Unpowered tubular spiral filtration concentrator

Abstract

The utility model discloses an unpowered tubular spiral filtration thickener which comprises an upper cover plate, a lower bottom plate and a shell, the upper cover plate is arranged above the spiral filtration thickener, the lower bottom plate is arranged below the spiral filtration thickener, the upper cover plate and the lower bottom plate position and fix the shell, and the upper cover plate, the lower bottom plate and the shell form a closed space; the shell and the screen form a chamber c, and the upper cover plate, the lower bottom plate and the screen form a chamber a and a chamber b; a spiral shaft is arranged between the upper cover plate and the lower bottom plate, a hydraulic motor is arranged at the bottom of the spiral shaft, spiral blades are arranged on the spiral shaft, and a filter mud discharge port is formed in the bottom of the lower bottom plate; a filtrate overflow port is formed in the shell close to the upper cover plate; and a filtrate discharge port is formed in the shell close to the lower bottom plate. According to the utility model, the slurry is dewatered by utilizing the energy of the slurry, so that the solid content of the slurry is increased; meanwhile, the equipment is vertically arranged, the slurry is dehydrated by fully utilizing the pressure generated by the dead weight of the slurry, and the energy consumption is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of slurry dehydration, and particularly relates to a non-powered tubular spiral filter thickener. BACKGROUND

[0002] There are many kinds of existing dehydration equipment, mainly including horizontal centrifuges, vacuum filter presses, belt filter presses, plate-and-frame filter presses and spiral filter presses.

[0003] The spiral filter press device structure mainly comprises a spiral shaft, a screen mesh outside the spiral shaft, a plurality of water-permeable holes formed in the screen mesh, an outer shell arranged at the outermost side, an inlet and an outlet arranged at two ends, and a filtrate hole formed in the outer shell.

[0004] The above dehydration equipment has respective advantages and application occasions, but all needs to provide additional dehydration energy, such as hydraulic energy or electric energy, in the working process. UTILITY MODEL CONTENTS

[0005] Based on the technical problems existing in the prior art, the utility model provides a non-powered tubular spiral filter thickener, which solves the problem that no additional energy is consumed or less additional energy is consumed in the prior art, or utilizes the energy of slurry to realize dehydration, so as to improve the solid content of slurry.

[0006] The utility model provides a non-powered tubular spiral filter thickener, which comprises an upper cover plate, a lower bottom plate and an outer shell, the upper cover plate is arranged above the spiral filter thickener, the lower bottom plate is arranged below the spiral filter thickener, the upper cover plate and the lower bottom plate are positioned and fixed to the outer shell, and the upper cover plate, the lower bottom plate and the outer shell form a closed space; the outer shell and the screen mesh form a chamber c, and the upper cover plate, the lower bottom plate and the screen mesh form a chamber a and a chamber b; a spiral shaft is arranged between the upper cover plate and the lower bottom plate, a hydraulic motor is arranged at the bottom of the spiral shaft, spiral blades are arranged on the spiral shaft, and a filter mud discharge port is arranged at the bottom of the lower bottom plate; a filtrate overflow port is arranged on the outer shell and close to the upper cover plate, a filtrate discharge port is arranged on the outer shell and close to the lower bottom plate; a slurry inlet is arranged at the upper end of the upper cover plate, and an inlet valve is arranged at the upper end of the slurry inlet.

[0007] The screen is fixed on the screen fixing plate, and the single-side gap between the screen and the screw shaft is kept at any length ranging from 1.5 mm to 0.5 mm.

[0008] Preferably, a second discharger is arranged below the lower bottom plate.

[0009] More preferably, the second discharger comprises a second discharger shell, a sealing protrusion, a protrusion supporting plate, a second discharger connecting rod and a second discharger push rod.

[0010] A first discharger is arranged below the lower bottom plate. The first discharger comprises a first discharger shell, a rotating supporting plate, a rotating sealing plate, a first discharger push rod, a first discharger connecting shaft and a fixing plate.

