A flat bottom immersion scraper extractor

Abstract

The present invention relates to a flat-bottom immersion type scraper extractor, wherein an annular chain is provided in the inner cavity of the box body, and scrapers are evenly installed on the annular chain, and the scrapers extend transversely along the box body, and the box body is provided with a horizontal bottom wall, and a driving shaft is provided at the upper part of the head end of the box body, and a driving sprocket is installed on the driving shaft; a head end driven shaft is provided at the lower part of the head end of the box body, and a head end driven sprocket is installed on the head end driven shaft; a tail end driven shaft is provided at the lower part of the tail end of the box body, and a tail end driven sprocket is installed on the tail end driven shaft; the annular chain is sequentially wrapped around the driving sprocket, the head end driven sprocket and the tail end driven sprocket to form a triangle including a vertical section, a horizontal section and an inclined section, and an extracting liquid is stored at the bottom of the box body to form an immersion pool, and the horizontal section is immersed in the immersion pool as a whole. The immersion time of the powder of the extractor is long, the immersion efficiency is high, and it can meet large-scale industrial production, and it is widely applicable to most oil-containing materials such as fish meal, rice bran, rapeseed cake, tea seed cake, oil sand ore, etc., and realizes universal extraction.

Description

Technical Field

[0001] The invention relates to an extraction device, in particular to a flat-bottom immersion scraper extractor, in particular to the extraction of powdered materials and high-powder solid materials, realizing the separation of solutes and solids, and belonging to the technical field of extraction equipment. Background Art

[0002] There are many types of extraction equipment on the market, including fixed bed type, moving bed type, basket type and cartridge type. The general principle is that the solids naturally accumulate into a stable bed or are forced to form a stable bed, and the extraction liquid or washing liquid is poured in from above the bed, and the liquid penetrates the material layer to complete the mass transfer process.

[0003] This type of equipment has requirements for the particle size of solid materials. Solid materials should be in bulk or flake form. There should be a certain gap between particles after stacking. Usually, the porosity needs to reach more than 10% to facilitate the penetration of extraction liquid or washing liquid. When the powder in the solid material is too large, the porosity of the material bed is insufficient. When the porosity is lower than 5%, the penetration rate will decrease or no penetration will occur, such as the leaching of fish meal, rice bran, rapeseed cake, tea seed cake, tea seed cake and palm kernel cake.

[0004] In addition, there are requirements for the physical and chemical properties of solids and liquids. Some solid components are miscible with liquid components to form viscous substances, which clog the filter or grid, resulting in reduced or unsustainable extraction or washing process effects, and require frequent cleaning and maintenance, such as soy concentrate protein extraction.

[0005] The white bean flakes or low-denaturation expanded materials used as the raw materials for processing soybean protein concentrate contain 8-10% high-powder debris, which cannot be processed through conventional leaching processes and must be screened out and treated as waste materials, resulting in low economic returns for the material, poor sales, and capital occupation.

[0006] There is a type IV extractor on the market now. Four inclined and parallel scrapers are installed in the same box. The upper scraper transports the material downward and soaks it in the extraction liquid. After reaching the bottom of the scraper, the lower scraper lifts the material upward. After rising to a certain height, it falls into the upper layer of the next scraper. In this way, the four scrapers repeatedly lift and fall, which prolongs the extraction time and path. However, the following problems still exist:

[0007] 1. The scrapers at all levels are arranged in sequence along the axis of the length of the box, similar to a long snake, which makes the equipment longer and has higher requirements on the length of the workshop;

[0008] 2. Most of the solid materials are in laminar contact with the extract, and are not fully mixed with the extract;

[0009] 3. The extract flows by gravity through the drop, the light phase is located at the top of the liquid layer, and the new solution is prone to short circuit;

[0010] 4. The above reasons lead to insufficient extraction power and low extraction efficiency;

[0011] 5. The extraction path seems to be long, but the material falling from the previous scraper directly falls into the area below the liquid surface of the upper scraper of the next level. Only a short path is used for immersion extraction, without draining and spraying extraction process. There is no material above the middle of the upper scraper, and the upper screen surface utilization rate of each group of leaching units is very low;

[0012] 6. The final extraction unit uses an upper scraper to transport materials upwards. Only the upper screen surface is the working surface, and the lower layer is empty and useless.

[0013] 7. Sprockets are set at the upper and lower ends of each scraper, with multiple shaft systems and complex drives, which can easily lead to mechanical failures.

