Novel single-screw press master

Abstract

The utility model discloses a novel single-screw press master which comprises a machine barrel, a screw shaft positioned in the machine barrel, a feed port positioned on one side of the machine barrel and a discharge port positioned on the other side of the machine barrel, the machine barrel is formed by sequentially connecting a low-pressure area screen cylinder structure, a medium-pressure area screen cylinder structure and a high-pressure area screen cylinder structure; the low-pressure area screen cylinder structure comprises L circular screen cylinders; the medium-pressure area screen cylinder structure comprises M circular screen cylinders and N non-circular screen cylinders; the high-pressure area screen cylinder structure comprises K non-circular screen cylinders. The low-pressure area, the medium-pressure area and the high-pressure area are arranged in a partitioned mode, the circular screen cylinder structure and the non-circular screen cylinder structure are ingeniously combined, universality, flexibility and construction, operation and maintenance cost are considered, the structure is more reasonable and ingenious, and wide application and popularization can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pulping technical field, especially a spiral extruding pulper. BACKGROUND

[0002] Single screw extruding pulper material conveying follows frictional drag conveying mechanism, that is, when material friction with inner wall is greater than material friction with screw shaft surface, material and inner wall are relatively stationary, and material displacement conveying along screw shaft is realized by screw rib scraping.

[0003] In single screw extruding pulper, material is conveyed to variable diameter and pitch compression screw section after entering the equipment, and due to volume change, pulp advancing direction space is gradually reduced and subjected to extrusion, and extruded waste liquid passes through sieve drum and is discharged from liquid discharge port, and pulp in screw shaft non-screw rib area is accumulated due to interception, reaches certain (such as set) concentration, and is pushed forward, and is discharged at outlet back pressure disc and screw gap.

[0004] The upper and lower sieve drums in the prior art single screw extruding pulper are mainly divided into two structures, the first is a circular structure, and the second is a non-circular structure, such as the non-circular structure in the single screw extruding pulper with non-circular double anti-slip key structure disclosed in Chinese patent No. 202123132700.0.

[0005] The first circular structure: when material is compacted into a solid plug due to screw groove volume gradually reducing along the screw axis, and the friction between the solid plug and the screw surface is greater than the friction between the solid plug and the inner wall of the cylinder, the material will be "locked" on the screw surface and relatively stationary, and the material cannot be displaced and conveyed, which is commonly known as "rod slipping", and the material conveying function fails.

[0006] The second non-circular structure: due to the non-circular structure of the upper and lower sieve drums / sieve hubs, the wedge-shaped anti-slip key, and the space surrounded by the inner wall of the upper and lower sieve hubs and the outer edge of the screw shaft, the cross-sectional area of the material plug in the space is several times larger, which can withstand greater shear force, and is less likely to separate due to shear rupture of the material plug in the screw groove, which can effectively reduce the occurrence of "rod slipping", but the non-circular structure requires special tooling during processing, has high processing precision requirements, is relatively easy to deform, and has relatively high production cost.

[0007] Therefore, how to seek some more types of spiral extruding pulpers to provide more abundant or better technical solutions to optimize the above problems needs further research and solution. SUMMARY

[0008] The utility model discloses a novel single screw extruding pulper.

[0009] Technical solution: To solve the above technical problems, the utility model provides a novel single screw extruder, which comprises a cylinder, a screw shaft located in the cylinder, a feeding port located on one side of the cylinder and a discharging port located on the other side of the cylinder.

[0010] The cylinder is sequentially connected by a low-pressure area sieve drum structure, a medium-pressure area sieve drum structure and a high-pressure area sieve drum structure along the material conveying direction.

[0011] The low-pressure area sieve drum structure comprises L circular sieve drums, wherein L is greater than or equal to 2.

[0012] The medium-pressure area sieve drum structure comprises M circular sieve drums and N non-circular sieve drums, wherein M is greater than or equal to 1 and N is greater than or equal to 1.

