Sea sand waste screening machine

Abstract

The present invention discloses a sea sand waste screening machine, belonging to the field of screening equipment, which comprises a frame and a sieve cylinder inclined at a certain angle with the horizontal plane. Among them: the sieve cylinder is a cylindrical shape with an open upper end face and a closed lower end face. The upper end face of the sieve cylinder is the raw sand inlet. A spray pipe is arranged at the raw sand inlet in the sieve cylinder. The sieve cylinder is successively a screening section and a waste section along the direction of raw sand feeding from front to back. A number of finished sand screening outlets are arranged on the side wall of the screening section, and a number of waste outlets are arranged on the side wall of the waste section. The lower end face of the sieve cylinder is connected to a motor through a transmission shaft located outside the sieve cylinder. The transmission shaft is supported on the frame. A guiding slip ring is arranged at the outer periphery of the upper end face of the sieve cylinder, and the guiding slip ring cooperates with a driven supporting wheel installed on the frame. This sea sand waste screening machine has a shaftless structure inside, with high feeding efficiency, high output, low water consumption, low cost and low noise.

Description

Technical Field

[0001] The present invention relates to the field of screening equipment, and particularly to a sea sand waste screening machine. Background Art

[0002] With the development of building materials in China, the scale of building aggregate production enterprises is getting larger and larger. The modernization level of the equipment of sea sand purification machinery and equipment will directly affect the production capacity, product quality, production cost, labor productivity and energy consumption of enterprises, and thus directly affect the efficiency and development speed of enterprises. Modern sea sand purification plants are highly automated and use assembly line operations. If a fault occurs during the continuous operation of the screening equipment, it may lead to the shutdown of the entire production line. Therefore, the safe and reliable operation of the screening equipment is of great significance for ensuring the normal and efficient operation of the production line.

[0003] Sea sand often contains harmful substances such as shells, mud, mud blocks, and coarse particles that need to be screened. At present, in China, the screening of waste materials such as shells, mud, and mud blocks in river sand and sea sand purification basically uses linear vibrating screens and shaft circular screens. Linear vibrating screens and shaft circular screens are one of the main equipment for sea sand purification waste screening and particle size separation, and their performance directly affects the production efficiency, particle size quality, yield, and market rapid response ability of sea sand.

[0004] The linear vibrating screen uses the principle of exciting vibration by a vibrating motor to make the material move in a jumping straight line on the screen surface. The raw sand enters the feeding port of the screening machine from the upper end of the vibrating screen, and through multiple layers of screen meshes, several specifications of oversize and undersize materials are produced and discharged from their respective outlets respectively to achieve waste screening.

[0005] Currently, the commonly used linear vibrating screens in the market have problems such as high cost, large vibration force, high operating noise, and high requirements for infrastructure construction. During the operation of the vibrating screen, when faults such as crossbeam fracture, side plate cracking, and screen mesh breakage occur, the most direct manifestations are generally changes in amplitude, frequency, and noise. The vibrating screen generally works in a harsh environment with relatively high surrounding noise.

[0006] The shaft circular screen screens by the rotation of a drum screen. The drum is installed at an inclination angle. The middle part of the drum structure is connected to the skeleton through a main shaft, and both ends of the main shaft are installed on the bearing seats and driven to rotate by a motor. The raw sand enters from the middle of the cylinder body, and under the action of rotation and the screen mesh, the primary finished sand is thrown out and falls, and the waste is discharged from the tail. Patent examples of shaft circular screens can be found in Chinese patent documents CN211881824U, CN212189955U, CN111299120A, CN210632416U, etc.

[0007] The rotating shaft of the shafted circular sieve is located inside the cylinder, and an axial support structure may be required. When feeding materials into the cylinder, it is necessary to avoid the rotating shaft and the axial support structure. The feeding port cannot be set in the sieve cylinder, which will cause the original sand for feeding to splash outwards. Blocked by the rotating shaft and the axial support structure, water can only be sprayed from the outside of the shafted circular sieve, only rinsing the sieve mesh on the outside of the cylinder, unable to rinse the original sand inside the cylinder. The screening efficiency is low, the water consumption is large during waste screening, and the screening capacity per hour of a single unit of equipment is generally less than 60 cubic meters. Summary of the Invention

[0008] The present invention provides a sea sand waste screening machine, which has a shaftless structure inside, high feeding efficiency, high output, low water consumption, low cost, and low noise.

