Step tunnel extractor

Abstract

The present invention discloses a step-tunnel type extractor, comprising a sealed box, the rear end of which is a feed end, the front end of which is provided with a discharge port, and the inner cavity of the box is provided with multiple soaking units from front to back in sequence, each soaking unit comprises a soaking tank, a lower shaft and an upper shaft, each lower shaft is respectively located at the bottom of the soaking tank of the same level, each upper shaft is respectively located above the soaking tank of the previous level, and a conveying chain is wrapped between the lower shaft and the upper shaft. The first-level soaking tank is close to the discharge port, and each soaking tank comprises a wall panel, an arc bottom and an inclined bottom plate which are connected in sequence, the lower shaft of this level is immersed in the arc bottom of the soaking tank of this level, the upper end of the inclined bottom plate extends to the rear side of the upper shaft of this level, and the upper end of the wall panel is connected to the lower inclined bottom plate of the soaking tank of the next level. The conveying chain is S-shaped and passes around the lower shaft and the upper shaft of each level in sequence. In the step-tunnel type extractor, the solid material and the extracting liquid can realize full countercurrent long-flow contact, strengthen the mass transfer process, and the solvent will not be short-circuited, and the extraction efficiency is high.

Description

Technical Field

[0001] The invention relates to an extractor, in particular to a step-tunnel type extractor, and belongs to the technical field of extraction equipment. Background Art

[0002] Extraction equipment is often used to extract oil or other effective ingredients. There are many types of extraction equipment on the market, including fixed bed type, moving bed type, basket type and filter cartridge type. The general principle is that solids naturally accumulate into a stable material bed or force a stable material bed, and the extraction liquid or washing liquid is poured from above the material bed. The liquid penetrates the material layer to complete the mass transfer process.

[0003] The Chinese invention patent with publication number CN 104474735B discloses "a continuous extraction device and process". It includes a closed extraction tank, in which N groups of chain scraper devices are obliquely installed. Each group of chain scraper devices includes an upper shaft and a lower shaft. The upper shaft and the lower shaft of the same group and the same end are connected by a single-loop chain transmission. Scrapers are evenly fixed on the chain. Each group of chain scraper devices is independent of each other and rotates in a closed loop. The extraction material inlet and the solvent inlet are installed at different positions on the upper part of the extraction tank, and the extraction liquid outlet and the extraction material outlet are installed at both ends of the extraction tank.

[0004] The extraction device has the following problems: 1. Most of the solid materials are in laminar contact with the extraction liquid, resulting in insufficient mixing of the solid materials and the extraction liquid;

[0005] 2. 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;

[0006] 3. There is no obvious drainage process for the solid material. The material pushed up by the scraper is mixed with a lot of concentrated extract, which leads to an increase in the solvent concentration on the low-concentration side, a decrease in the extraction power, and a decrease in the extraction efficiency;

[0007] 4. The extraction path seems to be long, but the utilization rate of the upper screen surface of each set of leaching units is very low;

[0008] 5. It needs to be driven by multiple reducers, usually at least a feed reducer, a main drive reducer and a discharge reducer. The main drive reducer provides power for several groups of chain scraper devices in the middle;

[0009] 6. The output speeds of the three reducers are different. In order to prevent blockage caused by excessive feeding or too slow discharging, in general, the speed of the reducer at the discharging end is faster, and the speed of the reducer at the feeding end is slower. The speed of the main drive reducer is between the feeding and discharging, and speed control needs to be performed separately;

[0010] 7. Each extraction unit is equipped with a set of single-loop chains, that is, each loop of the chain carries a set of drive shafts and guide shafts that rotate separately. There are many dynamic seals and the bearing seats are all external, which increases the difficulty of sealing and the risk of leakage. The extraction solvents are generally hexane, methanol (or ethanol), ether, acetone and other flammable, explosive and even toxic organic substances. Leakage will lead to the risk of explosion and increase the operating cost. Summary of the invention

[0011] The purpose of the present invention is to overcome the problems existing in the prior art and provide a stepped tunnel type extractor, in which the solid material and the extracting liquid can achieve full countercurrent long-flow contact, strengthen the mass transfer process, and the solvent will not short-circuit, and the extraction efficiency is high.

[0012] In order to solve the above technical problems, the present invention provides a stepped tunnel extractor, comprising a sealed box body, the rear end of the box body being a feed end, the front end being provided with a discharge port, the inner cavity of the box body being provided with a plurality of immersion units in sequence from front to back, each immersion unit comprising a immersion tank, a lower shaft and an upper shaft, each lower shaft being located at the bottom of the immersion tank of the same level, each upper shaft being located above the immersion tank of the previous level, and a conveying chain being wrapped around the lower shaft and the upper shaft.

[0013] As an improvement of the present invention, the first-stage immersion tank is close to the discharge port, and each stage of the immersion tank includes a wall panel, an arc-shaped bottom and an inclined bottom plate which are connected in sequence. The lower axis of this stage is immersed in the arc-shaped bottom of the immersion tank of this stage, and the upper end of the inclined bottom plate extends to the rear side of the upper axis of this stage. The upper end of the wall panel is connected to the bottom of the inclined bottom plate of the next stage of the immersion tank.

[0014] As a further improvement of the present invention, filter gratings are respectively provided on the upper part of each level of inclined bottom plate except the first level, and the height of the lower edge of the filter gratings decreases step by step from front to back and is higher than the top of the wall plate.

[0015] As a further improvement of the present invention, each level of the soaking unit is also provided with a baffle, each baffle is a solid plate parallel to the inclined bottom plate of each level, the upper end of the baffle is higher than the liquid surface, and the lower end extends into the lower part of the soaking tank.

[0016] As a further improvement of the present invention, the baffle of this stage extends from the front side of the upper shaft of the next stage to the top of the lower shaft of this stage.

[0017] As a further improvement of the present invention, the first-stage upper shaft is located above the discharge port, and the conveying chain is S-shaped and alternately bypasses the conveying sprockets of the lower shaft and the upper shaft of each stage in turn. After bypassing the conveying sprocket of the first-stage upper shaft, it passes through the guide rail on the feed side and then bypasses the conveying sprocket of the last-stage lower shaft to form a closed loop, and scrapers are evenly arranged along the circumference of the conveying chain.

[0018] As a further improvement of the present invention, the baffles at each level and the lower end surface of the next level inclined bottom plate form a downward tunnel for materials, and the upper end surface of the previous level inclined bottom plate form an upward tunnel for materials; the scraper descends along the baffles and ascends along the inclined bottom plate.

[0019] As a further improvement of the present invention, the planes where the axis of the lower shaft of this level and the axis of the upper shaft of this level are located intersect with the inclined bottom plate and the baffle of this level at an acute angle; the upper end of the inclined bottom plate is higher than the horizontal plane where the axis of the upper shaft is located, and the upper end of the baffle is close to the horizontal plane where the axis of the upper shaft is located.

