Screw conveyer

Abstract

The present disclosure relates to a screw conveyor. The spiral conveyor comprises a main shell, a feeding channel, a discharging channel and a spiral body, the spiral body and the main shell are coaxially arranged, the axis of the feeding channel is perpendicular to a rotating shaft of the spiral body, and the axis of the discharging channel is perpendicular to the rotating shaft of the spiral body; the axis of the feeding channel is parallel to the axis of the discharging channel, and the axis of the feeding channel is staggered from the axis of the discharging channel. The spiral body comprises a blade spirally arranged in the axis direction of the spiral body, a first shaft section arranged at the end, close to the feeding channel, of the blade in the axis direction and a second shaft section arranged at the end, close to the discharging channel, of the blade in the axis direction. The blades, the first shaft section and the second shaft section are coaxially arranged, and the first shaft section is in transmission connection with the power mechanism so that the power mechanism can drive the blades to rotate around the axes of the blades through the first shaft section. According to the spiral conveyor, adhesion or winding of materials on the spiral shaft can be reduced, and therefore the conveying efficiency of the spiral conveyor is improved to a certain degree.

Description

Technical Field

[0001] This disclosure relates to the field of engineering equipment, and more specifically, to a screw conveyor. Background Technology

[0002] A screw conveyor is a machine that uses a motor and reducer to drive a screw to rotate, thus pushing materials to achieve the purpose of conveying. Screw conveyors can transport materials horizontally, inclined, or vertically, and are characterized by simple structure, convenient operation, easy maintenance, and suitability for enclosed transport. Currently, screw conveyors are widely used in various industries, such as the grain industry, building materials industry, chemical industry, machinery manufacturing industry, and transportation industry, among other sectors of the national economy.

[0003] Existing screw conveyors are prone to sticking or tangling with perishable, sticky, easily agglomerated, or easily entangled materials when conveying them, resulting in a significant reduction in conveying efficiency.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this disclosure is to provide a screw conveyor that can reduce the adhesion or entanglement of materials on the screw shaft, thereby improving the conveying efficiency of the screw conveyor to a certain extent.

[0006] This disclosure provides a screw conveyor, including a main housing, a feed channel, a discharge channel, and a screw body. The screw body is coaxially arranged with the main housing. The axis of the feed channel is perpendicular to the rotation axis of the screw body, and the axis of the discharge channel is perpendicular to the rotation axis of the screw body. The axes of the feed channel and the discharge channel are parallel and offset from each other.

[0007] The spiral body includes blades spirally arranged along its own axis, a first shaft section located near the feed channel on the blade axis, and a second shaft section located near the discharge channel on the blade axis. The blades, the first shaft section, and the second shaft section are coaxially arranged. The first shaft section is connected to a power mechanism for transmission, so that the power mechanism drives the blades to rotate around its own axis through the first shaft section.

[0008] In one exemplary embodiment of this disclosure, the first shaft segment, the feed channel, and the discharge channel are arranged sequentially along the axial direction of the spiral body, wherein the first shaft segment and the feed channel are offset in the axial direction of the spiral body.

[0009] In one exemplary embodiment of this disclosure, the feed channel, the discharge channel, and the second shaft section are arranged sequentially along the axial direction of the spiral body, wherein the second shaft section and the discharge channel partially overlap in the axial direction of the spiral body.

[0010] In one exemplary embodiment of this disclosure, the blade includes a first helical blade spiraling in a first direction and a second helical blade spiraling in a second direction, and the first shaft segment, the first helical blade, the second helical blade and the second shaft segment are arranged sequentially along the axis of the helical body;

[0011] The end of the first helical blade furthest from the second helical blade is coiled around the first shaft segment, and the end of the second helical blade furthest from the first helical blade is coiled around the second shaft segment. The helical directions of the first and second directions are opposite.

[0012] In one exemplary embodiment of this disclosure, the second helical blade is wound around the axis of the helical body at an angle of not less than 90 degrees.

