A sugarcane husk sieving device

Abstract

This invention discloses a sugarcane husk screening device, relating to the field of sugarcane husk screening technology. The device includes: a rake-tooth conveyor, a sugarcane husk collection hopper, a pneumatic conveying device, and a filtration system collection device. The rake-tooth conveyor has a first conveying section and a second conveying section; a first screen plate is formed on the bottom plate of the second conveying section; the sugarcane husk collection hopper cooperates with the first screen plate, and several centrifugal fans are installed outside the sugarcane husk collection hopper. Sugarcane bagasse from the pretreatment workshop falls into the bottom plate of the first conveying section and is lifted along the second conveying section to the boiler front conveyor. When the bagasse passes through the second conveying section, the sugarcane husk in the bagasse, under its own gravity and the suction of the centrifugal fans, falls through the screen holes of the first screen plate into the sugarcane husk collection hopper, and is then conveyed to the next stage of the filtration system collection device by the pneumatic conveying device. This invention simplifies conventional sugarcane husk screening devices, reduces equipment costs, and improves system stability.

Description

Technical Field

[0001] This invention relates to the field of sugarcane husk sieving technology, and in particular to a sugarcane husk sieving device. Background Technology

[0002] Sugarcane bran consists of fine, short fibers from bagasse, typically no more than 4.75 mm in diameter. In the filtration section of sugarcane sugar mills, sugarcane bran is mixed with the slurry discharged from the bottom of the settling tank and used in a filterless vacuum filter. The sugarcane bran acts as a filter aid. Therefore, theoretically, the smaller the diameter of the sugarcane bran, the larger its specific surface area, the better the filter aid effect, and the lower the sugar content in the filtered slurry, meaning less sucrose loss.

[0003] Bagasse is composed of a mixture of long and short fibers, with a moisture content of up to 50%. It is extremely prone to clogging during screening, therefore the screening of bagasse bran differs from that of particulate matter. Currently, the most commonly used screening device is the bagasse bran drum screen.

[0004] Traditional sugarcane bagasse extraction equipment is complex, typically including: a bagasse conveyor, a bagasse unloader, a drum bagasse screening machine, and a bagasse return system. The bagasse is lifted from pretreatment to a boiler conveyor by the bagasse conveyor, which is equipped with a bagasse unloader. The unloader guides a portion of the bagasse into the drum bagasse screening machine for screening. The screened bagasse is then transported to the filtration section, while the remaining bagasse is lifted back to the original bagasse conveyor by the lifting system.

[0005] The bagasse flow rate entering the bagasse conveyor is unstable. If the bagasse unloader is not adjusted in time, a large amount of bagasse will enter the drum bagasse screening machine at the same time, which can easily cause the drum bagasse screening machine to overload and stop. After the machine stops, the bagasse needs to be manually cleaned from the drum bagasse screening machine, which will affect the stable operation of the sugar mill's filtration section system. Summary of the Invention

[0006] In view of the above problems, the present invention is proposed to provide a sugarcane husk screening device that overcomes or at least partially solves the above problems.

[0007] This invention provides a sugarcane chaff screening device, comprising: a rake tooth conveyor and a sugarcane chaff collection hopper disposed below it, wherein the sugarcane chaff collection hopper is connected to a pneumatic conveying device, and the pneumatic conveying device is connected to a filtration system collection device;

[0008] The rake tooth conveyor includes: an upper rake tooth, a lower rake tooth, a bottom plate and a side plate. The two sides of the bottom plate are connected to the side plate. The lower rake tooth and the upper rake tooth are connected and are located sequentially above the bottom plate. Under the drive of the drive device, the lower rake tooth moves from bottom to top as the conveying section, and the upper rake tooth moves from top to bottom as the return section.

[0009] The rake tooth conveyor has a horizontally arranged first conveying section and a second conveying section that is inclined upward to the first conveying section. The bagasse is conveyed from the first conveying section to the boiler front conveyor through the second conveying section.

[0010] A first screen plate is formed by a number of screen holes of the same diameter on the bottom plate of the second conveying section along the bagasse conveying direction.