[0013] The high-pressure area sieve drum structure comprises K non-circular sieve drums, wherein K is greater than or equal to 1.

[0014] As a preferred solution, the low-pressure area sieve drum structure comprises a first circular sieve drum and a second circular sieve drum which are sequentially connected along the material conveying direction.

[0015] The medium-pressure area sieve drum structure comprises a third circular sieve drum and a first non-circular sieve drum which are sequentially connected along the material conveying direction.

[0016] The high-pressure area sieve drum structure comprises a second non-circular sieve drum.

[0017] Further preferably, the first non-circular sieve drum in the medium-pressure area sieve drum structure and the second non-circular sieve drum in the high-pressure area sieve drum structure are both provided with double anti-skid keys.

[0018] As one of the preferred solutions, the first non-circular sieve drum in the medium-pressure area sieve drum structure and the second non-circular sieve drum in the high-pressure area sieve drum structure both adopt a non-circular sieve drum structure.

[0019] The non-circular sieve drum structure comprises a first upper sieve hub and a first lower sieve hub.

[0020] The inner hole cross sections of the first upper sieve hub and the first lower sieve hub are both incomplete semicircular sections, and the inner hole horizontal center axes of the first upper sieve hub and the first lower sieve hub are separated; the inner hole horizontal center axes of the first upper sieve hub and the first lower sieve hub are both parallel to and do not coincide with the horizontal center axis of the screw shaft.

[0021] As another preferred solution, the first non-circular sieve drum in the medium-pressure area sieve drum structure and the second non-circular sieve drum in the high-pressure area sieve drum structure both adopt a non-circular sieve drum structure.

[0022] The non-circular sieve drum structure comprises a first upper sieve hub and a first lower sieve hub.

[0023] The inner hole cross sections of the first upper sieve hub and the first lower sieve hub are both inferior arc bows.

[0024] Further preferably, in each non-circular screen drum structure, a first anti-skid key strip is clamped between the left side of the first upper screen hub and the left side of the first lower screen hub corresponding thereto; and a second anti-skid key strip is clamped between the right side of the first upper screen hub and the right side of the first lower screen hub corresponding thereto.

[0025] Further preferably, in the non-circular screen drum structure, the distance between the inner side of the first anti-skid key strip and the outer edge of the spiral shaft is adjustable in the radial direction; and the distance between the inner side of the second anti-skid key strip and the outer edge of the spiral shaft is adjustable in the radial direction.

[0026] Further preferably, in the non-circular screen drum structure, the radial clearances between the outer edge of the spiral shaft and the inner wall of the corresponding barrel are not completely equal; and among the radial clearances between the outer edge of the spiral shaft and the inner wall of the corresponding barrel, the top clearance and the bottom clearance are smaller, the two side clearances gradually increase, and the radial clearance is the largest at the positions of the first anti-skid key strip and the second anti-skid key strip.

[0027] Further preferably, the first anti-skid key strip and the second anti-skid key strip are both long strip-shaped anti-skid key strips with rectangular cross sections; and the first anti-skid key strip and the second anti-skid key strip are both clamped between the left and right sides of the corresponding first upper screen hub and first lower screen hub by means of bolt clamping and locking.

[0028] Preferably, the spiral shaft is a spiral shaft with a gradually increasing diameter from the feed inlet to the discharge outlet, a gradually decreasing screw groove, and a gradually decreasing pitch.

[0029] Preferably, the first circular screen drum in the low-pressure zone screen drum structure, the second circular screen drum in the low-pressure zone screen drum structure, and the third circular screen drum in the medium-pressure zone screen drum structure all adopt a circular screen drum structure.

[0030] The circular screen drum structure comprises a second upper screen hub with a semicircular cross section and a second lower screen hub with a semicircular cross section.

[0031] Further preferably, the inner hole cross sections of the first circular screen drum and the second circular screen drum in the low-pressure zone screen drum structure are both circular cross sections.

