Tilt-adjustable cycloidal air separation vibrating screen

Abstract

This invention relates to an adjustable-angle circulating air-separation vibrating screen, comprising a screen box, a frame, a transmission device, a feeding and leveling device, a suspension rod device, an angle adjustment device, a leveling device, and a circulating air-separation impurity removal device. The screen box is suspended on the frame by the suspension rod device. An angle adjustment device is provided between the screen box and the frame. The angle adjustment device adjusts the tilt angle of the screen box by adjusting the height of one end of the screen box. A circulating air-separation impurity removal device is provided at the upper end of the screen box. The circulating air-separation impurity removal device is connected to the feeding and leveling device and is used to remove light impurities from the grain material in the feeding and leveling device. A transmission device and a leveling device are provided at the lower end of the screen box. The transmission device is installed in the middle of the leveling device and drives the screen box to perform planar rotation. The leveling device is used to level the transmission device. The angle adjustment device and the leveling device enable the adjustable tilt angle of the screen box, allowing the vibrating screen to adapt to the screening and cleaning of various grain materials and ensuring the cleaning effect.

Description

Technical Field

[0001] This invention belongs to the technical field of grain screening, dust removal, and impurity removal equipment, specifically relating to a circulating air-separated vibrating screen with adjustable tilt angle. Background Technology

[0002] When grains are stored, they often contain impurities (such as straw) and dust. If these impurities are present in the grain, they can cause it to heat up and mold, hindering its flow out of the warehouse, resulting in significant losses and reduced efficiency. Therefore, preliminary cleaning of the grain is essential before storage to remove impurities and some dust. Currently, vibrating screens are commonly used for this preliminary cleaning. The screen surface moves in a circular motion in the horizontal plane, while the grain material moves in a circular motion relative to the screen surface, which is tilted at a certain angle. The material's motion is a combination of circular and linear motion. Vibrating screens promote automatic grading of materials. The relative travel distance of the material on this screen is the longest, and the horizontal inertial force on the particles changes direction periodically within a 360° range, making it less prone to clogging the screen holes and resulting in high screening efficiency and productivity. This type of screen is commonly used for grading and removing impurities from powders and granules, and it is particularly effective in cleaning operations.

[0003] Existing vibrating screens typically consist of a screen box equipped with sieve grids suspended from a frame via a universal joint. A transmission device is located at the bottom of the screen box, which drives the screen box to rotate horizontally, generating vibration to screen and remove impurities from the grain materials entering the box. However, during use, it has been found that existing vibrating screens require the rotation to be parallel to the horizontal plane; otherwise, abnormal vibration will occur. This limits the use of a fixed-angle screen box, meaning the sieve grids within the screen box have a fixed inclination angle. However, as a general-purpose grain cleaning device, it can be used to clean various materials such as soybeans, corn, wheat, and rice. These materials have significantly different flowability. To ensure cleaning effectiveness, a smaller sieve grid inclination angle is needed for flowable grains, while a larger angle is required for flowable grains. The fixed sieve grid inclination angle of existing vibrating screens cannot be adjusted, resulting in poor cleaning performance for some materials.

[0004] In addition, when grain material enters the upper screen grid inside the screen box from the feeding and equalization device, various impurities in the grain material also enter the upper screen grid of the screen box. Large light impurities in the impurities can easily clog the screen holes of the upper screen grid, seriously affecting the output of the vibrating screen. Medium-sized light impurities accompany the grain particles into the second screen grid, which can easily lead to an increase in the thickness of the material on the second screen grid, affecting the screening effect and reducing the output. Summary of the Invention

[0005] In summary, to overcome the shortcomings of existing technologies, this invention provides an adjustable-angle circulating air-separation vibrating screen. The screen box is suspended on a frame via a hanger. An angle adjustment device is installed on both the frame and the screen box support. This device raises or lowers one end of the screen box, thus adjusting its tilt angle. A leveling device is installed at the lower end of the screen box to ensure the transmission device remains horizontal. The angle adjustment device and the leveling device allow for adjustable tilt angles of the screen box, enabling the vibrating screen to adapt to the screening and cleaning of various grain materials and ensuring effective cleaning.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is implemented as follows:

[0007] An adjustable-angle circulating air-separation vibrating screen includes a screen box, a frame, a transmission device, a feeding and leveling device, a suspension device, an angle adjustment device, a leveling device, and a circulating air-separation impurity removal device. The screen box is suspended on the frame by the suspension device. The screen box contains multiple layers of sieves for screening grain materials. A feeding channel is located at the top of the frame. The lower opening of the feeding channel is connected to the feed inlet of the screen box via a flexible connection. A feeding and leveling device is located at the upper end of the frame. The discharge outlet of the feeding and leveling device is connected to the upper opening of the feeding channel. An angle adjustment device is provided between the frame and the screen box. The angle adjustment device adjusts the tilt angle of the screen box by adjusting the height of one end of the screen box. A circulating air separation and impurity removal device is provided at the upper end of the screen box. The circulating air separation and impurity removal device is connected to the feeding and leveling device and is used to remove light impurities from the grain material in the feeding and leveling device. A transmission device and a leveling device are provided at the lower end of the screen box. The transmission device is installed in the middle of the leveling device. The transmission device drives the screen box to perform planar rotation. The leveling device is used to level the transmission device and keep the transmission device horizontal.