[0014] Take the treatment of waste clay produced in the oil refining and decolorization process as an example. Activated clay is usually used to adsorb impurities and pigments in oils and fats because of its large specific surface area and good adsorption. Generally, 1.5-2kg of activated clay must be added for every ton of vegetable oil processed. After the decolorization process is completed, the decolorized oil mixed with clay is filtered through a filter press to obtain decolorized oil and oil-containing filter cake. Traditionally, steam is used to blow the filter cake, which can reduce the adsorbed oil in the filter cake to about 25%, and then discharge it as waste. Because the waste clay adsorbs a large amount of oil, it is prone to spontaneous combustion if it is not stored properly, and the oil inside it quickly becomes rancid at high temperatures. Countries that produce a lot of palm oil use a large amount of activated clay for decolorization. Due to the difficulty of treatment and low recovery value, it is usually treated by direct landfill, which causes alkaline substances and fatty acids in the waste clay to pollute groundwater. Relevant countries have enacted laws to prohibit landfill treatment. Finding a relatively economical method for treating waste clay is a top priority for local oil companies and plantations. Summary of the invention

[0015] The purpose of the present invention is to overcome the problems existing in the prior art and provide a flat-bottom immersion scraper extractor, which has a long immersion time for powder and high penetration efficiency, can ensure that the liquid can penetrate the powder material, can meet large-scale industrial production, and is widely applicable to most fish meal, rice bran, rapeseed cake, tea seed cake, oil sand ore and other oil or oil-containing materials, thereby realizing "universal" extraction.

[0016] To solve the above technical problems, the present invention provides a flat-bottom immersion scraper extractor, comprising a box body, an inner cavity of the box body is provided with an annular chain, scrapers are evenly installed on the annular chain, the scrapers extend laterally along the box body, the box body is provided with a horizontal bottom wall, the upper part of the head end of the box body is provided with a driving shaft, and a driving sprocket is installed on the driving shaft; the lower part of the head end of the box body is provided with a head end driven shaft, and a head end driven sprocket is installed on the head end driven shaft; the lower part of the tail end of the box body is provided with a tail end driven shaft, and a tail end driven sprocket is installed on the tail end driven shaft; the annular chain is sequentially wrapped around the driving sprocket, the head end driven sprocket and the tail end driven sprocket to form a triangle including a vertical section, a horizontal section and an inclined section, an extraction liquid is stored at the bottom of the box body to form an immersion pool, and the horizontal section is immersed in the immersion pool as a whole.

[0017] As an improvement of the present invention, the vertical section between the driving sprocket and the head-end driven sprocket is a feeding section, a feeding valve is installed on the top of the box above the feeding section, and a storage box is provided at the inlet of the feeding valve. The horizontal section between the head-end driven sprocket and the tail-end driven sprocket is a soaking section, and the inclined section between the tail-end driven sprocket and the driving sprocket includes a draining section and a blanking section in sequence, and the blanking section is close to the driving sprocket; a liquid-permeable grid is provided under the annular chain of the draining section, and a draining blanking trough is provided under the annular chain of the blanking section.

[0018] As a further improvement of the present invention, the box body is provided with a plurality of mutually parallel longitudinal partitions to divide the inner cavity of the box body into a plurality of leaching units, and the leaching units are arranged side by side in the transverse direction of the box body; each leaching unit is provided with the annular chain, and the scraper on each annular chain matches the width of the corresponding leaching unit; a conveying auger extending transversely along the box body is provided below the draining and blanking trough, and the two ends of the conveying auger extend outside the box body respectively, and one end of the conveying auger is provided with an auger feed port opening upward, and the other end is provided with a discharge port opening downward; the upper part of the cylinder body of the conveying auger located in the box body is open, and the discharge of the draining and blanking trough of each leaching unit falls into the auger trough of the conveying auger respectively, and the bottom of the conveying auger is provided with a plurality of auger blanking ports corresponding to each level of immersion pools one by one, and the blanking of each auger blanking port respectively enters the next level of immersion pools so that adjacent leaching units are connected in series in sequence.

[0019] As a further improvement of the present invention, a draining slide is provided at the lower end of each draining trough, the lower end of each draining slide is inclined toward the discharge port, and the projection of each draining slide on the bottom of the conveying auger covers the auger discharge port of this level.

[0020] As a further improvement of the present invention, an immersion chute inclined toward the discharge port is provided below each auger discharge port, and each immersion chute guides the material to the middle area of ​​the corresponding immersion tank.

[0021] As a further improvement of the present invention, each auger discharge port is located above the upper level immersion pool, the middle section of each immersion chute passes through the hole of the corresponding longitudinal partition or the side wall of the box, and the lower end of each immersion chute points to the middle area of ​​the immersion pool of this level.