[0013] In one exemplary embodiment of this disclosure, the end of the second helical blade near the first helical blade is also coiled around the second shaft segment. The first helical blade, the discharge channel, and the second helical blade are arranged sequentially along the blade axis direction, and the second helical blade and the discharge channel partially overlap in the blade axis direction.

[0014] In one exemplary embodiment of this disclosure, the first helical blade and the second helical blade are not in contact.

[0015] In one exemplary embodiment of this disclosure, the screw conveyor further includes a support base located on the opposite side of the feed channel on the main housing.

[0016] In one exemplary embodiment of this disclosure, a bearing seat is provided at one end of the main housing near the discharge channel, and the second shaft segment is rotatably supported in the bearing seat.

[0017] In one exemplary embodiment of this disclosure, an end cap is provided at one end of the main housing near the feed channel. The end cap closes the opening at one end of the main housing near the feed channel, and the first shaft segment extends out of the main housing from the end cap.

[0018] The end cap and the first shaft section are provided with packing material, and the end cap is provided with a pressure cap on the side away from the main housing. The pressure cap seals the packing material between the end cap and the first shaft section.

[0019] The screw conveyor disclosed herein has a first shaft section and a second shaft section respectively located at opposite ends of the blades. The blades have blade segments without shafts, so that there are no attachment points for materials. During the material conveying process, the screw can clean the material adhering to the blades during rotation, which has a self-cleaning effect. This can prevent wet materials from adhering to the blades and shafts during transportation, causing blockage inside the main casing and affecting material conveying, thereby improving the conveying efficiency of the screw conveyor. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0021] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0022] Figure 1 This is a schematic diagram of an exemplary embodiment of the screw conveyor disclosed herein.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Main shell; 2. Feed channel; 3. Discharge channel; 4. Spiral body; 41. Blade; 411. First spiral blade; 412. Second spiral blade; 42. First shaft section; 43. Second shaft section; 5. Support seat; 6. Bearing seat; 7. End cover; 71. Packing; 72. Pressure cover; 8. Baffle cover. Detailed Implementation

[0025] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0026] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The use of terms such as "first" and "second" in this disclosure is for illustrative purposes only and is not intended to limit the number, importance, or order of the objects. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "connection," "fixed," etc., shall be interpreted broadly; for example, "connection" can be a fixed connection, a movable connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection via an intermediate medium.

[0027] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are merely used to indicate relative positional relationships. For convenience, the description is based on the actual position and state of the screw conveyor during use, or on the angles shown in the accompanying drawings, and should not be construed as limiting the exemplary embodiments of this disclosure. In the exemplary embodiments of this disclosure, the "starting point" and "ending point" of each component of the screw conveyor are defined by the material conveying direction, i.e., the direction from the feed channel 2 to the discharge channel 3. For example, the direction from the "starting point" to the "ending point" of the main housing 1 is the direction from the feed channel 2 to the discharge channel 3.

[0028] The term "misaligned" for components A and B in this disclosure refers to components A and B not coinciding. For example, if the axes of feed channel 2 and discharge channel 3 are misaligned, it means that the axes of feed channel 2 and discharge channel 3 do not coincide; similarly, if the first shaft segment 42 is misaligned with feed channel 2, it means that the first shaft segment 42 and feed channel 2 do not overlap. However, it should be noted that the disclosure of "misaligned" components A and B does not exclude the extreme case where the edges of components A and B overlap. In practical applications, those skilled in the art will understand that due to the upper limits of manufacturing processes and testing accuracy, the descriptions of positional relationships such as "misaligned," "parallel," and "perpendicular" in this disclosure may not be error-free during testing. For example, two parallel components may have a very small included angle, and two misaligned components may have a very small overlapping area. As long as it is within the error range allowed by manufacturing and measurement accuracy, it should still be considered to have this positional relationship.

[0029] Existing screw conveyors are suitable for conveying non-sticky powdery, granular, and small lump materials, such as cement, fly ash, lime, and grain. However, when conveying perishable, sticky, easily agglomerated, or easily entangled materials, the materials tend to stick or become entangled on the screw shaft, resulting in a significant reduction in conveying efficiency. In severe cases, it may be necessary to stop the conveyor for cleaning.