[0008] The technical solution of the present invention can also be implemented as follows: the leveling device includes a crossbeam, a leveling shaft, and a support frame. Two parallel crossbeams are provided at the lower end of the screen box. The two ends of the crossbeams are fastened to the side plates of the screen box. A support frame is provided between the crossbeams. A leveling shaft is provided at both ends of the support frame. The leveling shaft is arranged parallel to the crossbeams. The leveling shaft is rotatably connected to the side plates of the screen box through a bearing assembly. One side of the support frame is connected to the crossbeam through a leveling screw. The other end of the support frame is connected to another crossbeam through a spring. The transmission device is fastened to the support frame.

[0009] The technical solution of the present invention can also be implemented as follows: the feeding and leveling device includes a feeding shell, a guide plate, a discharge plate, a leveling plate, a leveling transmission device, and a feeding adjustment device. The feeding shell contains a guide plate and a discharge plate arranged at relatively inclines, forming a funnel-shaped discharge channel. An inlet is provided on the feeding shell above the discharge channel, and a leveling plate is provided in the feeding shell below the discharge channel. A gap exists between the lower ends of the leveling plate and the discharge plate, which serves as the outlet of the discharge channel. A leveling transmission device is provided in the feeding shell below the guide plate, and the leveling plate is connected to the leveling transmission device. The leveling transmission device drives the leveling plate to swing up and down. A feeding adjustment device is provided in the feeding shell for feeding... The adjusting device is connected to the uniform material plate. The feeding adjusting device adjusts the size of the gap between the uniform material plate and the lower end of the discharge plate. A guide plate is arranged parallel to the discharge plate in the feeding housing below the discharge plate. A discharge plate is arranged in the feeding housing below the uniform material plate. A waste discharge channel is formed between the discharge plate and the guide plate. A waste discharge port communicating with the waste discharge channel is provided on the feeding housing. A discharge channel is formed between the discharge plate and the guide plate. The waste discharge channel is connected with the discharge channel. The lower end of the discharge channel is connected with the feeding channel on the frame. The lower end of the guide plate is connected to the air inlet plate. An air inlet channel is formed between the air inlet plate and the bottom plate of the feeding housing. The air inlet channel is connected with the discharge channel. An air inlet communicating with the air inlet channel is provided on the feeding housing.

[0010] The technical solution of the present invention can also be implemented as follows: the material leveling transmission device includes a material leveling shaft, a material leveling motor, and an eccentric wheel. The material leveling motor is located on the outside of the feeding housing. The main shaft of the material leveling motor is connected to the material leveling shaft located inside the feeding housing. The material leveling shaft is rotatably connected to the feeding housing. The material leveling motor provides power for the rotation of the material leveling shaft. An eccentric wheel is keyed to the material leveling shaft. A connecting ring is fitted around the eccentric wheel. A diagonal brace for mounting the material leveling plate is fastened to the connecting ring. The material leveling plate is fastened to the diagonal brace.

[0011] The technical solution of the present invention can also be implemented as follows: the feeding adjustment device includes an adjusting rod, an adjusting shaft, an adjusting sleeve, an adjusting handle, a counterweight, and a connecting rod. The adjusting shaft is installed inside the feeding housing and is rotatably connected to the feeding housing. An adjusting handle is provided at one end of the adjusting shaft located outside the feeding housing. One end of the adjusting handle is connected to the adjusting shaft by a locking screw. A counterweight is connected to the adjusting handle by a locking screw. The installation position of the counterweight on the adjusting handle is adjustable. An adjusting sleeve is fitted on the adjusting shaft. The adjusting sleeve is connected to the adjusting shaft by a locking screw. A connecting rod is provided on the adjusting sleeve. One end of the connecting rod is fixedly connected to the adjusting sleeve, and the other end of the connecting rod is hinged to the upper end of the adjusting rod. The lower end of the adjusting rod is hinged to the uniform plate.

[0012] The technical solution of the present invention can also be implemented as follows: the circulating air classifier for removing impurities includes a blower, an air classifier housing, a separation cylinder, an impurity discharge cover, and a light impurity outlet. The air classifier housing is provided with an inlet channel, and the separation cylinder is disposed inside the air classifier housing, located at the upper part of the air classifier housing. One end of the inlet channel is connected to the impurity outlet channel of the feeding and leveling device, and the other end of the inlet channel is connected to the inner cavity of the air classifier housing above the separation cylinder. The inner cavity of the air classifier housing below the separation cylinder is a settling chamber, and a light impurity outlet is provided at the lower end of the settling chamber. A blower is installed on the outer side of the air classifier shell at both ends of the separation cylinder. The air inlet of the blower is connected to the inner cavity of the separation cylinder, and the air outlet of the blower is connected to the air inlet of the feeding and equalizing device through the air outlet pipe. The impurity discharge cover is installed and fastened to the top of the screen box. The gap between the impurity discharge cover and the top surface of the screen box forms a light impurity discharge channel. The light impurity discharge channel is connected to the large impurity removal channel of the screen box. The impurity discharge cover is provided with a light impurity inlet. The light impurity inlet is connected to the impurity outlet at the lower end of the air classifier shell through a flexible connection structure.