[0009] The technical solutions provided by the present invention are as follows:

[0010] A sea sand waste screening machine includes a frame and a sieve cylinder inclined at a certain angle to the horizontal plane, wherein:

[0011] The sieve cylinder is cylindrical with an open upper end face and a closed lower end face. The upper end face of the sieve cylinder is the original sand inlet. A spray pipe is arranged at the original sand inlet inside the sieve cylinder. The sieve cylinder is successively a screening section and a waste section along the direction of the original sand feeding from front to back. A plurality of finished sand screening outlets are arranged on the side wall of the screening section, and a plurality of waste outlets are arranged on the side wall of the waste section;

[0012] The lower end face of the sieve cylinder is connected to a motor through a transmission shaft located outside the sieve cylinder. The transmission shaft is supported on the frame. A guiding slip ring is arranged at the outer periphery of the upper end face of the sieve cylinder, and the guiding slip ring cooperates with a driven supporting wheel installed on the frame.

[0013] Further, the sieve cylinder includes a cylindrical sieve cylinder framework and a sieve mesh. The sieve mesh is installed inside the sieve cylinder framework of the screening section. The sieve holes of the sieve mesh serve as the finished sand screening outlets, and the gaps of the sieve cylinder framework in the waste section serve as the waste outlets.

[0014] Further, the sieve cylinder framework includes axially arranged outer layer support rods, a circular middle layer row frame fixedly connected to the outer layer support rods, and an axially arranged inner layer framework fixedly connected to the middle layer row frame. The sieve mesh is installed on the inner layer framework.

[0015] Further, along the direction of the original sand feeding from front to back, the aperture of the finished sand screening outlets gradually decreases.

[0016] Further, along the direction of the original sand feeding from front to back, a receiving plate, a first sieve mesh, a second sieve mesh, and a third sieve mesh are successively installed inside the sieve cylinder framework of the screening section;

[0017] The material receiving plate is not provided with sieve holes. The aperture of the sieve holes of the first sieve mesh is 5 - 8 mm, the aperture of the sieve holes of the second sieve mesh is 4 - 5 mm, and the aperture of the sieve holes of the third sieve mesh is 3 - 4 mm.

[0018] Furthermore, an annular inner baffle is arranged inside the circumference of the guiding slip ring. An annular first outer baffle is arranged at the outer circumference between the guiding slip ring and the finished sand screening outlet. An annular second outer baffle is arranged at the outer circumference between the waste outlet and the lower end surface of the sieve cylinder.

[0019] Furthermore, an axial raw sand distributing rod is arranged inside the sieve cylinder. The raw sand distributing rod is located inside the sieve mesh and is spaced 20 - 100 mm from the sieve mesh. An installation ring is arranged at the upper end surface of the sieve cylinder. The lower end surface of the sieve cylinder is closed by a sealing disc arranged at the lower end surface. One end of the raw sand distributing rod is installed on the sealing disc, and the other end passes through the installation ring and is installed and positioned.

[0020] Furthermore, a waste conveyor belt is arranged below the waste outlet. A raw sand feeding hopper is arranged inside the raw sand inlet. The spray pipe is connected to an external water supply pipe through a flange.

[0021] Furthermore, the raw sand feeding hopper and the external water supply pipe are arranged in sequence along the rotation direction of the sieve cylinder.

[0022] Furthermore, the first outer baffle and the installation ring are of an integral structure. The installation ring is connected to the upper end surface of the sieve cylinder framework. The inner baffle and the guiding slip ring are of an integral structure. The inner baffle is connected to the installation ring. The second outer baffle and the sealing disc are of an integral structure. The sealing disc is connected to the lower end surface of the sieve cylinder framework.

[0023] Furthermore, the motor is installed on the frame. The output shaft of the motor is arranged horizontally. The output shaft of the motor is connected to the transmission shaft through a universal joint coupling. The outer surface shape of the driven supporting wheel is conical.

[0024] Furthermore, the sea sand waste screening machine further includes a controller, a metering device, an electrically controlled water outlet valve, and a frequency converter. Among them, the metering device measures the weight of the incoming raw sand in real time. The controller controls the frequency converter and the electrically controlled water outlet valve according to the weight to adjust the rotation speed of the motor and the water spraying amount of the spray pipe.

