Discharger for RDF fuel

Abstract

The present invention discloses a discharger for RDF fuel. Inlet and outlet ports are respectively arranged at the upper and lower ends of a shell body. The inner wall of the shell body is divided into a discharge section and a return section through the inlet and outlet ports. The discharge section includes a diameter-increasing section and a main discharge section. A scraper is arranged at the upper end of the diameter-increasing section. The blades of the fan wheel include a near-core hard sheet and a far-core shrapnel. The fan wheel drives the far-core shrapnel to pass through the return section, the feed port, the scraper and the main discharge section in sequence. The far-core shrapnel normally abuts against the return section, and the scraper scrapes off the fuel strips naturally hung by the far-core shrapnel, so as to effectively avoid the blockage of the discharger and maintain the long-term safe and stable operation of the equipment. The far-core shrapnel normally abuts against or elastically abuts against the main discharge section and the return section, strictly seals and locks the wind and prevents backfire. RDF biomass fuel and solid waste can substantially replace part of coal in the cement industry.

Description

Technical Field

[0001] The invention relates to an air-locking feeding device for biomass fuel solid waste, in particular to a discharger for RDF fuel. Background Art

[0002] RDF stands for Refuse Derived Fuel, which is a harmless solid fuel made by sorting waste plastics, waste paper, waste wood, textiles, humus residues, etc. from domestic waste, and then crushing and sorting them. (The description of RDF by SSI Crushing System Engineering Company in the United States) The calorific value of RDF is 14595~20016kJ / kg, which is much higher than coal (about 10870kJ / kg), while the average calorific value of domestic waste in general cities in my country is about 4000kJ / kg.

[0003] Mr. Gao Min from the Technical Center of Chengdu Building Materials Industry Design Institute Co., Ltd. wrote in the article "Technology of Co-treatment of Urban and Rural Domestic Waste in Cement Kilns": "(1) After pretreatment, urban and rural domestic waste is sorted into three parts: primary RDF, humus residue, and inorganic heavy matter...; (2) The organic combustibles obtained by air separation are further crushed in multiple stages to make primary RDF. No additives (lime powder, coal powder, etc.) are added during the preparation process, and no traditional necessary processes such as drying and molding are required, which simplifies the disposal method."

[0004] In 2020, the amount of domestic waste generated in my country is about 310 million tons. According to the calculation that the calorific value of waste-derived combustibles after pretreatment of one ton of domestic waste is 300 kilograms of standard coal, my country's domestic waste can replace 90 million tons of standard coal after combustion. RDF has great development potential. In the future, RDF industry and standards need to be established, especially the waste pretreatment industry.

[0005] The air-locking discharger includes a shell and a fan wheel accommodated in the shell. The upper end and the lower end of the shell are respectively provided with a feed port and a discharge port. The multiple blades of the fan wheel divide the chamber of the shell into multiple cells. The cells rotate with the fan wheel, receive the RDF fuel falling into the feed port, and then push the stored RDF fuel to the discharge port during rotation.

[0006] Compared with pulverized coal and other materials, RDF fuel is a lightweight, flexible, and large-particle material. (1) RDF fuel is lightweight and cannot be discharged using the traditional unpowered flap valve that relies on gravity and counterweights to lock the air. (2) Due to the large particle size of RDF fuel, it is entangled with each other and has poor fluidity. Pile-up or entanglement can cause equipment to become blocked or jammed. For example, when using a traditional rotary air-locking discharger, the fuel strips are stuck between the fan blades and the shell, causing the discharger to become stuck. When the gap between the fan blades and the shell is too large, the air-locking effect cannot be achieved. (3) In the alternative fuel dosing process, the kiln system is in a high negative pressure state, the pressure difference between the inside and outside of the discharger is large, and cold air is strictly prevented from entering the kiln system to avoid heat consumption of the kiln system. Therefore, it is difficult to discharge materials continuously and stably while having a good air-locking function. For this reason, a air-locking discharger with stable feeding and anti-jamming properties has been specially developed. Summary of the invention

