Negative-pressure anti-blocking device and extruder

Abstract

The utility model provides a negative pressure anti-clogging device and extruder, negative pressure anti-clogging device is used for installing on the vent hole of extruder, including connecting piece, negative pressure subassembly and swaging subassembly, connecting piece has the cavity inside, and is provided with the intercommunication hole of one-to-one correspondence with the vent hole; the negative pressure assembly is arranged on one side of the connecting piece, communicates with the cavity and is used for communicating with the exhaust hole and conducting negative pressure exhaust. The material pressing assembly comprises a telescopic mechanism and a material pressing piece, the telescopic mechanism is installed on the connecting piece, and the telescopic end of the telescopic mechanism penetrates into the cavity and is connected with the material pressing piece. According to the negative-pressure anti-blocking device provided by the utility model, the negative-pressure assembly and the material pressing assembly are arranged at the position of the exhaust hole of the extruder through the connecting piece, the negative-pressure assembly is used for extracting negative-pressure exhaust and promoting gas discharge, and the material pressing piece is telescopically pushed under the driving of the telescopic mechanism so as to form material pushing to the exhaust hole; the vent hole blockage caused by molten material hanging on the wall is avoided.

Description

Technical Field

[0001] This utility model relates to the field of extruder exhaust technology, specifically to a negative pressure anti-clogging device and an extruder. Background Technology

[0002] During pipe extrusion production, a large amount of air and volatile gases are mixed into the hot-melt raw materials (such as PVC and PE) during screw shearing and melting. If these gases are not discharged in time, residual gases will form bubbles, voids, or surface ripple defects inside the formed pipe, seriously affecting the pipe's mechanical strength, sealing performance, and appearance quality. Traditional pipe extruders mostly rely on natural venting or simple open-hole venting, lacking active venting devices, resulting in low venting efficiency, especially under high-viscosity materials or high-speed extrusion conditions, where gases are difficult to effectively expel.

[0003] To improve exhaust efficiency, some technical solutions attempt to install a vacuum pump in the exhaust section of the extruder, forcibly drawing in gas through negative pressure. For example, Chinese Patent 202222799910.3 discloses a vacuum exhaust device for a parallel twin-screw extruder. However, such designs have the following problems in practical applications:

[0004] Molten material tends to adhere to the wall, causing blockage of the vent holes. During negative pressure suction, molten material tends to stick and accumulate at the vent holes, gradually blocking the venting channels and causing vacuum failure. This necessitates frequent shutdowns for cleaning, reducing production efficiency. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a negative pressure anti-clogging device to solve the technical problem that molten material easily adheres to the wall and causes blockage of the vent hole in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this utility model provides a negative pressure anti-clogging device for installation on the exhaust port of an extruder, comprising:

[0008] The connector has an internal cavity and is provided with connecting holes that correspond one-to-one with the exhaust holes;

[0009] A negative pressure assembly, disposed on one side of the connector and communicating with the cavity, is used to connect to an exhaust port and draw negative pressure exhaust; and

[0010] The pressing assembly includes a telescopic mechanism and a pressing component. The telescopic mechanism is mounted on the connector, and its telescopic end extends into the cavity and is connected to the pressing component to drive the pressing component to slide and push material along the inner wall of the vent hole.

[0011] In some embodiments, the negative pressure assembly includes an air extraction pipeline and a vacuum pump, wherein the air extraction end of the vacuum pump is connected to one end of the air extraction pipeline, and the other end of the air extraction pipeline is connected to the connector and communicates with the cavity.

[0012] In some embodiments, the pressing component includes a frame and a piston. The frame is connected to the telescopic end of the telescopic mechanism. The number of pistons corresponds one-to-one with the number of vent holes. The piston is mounted on the bottom of the frame via a connecting rod, and a hollow hole is provided at the top of the piston along the axial direction.

[0013] In some embodiments, a protective cylinder is connected between the telescopic mechanism and the connector. The protective cylinder is installed on the top of the connector, and the telescopic end of the telescopic mechanism passes through the protective cylinder and is connected to the frame.

[0014] In some embodiments, the frame has guide rod assemblies corresponding to the pistons, and the top of the connector has through holes corresponding to the guide rod assemblies. The guide rod assemblies are slidably connected to the corresponding through holes.

[0015] In some embodiments, the inner top wall of the cavity is provided with an intermediate block that corresponds one-to-one with the piston axis, and the outer diameter of the intermediate block matches the inner diameter of the hollow hole.