[0030] To address the aforementioned problems, this disclosure provides a screw conveyor, with reference to... Figure 1As shown, the screw conveyor includes a main housing 1, a feed channel 2, a discharge channel 3, and a screw 4. The screw 4 is coaxially arranged with the main housing 1. The axis of the feed channel 2 is perpendicular to the rotation axis of the screw 4, and the axis of the discharge channel 3 is perpendicular to the rotation axis of the screw 4. The axes of the feed channel 2 and the discharge channel 3 are parallel and offset from each other. The screw 4 includes blades 41 spirally arranged along its own axis, a first shaft section 42 located near the feed channel 2 along the axis of the blades 41, and a second shaft section 43 located near the discharge channel 3 along the axis of the blades 41. The blades 41, the first shaft section 42, and the second shaft section 43 are coaxially arranged. The first shaft section 42 is connected to a power mechanism for transmission, so that the power mechanism drives the blades 41 to rotate around its own axis through the first shaft section 42.

[0031] When using the screw conveyor of this disclosure to convey materials, a power mechanism, such as a motor, drives the first shaft section 42 to rotate, which in turn drives the screw body 4 to rotate around its own axis. The material enters the main housing 1 from the feed channel 2. Through the rotation of the screw body 4, the blades 41 agitate the material. Since the blades 41 are spirally arranged, the material can be conveyed from the feed channel 2 to the discharge channel 3 during the rotation of the blades 41. The material leaves the main housing 1 from the discharge channel 3.

[0032] The screw conveyor disclosed herein has a first shaft section 42 and a second shaft section 43 respectively located at opposite ends of the blade 41. The blade 41 has blade segments without shafts, so that there are no attachment points for materials. During the material conveying process, the screw 4 can clean the material adhering to the blade 41 during rotation, which has a self-cleaning effect. This can prevent wet materials from adhering to the blade 41 and shaft during transportation, causing blockage inside the main housing 1 and affecting material conveying, thereby improving the conveying efficiency of the screw conveyor.

[0033] In one exemplary embodiment of this disclosure, the first shaft segment 42, the feed channel 2, and the discharge channel 3 are arranged sequentially along the axial direction of the spiral body 4, wherein the first shaft segment 42 and the feed channel 2 are offset from each other along the axial direction of the spiral body 4. (See reference...) Figure 1 As shown, after the material enters the main housing 1 from the feed channel 2, it can fall directly onto the blade 41, that is, directly onto the shaftless section of the spiral body 4, and be conveyed towards the discharge channel 3 as the blade 41 rotates, further reducing the risk of wet material sticking or tangling in the first shaft section 42.

[0034] It should be noted that the feed channel 2 or the discharge channel 3 can be a cylindrical channel, a square channel, or other regular or irregular shaped channels. The "axis of feed channel 2 / discharge channel 3" mentioned in this disclosure can refer to the center line of feed channel 2 / discharge channel 3. The "axis of screw 4 / blade 41" mentioned in this disclosure can refer to the screw shaft of screw 4 / blade 41. Those skilled in the art will understand that the "axis" mentioned in this disclosure is actually virtual and is only used to facilitate the description of the screw conveyor's structure. In one exemplary embodiment of this disclosure, feed channel 2, discharge channel 3, and second shaft segment 43 are arranged sequentially along the axial direction of screw 4, wherein the second shaft segment 43 and discharge channel 3 partially coincide along the axial direction of screw 4. (Reference) Figure 1 As shown, for the spiral 4 opposite to the discharge channel 3, the end of the blade 41 near the second shaft section 43 is opposite to the discharge channel 3, and the end of the second shaft section 43 near the blade 41 is opposite to the discharge channel 3. In another exemplary embodiment of this disclosure, the discharge channel 3 and the second shaft section 43 may also be offset in the axial direction of the spiral 4.

[0035] In one exemplary embodiment of this disclosure, the blade 41 includes a first helical blade 411 spiraling in a first direction and a second helical blade 412 spiraling in a second direction. The first shaft segment 42, the first helical blade 411, the second helical blade 412 and the second shaft segment 43 are arranged sequentially along the axial direction of the helical body 4. The end of the first helical blade 411 away from the second helical blade 412 is coiled around the first shaft segment 42, and the end of the second helical blade 412 away from the first helical blade 411 is coiled around the second shaft segment 43. The helical directions of the first direction and the second direction are opposite.