[0025] The present invention has the following beneficial effects:

[0026] The present invention adopts a cylindrical sieve barrel structure with a shaftless interior and external drive, eliminating the need to avoid the rotating shaft and shaft support structure when feeding sand into the barrel. Therefore, raw sand can be directly fed into the interior from the upper end of the sieve barrel. The raw sand will not scatter into the finished sand due to obstruction, preventing waste from mixing into the finished sand. The feeding process is smooth, efficient, and results in high production. Without the obstruction of the rotating shaft and shaft support structure, the spray water pipe can be led into the interior of the barrel without affecting the rotation of the drum sieve. Water with pressure is directly sprayed onto the surface of the raw sand inside the barrel to wash the raw sand, greatly facilitating the screening of sand smaller than the sieve aperture from the finished sand screening outlet, while pushing the waste larger than the sieve aperture backward for discharge, improving the waste screening efficiency and reducing water consumption. Additionally, directly spraying water onto the surface of the raw sand inside the barrel can more thoroughly wash the raw sand, which is beneficial for flushing out the salt in sea sand. After screening and washing, the chloride content (calculated as the mass of chloride ions) in the finished sand is less than 0.02%. The lower end of the present invention is connected to the drive motor through a transmission shaft, and a driven idler is installed at the rear end, resulting in low vibration and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Combined view of multiple sea sand waste screening machines of the present invention;

[0028] Figure 2 Side view of the sea sand waste screening machine of the present invention;

[0029] Figure 3 Top view of the sea sand waste screening machine of the present invention;

[0030] Figure 4 Schematic structural view of the sieve barrel of the sea sand waste screening machine of the present invention;

[0031] Figure 5 Schematic assembly view of the sieve barrel of the sea sand waste screening machine of the present invention;

[0032] Figure 6 Schematic view of removing the raw sand distributor rod;

[0033] Figure 7 Schematic structural view of the sieve barrel skeleton;

[0034] Figure 8 Schematic view of the screen arrangement;

[0035] Figure 9 Schematic view of the integral inner baffle and guide slip ring;

[0036] Figure 10 Schematic view of the integral first outer baffle and mounting ring;

[0037] Figure 11 Schematic view of the driven idler;

[0038] Figure 12 Schematic diagram of the control principle of the sea sand waste screening machine of the present invention. Specific embodiments

[0039] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0040] An embodiment of the present invention provides a sea sand waste screening machine, as Figures 1 - 12 shown, including a frame 1 and a screen cylinder 2 inclined at a certain angle to the horizontal plane, wherein:

[0041] The screen cylinder 2 is a cylindrical shape with an open upper end surface and a closed lower end surface. The upper end surface of the screen cylinder 2 is the raw sand inlet 3. A spray pipe 4 is arranged at the raw sand inlet in the screen cylinder 2. Nozzles 5 are arranged on the spray pipe 4. The screen cylinder 2 is successively a screening section 6 and a waste section 7 along the direction of the raw sand feeding from front to back. A plurality of finished sand screening outlets 8 are arranged on the side wall of the screening section 6, and a plurality of waste outlets 9 are arranged on the side wall of the waste section 7.

[0042] The lower end surface of the screen cylinder 2 is connected to the motor 13 through a transmission shaft 10, a speed reducer 11, a pulley and a belt 12 located outside the screen cylinder. The transmission shaft 10 is supported on the frame 1. A guiding slip ring 14 is arranged at the outer periphery of the upper end surface of the screen cylinder 2, and the guiding slip ring 14 is matched with a driven idler 15 installed on the frame 1.

[0043] The present invention is widely applicable to the screening of wastes such as shells, mud, and mud blocks in sea sand purification. When in use, the motor is started, and the screen cylinder is driven to rotate through the pulley, speed reducer, and transmission shaft; the raw sand is fed from the raw sand inlet on the upper end surface, the spray pipe inside the screen cylinder is opened, and the spray flushes the surface of the raw sand to assist in feeding; the raw sand rises along the cylinder wall by friction and is thrown out from the finished sand screening outlet to form finished sand. The finished sand enters the next production line, and wastes such as shells, mud, and mud blocks are discharged from the waste outlet at the rear end of the screen cylinder.

[0044] The screen cylinder is inclinedly supported through the transmission shaft at the lower end, the guiding slip ring at the upper end, and the driven idler for inclination screening. The power of the motor is transmitted to the lower end of the screen cylinder from the outside, adopting an external drive form. The drive drives the cylinder to rotate at a speed of 9 - 18 revolutions per minute. The guiding slip ring at the upper end is used for force transmission at the upper end. When the screen cylinder rotates, it makes frictional contact with the driven idler, so that there is no shaft inside the screen cylinder.

