Ultra-large type horizontal scraper discharging and dewatering centrifugal machine

Abstract

The invention relates to the technical field of centrifugal machines, in particular to an ultra-large horizontal scraper discharging and dewatering centrifugal machine which comprises a cabin body, cabin doors arranged on the two sides of the cabin body, a parallel shaft gear differential mechanism, a screen basket arranged in the cabin body and a spiral pushing scraper. A small opening of the sieve basket faces the cabin door; the parallel shaft gear differential mechanism comprises an input shaft and an output shaft which are arranged in parallel as well as a driving gear and a rotating gear which are meshed with each other, and the output shaft comprises a scraper output shaft and a sieve basket output hollow shaft which sleeves the scraper output shaft; the scraper output shaft is connected with the spiral pushing scraper through a blade frame, and the screen basket output hollow shaft is connected with the screen basket through a screen basket rotor base frame; the driving gear is fixedly assembled on the input shaft and comprises a scraper driving gear and a sieve basket driving gear; and the rotating gear comprises a scraper rotating gear fixedly assembled on the scraper output shaft and a sieve basket rotating gear fixedly assembled on the sieve basket output hollow shaft. The centrifugal machine is large in torque, capable of being assembled with a large screen basket and large in handling capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal separation equipment, in particular to an ultra-large horizontal scraper unloading dehydration centrifuge, which is particularly suitable for dehydrating fine particle materials in industries such as coal, mining, and chemical industry. Background Art

[0002] Solid-liquid separation is a crucial step in coal washing and numerous other industrial production processes. Centrifuges, crucial for achieving efficient solid-liquid separation, have a direct impact on production efficiency and product quality. Currently, two types of coal slime dewatering centrifuges are commonly used in the domestic market: vertical scraper centrifuges and horizontal scraper centrifuges. Vertical scraper centrifuges are widely used in coal preparation plants and other fields due to their relatively simple structure. However, this type of equipment suffers from low dewatering efficiency and low throughput during actual operation, making it difficult to meet the demands of large-scale production.

[0003] As a continuously operating scraper discharge centrifuge, the horizontal scraper centrifuge has the advantages of high degree of automation and larger processing capacity than the vertical scraper centrifuge. However, with the continuous development of the coal washing industry, the demand for coal continues to grow, and environmental protection requirements are becoming increasingly stringent. Coal preparation plants are gradually transforming to large-scale. However, due to the constraints of the differential transmission system (the maximum output torque of the traditional planetary cycloid differential is insufficient to meet the torque requirements of a larger screen basket diameter, thereby limiting the processing capacity of the centrifuge), the maximum screen basket diameter of domestically produced large centrifuges is Due to the lack of corresponding large-scale dehydration centrifuges, faced with the challenge of increasing production, the coal preparation plant has to rely on multiple small centrifuges to increase production capacity. Summary of the Invention

[0004] The invention provides an ultra-large horizontal scraper unloading dehydration centrifuge to solve the technical problem of small processing capacity of the existing horizontal scraper centrifuge.

[0005] To solve the above problems, the present invention provides an ultra-large horizontal scraper unloading dehydration centrifuge, which adopts the following technical solutions:

[0006] An ultra-large horizontal scraper unloading dewatering centrifuge comprises a cabin, doors arranged on both sides of the cabin, a differential transmission system, a screen basket arranged in the cabin, and a spiral pusher scraper; the small opening of the screen basket faces the door and is the screen basket inlet end; the differential transmission system is a parallel shaft gear differential, comprising:

[0007] Input shaft;

[0008] An output shaft is arranged parallel to the input shaft and extends into the cabin. The output shaft includes a scraper output shaft and a screen basket output hollow shaft sleeved on the scraper output shaft. The scraper output shaft is connected to the spiral push scraper through a blade holder, and the screen basket output hollow shaft is connected to the screen basket through a screen basket rotor base.