[0013] The technical solution of the present invention can also be implemented as follows: an air regulating plate is provided inside the air outlet duct.

[0014] The technical solution of the present invention can also be implemented as follows: the suspension device includes a rotating shaft, a suspension rod, an upper pressure seat, and a lower pressure seat. The rotating shaft is located at the lower part of the screen box, and a lower pressure seat that can rotate relative to the rotating shaft is fitted on the rotating shaft. A right-angled connecting angle plate is provided on the upper part of the frame. A vertically arranged elongated hole is provided on the vertical part of the connecting angle plate. The connecting angle plate is fastened to the frame by bolts passing through the elongated hole. The upper pressure seat is fixedly connected to the vertical part of the connecting angle plate. The upper pressure seat and the lower pressure seat are connected by the suspension rod.

[0015] The technical solution of the present invention can also be implemented as follows: the angle adjustment device includes an adjustment screw and an adjustment frame. The adjustment frame is fixedly installed at the upper end of the frame. The upper part of the adjustment screw is fastened to the adjustment frame by a nut. The lower end of the adjustment screw is fastened to the horizontal part of the connecting angle plate of the suspension rod device.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. This invention suspends the screen box on the frame via a hanger rod. The frame and screen box support are equipped with an angle adjustment device. The angle adjustment device raises or lowers one end of the screen box, thereby adjusting the tilt angle of the screen box. A leveling device is installed at the lower end of the screen box to ensure that the transmission device remains horizontal. The angle adjustment device and the leveling device enable the tilt angle of the vibrating screen to be adjustable, allowing the vibrating screen to adapt to the screening and cleaning of various grain materials and ensuring the cleaning effect.

[0018] 2. The lower end of the boom of the boom device of the present invention is connected to the lower pressure seat on the rotating shaft of the set. The rotating shaft is installed at the lower part of the screen box. The lower pressure seat can rotate relative to the rotating shaft. Therefore, when the screen box is raised or lowered by adjusting the screw, the lower pressure seat rotates relative to the rotating shaft, which can keep the boom installed on the lower pressure seat in a vertical state, thereby ensuring that the screen box can make stable planar rotation and keep the equipment stable.

[0019] 3. The lower end of the screen box of the present invention is provided with a transmission device and a leveling device. The two crossbeams of the leveling device are connected to the screen box, thereby realizing the connection between the leveling device and the transmission device and the screen box. One side of the support frame of the leveling device is connected to the crossbeam through a leveling screw, and the other end of the support frame is connected to another crossbeam through a spring. The middle part of the support frame is rotatably connected to the side plate of the screen box through a leveling shaft. By operating the leveling screw, the support frame can be rotated around the leveling shaft, thereby causing the transmission device set on the support frame to rotate. The relative angle of the transmission device can be adjusted. After adjusting the tilt angle of the screen box through the angle adjustment device, the transmission device at the lower end of the screen box also tilts. In order to ensure the stability of the plane rotation of the screen box, the transmission device must be kept horizontal. At this time, the leveling screw can be operated to make the support frame rotate around the leveling shaft, thereby adjusting the transmission device to be horizontal.

[0020] 4. The present invention provides a circulating air separation and impurity removal device connected to the feeding and leveling device above the screen box. During the falling process of the grain material in the feeding and leveling device, the light impurities in the grain material enter the air separation shell under the action of the fan along the impurity outlet channel of the feeding and leveling device and the air inlet channel of the circulating air separation and impurity removal device. After the airflow carrying the light impurities enters the air separation shell, since the space of the air separation shell is much larger than the space of the air inlet channel, the airflow speed slows down due to the sudden increase in space. The light impurities with a higher specific gravity carried in the airflow settle in the settling chamber, such as straw and other light impurities. After settling, the light impurities enter the light impurity discharge channel from the impurity outlet and slide down along the light impurity discharge channel. Finally, they are discharged from the large impurity removal channel of the screen box, so that the light impurities in the grain material do not enter the screen box, reducing the clogging of the screen mesh in the screen box, thereby ensuring the screening effect of the screen and improving the output of the vibrating screen.

[0021] 5. The air outlet of the blower of the circulating air separation and impurity removal device of the present invention is connected to the air inlet of the feeding and leveling device by an air regulating plate. The air regulating plate can be adjusted to regulate the air intake of the feeding and leveling device. When there are more light impurities in the grain material, the air intake of the feeding and leveling device can be increased. When there are fewer light impurities in the grain material, the air intake of the feeding and leveling device can be decreased.