[0032] Further preferably, the inner hole cross section of the third circular screen drum in the medium-pressure zone screen drum structure is a circular cross section.

[0033] Further preferably, the inner hole cross section area of the first non-circular screen drum in the medium-pressure zone screen drum structure is greater than the inner hole cross section area of the third circular screen drum in the medium-pressure zone screen drum structure.

[0034] Beneficial effects: the novel single screw extruder provided by the utility model, compared with prior art, through the partition setting / design of low-pressure area, medium-pressure area and high-pressure area, the circular screen drum structure and the non-circular screen drum structure are ingeniously combined, the "pole slipping" situation is reduced, the material concentration effect is improved, the processing efficiency is improved, the construction / manufacturing cost and the maintenance cost of the whole equipment are greatly reduced, in general, the versatility, flexibility and construction and operation cost are considered, the structure is more reasonable and ingenious, and can be widely popularized and applied.

[0035] Further, the novel single screw extruder provided by the utility model, through the partition setting / design of low-pressure area, medium-pressure area and high-pressure area, the circular screen drum structure and the non-circular double anti-skid key screen drum structure are ingeniously combined, in the non-circular double anti-skid key screen drum structure of the medium-pressure area and the high-pressure area, most of the wear and tear is transferred from the inner wall of the barrel to the anti-skid key strip, the anti-skid key strip is easy to replace, the maintenance cost is low and the maintenance period is short, the use life cycle of the corresponding area barrel and even the whole machine barrel is effectively prolonged, and the maintenance is more easy. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is the structure schematic view of the novel single screw extruder provided by one of the embodiments;

[0037] Figure 2 is the sectional structure schematic view of the non-circular screen drum structure adopted by the embodiment;

[0038] Figure 3 is the sectional structure schematic view of the circular screen drum structure adopted by the embodiment. DETAILED DESCRIPTION

[0039] The utility model will be further described in detail in combination with the embodiments and the drawings, and the following embodiment does not constitute limitation to the utility model.

[0040] Embodiment 1: the novel single screw extruder provided by the embodiment 1, as shown in the drawing, comprises a barrel, a spiral shaft 903 located in the barrel, a feeding port 901 located at one side of the barrel and a discharging port 902 located at the other side of the barrel; Figure 1

[0041] The barrel is sequentially connected by a low-pressure area screen drum structure, a medium-pressure area screen drum structure and a high-pressure area screen drum structure along the material conveying direction;

[0042] The low-pressure area screen drum structure comprises L circular screen drums; wherein L is greater than or equal to 2;

[0043] The medium-pressure area screen drum structure comprises M circular screen drums and N non-circular screen drums; wherein M is greater than or equal to 1, and N is greater than or equal to 1;

[0044] ​The high-pressure area screen drum structure comprises K non-circular screen drums; wherein K≥1.

[0045] wherein L, M, N, K are all natural numbers.

[0046] Specifically, in the present embodiment 1:

[0047] The low-pressure area screen drum structure comprises a first circular screen drum 91 and a second circular screen drum 92 connected in sequence along the material conveying direction;

[0048] The medium-pressure area screen drum structure comprises a third circular screen drum 93 and a first non-circular screen drum 94 connected in sequence along the material conveying direction;

[0049] The high-pressure area screen drum structure comprises a second non-circular screen drum 95.

[0050] The first non-circular screen drum 94 in the medium-pressure area screen drum structure and the second non-circular screen drum 95 in the high-pressure area screen drum structure are both provided with double anti-skid keys. That is, the first non-circular screen drum 94 in the medium-pressure area screen drum structure is provided with double anti-skid keys; and the second non-circular screen drum 95 in the high-pressure area screen drum structure is provided with double anti-skid keys.