[0011] Preferably, the first discharger shell is fixed on the lower bottom plate by bolts, and the rotating sealing plate is connected with the lower bottom plate to form a sealing fit surface.

[0012] Preferably, the first discharger connecting shaft is fixed on the rotating supporting plate, the first discharger push rod is connected with the fixing plate, and rotates around the stud of the fixing plate.

[0013] Compared with the prior art, the utility model has the beneficial technical effects as follows:

[0014] 1. The power source of the utility model is the pressure of the pipeline conveying slurry, and no additional squeezing pressure or compression pressure is needed, thereby saving most of the energy consumption.

[0015] 2. The utility model is vertically placed, and can also be dehydrated and concentrated by the gravity of the slurry at the upper end of the concentrator under the premise of no pipeline conveying pressure, thereby further reducing the energy consumption.

[0016] 3. The filter mud moisture content is adjusted by the opening size of the discharger discharging hole and the rotating speed of the screw shaft, so that the filter mud moisture content is controllable and adjustable.

[0017] 4. The compressed air and the slurry are mixed and pass through the water-permeable holes and the gaps together, so that the blockage of the gaps and the dehydration holes is reduced, the dehydration efficiency is improved, and the service life is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the principle diagram of the utility model;

[0019] Figure 2 is the front view of the first discharger of the utility model;

[0020] Figure 3 is the structure diagram of the first unloader of the unpowered tubular spiral filter concentrator according to the utility model;

[0021] Figure 4 is the structure diagram of the second unloader of the unpowered tubular spiral filter concentrator according to the utility model.

[0022] The reference signs in the drawings are explained as follows:

[0023] 1, slurry inlet; 2, filter mud discharge port; 3, filtrate discharge port; 4, filtrate overflow port; 5, upper cover plate; 6, lower bottom plate; 7, outer shell; 8, screen fixing plate; 9, screen; 10, spiral blade; 11, spiral shaft; 12, first unloader; 13, hydraulic motor; 14, feed valve, 12.1, first unloader shell; 12.2, rotating support plate; 12.3, rotating sealing plate; 12.4, first unloader push rod; 12.5, first unloader connecting shaft; 12.6, fixing plate, 15, second unloader; 15.1, second unloader shell; 15.2, sealing protrusion; 15.3, protrusion support plate; 15.4, second unloader connecting rod; 15.5, second unloader push rod. DETAILED DESCRIPTION

[0024] To make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the utility model.

[0025] In addition, it also needs to be explained that only the parts related to the utility model are shown in the drawings for convenience of description. In the case of no conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0026] It needs to be noted that the concepts of "first", "second" and the like mentioned in the utility model are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of the functions performed by these devices, modules or units.

[0027] It needs to be noted that the modification of "one", "multiple" mentioned in the utility model is illustrative rather than restrictive, and those skilled in the art should understand that unless explicitly indicated otherwise in the context, it should be understood as "one or more".

[0028] The utility model mainly applies scope is coal slurry dewatering, thereby realizes the quality concentration of coal powder in slurry. Also can be applied to sludge dewatering industry, carries out dewatering to water content sludge and improves solid content. Or other slurry needs dewatering and improves solid content industry.

[0029] The utility model discloses a kind of unpowered tubular spiral filter concentration machine, it includes upper cover plate, lower bottom plate and shell, upper cover plate is set in spiral filter concentration machine top, lower bottom plate is set in spiral filter concentration machine below, upper cover plate and lower bottom plate position and fixed shell, upper cover plate, lower bottom plate and shell constitute closed space;The shell and screen mesh constitute chamber c, upper cover plate, lower bottom plate and screen mesh constitute chamber a and chamber b;Spiral shaft is arranged between upper cover plate and lower bottom plate, hydraulic motor is arranged at the bottom of spiral shaft, spiral vane is arranged on spiral shaft, filter mud discharge port is arranged at the bottom of lower bottom plate;Filter liquor overflow port is arranged on shell near upper cover plate, filter liquor discharge port is arranged on shell near lower bottom plate.The utility model utilizes the energy of slurry itself to dewater, reach the purpose of improving slurry solid content;While arranging equipment vertically, slurry self-weight generated pressure is fully utilized to realize slurry dewatering, further reduce energy consumption.

