Spiral screening device

Abstract

Spiral screening equipment comprises a rack and a screening device installed in the middle of the rack, and an oversize product collecting device and an undersize product collecting device which are located on the two opposite sides of the screening device are further arranged in the rack. The screening device comprises a material barrel and a material bin used for conveying materials discharged from the bottom of the material barrel to the screen underflow collecting device. A vibrating screen used for screening materials is arranged in the charging barrel, a positioner used for positioning the vibrating screen is arranged in the middle of the stock bin, and a limiting channel corresponding to the vibrating screen is arranged on the inner wall of the charging barrel. The vibrating screen comprises a supporting framework and a screen mesh installed at the bottom of the supporting framework, and a plurality of supporting baffle rings used for dividing the screen mesh to conduct spiral feeding from outside to inside are formed on the supporting framework. Compared with the prior art, when materials enter a new screening channel, it is ensured that the materials make contact with the screen to achieve screening, the follow-up materials continuously enter the screen to be screened, and therefore the screening effect on the materials is improved.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, and specifically to a spiral screening device. Background Technology

[0002] In existing technologies, material is typically moved relative to the screen mesh via rotation or vibration to achieve screening. However, rotating the screen causes the material to move towards the edges due to centrifugal force, resulting in low utilization of the central area and a small overall effective screening area. Vibrating the screen, on the other hand, easily transmits vibration to the supporting structure and the ground. This continuous, high-frequency vibration not only generates noise pollution but may also shorten the lifespan of the equipment and surrounding structures over time. Chinese patent CN201010261488.5 discloses a vertical spiral vibrating screen that can significantly increase the screen area and extend the movement stroke of powder. It includes a base, a screen mounted on the base by several support springs, a vibrating device connected to the lower end of the screen and located within the base, a hopper mounted on the upper end of the screen, and a feed valve installed in the hopper. The screen includes a shell, a central column, and screens. The shell is a cylinder with a cover plate and a bottom plate, with a fine powder inlet and a coarse powder inlet at its lower part. The central column stands vertically in the center of the shell. The screen includes a bottom screen, side screens, and a top plate. The inner edge of the bottom screen is fixed to the central column and spirals down around it. The side screens are coaxially arranged with the central column and spiral down around it. The lower end of the side screens is connected to the outer edge of the bottom screen. The inner edge of the top plate is fixed to the central column and spirals down around it.

[0003] The aforementioned vibrating screen increases the material's travel distance by setting up a spiral structure. However, the material screened by this vibrating screen will fall onto the lower spiral structure under the action of gravity, thus affecting the collection effect of the screened material. It is difficult to ensure that the material passes through the vibrating screen. Moreover, after screening for a period of time, when the screen surface is covered with a layer of screened material, the material will slide down along the surface of the screened material under the action of its own gravity and vibration, affecting the screening effect of the material. Summary of the Invention

[0004] The present invention aims to overcome the defects in the prior art and provide a spiral screening device that is simple in structure, highly efficient in screening, and safe and reliable.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a spiral screening device, comprising a frame and a screening device installed in the middle of the frame, and the frame further comprising an oversize collection device and an undersize collection device located on opposite sides of the screening device; the screening device comprises a material cylinder and a hopper for conveying the material discharged from the bottom of the material cylinder to the undersize collection device; the material cylinder is provided with a vibrating screen for screening materials, the vibrating screen comprising a support frame and a screen installed at the bottom of the support frame, the support frame having a plurality of support rings formed thereon for dividing the screen into spiral feeding sections from the outside in, the support frame having a conical structure inclined downwards from the outside in; a vibrating motor for generating a spiral vibration trajectory for the material is installed at the bottom of the support frame, and the screen is located between the vibrating motor and the support frame.

[0006] As a preferred embodiment of the present invention, the support frame includes a support base for mounting support rings, a plurality of support rings are concentrically arranged at the center of the support base, and the plurality of support rings divide the screen into screening channels arranged independently from the outside to the inside, and the support rings are provided with inlets for connecting adjacent screening channels.