[0011] The sugarcane chaff collection hopper is located below and cooperates with the first sieve plate, and several centrifugal fans are provided on the outside of the sugarcane chaff collection hopper.

[0012] The bagasse from the pretreatment workshop falls onto the bottom plate of the first conveyor section and is conveyed along the first and second conveyor sections to the boiler front conveyor. When the bagasse reaches the second conveyor section, the sugarcane chaff in the bagasse falls through the sieve holes of the first sieve plate into the sugarcane chaff collection hopper under the negative pressure suction of the centrifugal fan, and is then conveyed to the filtration system collection device by the pneumatic conveying device to enter the next stage. The bagasse after being screened by the second conveyor section is conveyed along the bottom plate to the boiler front conveyor.

[0013] Optionally, a second sieve plate is provided immediately below the first sieve plate to cooperate with it; a sieve plate position adjuster is provided on one side of the second sieve plate, by adjusting the position of the second sieve plate to change the relative position of the first sieve plate and the second sieve plate so that a hole is formed between the sieve holes of the first sieve plate and the second sieve plate, and the hole diameter is adjustable.

[0014] Optionally, the sieve holes of the first sieve plate and the second sieve plate are set as waist-shaped holes with a diameter of 2 mm and a length of 8 mm, and the length direction of the hole is parallel to the width direction of the first sieve plate and the second sieve plate.

[0015] Optionally, a number of support bars are arranged at intervals below the second sieve plate along the conveying direction.

[0016] Optionally, both the first sieve plate and the second sieve plate include several sieve plates, the length of each sieve plate not exceeding 1.5m and its width being consistent with the width of the bottom plate.

[0017] Optionally, the bagasse collection hopper gradually becomes shallower along the bagasse conveying direction, and a baffle valve is provided at the bottom of the bagasse collection hopper 2.

[0018] Optionally, two centrifugal fans are provided, and each fan has a manual damper at its inlet.

[0019] Optionally, the filtration system collection device includes, in sequence, a cyclone separator, a star-shaped unloader, and a sugarcane husk collection and mixing tank.

[0020] Optionally, the sieve plate position adjuster includes:

[0021] A fixing clip is clamped to the end of the side of the second sieve plate and fixed to the second sieve plate by bolts;

[0022] An adjusting screw is fixedly connected to the other end of the fixing clamp, and the adjusting screw is arranged in a direction away from the second sieve plate;

[0023] A fixed frame is located above the adjusting screw, with one end connected to the side plate and the other end welded with a fixed plate that passes through the adjusting screw;

[0024] A fixing plate passes through the adjusting screw and is welded to the other end of the fixing frame;

[0025] The limiting nut passes through the adjusting screw and is located between the fixing clamp and the fixing plate, and is close to the fixing plate;

[0026] The handwheel is located at the end of the adjusting screw;

[0027] A fixing nut is located on the adjusting screw between the fixing plate and the handwheel, and is welded to the fixing plate.

[0028] Optionally, the second conveying unit is connected to the first conveying unit to form an angle A, where 0° < A < 45°.

[0029] In this invention, bagasse from the pretreatment workshop falls directly onto the bottom plate of the first conveyor. The bagasse is then dragged by the lower rake teeth from the first conveyor to the boiler front conveyor via the second conveyor. When the bagasse reaches the second conveyor, it covers the screen holes of the first screen plate during the dragging and lifting process. The bagasse hopper, under the suction of a centrifugal fan, forms a negative pressure. The bagasse chaff in the bagasse, under the combined action of gravity and negative pressure, falls through the screen holes of the first screen plate into the bagasse chaff collection hopper and is then conveyed by a pneumatic conveying device to the filtration system collection device for the next stage. The bagasse, after being screened by the second conveyor, is then conveyed along the bottom plate to the boiler front conveyor. This invention achieves direct separation of bagasse chaff during the rake tooth conveyor process, simplifying the bagasse chaff screening device to the greatest extent possible and preventing overload shutdown of the bagasse screening machine when the bagasse flow rate is unstable, thus ensuring stable operation of the sugar mill's filtration system.