[0020] As a further improvement of the present invention, a new solution spray pipe is provided on the upper front side of the box body, and the new solution is sprayed on the middle section of the inclined bottom plate of the first-stage immersion tank; the liquid level of the previous-stage immersion tank is higher than that of the next-stage immersion tank, and a concentrated solution outlet is provided on the rear wall of the final-stage immersion tank, and a baffle plate extending under the liquid surface is provided on the front side of the concentrated solution outlet, and a concentrated mixing sedimentation zone is formed between the baffle plate and the rear wall of the final-stage immersion tank.

[0021] As a further improvement of the present invention, a solid material feed port is provided at the rear part of the top wall of the box body, and the solid material feed port is located above the last-stage baffle; a semi-fluid material feed port is provided in front of the solid material feed port, and a feed platform is provided below the semi-fluid material feed port, and the feed platform is located above the last-stage upper shaft.

[0022] As a further improvement of the present invention, the first-stage upper shaft is higher than the upper shafts of each level, and a discharge side guide rail supported under the conveying chain is provided below the rear side of the first-stage upper shaft; the feed side guide rail is located on the front side of the solid material feed port and above the rear side of the last-stage upper shaft.

[0023] As a further improvement of the present invention, a certain upper shaft serves as the main drive shaft, and the main drive shaft is driven by a reducer; the remaining part or all of the upper shaft serves as the auxiliary drive shaft, and the auxiliary drive shaft is synchronously driven by the main drive shaft; the auxiliary drive sprocket is installed on the shaft end of the auxiliary drive shaft through an expansion sleeve.

[0024] As a further improvement of the present invention, a feed regulating gate is provided at the upper rear of the last-stage baffle, and the feed regulating gate includes a worm gear driver, a handwheel is installed at the driving end of the worm shaft of the worm gear driver, a transmission shaft is fixed to the center of the worm wheel of the worm gear driver, the middle section of the transmission shaft is sealingly supported at the center of the gate flange sealing plate through a transmission shaft bearing seat, a transmission sleeve is fixed to the inner end of the transmission shaft, an active swing plate is fixedly connected to the outer periphery of the transmission sleeve, the free end of the active swing plate is fixedly connected to one end of the arc gate plate, the other end of the arc gate plate is fixedly connected to a driven swing plate, the fixed end of the driven swing plate is fixedly connected to a driven shaft, and the driven shaft is supported in the driven end bearing seat and is coaxial with the transmission shaft.

[0025] As a further improvement of the present invention, a stop arm is fixedly connected to the housing of the worm gear drive, and the stop arm is fixedly connected to the transmission shaft bearing seat support ear on the outer wall of the transmission shaft bearing seat by bolts, the middle part of the transmission shaft bearing seat is welded in the center hole of the gate flange sealing plate, and the inner end face of the gate flange sealing plate is provided with a sealing plate positioning boss, and the radius of the sealing plate positioning boss is larger than the rotation radius of the arc gate plate.

[0026] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The solvent and wet meal are always in countercurrent immersion contact in the tunnel formed by the inclined bottom plate and the baffle, and a forced mass transfer process is carried out, so that a very high extraction power is always maintained.

[0027] 2. After the new solution enters the first-stage immersion tank, it automatically overflows backwards step by step by utilizing the liquid level difference, and flows in a zigzag manner through the baffles. The effective working path is long, and the solution fully contacts and transfers mass with the material in each extraction unit, and short-circuiting along the surface flow will not occur.

[0028] 3. The material undergoes the steps of immersion, solid-liquid mixing, scooping out, washing and draining in each extraction unit. The solid material finally enters the first-stage immersion tank, is fully mixed with the fresh solvent, is scooped up and drained by the scraper, and is discharged out of the machine.

[0029] 4. After each stage of extraction, the solid material has an obvious draining section on the inclined bottom plate. Before the solid material enters the next stage of immersion, the concentrated extract in the solid material is fully drained, which is easy to form a concentration gradient in each stage of immersion tanks, so that the extract has a greater extraction power; each stage of the extract has added a baffle channel, and the flow of the liquid is more orderly and reasonable, which fully conforms to the extraction principle, can improve the extraction efficiency by more than 20%, and can form an advantageous extraction process for powdered or semi-fluid solids.

[0030] 5. The independent conveying chains of each extraction unit are integrated into a common set of built-in conveying chains. Through multi-axis guide turning, the solid materials can move with the conveying chain. The whole machine can achieve reliable transmission with a single reducer. The structure is simple, the risk of material blocking is small, the control is convenient, and there are few failure points. At the same time, the manufacturing cost and maintenance cost are reduced, and the reliability of the equipment is improved.

[0031] 6. Even if the external transmission chain has abnormal working conditions, the built-in conveyor chain can still operate reliably, avoiding emergency shutdown due to failure, thus improving the reliability and safety of the equipment.

[0032] 7. Aiming at the dangerous environment where the extraction equipment contains flammable and explosive organic solvents, the sealing difficulty and leakage risk are reduced, and the production environment is improved.

[0033] 8. It omits a large number of mixed oil circulation pumps, complex pipelines and control systems, is easy to use and has low operating costs. The equipment has a simple internal structure, high strength, strong adaptability to materials, easy operation and use, and low maintenance requirements, making it suitable for use in underdeveloped areas or simple environments.

[0034] 9. It meets the requirements of skid-mounted use, has compact dimensions, and the length, width, and height of the equipment are strictly controlled. It can be transported by ordinary vehicles, has convenient road transportation, and has strong mobility, meeting the needs of mobile operations such as oil drilling waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 It is a front view of the step-tunnel type leaching device of the present invention;

[0037] Figure 2 for Figure 1 A top view of

[0038] Figure 3 is a cross-sectional view of a step-tunnel type leacher of the present invention;

[0039] Figure 4 It is a three-dimensional diagram of the step-tunnel type leaching device of the present invention;

[0040] Figure 5 It is a three-dimensional enlarged view of a soaking tank in the present invention;

[0041] Figure 6 is a three-dimensional diagram of the driving mechanism of the present invention;

[0042] Figure 7 is a cross-sectional view of the auxiliary drive sprocket in the present invention;

[0043] Figure 8 It is a three-dimensional diagram of the stall alarm mechanism in the present invention;

[0044] Fig. 9 It is the front view of the lower shaft in the present invention;

[0045] Fig.10 for Fig. 9 Left view of

[0046] Fig.11 It is a stereogram of the lower shaft in the present invention;

[0047] Fig.12 for Fig.11 A cross-sectional view of

[0048] Fig.13 This is a front view of the feed regulating gate in the present invention;

[0049] Fig.14 for Fig.13 A top view of

[0050] Fig.15 for Fig.13 Left view of

[0051] Fig.16 for Fig.14 A magnified view of the middle drive end;

[0052] Fig.17 for Fig.13 Stereoscopic diagram.

