Spiral feeding device of solid-liquid separation thickener

Abstract

The invention discloses a spiral feeding device of a solid-liquid separation thickener, which comprises an annular cylindrical feeding well, the inner side of the annular cylindrical feeding well is a vertically through dilution column cavity, one side of the upper end of the annular cylindrical feeding well is fixedly connected with a feeding pipe along the tangential direction, and the leading-out end of the feeding pipe is communicated with the inner side of the annular cylindrical feeding well along the tangential direction; a spiral retention guide vane which spirals spirally is integrally arranged on the inner wall of the annular cylindrical feeding well and divides the circumferential edge space of the dilution column cavity into a spiral material retention guide channel; the leading-out end of the material pipe is communicated with the spiral upper end of the spiral material retention flow guide channel, and the spiral lower end of the spiral material retention flow guide channel is a tail end outlet of the spiral flow guide flow channel; and different initial flow speeds in the feeding pipe can be self-adapted.

Description

Technical Field

[0001] The invention belongs to the field of feeding of thickeners. Background Art

[0002] The feed well of the thickener has two functions. The first is to prevent the slurry material introduced into the thickener from directly impacting the settled material inside the thickener, so as to prevent the formed floccules from being destroyed and causing the overflow liquid to become turbid. The second is to retain and drain the slurry material introduced into the thickener so that the flow path is long enough to allow the material to be fully mixed with the flocculant and dilution liquid in the thickener settling tank. In the existing structure, the above two functions are achieved by applying spiral guide vanes to the inner wall of the feed well. The specific working principle is described in detail in the specification of this case.

[0003] When the initial feeding speed of the material is too fast, the initial flow rate given by the feed pipe is too fast, resulting in the jet intensity discharged from the end outlet of the spiral guide flow channel is still relatively high. The jet discharged from the end outlet of the spiral guide flow channel will still directly impact the settled material inside the thickener tank at a relatively high speed, destroying the formed flocs and causing the overflow liquid above to become turbid. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a spiral feeding device for a solid-liquid separation thickener, which can adapt to different initial flow rates in a feed pipe.

[0005] Technical solution: To achieve the above-mentioned purpose, a spiral feeding device of a solid-liquid separation thickener of the present invention comprises an annular feeding well, the inner side of the annular feeding well is a dilution column cavity which passes through from top to bottom, a feeding pipe is fixedly connected to one side of the upper end of the annular feeding well along the tangential direction, and the outlet end of the feeding pipe is connected to the inner side of the annular feeding well along the tangential direction; a spiral retention guide blade which is spirally coiled is integrally provided on the inner wall of the annular feeding well, and the spiral retention guide blade divides the circumferential edge space of the dilution column cavity into a spiral material retention guide channel; the outlet end of the material pipe is connected to the spiral upper end of the spiral material retention guide channel, and the spiral lower end of the spiral material retention guide channel is the terminal outlet of the spiral guide flow channel.

[0006] Furthermore, the spiral retention guide vane includes an upper spiral retention guide vane and a lower spiral retention guide vane; the spiral extension lines of the upper spiral retention guide vane and the lower spiral retention guide vane are both on the path of the same cylindrical spiral line;

[0007] An adaptive fluid momentum counteracting unit is arranged between the spiral lower end of the upper spiral retention guide vane and the spiral upper end of the lower spiral retention guide vane.

[0008] Furthermore, the material flowing downward in the spiral material retention guide channel has a low flow rate state and a high flow rate state. In the low flow rate state, the adaptive fluid momentum hedging unit does not take action. In the high flow rate state, the adaptive fluid momentum hedging unit takes the initiative to act and offset and reduce the momentum of the material discharged from the outlet at the end of the spiral guide channel.

[0009] Furthermore, the spiral lower end of the upper spiral retention guide blade is integrally connected with an upwardly tilted plate that is inclined upward.