[0022] 6. The feeding and leveling device of this invention is equipped with a leveling plate. The leveling transmission device uses the principle of eccentric transmission to drive the leveling plate to swing and vibrate, thereby achieving the purpose of leveling the material. The feeding and leveling device is also equipped with a feeding adjustment device. The feeding adjustment device uses the principle of counterweight and linkage. When the weight of the material on the leveling plate overcomes the weight of the counterweight, the leveling plate swings downward to increase the gap between the leveling plate and the feeding plate, so that the accumulated grain material on the leveling plate falls quickly, avoiding material accumulation and blockage. The leveling transmission device and the feeding adjustment device enable the leveling plate to have gravity adjustment, eccentric swing and vibration effects at the same time, resulting in better material distribution.

[0023] 7. The position of the counterweight on the adjusting handle of the present invention is adjustable. By adjusting the installation position of the counterweight on the adjusting handle, the flow rate of the material entering the screen box can be adjusted. The farther the counterweight is from the adjusting shaft, the greater the weight of the material required to overcome the weight of the counterweight. Based on this principle, in actual use, the feed adjusting device can preset the flow rate of the material entering the screen box as needed, and adjust the position of the counterweight on the adjusting handle according to the preset flow rate. When the material accumulated on the uniform plate is greater than the preset flow rate, the weight of the material overcomes the weight of the counterweight. At this time, the uniform plate opens downward, the gap between the uniform plate and the feed plate increases, and the grain material accumulated on the uniform plate falls quickly. For example, to reduce the thickness of material on the screen grid inside the screen box and ensure the cleaning effect of the screen box, a smaller flow rate of material entering the screen box can be preset. According to this flow rate, the installation position of the counterweight can be adjusted on the adjustment handle. When the amount of material entering the feeding and leveling device increases, the material accumulates on the leveling plate. When the weight of the material overcomes the weight of the counterweight, the leveling plate opens downward to unload the material, avoiding material accumulation and blockage. At the same time, it can also avoid the airflow being affected by too much material, ensuring the air separation and impurity removal effect.

[0024] 8. This invention has a simple structure, is easy to use, ingenious design, and low cost. It can effectively solve the problem of fixed tilt angle of the screen box in existing rotary vibrating screens, allowing the tilt angle of the screen box to be adjusted according to different materials being screened. This ensures that grain materials are screened and impurities are removed at the most suitable tilt angle, improving the screening and impurity removal effect. At the same time, by utilizing the principle of circulating air separation, light impurities in the material are removed before the grain materials enter the screen box, preventing light impurities from entering the screen box and reducing problems such as clogging of the screen mesh, effectively improving the screening and impurity removal effect and increasing efficiency. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 For the present invention Figure 1 A schematic diagram of the left-side view structure;

[0027] Figure 3 For the present invention Figure 1 A top-view structural diagram;

[0028] Figure 4 For the present invention Figure 1 A schematic diagram of the AA cross-sectional structure;

[0029] Figure 5 This is a schematic diagram of the leveling device of the present invention;

[0030] Figure 6 This is a schematic diagram of the feeding and equalization device and the circulating air separation and impurity removal device of the present invention;

[0031] Figure 7 This is a schematic diagram of the feeding adjustment device and the uniform material transmission device of the present invention. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, an adjustable-angle circulating air-separation vibrating screen includes: a screen box 1, a frame 2, a transmission device 3, a feeding and leveling device 4, a suspension rod device 5, an angle adjustment device 6, a leveling device 7, and a circulating air-separation impurity removal device 8. The screen box 1 is suspended on the frame 2 by the suspension rod device 5. The screen box 1 is equipped with multi-layer screens for screening grain materials. One side of the screen box 1 is provided with a large impurity removal channel, a small impurity removal channel, and a grain channel for removing impurities. The screen box 1 is used to screen and remove impurities from the grain materials entering the screen box 1. The suspension rod device 5 includes a rotating shaft 51, a suspension rod 52, an upper pressure seat 53, and a lower... The pressure seat 54 is located at the lower part of the screen box 1, and the rotating shaft 51 is mounted on the rotating shaft 51. The lower pressure seat 54, which can rotate relative to the rotating shaft 51, is mounted on the upper part of the frame 2. A right-angled connecting angle plate 55 is provided on the vertical part of the connecting angle plate 55. A vertically arranged elongated hole is provided on the vertical part of the connecting angle plate 55. The connecting angle plate 55 is fastened to the frame 2 by bolts passing through the elongated hole. An upper pressure seat 53 is fixedly connected to the vertical part of the connecting angle plate 55. The upper pressure seat 53 and the lower pressure seat 54 are connected by a hanger rod 52. The hanger rod 52 is a nylon rod or other hanger rod with high tensile strength and high toughness.

