Novel automatic screen changing device for material pressure control of double screw extruder

Abstract

The utility model discloses a novel double screw extruder material pressure control automatic screen changing device, including the fixed pipe of being equipped with on the fixed pipe of extruder discharge port, and its middle part is equipped with mounting hole, still include: mounting bracket, its slidingly penetrates and is equipped in mounting hole, the top side of mounting bracket is equipped with drive mechanism, is used for driving mounting bracket reciprocating sliding, the opposite two mounting slots of being equipped with in mounting bracket, two filter plates are respectively equipped in two mounting slots, and filter plate is fixedly connected with mounting bracket through connecting mechanism. The improved double screw extruder material pressure control automatic screen changing device will not have molten material drop to the ground in the process of screen changing operation, and also will not have molten material drop to the ground after long time placing after screen removal from the device, reduces the work load of operator, and leaves more abundant time for screen replacement.

Description

Technical Field

[0001] This utility model relates to the technical field of twin-screw extruders, and in particular to a novel automatic screen changing device for controlling material pressure in a twin-screw extruder. Background Technology

[0002] A twin-screw extruder is a device specifically designed for processing and extruding various materials, especially polymers and plastics. Its structural feature consists of two parallel screws that rotate within a closed barrel, usually in opposite directions, to push and mix the material. At the outlet of a twin-screw extruder, a filter plate is typically installed to filter out impurities from the molten plastic, ensuring the quality and surface finish of the final product.

[0003] Existing twin-screw extruders typically use an electric telescopic rod to slide and misalign two filter plates to replace the installed filter plates, thus enabling quick replacement of the filter plates inside the twin-screw extruder. However, during the sliding process, the interconnected holes in the filter plates may cause the inside of the twin-screw extruder discharge port to connect with the outside, resulting in some molten material dripping onto the ground. Alternatively, after the filter plates are removed from the unit, residual molten material on the filter plates may also drip onto the ground. Due to the excessive adhesion between the molten material and the ground, it is difficult to clean, which greatly increases the workload of the operator. Utility Model Content

[0004] The purpose of this invention is to provide a novel automatic screen changing device for material pressure control in a twin-screw extruder, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a novel automatic screen changing device for material pressure control of a twin-screw extruder, comprising a fixed pipe connected to a fixed pipe installed on the discharge port of the extruder, wherein an installation hole is provided in the middle of the fixed pipe;

[0006] Also includes:

[0007] The mounting bracket is slidably installed in the mounting hole. The top side of the mounting bracket is provided with a driving mechanism for driving the mounting bracket to slide back and forth. The mounting bracket has two mounting slots that are opposite each other.

[0008] Two filter plates are respectively installed in two mounting slots, and the filter plates are fixedly connected to the mounting frame through a connecting mechanism;

[0009] Two storage shells are fixedly mounted on both sides of the fixed tube by snap-fit, and the end of the mounting bracket located outside the fixed tube is inserted into the corresponding storage shell.

[0010] Preferably, two soft rings are fixedly installed inside the wall of the fixed tube, and the side of the rings closest to the mounting bracket is in contact with the mounting bracket.

[0011] Preferably, the driving mechanism includes a motor located on the top side of the mounting bracket and fixedly connected to the outer wall of the fixing tube. A guide groove is provided on the inner top wall of the mounting hole. A threaded rod is rotatably mounted in the mounting groove, and the driving end of the motor is fixedly connected to the corresponding end of the threaded rod. A slider is threaded on the outer periphery of the threaded rod, and the bottom end of the slider is fixedly connected to the mounting bracket. The slider is in contact with the inner wall of the guide groove.

[0012] Preferably, the filter plate includes a sieve plate, a fixing ring, and a fixing plate. The fixing ring is disposed in a corresponding mounting groove and contacts the inner wall of the corresponding mounting groove. The sieve plate is fixedly installed in the corresponding fixing ring. One side of the sieve plate is coplanar with one side of the corresponding fixing ring, and the other side of the sieve plate is clearance-fitted with the other side of the corresponding fixing ring. One side of the fixing plate is fixedly connected to the side of the fixing ring away from the fixing pipe, and the upper and lower sides of the fixing plate are in contact with the inner wall of the corresponding mounting groove.

[0013] Preferably, a threaded groove is provided on the other side of the fixing plate, and a knob is threaded through the storage shell at the position corresponding to the threaded groove.