[0030] The utility model discloses a kind of unpowered tubular spiral filter concentration machine. As shown in Figures 1-4 The utility model provides a kind of unpowered tubular spiral filter concentration machine, it includes chamber a, chamber b and chamber c, chamber a, chamber b and chamber c, the demarcation of the chamber a and chamber b is dynamic, according to the interface line of upper section slurry and lower section filter mud is divided;Chamber c is separated with chamber a and chamber b by screen mesh fixing plate 8 and screen mesh 9.The chamber a and chamber b are by feed valve 14, slurry inlet 1, spiral vane 10, spiral vane 11, screen mesh 9, the space of composition;The chamber c is by upper cover plate 5, lower bottom plate 6, screen mesh fixing plate 8 and shell 7, the space of composition.Chamber a is slurry chamber, chamber b is filter mud chamber, chamber c is filter liquor chamber.

[0031] The unpowered tubular spiral filter concentration machine is placed vertically, feed valve 14 is located above unpowered tubular spiral filter concentration machine, filter liquor inlet 1 and upper cover plate 5 and feed valve 14 are connected, feed valve 14 is fixed above slurry inlet 1, upper cover plate 5 is fixed on slurry inlet 1 outer side;The filter mud discharge port 2 is located below unpowered tubular spiral filter concentration machine, filter mud discharge port 2 is arranged at the opening of lower bottom plate 6, first unloader 12 is fixed on lower bottom plate 6, hydraulic motor 13 is arranged below filter mud discharge port 2, and hydraulic motor 13 is connected with spiral shaft 11, spiral vane 10 is arranged on spiral shaft 11;The shell 7 is arranged on the outer side of unpowered tubular spiral filter concentration machine, shell 7 is connected with filter liquor discharge port 3 and filter liquor overflow port 4 respectively, screen mesh 9 is fixed on screen mesh fixing plate 8.

[0032] Furthermore, in this preferred scheme, the slurry inlet is used to introduce slurry, the filter mud outlet 2 is used to discharge filter mud, the filtrate outlet 3 is used to discharge filtrate, and the filtrate overflow outlet 4 is used to automatically release filtrate after it reaches a high level. The filtrate overflow outlet 4 is connected to the atmosphere to ensure that chamber c is under normal pressure. The upper cover plate 5 is used to position and fix the outer shell 7, the screen fixing plate 8, and the screen 9, and also to position the spiral shaft 11, so that the single-sided gap between the screen 9 and the spiral shaft 11 is maintained within the range of 1.5mm-0.5mm. The lower bottom plate 6 is used to position and fix the outer shell 7, the screen fixing plate 8, the screen 9, and the unloader 12, and also to position the spiral shaft 11. The outer shell 7 is used to form chamber c, and the filtrate outlet 3 and the filtrate overflow outlet 4 are opened on the outer shell 7 to allow for controlled discharge of filtrate. The screen fixing plate 8 is used to provide support for the screen, and the screen 9 is fixed to the screen fixing plate 8. Screen 9 is used to trap coal powder with a particle size of 0.2mm-0.7mm and allow water in the slurry to pass through into chamber c. Spiral blades 10 are fixed to the spiral shaft 11 and are used to push the filter mud downwards; the spiral blades 10 rotate to push the filter mud downwards. The spiral shaft 11 provides support for the spiral blades, and its rotation drives the spiral blades 10 to rotate. A hydraulic motor 13 is connected to the spiral shaft 11; the hydraulic motor 13 can rotate and drive the spiral shaft 11 to rotate. A feed valve 14 is fixed to the slurry inlet 1. The feed valve 14 can be closed and opened or its opening degree can be adjusted to control the flow rate of coal slurry entering the coal slurry inlet 1.