[0010] Further, when the adaptive fluid momentum counteracting unit includes a torsion shaft, a guide swing plate and a fixed guide plate;

[0011] The torsion shaft is close to the upper end of the spiral structure of the lower spiral retention guide blade, and the axis of the torsion shaft extends along the radial direction of the annular feeding well; the torsion shaft and the bearing hole on the wall of the annular feeding well are rotatably matched through the bearing; the root of the guide swing piece is integrally fixed on the torsion shaft, and the root of the fixed guide piece is fixed on the lower side of the upper end of the spiral structure of the lower spiral retention guide blade; the end of the guide swing piece extends obliquely upward, and the end of the fixed guide piece extends obliquely downward; the upper seesaw is between the guide swing piece and the fixed guide piece; under normal conditions, the lower surface of the guide swing piece rests on the oblique upper end of the upper seesaw, and a ">"-shaped water inlet is formed between the lower surface of the upper section of the guide swing piece and the upper surface of the upper seesaw, and the opening direction of the ">"-shaped water inlet is opposite to the liquid flow direction in the spiral material retention guide channel at the location;

[0012] A downward oblique counter-flow channel is formed between the fixed guide plate and the upward swing plate, and the oblique lower end of the counter-flow channel corresponds to the terminal outlet of the spiral guide channel; the jet flowing obliquely downward along the counter-flow channel counter-flows the jet discharged from the terminal outlet of the spiral guide channel.

[0013] Furthermore, one end of the torsion shaft extends out of the outside of the annular feeding well, and a torsion plate is fixedly connected to one end of the torsion shaft outside the annular feeding well. A torsion spring or a torsion applying device is arranged outside a section of the torsion shaft outside the annular feeding well; the torsion spring applies a counterclockwise torque to the torsion shaft, so that the lower surface of the guide swing plate is tightly resting on the inclined upper end of the upper rocker plate.

[0014] Furthermore, when the guide swing piece rotates upward clockwise for a certain angle along with the torque shaft, the guide swing piece separates from the upper swing plate, the ">"-shaped water-facing opening expands and is converted into the entrance of the counter-hedging channel; after the ">"-shaped water-facing opening expands and is converted into the entrance of the counter-hedging channel, the inner end of the entrance of the counter-hedging channel is connected to the oblique upper end of the counter-hedging channel; at the same time, a section of the spiral material retention guide channel on the upper side of the guide swing piece becomes relatively narrower.

[0015] Furthermore, a limiting protrusion is provided on the upper side of the torsion shaft, and when the torsion shaft rotates clockwise by a certain angle, the limiting protrusion contacts the spiral upper end of the lower spiral retention guide vane.

[0016] Beneficial effect: When the flow rate in the feed pipe is too high, the guide swing plate is separated from the upward swing plate, the ">"-shaped water inlet expands and is converted into the entrance of the counter-hedge channel; after the ">"-shaped water inlet expands and is converted into the entrance of the counter-hedge channel, the inner end of the entrance of the counter-hedge channel is connected to the oblique upper end of the counter-hedge channel; at the same time, a section of the spiral material retention guide channel on the upper side of the guide swing plate becomes relatively narrow, and at this time, the jet flowing obliquely downward along the counter-hedge channel and the jet discharged from the terminal outlet of the spiral guide flow channel are counteracted, thereby further weakening the jet intensity discharged from the terminal outlet of the spiral guide flow channel, thereby avoiding the slurry material discharged from the terminal outlet of the spiral guide flow channel directly impacting the settled material inside the thickener concentration tank at high speed, so as to prevent the formed floccules from being destroyed and causing the overflow liquid to become turbid;

[0017] When the flow rate or flow in the feed pipe is low or moderate:

[0018] The guide swing plate does not make any movement, and the slurry material can smoothly move along the single guide channel. During the entire process of the slurry material moving along the spiral downward path of the spiral material retention guide channel, it is continuously mixed and blended with the liquid and flocculant in the dilution column cavity under the continuous rolling shearing action. The "first situation" will not occur in which a part of the slurry liquid directly reaches the end outlet of the spiral guide channel through the "shortcut" of the "hedge channel", which leads to insufficient mixing and blending with the flocculant. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the device;

[0020] Figure 2 It is a side view of the device;

[0021] Figure 3 For Figure 2 A schematic diagram of the internal structure of the improved annular feeding well based on the present invention, wherein the feeding pipe, the bracket and the inner and outer edge structures of the upper and lower ends of the annular feeding well are hidden in this figure;

[0022] Figure 4 for Figure 3 An enlarged schematic diagram of the mark 6;

[0023] Figure 5 for Figure 4 A cross-sectional view of

[0024] Figure 6 The sectional views are for the “initial state” and the “second case”;