[0014] Preferably, the connecting mechanism includes several spring pieces arranged in a hemispherical shell shape, and several positioning grooves arranged in a quarter-sphere shape are equally spaced on the upper and lower sides of the fixing plate. A circular groove is opened on the inner wall of the mounting groove at the position corresponding to the positioning groove, and the spring piece is disposed in the corresponding circular groove. One end of the spring piece is fixedly connected to the inner wall of the corresponding circular groove, and the other end of the spring piece is inserted into the corresponding positioning groove and contacts the inner wall of the corresponding positioning groove.

[0015] This utility model has the following beneficial effects:

[0016] This improved twin-screw extruder material pressure control automatic screen changing device prevents molten material from dripping onto the ground during screen changing operations. Furthermore, even after the screen is removed from the device and left for an extended period, no molten material will drip onto the ground, reducing the operator's workload and allowing more time for screen replacement. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the overall structure of this utility model;

[0019] Figure 2 This is a perspective view of the internal structure of the fixed tube of this utility model;

[0020] Figure 3 This is a left view of the internal structure of the fixing tube and storage shell of this utility model;

[0021] Figure 4 This is a perspective view of the mounting frame and filter plate of this utility model after rotating 180 degrees counterclockwise.

[0022] Figure 5 This is a perspective view of the internal structure of the mounting bracket of this utility model;

[0023] Figure 6 This utility model Figure 3 Enlarged view of the mechanism at point A in the middle;

[0024] Figure 7 This utility model Figure 5 Enlarged view of the mechanism at point B.

[0025] In the diagram: 1. Fixed tube; 2. Mounting hole; 3. Mounting bracket; 4. Drive mechanism; 41. Motor; 42. Guide groove; 43. Threaded rod; 44. Slider; 5. Mounting groove; 6. Filter plate; 61. Screen plate; 62. Fixing ring; 63. Fixing plate; 64. Threaded groove; 65. Knob; 7. Connecting mechanism; 71. Positioning groove; 72. Circular groove; 73. Spring piece; 8. Storage shell; 9. Soft ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] This utility model provides a technical solution: (Refer to...) Figure 1 - Figure 7 The present invention discloses a novel automatic screen changing device for material pressure control of a twin-screw extruder, comprising a fixed pipe 1 connected to the discharge port of the extruder, wherein an installation hole 2 is provided in the middle of the pipe 1.

[0028] Also includes:

[0029] Mounting bracket 3 is slidably installed in mounting hole 2. The top side of mounting bracket 3 is provided with driving mechanism 4 for driving mounting bracket 3 to slide back and forth. There are two mounting grooves 5 opposite to each other in mounting bracket 3.

[0030] Two filter plates 6 are respectively disposed in two mounting slots 5, and the filter plates 6 are fixedly connected to the mounting frame 3 through the connecting mechanism 7;

[0031] Two storage shells 8 are fixedly mounted on both sides of the fixing tube 1 by snap fasteners, and the end of the mounting bracket 3 located outside the fixing tube 1 is inserted into the corresponding storage shell 8.

[0032] In this embodiment, when using the improved twin-screw extruder material pressure control automatic screen changing device, please refer to... Figure 1 and Figure 3 As shown, the drive mechanism 4 is activated, and the drive mounting bracket 3 slides to one side, so that the filter plate 6 located outside the fixed plate 63 is inserted into the mounting hole 2 and moved to the corresponding position in the mounting hole 2 to complete the screen replacement operation.

[0033] Please refer to Figure 3 As shown, when the filter plate 6 inside the fixed tube 1 slides out of the fixed tube 1, one end of the mounting bracket 3 and the filter plate 6 are directly inserted into the storage shell 8. (The storage shell 8 and the fixed tube 1 can be fixed by bolts, snap-fit ​​structures and elastic buckles, etc. The opening end of the storage shell 8 can also be equipped with a waterproof gasket to improve the waterproof performance of the outer wall of the fixed tube 1 and the opening end of the storage shell 8.) Since the filter plate 6 and the mounting bracket 3 slide directly into the storage shell 8, no molten material will drip onto the ground during the screen replacement process. At the same time, no molten material will drip onto the ground after the screen is removed from the device and left for a long time. This reduces the workload of the operator and allows more time for screen replacement.

[0034] When replacing the screen, please refer to... Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the storage shell 8 is removed from the fixing tube 1, and then the filter plate 6 and the storage shell 8 are removed together from the mounting frame 3. At this time, the filter plate 6 is located inside the storage shell 8 to complete the movement of the filter screen. Almost no molten material drips onto the ground, which facilitates the replacement of the filter plate 6. Then, the new filter plate 6 is inserted into the storage shell 8, and the storage shell 8 is put on the mounting frame 3. The filter plate 6 can then be pushed back into the mounting frame 3. At the same time, the connecting mechanism 7 automatically completes the fixation of the filter plate 6 and the mounting frame 3. Finally, the storage shell 8 is fixed back onto the fixing tube 1 to complete the replacement of the filter plate 6. The screen replacement operation is relatively simple.