[0051] In the present embodiment 1, specifically, the first non-circular screen drum 94 in the medium-pressure area screen drum structure and the second non-circular screen drum 95 in the high-pressure area screen drum structure both adopt the non-circular screen drum structure 10.

[0052] As shown in Figure 2 ( Figure 2 , the helical shaft 903 is not shown), the non-circular screen drum structure 10 comprises a first upper screen hub 11 and a first lower screen hub 12; in each non-circular screen drum structure 10, the inner hole cross section of the first upper screen hub 11 and the first lower screen hub 12 is an incomplete semicircular cross section, and the inner hole horizontal center axis 61 of the first upper screen hub 11 and the inner hole horizontal center axis 62 of the first lower screen hub 12 are separated; the inner hole horizontal center axis of the first upper screen hub 11 and the first lower screen hub 12 are parallel to and do not coincide with the horizontal center axis 60 of the helical shaft 903.

[0053] In the non-circular screen drum structure 10 in the present embodiment 1, as shown in Figure 2As shown, the first anti-skid key strip 41 is clamped between the left side of the first upper screen hub 11 and the left side of the first lower screen hub 12 corresponding thereto; and the second anti-skid key strip 42 is clamped between the right side of the first upper screen hub 11 and the right side of the first lower screen hub 12 corresponding thereto. The non-circular screen drum structure provided with double anti-skid keys, which can also be referred to as a non-circular double anti-skid key screen drum structure, under this structure and configuration, on the one hand, the first upper and lower screen hubs are independent, and on the other hand, the split combination structure is realized through the anti-skid key strips, so that most of the wear and tear is transferred from the inner wall of the cylinder to the anti-skid key strips, the anti-skid key strips are easy to replace, the maintenance cost is low and the maintenance cycle is short, the service life of the cylinder is effectively prolonged, and the cylinder is easy to maintain and can be widely applied in the fields of vegetable and fruit juice squeezing, kitchen waste squeezing, sludge dewatering and squeezing, mechanical pulping and papermaking, etc.

[0054] In each non-circular screen drum structure 10 in the embodiment 1, when the material moves in the space surrounded between the screw groove and the inner walls of the first upper and lower screen hubs, the two anti-skid key strips located on the left and right sides of the inner walls of the first upper and lower screen hubs can be deeply wedged into the expanded and dense material plug, preventing the material plug from rotating with the squeezing screw, and generating relative static with the inner walls of the first upper and lower screen hubs, and then the material plug is scraped and sent along the screw groove of the rotating squeezing screw like a nut, so as to realize the stable and continuous conveying of the material. In the embodiment 1, the cylinder is welded by a plurality of screen plates and skeletons.

[0055] In the non-circular screen drum structure 10 in the embodiment 1, the distance between the inner side surface of the first anti-skid key strip 41 and the outer edge of the screw shaft 903 can be adjusted radially.

[0056] In the non-circular screen drum structure 10 in the embodiment 1, the distance between the inner side surface of the second anti-skid key strip 42 and the outer edge of the screw shaft 903 can be adjusted radially.

[0057] In the non-circular screen drum structure 10 in the embodiment 1, the outer edge of the screw shaft 903 and the radial gaps of the inner wall of the cylinder corresponding thereto are not completely equal; among the radial gaps of the inner wall of the cylinder corresponding to the outer edge of the screw shaft 903, the top gap and the bottom gap are smaller, the two side gaps gradually increase, and the radial gaps are the largest at the positions of the first anti-skid key strip 41 and the second anti-skid key strip 42. In other words, in each non-circular screen drum structure 10: the radial gaps of the inner wall of the cylinder corresponding to the outer edge of the screw shaft 903 gradually increase from the top to the two sides, and gradually decrease from the two sides to the bottom.

[0058] In the embodiment 1, specifically, the screw shaft 903 is a screw shaft whose root diameter gradually changes from thin to thick from the feeding port to the discharging port, the screw groove gradually changes from deep to shallow, and the pitch gradually changes from large to small. In the embodiment 1, the cross section of the root of the screw shaft 903 is circular.