[0030] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0032] In the attached diagram:

[0033] Figure 1 This is a structural diagram of a sugarcane husk sieving device provided in an embodiment of the present invention;

[0034] Figure 2 This is a cross-sectional structural diagram of a rake tooth conveyor provided in an embodiment of the present invention;

[0035] Figure 3 This is a structural diagram of a sugarcane chaff collection hopper provided in an embodiment of the present invention;

[0036] Figure 4 This is a top view of the first sieve plate in the second conveying section provided in an embodiment of the present invention;

[0037] Figure 5 This is a cross-sectional view of the first sieve plate and the second sieve plate provided in an embodiment of the present invention;

[0038] Figure 6 This is a structural diagram of the first sieve plate provided in an embodiment of the present invention. Attached image description:

[0040] 1. Rake tooth conveyor; 11. Upper rake teeth; 12. Lower rake teeth; 13. Base plate; 14. Side plate; 15. First conveying section; 16. Second conveying section; 17. First screen plate; 171. Second screen plate; 172. Screen plate position adjuster; 172a. Fixing clamp; 172b. Adjusting screw; 171c. Fixing frame; 172d. Fixing plate; 172e. Limit nut; 172f. Handwheel; 172g. Fixing nut; 173. Support bar; 2. Sugarcane chaff collection hopper; 21. Slide valve; 22. Centrifugal fan; 221. Manual damper; 3. Pneumatic conveying device; 4. Filtration system collection device; 41. Cyclone separator; 42. Rotary rotary valve; 43. Sugarcane chaff collection mixing tank. Detailed Implementation

[0041] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0042] In this field, sugarcane bran refers to the fine, short fibers in bagasse, typically not exceeding 4.75 mm in diameter. Bagasse is a mixture of long and short fibers with a moisture content of around 50%, making it highly susceptible to clogging during screening. Therefore, screening sugarcane bran differs from screening particulate matter. Currently, the commonly used screening device is the sugarcane bran drum screen. Traditional sugarcane bran removal equipment is complex, typically including a bagasse conveyor, a bagasse unloader, a drum sugarcane bran screen, and a bagasse return system. The flow rate of bagasse entering the conveyor is unstable. If the bagasse unloader is not adjusted promptly, a large amount of bagasse can simultaneously enter the drum sugarcane bran screen, easily causing overload and shutdown. After shutdown, manual cleaning of the bagasse is required, thus affecting the stable operation of the sugar mill's filtration system.

[0043] In view of this, the present invention provides a sugarcane husk screening device, which aims to simplify the screening system, avoid overload shutdown of the sugarcane husk screening machine when the sugarcane bagasse conveying flow is unstable, and ensure stable operation of the sugar mill filtration section system.

[0044] The application of this invention is as follows.

[0045] Figure 1 As shown, the present invention provides a sugarcane chaff screening device, the device comprising: a rake tooth conveyor 1 and a sugarcane chaff collection hopper 2 disposed below it, the sugarcane chaff collection hopper 2 being connected to a pneumatic conveying device 3, the pneumatic conveying device 3 being connected to a filtration system collection device 4;

[0046] Figure 2 As shown, the rake tooth conveyor 1 includes: an upper rake tooth 11, a lower rake tooth 12, a bottom plate 13, and a side plate 14. The two sides of the bottom plate 13 are connected to the side plate 14. The lower rake tooth 12 and the upper rake tooth 11 are connected and are located above the bottom plate 13 in sequence. Under the drive of the driving device, the lower rake tooth 12 moves from bottom to top as the conveying section, and the upper rake tooth 11 moves from top to bottom as the return section.

[0047] Figure 1 As shown, the rake tooth conveyor 1 has a horizontally arranged first conveying section 15 and a second conveying section 16 that is inclined upward to the first conveying section 15; bagasse is conveyed from the first conveying section 15 to the boiler front conveyor via the second conveying section 16.

[0048] Figure 1 and Figure 6 As shown, a first screen plate 17 is formed by a plurality of screen holes with the same aperture on the bottom plate 13 of the second conveying section 16 along the bagasse conveying direction.

