Flat double-screw all-in-one machine

Abstract

The utility model belongs to the technical field of extruders, and relates to a flat double-screw all-in-one machine which comprises a machine barrel and flat double screws, the flat double screws rotate in the machine barrel in opposite directions, and each flat double screw is sequentially provided with a first screw conveying section, a cut-off section and a second screw conveying section in the material conveying direction. The stop section is correspondingly provided with a first filter, the conveying tail end of the first screw conveying section is communicated with a feeding port of the first filter, and a discharging port of the first filter is communicated with the conveying starting end of the second screw conveying section. According to the flat double-screw all-in-one machine provided by the utility model, an on-line filtering mode is adopted, and all working procedures can be completed by only using one set of screw extrusion equipment, so that the structure is simplified, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of extruder relates to a kind of flat double screw integrated machine. BACKGROUND

[0002] Flat double screw extruder is developed on the basis of single screw extruder, and it has been widely used in the forming processing of extruded products due to its good feeding performance, mixing plasticizing performance, exhaust performance and extrusion stability.

[0003] When the material of flat double screw extruder contains more impurities (such as using waste recycled plastic), two sets of screw extrusion equipment are needed. The first set of screw extrusion equipment processes the raw material into a molten state and inputs the filter device for filtering. The filtered molten material is then sent to the second set of screw extrusion equipment for extrusion molding. For example, Chinese Utility Model CN203210662U (publication date: September 25, 2013) discloses a waste plastic reactive modification equipment, which includes a first-order extruder and a second-order extruder. The first-order extruder is a single screw extruder, and the second-order extruder is a parallel double screw extruder. The first-order extruder has a waste material inlet and an air outlet hole. A filter screen is fixed at the tail end of the first-order extruder. The second-order extruder has a feed inlet and a metering pump. The feed inlet is located directly below the discharge port of the first-order extruder. This device uses two sets of screw extrusion equipment, so the structure is relatively complex and the cost is relatively high. SUMMARY

[0004] The utility model provides a kind of flat double screw integrated machine to the deficiency of prior art, using the way of on-line filtering, only using a set of screw extrusion equipment can complete all processes, so as to simplify structure, save cost.

[0005] To solve the above technical problems, the utility model achieves the purpose through the following technical scheme:

[0006] A kind of flat double screw integrated machine, including cylinder and flat double screw, the flat double screw rotates in cylinder oppositely, the flat double screw is sequentially provided with first screw conveying section, cutoff section and second screw conveying section along material conveying direction, the cutoff section is correspondingly provided with first filter, the conveying end of first screw conveying section is communicated with the feed inlet of first filter, and the discharge port of first filter is communicated with the conveying start end of second screw conveying section.

[0007] In the above-mentioned flat double screw integrated machine, the screw rotation shaft of the first screw conveying section is provided with first helical blade, the screw rotation shaft of the second screw conveying section is provided with second helical blade, and the screw rotation shaft of the cutoff section is provided with a plurality of radial blades at intervals.

[0008] In the above-mentioned flat double screw integrated machine, the first helical blade of the first screw conveying section is provided with variable pitch, and the pitch of the conveying end is smaller than that of other parts.

[0009] In the above-mentioned flat double screw integrated machine, the conveying end of the first screw conveying section, the cutoff section and the conveying starting end of the second screw conveying section are provided with a cutoff box, and the barrel is provided in a two-section structure and is connected to the two ends of the cutoff box respectively; preferably, the barrel and the cutoff box are connected through flanges.

[0010] In the above-mentioned flat double screw integrated machine, the radial blade of the cutoff section is sealingly connected to the inner wall of the cutoff box and forms a cutoff structure, the first filter is arranged above the cutoff box, the feed inlet of the first filter is communicated with the conveying end of the first screw conveying section through a feed pipeline, and the discharge outlet is communicated with the conveying starting end of the second screw conveying section through a discharge pipeline.

[0011] In the above-mentioned flat double screw integrated machine, the first filter comprises a foreign matter discharge pipeline, the foreign matter discharge pipeline is provided with a downwardly extending foreign matter discharge hopper, and the end of the foreign matter discharge hopper is provided with a foreign matter collection box on the ground; further, the first filter is also provided with a backwashing structure, through which the filter screen can be backwashed and discharged through the foreign matter discharge pipeline.