[0009] A driving gear, fixedly assembled on the input shaft, including a scraper driving gear and a screen basket driving gear;

[0010] The rotating gear is meshed with the driving gear and is fixedly assembled on the output shaft; the rotating gear includes a scraper rotating gear and a screen basket rotating gear, the screen basket rotating gear is fixedly assembled on the screen basket output hollow shaft, and the scraper rotating gear is fixedly assembled on the scraper output shaft.

[0011] By adopting a parallel-axis gear differential drive system, the centrifuge basket diameter has been significantly increased (breaking the domestic centrifuge basket diameter limit and filling the gap in the domestic ultra-large horizontal scraper-discharging dewatering centrifuge). This expands the effective processing area of ​​the basket, improves solid-liquid separation efficiency and centrifuge throughput, and meets the high-capacity requirements of large coal preparation plants. Compared to traditional planetary cycloid differentials, the parallel-axis gear differential has a higher torque output capacity and can better adapt to the complex forces generated by the basket and spiral pusher during operation, reducing the failure rate of the differential drive system and extending the equipment's service life.

[0012] Currently used horizontal scraper centrifuges typically utilize a cylindrical screen basket and a cylindrical spiral pusher scraper in a table-like configuration, with the large opening of the screen basket facing the hatch and the small opening fixed to the rotating output shaft. As a consumable part of the centrifuge, the screen basket requires frequent replacement. When the cylindrical screen basket is damaged and needs to be replaced, the cylindrical spiral pusher scraper must be removed first, significantly extending repair time and impacting production efficiency. This centrifuge's configuration, with the small opening of the screen basket facing the hatch, allows for quick and convenient basket replacement by opening the hatch and unscrewing the basket's fixing bolts. This configuration facilitates equipment inspection and maintenance, improving ease of operation.

[0013] As a preferred technical solution of the present invention, the diameter of the screen basket is ≤1800mm. Compared with the maximum diameter of the traditional domestic centrifuge screen basket, In order to overcome the limitation of the centrifuge, the diameter of the screen basket is expanded to 1800mm, which significantly increases the effective separation area of ​​the screen basket, thereby greatly improving the processing capacity and dehydration efficiency of the centrifuge.

[0014] As a more preferred technical solution of the present invention, the diameter of the sieve basket is 1750 mm.

[0015] As a preferred embodiment of the present invention, the spiral pusher scraper is a spiral blade with a helix angle of 10°-75°. The helix angle, defined as the angle between the tangent of the helix and the axis of rotation, is a key parameter in centrifuge design. By adjusting the helix angle, the number of scraper blades can be adjusted accordingly, allowing the centrifuge to flexibly adapt to various production environments and achieve an optimal balance between discharge efficiency and dehydration performance. When processing fine-grained, viscous materials such as fine coal slime, the helix angle can be appropriately reduced to approximately 13-15 degrees to extend the material's residence time in the screen basket, thereby enhancing dehydration. At the same time, the number of blades can be appropriately increased to compensate for the reduction in processing capacity caused by a slower discharge rate. When processing easily dehydratable materials such as fine coal or small lumps, the helix angle can be appropriately increased, up to a maximum of 75 degrees, to accelerate discharge and improve the equipment's processing capacity. Furthermore, the number of blades should be adjusted according to actual conditions to prevent the centrifuge from overloading.

[0016] As a preferred technical solution of the present invention, the inner wall of the screen basket is provided with a tungsten carbide alloy coating. Tungsten carbide alloy has extremely high hardness and excellent wear resistance, and can effectively resist the friction and wear of coal slime, impurities, etc. on the inner wall of the screen basket, greatly extending the service life of the screen basket, and reducing the frequency of equipment maintenance and replacement costs. The high wear resistance and structural density of the coating can prevent the imbalance of the screen basket caused by wear during high-speed rotation, thereby improving the stability and safety of equipment operation, and reducing vibration and failure rate. Providing a tungsten carbide alloy coating on the inner wall of the screen basket does not affect the dehydration of the material, and can increase the service life of the screen basket (the service life of the screen basket can be increased by 2-3 times), and the use effect is very ideal; it solves the technical problem of the short service life of the existing screen basket.