[0007] As a preferred embodiment of the present invention, the feed inlets on the several support rings are staggered, and the several feed inlets from the outside to the inside are progressively advanced layer by layer along the material movement direction, and the bottom height of the feed inlet is not higher than the highest height of the screening channel.

[0008] As a preferred embodiment of the present invention, the support frame has a tapered structure that slopes downward from the outside to the inside, and the support frame includes a screening base located in the middle of the support frame and a plurality of connecting strips arranged around the screening base. The support frame also includes a fixing ring for simultaneously connecting the plurality of support strips and a plurality of connecting rings. The fixing ring is connected to the ends of the plurality of support strips at the same time, the plurality of connecting rings are located between the fixing ring and the screening base, and a plurality of support retaining rings are arranged on the corresponding plurality of connecting rings.

[0009] As a preferred embodiment of the present invention, an initial feed inlet is formed between the fixed ring and the adjacent support ring for initial material accumulation, and the support ring has a bent structure for increasing the feed space of the initial feed inlet.

[0010] In a preferred embodiment of the present invention, the support retaining ring is vertically connected to the connecting ring, and the support retaining ring is located on the outer ring of the connecting ring.

[0011] As a preferred embodiment of the present invention, a flip cover corresponding to the material cylinder is formed on the top of the frame. The flip cover is hinged to the top of the frame, and a discharge port corresponding to the initial material port is formed on the flip cover. A viewing cover is formed on the flip cover and hinged to the flip cover. A suction port corresponding to the screening chassis is formed in the middle of the viewing cover.

[0012] As a preferred embodiment of the present invention, the hopper is provided with a positioner for positioning the vibrating screen in the middle, and the inner wall of the cylinder is provided with a limiting channel corresponding to the vibrating screen. The vibrating motor generates a three-dimensional composite excitation force that simultaneously vibrates horizontally, vertically, and tiltingly on the support frame.

[0013] As a preferred embodiment of the present invention, the oversize collection device is provided with a collection bucket and a suction pipe connected to the collection bucket, and the suction pipe passes through the suction port and is set corresponding to the screening base.

[0014] As a preferred embodiment of the present invention, the screening device further includes a support cylinder installed at the bottom of the silo, a discharge ramp formed on the side of the silo for conveying the material discharged from the bottom of the cylinder to the undersize collection device, and a mounting bracket for installing a vibrating motor and a protective box covering the vibrating motor formed on the side of the silo.

[0015] As a preferred embodiment of the present invention, the undersize material collection device is provided with a collection bucket corresponding to the discharge ramp.

[0016] Compared with existing technologies, by installing a vibrating screen for screening materials inside the material cylinder and dividing the screen into screening channels that are connected sequentially only through each feed inlet by several support rings, and each screening channel has a corresponding screen, and setting the initial feed inlet on the outermost screening channel, the material is screened through multiple screening channels. This ensures that the material is in contact with the screen when entering a new screening channel, thus achieving screening and meeting the requirement that subsequent materials continue to enter the screen for screening, thereby improving the screening effect of the material. By setting up multiple screening channels and combining them with a conical support frame, the screening area of ​​the screen during the screening process is increased, improving the screen utilization rate. At the same time, the screen is connected under the action of the support frame, which greatly increases the weight of materials that the screen can bear, thus meeting the requirements for effective screening of heavy materials. During the screening process, a vibrating motor drives the material to move in a vibrating manner within the screening channel. Combined with a conical support frame, this ensures that the material remains within the inner ring of the screening channel. When the material accumulates to a certain amount within the screening channel, it enters the next screening channel from the feed inlet under its own gravity, thus ensuring the screening effect of a single screening channel. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the screening device installation. Figure 3 This is a schematic diagram of the screening device; Figure 4 This is a schematic diagram of the installation of the vibration motor; Figure 5 Installation diagram of a vibrating screen; Figure 6 This is a schematic diagram showing the connection between the material cylinder and the hopper; Figure 7 This is a top view of the vibrating screen; Figure 8 This is a schematic diagram of the supporting skeleton; Figure 9 This is the main view supporting the skeleton; Figure 10 It is a bottom view of the supporting skeleton; Reference numerals: Frame 1, Flip-top 11, Discharge port 12, Visible cover 13, Suction port 14, Screening device 2, Material cylinder 21, Material bin 22, Support cylinder 23, Discharge ramp 24, Vibrating motor 25, Mounting bracket 26, Control knob 27, Positioner 28, Limiting channel 29, Oversize material collection device 3, Collection bucket 31, Suction pipe 32, Undersize material collection device 4, Material collection bucket 41, Vibrating screen 5, Support frame 6, Screen mesh 7, Support base 8, Screening chassis 81, Fixing ring 82, Connecting ring 83, Support bar 84, Initial material inlet 85, Support retaining ring 9, Feed inlet 91, Bending structure 92, Screening channel 10. Detailed Implementation