[0059] In this embodiment 1, specifically, the first circular screen drum 91 in the low-pressure zone screen drum structure, the second circular screen drum 92 in the low-pressure zone screen drum structure, and the third circular screen drum 93 in the medium-pressure zone screen drum structure all adopt a circular screen drum structure 20.

[0060] like Figure 3 As shown ( Figure 3 (In the middle, the spiral shaft 903 is not shown), the circular screen drum structure 20 includes a second upper screen hub 21 with a semi-circular inner hole cross-section and a second lower screen hub 22 with a semi-circular inner hole cross-section.

[0061] In each circular screen drum structure 20, the horizontal central axis of the inner hole of the second upper screen hub 21 and the second lower screen hub 22 are parallel to and coincide with the horizontal central axis 60 of the spiral shaft 903.

[0062] In this embodiment 1, specifically, the inner cross-section of the first circular screen drum 91 and the second circular screen drum 92 in the low-pressure zone screen drum structure is a circular cross-section.

[0063] In this embodiment 1, specifically, the inner cross-section of the third circular screen drum 93 in the medium-pressure zone screen drum structure is a circular cross-section.

[0064] In this embodiment 1, specifically, the cross-sectional area of ​​the inner hole of the first non-circular screen drum 94 in the medium-pressure zone screen drum structure is greater than the cross-sectional area of ​​the inner hole of the third circular screen drum 93 in the medium-pressure zone screen drum structure.

[0065] The inner bore cross-sections of the first upper screen hub 11 and the first lower screen hub 12 described in the text are both incomplete semi-circular cross-sections. This can also be described as: the inner bore cross-sections of the first upper screen hub 11 and the first lower screen hub 12 are both incomplete semi-circular cross-sections, which can be an arc-shaped cross-section corresponding to a minor arc, a minor arc arc cross-section, or a similar minor arc arc cross-section, etc. The horizontal central axis 60 of the spiral shaft 903 described in the text can also be referred to as the rotational central axis of the spiral shaft 903. In this embodiment, the horizontal central axis of the barrel coincides with the rotational central axis of the spiral shaft 903.

[0066] The horizontal center axis of the inner hole of the first upper screen hub 11 mentioned in the text can also be referred to as the horizontal center axis of the circle corresponding to the inner hole of the first upper screen hub 11. Similarly, the horizontal center axis of the inner hole of the first lower screen hub 12 mentioned in the text can also be referred to as the horizontal center axis of the circle corresponding to the inner hole of the first lower screen hub 12. The inner wall of the barrel mentioned in the text can also be referred to as the inner wall of the barrel bore, the inner wall of the screen drum, the inner wall of the screen hub, or the inner walls of the upper and lower screen drums or the inner walls of the upper and lower screen hubs.

[0067] The inner hole horizontal center axis of the second upper screen hub 21 can also be referred to as the horizontal center axis of the circle corresponding to the inner hole of the second upper screen hub 21. The inner hole horizontal center axis of the second lower screen hub 22 can also be referred to as the horizontal center axis of the circle corresponding to the inner hole of the second lower screen hub 22.

[0068] The screen drum described herein can also be referred to as a screen hub. The " / " described herein represents "or".

[0069] In the non-circular screen drum structure 10 in Embodiment 1, the vertical distance between the inner hole horizontal center axis 61 of the first upper screen hub 11 and the inner hole horizontal center axis 62 of the first lower screen hub 12 corresponding thereto is greater than 0. That is, in the non-circular screen drum structure 10 in Embodiment 1, the horizontal center axes (i.e., horizontal axis lines) of the corresponding upper and lower inner holes are separated and the vertical distance between them is greater than 0.