[0017] As a preferred technical solution of the present invention, a sleeve is provided at the end of the scraper output shaft, and the blade holder is connected to the sleeve. The position of the sleeve is adjusted to move the spiral push scraper axially, thereby adjusting the gap between the spiral push scraper and the screen basket. The sleeve and the scraper output shaft are fixed by bolt adjustment. In the old centrifuge, the gap between the screen basket and the scraper needs to be adjusted by disassembling the scraper and then axially adding or removing gaskets, which is very troublesome. However, the centrifuge uses the method of adjusting the bolt to move the spiral push scraper axially. After the adjustment is in place, the bolt is locked to complete the gap adjustment between the screen basket and the spiral push scraper. The gap between the screen basket and the spiral push scraper can be adjusted without disassembling the spiral push scraper, which is simple and quick.

[0018] As a preferred technical solution of the present invention, the hatch is hingedly connected to the cabin body and has a feed port fixedly connected to a feed pipe for conveying the slurry to be dewatered. The hinged hatch facilitates daily inspection, maintenance, and cleaning of the equipment, improving the convenience and efficiency of equipment operation.

[0019] As a preferred technical solution of the present invention, a spiral chamber is provided at the lower part of the feed pipe, and a spiral pusher is provided in the spiral chamber to feed the slurry to be dehydrated into the inner cavity of the screen basket. The spiral pusher is provided with coaxial spiral blades and is fixedly connected to the blade holder. On the one hand, the spiral pusher pushes the material between the screen basket and the spiral pusher scraper by rotating in the spiral chamber. In this way, the material changes from the original self-flow to mechanical pushing, completely eliminating the risk of clogging; it solves the problem that the feed pipe of the traditional scraper unloading centrifuge is a direct feeding design. The feed pipe converts the vertical material into a horizontal direction and feeds it between the screen basket and the scraper. The material flows by gravity. When the incoming material has a high concentration, high viscosity, or uneven incoming material, or the instantaneous amount is large, it is easy to clog the feed pipe and cause a shutdown accident. On the other hand, the spiral pusher can pre-accelerate the slurry to be dehydrated transported by the feed pipe, so that the slurry can quickly adapt to the centrifugal field when entering the inner cavity of the screen basket, avoiding local accumulation caused by too low initial speed. At the same time, the continuous pushing action of the spiral blades makes the slurry evenly distributed along the axis of the screen basket, fully utilizing the filtration area of ​​the screen basket, reducing the problem of "too thick filter cake caused by local overload", increasing the dehydration processing capacity per unit time, and improving the liquid phase permeability rate.

[0020] Because the spiral pusher is fixedly connected to the blade holder, the pushing and scraper unloading actions are synchronized, enhancing the coordination and consistency of the entire dehydration and unloading process, which helps improve the overall operating efficiency of the equipment. When the blade holder drives the spiral scraper to scrape the filter cake, the spiral pusher simultaneously pushes new slurry to replenish the inner cavity of the screen basket, avoiding problems such as "the screen basket idling due to delayed slurry replenishment after scraping" or "slurry overflow due to excessive feeding." This synergy keeps the screen basket in a continuously efficient working state, improves the cycle stability of filter cake formation and scraping, and effectively reduces equipment vibration caused by slurry fluctuations.

[0021] At the same time, the spiral blades have a buffering and decelerating effect on the material, reducing the wear of the material on the screen basket, and solving the technical problem of the existing centrifuge material directly contacting and scouring the screen basket, resulting in serious wear at the feed end of the screen basket.

[0022] As a preferred technical solution of the present invention, multiple shock-absorbing blocks are provided below the cabin. The provision of multiple shock-absorbing blocks below the cabin can effectively absorb vibrations generated during equipment operation due to high-speed rotation or uneven material conveying, significantly reducing the overall vibration amplitude of the equipment and improving operational stability. It can also reduce fatigue damage to equipment structural components and connecting parts caused by vibration, reducing mechanical wear and tear, thereby effectively extending the service life of the equipment. At the same time, the shock-absorbing blocks cushion vibrations during equipment operation, helping to reduce mechanical noise, providing operators with a quieter and more comfortable working environment and improving the environmental performance of the equipment.