[0045] The present invention adopts a cylindrical sieve barrel structure with no shaft inside and external drive, and there is no need to avoid the rotating shaft and shaft support structure to feed materials into the barrel. Therefore, raw sand can be directly fed into the inner part of the upper end of the sieve barrel. The raw sand will not be scattered into the finished sand due to obstruction, resulting in some waste being mixed into the finished sand. The feeding is smooth, efficient, and the output is high. Because there is no obstruction of the rotating shaft and shaft support structure, the spray water pipe can be led to the inside of the barrel body without affecting the rotation of the drum sieve. The water with pressure is directly sprayed onto the surface of the raw sand inside the barrel body to wash the raw sand, which greatly promotes the sand smaller than the sieve mesh aperture to be screened out from the finished sand screening outlet, and the waste larger than the sieve mesh aperture is pushed backward and discharged, improving the waste screening efficiency and reducing the water consumption. And directly spraying water onto the surface of the raw sand inside the barrel body can also wash the raw sand more fully, which is beneficial to washing the salt in the sea sand. After screening and washing, the chloride content (calculated by the mass of chloride ions) of the finished sand is less than 0.02%. The lower end of the present invention is connected to the driving motor through a transmission shaft, and a supporting wheel is installed at the rear end in a driven manner, with small vibration and low noise.

[0046] The present invention does not limit the specific structural form of the sieve barrel. Exemplarily, the sieve barrel 2 includes a cylindrical sieve barrel skeleton 16 and a sieve mesh 17. The sieve mesh 17 is installed inside the sieve barrel skeleton of the screening section 6. The sieve holes of the sieve mesh 17 serve as the finished sand screening outlet 8, and the gaps of the sieve barrel skeleton in the waste section 7 serve as the waste outlet 9.

[0047] In the prior art, due to the presence of a rotating shaft and shaft support structure inside the drum, it is difficult to install the rolling screen sieve mesh inside the barrel. The rolling screen sieve mesh can only be installed outside the barrel skeleton. Because there are many steel bars in the barrel skeleton, the sieve mesh surface is blocked, and the effective area of the sieve mesh screening is reduced, greatly reducing the finished product passing rate of the sieve mesh and the screening efficiency. At the same time, when the main equipment is installed at a high position, the operation of replacing the outer sieve mesh of the round rolling sieve is highly dangerous. There is no standing fulcrum or fixed point for personnel, and the circular structure is likely to cause personnel to slip and fall. The barrel skeleton is located inside the sieve mesh. During screening, the raw materials are fed from the position of the front-end central axis with the skeleton and need to pass through the rotating skeleton to enter the inside of the sieve barrel for screening. The surface of the skeleton directly collides with the raw sand, with frequent contact friction and impact. The raw materials are splashed due to the impact of the rotating skeleton, and at the same time, it is easy to accelerate the wear of the skeleton, shortening the service life of the equipment. At the same time, it will also cause fragile waste such as shells to break due to collision and friction, forming fine particles smaller than the sieve holes and falling into the finished sand together with the finished sand, increasing the harmful substance content of the finished sand and being unfavorable for the effective separation of the impurities that are easily broken by impact.

[0048] Since there is no shaft inside the present invention, the sieve mesh can be arranged inside the skeleton, thus solving the above problems. The sieve mesh of the present invention can be a stainless steel punched sieve mesh or other materials. When installing the stainless steel punched sieve mesh, the stainless steel punched sieve mesh can be rolled up, placed inside the sieve barrel skeleton and released. Under the action of elasticity, the stainless steel punched sieve mesh expands and adheres to the inner surface of the inner layer skeleton, and then is fixedly installed on the inner layer skeleton by means of binding or the like.

[0049] The sieve mesh is punched from a stainless steel plate with a thickness of 1 - 5 mm or a plate made of other wear-resistant materials. The mesh holes are round or square holes, or a woven mesh is used with square mesh holes. The size of the mesh holes can be determined according to the particle conditions of the raw sea sand and the particle requirements of the finished product. The sieve mesh is installed inside the sieve cylinder skeleton. During screening, under the rotation of the sieve cylinder, the raw sand rises along the cylinder wall by friction. The part that slides down through the mesh holes forms the finished sand, and the part that cannot slide down and discharge on the mesh plate surface, such as shells and mud blocks, is the sieve residue waste, which is discharged from the gaps in the sieve cylinder skeleton at the tail.

[0050] The sieve cylinder skeleton 16 includes an outer layer support rod 18 arranged axially, an intermediate layer row frame 19 fixedly connected to the outer layer support rod 18 and arranged in a circular ring shape, and an inner layer skeleton 20 fixedly connected to the intermediate layer row frame 19 and arranged axially. The sieve mesh 17 is installed on the inner layer skeleton 20.