[0007] The present invention aims to solve at least one of the above-mentioned technical problems and provides a discharger for RDF fuel. The fuel at the distal end of the blade is cleared, the jamming of the material is eliminated, the blade substantially seals the inner wall of the shell, the discharger locks the wind and prevents backfire, and operates safely and stably for a long time.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A discharger for RDF fuel, comprising a shell, a scraper and a fan wheel, wherein a feed port and a discharge port are respectively arranged at the upper end and the lower end of the shell, and the inner wall of the shell is divided into a discharge section and a return section through the feed port and the discharge port, and the discharge section comprises a diameter-increasing section and a main discharge section transitionally connected to the lower end of the diameter-increasing section, and the scraper is arranged at the upper end of the diameter-increasing section, and the fan wheel comprises a core shaft rotatably connected to the shell and at least four fan blades uniformly distributed on the peripheral wall of the core shaft along the circumferential direction, and the fan blades comprise a near-core hard sheet and a far-core shrapnel, and the at least four fan blades are suitable for dividing the bore of the shell into at least four cells, and the fan wheel is suitable for driving the far-core shrapnel to pass through the return section, the feed port, the scraper and the main discharge section in sequence, and the far-core shrapnel can abut against the hard sheet in the core shaft under normal conditions. The return section, the increased diameter section and the distal core spring sheet have a predetermined interval, the scraper is suitable for scraping off the fuel strips hung by the distal core spring sheet, so that the fuel strips lag behind the distal core spring sheet, and the distal core spring sheet is suitable for abutting against the main unloading section under normal conditions, or is suitable for elastically abutting against the main unloading section due to fuel tipping and squeezing; wherein the scraper is transmission-connected with a lifting power mechanism, and the lifting power mechanism is suitable for driving the scraper to lift and lower, so that the fuel strips on the scraper fall off through the shell stopper; when 0-80% of the cells pass through the scraper, the scraper is in a downward protruding state, when 80-90% of the cells pass through the scraper, the scraper is in an upward recovery state, and when 90-100% of the cells pass through the scraper, the scraper is in a downward protruding state.

[0010] Compared with the prior art, the beneficial effects of the present application include: the shell adopts variable diameter technology, and in the increased diameter section of the shell, the distal core spring piece maintains a certain gap with the shell, and the fuel falling on the distal core spring piece is in a natural accumulation state. When the distal core spring piece passes through the scraper, the naturally accumulated material is dragged by the rake nails into the cavity of the next unit cell to prevent the unloader from being stuck by the fuel; compared with the traditional unloader, the hidden dangers of affecting continuous production caused by the jamming of materials are eliminated, and the equipment can be kept safe and stable for a long time; when the distal core spring piece runs to the main unloading section and the return section, the distal core spring piece normally abuts against or elastically abuts against the shell to achieve strict sealing and wind locking, eliminating the problem of lax wind locking of traditional fan blades; the present invention solves the problem of continuous and stable operation of wind locking and material prevention during the transportation and addition of lightweight, poorly fluid and large-particle fuels.

[0011] As an improvement of the above technical solution, the distal spring piece is normally in a bent state, and the fold tip or arc top of the distal spring piece normally points to the rotation direction of the impeller, and the distal spring piece is suitable for pressing against the unloading main section due to fuel tipping and squeezing.

[0012] As an improvement of the above technical solution, the thickness of the near-core hard sheet gradually decreases radially outward, and a crushing ridge is arranged on the front side and / or the rear side of the near-core hard sheet. The crushing ridge is a triangular ridge. A plurality of the crushing ridges are arranged side by side along the axial direction of the impeller, and the crushing ridges are suitable for smashing, crushing and sliding cutting of RDF fuel.

[0013] As an improvement of the above technical solution, a stepped through hole is provided on the top of the shell, and the scraper rake can be inserted into the stepped through hole from the outside to the inside so that the rake nails of the scraper rake protrude from the increased diameter section. The stepped through hole is detachably packaged with a cover plate to fix the scraper rake.

[0014] As an improvement of the above technical solution, the shell is provided with a cam for lifting the scraper rake, the cam chain drives or gear drives the fan wheel, the fan wheel is provided with n fan blades, and the cam rotates n times when the fan wheel rotates one circle.

[0015] As an improvement of the above technical solution, the shell includes a shell body and an end cover, and both ends of the core shaft are provided with stepped shafts suitable for installing rolling bearings. One end of the core shaft is installed on the inner side of the shell body through a corresponding rolling bearing, and the rolling bearing at the other end of the core shaft is installed on the inner side of the end cover. The end cover is screwed to the shell body to jointly clamp the core shaft.

[0016] As an improvement of the above technical solution, flanges are provided at both ends of the core shaft to isolate the cavity of the shell from the rolling bearing.