[0034] The top of the frame 2 is provided with a feeding channel 9. The lower opening of the feeding channel 9 is connected to the feeding port of the screen box 1 through a flexible connection structure. The upper end of the frame 2 is provided with a feeding and leveling device 4. The lower outlet of the feeding and leveling device 4 is connected to the upper opening of the feeding channel 9. The feeding and leveling device 4 includes a feeding shell 41, a guide plate 42, a discharge plate 43, a leveling plate 44, a leveling transmission device, and a feeding adjustment device. The feeding shell 41 is provided with a guide plate 42 and a discharge plate 43 arranged at opposite inclinations. The guide plate 42 and the discharge plate 43 form a funnel-shaped discharge channel 45. The feeding shell 41 above the discharge channel 45 is provided with a feeding port. The feeding shell 41 below the discharge channel 45 is provided with a leveling plate 44. There is a gap between the lower ends of the leveling plate 44 and the discharge plate 43. This gap is the discharge port of the discharge channel 45. The guide plate 42... A material leveling transmission device is installed inside the lower feed housing 41. The material leveling plate 44 is connected to the material leveling transmission device, which drives the material leveling plate 44 to swing up and down. The material leveling transmission device includes a material leveling shaft 412, a material leveling motor 413, and an eccentric wheel 414. The material leveling motor 413 is located on the outside of the feed housing 41. The main shaft of the material leveling motor 413 is connected to the material leveling shaft 412 located inside the feed housing 41. The material leveling shaft 412 is rotatably connected to the feed housing 41. The material leveling motor 413 provides power for the rotation of the material leveling shaft 412. An eccentric wheel 414 is keyed to the material leveling shaft 412. A connecting ring 415 is fitted around the eccentric wheel 414. A diagonal brace 416 for mounting the material leveling plate 44 is fastened to the connecting ring 415. The material leveling plate 44 is fastened to the diagonal brace 416.

[0035] A feeding adjustment device is provided inside the feeding housing 41. The feeding adjustment device is connected to the uniform plate 44 and adjusts the gap between the uniform plate 44 and the lower end of the discharge plate 43. The feeding adjustment device includes an adjusting rod 417, an adjusting shaft 418, an adjusting sleeve 419, an adjusting handle 420, a counterweight 421, and a connecting rod 422. The adjusting shaft 418 is inserted into the feeding housing 41 and is rotatably connected to the feeding housing 41. The adjusting handle 420 is provided at one end of the adjusting shaft 418 located outside the feeding housing 41. The adjusting shaft 418 is connected to the adjusting handle 420 via a locking screw. A counterweight 421 is connected to the adjusting handle 420 via a locking screw. The installation position of the counterweight 421 on the adjusting handle 420 is adjustable. An adjusting sleeve 419 is fitted onto the adjusting shaft 418. The adjusting sleeve 419 is connected to the adjusting shaft 418 via a locking screw. A connecting rod 422 is provided on the adjusting sleeve 419. One end of the connecting rod 422 is fixedly connected to the adjusting sleeve 419. The other end of the connecting rod 422 is hinged to the upper end of the adjusting pull rod 417. The lower end of the adjusting pull rod 417 is hinged to the uniform plate 44. A guide plate 46 is arranged parallel to the feeding plate 43 inside the feeding housing 41 below the feeding plate 43. A discharge plate 47 is arranged inside the feeding housing 41 below the equalizing plate 44. A waste discharge channel 48 is formed between the feeding plate 43 and the guide plate 46. A waste discharge port communicating with the waste discharge channel 48 is provided on the feeding housing 41. A discharge channel 49 is formed between the discharge plate 47 and the guide plate 46. The waste discharge channel 48 is connected to the discharge channel 49. The lower end of the discharge channel 49 is connected to the feeding channel 9 on the frame 2. The lower end of the guide plate 46 is connected to the air inlet plate 410. An air inlet channel 411 is formed between the air inlet plate 410 and the bottom plate of the feeding housing 41. The air inlet channel 411 is connected to the discharge channel 49. An air inlet communicating with the air inlet channel 411 is provided on the feeding housing 41.

[0036] An angle adjustment device 6 is provided between the frame 2 and the screen box 1. The angle adjustment device 6 adjusts the tilt angle of the screen box 1 by adjusting the height of one end of the screen box 1. The angle adjustment device 6 includes an adjustment screw 61 and an adjustment frame 62. The adjustment frame 62 is fixedly installed on the upper end of the frame 2. The upper part of the adjustment screw 61 is fastened to the adjustment frame 62 by a nut. The lower end of the adjustment screw 61 is fastened to the horizontal part of the connecting angle plate 55 of the hanging rod device 5.