[0036] Specifically, refer to Figure 1 As shown, the feed channel 2 is close to the beginning of the main housing 1, and the discharge channel 3 is close to the end of the main housing 1. The second helical blade 412 is located near the discharge channel 3. Since the rotation direction of the second helical blade 412 is opposite to that of the first helical blade 411, that is, if the rotation direction of the first helical blade 411 is left-handed, then the rotation direction of the second helical blade 412 is right-handed; if the rotation direction of the first helical blade 411 is right-handed, then the rotation direction of the second helical blade 412 is left-handed. The first helical blade 411 is used to push the material from the feed channel 2 to the discharge channel 3 during rotation. The specific rotation direction of the first helical blade 411 can be determined according to the direction from the feed channel 2 to the discharge channel 3. The rotation direction of the second helical blade 412 is opposite to that of the first helical blade 411. Therefore, the direction of the pushing force of the second helical blade 412 on the material is opposite to the direction of the pushing force of the first helical blade 411 on the material. That is, the second helical blade 412 is used to push the material from the discharge channel 3 to the feed channel 2 during rotation, thereby preventing the material from accumulating at the end of the main shell 1. The blade 41 can be formed by integral cold pressing.

[0037] In one exemplary embodiment of this disclosure, the second helical blade 412 is wound around the axis of the helical body 4 at an angle of not less than 90 degrees, so that the second helical blade 412 can forcefully roll the material at the end of the main housing 1 forward. For example, referring to... Figure 1 As shown, the number of turns of the second helical blade 412 around the axis of the helical body 4 can be less than the number of turns of the first helical blade 411 around the axis of the helical body 4, so that the second helical blade 412 only serves to prevent material from accumulating inside the main housing 1, without hindering the material from leaving the main housing 1 through the discharge channel 3. For example, the angle of the second helical blade 412 around the axis of the helical body 4 can be from 90 degrees to 180 degrees.

[0038] In one exemplary embodiment of this disclosure, the end of the second helical blade 412 near the first helical blade 411 is also coiled around the second shaft section 43. The first helical blade 411, the discharge channel 3, and the second helical blade 412 are arranged sequentially along the axial direction of the blade 41, and the second helical blade 412 and the discharge channel 3 partially overlap in the axial direction of the blade 41. Specifically, for the spiral body 4 opposite to the discharge channel 3, the end of the first helical blade 411 near the second shaft section 43 is opposite to the discharge channel 3, and the end of the second shaft section 43 near the blade 41 is opposite to the discharge channel 3. The second helical blade 412 coiled around the second shaft section 43 extends from the tail end of the main housing 1 to the discharge channel 3, so that the second helical blade 412 can roll the material at the end of the main housing 1 to the discharge channel 3, so that it flows out from the discharge channel 3, ensuring that no material accumulates at the end of the main housing 1.

[0039] In another exemplary embodiment of this disclosure, reference is made to Figure 1 As shown, the edge of the second helical blade 412 near the first helical blade 411 is flush with the edge of the discharge channel 3 away from the feed channel 2 in the axial direction of the blade 41.

[0040] In another exemplary embodiment, the second helical blade 412 and the discharge channel 3 can be offset in the axial direction of the blade 41. That is, the second helical blade 412 is coiled around the second shaft section 43 on the side of the discharge channel 3 away from the feed channel 2, that is, the side closer to the end of the main housing 1. This makes the second helical blade 412 only serve to prevent the material from accumulating at the rear end of the discharge channel 3 in the main housing 1, without hindering the material from leaving the main housing 1 from the discharge channel 3.

[0041] The second helical blade 412 is coiled around the second shaft section 43 on the side of the discharge channel 3 away from the feed channel 2. For example, the second helical blade 412 is coiled around the second shaft section 43 after the discharge channel 3 and before the bearing seat 6 at the end of the main housing 1.