[0051] In one specific implementation, the outer layer support rod 18 is 4 - 12 seamless steel pipes with a diameter of 50 - 95 mm, serving as the main support. The intermediate layer row frame 19 is formed by bending a round steel with a diameter of 12 - 30 mm into a circle and welded to the outer layer support rod 18. The spacing between the intermediate layer row frames is 200 - 400 mm. The inner layer skeleton 20 is welded to the intermediate layer row frame 19 with a round steel with a diameter of 20 - 30 mm. The spacing of the inner layer skeleton is 200 - 500 mm, which can be used as the installation position of the sieve mesh, and the sieve mesh can be directly installed on the inner layer skeleton 20.

[0052] To reduce the small fragments knocked out by fragile harmful substances such as shells during screening from squeezing into the finished sand, along the direction of the raw sand feeding from front to back, the aperture of the finished sand screening outlet 8 gradually decreases.

[0053] In one specific implementation, along the direction of the raw sand feeding from front to back, a receiving plate 37, a first sieve mesh 38, a second sieve mesh 39, and a third sieve mesh 40 are sequentially installed inside the sieve cylinder skeleton of the screening section. The receiving plate is not provided with sieve holes. The aperture of the sieve holes of the first sieve mesh is 5 - 8 mm, the aperture of the sieve holes of the second sieve mesh is 4 - 5 mm, and the aperture of the sieve holes of the third sieve mesh is 3 - 4 mm.

[0054] The receiving plate 37 is a stainless steel plate or other wear-resistant plate with a thickness of 3 - 8 mm and a length of 200 - 500 mm, without sieve holes, which is used to buffer the impact force of the falling material during feeding, improve the service life of the sieve mesh; and reduce the fragile harmful substances in the raw material, such as shells, from squeezing through the sieve holes and mixing into the finished sand due to the impact force.

[0055] The screen aperture of the first screen 38 is 5-8 mm, and the width of the screen plate is 1000-1500 mm; the screen aperture of the second screen 39 is 4-5 mm, and the width of the screen plate is 1000-1500 mm; the screen aperture of the third screen 40 is 3-4 mm, and the width of the screen plate is 1000-1500 mm. The change of the screen aperture is beneficial to preventing the screened waste from entering the finished product; the end of the screen cylinder skeleton is left empty with a length of 200-500 mm for discharging the screened waste larger than the mesh hole.

[0056] During screening, most of the finished sand blanking is completed in the area of flushing and spraying. The multi-stage mesh hole arrangement is adopted to classify and screen the waste. While effectively increasing the amount of primary finished products in screening, it can reduce the waste from penetrating through the mesh holes into the primary finished products. When the waste is about to be discharged, a last-stage small-aperture mesh sheet is set, which can ensure that the waste larger than the mesh aperture can be smoothly discharged, while the fine particles in the raw sand will not be lost.

[0057] According to the different actual screening sea areas and fineness moduli of sea sand, the screen can be adjusted and spliced by three to six pieces. The specific number of pieces of the screen can be set according to the reasonable utilization size of the actual screen material and the experimental data results of sea sand raw materials in different sea areas. The mesh apertures of different divided blocks of the screen can be all of the same aperture, or can be arranged from large to small. The arrangement from large to small can reduce the situation that when shells or fragile harmful substances become smaller due to impact and are screened and fall into the finished sand. The size of the aperture can be set according to different requirements of the finished sand.

[0058] An annular inner baffle 21 is arranged inside the circumference of the aforementioned guide slip ring 14. The height of the inner baffle 21 is 150-400 mm, which is used to block the return material splashed into the rotating cylinder from the raw sand from splashing out.

[0059] An annular first outer baffle 22 is arranged on the outer circumference between the guide slip ring 14 and the finished sand screening outlet 8. The height of the first outer baffle 22 is 300-400 mm, which is used to block the blanking splashing from the finished sand screening outlet to the driven idler wheel, preventing the blanking from polluting the surface of the driven idler wheel and damaging the driven idler wheel.

[0060] An annular second outer baffle 23 is arranged on the outer circumference between the waste outlet 9 and the lower end surface of the screen cylinder. The width of the second outer baffle is 300-400 mm, preventing the waste from splashing to the motor drive part during discharging, polluting and damaging the motor drive device.