[0033] The specific settings and functions of the first unloader 12 and the second unloader 15 are described below.

[0034] like Figure 2 , Figure 3 As shown, the first unloader 12 includes a first unloader housing 12.1, a rotating support plate 12.2, a rotating sealing plate 12.3, a first unloader push rod 12.4, a first unloader connecting shaft 12.5, and a fixing plate 12.6.

[0035] The first unloader housing 12.1 is fixed to the lower base plate 6 by bolts. The rotating sealing plate 12.3 is connected to the lower base plate 6 to form a sealing mating surface. The rotating support plate 12.2 is connected to the rotating sealing plate 12.3 by screws to form a rotating seal 12.7. The first unloader connecting shaft 12.5 is fixed to the rotating support plate 12.2. The first unloader push rod 12.4 is connected to the fixed plate 12.6 and rotates around the stud of the fixed plate 12.6.

[0036] Furthermore, in this preferred embodiment, the first unloader housing 12.1 is fixed on the lower base plate 6 and serves as the housing of the unloader, providing space and a rotation axis for the rotating sealing plate 12.3 and the rotating support plate 12.2 to rotate. The rotating support plate 12.2 and the rotating sealing plate 12.3 are connected to form a rotating body, which is placed inside the outer casing 12.1 to support and drive the rotating sealing plate 12.3 to rotate. The rotating sealing plate 12.3 forms a sealing mating surface with the lower bottom plate 6. After rotating a certain angle of 45°, the filter mud discharge port is closed, and after rotating 45° in the opposite direction, the filter mud discharge port is opened. The first unloader push rod 12.4 is connected to the fixed plate 12.6 and can rotate around the stud of the fixed plate 12.6. It is also connected to the first unloader connecting shaft 12.5 and can rotate around the first unloader connecting shaft 12.5 to push the rotating support plate to rotate within a 45° angle range. The first unloader connecting shaft 12.5 is fixed on the rotating support plate 12.2. The first unloader connecting shaft 12.5 is used to connect the first unloader push rod 12.4 and the rotating support plate 12.2, converting the linear stroke of the first unloader push rod 12.4 into the rotational stroke of the rotating support plate 12.2. The fixing plate 12.6 serves to fix one end of the first unloader push rod 12.4. It is used to fix the first unloader push rod 12.4 in one position.

[0037] like Figure 4 As shown, the second unloader 15 includes a second unloader housing 15.1, a sealing protrusion 15.2, a protrusion support plate 15.3, a second unloader connecting rod 15.4, and a second unloader push rod 15.5.

[0038] The second unloader housing 15.1 is fixed to the lower base plate 6 by bolts. The second unloader housing 15.1 is provided with a sealing protrusion 15.2 and a protrusion support plate 15.3. The protrusion support plate 15.3 supports the sealing protrusion 15.2. The protrusion support plate 15.3 is connected to the second unloader connecting rod 15.4. The second unloader push rod 15.5 is connected to the protrusion support plate 15.3 through the connecting rod 15.4.

[0039] Furthermore, in this preferred embodiment, the second unloader housing 15.1 is fixed to the lower base plate 6 and provides guidance for the up-and-down movement of the raised support plate; the sealing protrusion 15.2 can move up and down; when moving upward, the sealing protrusion inserts into the filter mud outlet 2, closing the filter mud outlet 2; when moving downward, the sealing protrusion and the filter mud outlet are separated, thereby opening the filter mud outlet; the raised support plate 15.3 is used to support the sealing protrusion 15.2, and the raised support plate 15.3 can move up and down under the action of the second unloader push rod 15.5, but cannot rotate; the second unloader connecting rod 15.4 is used to connect the second unloader push rod 15.5 and the raised support plate 15.3. The extension and retraction of the second unloader push rod 15.5 drives the raised support plate to move up and down through the second unloader connecting rod 15.4.