[0037] A circulating air separation and impurity removal device 8 is provided at the upper end of the sieve box 1. The circulating air separation and impurity removal device 8 is connected to the feeding and leveling device 4 and is used to remove light impurities from the grain material in the feeding and leveling device 4. The circulating air separation and impurity removal device 8 includes a blower 81, an air separation shell 82, a separation cylinder 83, an impurity discharge cover 84, and a light impurity outlet. An impurity inlet channel 85 is provided on the air separation shell 82. The separation cylinder 83 is provided inside the air separation shell 82 and is located at the upper part of the air separation shell 82. One end of the impurity inlet channel 85 is connected to the impurity outlet channel 48 of the feeding and leveling device 4, and the other end of the impurity inlet channel 85 is connected to the inner cavity of the air separation shell 82 above the separation cylinder 83. The inner cavity of the air separation shell 82 below the separation cylinder 83 is a settling chamber 8. 6. A light impurity outlet is provided at the lower end of the settling chamber 86. A blower 81 is provided on the outer side of the air classifier shell 82 at both ends of the separation cylinder 83. The air inlet of the blower 81 is connected to the inner cavity of the separation cylinder 83. The air outlet of the blower 81 is connected to the air inlet of the feeding and equalizing device 4 through the air outlet pipe 87. An air regulating plate 89 is provided in the air outlet pipe 87. The impurity discharge cover 84 is covered and fastened to the top of the screen box 1. The gap between the impurity discharge cover 84 and the top surface of the screen box 1 forms a light impurity discharge channel 88. The light impurity discharge channel 88 is connected to the large impurity removal channel of the screen box 1. A light impurity inlet is provided on the impurity discharge cover 84. The light impurity inlet is connected to the impurity outlet at the lower end of the air classifier shell 82 through a flexible connection structure.

[0038] The lower end of the screen box 1 is equipped with a transmission device 3 and a leveling device 7. The transmission device 3 is installed in the middle of the leveling device 7. The transmission device 3 drives the screen box 1 to perform planar rotation. The leveling device 7 is used to level the transmission device 3, keeping the transmission device 3 horizontal. The leveling device 7 includes a crossbeam 71, a leveling shaft 72, and a support frame 73. The lower end of the screen box 1 is provided with two parallel crossbeams 71. The two ends of the crossbeams 71 are fastened to the side plates of the screen box 1. A support frame 73 is provided between the crossbeams 71. The two ends of the support frame 73 are provided with leveling shafts 72. The leveling shafts 72 are arranged parallel to the crossbeams 71. The leveling shafts 72 are rotatably connected to the side plates of the screen box 1 through bearing assemblies. One side of the support frame 73 is connected to the crossbeam 71 through a leveling screw 74. The other end of the support frame 73 is connected to the other crossbeam 71 through a spring 75. The transmission device 3 is fastened inside the support frame 73.

[0039] In use, start the fan 81 of the circulating air separation and impurity removal device 8, start the material leveling motor 413, and start the motor of the transmission device 3. The grain material enters the feeding and leveling device 4 from the feed port at the upper end of the feeding and leveling device 4. Under the action of the discharge plate 43 and the guide plate 42, the grain material flows downward along the discharge channel 45 and falls onto the material leveling plate 44. The material leveling plate 44 swings and vibrates under the drive of the material leveling transmission device. Through the swinging and vibration of the material leveling plate 44, the grain material flows out evenly from the gap between the material leveling plate 44 and the lower end of the discharge plate 43. When the weight of the material accumulated on the material leveling plate 44 overcomes the weight of the counterweight block 421 of the feeding adjustment device, the gap between the material leveling plate 44 and the lower end of the discharge plate 43 increases, and the grain material accumulated on the material leveling plate 44 falls quickly, thereby avoiding the accumulation and blockage of grain material in the discharge channel 45.

[0040] Material flowing out from the gap between the lower ends of the uniform plate 44 and the feed plate 43 enters the discharge channel 49 and flows downward along the discharge channel 49. Under the action of the blower 81, the airflow enters the feeding and uniform device 4 along the air inlet channel 411, and then enters the discharge channel 49 and flows upward. In the discharge channel 49, the airflow meets the grain material. Light impurities in the grain material flow upward with the airflow, while grain particles and heavier impurities continue to flow downward in the discharge channel 49, thereby separating the light impurities in the grain material. The airflow carrying the light impurities flows upward along the impurity outlet channel 48 and flows out of the feeding and uniform device 4. Then, it enters the air classifier housing 82 through the impurity inlet channel 85 on the air classifier housing 82. Under the action of the separator 83, larger light impurities in the airflow enter the settling chamber 86 and settle. The airflow enters the blower 81 through the inner cavity of the separator 83, and then re-enters the air inlet channel 411 of the feeding and leveling device 4 along the air outlet 87 of the blower 81. The airflow circulates between the air separation shell 82 and the feeding and leveling device 4 to remove light impurities from the grain material. The light impurities that settle in the settling chamber 86 flow out from the impurity outlet at the lower end of the settling chamber 86 and enter the light impurity discharge channel 88 between the impurity discharge cover 84 and the top surface of the screen box 1. They slide down along the light impurity discharge channel 88 and are finally discharged from the large impurity removal channel of the screen box 1, thus achieving the purpose of removing light impurities from the grain material.

[0041] After the light impurities are separated, the grain material continues to flow downward along the discharge channel 49, and enters the screen box 1 through the feed channel 9 on the frame 2 and the feed port of the screen box 1. The screen box 1 makes a planar rotational motion under the action of the transmission mechanism. The grain material entering the screen box 1 is screened and impurities are removed by the multi-layer screen grids in the screen box 1, thereby realizing the screening and impurity removal of the grain material.