[0023] As a preferred technical solution of the present invention, the tooth difference between the scraper drive gear and the screen basket drive gear is ≤4.

[0024] The beneficial effects are:

[0025] 1. The present invention has the advantages of compact structure, large processing capacity and easy maintenance.

[0026] 2. By adopting a parallel shaft gear differential with higher output torque, it can effectively drive a larger diameter screen basket and its load, ensuring stable differential operation between the screen basket and the spiral push scraper, thereby effectively cleaning the screen gap, improving the dehydration effect, and ensuring smooth unloading and stable operation.

[0027] 3. The screen basket is inverted (i.e. the small opening of the screen basket faces the hatch), so after opening the hatch, the screen basket can be replaced by unscrewing the screen basket fixing bolts. The screen basket can be replaced conveniently and quickly, which greatly saves maintenance time and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a structural diagram of the spiral push scraper.

[0030] Description of reference numerals:

[0031] 1. Hose; 2. Feed pipe; 3. Auger; 4. Hatch door; 5. Shock absorber; 6. Screen basket; 7. Auger scraper; 8. Water tank body; 9. Screen basket rotor base; 10. Dehydrated material tank body; 11. Scraper output shaft; 12. Screen basket output hollow shaft; 13. Scraper rotating gear; 14. Screen basket rotating gear; 15. Drive pulley; 16. Input shaft; 17. Scraper drive gear; 18. Screen basket drive gear; 19. Bushing; 20. Blade holder. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0033] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0034] The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0035] Most existing horizontal scraper centrifuges suffer from high vibration and unstable operation. Due to their poor rigidity and low critical speed, vibration is particularly pronounced when the machine is operating under load. This vibration problem is particularly severe when the screen basket diameter is large (greater than 1200mm), significantly affecting the normal operation and service life of the equipment. The limited screen basket diameter limits processing capacity, making it difficult to meet the growing demands of industrial production.

[0036] In view of the common shortcomings of horizontal scraper centrifuges currently used in the domestic market, such as poor dehydration effect, small processing capacity, large vibration and unstable operation, our company has developed an ultra-large horizontal scraper unloading dehydration centrifuge. The machine has many advantages, such as high operating speed, stable operation, high dehydration efficiency, large processing capacity, small machine size, simple structure, easy installation, and easy maintenance and replacement of screen baskets.

[0037] like Figure 1 The illustrated ultra-large horizontal scraper-discharging dewatering centrifuge includes a horizontal cabin, a cabin door 4, a parallel-axis gear differential, a screen basket 6, and a spiral pusher scraper 7. The cabin door 4 and the parallel-axis gear differential are located on either side of the cabin. The spiral pusher scraper 7 and screen basket 6 are located inside the cabin and connected to the parallel-axis gear differential. The screen basket 6 is mounted on the exterior of the spiral pusher scraper 7. The parallel-axis gear differential drives the spiral pusher scraper 7 and screen basket 6 to rotate in the same direction while maintaining an appropriate speed difference. This achieves different speeds for the screen basket 6 and the spiral pusher scraper 7, allowing the spiral pusher scraper 7 to clean the screen gaps of the screen basket 6 while also promptly pushing the dewatered material out of the screen basket 6 through the spiral pusher scraper 7. Furthermore, the differential motion of the screen basket 6 and the spiral pusher scraper 7 creates a relative shear force, preventing clogging of the screen gaps.

[0038] A plurality of shock-absorbing blocks 5 are provided under the cabin. The shock-absorbing blocks 5 absorb vibrations and isolate instantaneous impacts through their own elastic deformation, thereby preventing vibrations from damaging the relative position accuracy of the core components of the centrifuge, reducing the cyclic stress of the cabin, improving the service life of the equipment, and reducing the frequency of maintenance. The cabin includes a dehydrated material cabin 10 and a water cabin 8. A discharge port is provided at the lower end of the dehydrated material cabin 10, and a drainage port is provided at the lower end of the water cabin 8. The dehydrated material cabin 10 is located at the large mouth end of the screen basket 6, and the dehydrated solid phase material is pushed to the discharge port by the spiral push scraper 7 for continuous discharge. The water cabin 8 is used to collect the liquid phase that passes through the screen basket 6 and discharge it through the drainage port provided at the bottom of the water cabin 8.