[0049] Figure 1As shown, the sugarcane chaff collection hopper 2 is located below and cooperates with the first sieve plate 17, and several centrifugal fans 22 are provided on the outside of the sugarcane chaff collection hopper 2;

[0050] The bagasse from the pretreatment workshop falls into the bottom plate 13 of the first conveyor section 15 and is conveyed to the boiler front conveyor along the first conveyor section 15 and the second conveyor section 16. When the bagasse is conveyed to the second conveyor section 16, the sugarcane chaff in the bagasse falls into the sugarcane chaff collection hopper 2 through the sieve holes of the first sieve plate 17 under the negative pressure suction of the centrifugal fan 22, and is then conveyed to the filtration system collection device 4 through the pneumatic conveying device 3 to enter the next stage. The bagasse after being screened by the second conveyor section 16 is conveyed to the boiler front conveyor along the bottom plate 13.

[0051] In this embodiment of the invention, bagasse from the pretreatment workshop falls directly onto the bottom plate 13 of the first conveyor section 15. The bagasse is then dragged by the lower rake teeth 12 from the first conveyor section 15 through the second conveyor section 16 to the boiler front conveyor. When the bagasse reaches the second conveyor section 16, it covers the sieve holes of the first screen plate 17 during the dragging and lifting process. The bagasse chaff collection hopper 2 is then subjected to negative pressure under the suction of the centrifugal fan 22. Under the combined action of gravity and negative pressure, the bagasse chaff in the bagasse falls through the sieve holes of the first screen plate 17 into the bagasse chaff collection hopper 2, and is then conveyed by the pneumatic conveying device 3 to the filtration system collection device 4 for the next stage. The bagasse, after being screened by the second conveyor section 16, is conveyed along the bottom plate 13 to the boiler front conveyor. The bottom plate 13 is made of ordinary steel plate. In this invention, bagasse is directly separated during the conveying process of the rake tooth conveyor 1, which simplifies the bagasse screening device to the greatest extent and avoids the bagasse screening machine from overloading and shutting down when the bagasse conveying flow is unstable, thus ensuring the stable operation of the sugar mill filtration section system.

[0052] Furthermore, Figure 4 and Figure 5 As shown, a second sieve plate 171 is provided below the first sieve plate 17 to cooperate with it; a sieve plate position adjuster 172 is provided on one side of the second sieve plate 171, by adjusting the position of the second sieve plate 171, changing the relative position of the first sieve plate 17 and the second sieve plate 171, so that the sieve holes of the first sieve plate 17 and the second sieve plate 171 are superimposed to form a hole, and the hole diameter is adjustable.

[0053] In this embodiment of the invention, a second sieve plate 171 is disposed immediately below the first sieve plate 17, and a sieve plate position adjuster 172 is disposed on one side of the second sieve plate 171. The sieve holes of the first sieve plate 17 and the second sieve plate 171 are identical. The position of the second sieve plate 171 can be adjusted by the sieve plate position adjuster 172, changing the relative position of the first sieve plate 17 and the second sieve plate 171, with a maximum adjustment range of one sieve hole. In the initial position, the sieve holes of the first sieve plate 17 and the second sieve plate 171 are completely overlapped, and the sieve hole diameter is unobstructed, having the largest diameter, while the sugarcane bran screened is relatively coarse. When the position of the second sieve plate 171 is adjusted by the sieve plate position adjuster 172, the sieve holes of the first sieve plate 17 and the second sieve plate 171 are misaligned and overlapped, the hole diameter becomes smaller, and the size of the sugarcane bran screened becomes smaller. The first sieve plate 17 and the second sieve plate 171 are made of perforated stainless steel. The position of the second sieve plate 171 can be adjusted according to the actual needs of the size of the sugarcane chaff to ensure the quality of the sieved chaff.

[0054] Furthermore, Figure 4 and Figure 6 As shown, the sieve holes of the first sieve plate 17 and the second sieve plate 171 are set as waist-shaped holes with a diameter of 2 mm and a length of 8 mm, and the length direction of the hole is parallel to the width direction of the first sieve plate 17 and the second sieve plate 171.