[0025] Figure 7 for Figure 6 Stereoscopic image of

[0026] Figure 8 This is the cross-sectional view for the “first case”. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] As attached Figures 1 to 7 The spiral feeding device of a solid-liquid separation thickener comprises an annular feeding well 3, the inner side of the annular feeding well 3 is a dilution column cavity 4 which passes through from top to bottom. The annular feeding well 3 of the present scheme is coaxially fixedly arranged on the upper part of the thickener's thickening tank, and at least the lower part of the annular feeding well 3 is immersed in the thickener's thickening tank; one side of the upper end of the annular feeding well 3 is fixedly connected with a feed pipe 2 in a tangential direction, and the outlet end of the feed pipe 2 is connected to the inner side of the annular feeding well 3 in a tangential direction; the inner wall of the annular feeding well 3 is integrally provided with a spirally spiraling spiral retention guide blade 1, and the spiral retention guide blade 1 divides the circumferential edge space of the dilution column cavity 4 into a spiral material retention guide channel 5; the outlet end of the feed pipe 2 is connected to the spiral upper end of the spiral material retention guide channel 5, and the spiral lower end of the spiral material retention guide channel 5 is the terminal outlet 10 of the spiral guide flow channel.

[0029] Although the spiral path of the spiral material retention guide channel 5 of the above structure causes significant momentum consumption of the fluid flowing through, the initial flow rate given by the feed pipe 2 is too fast, resulting in the jet intensity discharged from the terminal outlet 10 of the spiral guide channel is still relatively high, and the jet discharged from the terminal outlet 10 of the spiral guide channel will still directly impact the settled materials inside the thickener concentration tank at a relatively high speed, destroying the formed floccules and causing the overflow liquid above to become turbid; if enough resistance structures are added to the spiral material retention guide channel 5, the momentum of the liquid in the spiral material retention guide channel 5 will be consumed prematurely, and the flow problem of the entire spiral flow path cannot be completed; therefore, the following improved structure is proposed:

[0030] like Figures 3 to 8As shown, the spiral retention guide blade 1 includes an upper spiral retention guide blade 1a and a lower spiral retention guide blade 1b; the spiral extension lines of the upper spiral retention guide blade 1a and the lower spiral retention guide blade 1b are both on the path of the same cylindrical spiral line; an adaptive fluid momentum offset unit 6 is arranged between the spiral lower end of the upper spiral retention guide blade 1a and the spiral upper end of the lower spiral retention guide blade 1b; the material flowing downward in the spiral flow channel along the spiral material retention guide channel 5 has a low flow rate state and a high flow rate state. In the low flow rate state, the adaptive fluid momentum offset unit 6 does not act, and in the high flow rate state, the adaptive fluid momentum offset unit 6 actively acts and offsets and reduces the momentum of the material discharged from the outlet 10 at the end of the spiral guide channel.

[0031] The specific structure is as follows Figures 4 to 8 As shown:

[0032] An upwardly tilted plate 8 is integrally connected to the spiral lower end of the upper spiral retention guide vane 1 a.

[0033] When the adaptive fluid momentum counteracting unit 6 includes a torsion shaft 15, a guide swing plate 9 and a fixed guide plate 16;

[0034] The torsion shaft 15 is close to the upper end of the spiral structure of the lower spiral retention guide blade 1b, and the axis of the torsion shaft 15 extends along the radial direction of the annular feeding well 3; the torsion shaft 15 and the bearing hole 17 on the wall of the annular feeding well 3 are rotatably matched through the bearing; the root of the guide swing piece 9 is integrally fixed on the torsion shaft 15, and the root of the fixed guide piece 16 is fixed on the lower side of the upper end of the spiral structure of the lower spiral retention guide blade 1b; the guide swing The end of the sheet 9 extends obliquely upward, and the end of the fixed guide sheet 16 extends obliquely downward; the upper seesaw 8 is between the guide swing sheet 9 and the fixed guide sheet 16; under normal conditions, the lower surface of the guide swing sheet 9 rests on the oblique upper end of the upper seesaw 8, and a “>”-shaped water inlet 7 is formed between the lower surface of the upper section of the guide swing sheet 9 and the upper surface of the upper seesaw 8, and the opening direction of the “>”-shaped water inlet 7 is opposite to the liquid flow direction in the spiral material retention guide channel 5 at the location.