[0039] In this embodiment, the hatch 4 is hingedly connected to the cabin. A feed port is provided on the hatch 4, to which a feed pipe 2 is fixedly connected, and the feed pipe 2 is used to transport the slurry to be dehydrated. The other end of the feed pipe 2 away from the hatch 4 is connected to a rubber hose 1. A spiral chamber is provided at the lower part of the feed pipe 2, and a spiral pusher 3 is provided in the spiral chamber. The spiral pusher 3 is used to accelerate the slurry to be dehydrated and evenly feed it into the inner cavity of the screen basket 6 (i.e., between the screen basket 6 and the spiral pusher scraper 7). The spiral pusher 3 is provided with a coaxial spiral blade, and the spiral blade is affixed with high-aluminum ceramics, which is extremely strong and wear-resistant. The spiral blade has a buffering and deceleration effect on the material, thereby reducing the wear of the material on the screen basket 6. The spiral pusher 3 is fixedly connected to the blade holder 20. In other embodiments, the spiral blade can also be a high-aluminum ceramic spiral blade.

[0040] The parallel axis gear differential includes a drive assembly, an input shaft 16, an output shaft, a drive gear, and a rotating gear. The output shaft is arranged parallel to the input shaft 16, the drive gear is fixedly mounted on the input shaft 16, and the rotating gear is fixedly mounted on the output shaft. The rotating gear and the drive gear mesh with each other. A drive pulley 15 is fixedly mounted on the input shaft 16. The drive assembly drives the drive pulley 15 to rotate through a belt transmission, thereby driving the input shaft 16 to rotate. When the input shaft 16 rotates, the drive gear rotates synchronously with it, and through gear meshing, it drives the rotating gear and the output shaft to rotate, realizing the transmission of power from the input shaft 16 to the output shaft. The drive assembly adopts a flexible connection method of "motor + belt drive". The belt can buffer the vibration transmission between the input shaft 16 and the motor. When the equipment is overloaded, the belt and the drive pulley 15 can slip, forming a primary overload protection, avoiding damage to the tooth surface of the gear pair due to instantaneous impact.

[0041] The output shaft extends into the cabin and includes a scraper output shaft 11 and a hollow screen basket output shaft 12 sleeved on the scraper output shaft 11. The scraper output shaft 11 is connected to the spiral push scraper 7 via a blade holder 20, and the hollow screen basket output shaft 12 is connected to the screen basket 6 via the screen basket rotor base 9. In this embodiment, a sleeve 19 is provided at the end of the scraper output shaft 11. The blade holder 20 and sleeve 19 are fixed together by bolts. Adjusting the position of sleeve 19 by bolts allows the spiral push scraper 7 to be moved axially, thereby adjusting the gap between the spiral push scraper 7 and the screen basket 6.

[0042] The drive gears include a scraper drive gear 17 and a screen basket drive gear 18. The difference in the number of teeth between these two gears is N (N≤4), creating a fixed speed difference. In this example, the tooth difference between the two gears on the input shaft 16 (i.e., the scraper drive gear 17 and the screen basket drive gear 18) is 1. Of course, in other embodiments, the tooth difference between the two gears on the input shaft 16 can also be 2, 3, or 4.

[0043] The rotating gears include a scraper rotating gear 13 and a screen basket rotating gear 14. The screen basket rotating gear 14 is fixedly assembled on the screen basket output hollow shaft 12 to drive the screen basket 6 to rotate; the scraper rotating gear 13 is fixedly assembled on the scraper output shaft 11 to drive the spiral push scraper 7 to rotate.