[0053] In the figure: 1. Box; 1a. Solid material feed port; 1b. Semi-fluid material feed port; 1c. Feeding platform; 1d. Discharge port; 1e. Box overflow port; 1f. Free gas interface; 1g. Inspection door; 1h. Horizontal support rail; 1j. Feed side guide rail; 1k. Discharge side guide rail; 1m. Temporary storage bucket;

[0054] 2. Feed regulating gate; 2a. Hand wheel; 2b. Worm gear drive; 2b1. Anti-rotation arm; 2c. Transmission shaft; 2c1. Locking nut; 2d. Transmission shaft bearing seat; 2d1. Transmission shaft bearing seat lug; 2d2. Gland; 2d3. Bearing shell; 2d4. Transmission shaft sealing ring; 2e. Transmission sleeve; 2f. Active swing plate; 2g. Arc gate plate; 2h. Rib plate; 2h1. Evacuation gap; 2j. Driven swing plate; 2k. Driven shaft; 2m. Driven end bearing seat; 2n. Gate flange sealing plate; 2n1. Sealing plate positioning boss; 2p. Gate sealing plate sealing gasket;

[0055] 3. Soaking tank; 3a. Wall panel; 3b. Arc bottom; 3c. Sloping bottom plate; 3d. Filter grid plate; 3e. Concentrated solution outlet; 4. Baffle plate; 5. Baffle plate; 6. Concentrated solution settling area;

[0056] 7. Lower shaft; 7a. Lower shaft conveying sprocket; 7b. Left-handed bushing; 7b1. Left-handed thread; 7c. Right-handed bushing; 7c1. Right-handed thread; 7d. Sliding bearing; 7d1. Outer flange of sliding bearing; 7e. Lower shaft bearing seat; 7e1. Outer flange of lower shaft bearing seat; 7e2. Screw of lower shaft bearing seat; 7f. Lower shaft flange sealing plate; 7g. Cover; 7g1. Inner convex ring of cover; 7g2. Screw of cover; 7g3. Cover sealing gasket; 7h. Sealing gasket of lower shaft bearing seat; 7j. Sealing gasket of lower shaft flange;

[0057] 8. Upper shaft; 8a. Upper shaft conveying sprocket; 8-1. Main driving shaft; 8-1a. Large sprocket; 8-1b. Main driving sprocket; 8-2. Auxiliary driving shaft; 8-2a. Induction sheet; 8-2b. Proximity switch; 8-3. Discharging shaft;

[0058] 9. Auxiliary drive sprocket; 9a. Inner cone expansion sleeve; 9b. Outer cone expansion sleeve; 9c. Expansion screw; 10. Reducer; 11. Reducer transmission chain; 12. Auxiliary transmission chain; 13. Conveyor chain; 13a. Scraper; 14. Drain pipe; 15. New solution spray pipe. DETAILED DESCRIPTION

[0059] In the following description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which 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 position. In this article, the position close to the solid feed port is "back", and the position close to the discharge port is "front".

[0060] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0062] like Figures 1 to 6 As shown, the step tunnel type extractor of the present invention comprises a box 1, the rear end of the box 1 is a feed end, and the front end is provided with a discharge port 1d opening downward. The interior of the box 1 is a solvent environment, and each connection surface, flange, etc. meet the airtightness requirements. The outer shell is arranged with an integral flange connection surface, which plays the role of strengthening the rigidity of the shell, improving the manufacturing accuracy and improving the sealing. The inner cavity of the box is provided with multiple soaking units from front to back, the first soaking unit is close to the discharge port 1d, and the last soaking unit is located at the rear end of the box.

[0063] Each soaking unit comprises a soaking tank 3, a baffle 4, a lower shaft 7 and an upper shaft 8. The soaking tank 3 comprises a wall panel 3a, an arc bottom 3b and an inclined bottom plate 3c which are connected in sequence. The arc bottom 3b accommodates the lower shaft 7 of this stage. The upper shaft 8 of this stage is respectively located above the soaking tank of the previous stage. The upper shaft of the first stage is located above the discharge port 1d. The upper end of the inclined bottom plate 3c extends to the rear side of the upper shaft 8 of this stage. The upper end of the wall panel 3a is connected to the lower side of the inclined bottom plate 3c of the soaking tank of the next stage.

[0064] Lower shaft conveying sprockets 7a are installed at both ends of each level of lower shaft 7 located in the soaking tank, and the arc bottom 3b matches the bottom shape of the lower shaft conveying sprocket 7a, so that the lower shaft conveying sprocket 7a can rotate freely in the arc bottom 3b of the soaking tank.

[0065] Upper shaft conveying sprockets 8a are installed at both ends of each upper shaft 8 located in the box body 1 respectively. The same conveying chain 13 is S-shaped and alternately bypasses the lower shaft conveying sprockets 7a and the upper shaft conveying sprockets 8a of each level. After bypassing the first-stage upper shaft conveying sprocket 8a, it passes through the horizontal unloaded section and passes through the feed-side guide slide rail 1j to bypass the last-stage lower shaft conveying sprocket 7a again to form a closed loop. Scrapers are evenly arranged along the circumference of the conveying chain 13.

[0066] The feed side guide rail 1j is located at the front side of the solid material feed port 1a and above the rear side of the final stage upper shaft. The final stage lower shaft is located at the rear side of the solid material feed port 1a and below the conveying chain 13.

[0067] A horizontal support rail 1h is provided between the feed-side guide rail 1j and the discharge shaft, and is supported below the conveying chain 13 of the horizontal unloaded section.

[0068] Since the first-stage upper shaft is located higher as the discharge shaft 8-3 and can be further forward, a discharge side guide rail 1k is provided below the rear side of the discharge shaft 8-3 and supported below the conveying chain 13.

[0069] The inclined bottom plate 3c is parallel to the tangent between the front side of the lower shaft conveying sprocket 7a of this level and the rear side of the upper shaft conveying sprocket 8a of this level. The lower edge of the scraper goes down along the deflector 4 and goes up along the inclined bottom plate 3c.

[0070] The conveyor chain 13 ascends along the tangent between the front side of the lower shaft conveyor sprocket of this stage and the rear side of the upper shaft conveyor sprocket 8a of this stage, and descends along the tangent between the front side of the upper shaft conveyor sprocket 8a of this stage and the rear side of the lower shaft conveyor sprocket of the previous stage. The plane where the axis of the lower shaft of this stage and the axis of the upper shaft of this stage are located intersects with the inclined bottom plate and the baffle 4 of this stage at an acute angle.

[0071] Taking the six-stage extraction as an example, the one close to the discharge port 1d is the first-stage immersion tank, and the one far away from the discharge port 1d is the sixth-stage immersion tank. The first-stage lower axis is located at the bottom of the first-stage immersion tank, the second-stage lower axis is located at the bottom of the second-stage immersion tank, and so on. The sixth-stage lower axis is located at the bottom of the sixth-stage immersion tank.

[0072] The sixth-stage upper shaft is located at the front position above the fifth-stage immersion tank, the fifth-stage upper shaft is located at the front position above the fourth-stage immersion tank, and so on, the second-stage upper shaft is located at the front position above the first-stage immersion tank, and the heights of the second to sixth-stage upper shafts are the same. The first-stage upper shaft serves as the discharge shaft 8-3, and its axis height is higher than the axis heights of the second to sixth-stage upper shafts, and is located above the discharge port 1d.