[0012] In the above-mentioned flat double screw integrated machine, the feed pipeline is communicated with the conveying starting end of the second screw conveying section through a material passing pipeline, the material passing pipeline is provided with a material passing valve for controlling the communication state thereof, and the discharge pipeline is provided with a discharge valve for controlling the communication state thereof.

[0013] In the above-mentioned flat double screw integrated machine, the conveying starting end of the first screw conveying section is provided with a shredder, and the feed hopper of the shredder is connected to a feeding device; the feeding device is preferably a circulating conveying belt for conveying material upwardly; further, at least one pair of shredding rollers is rotatably arranged in the shredding cavity of the shredder, the shredding rollers are arranged in parallel and spaced apart, the outer circumferential surface of the shredding rollers is provided with shredding knives, and the bottom of the shredding cavity corresponding to the gap between the shredding rollers is provided with a bottom knife, which cooperates with the shredding knives on the two shredding rollers to shred the material.

[0014] In the above-mentioned flat double screw integrated machine, the conveying end of the second screw conveying section is provided with a second filter, the feed inlet of the second filter is connected to the barrel of the second screw conveying section, and the discharge outlet is connected to an extrusion die; preferably, the second filter is a self-cleaning filter.

[0015] In the above-mentioned flat double screw integrated machine, the screw rotation shaft is drivingly connected to the driving motor through a transmission box.

[0016] In the aforementioned flat twin-screw integrated machine, the cut-off box includes two sub-boxes, left and right, which are symmetrically arranged and detachably fixedly connected.

[0017] In the aforementioned flat twin-screw integrated machine, a vacuum pumping device communicating with the inner cavity of the barrel is provided on the barrel, and the vacuum pumping device is correspondingly provided at the end of the second screw conveying section near the cut-off section.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] 1. This utility model provides a flat twin-screw integrated extruder. A stop section divides the flat twin screw into two independent screw conveying sections. A first filter connects the two screw conveying sections. Material from the first screw conveying section is filtered before entering the second screw conveying section, thus achieving online filtration. Through online filtration, this utility model can complete all processes using only one set of screw extrusion equipment, thereby simplifying the structure and saving costs.

[0020] 2. The present invention further includes a material conveying pipe, a material conveying valve, and a discharge valve on the first filter. Through the above devices, the conveying end of the first screw conveying section can be directly connected to the conveying start end of the second screw conveying section through the material conveying pipe. Material can be directly conveyed when filtration is not required, thereby expanding the scope of application of the present invention.

[0021] 3. This utility model uses a pair of parallel screws rotating in opposite directions to convey materials, which can meet the automatic conveying needs of materials of various specifications; it uses a first filter with self-cleaning and backwashing functions and a second filter with self-cleaning function to meet the needs of automatic online filtration; it uses material shredding, quantitative and forced feeding to meet the needs of automatic feeding; through the above configurations, the fully automated operation of the flat twin-screw integrated machine is realized. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a perspective view (middle section) of this utility model;

[0024] Figure 3 This is a perspective view of the flat double screw of this utility model;

[0025] Figure 4 This is a perspective view of the stop box of this utility model.

[0026] Reference numerals: 1. Barrel; 2. Flat twin screw; 21. First screw conveyor section; 22. Cut-off section; 23. Second screw conveyor section; 24. Screw rotation shaft; 25. First helical blade; 26. Second helical blade; 27. Radial blade; 3. First filter; 31. Feed pipe; 32. Discharge pipe; 33. Material passage pipe; 34. Material passage valve; 35. Discharge valve; 4. Cut-off box; 5. Shredder; 6. Second filter; 7. Extrusion die; 8. Vacuum device. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figures 1-4 :

[0028] A flat twin-screw integrated machine includes a barrel 1 and a flat twin-screw 2. The flat twin-screw 2 rotates in opposite directions inside the barrel 1. The flat twin-screw 2 is sequentially provided with a first screw conveying section 21, a stop section 22, and a second screw conveying section 23 along the material conveying direction. A first filter 3 is correspondingly provided in the stop section 22. The conveying end of the first screw conveying section 21 is connected to the inlet of the first filter 3, and the outlet of the first filter 3 is connected to the conveying start end of the second screw conveying section 23.