[0040] In a specific embodiment, the feed valve 14 of the unpowered tubular spiral filter thickener is opened, and the outlet of the first discharger 12 at the lower end is closed. The slurry transported by the pipeline enters the slurry inlet 1 of the thickener through the feed valve 14, and then enters the chambers a and b. Since the outlet of the discharger is closed, the slurry cannot be discharged and accumulates in the chambers a and b until they are completely filled. The water in the slurry passes through the filter gap of the screen 9 into the chamber c and forms filtrate. The filtrate is discharged through the filtrate discharge port 3, and if the level of the filtrate increases, it is discharged through the filtrate overflow port 4. Due to the filter gap of the screen 9, only water can pass through, and the coal powder in the slurry cannot pass through, so the coal powder remains in the chambers a and b. The coal powder retained by the screen moves downward under the action of gravity and the thrust of the spiral blade 10 until it reaches the lower bottom plate 6 and accumulates in the chamber b to form a filter mud layer. As the slurry continues to flow in and the filtrate continues to flow out, the filter mud layer gradually increases, and when it reaches a certain height, the filter mud discharge port 2 of the discharger is opened, and the filter mud is discharged from the filter mud discharge port 2. As the slurry continues to enter the thickener, the filtrate and filter mud continue to be discharged, thereby reducing the water content of the discharged filter mud, i.e., increasing the solid content of the coal slurry, and forming coal slurry with low water content.

[0041] In an embodiment, the pressure of the slurry transported by the pipeline is 10.0-13.0 MPa. The pressure of 10.0-13.0 MPa is reduced by the feed valve to reach a suitable working pressure of 2.0-13.0 MPa for the unpowered tubular spiral filter thickener. The working pressure of 2.0-13.0 MPa continuously acts on the slurry in the thickener, thereby providing power for the water in the slurry to pass through the gap of the screen 9 into the chamber c. Since the unpowered tubular spiral filter thickener is placed vertically, the slurry in the upper section also exerts pressure on the slurry in the lower end, which also provides power for the filtrate to pass through. The above two powers promote the continuous discharge of the filtrate. The filter mud retained is pushed downward by the rotation of the spiral and discharged through the filter mud discharge port. The pressure of the slurry and the gravity of the slurry in the upper section also push the filter mud downward and out. The combined force of the pressure of the slurry and the gravity of the slurry in the upper section promotes the continuous concentration and filtration of the slurry.

[0042] The chamber b is filled with filter mud, which needs to be at a certain height, preferably any height between 200mm and 800mm in this embodiment, more preferably 400mm, to seal the chamber b and prevent the slurry from being directly discharged from the filter mud discharge port 2. The height of the filter mud is a dynamic height, so the chamber b is also a dynamic chamber. During the operation of the thickener, the height of the filter mud in the chamber b is determined according to the water content of the discharged filter mud. If the water content of the filter mud is high, the oil supply of the hydraulic motor 13 is reduced to reduce the rotation speed of the screw shaft 11, increase the height of the filter mud in the chamber b, and establish a better filter mud seal, thereby reducing the water content of the discharged filter mud. If the water content of the filter mud is low, the oil supply of the hydraulic motor 13 is increased to increase the rotation speed of the screw shaft 11, reduce the height of the filter mud in the chamber b, and reduce the filter mud seal, thereby increasing the water content of the discharged filter mud.

[0043] In another specific embodiment, the lower bottom plate 6 is provided with filter mud passage holes at the bottom. The filter mud passage holes can be circular or shuttle-shaped. If the filter mud passage holes are circular, preferably, the diameter of the filter mud passage holes is any diameter between 50mm and 100mm, more preferably 80mm, and the filter mud passage holes can be 2, 4, 6, 8, etc., arranged uniformly on the reference circle. In this embodiment, the filter mud passage holes are shuttle-shaped, and two passages are arranged.