[0073] After the conveying chain 13 passes around the conveying sprocket of the sixth-level lower shaft from the upper tilted downward, it turns to the upper tilted direction and passes around the conveying sprocket of the sixth-level upper shaft, then turns to the lower tilted direction and passes around the conveying sprocket of the fifth-level lower shaft, then turns to the upper tilted direction and passes around the conveying sprocket of the fifth-level upper shaft, and so on. After passing around the conveying sprocket of the second-level upper shaft, the conveying chain 13 turns to the lower tilted direction and passes around the conveying sprocket of the first-level lower shaft, then turns to the upper tilted direction again, and after turning through the discharge side guide rail 1k, it enters the conveying sprocket of the first-level upper shaft, i.e., the discharge shaft 8-3. After turning through the discharge shaft conveying sprocket, it enters the unloaded horizontal section and moves toward the feed side, and then turns through the feed side guide rail 1j, and then tilts downward and passes around the conveying sprocket of the sixth-level lower shaft to form a closed loop.

[0074] The conveying chains 13 on both sides of the inner cavity of the box body 1 are all whole chains, forming a group. The two ends of the scraper 13a are respectively fixed on the corresponding chain links of the conveying chain 13 and are evenly arranged along the circumference of the conveying chain 13. As the conveying chain 13 rotates, the scraper 13a pushes the material forward.

[0075] like Figure 6 As shown, since each level of soaking units shares a set of conveying chains 13, there is no speed difference along the circumference of the conveying chain 13, which greatly reduces the risk of material blocking. The device is driven by a single reducer 10, which greatly simplifies the control system.

[0076] In order to reduce the force on the conveying chain 13 in the box, reduce wear and improve reliability, an external series transmission chain drive is adopted. That is, the reducer 10 transmits the torque to the main drive shaft 8-1, and the main drive shaft 8-1 transmits it to the auxiliary drive shaft 8-2 via the auxiliary transmission chain 12, thereby ensuring that the conveying chain 13 in the box is always in a very small load state, achieving extremely high reliability.

[0077] Embodiment 1

[0078] The reducer 10 is installed at the feed end of the top of the box body, and the upper shaft close to the feed end, such as the sixth-stage upper shaft, is used as the main drive shaft 8-1, and the upper shaft in the middle and the upper shaft close to the discharge end are used as auxiliary drive shafts 8-2.

[0079] A large sprocket 8-1a and a main drive sprocket 8-1b are installed at the shaft end of the main drive shaft 8-1, and an auxiliary drive sprocket 9 is installed at the shaft end of the auxiliary drive shaft 8-2. The output sprocket of the reducer 10 is connected to the large sprocket 8-1a of the main drive shaft 8-1 through the reducer transmission chain 11, and the main drive sprocket 8-1b of the main drive shaft 8-1 is connected to the auxiliary drive sprocket 9 on the auxiliary drive shaft 8-2 through the auxiliary transmission chain 12.

[0080] The reducer 10 drives the large sprocket 8-1a on the main drive shaft 8-1 through the reducer transmission chain 11, and transmits the torque to the main drive shaft 8-1 while achieving deceleration. The main drive sprocket 8-1b drives the auxiliary drive sprocket 9 and the auxiliary drive shaft 8-2 to rotate through the auxiliary transmission chain 12. For example, the sixth-stage upper shaft drives the fourth-stage upper shaft to rotate through the auxiliary transmission chain 12, and the fourth-stage upper shaft drives the second-stage upper shaft to rotate through the auxiliary transmission chain 12.

[0081] Embodiment 2

[0082] The reducer is installed at the discharge end of the top of the box body, and the upper shaft close to the discharge end, such as the second-stage upper shaft, is used as the main drive shaft, and the upper shaft in the middle and the upper shaft close to the feed end are used as the auxiliary drive shaft 8-2.

[0083] The reducer drives the second-stage upper shaft as the main driving shaft to rotate, the second-stage upper shaft drives the fourth-stage upper shaft to rotate through the auxiliary transmission chain, and the fourth-stage upper shaft drives the sixth-stage upper shaft to rotate through the auxiliary transmission chain.

[0084] Embodiment 3

[0085] The reducer is installed in the middle position of the top of the box body, and the upper shaft close to the middle extraction unit, such as the fourth-stage upper shaft, is used as the main drive shaft, and the upper shaft close to the feed end and the upper shaft close to the discharge end are used as auxiliary drive shafts 8-2.

[0086] The reducer drives the fourth-stage upper shaft to rotate, and the fourth-stage upper shaft drives the second-stage upper shaft to rotate forward through the auxiliary transmission chain, and at the same time drives the sixth-stage upper shaft to rotate backward through the auxiliary transmission chain.

[0087] The baffle 4 is a solid plate, inserted in each soaking tank, parallel to the inclined bottom plates 3c at each level, with the upper end above the liquid surface and the lower end protruding into the lower part of the soaking tank, forcing the extract in the front of the soaking tank to bypass the lower edge of the baffle 4 and fully contact and exchange with the material before reaching the rear of the soaking tank, thereby extending the flow path length of the extract. It prevents the upper low-concentration extract from flowing directly backwards, and the effective working path is long without short circuit.

[0088] Each level of baffles 4 has another function, which is to form a descending tunnel for materials with the lower end surface of the next level of inclined bottom plate, and to form an ascending tunnel for materials with the upper end surface of the previous level of inclined bottom plate. It ensures that the solvent and solute are in countercurrent contact in the tunnel formed by the inclined bottom plate of the immersion tank and the baffles 4. The tortuous tunnel limits the movement path of the solid material and the extract, increases the frequency, path and duration of the countercurrent contact between the solute and the solvent, and strengthens the mass transfer process of the extraction. The stepped tunnel countercurrent immersion forms an advantageous extraction process for powdered or semi-fluid solids.

[0089] There are two feed ports at the rear of the top wall of the box. The rear side is the solid material feed port 1a, which is located above the final baffle and can be used to feed solid materials. The solid material feed port 1a is equipped with a temporary storage bucket 1m. The materials accumulated in the temporary storage bucket 1m are used to isolate the container from the atmosphere to prevent the volatile solvent in the container from escaping and causing harm or loss.

[0090] A feed regulating gate 2 is provided above the rear of the last baffle, and the gate height can be adjusted to control the distance from the last baffle, thereby controlling the feed amount and preventing the tunnel from silting up and blocking due to uncontrolled feed. Shallow material layer immersion extraction is usually adopted, and the material layer height is controlled at 100-400mm according to the material properties.

[0091] Another feed port is a semi-fluid material feed port 1b, located in front of the solid material feed port 1a, for semi-fluid materials with strong fluidity, such as thick pastes and semi-slurries. A feed platform 1c is arranged below the semi-fluid material feed port 1b. The feed platform 1c is located above the last-stage upper shaft and can carry materials with strong fluidity.