[0029] The working method of this embodiment is as follows: the material enters the barrel 1 through the feeding device, the flat twin screws 2 are driven by the motor to rotate in opposite directions and transport the material. When the material is transported forward through the first screw conveying section 21, it is heated to a molten state. After the molten material enters the end of the first screw conveying section 21, due to the presence of the cut-off section 22, the material cannot continue to be transported forward, but enters the feed port of the first filter 3. After being filtered by the first filter 3, it is discharged from the discharge port. The filtered molten material enters the beginning of the second screw conveying section 23, and then is transported forward through the second screw conveying section 23, and finally extruded and formed by the extrusion die 7.

[0030] Specifically, the first screw conveying section 21 has a first helical blade 25 on its screw rotating shaft 24, the second screw conveying section 23 has a second helical blade 26 on its screw rotating shaft 24, and the cut-off section 22 has a plurality of radial blades 27 spaced apart on its screw rotating shaft 24. The first helical blade 25 and the second helical blade 26 can both convey material forward when rotating, while the radial blades 27 cannot convey material when rotating, thus cutting off material conveying.

[0031] The first screw blade 25 of the first screw conveying section 21 is configured with variable pitch, and the pitch at the conveying end is smaller than the pitch of other parts. By squeezing the material at the conveying end of the first screw conveying section 21, the material can smoothly enter the first filter 3.

[0032] The conveying end of the first screw conveyor section 21, the stop section 22, and the conveying start end of the second screw conveyor section 23 are all fitted with a stop box 4. The barrel 1 has a two-section structure and is respectively connected to both ends of the stop box 4; preferably, the barrel 1 and the stop box 4 are connected by a flange. By setting the stop box 4, the transfer of materials in the first screw conveyor section 21, the first filter 3, and the second screw conveyor section 23 can all be completed within the stop box 4, making the material conveying smoother.

[0033] Furthermore, the radial blades 27 of the cut-off section 22 are sealed to the inner wall of the cut-off box 4 to form a cut-off structure. The first filter 3 is disposed above the cut-off box 4. The inlet of the first filter 3 is connected to the conveying end of the first screw conveying section 21 through the inlet pipe 31, and the outlet is connected to the conveying start end of the second screw conveying section 23 through the outlet pipe 32.

[0034] The first filter 3 mentioned above includes a waste discharge pipe, and a waste discharge hopper extending downwards is correspondingly provided on the waste discharge pipe. A waste discharge collection box located on the ground is correspondingly provided at the end of the waste discharge hopper. The first filter 3 can be automatically cleaned by the waste discharge pipe in conjunction with a scraper. Furthermore, the first filter 3 is also provided with a backwashing structure. The filter screen can be backwashed by the backwashing structure and discharged through the waste discharge pipe.

[0035] This embodiment further incorporates a selective filtration structure. The feed pipe 31 is connected to the starting end of the second screw conveyor section 23 via the feed pipe 33. The feed pipe 33 is equipped with a feed valve 34 to control its connection state, and the discharge pipe 32 is equipped with a discharge valve 35 to control its connection state. When the feed valve 34 is closed and the discharge valve 35 is opened, the material is normally filtered by the first filter 3. When the feed valve 34 is opened and the discharge valve 35 is closed, the material enters the second screw conveyor section 23 directly without filtration.

[0036] To better facilitate the use of recycled plastics, a shredder 5 is installed at the starting end of the first screw conveyor section 21. The feed hopper of the shredder 5 is connected to a feeding device. The feeding device is preferably a circulating conveyor belt that conveys materials upward. Furthermore, at least one pair of shredding rollers are rotatably arranged inside the shredding chamber of the shredder 5. The shredding rollers are spaced apart and arranged in parallel. Shredding blades are provided on the outer circumferential surface of the shredding rollers. Bottom blades are provided at the bottom of the shredding chamber corresponding to the gap between the shredding rollers. The bottom blades cooperate with the shredding blades on the two shredding rollers to shred the material. The shredder 5 with the above structure can realize forced feeding of materials, and is especially suitable for the recycling of waste plastics.

[0037] To make the material cleaner, a second filter 6 is provided at the end of the second screw conveyor section 23. The inlet of the second filter 6 is connected to the barrel 1 of the second screw conveyor section 23, and the outlet is connected to the extrusion die 7. The material can be filtered twice before extrusion, by the first filter 3 and the second filter 6. Preferably, the second filter 6 is a self-cleaning filter.