[0055] In one embodiment of the present invention, the sieve holes of the first sieve plate 17 and the second sieve plate 171 are configured as oblong holes with a diameter of 2 mm and a length of 8 mm. The length direction of the hole is parallel to the width direction of the first sieve plate 17 and the second sieve plate 171. Therefore, the adjustment range of the second sieve plate 171 is 0-8 mm, and the range of adjustment of the second sieve plate 171 can be adjusted according to actual needs. The oblong hole is only one embodiment of the present invention; the sieve holes can have various shapes, such as circular, elliptical, and square. The size of the sieve holes can be set according to actual needs, and the adjustment range of the second sieve plate 171 depends on the size of the sieve holes.

[0056] Optional, Figure 5 As shown, several support bars 173 are arranged at intervals below the second screen plate 171 and along the bagasse conveying direction.

[0057] In this embodiment of the invention, a plurality of support bars 173 are arranged at intervals below the second screen plate 171 along the conveying direction. The support bars 173 mainly serve to support and fix the second screen plate 171 and the first screen plate 17 above them.

[0058] Preferably, both the first sieve plate 17 and the second sieve plate 171 include a plurality of sieve plates, the length of which does not exceed 1.5m, and the width of which is the same as the width of the bottom plate 13.

[0059] In this embodiment of the invention, the first sieve plate 17 and the second sieve plate 171 are composed of multiple sieve plates, each no longer than 1.5m and with a width equal to the width of the base plate 13. When a certain location on the sieve plate is damaged, the multiple sieve plates facilitate localized replacement; the length of each sieve plate not exceeding 1.5m prevents excessive weight-bearing and potential damage due to excessive length. This embodiment is merely one implementation of the invention; the first and second sieve plates can be configured according to actual needs.

[0060] Optional, Figure 1 and Figure 3 As shown, the sugarcane husk collection hopper 2 gradually becomes shallower along the sugarcane bagasse conveying direction, and a baffle valve 21 is provided at the bottom of the sugarcane husk collection hopper 2.

[0061] In this embodiment of the invention, the bagasse is conveyed along the direction of the second conveyor 16. The amount of sugarcane chaff in the bagasse decreases as it moves further in. Because the sugarcane chaff collection hopper 2 is inclined upwards, the sugarcane chaff slides downwards along the inclined direction. Therefore, the sugarcane chaff collection hopper 2 is designed to gradually become shallower along the bagasse conveying direction. Furthermore, because a baffle valve 21 is installed at the bottom of the sugarcane chaff collection hopper 2, it is opened to clear any blockages inside the hopper. The sugarcane chaff collection hopper is only one embodiment of the invention and can be configured according to actual conditions.

[0062] Furthermore, Figure 3 As shown, there are two centrifugal fans 22, and each of them has a manual damper 221 at its inlet.

[0063] In this embodiment of the invention, two centrifugal fans 22 are symmetrically arranged on both sides of the outer side of the sugarcane chaff collection hopper 2, one of which is a spare; at the same time, the centrifugal fans 22 and the sugarcane chaff conveying pipeline form a pneumatic conveying device 3, which helps to discharge and convey the sugarcane chaff. The amount of sugarcane chaff conveyed can be adjusted by adjusting the opening degree of the manual damper 221. Figure 3 This is merely an exemplary implementation and should not be construed as a limitation on the location of the centrifugal fan.

[0064] Optional, Figure 1 As shown, the filtration system collection device 4 includes, in sequence, a cyclone separator 41, a star-shaped unloader 42, and a sugarcane husk collection and mixing tank 43.

[0065] In this embodiment of the invention, sugarcane husks are conveyed to a cyclone separator 41 via a pneumatic conveying device 3 for air separation. The air-separated sugarcane husks are then conveyed to a star-shaped unloader 42 and then enter a sugarcane husk collection and mixing tank 43 via the star-shaped unloader 42 to mix with the mud juice.