[0022] As a further improvement of the present invention, each of the longitudinal partitions is provided with a partition overflow port, and the closer to the auger feed port, the lower the overflow height of the partition overflow port, and fresh extraction liquid is added to the soaking pool with the highest liquid level.

[0023] As a further improvement of the present invention, each of the baffle overflow ports is provided with a C-shaped guide groove for guiding the extraction liquid to the lower part of the soaking tank, and the opening of each C-shaped guide groove is welded to the longitudinal baffle.

[0024] As a further improvement of the present invention, the overflow ports on adjacent longitudinal partitions are alternately staggered in the length direction of the box body, so that the overflow paths of adjacent leaching units are S-shaped.

[0025] As a further improvement of the present invention, the outer edge of each scraper is respectively provided with a scraper folded edge bent in the forward direction, and the scraper is evenly and densely covered with fish scale holes.

[0026] As a further improvement of the present invention, the side wall of the box body is provided with a dissolution interface, each dissolution interface is respectively connected with a dissolution steam pipe, the dissolution steam pipe is located above the liquid surface of the immersion pool, and the top of the box body is provided with an exhaust port.

[0027] As a further improvement of the present invention, at least two boxes are arranged side by side, and the conveying auger penetrates each box along the width direction. The liquid level heights between adjacent boxes and adjacent leaching units in the box are reduced successively along the axis of the conveying auger. Fresh extraction liquid is added to the immersion pool with the highest liquid level in each box, and overflow connecting pipes are provided between the side walls of adjacent boxes for the extraction liquid to overflow into the next box.

[0028] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. It is suitable for leaching various high-powder materials, reducing powder waste, improving the utilization rate and economic value of oil-containing materials such as fish meal, rice bran, rapeseed cake and tea seed cake, and can also improve the utilization value of oil sands and tailings, eliminate environmental pollution, and can be used for "universal" extraction of most oil-containing powders;

[0029] 2. Make full use of the width of the box, set up multiple leaching units side by side, each leaching unit is equipped with an annular scraper, and the annular scrapers are arranged side by side. Adjacent leaching units are horizontally transported by conveying augers. Adjacent leaching units are arranged in parallel in space, forming a series process in the extraction process. Multi-stage extraction greatly saves space occupation and reduces the supporting feeding equipment;

[0030] 3. During the extraction process at each level, the powder is fed by both the scraper in translation and the auger in spiral. The powder can be stirred and turned over many times, so that the powder can be fully soaked by the extraction liquid when it falls into the soaking tank, avoiding the powder agglomeration and the inability of the powder agglomerate to contact the extraction liquid;

[0031] 4. The liquid level of the primary soaking tank is the lowest, and the concentration of the extract is the highest. The new powder with the highest oil content first enters the primary soaking tank for extraction by the concentrated solution; the powder with slightly higher oil content enters the intermediate soaking tank for extraction by the second fresh extract; the liquid level of the final soaking tank is the highest, and the concentration of the extract is the lowest. The powder with the lowest oil content to be discharged is extracted by the freshest dilute solution; the material and the extract flow in the opposite direction, always maintaining a large extraction power, which greatly improves the leaching efficiency of the powdered material; for equipment of the same volume, under the condition of the same extract feed amount, when processing materials of the same mass, the residual oil (or solute) content in the solid residue is low, and the solute recovery rate is high;

[0032] 5. The extraction process has been improved. Traditional extraction is a simple process of scooping out, soaking, scooping out again, and soaking again. The material moves along the length of the box and is only pushed by the scraper. The scraper has almost no stirring effect on the material. In addition, the material is soaked for a short time and cannot be fully infiltrated. The relative movement speed between the solid phase and the liquid phase is low, the solid-liquid contact surface is in a stagnant state, and the relative flow between the liquid and the liquid is insufficient. The light phase (dilute solution) floats on the liquid surface, and a short circuit will inevitably occur when overflowing;

[0033] The material of the present invention moves along the length direction of the box body and along the width direction of the box body; the drained material is transported horizontally to the next-level soaking tank by the conveying auger. During the horizontal transportation process, the material is fully turned over after two drops and multiple turns by the spiral blades, and the powder mass is loosely reconstructed to improve the extraction effect;

[0034] 6. The material advances in each soaking tank for a length equivalent to the effective length of the entire tank, and is fully soaked. After being fished out, the material is fully drained along the inclined section. The single leaching unit process is complete, the powder and the extract are fully infiltrated, the spray pump is omitted, and the operating energy consumption is reduced; after the powder is soaked, it is easy to form a solid-liquid mixture with strong fluidity, and the fluidized solid-liquid mixture is easy to block the spray pump and the spray pipe. After omitting the spray pump, the failure rate is greatly reduced;