[0044] As Figure 2As shown in Figs. 1 and 3, the first discharger 12 rotates around the axis to adjust the opening size of the discharge hole. The first discharger 12 is a combination, the first discharger shell 12.1 has an inner flange hole and an outer flange hole, and the first discharger shell 12.1 is connected to the lower bottom plate 6 by bolts. The rotating support plate 12.2 and the rotating sealing plate 12.3 are connected by screws to form a rotating sealing member 12.7, and the rotating support plate 12.2 and the rotating sealing plate 12.3 rotate together. The rotating sealing member 12.7 rotates around the first discharger shell 12.1. The rotating sealing plate 12.3 and the lower bottom plate 6 are in clearance fit, and the clearance is 0.10mm-0.25mm. The rotating support plate 12.2 and the bottom plate of the first discharger shell 12.1 are in sliding friction. Since the first discharger 12 is provided with two discharge holes, the rotation angle of the rotating sealing member 12.7 is determined by the circumferential length of the discharge hole, and in this embodiment, the rotation angle of the rotating sealing member 12.7 is 45°. When the axis of the discharge hole of the rotating discharge member coincides with the axis of the discharge hole of the lower bottom plate 6, and the first discharger push rod 12.4 is in the retracted state, the fixed plate 12.6 is determined to be in position and fixed on the thickener support. The motor of the first discharger push rod 12.4 is started to extend the first discharger push rod 12.4, that is, to rotate counterclockwise by 45°, and the discharge hole is closed. When the first discharger push rod 12.4 is retracted, the discharge hole is opened. The first discharger push rod 12.4 is provided with a position sensor, and the opening size of the discharge hole can be adjusted to adjust the discharge amount of the filter mud. This action can also adjust the height of the filter mud layer in the chamber b, and further adjust the sealing performance.

[0045] In another specific embodiment, the sealing protrusion 15.2 in the second discharger 15 moves up and down around the axis of the second discharger 15. The protrusion is larger than the discharge hole of the lower bottom plate 6, and in this embodiment, the discharge hole of the lower bottom plate 6 is preferably a circular hole, and the number of discharge holes is 5-10, more preferably 8. The second discharger push rod 15.5 is arranged up and down, and is fixed at the lower end. When the second discharger push rod 15.5 moves upward, the sealing protrusion 15.2 blocks the discharge hole to close the discharge hole. When the second discharger push rod 15.5 moves downward, the sealing protrusion 15.2 moves away from the discharge hole by a certain distance, and the discharge hole is opened. Thus, the opening and closing of the discharge hole are realized. After the second discharger push rod 15.5 moves upward to close the discharge hole, a certain pressing force is maintained to make the sealing protrusion 15.2 tightly fit on the lower bottom plate 6. This pressing force can be set, and is preliminarily determined as z1. With the rotation of the screw shaft 11 to push the filter mud downward, when the pushing force is greater than z1, the second discharger push rod 15.5 will automatically move downward and open the discharge hole to discharge the filter mud. The setting of this pressing force z1 can be related to the moisture content of the discharged filter mud. If the moisture content of the filter mud is high, the value of z1 is adjusted to be large, and vice versa.

[0046] In one embodiment, another form of the helical blade 10 is to make the helical blade 10 hollow and to make water permeable slits on the helical blade 10. Another form of the helical shaft 11 is to make the helical shaft 11 hollow and to make water permeable slits on the helical shaft 11. The water permeable slits of the helical shaft 11 and the helical blade 10 are as large as the screen slits. The filtrate can also pass through the water permeable holes into the hollow chamber of the helical shaft 11 and then be introduced from the hollow chamber into, for example, a filtrate pipe, thereby achieving filtration.

[0047] In order to improve the filtration efficiency and reduce the plugging situation, compressed air is introduced at the filtrate inlet to mix with the slurry and pass through the dehydration holes and the screen slits 9 together.