[0042] In one exemplary embodiment of this disclosure, the first helical blade 411 and the second helical blade 412 are not in contact. Specifically, refer to... Figure 1 As shown, the first helical blade 411 and the second helical blade 412 are not in direct contact. In one embodiment, for example, the vertex of the first helical blade 411 near the second helical blade 412 and the vertex of the second helical blade 412 near the first helical blade 411 are coplanar with the axis of the helical body 4. The first helical blade 411 and the second helical blade 412 are 180 degrees apart circumferentially in the helical body 4. This allows the second helical blade 412 to prevent material accumulation without affecting the pushing effect of the first helical blade 411 on the material, thus avoiding affecting the flow direction of the material.

[0043] In one exemplary embodiment of this disclosure, the screw conveyor further includes a support base 5, which is disposed on the opposite side of the feed channel 2 on the main housing 1. The support base 5 provides support for the main housing 1, and multiple support bases 5 may be provided. Exemplarily, one support base 5 may be coaxial with the feed channel 2. (See reference...) Figure 1 As shown, the support seat 5 provides strong support for the main shell 1 at the feed channel 2, preventing the weight of the hopper from affecting the strength and rigidity of the main shell 1 when the feed channel 2 is directly connected to the hopper; or preventing the weight of the material from affecting the strength and rigidity of the main shell 1 when a large amount of material enters the screw conveyor main shell 1 from the feed channel 2.

[0044] In one exemplary embodiment of this disclosure, the screw conveyor may also include multiple auxiliary feeding channels and multiple auxiliary discharging channels between the feeding channel 2 and the discharging channel 3, thereby enabling multi-point loading and unloading, making the screw conveyor more convenient and flexible to use.

[0045] In one exemplary embodiment of this disclosure, reference is made to Figure 1 As shown, a bearing seat 6 is provided at one end of the main housing 1 near the discharge channel 3, and the second shaft section 43 is rotatably supported in the bearing seat 6. The second shaft section 43 is rotatably connected to the end of the main housing 1 near the discharge channel 3. The bearing seat 6 can effectively prevent the screw 4 from contacting the main housing 1, thereby increasing the service life of the main housing 1 and the screw 4.

[0046] In one exemplary embodiment of this disclosure, an end cap 7 is provided at one end of the main housing 1 near the feed channel 2. The end cap 7 closes the opening at one end of the main housing 1 near the feed channel 2, and the first shaft segment 42 extends out of the main housing 1 from the end cap 7. A filler 71 is provided between the end cap 7 and the first shaft segment 42, and a pressure cap 72 is provided on the side of the end cap 7 away from the main housing 1. The pressure cap 72 seals the filler 71 between the end cap 7 and the first shaft segment 42.

[0047] Specifically, refer to Figure 1As shown, end cap 7 is used to close the opening of the main housing 1 near the feed channel 2. A first shaft segment 42 is rotatably connected to end cap 7. The first shaft segment 42 extends out of the main housing 1 from end cap 7 and can be driven by a power mechanism, such as the output shaft of a motor, so that the power mechanism drives the blade 41 to rotate around its own axis via the first shaft segment 42. A radial gap exists between end cap 7 and the first shaft segment 42, opening towards the side away from the main housing 1. Packing 71 fills this radial gap to enhance the sealing effect between the relatively rotating first shaft segment 42 and end cap 7. The gland 72 can be connected to the end cover 7 on the side away from the main housing 1 by bolts. The gland 72 has a clamping end that can extend into the radial gap between the end cover 7 and the first shaft section 42. By adjusting the depth to which the connecting bolts of the gland 72 and the end cover 7 are screwed into the end cover 7, the length of the clamping end of the gland 72 extending into the radial gap between the end cover 7 and the first shaft section 42 can be changed, thereby changing the compaction degree of the packing 71, so that the sealing effect of the packing 71 between the first shaft section 42 and the end cover 7 can be optimized.