[0035] 7. The mixed oil (extract) flows in both vertical and horizontal S-shaped flows between the leaching units, which can prevent the extract from short-circuiting;

[0036] 8. A single extractor is equipped with three-stage, four-stage or five-stage immersion tanks. Two extractors can be connected in series to complete six-stage, eight-stage or ten-stage immersion. They can also be flexibly matched according to process requirements or material characteristics to complete large-scale industrial extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0038] Figure 1 It is a front view of the flat-bottom immersion scraper extractor of the present invention;

[0039] Figure 2 for Figure 1 A top view of

[0040] Figure 3 for Figure 1 Right view of;

[0041] Figure 4 A longitudinal sectional view of a flat bottom immersion scraper extractor according to the present invention;

[0042] Figure 5 It is a transverse cross-sectional view of the flat-bottom immersion scraper extractor of the present invention;

[0043] Figure 6 A three-dimensional diagram of the endless chain and scraper of the present invention;

[0044] Figure 7 It is a right side view of the assembly of the present invention when installed;

[0045] Figure 8 It is a three-dimensional diagram of the combined installation of the present invention.

[0046] In the figure: 1. Box body; 1a. Longitudinal partition; 1a1. Partition overflow port; 1a2. C-shaped guide groove; 1a3. Partition inspection door; 1b. Exhaust port; 1c. Transverse partition; 1d. Dissolution interface; 2. Ring chain; 2a. Vertical section; 2b. Horizontal section; 2c. Inclined section; 3. Scraper; 3a. Scraper folding edge; 4. Driving shaft; 4a. Driving sprocket; 4b. Driving sprocket; 5 .Driven shaft at head end; 5a. Driven sprocket at head end; 6. Driven shaft at tail end; 6a. Driven sprocket at tail end; 7. Storage box; 8. Feeding valve; 9. Conveying auger; 9a. Auger inlet; 9b. Auger outlet; 9c. Immersion chute; 9d. Discharge port; 10. Drainage chute; 10a. Drainage slide; 11. Main reduction motor; 12. Auger reducer; 13. Overflow connecting pipe. DETAILED DESCRIPTION

[0047] In the following description of the present invention, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific direction.

[0048] like Figures 1 to 6 As shown, the flat-bottom immersion scraper extractor of the present invention comprises a box body 1, an inner cavity of the box body 1 is provided with an annular chain 2, scrapers 3 are evenly installed on the annular chain 2, the scrapers 3 extend laterally along the box body, the box body 1 is provided with a horizontal bottom wall, a driving shaft 4 is provided at the upper part of the head end of the box body 1, and a driving sprocket 4b is installed on the driving shaft 4; a head end driven shaft 5 is provided at the lower part of the head end of the box body 1, and a head end driven sprocket 5a is installed on the head end driven shaft 5; a tail end driven shaft 6 is provided at the lower part of the tail end of the box body 1, and a tail end driven sprocket 6a is installed on the tail end driven shaft 6; the annular chain 2 is sequentially wrapped around the driving sprocket 4b, the head end driven sprocket 5a and the tail end driven sprocket 6a to form a triangle including a vertical section 2a, a horizontal section 2b and an inclined section 2c, an extraction liquid is stored at the bottom of the box body 1 to form an immersion pool, and the horizontal section 2b is immersed in the immersion pool as a whole.

[0049] The shaft end of the driving shaft 4 is provided with a driving sprocket 4a, which is driven by the main reduction motor 11 through a chain. The outer periphery of the scraper 3 turning at the driven shaft 5 at the head end and the driven shaft 6 at the tail end is provided with an enveloping arc section, so that the scraper 3 can push the powder forward at the turning point.

[0050] The endless chain 2 is triangular in shape, and the wrap angles on the driving sprocket 4b, the head-end driven sprocket 5a and the tail-end driven sprocket 6a are relatively large, the number of meshing teeth is large, the contact stress of the sprocket is small, the wear of the chain roller and the sprocket tooth profile is light, and the single-axis drive can make the endless chain 2 run smoothly.

[0051] The length of the horizontal section 2b and the soaking section is equal to the effective length of the box 1, so that the powder has enough soaking time. The vertical section 2a, the horizontal section 2b and the inclined section 2c are all effective working sections for pushing materials, making the extractor work very efficient.