[0048] In one specific embodiment, the slurry conveying pipeline is connected to the feed valve 14. The conveyed slurry pressure is any pressure between 10.0 MPa and 13.0 MPa, and the mass concentration is any mass concentration between 50% and 53%. In this embodiment, the conveyed slurry pressure is 12 MPa, and the mass concentration is 52%. The pressure of the slurry is reduced to 2.0 MPa-6.0 MPa by adjusting the opening of the feed valve 14. The reduced pressure slurry enters chambers a and b of the thickener from the slurry inlet 1. At this time, the discharge port of the discharger 12 is closed. The water in the slurry passes through the gaps in the screen 9 or the gaps between the spiral shaft 11 and the spiral blades 10 into chamber c, forming filtrate. The filtrate is discharged through the filtrate outlet 3 or the filtrate overflow port 4 of the outer casing 7. The slit size of screen 9 is 0.25mm-0.5mm. The particle size of the slurry coal is greater than 0.5mm. The granular coal powder in the slurry cannot pass through the slits of screen 9 and is thus trapped in chambers a and b. The trapped granular coal rotates together with the spiral blades 10 driven by the spiral shaft 11 at a speed of 1r / min-20r / min, preferably 5r / min-15r / min, and more preferably 10r / min. At the same time, under the gravity of the granular coal, it moves downward and forms a filter mud layer of granular coal with a height of about 400mm, thus forming chamber b. This filter mud layer is the sealing layer of the slurry, preventing the slurry water seal from passing through the sealing layer and being discharged from the first unloader 12. After the filter mud layer is established, the motor of push rod 12.4 is turned on, causing push rod 12.4 to slowly extend, thereby opening the discharge hole. The filter mud is then discharged through the discharge hole under the thrust of the spiral blades, the pressure of the slurry, and the gravity of the slurry. The discharged filter mud is the dewatered and concentrated product. The mass concentration of the filter mud is 65%-70%. When the filter mud concentration is low, the first discharger push rod 12.4 continues to extend to reduce the opening of the discharge hole of the first discharger 12, thereby reducing the amount of discharged filter mud. The filter mud layer is raised, and the resulting sealing layer is also raised, achieving better sealing and thus increasing the mass concentration of the discharged filter mud. When the filter mud concentration is high, the first discharger push rod 12.4 retracts to increase the opening of the discharge hole of the first discharger 12, thereby increasing the amount of discharged filter mud and reducing the thickness of the filter mud layer, i.e., the sealing layer, thus reducing the mass concentration of the discharged filter mud. When the opening of the discharge hole of the first unloader 12 is constant, if the mass concentration of the discharged filter mud is high, the oil supply of the hydraulic motor 13 can be reduced, thereby reducing the rotation speed of the screw shaft 11 and the screw blade 10, thus reducing the discharge of filter mud and increasing the mass concentration of the discharged filter mud; if the mass concentration of the discharged filter mud is low, the oil supply of the hydraulic motor 13 can be increased, thereby increasing the rotation speed of the screw shaft 11 and the screw blade 10, thus increasing the discharge of filter mud and decreasing the mass concentration of the discharged filter mud.

[0049] In another embodiment, during the operation of the previous embodiment, compressed air is introduced into the slurry inlet, and the compressed air and the slurry are mixed. The compressed air stirs the coal particles in the slurry, and the particles and the water in the slurry pass through the gaps of the screen 9, enter the chamber c, and then are discharged in the chamber c. In addition, the particles also enter the hollow chamber of the screw shaft 11 through the gaps of the screw blade 10, and then are discharged. Due to the introduction of the compressed air, the particles adhered to all the filter gaps are removed, and the particles are prevented from blocking the gaps. The dewatering efficiency is improved, and the service life is prolonged.