[0066] Furthermore, Figure 5 As shown, the sieve plate position adjuster 172 includes:

[0067] A fixing clip 172a is clamped at the end of the side of the second sieve plate 171 and fixed to the second sieve plate 171 by bolts;

[0068] An adjusting screw 172b is fixedly connected to the other end of the fixing clamp 172a, and the adjusting screw 172b is arranged in a direction away from the second sieve plate 171;

[0069] A fixed frame 172c is located above the adjusting screw 172b, with one end connected to the side plate 14 and the other end welded with a fixing plate that passes through the adjusting screw 172b;

[0070] The fixing plate 172d passes through the adjusting screw 172b and is welded to the other end of the fixing frame 172c;

[0071] The limiting nut 172e passes through the adjusting screw 172b and is located between the fixing clamp 172a and the fixing plate 172d, and is close to the fixing plate 172d.

[0072] Handwheel 172f is located at the end of the adjusting screw 172b;

[0073] A fixing nut 172g is located on the adjusting screw 172b between the fixing plate 172d and the handwheel 172f, and is welded and fixed to the fixing plate 172d.

[0074] In this embodiment of the invention, the second screen plate 171 is fixedly connected to the adjusting screw 172b by the fixing clamp 172a. The adjusting screw 172b is adjusted by rotating the handwheel 172f, thereby adjusting the position of the second screen plate 171. The distance between the limiting nut 172e and the fixing plate 172d is the adjustable range of the second screen plate 171. Figure 5 The screen plate position adjuster described herein is merely an exemplary embodiment and should not be construed as a limitation on the screen plate position adjuster.

[0075] Optional, Figure 1 As shown, the second transmission unit 16 and the first transmission unit 15 are connected to form an angle A, and 0° < A < 45°.

[0076] In this embodiment of the invention, the second conveying part 16 is tilted upward at an angle not greater than 45° to avoid the tilt angle being too large, which would cause the sugarcane husk in the sugarcane husk collection hopper 2 to slide downward and block the discharge port 21 of the sugarcane husk collection hopper 2.

[0077] Working Principle: Bagasse from the pretreatment workshop falls directly onto the bottom plate 13 of the first conveyor section 15. Dragged by the lower rake teeth 12, the bagasse is conveyed from the first conveyor section 15 through the second conveyor section 16 to the boiler front conveyor. When the bagasse reaches the second conveyor section 16, during the dragging and lifting process, it covers the sieve holes of the first sieve plate. Under the action of the bagasse's own gravity and the negative pressure generated by the centrifugal fan 22 within the bagasse chaff collection hopper 2, the bagasse chaff in the bagasse falls into the bagasse chaff collection hopper 2 below through the holes formed between the sieve holes of the first sieve plate 17 and the second sieve plate 171. The size of the holes formed between the sieve holes of the first sieve plate 17 and the second sieve plate 171 can be adjusted by the sieve plate position adjuster 172. The bagasse is then conveyed by the pneumatic conveying device 3 to the filtration system collection device 4 for the next stage. The bagasse, after being screened by the second conveyor section 16, is conveyed along the bottom plate 13 to the boiler front conveyor. In this invention, bagasse is directly separated during the conveying process of the rake tooth conveyor 1, which simplifies the bagasse screening device to the greatest extent. By adjusting the size of the holes formed by the superposition of the screen holes of the first screen plate 17 and the second screen plate 171, the quality of the screened bagasse is guaranteed. Furthermore, since there is no bagasse unloader or bagasse drum screen, the fluctuation of the bagasse conveying flow on the rake tooth conveyor 1 will not affect the operation of the bagasse screening system, thus ensuring the stable operation of the sugar mill filtration section system.