[0018] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] like Figures 1-10 As shown, a spiral screening device includes a frame 1 and a screening device 2 installed in the middle of the frame 1. The frame 1 also includes an oversize collection device 3 and an undersize collection device 4 located on opposite sides of the screening device 2. The screening device 2 includes a material cylinder 21 and a hopper 22 for conveying the material discharged from the bottom of the material cylinder 21 to the undersize collection device 4. The material cylinder 21 is equipped with a vibrating screen 5 for screening materials, and the hopper 22 is equipped with a positioner 28 for positioning the vibrating screen 5 in the middle. The inner wall of the material cylinder 21 is equipped with a limiting channel 29 corresponding to the vibrating screen 5. The vibrating screen 5 includes a support frame 6 and a screen 7 installed at the bottom of the support frame 6. The support frame 6 has several support rings 9 formed on it to divide the screen 7 into spiral feeds from the outside to the inside. The bottom of the support frame 6 is equipped with a vibrating motor 25 for driving the material to be spirally fed, and the screen 7 is located between the vibrating motor 25 and the support frame 6.

[0020] The oversize collection device 3 is used to receive the oversize material from the screening device 2, and the undersize collection device 4 is used to receive the undersize material from the screening device.

[0021] The material cylinder 21 is a hollow cylindrical structure. The hopper 22 is connected to the bottom of the material cylinder 21. Under the action of the vibrating screen 5, the undersize material after being screened by the vibrating screen 5 falls into the hopper 22 under its own gravity, while the oversize material after being screened by the vibrating screen 5 is located inside the vibrating screen 5 under the support of the vibrating screen 5.

[0022] The limiting channel 29 consists of two rubber rings arranged along the inner wall of the material cylinder 21. During use, the vibrating screen 5 is placed between the two rubber rings. During the vibration of the vibrating screen 5, the rubber rings are used to contact the vibrating screen 5 to buffer the vibration of the vibrating screen 5, thereby reducing the noise generated by the vibrating screen 5 during vibration.

[0023] The support frame 6 includes a support base 8 for mounting support retaining rings 9. A plurality of support retaining rings 9 are concentrically arranged around the center of the support base 8, and the plurality of support retaining rings 9 divide the screen 7 into screening channels 10 arranged independently from the outside to the inside. A feed port 91 for connecting adjacent screening channels 10 is formed on the support retaining rings 9.

[0024] The feed inlets 91 on several support rings 9 advance forward in circles from the outside to the inside along the direction of material movement, and the bottom of the feed inlet 91 corresponds to the highest point of the adjacent screening channel 10 on the outer ring.