[0092] Continuous extraction generally adopts six-stage extraction. The solid raw material falls into the sixth-stage immersion tank through the solid material feed port 1a, and is pushed down along the baffle of the sixth stage by the scraper to contact the concentrated mixed oil in the sixth-stage immersion tank. The solid material falls from the bottom of the baffle into the arc bottom 3b of the sixth-stage immersion tank, and is picked up and pushed by the chain scraper device, and moves up along the inclined bottom plate of the sixth stage. When it is separated from the liquid surface, the solid material is drained, and the free mixed oil in the solid material is discharged. Then, it falls from the inclined bottom plate of the sixth stage to the baffle of the fifth stage, and is pushed down along the baffle of the fifth stage by the scraper to contact the concentrated mixed oil in the fifth-stage immersion tank. And so on, continuous extraction is carried out. For materials that are difficult to extract, the number of stages can be appropriately increased.

[0093] The inclined bottom plate 3c is relatively high and long, close to the upper axis and significantly above the liquid level. The inclined plate section above the liquid level is used to drain the wet meal, thereby reducing the concentrated mixed content in the wet meal, making the concentration gradient of each level of soaking tank obvious, and each level of extraction has a greater extraction power.

[0094] There is an obvious draining section on the inclined bottom plate 3c of each soaking tank, so that the concentrated extract in the solid material can be fully drained before the solid material enters the next soaking stage, which makes it easy to form a concentration gradient in the soaking tanks of each level and maintain a large extraction power for the extract.

[0095] The upper end of the inclined bottom plate 3c can be higher than the horizontal plane where the upper shaft axis is located, so that the box has a higher liquid level and has a longer upward extraction stroke along the inclined bottom plate 3c. After falling from the top of the inclined bottom plate 3c to the previous level baffle, the landing point is higher and has a longer downward extraction stroke along the baffle 4.

[0096] The baffle of this stage extends from the front side of the upper shaft of the next stage to the top of the lower shaft 7 of this stage. The upper end of the baffle 4 can be close to the horizontal plane where the axis of the upper shaft is located. A small amount of material that passes over the upper shaft sprocket can also be received by the baffle 4 and enter the downward tunnel for extraction.

[0097] The upper part of each level of inclined bottom plate 3c except the first level is provided with filter grid plates 3d, which are narrow at the top and wide at the bottom to avoid clogging. The lower edge height of the filter grid plates of the previous level is successively higher than the lower edge height of the filter grid plates of the next level. The filter grid plates on the new solution side are at the highest position, and the positions of the filter grid plates on the concentrated mixing side are gradually reduced. The lower edges of the filter grid plates 3d of each level are all higher than the top of the wall plate 3a of the previous soaking tank.

[0098] Under the action of the inter-stage liquid level difference, the high-level extract on the low-concentration side penetrates the filter grid 3d and passes through the solid material on the filter grid 3d at the same time, achieving preliminary washing of the solid material and replacing the concentrated extract in the solid material, breaking the original concentration balance in the solid material, so as to facilitate the establishment of a new mass transfer balance when entering the next stage of immersion.

[0099] The solid material can be drained quickly at the upper part of each level of the filter grating 3d. The filter grating 3d can extend to the top of the inclined bottom plate 3c, and can be arranged in sections or as a whole in the width direction of the inclined bottom plate 3c.

[0100] There is no filter grid on the inclined bottom plate of the first-stage soaking tank, but the height is higher so that the material can be fully drained before discharge.

[0101] A new solution spray pipe 15 is provided above the first-stage soaking tank. The nozzle of the new solution spray pipe 15 can be aimed at the junction where the wet meal of the first-stage soaking tank is separated from the liquid surface. The wet meal separated from the first-stage soaking tank is washed again with the new solution before entering the final draining section. The new solution spray pipe 15 can also be set on the top of the box body, located above the conveying chain 13 of the unloaded horizontal section. The sprayed new solution can clean the conveying chain 13 and its scraper and enter the next cycle.

[0102] Still taking the six-stage extraction as an example, fresh solvent is sprayed into the material ascending tunnel of the first-stage immersion tank. After being fully mixed and mass transferred with the solid phase to be discharged, the new solvent flows downward in the opposite direction and enters the first-stage material descending tunnel from the lower edge of the first-stage baffle and the bottom of the first-stage immersion tank. The solvent flows upward along the material descending tunnel formed by the first-stage baffle and the second-stage inclined bottom plate, penetrates or infiltrates the solid material in the filter grid section of the second-stage inclined bottom plate, enters the second-stage immersion tank, and so on, and finally flows into the sixth-stage immersion tank.

[0103] The inclined bottom plate of each immersion tank is equipped with a filter grid 3d, which realizes gravity flow by using the liquid level difference. The fresh solvent and the solid phase are in countercurrent contact. The liquid level on the new solvent side is high due to the continuous injection of new solvent, and the liquid level on the concentrated mixed side is low due to the set liquid level. A significant liquid level difference is formed in the equipment, realizing the continuous permeation flow of liquid from high to low. The side wall of the first-stage immersion tank is provided with a box overflow port 1e to control the highest liquid level to ensure safety.

[0104] A concentrated solution outlet 3e is provided on the rear wall of the final immersion tank, and a baffle plate 5 extending below the liquid surface is provided on the front side of the concentrated solution outlet 3e to separate the concentrated solution outlet 3e from the descending materials. A concentrated mixing sedimentation zone 6 is formed between the baffle plate 5 and the rear wall of the final immersion tank. After the powder material is settled, the concentrated solution is discharged.

[0105] Each stage of material extraction process includes four steps: immersion, solid-liquid mixing, scooping out, and draining. The solute concentration in the new solid material is the highest and it contacts with the concentrated solvent with the highest concentration, which has a higher extraction power; the solute concentration in the solid material to be discharged is the lowest and it contacts with the new solvent with the lowest concentration, which still has a higher extraction power. Finally, the solid material is fully mixed with the fresh solvent in the first stage immersion tank, scooped up and drained by the scraper, and discharged from the discharge port 1d.

[0106] The top of the box is still provided with a free gas interface 1f and an inspection door 1g. The lowest point of the arc-shaped bottom 3b of each soaking tank is respectively provided with an emptying port, and each emptying port is connected to an emptying pipe 14, which is convenient for emptying when overhauling or changing batches.

[0107] like Figure 7 As shown, due to the phase difference between the built-in conveying sprocket on the auxiliary drive shaft 8-2 and the external auxiliary drive sprocket 9, when the conveying sprocket is properly tensioned, the phase of the auxiliary drive sprocket 9 and the matching sprocket must be randomly adjusted to meet the meshing needs of the external auxiliary transmission chain. The center hole of the auxiliary drive sprocket 9 is built with an expansion sleeve, specifically, the step inside the center hole is against the inner cone expansion sleeve 9a, the inner cone expansion sleeve 9a is inserted and matched with the outer cone expansion sleeve 9b, the outer cone expansion sleeve 9b is sleeved on the corresponding auxiliary drive shaft 8-2, and the outer end surface of the outer cone expansion sleeve 9b is evenly distributed with a plurality of expansion screws 9c, and the inner end of each expansion screw 9c is screwed into the screw hole of the inner cone expansion sleeve 9a.

[0108] By loosening the expansion screws 9c, the phase angle can be adjusted as needed; after the adjustment is in place, the expansion screws 9c can be tightened to tighten the expansion sleeve. This structure can effectively transmit torque and is also convenient for assembly and disassembly.