[0038] The aforementioned screw rotating shaft 24 is connected to the drive motor via a transmission box. The structure of the drive motor and the transmission box is the same as that of a conventional flat twin-screw extruder.

[0039] Comparison Appendix Figure 4 The aforementioned cutoff box 4 includes two sub-boxes, left and right. The sub-boxes are symmetrically arranged and detachably fixed. Through the split structure of the cutoff box 4, it is convenient to install and clean the impurities inside the cutoff box 4.

[0040] The aforementioned barrel 1 is equipped with a vacuum pumping device 8 that communicates with the inner cavity of the barrel 1. The vacuum pumping device 8 is positioned corresponding to the end of the second screw conveying section 23 near the cutoff section 22. By providing the vacuum pumping device 8, contaminated air in the inner cavity of the barrel 1 can be extracted, making the entire conveying structure cleaner.

[0041] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A flat twin-screw integrated machine, comprising a barrel (1) and a flat twin-screw (2), wherein the flat twin-screw (2) rotates in opposite directions within the barrel (1), characterized in that, The flat twin screw (2) is provided with a first screw conveying section (21), a cut-off section (22), and a second screw conveying section (23) in sequence along the material conveying direction. The cut-off section (22) is provided with a first filter (3). The conveying end of the first screw conveying section (21) is connected to the inlet of the first filter (3), and the outlet of the first filter (3) is connected to the conveying start end of the second screw conveying section (23).

2. The flat twin-screw integrated machine according to claim 1, characterized in that, The first screw conveying section (21) has a first helical blade (25) on its screw rotating shaft (24), the second screw conveying section (23) has a second helical blade (26) on its screw rotating shaft (24), and the cut-off section (22) has a plurality of radial blades (27) spaced apart on its screw rotating shaft (24).

3. The flat twin-screw integrated machine according to claim 2, characterized in that, The first helical blade (25) of the first screw conveying section (21) is pitch-variable, and the pitch at the conveying end is smaller than the pitch of other parts.

4. The flat twin-screw integrated machine according to claim 2, characterized in that, The first screw conveying section (21) at its conveying end, the stop section (22) and the second screw conveying section (23) at its conveying start end are fitted with a stop box (4). The barrel (1) is in a two-section structure and is connected to both ends of the stop box (4).

5. A flat twin-screw integrated machine according to claim 4, characterized in that, The radial blades (27) of the cut-off section (22) are sealed to the inner wall of the cut-off box (4) to form a cut-off structure. The first filter (3) is set above the cut-off box (4). The inlet of the first filter (3) is connected to the conveying end of the first screw conveying section (21) through the inlet pipe (31), and the outlet is connected to the conveying start end of the second screw conveying section (23) through the outlet pipe (32).

6. A flat twin-screw integrated machine according to claim 5, characterized in that, The feed pipe (31) is connected to the starting end of the second screw conveyor section (23) through the feed pipe (33). The feed pipe (33) is equipped with a feed valve (34) to control its connection state, and the discharge pipe (32) is equipped with a discharge valve (35) to control its connection state.

7. A flat twin-screw integrated machine according to claim 1, characterized in that, A shredder (5) is provided at the starting end of the first screw conveyor section (21). The feed hopper of the shredder (5) is connected to a feeding device. At least one pair of shredding rollers are rotatably arranged in the shredding chamber of the shredder (5). The shredding rollers are spaced apart and arranged in parallel. Shredding blades are provided on the outer circumferential surface of the shredding rollers. Bottom blades are provided at the bottom of the shredding chamber corresponding to the gap between the shredding rollers. The bottom blades cooperate with the shredding blades on the two shredding rollers to shred the material.

8. A flat twin-screw integrated machine according to claim 1, characterized in that, The second screw conveying section (23) is provided with a second filter (6) at the conveying end. The feed port of the second filter (6) is connected to the barrel (1) corresponding to the second screw conveying section (23), and the discharge port is connected to the extrusion die (7).

9. A flat twin-screw integrated machine according to claim 4, characterized in that, The cut-off box (4) includes two sub-boxes, left and right, which are symmetrically arranged and detachably fixedly connected.

10. A flat twin-screw integrated machine according to claim 1, characterized in that, The barrel (1) is provided with a vacuum pumping device (8) that communicates with the inner cavity of the barrel (1). The vacuum pumping device (8) is provided with a corresponding end of the second screw conveying section (23) near the cut-off section (22).

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