[0017] As an improvement of the above technical solution, a first pulse nozzle facing upward is provided at one end of the discharge port close to the return section, and at least one end wall of the shell is provided with a second pulse nozzle located above the discharge port, below the core shaft, and upwardly deviated from the discharge port, and the first pulse nozzle and the second pulse nozzle are connected to a high-pressure gas source through corresponding solenoid valves respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic structural diagram of a discharger for RDF fuel according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram showing the structure of a discharger for RDF fuel with the end cover hidden;

[0021] Figure 3 for Figure 1 A front angled cross-sectional view showing a discharger for RDF fuel;

[0022] Figure 4 for Figure 3 A partial structural schematic diagram of a discharger for RDF fuel is shown;

[0023] Figure 5 for Figure 3 A partial structural working schematic diagram of a discharger for RDF fuel is shown;

[0024] Figure 6 for Figure 3 showing a side angled cutaway view of a discharger for RDF fuel;

[0025] Figure 7 for Figure 6 Shown is an exploded view of a discharger for RDF fuel.

[0026] The accompanying drawings are only one specific embodiment of the present invention, and the form and structure of this specific embodiment should not limit the expansion of other embodiments.

[0027] Shell 100, shell body 110, feed port 111, discharge section 112, diameter increasing section 112a, discharge main section 112b, discharge port 113, return section 114, end cover 120, cell 130, cover plate 140;

[0028] Scraping rake 200;

[0029] The fan wheel 300, the core shaft 310, the flange 311, the fan blade 320, the near-core hard plate 321, the scrap ridge 321a, the far-core spring piece 322, the rolling bearing 330, and the felt sealing ring 340;

[0030] Fuel strip 400. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Reference Figures 1 to 7 The present invention provides a discharger for RDF fuel, comprising a shell 100, a scraper 200 and a fan wheel 300, wherein the upper end and the lower end of the shell 100 are respectively provided with a feed port 111 and a discharge port 113, the inner wall of the shell 100 is divided into a discharge section 112 and a return section 114 through the feed port 111 and the discharge port 113, the discharge section 112 comprises a diameter increasing section 112a and a discharge main section 112b transitionally connected to the lower end of the diameter increasing section 112a, the scraper 200 is arranged at the upper end of the diameter increasing section 112a, the fan wheel 300 comprises a core shaft 310 rotatably connected to the shell 100 and at least four fan blades 320 uniformly distributed on the peripheral wall of the core shaft 310 along the circumferential direction, the fan blades 320 comprise a near-core hard sheet 32 1 and a distal core spring piece 322, the at least four fan blades 320 are suitable for dividing the chamber of the shell 100 into at least four cells 130, the fan wheel 300 is suitable for driving the distal core spring piece 322 to pass through the return section 114, the feed port 111, the scraper 200 and the unloading main section 112b in sequence, the distal core spring piece 322 can abut against the return section 114 under normal conditions, the diameter increase section 112a and the distal core spring piece 322 have a predetermined interval, the scraper 200 is suitable for scraping off the fuel strip 400 hung by the distal core spring piece 322, so that the fuel strip 400 lags behind the distal core spring piece 322, and the distal core spring piece 322 is suitable for abutting against the unloading main section 112b under normal conditions, or is suitable for elastically abutting against the unloading main section 112b due to fuel tipping and extrusion.

[0033] The core shaft 310 of the impeller 300 is suitable for transmission connection with the discharge motor, which is an electric motor, a pneumatic motor, or a hydraulic motor, and the discharge motor is suitable for driving the impeller 300 to roll. The core shaft 310 of the impeller 300 and the housing 100 are generally made of steel, and the near-core hard sheet 321 is connected to the core shaft 310 by screws, or is integrally formed with the core shaft 310 by welding, casting, etc., that is, the near-core hard sheet 321 is generally also made of steel. The distal spring piece 322 is connected to the proximal hard piece 321 by screws, adhesion, etc. The distal spring piece 322 is suitable for deformation and is suitable for locking wind and preventing backfire. The distal spring piece 322 can be made of clay refractory plastic, high aluminum refractory plastic, mullite refractory plastic, corundum refractory plastic, chrome refractory plastic, silicon carbide refractory plastic, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polysulfone (PSU, PPSU, etc.), or polytetrafluoroethylene (PTFE), etc. The normal state of the distal spring piece 322 is the state in which the distal spring piece 322 is almost not deformed (that is, it is discussed according to the actual possible deformation of 3%, not ideal).

[0034] Reference Figures 1 to 3 , Figures 5 to 7 The feed port 111 and the discharge port 113 are respectively arranged at the upper end and the lower end of the housing 100, so it can be understood that one of the discharge section 112 and the return section 114 is suitably the left section of the inner wall of the housing 100, and the other is suitably the right section of the inner wall of the housing 100. The feed port 111 is suitable for docking with the drop port of equipment such as a silo, a material pipe or a funnel.