[0061] To improve the screening efficiency, an axial raw sand distributing rod 24 is arranged inside the screen cylinder 2 of the present invention. The raw sand distributing rod 24 is located inside the screen 17 and has a certain distance from the screen 17. An installation ring 25 is arranged at the upper end surface of the screen cylinder 2. The lower end surface of the screen cylinder 2 is closed by a plugging disc 26 arranged at the lower end surface. One end of the raw sand distributing rod 24 is installed on the plugging disc 26, and the other end passes through the installation ring 25 and is installed and positioned.

[0062] The present invention is provided with a raw sand distributing rod. 4 - 15 raw sand distributing rods with a diameter of 30 - 50 mm are inserted through the mounting ring 25. The installation position of the raw sand distributing rod is above the stainless steel punched screen, and the height from the screen surface is 20 - 100 mm. When waste is screened, the raw sand enters the screen cylinder and accumulates in large quantities at the front end of the screen cylinder. The raw sand distributing rod rotates with the screen cylinder to disperse the accumulated raw sand, spread out the raw sand, increase the distribution area of the raw sand on the stainless steel punched screen, and improve the screening efficiency. When the distributing rod is worn or the stainless steel punched screen needs to be replaced, as Figure 6 shown, just draw out the raw sand distributing rod to operate.

[0063] When screening sea sand raw materials with more mud lumps, the mud lumps roll and wrap the screenable raw sand, forming a spherical sand - mud lump with a certain binding force and rolling on the screen surface, and being discharged with the waste, resulting in waste of raw sand and a reduction in the finished product rate.

[0064] The present invention arranges the raw sand distributing rod. After the raw sand falls onto the screen surface, the mud lumps can be broken into a certain particle size along with the rotation of the screen cylinder. Under the various acting forces such as impact dispersion and friction of the distributing rod on the mud lumps contained in the screened raw materials, the sand and mud are separated.

[0065] A waste conveyor belt 29 is arranged below the waste outlet 9. Wastes such as shells, mud, and mud lumps are discharged from the waste outlet at the end of the screen cylinder and fall onto the waste conveyor belt and are transported to the waste area outside the factory for stacking. A raw sand feed hopper 30 is arranged inside the raw sand inlet 3.

[0066] The diameter of the spray pipe 4 is DN70 - 150 mm and can be of variable diameter. The material is seamless steel pipe, galvanized steel pipe, PVC, PPR or other water supply and drainage pipe materials. The length extending into the screen cylinder is 1.5 - 3.0 m and can be increased or decreased according to the actual situation. The spray pipe 4 is connected to the external water supply pipe 32 by bolts through a flange 31. When the spray pipe rusts or is damaged, only need to disassemble the flange to conveniently replace the pipe. At the same time, multi - stage nozzles are installed by drilling holes in the spray pipe to comprehensively spray the raw sand and improve the feeding efficiency.

[0067] Among them, the raw sand feed hopper and the external water supply pipe are arranged in sequence along the rotation direction of the screen cylinder. After the raw material enters the screen surface, along the rotation direction of the screen cylinder, under the action of friction, it rises along the rotation direction of the screen cylinder. The distributing rod disperses and spreads out the piled - up raw materials, and then is sprayed by the external water supply pipe extending into the screen cylinder, realizing efficient screening and feeding after dispersion, spreading, and spraying.

[0068] The aforementioned first outer baffle 22 and the mounting ring 25 are of an integral structure, which is integrally formed by casting steel. The mounting ring 25 is connected to the upper end surface of the screen cylinder frame 16.

[0069] The inner baffle 21 and the guiding sliding ring 14 are of an integral structure, which is formed by one-time molding of 30-mm-thick cast steel or by bending a 30-mm-thick steel plate into a circle. The inner baffle 21 is connected to the mounting ring 25.

[0070] The mounting ring is drilled according to the positions of the outer support rods and the inner skeleton of the sieve cylinder skeleton. After the mounting ring and the sieve cylinder skeleton are assembled, they are welded or bolted. Then, the mounting ring and the inner baffle 21 are bolted together. When the guiding sliding ring 14 is worn due to frictional contact with the conical supporting wheel and needs to be replaced, only the connecting bolts between the mounting ring and the inner baffle 21 need to be removed, and the integral inner baffle 21 and guiding sliding ring 14 can be replaced independently, without the need to simultaneously remove and replace the first outer baffle 22 and the mounting ring 25. At the same time, the mounting ring 25 is drilled circumferentially for installing the material distributing rod and is assembled with bolts.