[0109] Even if the special working condition of the expansion sleeve of the external auxiliary drive sprocket 9 slips, the equipment can still operate continuously. The load traction force is transferred from the external transmission chain to the internal conveying chain 13. There is no problem in short-term operation, which avoids emergency shutdown caused by failure and improves the reliability and safety of the equipment. Long-term operation will aggravate the wear of the internal conveying chain 13, and it is advisable to use the production gap to carry out maintenance as soon as possible.

[0110] like Figure 8 As shown, the auxiliary drive shaft 8-2 is equipped with a stall alarm mechanism, which can be in various forms, such as installing a sensing piece 8-2a at the shaft end of the auxiliary drive shaft 8-2, and evenly providing a plurality of signal teeth on the circumference of the sensing piece 8-2a, and a proximity switch 8-2b or an encoder detects the speed of the sensing piece 8-2a and provides it to the control system. When the expansion sleeve just slips, the auxiliary drive shaft 8-2 will instantly stall, the stall alarm mechanism sends a signal, and the control system sends an alarm signal to inform the operator of the working condition, which is convenient for maintenance and repair.

[0111] like Figures 9 to 12 As shown, the lower shaft 7 includes an immersed section located in the immersion tank and shaft heads located at both ends, and the two ends of the immersed section are respectively provided with finely machined large diameter sections, and the circumference of the large diameter section is respectively fitted with a lower shaft conveying sprocket 7a, and the inner hole of the lower shaft conveying sprocket 7a is fixed to the large diameter section through a flat key, and a locking screw is screwed on the flange of the lower shaft conveying sprocket 7a to rest on the flat key. The two lower shaft conveying sprockets 7a and the immersed section of the lower shaft 7 are immersed in the solvent and are located in the immersion tank near the walls on both sides, and are used for driving the chain. The scrapers evenly fixed on the chain turn around the axis of the lower shaft 7 and drive the material at the bottom of the immersion tank to move upward.

[0112] The two shaft heads respectively pass through the side walls of the immersion tank. The left shaft head is provided with a left-handed bushing 7b, and the outer periphery of the left-handed bushing 7b is provided with a left-handed thread 7b1; the right shaft head is provided with a right-handed bushing 7c, and the outer periphery of the right-handed bushing 7c is provided with a right-handed thread 7c1, and the left and right bushings are used in pairs; the inner ends of the left-handed bushing 7b and the right-handed bushing 7c respectively rest on the shoulders at the roots of the shaft heads.

[0113] The inner holes of the left-handed bushing 7b and the right-handed bushing 7c are interference fit with the corresponding shaft heads, and the outer walls of the left-handed bushing 7b and the right-handed bushing 7c are clearance fit with the inner holes of the corresponding sliding bearings 7d.

[0114] The rotation speed of the lower shaft 7 is very low, usually in the range of 0.1-0.5rpm. The left-handed bushing 7b and the right-handed bushing 7c can be made of martensitic stainless steel, and the sliding bearing 7d can be made of ductile iron and other materials, with a loose fit. Because the load of the lower shaft 7 is light and the rotation speed is very slow, the sliding bearing 7d can also meet the life requirements without lubrication;

[0115] When the lower shaft 7 rotates, the left-handed thread 7b1 discharges to the right, that is, discharges to the immersion tank where the immersion section is located; the right-handed thread 7c1 discharges to the left, also discharges to the immersion tank where the immersion section is located. Both the left-handed thread 7b1 and the right-handed thread 7c1 are trapezoidal threads, and the trapezoidal threads at both ends continuously push the incoming powder outward to prevent the powder from accumulating on the inner wall of the sliding bearing 7d, resulting in increased friction or locking.

[0116] The outer walls of the two sliding bearings 7d are respectively embedded in the corresponding lower shaft bearing seats 7e. The root peripheries of the sliding bearings 7d are respectively provided with sliding bearing outer flanges 7d1. The sliding bearing outer flanges 7d1 are respectively embedded in the inner ring grooves of the corresponding lower shaft bearing seats 7e to achieve axial positioning of the sliding bearings 7d and the lower shaft bearing seats 7e.

[0117] The outer ports of the two lower shaft bearing seats 7e are respectively covered with blind covers 7g, and the inner end faces of the blind covers 7g are respectively provided with blind cover inner convex rings 7g1, which are respectively embedded in the outer ports of the corresponding lower shaft bearing seats 7e, so as to facilitate the automatic alignment of the blind covers 7g and the lower shaft bearing seats 7e and improve the sealing performance; a gap is left between the blind cover inner convex ring 7g1 and the outer end face of the bushing.

[0118] The outer port of the lower shaft bearing seat 7e is evenly distributed with a plurality of screw holes for fixing, and the outer circumference of the blind cover 7g is evenly provided with a plurality of blind cover fixing holes, and blind cover sealing gaskets 7g3 are respectively provided between the outer port of the lower shaft bearing seat 7e and the outer circumference of the blind cover 7g, and each blind cover screw 7g2 is respectively passed through the blind cover fixing hole and the through hole on the blind cover sealing gasket 7g3 and screwed into the corresponding screw hole of the lower shaft bearing seat 7e to fix the blind cover 7g on the lower shaft bearing seat 7e and realize mutual sealing between the two.

[0119] The roots of the two lower shaft bearing seats 7e are respectively inserted into the center holes of the corresponding lower shaft flange sealing disk 7f to achieve accurate center positioning of the two. The outer periphery of the lower shaft bearing seat 7e near the root is respectively provided with a lower shaft bearing seat outer flange 7e1, and a lower shaft bearing seat sealing gasket 7h is provided between the lower shaft bearing seat outer flange 7e1 and the facing end surface of the lower shaft flange sealing disk 7f. The outer end surface of the lower shaft flange sealing disk 7f is provided with a lower shaft flange sealing disk center outer sink groove at the position corresponding to the lower shaft bearing seat outer flange 7e1, and half the thickness of the lower shaft bearing seat sealing gasket 7h is embedded in the lower shaft flange sealing disk center outer sink groove to quickly and accurately achieve positioning.

[0120] There are multiple lower shaft bearing seat fixing holes evenly distributed on the outer flange 7e1 of the lower shaft bearing seat. Each lower shaft bearing seat screw 7e2 passes through the lower shaft bearing seat fixing hole and the through hole on the lower shaft bearing seat sealing gasket 7h and is screwed into the corresponding screw hole of the lower shaft flange sealing disk 7f, thereby fixing the lower shaft bearing seat 7e to the lower shaft flange sealing disk 7f and achieving mutual sealing.

[0121] The outer edges of the inner end surfaces of the two lower shaft flange sealing disks 7f are respectively provided with lower shaft flange sealing disk inner ring grooves, in which lower shaft flange sealing disks 7j are respectively embedded, so that the lower shaft flange sealing disk 7j can be pre-installed on the lower shaft flange sealing disk 7f and automatically ensure centering, and the lower shaft flange sealing disk 7j is respectively pressed against the outer wall of the immersion tank to achieve sealing.