[0035] Reference Figure 2 , Figure 3 and Figure 5 The diameter-increasing section 112 a belongs to the upper section of the unloading section 112 . At this time, the distal core spring piece 322 is not easily deformed, so there is a predetermined gap between the diameter-increasing section 112 a and the normal distal core spring piece 322 .

[0036] Reference Figure 2 , Figure 3 and Figure 5 The impeller 300 is a rolling part, and its multiple blades 320 are suitable for dividing the cavity of the shell 100 into multiple cells 130, so it can be understood that the diameter-increasing section 112a, the main unloading section 112b and the return section 114 are all horizontal cylindrical surfaces.

[0037] Because there is a predetermined gap between the diameter increasing section 112a and the remote core spring piece 322, the remote core spring piece 322 normally abuts against the discharge main section 112b or deforms against the discharge main section 112b, and the remote core spring piece 322 normally abuts against the return section 114, so the diameter of the cylindrical surface corresponding to the diameter increasing section 112a>the diameter of the cylindrical surface corresponding to the discharge main section 112b≥the diameter of the cylindrical surface corresponding to the return section 114. Figure 3, the unloading section 112 is the left section of the inner wall of the shell 100, and the return section 114 is the right section of the inner wall of the shell 100; Figure 2 The junction of the return section 114, the diameter increasing section 112a and the main unloading section 112b is directly shown. Figure 3 The dashed line shown is a reference for comparing the sizes of the return section 114, the diameter-increasing section 112a and the main unloading section 112b.

[0038] Reference Figure 2 , Figure 6 and Figure 7 The scraper rake 200 is in a rake shape or a comb shape; the scraper rake 200 includes a base strip, and a plurality of rake nails / rake teeth / rake fingers arranged at intervals on the base strip.

[0039] Taking the return section 114 as a reference, the blade 320 of the impeller 300 has a rotation radius r, and the impeller 300 is provided with n blades 320, n ≥ 4, so the distance between the free ends of two adjacent blades 320 is about 2πr / n; the length of the fuel strip 400 is 4-12 cm, so (2πr / n) ≥ 12, that is, r ≥ (6n / π). Further, n is preferably ≥ 5, so r ≥ (6×5 / π), that is, r ≥ 9.6 cm. Preferably, r ≥ 12 cm.

[0040] In actual cement rotary kiln calcination, a large amount of coal powder and RDF fuel needs to be placed in the rotary kiln, and the discharger needs to have a certain size (r≥20cm). The discharger fully meets the requirement that the fuel strips 400 can be scraped off, and the discharger is even relatively wide.

[0041] The operation of the present invention is as follows: A. Figure 2 , Figure 3 The impeller 300 is provided with five impeller blades 320, and the five impeller blades 320 divide the cavity of the housing 100 into five cells 130 (a cavity between two adjacent impeller blades 320 is a cell 130), and the impeller 300 rotates counterclockwise, see the W direction in the figure;

[0042] B. Taking one of the cells 130 as an example, when the position of the cell 130 corresponds to the return section 114, the distal spring pieces 322 of the blades 320 at both ends of the cell 130 are in a normal state, and the distal spring pieces 322 abut against the return section 114 to achieve sealing on the right side of the housing 100;

[0043] C. When the position of the cell 130 corresponds to the feed port 111, the feed port 111 drops RDF fuel into the cell 130. Figure 5 The distal end of the front blade 320 of the unit cell 130 may be hung with a fuel strip 400 (the fan wheel 300 is a rotating part / movable part. According to the rotation direction of the fan wheel 300, the two blades 320 of the unit cell 130 are described as the front blade 320 and the rear blade 320);

[0044] D. Reference Figure 5 When the front blade 320 of the cell 130 passes through the scraper 200, the middle part of the fuel strip 400 on the blade 320 is scraped by the scraper 200, and the lagging section of the fuel strip 400 is still suspended in the air or buried in the fuel of the cell 130. The leading section of the fuel strip 400 gradually lags behind the front blade 320 due to the scraping of the scraper 200, so that the fuel strip 400 completely falls into the cell 130 (that is, completely lags behind the front blade 320), and the fuel strip 400 is separated from the blade 320, avoiding the fan wheel 300 and the housing 100 from being blocked;

[0045] E. Reference Figure 5 After the cell 130 passes the scraper 200, it continues to rotate with the impeller 300, and the distal spring piece 322 normally abuts against the discharge main section 112b to achieve the sealing of the left side of the shell 100, or the fuel in the cell 130 gradually overturns, causing the distal spring piece 322 of the front impeller 320 of the cell 130 to gradually deform, and the distal spring piece 322 elastically presses against the discharge section 112 to achieve the sealing of the left side of the shell 100.