[0044] The parallel axis gear differential input shaft is equipped with a scraper drive gear 17 and a screen basket drive gear 18. Both are helical gears with the same pitch circle diameter and a tooth difference of 1. Correspondingly, the scraper output shaft 11 and the screen basket output hollow shaft 12 at the output end are respectively equipped with helical gears, namely the scraper rotating gear 13 and the screen basket rotating gear 14. The two output gears are also designed with a tooth difference with the same pitch circle diameter, and are respectively engaged with the scraper drive gear 17 and the screen basket drive gear 18 on the input shaft.

[0045] The power transmission path is: the drive component drives the drive pulley on the input shaft through the motor pulley and the V-belt, and then drives the input shaft to rotate. The scraper drive gear 17 and the screen basket drive gear 18 on the input shaft rotate synchronously with the shaft, and respectively engage with the output gears on the scraper output shaft 11 and the screen basket output hollow shaft 12, and finally drive the spiral push scraper 7 and the screen basket 6 to achieve the same direction and different speed rotation - because there is a tooth difference in the gear pair, the two form a stable speed difference (the speed difference is precisely controlled by the tooth difference and transmission ratio).

[0046] This structure utilizes a large-diameter gear design (large pitch diameter and increased tooth width). The helical gear meshing enhances transmission stability and load-bearing capacity. Combined with a precision transmission design with a single tooth difference, it offers the advantages of high torque output and high-efficiency transmission. The large gears accommodate ultra-large designs and can support the installation of large-diameter screen baskets, significantly increasing material throughput and meeting the continuous operation requirements of large-scale industrial solid-liquid separation.

[0047] The screen basket 6 and the spiral push scraper 7 are arranged in a table-shaped cylindrical structure.

[0048] The small opening of the screen basket 6 faces the hatch 4 as the screen basket inlet, and the large opening faces inward as the discharge end. The large opening is fixed to the screen basket output hollow shaft 12 of the parallel axis gear differential. The screen basket 6 and the spiral push scraper 7 are both vulnerable parts that wear rapidly during use and require frequent replacement. No matter which component needs to be replaced, it can be replaced simply by opening the hatch 4, which is convenient and quick.

[0049] The screen basket 6 is made of high-strength stainless steel mesh with a slit width of 0.1mm-0.4mm. The slit width can be selected based on the feed concentration. For feed concentrations greater than 30%, the slit width can be 0.15mm; for feed concentrations greater than 50%, the slit width can be 0.35mm. Alternatively, the slit width can decrease along the direction of material movement (e.g., from 0.3mm to 0.15mm). The slit basket 6 is driven by the hollow output shaft 12 to rotate at high speed, generating centrifugal force that forces moisture to drain through the slits.

[0050] In this embodiment, the diameter of the screen basket 6 is 1750 mm, and the inner wall of the screen basket 6 is provided with a tungsten carbide alloy coating.

[0051] The spiral push scraper 7 is mounted inside the screen basket 6 and connected to the scraper output shaft 11. Its spiral blades are made of hard alloy wear-resistant coating and are used to push the dehydrated material to the discharge port. In this embodiment, the spiral angle of the spiral blade is 30°. The spiral angle is the angle formed by the tangent of the spiral line and the rotation axis (such as Figure 2 Of course, in other examples, the helix angle may also be any angle within the range of 10°-75°, such as 15°, 25°, 45°, or 60°.

[0052] Working principle:

[0053] The slurry enters through the feed pipe 2, is pre-accelerated by the spiral ejector, and then evenly enters the centrifuge basket 6; the huge centrifugal force generated by the high-speed rotation of the screen basket 6 causes the moisture of the material to pass through the material layer and the screen gap of the screen basket 6 and be discharged into the water tank body 8, and then discharged from the water tank body 8 through the drain port; the dehydrated material (i.e., solid phase material) forms a mud cake layer attached to the inner wall of the screen basket 6. Under the action of the spiral push scraper 7, the mud cake layer is continuously scraped off and pushed to the large end of the screen basket 6 until it falls into the dehydrated material cabin body 10, and then discharged at the discharge port.