[0025] The support frame 6 has a tapered structure that slopes downward from the outside to the inside. The support frame 6 includes a screening base 81 located in the middle of the support frame 6 and a plurality of connecting bars 84 arranged around the screening base 81. The support frame 6 also includes a fixing ring 82 and a plurality of connecting rings 83 for simultaneously connecting the plurality of support bars. The fixing ring 82 is connected to the ends of the plurality of support bars at the same time. The plurality of connecting rings 83 are located between the fixing ring 82 and the screening base 81. A plurality of support retaining rings 9 are arranged on the corresponding plurality of connecting rings 83.

[0026] An initial feed port 85 for initial material accumulation is formed between the fixed ring 82 and the adjacent support ring 9, and the support ring 9 has a bent structure 92 for increasing the feeding space of the initial feed port 85.

[0027] The support retaining ring 9 is vertically connected to the connecting ring 83, and the support retaining ring 9 is located on the outer ring of the connecting ring 83.

[0028] The screen 7 is fixedly connected to the lower surface of the support base 8 by welding. Under the action of the screening channel 10, the screen 7 is divided from the outside to the inside. Under the action of the support retaining ring 9, each screening channel 10 is independently divided. At the same time, each support retaining ring 9 has only one single feed port 91. Under the action of the feed port 91, the connection between adjacent screening channels 10 is realized. The material can only enter the adjacent screening channel 10 through the feed port 91. As the material passes through each feed port 91 in sequence, the movement path of the material on the screen 7 is increased, realizing the effective screening of materials by the screen 7.

[0029] The feed inlets 91 on several support rings 9 advance backward in circles from the outside to the inside along the direction of material movement, and the bottom of the feed inlet 91 corresponds to the highest point of the adjacent screening channel 10 on the outer ring. The feed inlet 91 is formed on the support ring 9 to ensure that the height of the support ring 9 is higher than the highest point of the corresponding adjacent screening channel 10 on the outer ring.

[0030] The bottom height of the feed inlet 91 is not higher than the maximum height of the screening channel 10, ensuring that the screening channel 10 always has a certain amount of material during the screening process. Only when the material in the screening channel 10 exceeds the rated amount will it enter the lower screening channel 10 through the feed inlet 91.

[0031] The initial feed port of the material is located behind the high-frequency vibration direction of the material. As a result, under the action of the vibration motor 25 driving the material to move along the screening channel 10, the material needs to move one circle in the corresponding screening channel 10 before it can enter the inner screening channel 10 through the feed port 91. The feed ports 91 on several support rings 9 are advanced backward from the outside to the inside along the high-frequency vibration direction of the material, ensuring that the material needs to move one circle in the corresponding screening channel 10 before it can enter the next inner screening channel 10 through the feed port 91, which greatly improves the surface utilization rate of the screen 8.

[0032] In actual use, the material is initially fed into the outermost screening channel 10. Under the action of the vibration motor 25, the material is driven to move along the length of the screening channel 10. Under the action of the conical support frame 6, it is ensured that the material is always in the inner circle of the screening channel 10 during the movement. Only when the material accumulates to a certain amount in the screening channel 10 will the material in the screening channel 10 enter the next screening channel 10 through the feed port 91.

[0033] The support frame 6 has a tapered structure that slopes downwards from the outside to the inside. Several support rings 9 are vertically set on the support frame 6. Under the action of the tapered support frame 6, the material slides towards the middle of the support frame 6 under its own gravity, ensuring that the material is always in the inner circle of the screening channel 10 during the movement, and also satisfying the requirement that the material enters the inner circle screening channel 10 through the outer circle screening channel 10.

[0034] The support frame 6 includes a screening base 81 and several support bars 84 arranged around the circumference of the screening base 81. The screening base 81 is located in the middle of the support frame 6.

[0035] The screening base 81 is located at the lowest point of the conical support frame 6. Several support bars 84 extend outward along the circumferential direction of the screening base 81. The support bars 84 are inclined according to the conical structure required by the support frame 6. The number of support bars 84 is set according to actual needs, and the support bars 84 are evenly distributed.