[0046] F. Reference Figure 2 , Figure 3 When the position of the cell 130 corresponds to the discharge port 113, the RDF fuel in the cell 130 is discharged through the discharge port 113;

[0047] G. When the unit cell 130 is located at a position corresponding to the return segment 114, the distal spring pieces 322 of the blades 320 at both ends of the unit cell 130 are in a normal state... (reciprocating cycle).

[0048] When each blade 320 passes through the scraper 200, the fuel in the cell 130 in front of it is overturned, and the fuel at the front end of the blade 320 is relatively loose, and there is even no fuel to bury the fuel strip 400, so it is relatively easy to scrape off the fuel strip 400. In addition, when each blade 320 passes through the scraper 200, the cell 130 behind it has just been filled with fuel, and the fuel at the front end of the blade 320 is relatively loose, and there is even no fuel to bury the fuel strip 400. After being scraped off, the fuel strip 400 falls into the cell 130 behind it due to its own weight and is even buried by the fuel.

[0049] Reference Figure 2 , Figure 3The impeller 300 is provided with at least four blades 320, and corresponding at least four cells 130 are formed in the shell 100, so the feed port 111, the discharge section 112, the discharge port 113 and the return section 114 correspond to at least one cell 130 respectively; the discharge section 112 and the return section 114 are respectively normally abutted / elastically abutted by at least one blade 320, so that the shell 100 is sealed to prevent wind and fire from flowing upward from the discharge port 113 (to prevent backflow and backfire, that is, lock the wind).

[0050] The unloader is essentially a wind lock valve, which is suitable for releasing fuel from top to bottom, so it is called a "unloader".

[0051] Alternative fuels are mostly lightweight materials, and the silo is prone to poor material discharge. By increasing the width of the discharge port and designing one side of the discharge cone bucket into a plumb surface, the vertical support force of the material is reduced, which can ensure continuous and uniform material discharge. In the present invention, the width of the discharger can be increased, and the size of the discharge port of the discharger can be increased.

[0052] Compared with the prior art, the beneficial effects of the present application include: the shell 100 adopts the variable diameter technology, and in the increased diameter section of the shell 100, the distal core spring piece 322 maintains a certain gap with the shell 100, and the fuel falling on the distal core spring piece 322 is in a natural accumulation state. When the distal core spring piece 322 passes through the scraper 200, the naturally accumulated material is dragged by the rake nails into the cavity of the next unit cell to prevent the unloader from being stuck by the fuel; compared with the traditional unloader, the hidden danger of affecting continuous production caused by the jamming of the material is eliminated, and the equipment can be kept safe and stable for a long time; when the distal core spring piece 322 runs to the main unloading section and the return section, the distal core spring piece 322 normally abuts against or elastically abuts against the shell to achieve strict sealing and wind locking, eliminating the problem of lax wind locking of traditional fan blades; the present invention solves the problem of continuous and stable operation of wind locking and anti-jamming during the transportation and addition of lightweight, poorly fluid and large-particle fuels.

[0053] Preferably, the remote core spring piece 322 is a removable and replaceable elastic wear-resistant plate, so that the remote core spring piece 322 and the housing 100 are flexibly and tightly fitted to avoid air leakage caused by the gap between the fan blades and the housing 100. The scraper 200 and the remote core spring piece 322 are made into standard parts and can be directly disassembled and replaced after consumption and wear.

[0054] Furthermore, a viewing window is provided on the column wall or end wall of the housing 100 , through which the blockage of the discharger and the wear of the scraper 200 and the remote core spring piece 322 can be checked.

[0055] Reference Figure 2 , Figure 3 and Figure 5In some embodiments of the present invention, the distal core spring piece 322 is normally in a bent state, and the fold tip or arc top of the distal core spring piece 322 normally points to the rotation direction of the impeller 300, and the distal core spring piece 322 is suitable for being pressed against the unloading main section 112b due to the tipping and squeezing of the fuel. The distal core spring piece 322 is firmly against the unloading main section 112b, so that the sealing and wind-locking state of the unloading main section 112b is stable; in addition, the distal section / end of the distal core spring piece 322 does not extend along the radial direction of the fan blade 320, but forms a guide surface. Under the scraping of the scraper 200, the fuel strip 400 is guided along the distal section of the distal core spring piece 322, and the fuel strip 400 is easy to remove.