[0054] There is a speed difference between the spiral push scraper 7 and the screen basket 6 to produce relative motion, which prevents material from adhering and evenly wears the screen.

[0055] The following table is a parameter comparison table of this embodiment and a conventional horizontal scraper discharge centrifuge with a screen basket diameter of 1200 mm, specifically as follows:

[0056]

[0057] As can be seen from the table above, the centrifuge of this embodiment features a large processing capacity, high dehydration efficiency, and low power consumption per unit. A conventional centrifuge with a diameter of 1.2 meters, driven by a 90kW motor, has a maximum processing capacity of 60 tons / hour and processes materials with a moisture content of 15%-18%. This centrifuge, however, uses a 110kW drive motor, has a maximum processing capacity of 120 tons / hour, maintains a moisture content of 12% or lower, and achieves lower power consumption per unit of processing capacity.

[0058] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "upper", "lower", "inside", "outside", "big", "small" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0059] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. An ultra-large horizontal scraper unloading dehydration centrifuge, comprising a cabin, doors and a differential transmission system arranged on both sides of the cabin, a screen basket arranged in the cabin, and a spiral push scraper; characterized in that: The small opening of the screen basket faces the hatch, which is the feeding end of the screen basket; the differential transmission system is a parallel axis gear differential, including: Input shaft; An output shaft is arranged parallel to the input shaft and extends into the cabin. The output shaft includes a scraper output shaft and a screen basket output hollow shaft sleeved on the scraper output shaft. The scraper output shaft is connected to the spiral push scraper through a blade holder, and the screen basket output hollow shaft is connected to the screen basket through a screen basket rotor base. A driving gear, fixedly assembled on the input shaft, including a scraper driving gear and a screen basket driving gear; The rotating gear is meshed with the driving gear and is fixedly assembled on the output shaft; the rotating gear includes a scraper rotating gear and a screen basket rotating gear, the screen basket rotating gear is fixedly assembled on the screen basket output hollow shaft, and the scraper rotating gear is fixedly assembled on the scraper output shaft.

2. The super-large horizontal scraper unloading dewatering centrifuge according to claim 1, characterized in that: The diameter of the sieve basket is ≤1800mm.

3. The super-large horizontal scraper discharge dewatering centrifuge according to claim 2, characterized in that: The diameter of the sieve basket is 1750 mm.

4. The super-large horizontal scraper discharge dewatering centrifuge according to any one of claims 1 to 3, characterized in that: The spiral push scraper is a spiral blade, and the spiral angle of the spiral blade is 10°-75°.

5. The super-large horizontal scraper discharge dewatering centrifuge according to claim 4, characterized in that: The inner wall of the screen basket is provided with a tungsten carbide alloy coating.

6. The super-large horizontal scraper unloading dewatering centrifuge according to claim 5, characterized in that: A shaft sleeve is provided at the end of the scraper output shaft, and the blade holder is connected to the shaft sleeve. The position of the shaft sleeve is adjusted to move the spiral push scraper axially, thereby adjusting the gap between the spiral push scraper and the screen basket.

7. The super-large horizontal scraper discharge dewatering centrifuge according to claim 6, characterized in that: The hatch is hinged to the cabin body, and a feed port is provided on the hatch. A feed pipe is fixedly connected to the feed port to transport the slurry to be dehydrated.

8. The super-large horizontal scraper discharge dewatering centrifuge according to claim 7, characterized in that: A spiral chamber is provided at the lower portion of the feed pipe, a spiral pusher is provided in the spiral chamber, a coaxial spiral blade is provided on the spiral pusher, and the spiral pusher is fixedly connected to the blade holder.

9. The super-large horizontal scraper discharge dewatering centrifuge according to claim 8, characterized in that: A plurality of shock-absorbing blocks are arranged below the cabin.

10. The super-large horizontal scraper unloading dewatering centrifuge according to claim 9, characterized in that: The tooth difference between the scraper driving gear and the screen basket driving gear is ≤4.

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