[0036] The support frame 6 also includes a fixing ring 82 and a connecting ring 83 for simultaneously connecting a plurality of support bars 84. The fixing ring 82 is connected to the ends of the plurality of support bars 84, the connecting ring 83 is located between the fixing ring 82 and the screening base 81, and a plurality of support retaining rings 9 are disposed on the corresponding connecting rings 83.

[0037] The fixing ring 82 is located at the outermost ring of the support frame 6. Both the connecting ring 83 and the fixing ring 82 are circular ring structures, and the connecting ring 83, the fixing ring 82 and the support bar 84 are integrated structures. The connecting ring 83, the fixing ring 82 and the support bar 84 are all fixedly connected to the screen 7 by welding. Under the contact action between the connecting ring 83, the fixing ring 82 and the support bar 84 and the screen 7, effective support for the screen 7 is achieved.

[0038] The screen 7 can effectively support heavy materials under the support of the connecting ring 83, the fixing ring 82 and the support bar 84. The connecting ring 83 and the fixing ring 82 are used to effectively support the support bar 84. The connecting ring 83 is used in conjunction with the support retaining ring 9. The number and position of the connecting ring 83 are set according to the actual number and position of the support retaining ring 9.

[0039] An initial feed opening 85 is formed between the fixed ring 82 and the adjacent support ring 9, and the support ring 9 has a bent structure 92 for increasing the feeding space of the initial feed opening 85. The initial feed opening 85 is located at the outermost ring of the support frame 6. The bent structure 36 is a concave structure formed in the support ring 9. Under the action of the bent structure 36, the distance between the bent structure 36 of the support ring 9 and the fixed ring 82 increases, thereby expanding the material feeding and initial accumulation position. Combined with the screen 7 being stably set under the support of the connecting ring 83, the fixed ring 82 and the support bar 84, it can meet the effective accumulation of heavy materials in the initial feed opening 85.

[0040] The screening channel 10 is an annular channel formed on the support frame 6, and the screening channel 10 is inclined downward from the outside to the inside. The support retaining ring 9 is located on the outer ring of the connecting ring 83. The screen 7 at the bottom of the screen channel 5 is inclined downward from the outside to the inside. Thus, within the screening channel 10 with a certain spacing, the inclined screen 7 has a better screening area, which can meet the requirement of screening more materials within the screening channel 10 with a certain spacing.

[0041] A positioner 28 for positioning the screening chassis 81 is installed in the middle of the screening chassis 81. The positioning head of the positioner 28 passes through the screening chassis 81 and limits the center of the screening chassis 81 under the action of the positioning head, so as to ensure the stability of the screening chassis 81 during vibration.

[0042] The vibrating motor 25 is provided with a vibration transmission rod arranged along the length of the support bar 84. The vibration transmission rod is used to transmit the vibration frequency transmitted by the vibrating motor 25, and the vibration transmission rod is in contact with the bottom surface of the screen 7. Under the vibration action of the vibration transmission rod, the vibration of the screen 7 is adjusted, thereby controlling the movement direction of the material.

[0043] By controlling the high-frequency reciprocating vibration of the vibration motor 25 along the annular tangential direction, the vibration motor 25 drives the support frame 6 to perform a periodic "clockwise-reset-clockwise" motion, thereby driving the material to move clockwise and satisfying the material's need to move on the screen 7.

[0044] The vibration motor 25 generates a three-dimensional composite excitation force that simultaneously vibrates horizontally, vertically, and tiltingly on the support frame 6. At both ends of the output shaft of the vibration motor 25, a set of adjustable-angle eccentric blocks are installed, namely the upper eccentric block and the lower eccentric block. When the motor is powered on and rotates, the upper and lower eccentric blocks generate centrifugal force due to the uneven mass distribution, which is the excitation force on the support frame 6. The centrifugal forces of the upper and lower eccentric blocks are combined in space to form a three-dimensional composite excitation of "horizontal + vertical + tilting".