[0056] Reference Figure 5 After the fuel caught by the distal spring piece 322 is removed, the fuel in the cell 130 is overturned, and the fuel in the cell 130 is separated from the distal spring piece 322 of the fan blade 320 behind it. The fan blade 320 can easily sweep the fuel, and the fan blade 320 and the housing 100 are not easily blocked. Figures 2 to 7 Preferably, the rake nails of the scraper rake 200 are provided with scraper hooks, so that the scraper rake 200 can scrape the fuel strips 400 more effectively.

[0057] Refer to the figure Figure 2 , Figure 3 and Figure 5 The thickness of the hard sheet 321 near the core gradually decreases radially outward, and the hard sheet 321 near the core is connected to the core shaft 310 of the impeller 300 with a thick root, so that the impeller 300 has a relatively high strength.

[0058] Refer to the figure Figure 2 , a material ridge 321a is provided on the front side and / or the rear side of the near-core hard sheet 321 (the impeller 300 is a rotating part / movable part, and the front side and rear side of the near-core hard sheet 321 are recorded according to the rotation direction of the impeller 300), and the material ridge 321a is a triangular ridged knife, and the material ridge 321a is suitable for smashing and crushing hard particles of RDF fuel. Preferably, a plurality of material ridges 321a are arranged side by side along the axial direction of the impeller 300, that is, the triangular ridged knife extends almost along the radial direction of the impeller, which further strengthens the strength of the fan blades, so that the fan blades can forcefully remove materials and impact RDF fuel, and is suitable for sliding fuel from top to bottom, which is convenient for sliding waste plastics, paper scraps, waste wood chips, waste cloth scraps, and woven bags, which are common components of RDF fuel. The material ridge 321a is preferably made of hard steel such as manganese steel.

[0059] Reference Figures 3 to 5 In some embodiments, a stepped through hole is provided on the top of the shell 100, and the scraper rake 200 can be inserted into the stepped through hole from the outside to the inside, so that the rake nails of the scraper rake 200 protrude from the increased diameter section 112a. The stepped through hole is detachably packaged with a cover plate 140 to fix the scraper rake 200.

[0060] After being used for a certain period of time, fuel strips 400 may be caught between the rake nails of the scraper rake 200. In order to reduce the disassembly, cleaning and maintenance of the scraper rake 200 and improve the scraping work quality of the scraper rake 200, preferably, the scraper rake 200 is connected to a lifting power mechanism, which is suitable for driving the scraper rake 200 to rise and fall, so that the fuel strips 400 on the scraper rake 200 fall off after being stopped by the shell 100.

[0061] In some designs, the lifting power mechanism is directly a power element, such as a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder.

[0062] In some embodiments of the present invention, when 0-80% of the cells 130 pass through the scraper 200, the scraper 200 is in a downward convex state, when 80-90% of the cells 130 pass through the scraper 200, the scraper 200 is in an upward retracted state, and when 90-100% of the cells 130 pass through the scraper 200, the scraper 200 is in a downward convex state.

[0063] In some designs, the above-mentioned action sequence of the scraper 200 and the impeller 300 is realized by the intelligent central controller; that is, the lifting power mechanism and the unloading motor are electrically connected to the central controller, which can be a PLC, a single-chip microcomputer, an ECU, a personal PC, etc. Figure 2 , Figure 3 and or Figure 5 In one rotation of the fan wheel 300, the rake nails rise and fall five times, and when 80-90% of the cells 130 pass through the scraper rake 200, the scraper rake 200 is in an upward retracting state, and the scraper rake 200 is in a downward protruding state during other periods.

[0064] Preferably, the housing 100 is provided with a cam for lifting the scraper rake 200. The cam rotates one circle to realize the above-mentioned timing, that is, 0-80% is the downward protruding state of the scraper rake 200, 80-90% is the upward retracting state of the scraper rake 200, and 90-100% is the downward protruding state of the scraper rake 200. The cam chain drives or gears drive the fan wheel 300, and the fan wheel 300 is provided with n blades 320. When the fan wheel 300 rotates one circle, the cam rotates n circles. In the unloader, a single power can synchronously solve the rotation of the fan wheel 300 and the lifting and lowering of the scraper rake 200; and the action timing of the fan wheel 300 and the scraper rake 200 does not need to be designed with complicated programming, reducing the high-cost central control intelligent control.