[0042] When changing the type of grain material and needing to adjust the tilt angle of the screen box 1, loosen the bolts fastening the connecting angle plate 55 to the frame 2, and operate the adjusting screw 61 of the angle adjusting device 6. The adjusting screw 61 raises or lowers the connecting angle plate 55, thereby raising or lowering one end of the screen box 1 via the hanging rod device 5. The screen box 1 rotates around the pivot 51, which is connected to the frame 2 at its other end, thus increasing or decreasing the tilt angle of the screen box 1. After adjusting the tilt angle of the screen box 1, retighten the connecting bolts between the connecting angle plate 55 and the frame 2. Because the lower pressure seat 54 of the hanging rod device 5 is rotatably connected to the pivot 51, the hanging rod 52 remains vertical when raising or lowering one end of the screen box 1. The tilt angle of the screen box 1 is then adjusted. The leveling screw 74 of the leveling device 7 is operated, pressing down or raising one end of the support frame 73. Since the support frame 73 is connected to the side plate of the screen box 1 through the leveling shaft 72 and bearing assembly, the support frame 73 can rotate relative to the screen box 1 under the action of the adjusting screw 61. When the support frame 73 rotates to a horizontal position, the leveling screw 74 is locked. With the support frame 73 horizontal, the transmission device 3 installed inside the support frame 73 remains horizontal. Thus, the adjustment of the tilt angle of the screen box 1 is completed. During the adjustment process, keeping the hanging rod 52 vertical and the transmission device 3 horizontal ensures the planar rotational movement of the screen box 1 and the stable operation of the vibrating screen.

[0043] It should be noted that the above-described embodiments are illustrative of the technical solutions of the present invention and not limiting thereof. Equivalent substitutions or other modifications made by those skilled in the art based on the prior art, as long as they do not exceed the concept and scope of the technical solutions of the present invention, should be included within the scope of the claims of the present invention.

Claims

1. A circulating air-separating vibrating screen with adjustable tilt angle, characterized in that: The system includes a screen box (1), a frame (2), a transmission device (3), a feeding and leveling device (4), a hanging rod device (5), an angle adjustment device (6), a leveling device (7), and a circulating air separation and impurity removal device (8). The screen box (1) is suspended on the frame (2) by the hanging rod device (5). The screen box (1) is equipped with a multi-layer screen for screening grain materials. The top of the frame (2) is equipped with a feeding channel (9). The lower opening of the feeding channel (9) is connected to the feeding port of the screen box (1) through a flexible connection structure. The upper end of the frame (2) is equipped with a feeding and leveling device (4). The lower outlet of the feeding and leveling device (4) is connected to the upper opening of the feeding channel (9). The frame (2) and the screen box (1) are connected to each other. An angle adjustment device (6) is provided between the screen box (1) and the screen box (1). The angle adjustment device (6) adjusts the tilt angle of the screen box (1) by adjusting the height of one end of the screen box (1). A circulating air separation and impurity removal device (8) is provided at the upper end of the screen box (1). The circulating air separation and impurity removal device (8) is connected to the feeding and leveling device (4) and is used to remove light impurities in the grain material in the feeding and leveling device (4). A transmission device (3) and a leveling device (7) are provided at the lower end of the screen box (1). The transmission device (3) is installed in the middle of the leveling device (7). The transmission device (3) drives the screen box (1) to make planar rotational motion. The leveling device (7) is used to level the transmission device (3) so that the transmission device (3) remains horizontal. The feeding and leveling device (4) includes a feeding shell (41), a guide plate (42), a discharge plate (43), a leveling plate (44), a leveling transmission device, and a feeding adjustment device. The feeding shell (41) is provided with a guide plate (42) and a discharge plate (43) arranged at opposite inclinations. The guide plate (42) and the discharge plate (43) form a funnel-shaped discharge channel (45). The feeding shell (41) above the discharge channel (45) is provided with a feed inlet. The feeding shell (41) below the discharge channel (45) is also provided with a feed inlet. A uniform material plate (44) is provided inside. There is a gap between the uniform material plate (44) and the lower end of the feed plate (43). This gap is the outlet of the feed channel (45). A uniform material transmission device is provided inside the feed housing (41) below the guide plate (42). The uniform material plate (44) is connected to the uniform material transmission device. The uniform material transmission device drives the uniform material plate (44) to swing up and down. A feed adjustment device is provided inside the feed housing (41). The feed adjustment device is connected to the uniform material plate (44). The feed adjustment device adjusts the uniform material plate (44). 44) The size of the gap between the material feed plate (43) and the lower end of the material feed plate (43). A guide plate (46) is arranged parallel to the material feed plate (43) in the feed housing (41) below the material feed plate (43). A discharge plate (47) is arranged in the feed housing (41) below the material leveling plate (44). A waste discharge channel (48) is formed between the material feed plate (43) and the guide plate (46). A waste discharge port communicating with the waste discharge channel (48) is provided on the feed housing (41). A waste discharge port is formed between the discharge plate (47) and the guide plate (46). The discharge channel (49) is connected to the impurity discharge channel (48). The lower end of the discharge channel (49) is connected to the feed channel (9) on the frame (2). The lower end of the air guide plate (46) is connected to the air inlet plate (410). An air inlet channel (411) is formed between the air inlet plate (410) and the bottom plate of the feed housing (41). The air inlet channel (411) is connected to the discharge channel (49). An air inlet connected to the air inlet channel (411) is provided on the feed housing (41). The material leveling transmission device includes a material leveling shaft (412), a material leveling motor (413), and an eccentric wheel (414). The material leveling motor (413) is located on the outside of the feed housing (41). The main shaft of the material leveling motor (413) is connected to the material leveling shaft (412) located inside the feed housing (41). The material leveling shaft (412) is rotatably connected to the feed housing (41). The material leveling motor (413) provides power for the rotation of the material leveling shaft (412). An eccentric wheel (414) is keyed onto the material leveling shaft (412). A connecting ring (415) is fitted onto the eccentric wheel (414). A diagonal brace (416) for installing the material leveling plate (44) is fastened onto the connecting ring (415). The material leveling plate (44) is fastened onto the diagonal brace (416).