[0052] The vertical section 2a between the driving sprocket 4b and the head-end driven sprocket 5a is the feeding section, a feeding valve 8 is installed on the top of the box body 1 above the feeding section, and a storage box 7 is provided at the inlet of the feeding valve 8. The horizontal section 2b between the head-end driven sprocket 5a and the tail-end driven sprocket 6a is the soaking section, and the inclined section 2c between the tail-end driven sprocket 6a and the driving sprocket 4b includes a draining section and a blanking section in sequence, and the blanking section is close to the driving sprocket 4b; a liquid-permeable grid is provided under the annular chain of the draining section, and a draining blanking trough 10 is provided under the annular chain of the blanking section.

[0053] The powder in the storage box 7 is fed evenly by the feeding valve 8, the main reduction motor 11 drives the driving sprocket 4a to rotate through the chain, the driving sprocket 4a drives the ring chain 2 to rotate through the driving shaft 4 and the driving sprocket 4b, the scraper 3 on the ring chain 2 goes down along the vertical section 2a, and brings the material into the soaking pool, and part of the material falls directly into the soaking pool, and under the push of the scraper of the horizontal section 2b, it moves along the bottom wall of the soaking pool to fully soak and extract; after the driven sprocket 6a at the tail end turns, the powder at the bottom of the soaking pool is fished out, and climbs up along the inclined section 2c and gradually drains, the liquid phase leaks from the liquid permeable grid plate and falls back into the soaking pool. The drained material continues to go up and falls into the draining chute 10 to complete the current level of extraction.

[0054] A plurality of mutually parallel longitudinal partitions 1a are provided in the box body 1 to divide the inner cavity of the box body into a plurality of leaching units, and the leaching units are arranged side by side in the transverse direction of the box body; each leaching unit is provided with a ring chain, and the scraper on each ring chain matches the width of the corresponding leaching unit; a conveying auger 9 extending transversely along the box body is provided below the draining and blanking trough 10, and the two ends of the conveying auger 9 extend outside the box body respectively, and one end of the conveying auger 9 is provided with an auger feed port 9a opening upward, and the other end is provided with a discharge port 9d opening downward; the upper part of the cylinder of the conveying auger 9 located in the box body is open, and the discharge of the draining and blanking trough 10 of each leaching unit falls into the auger trough of the conveying auger 9 respectively, and a plurality of auger blanking ports 9b corresponding to each level of immersion pools are provided at the bottom of the conveying auger 9, and the blanking of each auger blanking port 9b enters the next level of immersion pools respectively to make adjacent leaching units connected in series in sequence.

[0055] The raw material enters the conveying auger 9 from the auger feed port 9a, and the auger reducer 12 drives the core shaft and the screw belt of the conveying auger 9 to rotate, pushing the raw material to move horizontally along the box body, and falls into the first-stage immersion tank from the first auger drop port for primary extraction. The raw material can also be discharged from the storage box 7 and directly fed into the first-stage immersion tank by the feeding valve 8. After being fished out from the first-level immersion tank, it falls back into the auger trough of the conveying auger 9 from the first-level draining trough, and continues to move to the next-level leaching unit under the push of the screw belt, and falls into the second-level immersion tank from the second auger feeding port for secondary extraction. After being fished out from the second-level immersion tank, it falls back into the auger trough of the conveying auger 9 from the second-level draining trough again, and continues to move forward under the push of the screw belt, and falls into the third-level immersion tank from the third auger feeding port for tertiary extraction. After being fished out from the third-level immersion tank, the material then falls back into the auger trough of the conveying auger 9 from the third-level draining trough, and is extracted step by step as follows until the material is discharged from the discharge port 9d of the conveying auger 9.

[0056] When transferring materials between adjacent leaching units, the materials first fall from the draining trough, then are pushed and turned by the spiral blades for multiple times, and then fall from the auger opening. During the lateral transfer of adjacent leaching units, the materials are fully turned over after two drops and multiple turns by the spiral blades, and the powder mass is loosely reconstructed. After falling into the soaking tank, the powder is fully in contact with the extraction liquid, and the extraction effect is good. Multi-stage extraction allows the extraction liquid on the periphery of the powder to be frequently updated, which is conducive to the extraction and improves the extraction efficiency.

[0057] A single extractor can be equipped with two, three, four or five-stage immersion tanks, which can be set according to process requirements.

[0058] A partition inspection door 1a3 is provided on the longitudinal partition 1a. A partition inspection door 1a3 can be provided inside and outside the chain space respectively. During maintenance, the partition inspection door 1a3 is removed to facilitate maintenance personnel to enter the adjacent leaching unit.