[0016] In some embodiments, the intermediate block has a built-in first heating element for heating the intermediate block.

[0017] In some embodiments, a second heating element is provided on the inner side of the piston for heating the piston.

[0018] In some embodiments, the connector includes a lower housing and an upper housing, the upper housing being detachably connected to the lower housing, and the communicating hole being formed at the bottom of the lower housing.

[0019] Secondly, this utility model also provides an extruder, including the negative pressure anti-clogging device as described in any of the above.

[0020] Compared with the prior art, the negative pressure anti-clogging device provided by this utility model installs the negative pressure component and the pressing component at the exhaust port of the extruder through the connecting parts. The negative pressure component draws negative pressure to exhaust the gas, promoting the gas discharge. Under the drive of the telescopic mechanism, the telescopic component pushes the pressing component to form a material push against the exhaust port, avoiding the molten material from sticking to the wall and causing the exhaust port to be blocked. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the negative pressure anti-clogging device provided in this embodiment of the utility model;

[0022] Figure 2This is a schematic diagram showing the position of the negative pressure anti-clogging device and the exhaust port provided in this embodiment of the utility model;

[0023] Figure 3 This is a three-dimensional exploded view of the negative pressure anti-clogging device provided in this embodiment of the utility model;

[0024] Figure 4 This is a three-dimensional elevation angle schematic diagram of the negative pressure anti-clogging device provided in this embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the piston extension and retraction of the negative pressure anti-blocking device provided in this embodiment of the utility model;

[0026] Figure 6 This is a partial top-view schematic diagram of the negative pressure anti-clogging device provided in this embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of the pressing component of the negative pressure anti-clogging device provided in this embodiment of the utility model;

[0028] Figure 8 This is a front sectional view of the negative pressure anti-clogging device provided in this embodiment of the utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Connecting component; 11. Lower housing; 12. Upper housing; 101. Cavity; 102. Connecting hole; 103. Through hole;

[0031] 2. Negative pressure assembly; 21. Air extraction pipeline; 22. Vacuum pump;

[0032] 3. Pressing assembly; 31. Telescopic mechanism; 32. Pressing component; 321. Frame; 322. Piston; 3211. Guide rod assembly; 323. Hollow hole; 324. Intermediate block; 33. Protective cylinder; 301. First heating element; 302. Second heating element;

[0033] 4. Vent. Detailed Implementation

[0034] 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.

[0035] To address the technical problem of molten material easily adhering to the wall and causing blockage of the venting hole, this utility model provides a negative pressure anti-blockage device that can achieve negative pressure suction and exhaust, and periodically push the hot-melted raw material adhering to the wall in the venting hole to avoid blockage and maintain smooth exhaust.

[0036] Please see Figure 1-8 , Figure 1 This is a schematic diagram of the negative pressure anti-clogging device in one embodiment of the present invention. The negative pressure anti-clogging device is used to install on the exhaust port 4 of the extruder and includes a connector 1, a negative pressure component 2, and a pressing component 3. The connector 1 has a cavity 101 inside and is provided with connecting holes 102 corresponding to the exhaust ports 4. The inner diameter of the connecting holes 102 is the same as the inner diameter of the exhaust ports 4, and the connecting holes 102 are chamfered to form a downwardly inclined arc surface. The negative pressure component 2 is disposed on one side of the connector 1 and communicates with the cavity 101. It is used to connect the exhaust ports 4 and draw negative pressure exhaust. After the connector 1 is installed on the exhaust port 4 of the extruder, the exhaust port 4 is connected. The cavity 101 is then evacuated by the negative pressure component 2 to create negative pressure, which promotes the gas to be discharged from the exhaust port 4 and avoids excessive air from causing air in the extruded pipe, thus affecting the production quality of the pipe. The pressing component 3 includes a telescopic mechanism 31 and a pressing element 32. The telescopic mechanism 31 is installed on the connector 1, and its telescopic end extends into the cavity 101 and is connected to the pressing element 32, so as to drive the pressing element 32 to slide and push the material along the inner wall of the exhaust port 4. The pressing component 3 is used to periodically push the wall-hanging material in the exhaust port 4 downward by driving the pressing element 32 with the telescopic mechanism 31, so as to avoid the hot-melted raw material hanging on the wall and blocking the exhaust port.