[0035] A downwardly slanting counter-flow channel 14 is formed between the fixed guide plate 16 and the upwardly tilted plate 8, and the downwardly slanting end of the counter-flow channel 14 corresponds to the terminal outlet 10 of the spiral guide channel; the jet flowing downwardly along the counter-flow channel 14 counter-flows the jet discharged from the terminal outlet 10 of the spiral guide channel.

[0036] One end of the torsion shaft 15 extends out of the outside of the annular feeding well 3, and a torsion plate 19 is fixedly connected to one end of the torsion shaft 15 outside the annular feeding well 3. A torsion spring 18 or a torsion applying device is provided on a section of the torsion shaft 15 outside the annular feeding well 3; the torsion spring 18 applies a counterclockwise torque to the torsion shaft 15, so that the lower surface of the guide swing plate 9 is tightly rested on the inclined upper end of the upper rocker plate 8.

[0037] When the guide swing piece 9 rotates upward clockwise by a certain angle along with the torque shaft 15, the guide swing piece 9 separates from the upper swing plate 8, the “>”-shaped water inlet 7 expands and is converted into the counter-flushing channel entrance 13; after the “>”-shaped water inlet 7 expands and is converted into the counter-flushing channel entrance 13, the inner end of the counter-flushing channel entrance 13 is connected to the upper oblique end of the counter-flushing channel 14; at the same time, a section of the spiral material retention guide channel 5 on the upper side of the guide swing piece 9 becomes relatively narrower; a limiting protrusion 30 is provided on the upper side of the torque shaft 15, and when the torque shaft 15 rotates clockwise by a certain angle, the limiting protrusion 30 limits the contact with the spiral upper end of the lower section of the spiral retention guide blade 1b.

[0038] Working principle of this scheme: The annular cylindrical feeding well 3 of this scheme is coaxially fixedly arranged on the upper part of the thickener's thickening tank, and at least the lower part of the annular cylindrical feeding well 3 is immersed in the thickener's thickening tank, and the flocculating agent can be continuously added to the liquid pool in the dilution column cavity 4 during the following working process;

[0039] During operation, the slurry conveying device continuously conveys the slurry material through the feed pipe 2 in the form of a jet along the tangential direction to the spiral upper end of the spiral material retention and diversion channel 5, and then the slurry material flows downward along the spiral path of the spiral material retention and diversion channel 5 under the drive of its own momentum and the guidance of the spiral retention and diversion blades 1. Since any position of the spiral material retention and diversion channel 5 is connected to the dilution column chamber 4, the slurry material continuously generates shear force and friction force on the path it flows through during the process of flowing downward along the spiral path of the spiral material retention and diversion channel 5, so that the material along the spiral path flow channel of the spiral material retention and diversion channel 5 continuously forms tumbling and momentum consumption at any position, so that the slurry material flows downward along the spiral path of the spiral material retention and diversion channel 5. The flow rate of the path gradually decreases, and the slurry material continues to mix and blend with the liquid and flocculant in the dilution column chamber 4 under the action of continuous tumbling and shearing during the process of moving along the spiral downward path of the spiral material retention and diversion channel 5; at the same time, the jet flow rate of the slurry material discharged from the final outlet 10 of the spiral diversion channel is significantly lower than the flow rate in the feed pipe 2, so that the spiral material retention and diversion channel 5 in the annular feeding well 3 not only serves the purpose of fully mixing and blending with the liquid and flocculant in the dilution column chamber 4, but also significantly dissipates the momentum of the slurry material, so that the jet intensity discharged from the final outlet 10 of the spiral diversion channel is significantly reduced, so as to avoid the slurry material directly impacting the settled material inside the thickener concentration tank at high speed, so as to prevent the destruction of the formed floccules and cause the overflow liquid to become turbid;

[0040] In the above process, there are two situations:

[0041] In the first case, when the flow rate in the feed pipe 2 is high:

[0042] If there is no adaptive fluid momentum offset unit 6 of the present scheme, although the spiral path of the spiral material retention guide channel 5 causes significant momentum consumption for the fluid flowing through, the initial flow rate given by the feed pipe 2 is too fast, resulting in the jet intensity discharged from the terminal outlet 10 of the spiral guide channel still being relatively high, and the jet discharged from the terminal outlet 10 of the spiral guide channel will still directly impact the settled material inside the thickener concentration tank at a relatively high speed, destroying the formed floccules and causing the overflow liquid above to become turbid; and in the present scheme, when the relatively high flow rate in the feed pipe 2 causes the flow rate in the spiral material retention guide channel 5 to be too fast, the “>”-shaped water inlet 7 is subjected to a strong head-on impact force of the slurry material, causing the liquid impact force on the lower surface of the upper section of the guide swing plate 9 to overcome the torsion spring 18, thereby causing the guide swing plate 9 to rotate upward clockwise around the axis of the torsion shaft 15 by a certain angle under the strong impact of the slurry fluid, such as Figure 8As shown, until the limiting protrusion 30 contacts the spiral upper end of the lower spiral retention guide blade 1b, at this time, the guide swing piece 9 is separated from the upper swing plate 8, the ">"-shaped water inlet 7 expands and is converted into the counter-flushing channel entrance 13; after the ">"-shaped water inlet 7 expands and is converted into the counter-flushing channel entrance 13, the inner end of the counter-flushing channel entrance 13 is connected to the oblique upper end of the counter-flushing channel 14; at the same time, a section of the spiral material retention guide channel 5 on the upper side of the guide swing piece 9 becomes relatively narrower, and at this time, the jet flowing obliquely downward along the counter-flushing channel 14 forms an offset with the jet discharged from the spiral guide channel terminal outlet 10, thereby further weakening the jet intensity discharged from the spiral guide channel terminal outlet 10, thereby preventing the slurry material discharged from the spiral guide channel terminal outlet 10 from directly impacting the settled material inside the thickener thickening tank at high speed, so as to prevent the formed floccules from being destroyed and causing the overflow liquid to become turbid;

[0043] In the second case, when the flow rate or flow in the feed pipe 2 is low or moderate:

[0044] Since the initial flow rate given by the feed pipe 2 is low or moderate, the momentum consumption caused by the spiral path of the spiral material retention guide channel 5 on the fluid flowing through is sufficient to weaken the jet intensity discharged from the outlet 10 at the end of the spiral guide channel to the point that it will not effectively impact and turbid the settled materials inside the thickener concentration tank; when the flow rate in the feed pipe 2 is low, the flow rate in the spiral material retention guide channel 5 is low, and the impact force of the slurry material on the ">"-shaped water inlet 7 is not enough to make the liquid impact force on the lower surface of the upper section of the guide swing plate 9 overcome the torsion spring 18, so the guide swing plate 9 will not do any action, such as Figure 6 and 7 As shown, the slurry material can smoothly move along the single guide channel 5, and the slurry material is continuously mixed and blended with the liquid and flocculant in the dilution column chamber 4 under the action of continuous tumbling and shearing during the entire process of moving along the spiral downward path of the spiral material retention guide channel 5. The "first situation" will not occur in which a part of the slurry liquid directly reaches the end outlet 10 of the spiral guide channel through the "shortcut" of the "hedge channel 14", thereby causing insufficient mixing and blending with the flocculant.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A spiral feeding device for a solid-liquid separation thickener, characterized in that: The invention comprises an annular feeding well (3), the inner side of which is a dilution column cavity (4) which is connected from top to bottom, a feeding pipe (2) is fixedly connected to one side of the upper end of the annular feeding well (3) along the tangential direction, and the outlet end of the feeding pipe (2) is connected to the inner side of the annular feeding well (3) along the tangential direction; the inner wall of the annular feeding well (3) is integrally provided with a spiral retention guide blade (1) which is spirally spiraled, and the spiral retention guide blade (1) divides the circumferential edge space of the dilution column cavity (4) into a spiral material retention guide channel (5); the outlet end of the material pipe (2) is connected to the spiral upper end of the spiral material retention guide channel (5), and the spiral lower end of the spiral material retention guide channel (5) is the terminal outlet (10) of the spiral guide channel.