[0059] The lower end of each draining trough 10 is provided with a draining slide 10a, and the lower end of each draining slide 10a is inclined toward the discharge port 9d, so that the material of the draining trough 10 of this stage is directed to the direction of the next soaking pool, and is transported by the conveying auger 9 to the next leaching unit, and falls from the auger discharge port of the next stage into the soaking pool of the next stage, and is extracted step by step, and the material of the last draining trough 10 is discharged from the discharge port 9d. The projection of each draining slide 10a at the bottom of the conveying auger 9 covers the auger discharge port 9b of this stage, which can prevent the material entering the conveying auger 9 from the draining trough 10 of this stage from falling from the auger discharge port 9b of this stage.

[0060] Under each auger discharge port 9b, there is provided an inlet chute 9c inclined toward the discharge port 9d, and each inlet chute 9c guides the material to the middle area of ​​the corresponding soaking pool. Each auger discharge port 9b of the conveying auger 9 is biased toward the direction of the auger feed port 9a. The inlet chute 9c guiding the material to the middle area of ​​the soaking pool is provided by utilizing the clearance between the auger discharge port 9b and the liquid surface of the soaking pool. After the material falls from the auger discharge port 9b, it flows down along the inlet chute 9c and falls into the middle area of ​​the soaking pool. Under the disturbance of the liquid and the scraper 3, the material is spread on the inclined bottom wall in a semi-fluidized state.

[0061] Each longitudinal partition 1a is provided with a partition overflow port 1a1. The closer to the auger feed port 9a, the lower the overflow height of the partition overflow port 1a1, and the high liquid level overflows to the low liquid level step by step. The leaching unit close to the discharge port 9d is the final stage, and the leaching unit close to the auger feed port 9a is the primary stage. Fresh extract is injected into the final stage immersion tank to dilute the final stage extract. The closer to the primary stage, the concentration of the extract increases step by step.

[0062] Each baffle overflow port 1a1 is provided with a C-shaped guide groove 1a2, and the opening of each C-shaped guide groove 1a2 is welded on the longitudinal baffle 1a. The C-shaped guide groove 1a2 guides the extract to the lower part of the soaking tank to avoid short-circuit overflow from the top, so that the extract flows in an S shape in the height direction.

[0063] Each soaking tank is provided with one or two transverse partitions 1c, the upper edge of each transverse partition 1c is higher than the liquid surface, and the lower edge of each transverse partition 1c is located above the horizontal section 2b of the ring chain, further preventing the extraction liquid from short-circuiting and overflowing from the surface of the soaking tank, ensuring that the extraction liquid is in full contact with the material at the bottom of the soaking tank.

[0064] The partition overflow ports 1a1 on adjacent longitudinal partitions 1a can be alternately staggered in the length direction of the box body, and the distance between the partition overflow ports 1a1 of adjacent leaching units is increased, so that the overflow paths of adjacent leaching units flow in an S-shaped return flow, and the overflowing extract can be fully mixed with the extract in the immersion tank to avoid short circuit on the horizontal path.

[0065] like Figure 6 As shown, since the particle size of the powder is very small, after being soaked in the extracting liquid, it is easy to form a fluidized state of solid-liquid mixture, and it is not easy to be scooped out from the soaking pool by the scraper 3 and moved to the inclined section 2c for drainage. The present invention provides a scraper fold 3a curved in the forward direction on the outer edge of each scraper, which is conducive to holding the fluidized material. The scraper is evenly and densely covered with fish scale holes, which can cover the material and facilitate the extraction liquid to seep out and accelerate drainage.

[0066] In the usual practice, each auger discharge port 9b is located above the current soaking tank, and the material flows down the inlet chute 9c for a short distance to reach the middle area of ​​the soaking tank; however, this brings the following problems: since the distance between the drain discharge chute 10 and the conveying auger 9 is relatively short, a large angle must be set between the drain slide 10a and the vertical plane to cover the current auger discharge port 9b, making the slope of the drain slide 10a small. When the material flows up and down the relatively flat drain slide 10a, it is easy to be retained and not easy to be discovered. The retained material is easy to mold, etc., causing material pollution and affecting product quality.

[0067] like Figure 5 As shown, the present invention adopts the following measures to solve the problem that the draining slide 10a is too flat. By taking advantage of the relatively high clearance between the bottom of the conveying auger 9 and the bottom of the soaking tank, each auger feed opening 9b is offset towards the auger feed opening 9a by a distance, thereby extending the length of each soaking chute 9c. In this way, the coverage width of the draining slide 10a becomes narrower and can be set to be steeper, ensuring that no material is retained and the extraction quality is guaranteed.

