Screw drawing mechanism of screw extruder

Abstract

A screw drawing mechanism of a screw extruder comprises an operating platform, a charging barrel fixedly mounted at one end of the operating platform, a linear guide rail fixedly mounted at one end, far away from the charging barrel, of the operating platform, a through hole is formed in the surface of the operating platform, a rack is fixedly arranged at the bottom of a sliding base, and one end of a screw is connected with the output end of a speed reducer; the other end of the screw can penetrate into the charging barrel, the driving shaft is rotationally installed at the end, away from the operation platform, of the hanging bracket, the driving gear is fixedly installed on the driving shaft, the driven shaft is rotationally installed at the end, close to the operation platform, of the hanging bracket, and the first driven gear is fixedly installed on the driven shaft and meshed with the driving gear. The second driven gear is fixedly installed on the driven shaft, one end of the second driven gear penetrates through the through opening and is meshed with the rack, the function that the extruder screw can be pulled is achieved, and therefore the effects of improving the extrusion efficiency and saving the cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer material processing equipment, in particular to a screw drawing mechanism of a screw extruder. Background Art

[0002] In modern industrial production, screw extruders are widely used in the fields of plastics, rubber, food, medicine, cosmetics, etc. Screw extruder is a mechanical equipment used to process and produce polymer materials. Its main function is to melt, mix, extrude and other process steps of solid or semi-solid polymer materials to form products in the shape of plastic films, tubes, plates, rods, etc.

[0003] The existing screw extruders generally have different sections, such as feeding section, melting section, melt conveying section, mixing section, air exhaust section, homogenization section, vacuum exhaust section, metering section, etc., in the extrusion process, which are realized by the combination of screws. At the same time, the combination of screws should be selected according to the specific formula, material characteristics, mixing requirements and operating conditions. In the extrusion process, the material is affected by variables such as rotation speed and temperature in addition to the screw arrangement.

[0004] Existing screw extruders are all integrated structures and there are many variables that affect the quality of material extrusion. When the quality of the extruded product changes, the test results can only be judged by observing the state of the discharge, relying on experience to infer which variable affects the result, and continuous trial and error to infer the section where the problem occurs. This consumes a lot of time, manpower, and materials, which in turn affects the extrusion efficiency of the material. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the prior art that due to the integrated structure of the existing screw extruder, it is inconvenient to observe the various sections of the screw, which leads to inconvenience in detecting problems when problems occur in the material extrusion process, thereby affecting the working efficiency of the extruder and wasting materials. A screw pulling mechanism for a screw extruder is proposed, which has the function of pulling the screw of the extruder, thereby improving the extrusion efficiency and saving costs.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A screw pulling mechanism of a screw extruder comprises: an operating platform, a barrel is fixedly mounted on one end of the operating platform, a linear guide is fixedly mounted on the end of the operating platform away from the barrel, and a through opening is opened on the table of the operating platform;

[0008] A sliding base, wherein the sliding base is slidably mounted on the linear guide rail, a rack is fixedly arranged at the bottom of the sliding base, a first motor is fixedly mounted on the sliding base through a bearing seat, a shaft of the first motor is connected to a first reducer through a coupling, one end of the screw is connected to an output end of the reducer, and the other end of the screw can penetrate into the interior of the barrel;

[0009] A fixed plate, wherein the fixed plate is fixedly mounted on the bottom of the operating platform, a hanger and a motor seat are suspended on the fixed plate, a second motor is fixedly mounted on the motor seat, a shaft of the second motor is fixedly connected to a driving shaft, the driving shaft is rotatably mounted on an end of the hanger away from the operating platform, a driving gear is fixedly mounted on the driving shaft, the driven shaft is rotatably mounted on an end of the hanger close to the operating platform, a first driven gear is fixedly mounted on the driven shaft and meshes with the driving gear, a second driven gear is fixedly mounted on the driven shaft, one end of the second driven gear passes through a through opening and meshes with the rack.

[0010] Preferably, the tail of the barrel is tightly matched with the flange.

[0011] Preferably, baffles are provided at both ends of the linear guide rail, and the baffles are fixedly mounted on the operating platform.

[0012] Preferably, both ends of the bottom of the sliding base are provided with sliding blocks, and the sliding blocks are slidably mounted on the linear slide rails.

[0013] Preferably, the upper cover of the linear guide rail is covered with a protective cover, and the protective cover is a corrugated telescopic cover, one end of the protective cover is sealed and connected to the slider, and the other end of the protective cover is sealed and connected to the corresponding end baffle.

[0014] Preferably, a plurality of expansion and shrinkage prevention holes are provided on the linear guide rail.