[0045] The magnitude of the excitation force can be adjusted by adjusting the weight or relative angle of the eccentric blocks. The smaller the angle between the upper and lower eccentric blocks and the vertical direction, the greater the angle at which the upper and lower eccentric blocks are tilted, resulting in a greater combined excitation force and stronger screening force. Conversely, the larger the angle, the gentler the excitation force, which is suitable for fine screening and thus meets the screening requirements of different materials.

[0046] The horizontal vibration generated by the vibration motor 25 drives the support frame 6 to perform circumferential vibration, which is used to spread the material on the screen 7, thereby expanding the coverage area of ​​the material on the screen 7 and avoiding local accumulation.

[0047] The vertical vibration generated by the vibrating motor 25 drives the screen to vibrate up and down, generating a "throwing force" that periodically throws the material up, causing the material particles to separate from each other and become loosely layered (large particles on top and small particles on the bottom).

[0048] The tilting vibration generated by the vibrating motor 25 is formed by the angle difference between the upper and lower eccentric blocks, which drives the material to move slowly in the direction set.

[0049] During the movement of materials, the support ring 4 plays a role in supporting, limiting and guiding the materials.

[0050] The cross-section of the support frame 6 can be circular or non-circular. The structure of the cross-section of the support frame 6 can be set according to actual needs, and can be circular, square or irregular, with a circular structure being preferred.

[0051] A flip cover 11 corresponding to the material cylinder 21 is formed on the top of the frame 1. The flip cover 11 is hinged to the top of the frame 1, and a discharge port 12 corresponding to the initial material port 85 is formed on the flip cover 11. A viewing cover 13 is formed on the flip cover 11 and is hinged to the flip cover 11. A suction port 14 corresponding to the screening chassis 81 is formed in the middle of the viewing cover 13.

[0052] The flip cover 11 is rotatably connected to the frame 1 via a hinge, and the end of the flip cover 11 is provided with bolts for locking the flip cover 11 on the frame 1. The overall material cylinder 21 and vibrating screen 5 can be observed by opening the flip cover 11, and the vibrating screen 5 can also be disassembled and assembled by opening the flip cover 11.

[0053] The viewing cover 13 can be made of acrylic material, and the condition of the vibrating screen 5 can be observed through the viewing cover 13.

[0054] The screen material collection device 3 is equipped with a collection bucket 31 and a suction pipe 32 connected to the collection bucket 31. The suction pipe 32 passes through the suction port 14 and is set in accordance with the screen removal base 81.

[0055] The suction pipe 32 can suck up the material on the screen at the screening base 81. After opening the visible cover 13, the suction pipe 32 can be used to suck up the material on the screen at different screening channels 10 of the screen 7, thereby cleaning the screen 7.

[0056] The screening device 2 also includes a support cylinder 23 installed at the bottom of the hopper 22. A control knob 27 for controlling the positioner 28 is formed on the support cylinder 23. A discharge ramp 24 for conveying the material from the bottom of the cylinder 21 to the undersize collection device 4 is formed on the side of the hopper 22. A mounting bracket 26 for mounting the vibrating motor 25 and a protective box 28 covering the vibrating motor 25 are formed on the side of the hopper 22.

[0057] The support cylinder 23 is used to support the height of the hopper 22, thereby raising the height of the discharge ramp 24 to meet the requirement of the discharge ramp 24 to transport the material discharged from the bottom of the hopper 21 to the undersize collection device 4. The motor of the positioner 28 is located inside the support cylinder 23, and the positioner 28 passes through the hopper 22 and is connected to the vibrating screen 5.

[0058] The undersize material collection device 4 is equipped with a material collection bucket 41 corresponding to the discharge ramp 24.