[0068] Each auger feed opening 9b can be completely located above the upper soaking pool, and the auger feed opening 9b corresponding to the first soaking pool is located outside the side wall of the box body, close to the auger feed opening 9a, and the middle section of the first soaking chute passes through the hole in the side wall of the box body, and the lower end of the first soaking chute points to the middle area of ​​the first soaking pool;

[0069] The auger discharge port 9b corresponding to the second-stage immersion tank is located above the first-stage immersion tank, the middle section of the second-stage immersion chute passes through the hole of the first-stage longitudinal partition, and the lower end of the second-stage immersion chute points to the middle area of ​​the second-stage immersion tank;

[0070] The auger discharge port 9b corresponding to the third-stage immersion tank is located above the second-stage immersion tank, the middle section of the third-stage immersion chute passes through the hole of the second-stage longitudinal partition, and the lower end of the third-stage immersion chute points to the middle area of ​​the third-stage immersion tank. In this way, the drain slide 10a is steeper, and the angle between it and the vertical plane can be less than 20°, and the safety distance between the lower end of the drain slide 10a and the auger discharge port 9b is longer, which can be greater than 90mm.

[0071] like Figure 3 As shown, the side wall of the box is provided with a dissolution interface 1d, each dissolution interface 1d is respectively connected with a dissolution steam pipe, and the dissolution steam pipe is located above the liquid level of the soaking tank, and the top of the box is provided with an exhaust port 1b. When switching varieties or equipment maintenance, high-temperature steam is introduced through the dissolution steam pipe to evaporate the solvent and discharge it from the exhaust port 1b, and the moisture and residue at the bottom of the box can be discharged through the sewage outlet.

[0072] like Figure 7 and Figure 8 As shown, when a single extractor cannot meet the extraction requirements, two boxes can be set up side by side, and the conveying auger 9 passes through each box in the width direction. The auger feed port 9a is located at the primary stage of the first box, that is, the right side in the figure, and the discharge port 9d is located at the final stage of the second box, that is, the left side in the figure. An auger feed port for equipment can also be provided between the two boxes. The liquid level heights of adjacent boxes and adjacent leaching units in the box along the axis of the conveying auger 9 decrease successively, that is, the liquid level of the final stage immersion tank of the second box is the highest, the primary liquid level of the second box is higher than the liquid level of the final stage of the first box, and the primary liquid level of the first box is the lowest.

[0073] An overflow connecting pipe 13 is provided between the side walls of adjacent boxes for the extraction liquid to overflow into the next box. Taking each three-stage extraction as an example, fresh extraction liquid is added to the sixth-stage immersion tank with the highest liquid level in the second box, and overflows to the fifth-stage immersion tank and the fourth-stage immersion tank in turn, and then overflows to the third-stage immersion tank with the highest liquid level in the first box through the overflow connecting pipe 13, and then overflows to the second-stage immersion tank and the first-stage immersion tank in turn. The reverse flow of extraction liquid and material is achieved between each stage, maintaining the maximum extraction power and the highest extraction efficiency.

[0074] Three or more boxes can be set up side by side and flexibly configured according to process requirements or material characteristics to complete large-scale industrial extraction.

[0075] Taking the treatment of high-oil waste clay as an example, the residual oil of the waste clay after extraction treatment can be reduced to 1.0-1.5%wt. After desolventizing treatment by a steam degassing machine, the solvent can be recovered and used as a brick-making building material or recycled. The recovered vegetable oil can be used as industrial oil or biodiesel due to its high acid value. The extractor of the present invention can recover 200-240kg of oil and fat for every ton of waste clay processed, generating a profit of 1000-1500 yuan (RMB), completely realizing the transformation of waste into treasure, eliminating pollution sources, and realizing the sustainable development of the industry and green ecological construction.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the scope of patent protection of the present invention. In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention. The technical features not described in the present invention can be realized by or using existing technologies, and will not be repeated here.