[0122] There are multiple lower shaft flange sealing disk fixing holes evenly distributed on the outer circumference of the two lower shaft flange sealing disks 7f. Each lower shaft flange sealing disk screw passes through the lower shaft flange sealing disk fixing hole and the corresponding through hole on the lower shaft flange sealing gasket 7j and is screwed into the screw hole on the side wall of the immersion tank to seal and fix the lower shaft flange sealing disk on the side wall of the immersion tank.

[0123] During installation, the flange sealing disks 7f of each lower shaft can be fixed first, and then the lower shaft 7 can be installed. When installing the lower shaft 7, the left-handed bushing 7b and the right-handed bushing 7c can be preheated and then mounted on the two shaft heads of the lower shaft 7, and they will automatically tighten to achieve interference fit after cooling; then the lower shaft conveying sprocket 7a is installed at both ends of the submerged section of the lower shaft 7, and then the lower shaft 7 is hoisted as a whole into the inner cavity of the immersion tank, and the two ends of the lower shaft 7 extend out from the center hole of the flange sealing disk of the lower shaft.

[0124] When installing the shaft end, first embed the sliding bearing 7d in the lower shaft bearing seat 7e, embed the lower shaft bearing seat sealing gasket 7h in the center outer groove of the lower shaft flange sealing disk, then put the sliding bearing 7d on the corresponding bushing, push it inward until the inner end of the lower shaft bearing seat 7e is inserted into the center hole of the lower shaft flange sealing disk, then screw in each lower shaft bearing seat screw 7e2 to fix the lower shaft bearing seat 7e on the lower shaft flange sealing disk 7f; finally, install the cover sealing gasket 7g3 and the cover 7g.

[0125] After long-term operation, the left-hand bushing 7b, the right-hand bushing 7c, the sliding bearing 7d or the lower shaft conveying sprocket 7a can be replaced. The lower shaft 7 and other components do not need to be replaced, and the spare parts loss is low. The order of disassembly is opposite to that of installation.

[0126] like Figures 13 to 17 As shown, the feed regulating gate 2 includes a worm gear driver 2b, a transmission shaft 2c, a transmission shaft bearing seat 2d, a transmission sleeve 2e, an active swing plate 2f, an arc gate plate 2g, a driven swing plate 2j, a driven shaft 2k and a driven end bearing seat 2m. The worm gear in the worm gear driver 2b is driven by a worm to rotate, a hand wheel 2a is installed at the driving end of the worm shaft, and a transmission shaft 2c is fixed at the center of the worm wheel. The middle section of the transmission shaft 2c is sealed and supported at the center of the gate flange sealing plate 2n through the transmission shaft bearing seat 2d.

[0127] A stop arm 2b1 is fixedly connected to the shell of the worm gear drive 2b, and a transmission shaft bearing seat lug 2d1 is welded to the outer wall of the transmission shaft bearing seat 2d. The outer end of the stop arm 2b1 is fixedly connected to the transmission shaft bearing seat lug 2d1 by a stop bolt, and a spacer is mounted on the outer periphery of the middle section of the stop bolt, and the spacer is supported between the facing end faces of the stop arm 2b1 and the transmission shaft bearing seat lug 2d1. After the nut of the stop bolt is tightened, the worm gear drive 2b is relatively fixed to the transmission shaft bearing seat 2d and the gate flange sealing plate 2n.

[0128] The two ports of the transmission shaft bearing seat 2d are respectively fixed with glands 2d2, the outer end of the gland 2d2 is provided with a gland flange edge, the gland flange edge is fixed to the port of the transmission shaft bearing seat 2d by a gland screw, and gland sealing gaskets are respectively provided between the gland flange edge and the port of the transmission shaft bearing seat 2d to ensure the port sealing.

[0129] The centers of the two glands 2d2 are provided with gland center sleeves, which are inserted into the inner cavity of the transmission shaft bearing seat 2d facing each other. The inner cavities of the gland center sleeves are respectively installed with bearing bushes 2d3, which are copper-based solid lubricating bearings and are respectively sleeved on the transmission shaft 2c. The maximum diameter section of the transmission shaft 2c is between the two bearing bushes 2d3, and the maximum diameter section is located in the middle of the inner cavity of the transmission shaft bearing seat 2d. An inner step is provided in the gland center hole, and the two bearing bushes 2d3 respectively abut against the inner side of the inner step of the gland center hole.

[0130] The outer ports of the two glands 2d2 are respectively embedded with transmission shaft sealing rings 2d4, which are skeleton oil seals, and at least two are provided at each end to ensure the reliability of the seal. The inner skeleton oil seal rests against the outer side of the step in the center hole of the gland.

[0131] The middle part of the transmission shaft bearing seat 2d is welded in the center hole of the gate flange sealing plate 2n. The gate flange sealing plate 2n is circular, and multiple flange bolt holes are evenly distributed on the outer circumference. Each screw passes through the flange bolt hole to fix the gate flange sealing plate 2n to one side wall plate of the extractor. The inner end surface of the gate flange sealing plate 2n is provided with a sealing plate positioning boss 2n1, which is embedded in the mounting hole of the extractor wall plate to facilitate the rapid alignment of the gate flange sealing plate 2n and the mounting hole. A gate sealing plate sealing gasket 2p is provided between the flange edge of the gate flange sealing plate 2n and the extractor wall plate to achieve sealing.

[0132] The inner end of the transmission shaft 2c is provided with a tapered section and a threaded section, and a transmission sleeve 2e is mounted on the tapered section. The inner tapered hole of the transmission sleeve 2e matches the tapered section of the transmission shaft 2c. A locking nut 2c1 is screwed on the threaded section of the transmission shaft 2c. A cap nut is screwed on the outer side of the locking nut 2c1. The locking nut 2c1 is pressed against the end face of the transmission sleeve 2e through a gasket to fix the transmission sleeve 2e on the transmission shaft 2c.

[0133] The outer periphery of the transmission sleeve 2e is fixedly connected with an active swing plate 2f, which can be provided with two parallel active swing plates 2f, and the free ends of the two active swing plates 2f are fixedly connected to one end of the arc gate plate 2g. The active swing plate 2f is a fan-shaped circular arc plate, and the arc outer edge can be welded to the inner arc surface of the arc gate plate 2g.

[0134] The other end of the arc gate plate 2g is fixedly connected with a driven swing plate 2j, which is also a fan-shaped arc plate, and can also be provided with two parallel to each other, and the arc outer edge can be welded to the inner arc surface of the arc gate plate 2g. A driven shaft 2k is inserted into the center hole of the two driven swing plates 2j, and the arc gate plate 2g is coaxial with the transmission shaft 2c and the driven shaft 2k. The driven shaft 2k is supported in the driven end bearing seat 2m, and the driven end bearing seat 2m is fixed to the inner side of the wall plate on the other side of the extractor.

[0135] The inner arc surface of the arc gate plate 2g is welded with a rib plate 2h, which is located between the active swing plate 2f and the driven swing plate 2j. The rib plate 2h has a trapezoidal cross section, with the convex top edge facing outward, and the upper and lower edges are welded to the inner arc surface of the arc gate plate 2g, and the lower edge is evenly provided with multiple emptying notches 2h1 to prevent material accumulation inside the rib plate 2h.