[0050] In an embodiment, the first unloader 12 is replaced by a deformed second unloader 15. The pushing force of the second unloader push rod 15.5 is initially set as z1, that is, the pressing force of the sealing protrusion 15.2 pressing the lower bottom plate 6. The blanking hole of the lower bottom plate 6 is kept closed. Due to the rotation of the screw shaft 11 and the screw blade 10, the filter mud is pushed downward, and when the pushing force is greater than the value z1, the second unloader push rod 15.5 moves downward, the blanking hole is opened, and the filter mud is discharged. The opening size of the blanking hole is automatically adjusted according to the rotation speed of the screw shaft 11. When the rotation is fast, the pushed filter mud is more, and the opening of the blanking hole is large; when the rotation is slow, the pushed filter mud is less, and the opening of the blanking hole is small.

[0051] In summary, the main application of the utility model is to introduce the pipeline transported coal slurry into the unpowered pipe type screw filter thickener, use the transportation pressure of the slurry to provide power for the dewatering of the slurry in the thickener, and make the slurry dewatering reach the purpose of improving the solid content of the slurry.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A gravity-free tubular spiral filter concentrator characterized in that, It includes the upper cover plate (5), the lower bottom plate (6) and the shell (7), the upper cover plate (5) is arranged above the spiral filter concentrator, the lower bottom plate (6) is arranged below the spiral filter concentrator, the upper cover plate (5) and the lower bottom plate (6) position and fix the shell (7), the upper cover plate (5), the lower bottom plate (6) and the shell (7) constitute a closed space; The shell (7) and the screen (9) constitute a chamber c, the upper cover plate (5), the lower bottom plate (6) and the screen (9) constitute a chamber a and a chamber b; The spiral shaft (11) is arranged between the upper cover plate (5) and the lower bottom plate (6), the bottom of the spiral shaft (11) is provided with a hydraulic motor (13), the spiral shaft (11) is provided with a spiral blade (10), and the bottom of the lower bottom plate (6) is provided with a filter mud discharge port (2); The filter liquid overflow port (4) is arranged on the shell (7) close to the upper cover plate (5), and the filter liquid discharge port (3) is arranged on the shell (7) close to the lower bottom plate (6); the upper end of the upper cover plate (5) is provided with a slurry inlet (1), and the upper end of the slurry inlet (1) is provided with a feeding valve (14).

2. The self-contained tubular screw filter thickener of claim 1 wherein, The screen (9) is fixed on the screen fixing plate (8).

3. The self-contained tubular screw filter thickener of claim 1 wherein, The single-edge gap between the screen (9) and the spiral shaft (11) is kept at any length between 1.5mm-0.5mm.

4. The self-contained tubular screw filter thickener of claim 2 wherein, The screen (9) retains coal powder with any particle size between 0.2mm-0.7mm.

5. The self-contained tubular screw filter thickener of claim 1 wherein, The second unloader (15) is arranged below the lower bottom plate (6).

6. The self-contained tubular screw filter thickener of claim 5 wherein, The second unloader (15) includes a second unloader shell (15.1), a sealing protrusion (15.2), a protrusion support plate (15.3), a second unloader connecting rod (15.4) and a second unloader push rod (15.5).

7. The self-contained tubular screw filter thickener of claim 1 wherein, The first unloader (12) is arranged below the lower bottom plate (6).

8. The self-contained tubular spiral filter concentrator of claim 7 wherein, The first unloader (12) includes a first unloader shell (12.1), a rotating support plate (12.2), a rotating sealing plate (12.3), a first unloader push rod (12.4), a first unloader connecting shaft (12.5) and a fixed plate (12.6).

9. The self-contained tubular spiral filter concentrator of claim 8 wherein, The first unloader shell (12.1) is fixed on the lower bottom plate (6) by bolts, and the rotating sealing plate (12.3) is connected with the lower bottom plate (6) to form a sealing surface.

10. The self-contained tubular spiral filter concentrator of claim 8 wherein, The first unloader connecting shaft (12.5) is fixed on the rotating support plate (12.2), the first unloader push rod (12.4) is connected with the fixed plate (12.6), and rotates around the stud of the fixed plate (12.6).

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