[0048] In one exemplary embodiment of this disclosure, a baffle 8 is also provided at the end of the main housing 1, that is, the rear end of the bearing seat 6 (the side of the bearing seat 6 away from the discharge channel 3), as shown in the reference. Figure 1 As shown, the baffle 8 is used to close the end opening of the main housing 1, that is, the opening of the main housing 1 near the discharge channel 3.

[0049] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0050] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A screw conveyor, characterized in that The device comprises a main shell (1), a feeding channel (2), a discharging channel (3) and a spiral body (4), the spiral body (4) is coaxially arranged with the main shell (1), the axis of the feeding channel (2) is perpendicular to the rotation axis of the spiral body (4), the axis of the discharging channel (3) is perpendicular to the rotation axis of the spiral body (4), the axes of the feeding channel (2) and the discharging channel (3) are parallel, and the axes of the feeding channel (2) and the discharging channel (3) are staggered. The spiral body (4) comprises blades (41) spirally arranged along the axis direction of the spiral body (4), a first shaft segment (42) arranged near one end of the feeding channel (2) along the axis direction of the blades (41) and a second shaft segment (43) arranged near one end of the discharging channel (3) along the axis direction of the blades (41), the blades (41), the first shaft segment (42) and the second shaft segment (43) are coaxially arranged, the first shaft segment (42) is in transmission connection with a power mechanism, so that the power mechanism drives the blades (41) to rotate around the axis of the spiral body (4) through the first shaft segment (42).

2. A screw conveyor according to claim 1, characterized in that The first shaft segment (42), the feeding channel (2) and the discharging channel (3) are sequentially arranged along the axis direction of the spiral body (4), wherein the first shaft segment (42) and the feeding channel (2) are staggered along the axis direction of the spiral body (4).

3. The screw conveyor of claim 1, wherein, The feeding channel (2), the discharging channel (3) and the second shaft segment (43) are sequentially arranged along the axis direction of the spiral body (4), wherein the second shaft segment (43) and the discharging channel (3) partially coincide along the axis direction of the spiral body (4).

4. The screw conveyor of claim 1, wherein, The blades (41) comprise first spiral blades (411) spirally arranged along a first direction and second spiral blades (412) spirally arranged along a second direction, the first shaft segment (42), the first spiral blades (411), the second spiral blades (412) and the second shaft segment (43) are sequentially arranged along the axis direction of the spiral body (4). The first spiral blades (411) are wound on the first shaft segment (42) at one end away from the second spiral blades (412), the second spiral blades (412) are wound on the second shaft segment (43) at one end away from the first spiral blades (411), and the spiral directions of the first direction and the second direction are opposite.

5. A screw conveyor according to claim 4, characterised in that The second spiral blades (412) are wound along the axis direction of the spiral body (4) by an angle not less than 90 degrees.

6. The screw conveyor of claim 4, wherein, The second spiral blades (412) are also wound on the second shaft segment (43) at one end close to the first spiral blades (411), the first spiral blades (411), the discharging channel (3) and the second spiral blades (412) are sequentially arranged along the axis direction of the blades (41), and the second spiral blades (412) and the discharging channel (3) partially coincide along the axis direction of the blades (41).

7. The screw conveyor of claim 4, wherein, The first spiral blades (411) and the second spiral blades (412) are not connected.

8. A screw conveyor according to any one of claims 1 to 7, characterized in that The screw conveyor further comprises a supporting seat (5) arranged on the main housing (1) at the side opposite to the feeding channel (2).

9. A screw conveyor according to any one of claims 1 to 7, characterized in that An end of the main housing (1) close to the discharging channel (3) is provided with a bearing seat (6), and the second shaft segment (43) is rotatably supported in the bearing seat (6).

10. A screw conveyor according to any one of claims 1 to 7, characterized in that An end of the main housing (1) close to the feeding channel (2) is provided with an end cover (7) which closes the opening of the main housing (1) at the end close to the feeding channel (2), and the first shaft segment (42) passes out of the main housing (1) from the end cover (7). Wherein, a filler (71) is arranged between the end cover (7) and the first shaft segment (42), and a gland (72) is arranged on the side of the end cover (7) away from the main housing (1), and the gland (72) closes the filler (71) between the end cover (7) and the first shaft segment (42).

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