[0136] The radius of the sealing plate positioning boss 2n1 is larger than the rotation radius of the arc-shaped gate plate 2g, so as to facilitate installation or removal of the regulating gate from the installation hole on one side of the extractor.

[0137] During the operation of the extractor, when the feed amount needs to be adjusted, no disassembly is required. The hand wheel 2a can be directly turned to adjust it. When the hand wheel 2a rotates one circle, the worm gear drives the transmission shaft 2c to rotate a phase angle of one tooth. The transmission shaft 2c drives the arc gate 2g to rotate the same phase angle through the transmission sleeve 2e and the active swing plate 2f. The lower edge of the arc gate 2g further cuts into or exits the feed channel to adjust the feed amount. The outer wall of the worm gear driver 2b is provided with a dial indicating the opening of the arc gate 2g, which is convenient for precise control.

[0138] During the adjustment process, the driven shaft 2k involved in the seal only needs to rotate, and does not need axial movement. Moreover, the rotation angle of each adjustment is very small, usually not exceeding 45°, and there is no need to rotate continuously for several weeks. The skeleton oil seal is not easy to wear, has a very long service life, reliable sealing, and high safety.

[0139] The above is only a preferred embodiment of the present invention, which shows and describes the basic principles and main features of the present invention and the advantages of the present invention, but does not limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. In addition to the above embodiments, the present invention may have other implementation modes without departing from the spirit and scope of the present invention. The present invention may also have various changes and improvements, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents. The technical features not described in the present invention can be realized by or using existing technologies, which will not be repeated here.

Claims

1. A stepped tunnel type extractor, comprising a sealed box, wherein the rear end of the box is a feed end, and the front end is provided with a discharge port, characterized in that: The inner cavity of the box is provided with multiple soaking units from front to back, each soaking unit comprises a soaking tank, a lower shaft and an upper shaft, each lower shaft is located at the bottom of the soaking tank of the same level, each upper shaft is located above the soaking tank of the previous level, and a conveying chain is wrapped between the lower shaft and the upper shaft; The first-stage soaking tank is close to the discharge port, and each stage of the soaking tank includes a wall panel, an arc-shaped bottom and an inclined bottom plate which are connected in sequence. The lower shaft of this stage is immersed in the arc-shaped bottom of the soaking tank of this stage, and the upper end of the inclined bottom plate extends to the rear side of the upper shaft of this stage. The upper end of the wall panel is connected to the lower side of the inclined bottom plate of the next soaking tank; The upper part of each level of inclined bottom plate except the first level is respectively provided with a filter grid plate for draining the material, and the height of the lower edge of the filter grid plate decreases step by step from front to back and is higher than the top of the wall plate; The first-stage upper shaft is located above the discharge port, and the conveying chain is S-shaped and alternately passes around the conveying sprockets of the lower shaft and the upper shaft at each stage. After passing around the conveying sprocket of the first-stage upper shaft, it passes around the conveying sprocket of the last-stage lower shaft again through the guide rail on the feed side to form a closed loop, and scrapers are evenly arranged along the circumference of the conveying chain.

2. The step tunnel type extractor according to claim 1, characterized in that: Each level of soaking unit is also provided with a baffle, each baffle is a solid plate parallel to each level of inclined bottom plate, the upper end of the baffle is higher than the liquid surface, and the lower end extends into the lower part of the soaking tank.

3. The step tunnel type extractor according to claim 2, characterized in that: The baffle of this stage extends from the front side of the upper shaft of the next stage to the top of the lower shaft of this stage.

4. The step tunnel type extractor according to claim 2, characterized in that: The baffles of each level and the lower end surface of the inclined bottom plate of the next level form a descending tunnel for materials, and form an ascending tunnel for materials with the upper end surface of the inclined bottom plate of this level; the scraper descends along the baffles and ascends along the inclined bottom plate.

5. The step-tunnel type extractor according to claim 2, characterized in that: The planes where the lower axis and the upper axis of this level are located intersect with the inclined bottom plate and the baffle of this level at an acute angle; the upper end of the inclined bottom plate is higher than the horizontal plane where the upper axis is located, and the upper end of the baffle is close to the horizontal plane where the upper axis is located.

6. The step tunnel type extractor according to claim 1, characterized in that: A new solution spray pipe is provided on the upper front side of the box body, and the new solution is sprayed on the middle section of the inclined bottom plate of the first-stage immersion tank; the liquid level of the previous-stage immersion tank is higher than that of the next-stage immersion tank, and a concentrated solution outlet is provided on the rear wall of the final-stage immersion tank, and a baffle plate extending under the liquid surface is provided on the front side of the concentrated solution outlet, and a concentrated mixing sedimentation zone is formed between the baffle plate and the rear wall of the final-stage immersion tank.

7. The step tunnel type extractor according to claim 2, characterized in that: A solid material feed port is provided at the rear of the top wall of the box body, and the solid material feed port is located above the final baffle; a semi-fluid material feed port is provided in front of the solid material feed port, and a feed platform is provided below the semi-fluid material feed port, and the feed platform is located above the final upper shaft.

8. The step-tunnel type extractor according to claim 7, characterized in that: The first-stage upper shaft is higher than the upper shafts of each level, and a discharge side guide rail supported under the conveying chain is provided below the rear side of the first-stage upper shaft; the feed side guide rail is located in front of the solid material feed port and above the rear side of the last-stage upper shaft.

9. The step-tunnel type extractor according to claim 1, characterized in that: A certain upper shaft is used as the main drive shaft, which is driven by a reducer; the remaining part or all of the upper shafts are used as auxiliary drive shafts, which are synchronously driven by the main drive shaft; The auxiliary drive sprocket is installed on the shaft end of the auxiliary drive shaft through a expansion sleeve.

10. The step tunnel type extractor according to claim 2, characterized in that: A feed regulating gate is provided at the upper rear of the last-stage baffle, and the feed regulating gate includes a worm gear driver, a handwheel is installed at the driving end of the worm shaft of the worm gear driver, a transmission shaft is fixed at the center of the worm wheel of the worm gear driver, the middle section of the transmission shaft is sealed and supported at the center of the gate flange sealing plate through a transmission shaft bearing seat, a transmission sleeve is fixed at the inner end of the transmission shaft, an active swing plate is fixedly connected to the outer periphery of the transmission sleeve, the free end of the active swing plate is fixedly connected to one end of the arc gate plate, the other end of the arc gate plate is fixedly connected to a driven swing plate, the fixed end of the driven swing plate is fixedly connected to a driven shaft, and the driven shaft is supported in the driven end bearing seat and is coaxial with the transmission shaft.

11. The step tunnel type extractor according to claim 10, characterized in that: A stop arm is fixedly connected to the housing of the worm gear drive, and the stop arm is fixedly connected to the transmission shaft bearing seat support ear on the outer wall of the transmission shaft bearing seat by bolts. The middle part of the transmission shaft bearing seat is welded in the center hole of the gate flange sealing plate, and the inner end surface of the gate flange sealing plate is provided with a sealing plate positioning boss, and the radius of the sealing plate positioning boss is larger than the rotation radius of the arc gate plate.

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