[0071] The second outer baffle 23 and the plugging disc 26 are of an integral structure, which is formed by one-time molding of 30-mm-thick cast steel or by bending a 30-mm-thick steel plate into a circle. The plugging disc 26 is welded or bolted to the lower end surface of the sieve cylinder skeleton 16, and the plugging disc 26 is connected to the motor through a transmission shaft.

[0072] In the present invention, the motor 13 is installed on the frame 2, and the output shaft 27 of the motor is horizontally arranged. Since the sieve cylinder is inclined, if the driving part is installed in the traditional way, the reducer and the motor will have an inclination angle of 4 - 7 degrees. In the present invention, the output shaft 27 of the motor is connected to the transmission shaft 10 through a universal joint coupling 28. The universal joint coupling eliminates the included angle between the output shafts of the reducer and the motor and the sieve cylinder body, and solves the problem of the rotational start of the inclined sieve cylinder.

[0073] The outer surface shape of the aforementioned driven supporting wheel 15 can be conical. Of course, it can also not be conical, as long as the driven supporting wheel is installed obliquely.

[0074] In the present invention, each component such as the sieve cylinder skeleton, the sieve mesh, the inner baffle and the guiding sliding ring, the first outer baffle and the mounting ring, the second outer baffle and the plugging disc, the driven supporting wheel, the universal joint coupling, the motor, the pulley, the reducer, and the spray pipe are processed separately and then assembled into an integrated machine, which is detachable and convenient for disassembly and maintenance in the later stage.

[0075] The sea sand waste screening machine of the present invention further includes a controller 33, a metering device 34, an electrically controlled water outlet valve 35, and a frequency converter 36. During the working process, the metering device 34 measures the weight of the incoming raw sand in real time, and the controller 33 controls the frequency converter 36 and the electrically controlled water outlet valve 35 according to the weight to adjust the rotation speed of the motor 13 and the water spraying amount of the spray pipe 4.

[0076] The specific process is as Figure 12 shown, including:

[0077] The controller issues an operation instruction, the frequency converter receives the instruction and starts at a low speed, the sieve drum rotates, the electric control water outlet valve starts, the spray pipes inside the drum are filled with water for spraying, and the raw sand is fed.

[0078] The fed raw sand is weighed by an electronic weigher, and the weight signal is fed back to the controller. According to the set output value, when the output is insufficient, the controller automatically increases the frequency of the frequency converter and the motor speed according to the fed ultra-low weight value. When the sieve drum speed is increased, the raw sand rises higher in the sieve drum, the sliding distance during the downward movement is longer, and the screening efficiency is higher. At the same time, a signal is sent to the electric control water outlet valve to increase the water volume, thereby increasing the screening amount of the finished sand.

[0079] When the screening output is too large, the controller reduces the frequency of the frequency converter and the motor speed according to the fed over-limit weight value. At the same time, a signal is sent to the electric control water outlet valve to reduce the water volume, thereby reducing the screening amount of the finished sand.

[0080] When there are two different types of raw sand in the production line and they need to be screened by different screening machines respectively, one, two or three screening machines can be used as a unit, divided into two or three groups, and screened independently, as Figure 1 shown.

[0081] The embodiments of the present invention have the following beneficial effects:

[0082] 1. In the present invention, each component is processed separately and then assembled into an integrated machine form, which solves the defect that when the components of the existing shafted circular sieve drum are worn or damaged, they cannot be repaired locally and can only be replaced as a whole.

[0083] 2. Compared with the linear vibrating screen, the present invention has a low cost and high cost performance.

[0084] 3. The present invention has no main shaft, and the spray pipes can extend into the sieve drum to directly spray the surface of the raw sand, and the screening and feeding efficiency is higher.

[0085] 5. A material distributing rod is provided. When rotating and screening, the raw sand can be spread, the stacking thickness of the raw sand when it first enters the screen is reduced to a greater extent, the sliding distance of the raw sand on the surface of the stainless steel perforated screen is increased, and the screening efficiency is further improved.

[0086] 6. For the present invention with a diameter of more than 1.2 m and no main shaft, when replacing the stainless steel perforated screen, the operator can enter the sieve drum body for operation, and the operation is more convenient.

[0087] 7. Frequency conversion control is adopted by the controller, and the rotation speed is 8 - 20 revolutions per minute, which can efficiently adjust the screening efficiency in real time according to the target screening amount.

[0088] 8. The screening production capacity of the present invention for screening sea sand aggregate reaches 100 - 150 cubic meters per hour, which is much greater than the waste screening capacity of the existing shafted circular sieve.