[0065] Reference Figure 1 , Figure 2 , Figure 6 and Figure 7In some embodiments of the present invention, the housing 100 includes a housing body 110 and an end cover 120, and stepped shafts suitable for mounting rolling bearings 330 are provided at both ends of the mandrel 310. One end of the mandrel 310 is mounted on the inner side of the housing body 110 through the corresponding rolling bearing 330, and the rolling bearing 330 at the other end of the mandrel 310 is mounted on the inner side of the end cover 120. The end cover 120 is screwed to the housing body 110 to clamp the mandrel 310 together. In the present invention, the rolling bearing 330 is installed internally, and no excessive screws / nuts are required. Only the end cover 120 and the housing body 110 need to be screwed. The impeller 300 and its rolling bearing 330 are easy to disassemble and assemble, the near-core hard sheet 321 is easy to clean, and the far-core shrapnel 322 is easy to clean and replace.

[0066] Reference Figure 6 and Figure 7 In some embodiments of the present invention, flanges 311 are provided at both ends of the core shaft 310 to isolate the cavity of the housing 100 from the rolling bearing 330, thereby preventing the rolling bearing 330 from getting stuck in fuel. The rolling bearing 330 has a longer service life, the impeller 300 works smoothly instead of shaking, and the sealing effect between the fan blades 320 and the housing 100 is guaranteed.

[0067] Reference Figure 6 and Figure 7 In some embodiments of the present invention, the flange 311 is connected to the housing 100 via a felt seal ring 340 . The felt seal ring 340 has a better isolation effect and has a smaller impact on the rolling of the impeller 300 .

[0068] Reference Figure 2 , Figure 3 In some embodiments of the present invention, the central vertical section of the feed port 111 deviates from the central vertical section of the mandrel 310 in the form of a direction away from the rotation direction of the impeller 300, so that the scraper 200 is located at about -10 degrees from the inner wall of the shell 100, and the diameter increase section 112a starts at about -10 degrees from the inner wall of the shell 100. When the discharger is large and n=5, such as r≥25cm, the diameter increase section 112a starts at about -20 degrees from the inner wall of the shell 100.

[0069] Reference Figure 2 , Figure 3 and Figure 5 In some embodiments of the present invention, the distal core spring piece 322 is connected to the front side of the rotation direction of the proximal core hard piece 321, and the proximal core hard piece 321 drives the distal core spring piece 322 in a push-pull manner. The screw connection, adhesion, etc. between the distal core spring piece 322 and the proximal core hard piece 321 are subjected to little force, and the distal core spring piece 322 is firmly connected to the proximal core hard piece 321.

[0070] RDF is a loose material and may remain at the root of the cell 130, and even part of the RDF fuel may remain at the rear blade 320 of the cell 130 due to moisture. In some embodiments of the present invention, a first pulse nozzle facing upward is provided at one end of the discharge port 113 close to the return section 114, and at least one end wall of the housing 100 is provided with a second pulse nozzle located above the discharge port 113, below the core shaft 310, and upwardly deviated from the discharge port 113. The first pulse nozzle and the second pulse nozzle are connected to a high-pressure gas source, such as a 0.7-1.5Mpa compressed gas tank / compressor, through corresponding solenoid valves. When 0-5% of the cell 130 passes through the first pulse nozzle, the first pulse nozzle sprays for 0.4-1 seconds, and when 6-20% of the cell 130 passes through the first pulse nozzle, the second pulse nozzle sprays for 0.4-1 seconds. The cell 130 is allowed to fully discharge the RDF fuel therein, and the inner wall of the cell 130 is kept clean and empty, so as to facilitate the subsequent full acceptance of the RDF fuel and facilitate subsequent rapid discharge. The second pulse nozzle is located above the discharge port 113, below the core shaft 310, and deviates upward from the discharge port 113, that is, the second nozzle is located at the upper end of the cell 130, which is suitable for both breaking up the RDF fuel that may remain at the root of the cell 130 and for aerating the RDF fuel in the cell 130, so as to facilitate the rapid discharge of the RDF fuel from the cell 130.

[0071] It can be understood that the pulse nozzle is actually a gas nozzle. Figure 2 , Figure 3 When the cell 130 passes through the left end of the discharge port 113, that is, when the cell 130 passes through the first pulse nozzle, the pulse nozzle sprays once, and the spray time is short, presenting a pulse state. The high-pressure gas source is sprayed through the pulse nozzle, and the high-speed airflow scatters the RDF fuel.