[0015] Preferably, the rack is made of stainless steel.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The device is provided by installing a driving end composed of a first motor and a first speed reducer for driving a screw to rotate for extrusion operation on a sliding base, and slidingly installing the sliding base on a linear guide rail, through a second motor and a second speed reducer (16) arranged at the bottom of an operating platform and a driving gear cooperating with a driven gear, through the linkage between the gears, the second driven gear cooperates with the rack to finally drive the sliding base to slide on the linear guide rail, and then drives the screw to move relative to the barrel, thereby completing the purpose of pulling and moving the screw of the extruder, and pulling out the screw to expose various sections of the screw, so that it is convenient for operators to check various sections of the screw when extrusion quality problems occur during the extrusion of materials, which is beneficial to improving the maintenance efficiency and thus improving the extrusion efficiency and production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the device;

[0019] Figure 2 This is a schematic diagram of the bottom structure of the operating platform of the device;

[0020] Figure 3 This is a partial enlarged view of the pulling mechanism of this device.

[0021] In the figure: 1 operating platform, 2 barrel, 3 linear guide, 4 anti-expansion and shrinkage hole, 5 first motor, 6 first reducer, 7 screw, 8 rack, 9 sliding base, 10 baffle, 11 protective cover, 12 flange, 13 fixed plate, 14 hanger, 15 second motor, 16 second reducer, 17 driving shaft, 18 first driven gear, 19 driven shaft, 20 second driven gear, 21 driving gear. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] Reference Figure 1-3 A screw pulling mechanism of a screw extruder comprises: an operating platform 1, a barrel 2 fixedly mounted at one end of the operating platform 1, a linear guide rail 3 fixedly mounted at the end of the operating platform 1 away from the barrel 2, a through opening is provided on the table of the operating platform 1, and the preset through opening facilitates the cooperation between the second driven gear 20 and the rack 8 above the operating platform 1;

[0024] A sliding base 9, wherein the sliding base 9 is slidably mounted on the linear guide rail 3, a rack 8 is fixedly arranged at the bottom of the sliding base 9, a first motor 5 is fixedly mounted on the sliding base 9 through a bearing seat, a shaft of the first motor 5 is connected to a first reducer 6 through a coupling, one end of a screw 7 is connected to an output end of the reducer, and the other end of the screw 7 can penetrate into the interior of the barrel 2, further, the tail of the barrel 2 is tightly matched with the flange 12, which is beneficial to prevent the barrel 2 from leaking when the rack 8 is pulled relative to the barrel 2, and is beneficial to avoid material waste;

[0025] A fixed plate 13, wherein the fixed plate 13 is fixedly mounted on the bottom of the operating platform 1, and the fixed plate 13 is beneficial to improving the overall stability of the hanger 14 and the pulling mechanism. The hanger 14 and the motor seat are suspended on the fixed plate 13, and the second motor 15 is fixedly mounted on the motor seat. The shaft of the second motor 15 is fixedly connected to the drive shaft 17, and the drive shaft 17 is rotatably mounted on the end of the hanger 14 away from the operating platform 1. The driving gear 21 is fixedly mounted on the drive shaft 17, and the driven shaft 19 is rotatably mounted on the end of the hanger 14 close to the operating platform 1. The first driven gear 18 is fixedly mounted on the driven shaft 19 and meshes with the driving gear 21. The second driven gear 20 is fixedly mounted on the driven shaft 19, and one end of the second driven gear 20 passes through the through opening and meshes with the rack 8. The outer diameter of the second driven gear 20 is greater than the outer diameter of the first driven gear 18, which is beneficial to further reduce the moving speed of the rack 8 and the sliding base 9 during the pulling process, and finally ensure the stability of the screw 7 during the pulling process.

[0026] In another embodiment of the present application, baffles 10 are provided at both ends of the linear guide rail 3, and the baffles 10 are fixedly mounted on the operating platform 1. The baffles 10 are beneficial to limit the sliding base 9, thereby preventing the sliding base 9 from being separated from the linear guide rail 3 when it moves to the end point of the motion trajectory.

[0027] On the other hand, both ends of the bottom of the sliding base 9 are provided with sliders, and the sliders are slidably installed on the linear slide rails. The linear guide rail 3 is covered with a protective cover 11, and the protective cover 11 is a corrugated telescopic cover. One end of the protective cover 11 is sealed with the slider, and the other end of the protective cover 11 is sealed with the corresponding end baffle 10. The protective cover 11 can keep the linear guide rail 3 always covered and protected as the sliding base 9 moves. The corrugated telescopic cover ensures that the elastic force of the protective cover 11 can expand the cover as needed. The setting of the protective cover 11 is beneficial to prevent materials from spilling on the linear guide rail 3 and affecting the normal movement of the sliding base 9, which is beneficial to ensure the pulling function of the screw 7.