Claims

1. A flat-bottom immersion scraper extractor, comprising a box, an inner cavity of the box is provided with an annular chain, scrapers are evenly installed on the annular chain, and the scrapers extend transversely along the box, characterized in that: The box body is provided with a horizontal bottom wall, a driving shaft is provided at the upper part of the head end of the box body, and a driving sprocket is installed on the driving shaft; a head end driven shaft is provided at the lower part of the head end of the box body, and a head end driven sprocket is installed on the head end driven shaft; a tail end driven shaft is provided at the lower part of the tail end of the box body, and a tail end driven sprocket is installed on the tail end driven shaft; the annular chain is sequentially wrapped around the driving sprocket, the head end driven sprocket and the tail end driven sprocket to form a triangle including a vertical section, a horizontal section and an inclined section, and an extraction liquid is stored at the bottom of the box body to form a soaking pool, and the horizontal section is immersed in the soaking pool as a whole; The vertical section between the driving sprocket and the head-end driven sprocket is the feeding section, the horizontal section between the head-end driven sprocket and the tail-end driven sprocket is the soaking section, and the inclined section between the tail-end driven sprocket and the driving sprocket includes a draining section and a blanking section in sequence, and the blanking section is close to the driving sprocket; a liquid-permeable grid is provided below the annular chain of the draining section, and a draining blanking trough is provided below the annular chain of the blanking section; The box body is provided with a plurality of mutually parallel longitudinal partitions to divide the inner cavity of the box body into a plurality of leaching units, and the leaching units are arranged side by side in the transverse direction of the box body; each leaching unit is provided with the annular chain, and the scraper on each annular chain matches the width of the corresponding leaching unit; a conveying auger extending transversely along the box body is provided below the draining and blanking trough, and the two ends of the conveying auger extend outside the box body respectively, and one end of the conveying auger is provided with an auger feed port opening upward, and the other end is provided with a discharge port opening downward; the upper part of the cylinder body of the conveying auger located in the box body is open, and the discharge of the draining and blanking trough of each leaching unit falls into the auger trough of the conveying auger respectively, and the bottom of the conveying auger is provided with a plurality of auger blanking ports corresponding to each level of immersion pools one by one, and the blanking of each auger blanking port respectively enters the next level of immersion pools so that adjacent leaching units are connected in series in sequence.

2. The flat bottom immersion scraper extractor according to claim 1, characterized in that: A feeding valve is installed on the top of the box body above the feeding section, and a material storage box is arranged at the inlet of the feeding valve.

3. The flat bottom immersion scraper extractor according to claim 1, characterized in that: The lower end of each draining and discharging trough is respectively provided with a draining slide, the lower end of each draining slide is respectively inclined toward the discharge port, and the projection of each draining slide on the bottom of the conveying auger covers the auger discharging port of this level.

4. The flat bottom immersion scraper extractor according to claim 3, characterized in that: An immersion chute inclined toward the discharge port is provided below each auger discharge port, and each immersion chute guides the material to the middle area of ​​the corresponding immersion tank.

5. The flat bottom immersion scraper extractor according to claim 4, characterized in that: The material discharge port of each auger is located above the upper soaking pool, the middle section of each soaking chute passes through the hole of the corresponding longitudinal partition or the side wall of the box, and the lower end of each soaking chute points to the middle area of ​​the soaking pool of this level.

6. The flat bottom immersion scraper extractor according to claim 1, characterized in that: Each of the longitudinal partitions is provided with a partition overflow port, and the closer to the auger feed port, the lower the overflow height of the partition overflow port, and the fresh extraction liquid is added to the soaking pool with the highest liquid level.

7. The flat bottom immersion scraper extractor according to claim 1, characterized in that: A C-shaped guide groove is provided at the overflow port of each partition plate to guide the extraction liquid to the lower part of the soaking tank, and the opening of each C-shaped guide groove is welded to the longitudinal partition plate.

8. The flat bottom immersion scraper extractor according to claim 1, characterized in that: The overflow ports on adjacent longitudinal partitions are alternately staggered in the length direction of the box body, so that the overflow paths of adjacent leaching units are S-shaped.

9. The flat bottom immersion scraper extractor according to claim 1, characterized in that: The outer edge of each scraper is respectively provided with a scraper folding edge bent in the forward direction, and the scraper is evenly and densely covered with fish scale holes.

10. The flat bottom immersion scraper extractor according to claim 1, characterized in that: The side wall of the box body is provided with a dissolution interface, each dissolution interface is respectively plugged with a dissolution steam pipe, the dissolution steam pipe is located above the liquid surface of the immersion tank, and the top of the box body is provided with an exhaust port.

11. The flat bottom immersion scraper extractor according to claim 1, characterized in that: At least two boxes are arranged side by side, and the conveying auger penetrates each box in the width direction. The liquid level heights between adjacent boxes and adjacent leaching units in the box are reduced successively along the axis of the conveying auger. Fresh extraction liquid is added to the immersion pool with the highest liquid level in each box. Overflow connecting pipes are provided between the side walls of adjacent boxes for the extraction liquid to overflow into the next box.

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