[0070] In each non-circular screen drum structure 10 in Embodiment 1, the vertical distance from the upper vertex and the lower vertex of the corresponding barrel inner wall to the barrel horizontal center axis 60 is less than the radius value of the cross section of the inner hole of the first upper screen hub 11 corresponding thereto and the radius value of the cross section of the inner hole of the first lower screen hub 12 corresponding thereto. The radius value of the cross section of the inner hole of the upper and lower screen hubs described herein can also be referred to as the radius value of the circle corresponding to the cross section of the inner hole of the upper and lower screen hubs.

[0071] Embodiment 2: In a new type of single screw extruder provided in Embodiment 2, the first non-circular screen drum 94 in the screen drum structure in the medium pressure zone and the second non-circular screen drum 95 in the screen drum structure in the high pressure zone both adopt the non-circular screen drum structure 10;

[0072] In Embodiment 2, the non-circular screen drum structure 10 includes the first upper screen hub 11 and the first lower screen hub 12. In each non-circular screen drum structure 10 provided in Embodiment 2, the cross section of the inner hole of the first upper screen hub 11 and the first lower screen hub 12 is an inferior arc bow; the first anti-skid key strip 41 is clamped between the left side of the first upper screen hub 11 and the left side of the first lower screen hub 12 corresponding thereto; and the second anti-skid key strip 42 is clamped between the right side of the first upper screen hub 11 and the right side of the first lower screen hub 12 corresponding thereto.

[0073] In Embodiment 2, specifically, the first anti-skid key strip 41 and the second anti-skid key strip 42 are both long strip-shaped anti-skid key strips with a rectangular cross section.

[0074] In Embodiment 2, specifically, the first anti-skid key strip 41 and the second anti-skid key strip 42 are both clamped between the left and right sides of the first upper screen hub 11 and the first lower screen hub 12 corresponding thereto by means of bolt clamping.

[0075] In each of the non-circular screen drum structures 10 provided in Embodiment 2, the inner hole cross section of the machine barrel composed of the first upper screen hub 11 and the first lower screen hub 12 is non-circular.

[0076] In Embodiment 2, the distance between the inner side surface of the first anti-slip key bar 41 and the outer edge of the spiral shaft 903 can be adjusted radially; the distance between the inner side surface of the second anti-slip key bar 42 and the outer edge of the spiral shaft 903 can be adjusted radially.

[0077] In this Embodiment 2, specifically, the minimum diameter of the inner hole cross section of the first non-circular screen drum 94 in the medium-pressure zone screen drum structure is greater than or equal to the diameter of the inner hole cross section of the third circular screen drum 93 in the medium-pressure zone screen drum structure.

[0078] The other structures in Embodiment 2 are basically the same as those in Embodiment 1, and the same parts will not be repeated.

[0079] Taking one of the new single-spiral extrusion pulper provided in Embodiment 2 as an example, the related working principle / working process is illustrated as follows:

[0080] After the material enters the equipment from the feed inlet, firstly enters the low pressure area, and in the low pressure area (corresponding to the circular screen drum structure area) and the front half of the medium pressure area (corresponding to the circular screen drum structure area), the material is axially displaced and transported by the scraping of the screw flight, in the transportation process, the material is extruded by the action of the extrusion force with the volume reduction between the screw blade and the screw shaft, thereby discharging part of the water; further, when the material is transported / moved to the rear half of the medium pressure area (corresponding to the non-circular screen drum structure area), due to the variable pitch and diameter of the compression screw and the change of the volume, the space of the material / slurry advancing direction gradually reduces, based on the structure and configuration of the utility model, when the material / slurry is transported to the medium-high pressure non-circular structure area (corresponding to the non-circular screen drum structure area), the radial gaps of the outer edge of the screw shaft and the inner wall of the cylinder are not completely equal, among the radial gaps of the outer edge of the screw shaft and the inner wall of the cylinder, the top gap and the bottom gap are smaller, the two side gaps gradually increase, the radial gap is the largest at the two key strips, when the material moves in the space surrounded between the screw groove and the inner wall of the first upper and lower screen drums / hub, the two anti-skid key strips on the left and right sides of the inner wall of the first upper and lower screen drums / hub can be deeply wedged into the expanded and dense material plug, prevent the material plug from rotating with the extrusion screw, and generate relative static with the inner wall of the first upper and lower screen drums / hub, then the material plug is axially displaced along the screw groove of the rotating extrusion screw under the scraping of the rotating screw flight, thereby realizing the stable and continuous transportation of the material, and realizing better extrusion concentration of the plant raw material pieces, at the same time, due to the fact that the cross-sectional area of the material plug in the space surrounded by the wedged anti-skid key strip, the inner wall of the first upper and lower screen drums and the outer edge of the screw shaft is several times larger, a larger shear force can be resisted, the problem that the part of the material plug in the screw groove is broken and separated due to shear is not easy to occur, the phenomenon of "rod holding and slipping" can be effectively reduced; overall, the structure is more reasonable and ingenious, while ensuring good effect, the construction cost and maintenance cost of the equipment are greatly reduced, and the utility model can be widely applied.