[0078] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0079] The above provides a detailed description of the sugarcane husk screening device provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A sugarcane chaff screening device, characterized in that, The device includes: a rake tooth conveyor (1) and a sugarcane chaff collection hopper (2) below it, the sugarcane chaff collection hopper (2) is connected to a pneumatic conveying device (3), and the pneumatic conveying device (3) is connected to a filtration system collection device (4); The rake tooth conveyor (1) includes: an upper rake tooth (11), a lower rake tooth (12), a bottom plate (13) and a side plate (14). The two sides of the bottom plate (13) are connected to the side plate (14). The lower rake tooth (12) and the upper rake tooth (11) are connected and are located above the bottom plate (13) in sequence. Under the drive of the drive device, the lower rake tooth (12) moves from bottom to top as the conveying section, and the upper rake tooth (11) moves from top to bottom as the return section. The rake tooth conveyor (1) has a horizontally arranged first conveying section (15) and a second conveying section (16) that is inclined upward to the first conveying section (15). The bagasse is conveyed from the first conveying section (15) to the boiler front conveyor via the second conveying section (16). A first screen plate (17) is formed by a plurality of screen holes of the same diameter on the bottom plate (13) of the second conveying section (16) along the bagasse conveying direction. The sugarcane husk collection hopper (2) is located below and cooperates with the first sieve plate (17), and several centrifugal fans (22) are provided on the outside of the sugarcane husk collection hopper (2). The bagasse from the pretreatment workshop falls into the bottom plate (13) of the first conveyor section (15) and is conveyed to the boiler front conveyor along the first conveyor section (15) and the second conveyor section (16). When the bagasse is conveyed to the second conveyor section (16), the sugarcane chaff in the bagasse falls into the sugarcane chaff collection hopper (2) through the sieve holes of the first sieve plate (17) under the negative pressure suction of the centrifugal fan (22), and is conveyed to the filtration system collection device (4) through the pneumatic conveying device (3) to enter the next stage. After being screened by the second conveyor section (16), the bagasse is conveyed to the boiler front conveyor along the bottom plate (13). The sugarcane husk collection hopper (2) gradually becomes shallower along the sugarcane bagasse conveying direction, and a baffle valve (21) is provided at the bottom of the sugarcane husk collection hopper (2). Two centrifugal fans (22) are provided, and a manual damper (221) is provided at their inlet position. The filtration system collection device (4) includes, in sequence, a cyclone separator (41), a star-shaped unloader (42), and a sugarcane husk collection and mixing tank (43).

2. The sugarcane husk screening device according to claim 1, characterized in that, A second sieve plate (171) is provided below the first sieve plate (17) to cooperate with it; a sieve plate position adjuster (172) is provided on one side of the second sieve plate (171), by adjusting the position of the second sieve plate (171) to change the relative position of the first sieve plate (17) and the second sieve plate (171) so that the sieve holes of the first sieve plate (17) and the second sieve plate (171) are superimposed to form a hole, and the hole diameter is adjustable.

3. The sugarcane husk sieving device according to claim 2, characterized in that, The sieve holes of the first sieve plate (17) and the second sieve plate (171) are set as waist-shaped holes with a diameter of 2 mm and a length of 8 mm. The length direction of the hole is parallel to the width direction of the first sieve plate (17) and the second sieve plate (171).

4. The sugarcane husk sieving device according to claim 2, characterized in that, Several support bars (173) are arranged at intervals below the second screen plate (171) along the bagasse conveying direction.

5. The sugarcane husk screening device according to claim 2, characterized in that, The first sieve plate (17) and the second sieve plate (171) each include several sieve plates, the length of which does not exceed 1.5m and the width of which is the same as the width of the bottom plate (13).

6. The sugarcane husk screening device according to claim 2, characterized in that, The sieve plate position adjuster (172) includes: A fixing clip (172a) is clamped at the end of the side of the second sieve plate (171) and fixed to the second sieve plate (171) by bolts; An adjusting screw (172b) is fixedly connected to the other end of the fixing clamp (172a), and the adjusting screw (172b) is arranged in a direction away from the second sieve plate (171); A fixed frame (172c) is located above the adjusting screw (172b), with one end connected to the side plate (14) and the other end welded with a fixed plate that passes through the adjusting screw (172b); A fixing plate (172d) passes through the adjusting screw (172b) and is welded to the other end of the fixing frame (172c); The limiting nut (172e) passes through the adjusting screw (172b) and is located between the fixing clamp (172a) and the fixing plate (172d), and is close to the fixing plate (172d). The handwheel (172f) is located at the end of the adjusting screw (172b); A fixing nut (172g) is located on the adjusting screw (172b) between the fixing plate (172d) and the handwheel (172f), and is welded to the fixing plate (172d).

7. The sugarcane husk sieving device according to claim 1, characterized in that, The second transmission unit (16) is connected to the first transmission unit (15) to form an angle A, and 0° < A < 45°.

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