[0037] In one embodiment, in order to form a negative pressure suction and exhaust function, the negative pressure component 2 includes a suction pipe 21 and a vacuum pump 22. The suction end of the vacuum pump 22 is connected to one end of the suction pipe 21, and the other end of the suction pipe 21 is connected to the connector 1 and communicates with the cavity 101. By suctioning through the vacuum pump 22, a negative pressure is formed in the cavity 101 through the connection of the suction pipe 21, which promotes the gas to enter the cavity 101 through the exhaust port 4 and then be discharged through the suction pipe 21.

[0038] In one embodiment, to prevent hot-melt material from sticking to the wall and clogging the vent holes, and to ensure continuous venting during the pushing action, the pressing component 32 includes a frame 321 and pistons 322. The number of pistons 322 corresponds one-to-one with the number of vent holes 4. The pistons 322 are mounted on the bottom of the frame 321 via connecting rods. The frame 321 forms a connecting base between the telescopic mechanism 31 and the multiple pistons 322. During the telescopic action of the telescopic mechanism 31, the frame 321 and pistons 322 move together. The top of the piston 322 has a hollow hole 323 along the axial direction. During the telescopic action, the piston 322 contacts the inner wall of the vent hole 4 and pushes down the molten material on it to prevent it from sticking to the wall. Furthermore, the hollow hole 323 allows the vent hole 4 and the cavity 101 to remain in a connected state during the telescopic pushing action, thus avoiding interruption of the negative pressure venting process.

[0039] Understandably, the telescopic mechanism 31 can be made of existing mature equipment with telescopic function, such as hydraulic push rods or electric push rods, to achieve the telescopic control of piston 322 within cavity 101.

[0040] In one embodiment, in order to maintain the negative pressure space, a protective cylinder 33 is connected between the telescopic mechanism 31 and the connector 1. The protective cylinder 33 is installed on the top of the connector 1, and the telescopic end of the telescopic mechanism 31 passes through the protective cylinder 33 and is connected to the frame 321, enclosing the frame 321 inside it and forming a closed space with the cavity 101 to avoid excessive telescopic movement affecting the internal negative pressure.

[0041] Understandably, a vent hole can also be provided on the top of the connector 1 to allow the cavity 101 to communicate with the interior of the protective cylinder 33.

[0042] In one embodiment, to improve the stability of the piston 322's extension and retraction, the frame 321 has guide rod assemblies 3211 corresponding to the piston 322. The top of the connector 1 has through holes 103 corresponding to the guide rod assemblies 3211. The guide rod assemblies 3211 are slidably connected to the corresponding through holes 103. The relative sliding between the guide rod assemblies 3211 and the through holes 103 provides guidance in the extension and retraction direction, thus improving the stability of the extension and retraction. The guide rod assembly 3211 has at least two rods, serving as the connection between the frame 321 and the piston 322, providing support and sliding guidance.

[0043] Furthermore, in order to prevent blockage of the hollow hole 323, the inner top wall of the cavity 101 is provided with an intermediate block 324 corresponding to the axis of the piston 322. The outer diameter of the intermediate block 324 matches the inner diameter of the hollow hole 323. During the extension and retraction action, when the piston 322 is raised, the intermediate block 324 can be inserted into the hollow hole 323 to push down the molten material remaining in the hollow hole 323 and prevent the hollow hole 323 from being blocked.

[0044] Understandably, the intermediate block 324 is installed on the central axis of the piston 322 via a fixing bracket located at the movement gap position of the guide rod assembly 3211 without interfering with it.

[0045] Furthermore, the intermediate block 324 has a built-in first heating element 301 for heating the intermediate block 324 to prevent the material from drying and sticking due to low temperature.

[0046] Furthermore, a second heating element 302 is provided on the inner side of the piston 322 to heat the piston 322 and prevent the material from drying and sticking due to low temperature.

[0047] It is understandable that both the first heating element 301 and the second heating element 302 can be heated by electric heating rods, or other existing equipment with heating functions can be used.

[0048] In one embodiment, for ease of installation and maintenance, the connector 1 includes a lower housing 11 and an upper housing 12. The upper housing 12 is detachably connected to the lower housing 11. The connecting hole 102 is opened at the bottom of the lower housing 11. The upper housing 12 and the lower housing 11 can be installed through detachable structures such as bolt connection or snap-fit ​​connection.