[0081] The utility model can be used in the technical field of pulping and papermaking, also can be used as the extrusion juicing machinery of fresh vegetables, the extrusion machinery of kitchen waste and sludge dewatering extrusion machinery to improve the concentration and extrusion effect, and has wide application field.

[0082] Taking example of the embodiment 2, when the new single screw extrusion pulper provided by the embodiment 2 is used for extracting black liquor from wheat straw pulp (wheat straw is cooked by the pressure cooking pipe, is discharged to the discharge bin through the outlet pressure relief valve, is pumped to the new single screw extrusion pulper by the medium concentration pump, and the black liquor is extracted by the new single screw extrusion pulper), taking the extraction of black liquor from 65t / d (t / d is ton / day) wheat straw pulp as an example, the single screw main motor power is 90KW, the screw rotating speed is 28r / min, the pulp concentration is 8-10%, and the pulp concentration of the new single screw extrusion pulper can reach about 30-35%.

[0083] The above is only the preferred embodiment of the present application, and it should be pointed out that the above embodiment does not constitute a limitation on the present application, and various changes and modifications made by relevant personnel within the scope of the technical concept of the present application are all within the protection scope of the present application.

Claims

1. A novel single-screw pulping machine, characterized in that: It includes a barrel, a spiral shaft (903) located inside the barrel, a feed inlet (901) located on one side of the barrel, and a discharge outlet (902) located on the other side of the barrel; The barrel is composed of a low-pressure zone screen drum structure, a medium-pressure zone screen drum structure and a high-pressure zone screen drum structure connected sequentially along the material conveying direction; The low-pressure zone screen drum structure includes L circular screen drums; where L≥2; The medium-pressure zone screen drum structure includes M circular screen drums and N non-circular screen drums; where M≥1 and N≥1. The high-pressure zone screen drum structure includes K non-circular screen drums; where K≥1.

2. The novel single-spiral pulping machine as described in claim 1, characterized in that: The low-pressure zone screen drum structure includes a first circular screen drum (91) and a second circular screen drum (92) connected sequentially along the material conveying direction; The medium-pressure zone screen drum structure includes a third circular screen drum (93) and a first non-circular screen drum (94) connected sequentially along the material conveying direction; The high-pressure zone screen drum structure includes a second non-circular screen drum (95).

3. The novel single-spiral pulping machine as described in claim 2, characterized in that: Both the first non-circular screen drum (94) in the medium-pressure zone screen drum structure and the second non-circular screen drum (95) in the high-pressure zone screen drum structure are equipped with double anti-slip keys.