[0072] Preferably, both end walls of the shell 100 are provided with second pulse nozzles, and when 6-10% of the cells 130 pass through the first pulse nozzle, one of the second pulse nozzles sprays for 0.4-1 seconds, and when 11-15% of the cells 130 pass through the first pulse nozzle, another second pulse nozzle sprays for 0.4-1 seconds.

[0073] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A discharger for RDF fuel, characterized in that: include: The shell has a feed port and a discharge port at its upper and lower ends respectively, and the inner wall of the shell is divided into a discharge section and a return section through the feed port and the discharge port, and the discharge section includes a diameter-increasing section and a main discharge section transitionally connected to the lower end of the diameter-increasing section. A scraper is arranged at the upper end of the diameter increasing section. A fan wheel, comprising a core shaft rotatably connected to the shell and at least four fan blades uniformly distributed on the peripheral wall of the core shaft along the circumferential direction, the fan blades comprising a near-core hard sheet and a far-core spring sheet, the at least four fan blades are suitable for dividing the chamber of the shell into at least four cells, the fan wheel is suitable for driving the far-core spring sheet to pass through the return section, the feed port, the scraper and the main unloading section in sequence, the far-core spring sheet can abut against the return section under normal conditions, the diameter increase section and the far-core spring sheet have a predetermined interval, the scraper is suitable for scraping off the fuel sheet strips hung by the far-core spring sheet, so that the fuel sheet strips lag behind the far-core spring sheet, the far-core spring sheet is suitable for abutting against the main unloading section under normal conditions, or is suitable for elastically abutting against the main unloading section due to fuel tipping and extrusion; Wherein, the scraper rake transmission is connected to a lifting power mechanism, and the lifting power mechanism is suitable for driving the scraper rake to rise and fall, so that the fuel strips on the scraper rake fall off after passing through the shell stopper; when 0-80% of the cells pass through the scraper rake, the scraper rake is in a downward protruding state, when 80-90% of the cells pass through the scraper rake, the scraper rake is in an upward recovery state, and when 90-100% of the cells pass through the scraper rake, the scraper rake is in a downward protruding state.

2. The discharger for RDF fuel according to claim 1, characterized in that The distal spring piece is normally in a bent state, and the fold tip or arc top of the distal spring piece normally points to the rotation direction of the impeller. The distal spring piece is suitable for being pressed against the main discharge section due to the tipping and squeezing of the fuel.

3. The discharger for RDF fuel according to claim 1, characterized in that The thickness of the near-core hard sheet gradually decreases radially outward, and a crushing ridge is arranged on the front side and / or the rear side of the near-core hard sheet. The crushing ridge is a triangular ridge. A plurality of the crushing ridges are arranged side by side along the axial direction of the impeller, and the crushing ridges are suitable for smashing, crushing and sliding cutting of RDF fuel.

4. The discharger for RDF fuel according to claim 1, characterized in that A stepped through hole is provided on the top of the shell, and the scraper rake can be inserted into the stepped through hole from outside to inside so that the rake nails of the scraper rake protrude from the increased diameter section. The stepped through hole is detachably packaged with a cover plate to fix the scraper rake.

5. The discharger for RDF fuel according to claim 1, characterized in that The housing is provided with a cam for lifting the scraper rake, the cam chain drives or gear drives the fan wheel, the fan wheel is provided with n fan blades, and the cam rotates n times when the fan wheel rotates one circle.

6. The discharger for RDF fuel according to any one of claims 1 to 5, characterized in that: The shell includes a shell body and an end cover. Both ends of the core shaft are provided with stepped shafts suitable for installing rolling bearings. One end of the core shaft is installed on the inner side of the shell body through a corresponding rolling bearing. The rolling bearing at the other end of the core shaft is installed on the inner side of the end cover. The end cover is screwed to the shell body to clamp the core shaft together.

7. The discharger for RDF fuel according to claim 6, characterized in that Both ends of the core shaft are provided with flanges to isolate the cavity of the housing from the rolling bearing.

8. A discharger for RDF fuel according to any one of claims 1 to 5, characterized in that: A first pulse nozzle facing upward is arranged at one end of the discharge port close to the return section, and a second pulse nozzle located above the discharge port, below the core shaft, and upwardly deviated from the discharge port is arranged on at least one end wall of the shell, and the first pulse nozzle and the second pulse nozzle are connected to a high-pressure gas source through corresponding solenoid valves respectively.

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