[0049] To better understand this utility model, the following is combined with... Figures 1 to 8 The technical solution of this utility model is described in detail as follows: A vacuum pump 22 is used to create a negative pressure condition, which promotes the gas to be discharged from the exhaust port 4 into the cavity 101, and further discharged through the exhaust pipe 21; during the discharge process, the pressure member 32 is intermittently driven to extend and retract through the telescopic mechanism 31, which presses down the piston 322 and pushes down the molten material hanging on the wall inside the exhaust port 4 to avoid it from sticking to the wall; during the pushing action, the hollow hole 323 provides an exhaust channel that is always connected; when the piston 322 is raised, the middle block 324 is inserted into the hollow hole 323 to push the material on the inner wall of the hollow hole 323 to avoid residue.

[0050] This utility model also provides an extruder, including a negative pressure anti-clogging device as described in any of the above embodiments. The negative pressure anti-clogging device is installed at the exhaust port of the screw extruder to perform negative pressure exhaust and prevent the material from being blocked in the exhaust port.

[0051] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A negative pressure anti-blocking device for installation on a vent hole of an extruder, characterized by, The utility model relates to a negative pressure anti-blocking device for a material conveying device, which comprises a connecting piece with a cavity inside and a plurality of communication holes corresponding to the exhaust holes; a negative pressure assembly arranged on one side of the connecting piece and communicating with the cavity, for communicating with the exhaust holes and exhausting air under negative pressure; and a material pressing assembly comprising a telescopic mechanism and a material pressing piece, wherein the telescopic mechanism is mounted on the connecting piece, the telescopic end of the telescopic mechanism penetrates into the cavity, and the telescopic end is connected with the material pressing piece to drive the material pressing piece to slide along the inner wall of the exhaust hole. The negative pressure assembly comprises an air exhaust pipeline and a vacuum pump, the air exhaust end of the vacuum pump is connected with one end of the air exhaust pipeline, and the other end of the air exhaust pipeline is connected with the connecting piece and communicates with the cavity. The material pressing piece comprises a frame body and a piston, the frame body is connected with the telescopic end of the telescopic mechanism, the number of the pistons corresponds to the number of the exhaust holes, the pistons are mounted on the bottom of the frame body through connecting rods, and the top end of the piston is provided with a hollow hole in the axial direction. The telescopic mechanism is connected with the connecting piece through a protective cylinder, the protective cylinder is mounted on the top of the connecting piece, and the telescopic end of the telescopic mechanism penetrates through the protective cylinder and is connected with the frame body. The frame body is provided with a guide rod set corresponding to the pistons, the top of the connecting piece is provided with a through hole corresponding to the guide rod set, and the guide rod set is slidably connected with the corresponding through hole.

2. The negative pressure anti-clogging device according to claim 1, characterized in that, The inner top wall of the cavity is provided with an intermediate block corresponding to the axis of the piston, and the outer diameter of the intermediate block matches the inner diameter of the hollow hole.

3. The negative pressure anti-clogging device of claim 1, wherein, The intermediate block is provided with a first heating piece for heating the intermediate block.

4. The negative pressure anti-clogging device according to claim 3, characterized in that, The inner side of the piston is provided with a second heating piece for heating the piston.

5. The negative pressure anti-blocking device of claim 4, wherein, The connecting piece comprises a lower shell and an upper shell, the upper shell is detachably connected with the lower shell, and the communication holes are arranged on the bottom of the lower shell.

6. The negative pressure anti-clogging device of claim 3, wherein, The utility model relates to a negative pressure anti-blocking device for a material conveying device, which comprises a connecting piece with a cavity inside and a plurality of communication holes corresponding to the exhaust holes; a negative pressure assembly arranged on one side of the connecting piece and communicating with the cavity, for communicating with the exhaust holes and exhausting air under negative pressure; and a material pressing assembly comprising a telescopic mechanism and a material pressing piece, wherein the telescopic mechanism is mounted on the connecting piece, the telescopic end of the telescopic mechanism penetrates into the cavity, and the telescopic end is connected with the material pressing piece to drive the material pressing piece to slide along the inner wall of the exhaust hole.

7. The negative pressure anti-blocking device of claim 6, wherein, ​ 8. The negative pressure anti-clogging device of claim 3, wherein, ​ 9. The negative pressure plug prevention device of claim 1, wherein, ​ 10. An extruder characterized by, ​

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