4. The novel single-spiral pulping machine as described in claim 2, characterized in that: The first non-circular screen drum (94) in the medium-pressure zone screen drum structure and the second non-circular screen drum (95) in the high-pressure zone screen drum structure both adopt a non-circular screen drum structure (10). The non-circular screen drum structure (10) includes a first upper screen hub (11) and a first lower screen hub (12); The inner bore cross-sections of the first upper screen hub (11) and the first lower screen hub (12) are both incomplete semi-circular cross-sections, and the horizontal central axis (61) of the inner bore of the first upper screen hub (11) and the horizontal central axis (62) of the inner bore of the first lower screen hub (12) are separated; the horizontal central axes of the inner bores of the first upper screen hub (11) and the first lower screen hub (12) are parallel to and do not coincide with the horizontal central axis (60) of the screw shaft (903).

5. The novel single-spiral pulping machine as described in claim 2, characterized in that: The first non-circular screen drum (94) in the medium-pressure zone screen drum structure and the second non-circular screen drum (95) in the high-pressure zone screen drum structure both adopt a non-circular screen drum structure (10). The non-circular screen drum structure (10) includes a first upper screen hub (11) and a first lower screen hub (12); The inner cross-sections of the first upper screen hub (11) and the first lower screen hub (12) are both inferior arcs.

6. The novel single-spiral pulping machine as described in claim 4 or 5, characterized in that: In each non-circular screen drum structure (10), a first anti-slip key strip (41) is sandwiched between the left side of the first upper screen hub (11) and the left side of the corresponding first lower screen hub (12); a second anti-slip key strip (42) is sandwiched between the right side of the first upper screen hub (11) and the right side of the corresponding first lower screen hub (12).

7. The novel single-screw pulper as described in claim 6, characterized in that: In the non-circular screen drum structure (10), the distance between the inner side of the first anti-slip key strip (41) and the outer edge of the spiral shaft (903) can be adjusted radially; the distance between the inner side of the second anti-slip key strip (42) and the outer edge of the spiral shaft (903) can be adjusted radially; and / or In the non-circular screen drum structure (10), the radial gaps between the outer edge of the spiral shaft (903) and the corresponding inner wall of the cylinder are not completely equal; among the radial gaps between the outer edge of the spiral shaft (903) and the corresponding inner wall of the cylinder, the top and bottom gaps are smaller, and the gaps on both sides gradually increase, reaching the maximum radial gap at the first anti-slip key strip (41) and the second anti-slip key strip (42); and / or The first anti-slip key strip (41) and the second anti-slip key strip (42) are both long strip anti-slip key strips with a rectangular cross section; the first anti-slip key strip (41) and the second anti-slip key strip (42) are both clamped between the left and right sides of the corresponding first upper screen hub (11) and first lower screen hub (12) by bolt clamping and locking.

8. The novel single-screw pulping machine as described in claim 1, characterized in that: The spiral shaft (903) is a spiral shaft whose root diameter gradually increases from the inlet to the outlet, whose spiral groove gradually decreases from the depth to the shallowness, and whose spiral pitch gradually decreases from the large to the small.

9. The novel single-spiral pulping machine as described in claim 2, characterized in that: The first circular screen drum (91) and the second circular screen drum (92) in the low-pressure zone screen drum structure, as well as the third circular screen drum (93) in the medium-pressure zone screen drum structure, all adopt a circular screen drum structure (20). The circular screen drum structure (20) includes a second upper screen hub (21) with a semi-circular inner cross-section and a second lower screen hub (22) with a semi-circular inner cross-section.

10. The novel single-spiral pulping machine as described in claim 2, characterized in that: The inner cross-sections of the first circular screen drum (91) and the second circular screen drum (92) in the low-pressure zone screen drum structure are both circular. The inner cross-section of the third circular screen drum (93) in the medium-pressure zone screen drum structure is circular. The cross-sectional area of ​​the inner hole of the first non-circular screen drum (94) in the medium-pressure zone screen drum structure is greater than the cross-sectional area of ​​the inner hole of the third circular screen drum (93) in the medium-pressure zone screen drum structure.

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