[0059] In actual use, the whole vibrating screen 5 is installed in the material cylinder 21, and the inner wall of the material cylinder 21 is fitted with the outer wall of the vibrating screen 5 with a clearance. During the vibration of the vibrating screen 5, it comes into contact with the inner wall of the material cylinder 21. After installation, the material to be screened is fed into the initial material port 85 and piled up. Under the vibration of the vibrating motor 25, the material moves along the length of the screening channel 10.

[0060] Under the vibration of the vibrating motor 25, the bottom of the pile of material located at the initial feed port 85 is rubbed by the screen 7 and screened on the screen 7 under the vibration of the vibrating motor 25. Under the vibration of the vibrating motor 25, the pile of material is decomposed and moves along the length of the screening channel 10 until the pile of material is evenly spread in the screening channel 10 corresponding to the initial feed port 85.

[0061] Under the limiting action of the conical support frame 6 and the support retaining ring 9, the piled material is always located in the inner circle of the screening channel 10 and abuts against the support retaining ring 9 corresponding to the inner circle of the screening channel 10. During the movement of the material along the length of the screening channel 10, the material comes into contact with the screen 7 at the screening channel 10, so that the material is fully screened on the screen 7 of the screening channel 10.

[0062] As the material is gradually fed in, the material height in the outermost screening channel 10 gradually increases until the material accumulation in the corresponding screening channel 10 reaches the lowest point of the corresponding feed inlet 91, which means that the material overflows the corresponding feed inlet 91 at this time.

[0063] Material overflowing the corresponding feed inlet 91 enters the next inner screening channel 10 through the feed inlet 91. Similarly, it is vibrated by the vibration motor 25, causing the material to accumulate in the inner circle of the corresponding screening channel 10. During the vibration process, the material is screened on the screen 7 as it moves forward, until the material accumulation in the screening channel 10 reaches the lowest point of the corresponding feed inlet 91. Material overflowing the corresponding feed inlet 91 then enters the next inner screening channel 10 through the feed inlet 91.

[0064] Repeat the above operation until the material enters the screening chassis 81 through the innermost feed port 91, so that the material passes through each screening channel 10 in sequence, thereby greatly increasing the usable area of ​​the screen 7 and achieving effective screening of the material.

[0065] After screening is completed, the vibrating motor 25 is turned off by controlling knob 27 until the vibrating screen 5 is stationary. Then, the screening chassis 81 is suctioned through suction pipe 32, and the visible cover 13 is opened. The different screening channels 10 of the vibrating screen 5 are suctioned through hand-held suction pipe 32 to clean the vibrating screen 5.

[0066] The material can be selected according to actual needs. Assuming the material is wheat, the wheat bran needs to be removed during the screening process. After the wheat passes through each screening channel 10 in sequence, it falls through the screen 7. The bran is supported by the screen 7 or moves into the screening base 81. The screen 7 is vibrated by the vibrating motor 25, causing the bran to detach from the surface of the screen 7. The suction device is used to suction the bran in the screen 7 and the screening base 81, thus cleaning the entire vibrating screen.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention; therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0068] Although this document uses numerous reference numerals from the accompanying drawings—frame 1, flip cover 11, discharge port 12, viewing cover 13, suction port 14, screening device 2, material cylinder 21, hopper 22, support cylinder 23, discharge ramp 24, vibrating motor 25, mounting bracket 26, control knob 27, positioner 28, limit channel 29, oversize collection device 3, collection bucket 31, suction pipe 32, undersize collection device 4, collection bucket 41, vibrating screen 5, support frame 6, screen mesh 7, support base 8, screening chassis 81, fixing ring 82, connecting ring 83, support bar 84, initial material inlet 85, support retaining ring 9, feed inlet 91, bending structure 92, screening channel 10, etc.—the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A spiral screening device, comprising a frame (1) and a screening device (2) installed in the middle of the frame (1), wherein the frame (1) is further provided with an oversize collection device (3) and an undersize collection device (4) located on opposite sides of the screening device (2); characterized in that, The screening device (2) includes a material cylinder (21) and a hopper (22) for conveying the material discharged from the bottom of the material cylinder (21) to the undersize collection device (4); the material cylinder (21) is provided with a vibrating screen (5) for screening materials. The vibrating screen (5) includes a support frame (6) and a screen (7) installed at the bottom of the support frame (6). The support frame (6) has several support rings (9) formed on it for dividing the screen (7) into a spiral feeding structure from the outside to the inside. The support frame (6) has a conical structure that is inclined downward from the outside to the inside. The bottom of the support frame (6) is equipped with a vibrating motor (25) for generating a spiral vibration trajectory of the material. The screen (7) is located between the vibrating motor (25) and the support frame (6).