[0035] It should be noted that the removed filter plate 6 can be reused after being cleaned.

[0036] In a further preferred embodiment of this utility model, such as Figure 2 machine Figure 3 As shown, two soft rings 9 are fixedly installed inside the wall of the fixed tube 1, and the side of the rings 9 closest to the mounting bracket 3 is in contact with the mounting bracket 3.

[0037] In this embodiment, please refer to Figure 3 machine Figure 2As shown, the soft ring 9 can seal the gap between the mounting frame 3 and the inner wall of the mounting hole 2 to prevent the molten material from flowing out from the gap between the mounting frame 3 and the mounting hole 2 during the use of the twin-screw extruder, thus affecting the use of the device.

[0038] In a further preferred embodiment of this utility model, such as Figure 3 , Figure 4 and Figure 6 As shown, the drive mechanism 4 includes a motor 41, which is located on the top side of the mounting bracket 3 and is fixedly connected to the outer wall of the fixed tube 1. A guide groove 42 is provided on the inner top wall of the mounting hole 2. A threaded rod 43 is rotatably installed in the mounting groove 5. The drive end of the motor 41 is fixedly connected to the corresponding end of the threaded rod 43. A slider 44 is threaded on the outer periphery of the threaded rod 43. The bottom end of the slider 44 is fixedly connected to the mounting bracket 3. The slider 44 is in contact with the inner wall of the guide groove 42.

[0039] In this embodiment, please refer to Figure 3 machine Figure 6 As shown, during the screen changing operation, the motor 41 starts and drives the threaded rod 43 to rotate forward or in reverse. (The motor 41 is a forward and reverse motor 41, such as a stepper motor 41 or a servo motor 41, and is controlled by the control host of the twin-screw extruder material. The start time of the motor 41 is controlled according to the internal cavity pressure of the twin-screw extruder.) Due to the mutual contact between the slider 44 and the inner wall of the guide groove 42, the rotating threaded rod 43 drives the slider 44 to move in a forward or reverse linear trajectory within the guide groove 42, thereby driving the mounting frame 3 and the filter plate 6 to move synchronously. This moves one filter plate 6 out of the fixed tube 1 and moves the filter plate 6 outside the fixed tube 1 into the fixed tube 1. The device has a high degree of automation.

[0040] In a further preferred embodiment of this utility model, such as Figure 3 - Figure 5 As shown, the filter plate 6 includes a sieve plate 61, a fixing ring 62, and a fixing plate 63. The fixing ring 62 is disposed in the corresponding mounting groove 5 and contacts the inner wall of the corresponding mounting groove 5. The sieve plate 61 is fixedly installed in the corresponding fixing ring 62. One side of the sieve plate 61 is coplanar with one side of the corresponding fixing ring 62, and the other side of the sieve plate 61 is clearance-fitted with the other side of the corresponding fixing ring 62. One side of the fixing plate 63 is fixedly connected to the side of the fixing ring 62 away from the fixing pipe 1, and the upper and lower sides of the fixing plate 63 are in contact with the inner wall of the corresponding mounting groove 5.

[0041] In this embodiment, please refer to Figure 3 - Figure 5As shown, during the filtration of molten material by the filter plate 6, the filtered impurities are stored in the fixed ring 62. As the filter plate 6 is moved out of the fixed tube 1, with the movement of the screen plate 61, the fixed ring 62 and the fixed plate 63, most of the filtered impurities and a small amount of molten material can be taken out together from the fixed tube 1, so as to avoid a large amount of filtered impurities remaining in the cavity of the twin-screw extruder and affecting the subsequent use of the filter plate 6.

[0042] In a further preferred embodiment of this utility model, such as Figure 3 and Figure 4 As shown, a threaded groove 64 is provided on the other side of the fixing plate 63, and a knob 65 is threaded through the storage shell 8 at the position corresponding to the threaded groove 64.

[0043] In this embodiment, please refer to Figure 3 and Figure 4 As shown, before disassembling the storage shell 8, the operator screws the knob 65 into the threaded groove 64 to fix the storage shell 8 to the fixing plate 63, so that when the operator disassembles the storage shell 8, the filter plate 6 can be pulled out from the mounting bracket 3 at the same time.