[0028] Working principle of the device: The device is provided with a driving end composed of a first motor 5 and a first reducer 6 for rotating the driving screw 7 for extrusion operation, and the sliding base 9 is slidably installed on the linear guide 3. The second motor 15 and the second reducer 16 and the driving gear 21 arranged at the bottom of the operating platform 1 cooperate with the driven gear. Through the linkage between the gears, the second driven gear 20 cooperates with the rack 8 to finally drive the sliding base 9 to slide on the linear guide 3, and then drive the screw 7 to move relative to the barrel 2, so as to complete the purpose of pulling and moving the screw 7 of the extruder, and pull out the screw 7 to expose the various sections of the screw 7, so as to facilitate the operator to check the various sections of the screw 7 when there is an extrusion quality problem during the material extrusion process. Specifically:

[0029] When in normal working state, the sliding base 9 and the driving end of the driving screw 7 above it for extrusion operation are in working state, and the sliding base 9 is at one end of the linear guide rail 3 close to the barrel 2, and the pulling mechanism is in standby state;

[0030] When there is a problem with the extruder material extrusion, the second motor 15 in the pulling mechanism can be started. When the second motor 15 rotates forward, the driving gear 21 is driven to rotate through the driving shaft 17. The driving gear 21 drives the driven shaft 19 to rotate through the first driven gear 18, and then drives the second driven gear 20 to rotate. Finally, the sliding base 9 is driven to slide on the linear guide 3 toward the end away from the barrel 2 through the cooperation with the rack 8, and finally the screw 7 is pulled out to expose the various sections of the screw 7, which is convenient for the operator to judge the material conditions of each section of the screw in time; it is also convenient for the operator to clean the screw; further, the second motor 15 and the driving shaft 17 can also be connected to the second reducer 16 through a coupling. The second reducer 16 is beneficial to ensure that the speed of pulling the screw 7 is slow and improve the pulling stability. The operator can intuitively see the cause of the problem, thereby improving the extrusion quality and work efficiency of the extruder, avoiding the situation of repeated trial and error and wasting materials, and saving costs.

[0031] When the influencing variables are determined or the screw is cleaned, the second motor 15 is operated to reverse, which can drive the sliding base 9 to move closer to the barrel 2, and finally send the screw 7 back. After the above process, the device realizes the function of pulling the screw 7 and improves the working efficiency of the extruder. A number of anti-expansion and shrinkage holes 4 are provided on the linear guide 3, which is beneficial to avoid the deformation of the linear guide 3 caused by temperature and affect the pulling or sending back of the screw 7; the rack 8 is made of stainless steel, which is beneficial to improve the service life of the pulling mechanism.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A screw pulling mechanism for a screw extruder, characterized in that: include: An operating platform (1), a barrel (2) is fixedly mounted on one end of the operating platform (1), a linear guide rail (3) is fixedly mounted on the end of the operating platform (1) away from the barrel (2), and a through opening is opened on the table top of the operating platform (1); A sliding base (9), wherein the sliding base (9) is slidably mounted on the linear guide rail (3), a rack (8) is fixedly arranged at the bottom of the sliding base (9), a first motor (5) is fixedly mounted on the sliding base (9) via a bearing seat, a shaft of the first motor (5) is connected to a first reducer (6) via a coupling, one end of a screw (7) is connected to an output end of the reducer, and the other end of the screw (7) can penetrate into the interior of the barrel (2); A fixed plate (13), the fixed plate (13) is fixedly mounted on the bottom of the operating platform (1), a hanger (14) and a motor seat are suspended on the fixed plate (13), a second motor (15) is fixedly mounted on the motor seat, a shaft of the second motor (15) is fixedly connected to a drive shaft (17), the drive shaft (17) is rotatably mounted on an end of the hanger (14) away from the operating platform (1), a driving gear (21) is fixedly mounted on the drive shaft (17), a driven shaft (19) is rotatably mounted on an end of the hanger (14) close to the operating platform (1), a first driven gear (18) is fixedly mounted on the driven shaft (19) and meshes with the driving gear (21), a second driven gear (20) is fixedly mounted on the driven shaft (19), one end of the second driven gear (20) passes through a through opening and meshes with the rack (8).

2. The screw pulling mechanism of a screw extruder according to claim 1, characterized in that: The rear end of the barrel (2) is tightly matched with the flange (12).

3. The screw pulling mechanism of a screw extruder according to claim 1, characterized in that: Baffles (10) are provided at both ends of the linear guide rail (3), and the baffles (10) are fixedly mounted on the operating platform (1).

4. The screw pulling mechanism of a screw extruder according to claim 3, characterized in that: Both ends of the bottom of the sliding base (9) are provided with sliding blocks, and the sliding blocks are slidably mounted on the linear slide rails.

5. The screw pulling mechanism of a screw extruder according to claim 4, characterized in that: The upper cover of the linear guide rail (3) is covered with a protective cover (11), which is a corrugated telescopic cover. One end of the protective cover (11) is sealed to the slider, and the other end of the protective cover (11) is sealed to the corresponding end baffle (10).

6. The screw pulling mechanism of a screw extruder according to claim 5, characterized in that: The linear guide rail (3) is provided with a plurality of expansion and contraction prevention holes (4).

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