2. The spiral screening device according to claim 1, characterized in that, The support frame (6) includes a support base (8) for mounting support rings (9), a plurality of support rings (9) are concentrically arranged at the center of the support base (8), and the plurality of support rings (9) divide the screen (7) into screening channels (10) arranged independently from the outside to the inside, and a feed port (91) is formed on the support rings (9) for connecting adjacent screening channels (10).

3. The spiral screening device according to claim 2, characterized in that, The feed inlets (91) on several of the support rings (9) are staggered, and the feed inlets (91) from the outside to the inside are progressively advanced layer by layer along the direction of material movement, and the bottom height of the feed inlet (91) is not higher than the highest height of the screening channel (10) where it is located.

4. The spiral screening device according to claim 1, characterized in that, The support frame (6) includes a screening base (81) located in the middle of the support frame (6) and a number of connecting strips (84) arranged around the screening base (81). The support frame (6) also includes a fixing ring (82) and a number of connecting rings (83) for simultaneously connecting the number of support strips. The fixing ring (82) is connected to the ends of the number of support strips at the same time. The number of connecting rings (83) is located between the fixing ring (82) and the screening base (81). A number of support retaining rings (9) are arranged on the corresponding number of connecting rings (83).

5. A spiral screening device according to claim 4, characterized in that, The fixed ring (82) and the adjacent support ring (9) form an initial feed port (85) for initial material accumulation, and the support ring (9) has a bent structure (92) for increasing the feed space of the initial feed port (85).

6. A spiral screening device according to claim 4, characterized in that, The hopper (22) is provided with a locator (28) for positioning the vibrating screen (5) in the middle. The inner wall of the cylinder (21) is provided with a limiting channel (29) corresponding to the vibrating screen (5). The vibrating motor (25) generates a three-dimensional composite excitation force that simultaneously vibrates horizontally, vertically, and tiltingly on the support frame (6).

7. The spiral screening device according to claim 1, characterized in that, The top of the frame (1) is formed with a flip cover (11) corresponding to the material cylinder (21). The flip cover (11) is hinged to the top of the frame (1). The flip cover (11) is formed with a discharge port (12) corresponding to the initial material port (85). The flip cover (11) is formed with a visible cover (13) hinged to the flip cover (11). The middle of the visible cover (13) is formed with a suction port (14) corresponding to the screening chassis (81).

8. A spiral screening device according to claim 7, characterized in that, The screen material collection device (3) is equipped with a collection bucket (31) and a suction pipe (32) connected to the collection bucket (31). The suction pipe (32) passes through the suction port (14) and is set in relation to the screen removal chassis (81).

9. A spiral screening device according to claim 1, characterized in that, The screening device (2) also includes a support cylinder (23) installed at the bottom of the hopper (22), a discharge ramp (24) is formed on the side of the hopper (22) for conveying the material from the bottom of the cylinder (21) to the undersize collection device (4), and a mounting bracket (26) for installing the vibrating motor (25) and a protective box (28) covering the vibrating motor (25) are formed on the side of the hopper (22).

10. A spiral screening device according to claim 1, characterized in that, The undersize material collection device (4) is equipped with a material collection bucket (41) corresponding to the discharge ramp (24).

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