable plate (202) and is fixedly connected to a limit block (212).

6. A pressure regulating device for a twin screw extruder as defined in claim 1, characterized in that: The top of the storage tank (5) is connected to the inlet (21), and the top of the inlet (21) is threadedly connected to the inlet cover (22). Heating rods (25) are fixedly connected to the outer periphery of the extrusion cylinder (3).

7. The pressure regulating device for a twin-screw extruder according to claim 1, characterized in that: The hollow block (6) has grooves (26) on both the left and right sides of its bottom. The bottoms of the two sliders (9) are slidably connected to the corresponding grooves (26).

8. The pressure regulating device for a twin-screw extruder according to claim 1, characterized in that: Mounting plates (23) are fixedly connected to the four corners of the bottom of the base (1), and holes (24) are opened on the top of the mounting plates (23).

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