2. The spiral feeding device of the solid-liquid separation thickener according to claim 1, characterized in that: The spiral retention guide blade (1) comprises an upper spiral retention guide blade (1a) and a lower spiral retention guide blade (1b); the spiral extension lines of the upper spiral retention guide blade (1a) and the lower spiral retention guide blade (1b) are both on the path of the same cylindrical spiral line; An adaptive fluid momentum offset unit (6) is provided between the spiral lower end of the upper spiral retention guide blade (1a) and the spiral upper end of the lower spiral retention guide blade (1b).

3. The spiral feeding device of the solid-liquid separation thickener according to claim 2, characterized in that: The material flowing spirally downward along the inner flow channel of the spiral material retention guide channel (5) has a low flow rate state and a high flow rate state. In the low flow rate state, the adaptive fluid momentum offset unit (6) does not act. In the high flow rate state, the adaptive fluid momentum offset unit (6) actively acts and offsets and reduces the momentum of the material discharged from the outlet (10) at the end of the spiral guide channel.

4. The spiral feeding device of the solid-liquid separation thickener according to claim 3, characterized in that: The spiral lower end of the upper spiral retention guide blade (1a) is integrally connected with an upwardly tilted plate (8) that is inclined upward.

5. The spiral feeding device of the solid-liquid separation thickener according to claim 4, characterized in that: When the adaptive fluid momentum counteracting unit (6) comprises a torsion shaft (15), a guide swing plate (9) and a fixed guide plate (16); The torsion shaft (15) is close to the upper end of the spiral structure of the lower spiral retention guide blade (1b), and the axis of the torsion shaft (15) extends along the radial direction of the annular feeding well (3); the torsion shaft (15) and the bearing hole (17) on the wall of the annular feeding well (3) are rotatably matched through the bearing; the root of the guide swing plate (9) is integrally fixed on the torsion shaft (15), and the root of the fixed guide plate (16) is fixed on the lower side of the upper end of the spiral structure of the lower spiral retention guide blade (1b); the guide swing plate The end of the guide plate (9) extends obliquely upward, and the end of the fixed guide plate (16) extends obliquely downward; the upper plate (8) is between the guide swing plate (9) and the fixed guide plate (16); in a normal state, the lower surface of the guide swing plate (9) rests on the oblique upper end of the upper plate (8), and a ">"-shaped water inlet (7) is formed between the lower surface of the upper section of the guide swing plate (9) and the upper surface of the upper plate (8), and the opening direction of the ">"-shaped water inlet (7) is opposite to the liquid flow direction in the spiral material retention guide channel (5) at the location; A counter-flow channel (14) obliquely facing downward is formed between the fixed guide plate (16) and the upward-swaying plate (8), and the oblique lower end of the counter-flow channel (14) corresponds to the terminal outlet (10) of the spiral guide channel; the jet flowing obliquely downward along the counter-flow channel (14) counter-flows the jet discharged from the terminal outlet (10) of the spiral guide channel.

6. The spiral feeding device of the solid-liquid separation thickener according to claim 5, characterized in that: One end of the torsion shaft (15) extends out of the outside of the annular feeding well (3); the end of the torsion shaft (15) outside the annular feeding well (3) is fixedly connected to a torsion plate (19); a torsion spring (18) or a torsion applying device is provided on a section of the torsion shaft (15) outside the annular feeding well (3); the torsion spring (18) applies a counterclockwise torque to the torsion shaft (15), so that the lower surface of the guide swing plate (9) is tightly placed on the upper inclined end of the upper rocker plate (8).

7. The spiral feeding device of the solid-liquid separation thickener according to claim 6, characterized in that: When the guide swing plate (9) rotates clockwise upwards by a certain angle along with the torque shaft (15), the guide swing plate (9) separates from the upper swing plate (8), the ">"-shaped water inlet (7) expands and is converted into the counter-flushing channel entrance (13); after the ">"-shaped water inlet (7) expands and is converted into the counter-flushing channel entrance (13), the inner end of the counter-flushing channel entrance (13) is connected to the oblique upper end of the counter-flushing channel (14); at the same time, a section of the spiral material retention guide channel (5) on the upper side of the guide swing plate (9) becomes relatively narrower.

8. The spiral feeding device of the solid-liquid separation thickener according to claim 7, characterized in that: A limiting protrusion (30) is provided on the upper side of the torsion shaft (15). When the torsion shaft (15) rotates clockwise by a certain angle, the limiting protrusion (30) contacts the spiral upper end of the lower spiral retention guide vane (1b).

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