[0044] In a further preferred embodiment of this utility model, such as Figure 5 and Figure 7 As shown, the connecting mechanism 7 includes several spring pieces 73 arranged in a hemispherical shell shape. Several positioning grooves 71 arranged in a quarter-sphere shape are equally spaced on the upper and lower sides of the fixing plate 63. A circular groove 72 is opened on the inner wall of the mounting groove 5 at the position corresponding to the positioning groove 71. The spring pieces 73 are placed in the corresponding circular grooves 72. One end of the spring piece 73 is fixedly connected to the inner wall of the circular groove 72, and the other end of the spring piece 73 is inserted into the corresponding positioning groove 71 and contacts the inner wall of the corresponding positioning groove 71.

[0045] In this embodiment, please refer to Figure 5 and Figure 7 As shown, when disassembling the storage shell 8, due to the mutual contact between the outer arc wall of the spring piece 73 and the inner arc wall of the positioning groove 71, the spring piece 73 can be pressed into the circular groove 72 by the deformation of the spring piece 73 along the outer arc wall of the spring piece 73, thereby automatically releasing the connection and fixing state between the fixing plate 63 and the mounting frame 3, so that the filter plate 6 can be directly pulled out from the mounting frame 3.

[0046] After the new filter plate 6 is inserted into the mounting bracket 3, the positioning groove 71 is realigned with the spring piece 73. As the spring piece 73 deforms, part of the spring piece 73 is automatically inserted into the positioning groove 71. At this time, due to the mutual contact between the spring piece 73 and the inner wall of the positioning groove 71, a constraint force can be applied between the fixing plate 63 and the mounting bracket 3, so that the filter plate 6 can be stably installed in the mounting bracket 3 without large external forces. No other operation is required from the operator, and the replacement operation of the filter plate 6 is simple.

[0047] Working principle: During the operation of this improved twin-screw extruder, as the sieve plate 61 filters the molten material, almost all the impurities in the molten material are trapped in the fixed ring 62. When the internal pressure of the twin-screw extruder is too high due to the blockage of the holes in the sieve plate 61 by impurities, the material pressure control automatic screen changing device will replace the filter plate 6. The motor 41 starts to drive the threaded rod 43 to rotate forward or in reverse. Due to the mutual contact between the slider 44 and the inner wall of the guide groove 42, the rotating threaded rod 43 drives the slider 44 to move in a forward or reverse linear trajectory within the guide groove 42, thereby pushing the filter plate 6 in the fixed tube 1 out of the fixed tube 1 and pushing the filter plate 6 outside the fixed tube 1 into the corresponding position inside the fixed tube 1 to complete the replacement operation of the filter plate 6.

[0048] When the filter plate 6 in the fixed tube 1 slides out of the fixed tube 1, one end of the mounting bracket 3 and the filter plate 6 are directly inserted into the storage shell 8. Since the filter plate 6 and the mounting bracket 3 slide directly into the storage shell 8, the molten material flows directly into the storage shell 8 during the screen changing process, and no molten material drips onto the ground.

[0049] It should be noted that the molten material located inside the storage shell 8 is located outside the inner cavity of the twin-screw extruder. Over time, it gradually becomes more viscous, thus allowing the material to adhere firmly to the filter plate 6.

[0050] When replacing filter plate 6, first turn knob 65 into threaded groove 64 to fix storage shell 8 and fixing plate 63 together. Then, release storage shell 8 from fixing tube 1 and remove storage shell 8 from mounting bracket 3. Due to the fixing of fixing plate 63 and storage shell 8, filter plate 6 can be pulled out from mounting bracket 3 together. After disassembling storage shell 8, by moving storage shell 8, filter plate 6 and internal material can be moved to a suitable position. Then, turn knob 65 out from fixing plate 63 to release the fixing of filter plate 6 and storage shell 8, so that filter plate 6 can be directly taken out from storage shell 8.

[0051] It should be noted that when the filter plate 6 is pulled out from the mounting bracket 3, due to the mutual abutment between the outer arc wall of the spring piece 73 and the inner arc wall of the positioning groove 71, the spring piece 73 can be pressed into the circular groove 72 by the deformation of the spring piece 73 along the outer arc wall of the spring piece 73, thereby automatically releasing the connection and fixing state between the fixing plate 63 and the mounting bracket 3.