[0089] 9. Spraying water directly onto the surface of the raw sand inside the cylinder can wash the raw sand more thoroughly, which is beneficial to washing the salt in the sea sand. After screening and scouring, the chloride content (calculated by the mass of chloride ions) of the finished sand is less than 0.02%.

[0090] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A sea sand waste screening machine, characterized in that, it includes a frame and a sieve cylinder inclined at a certain angle to the horizontal plane, wherein: the sieve cylinder is a cylindrical shape with an open upper end face and a closed lower end face. The upper end face of the sieve cylinder is the raw sand inlet. A spray pipe is arranged at the raw sand inlet inside the sieve cylinder. The sieve cylinder is successively a sieve section and a waste section along the direction of raw sand feeding from front to back. A number of finished sand screening outlets are arranged on the side wall of the sieve section, and a number of waste outlets are arranged on the side wall of the waste section; the lower end face of the sieve cylinder is connected to a motor through a transmission shaft located outside the sieve cylinder. The transmission shaft is supported on the frame. A guiding slip ring is arranged at the outer circumference of the upper end face of the sieve cylinder, and the guiding slip ring cooperates with a driven supporting wheel installed on the frame; the sieve cylinder includes a cylindrical sieve cylinder skeleton and a sieve mesh. The sieve mesh is installed inside the sieve cylinder skeleton of the sieve section. The sieve holes of the sieve mesh serve as the finished sand screening outlets, and the gaps of the sieve cylinder skeleton in the waste section serve as the waste outlets; the sieve cylinder skeleton includes axially arranged outer layer support rods, a middle layer row frame fixedly connected with the outer layer support rods and arranged in a circular ring shape, and an inner layer skeleton fixedly connected with the middle layer row frame and arranged axially. The sieve mesh is installed on the inner layer skeleton; along the direction of raw sand feeding from front to back, the aperture of the finished sand screening outlets gradually decreases; a circular inner baffle is arranged inside the circumference of the guiding slip ring. A circular first outer baffle is arranged at the outer circumference between the guiding slip ring and the finished sand screening outlets. A circular second outer baffle is arranged at the outer circumference between the waste outlet and the lower end face of the sieve cylinder; an axially arranged raw sand distributing rod is arranged inside the sieve cylinder. The raw sand distributing rod is located inside the sieve mesh and is spaced 20 - 100 mm from the sieve mesh. An installation ring is arranged at the upper end face of the sieve cylinder. The lower end face of the sieve cylinder is closed by a sealing disc arranged at the lower end face. One end of the raw sand distributing rod is installed on the sealing disc, and the other end passes through the installation ring and is installed and positioned; a waste conveyor belt is arranged below the waste outlet. A raw sand feeding hopper is arranged inside the raw sand inlet. The spray pipe is connected to an external water supply pipe through a flange; the first outer baffle and the installation ring are of an integral structure, and the installation ring is connected to the upper end face of the sieve cylinder skeleton; the inner baffle and the guiding slip ring are of an integral structure, and the inner baffle is connected to the installation ring; the second outer baffle and the sealing disc are of an integral structure, and the sealing disc is connected to the lower end face of the sieve cylinder skeleton.

2. The sea sand waste screening machine according to claim 1, characterized in that, along the direction of raw sand feeding from front to back, a receiving plate, a sieve mesh one, a sieve mesh two and a sieve mesh three are successively installed inside the sieve cylinder skeleton of the sieve section; the receiving plate is not provided with sieve holes. The aperture of the sieve holes of the sieve mesh one is 5 - 8 mm, the aperture of the sieve holes of the sieve mesh two is 4 - 5 mm, and the aperture of the sieve holes of the sieve mesh three is 3 - 4 mm.

3. The sea sand waste screening machine according to claim 2, characterized in that, the raw sand feeding hopper and the external water supply pipe are arranged successively along the rotation direction of the sieve cylinder.

4. The sea sand waste screening machine according to claim 1, characterized in that, the motor is installed on the frame, the output shaft of the motor is horizontally arranged, the output shaft of the motor is connected to the transmission shaft through a universal joint coupling, and the outer surface of the driven supporting wheel is conical.

5. The sea sand waste screening machine according to claim 1, characterized in that, the sea sand waste screening machine further includes a controller, a metering device, an electrically controlled water outlet valve and a frequency converter. Among them, the metering device measures the weight of the incoming raw sand in real time, and the controller controls the frequency converter and the electrically controlled water outlet valve according to the weight to adjust the rotation speed of the motor and the water spraying amount of the spray pipe.

Images