[0052] After removing filter plate 6 from storage shell 8, insert the new filter plate 6 into storage shell 8. Due to the mutual abutment between the fixing block and the inner wall of storage shell 8, filter plate 6 remains in the corresponding position within storage shell 8. Then, re-attach storage shell 8 to mounting bracket 3, allowing the new filter plate 6 to be directly pushed into mounting bracket 3. Furthermore, due to the mutual abutment between the outer arc wall of fixing ring 62 and the outer arc wall of spring piece 73, spring piece 73 can be directly pressed into the round hole along its outer arc wall without affecting the insertion of filter plate 6 into mounting bracket 3. After the fixed tube 1 contacts, the filter plate 6 moves synchronously to the corresponding position in the mounting frame 3. At this time, the positioning groove 71 is re-aligned with the spring piece 73. As the spring piece 73 deforms, part of the spring piece 73 is automatically inserted into the positioning groove 71. At this time, due to the mutual contact between the spring piece 73 and the inner wall of the positioning groove 71, a constraint force can be applied between the fixed plate 63 and the mounting frame 3, so that the filter plate 6 can be stably installed in the mounting frame 3 without being subjected to large external forces. Finally, the storage shell 8 and the fixed tube 1 are fixed again, and the disassembly and replacement of the filter plate 6 is completed.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel automatic screen changing device for material pressure control in a twin-screw extruder, comprising a fixed pipe (1) connected to the discharge port of the extruder, characterized in that, The fixing tube (1) has an installation hole (2) in the middle. Also includes: Mounting bracket (3) is slidably installed in mounting hole (2). The top side of mounting bracket (3) is provided with driving mechanism (4) for driving mounting bracket (3) to slide back and forth. Two mounting slots (5) are opened opposite each other in mounting bracket (3). Two filter plates (6) are respectively installed in two mounting slots (5), and the filter plates (6) are fixedly connected to the mounting frame (3) through the connecting mechanism (7); Two storage shells (8) are fixedly mounted on both sides of the fixing tube (1) by means of a snap fastener, and the end of the mounting bracket (3) located outside the fixing tube (1) is inserted into the corresponding storage shell (8).

2. The novel automatic screen changing device for material pressure control in a twin-screw extruder according to claim 1, characterized in that: Two soft rings (9) are fixedly installed inside the wall of the fixed tube (1), and the side of the fixed tube (1) near the mounting bracket (3) is in contact with the mounting bracket (3).

3. The novel automatic screen changing device for material pressure control in a twin-screw extruder according to claim 2, characterized in that: The drive mechanism (4) includes a motor (41), which is located on the top side of the mounting bracket (3) and fixedly connected to the outer wall of the fixed tube (1). A guide groove (42) is provided on the inner top wall of the mounting hole (2). A threaded rod (43) is rotatably installed in the mounting groove (5), and the drive end of the motor (41) is fixedly connected to the corresponding end of the threaded rod (43). A slider (44) is threaded on the outer periphery of the threaded rod (43), and the bottom end of the slider (44) is fixedly connected to the mounting bracket (3). The slider (44) is in contact with the inner wall of the guide groove (42).

4. The novel automatic screen changing device for material pressure control in a twin-screw extruder according to claim 3, characterized in that: The filter plate (6) includes a sieve plate (61), a fixing ring (62) and a fixing plate (63). The fixing ring (62) is located in the corresponding mounting groove (5) and is in contact with the inner wall of the corresponding mounting groove (5). The sieve plate (61) is fixedly installed in the corresponding fixing ring (62). One side of the sieve plate (61) is coplanar with one side of the corresponding fixing ring (62), and the other side of the sieve plate (61) is clearance-fitted with the other side of the corresponding fixing ring (62). One side of the fixing plate (63) is fixedly connected to the side of the fixing ring (62) away from the fixing pipe (1), and the upper and lower sides of the fixing plate (63) are in contact with the inner wall of the corresponding mounting groove (5).

5. The novel automatic screen changing device for material pressure control in a twin-screw extruder according to claim 4, characterized in that: A threaded groove (64) is provided on the other side of the fixing plate (63), and a knob (65) is threaded through the storage shell (8) at the position corresponding to the threaded groove (64).

6. The novel automatic screen changing device for material pressure control in a twin-screw extruder according to claim 5, characterized in that: The connecting mechanism (7) includes several spring pieces (73) arranged in a hemispherical shell shape. Several positioning grooves (71) arranged in a quarter-sphere shape are equally spaced on the upper and lower sides of the fixing plate (63). A circular groove (72) is opened on the inner wall of the mounting groove (5) at the position corresponding to the positioning groove (71). The spring piece (73) is located in the corresponding circular groove (72). One end of the spring piece (73) is fixedly connected to the inner wall of the corresponding circular groove (72), and the other end of the spring piece (73) is inserted into the corresponding positioning groove (71) and contacts the inner wall of the corresponding positioning groove (71).

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