2. The adjustable-angle circulating air-separating vibrating screen according to claim 1, characterized in that: The leveling device (7) includes a crossbeam (71), a leveling shaft (72), and a support frame (73). The lower end of the screen box (1) is provided with two parallel crossbeams (71). The two ends of the crossbeams (71) are fastened to the side plates of the screen box (1). A support frame (73) is provided between the crossbeams (71). The two ends of the support frame (73) are provided with leveling shafts (72). The leveling shafts (72) are arranged parallel to the crossbeams (71). The leveling shafts (72) are connected to the side plates of the screen box (1) by bearing assembly. One side of the support frame (73) is connected to the crossbeam (71) by a leveling screw (74). The other end of the support frame (73) is connected to another crossbeam (71) by a spring (75). The transmission device (3) is fastened inside the support frame (73).

3. The adjustable-angle circulating air-separating vibrating screen according to claim 1, characterized in that: The boom device (5) includes a rotating shaft (51), a boom (52), an upper pressure seat (53), and a lower pressure seat (54). The rotating shaft (51) is located at the lower part of the screen box (1). The lower pressure seat (54) that can rotate relative to the rotating shaft (51) is fitted on the rotating shaft (51). The upper part of the frame (2) is provided with a right-angled connecting plate (55). The vertical part of the connecting plate (55) is provided with a vertically arranged elongated hole. The connecting plate (55) is fastened to the frame (2) by bolts passing through the elongated hole. The upper pressure seat (53) is fixedly connected to the vertical part of the connecting plate (55). The upper pressure seat (53) and the lower pressure seat (54) are connected by the boom (52).

4. The adjustable-angle circulating air-separating vibrating screen according to claim 3, characterized in that: The angle adjustment device (6) includes an adjustment screw (61) and an adjustment frame (62). The adjustment frame (62) is fixedly installed on the upper end of the frame (2). The upper part of the adjustment screw (61) is fastened to the adjustment frame (62) by a nut. The lower end of the adjustment screw (61) is fastened to the horizontal part of the connecting angle plate (55) of the hanging rod device (5).

5. The adjustable-angle circulating air-separating vibrating screen according to claim 1, characterized in that: The feed adjustment device includes an adjustment rod (417), an adjustment shaft (418), an adjustment sleeve (419), an adjustment handle (420), a counterweight (421), and a connecting rod (422). The adjustment shaft (418) is installed inside the feed housing (41) and is rotatably connected to the feed housing (41). An adjustment handle (420) is provided at one end of the adjustment shaft (418) located outside the feed housing (41). One end of the adjustment handle (420) is connected to the adjustment shaft (418) by a locking screw. The adjustment handle (420) is connected by a locking screw. There is a counterweight (421), the installation position of the counterweight (421) on the adjusting handle (420) is adjustable, the adjusting shaft (418) is fitted with an adjusting sleeve (419), the adjusting sleeve (419) and the adjusting shaft (418) are connected by a locking screw, the adjusting sleeve (419) is provided with a connecting rod (422), one end of the connecting rod (422) is fixedly connected to the adjusting sleeve (419), the other end of the connecting rod (422) is hinged to the upper end of the adjusting pull rod (417), and the lower end of the adjusting pull rod (417) is hinged to the uniform plate (44).

6. The adjustable-angle circulating air-separating vibrating screen according to claim 1, characterized in that: The circulating air separation and impurity removal device (8) includes a blower (81), an air separation shell (82), a separation cylinder (83), an impurity discharge cover (84), and a light impurity outlet. The air separation shell (82) is provided with an impurity inlet channel (85), and the separation cylinder (83) is provided inside the air separation shell (82). The separation cylinder (83) is located at the upper part of the air separation shell (82). One end of the impurity inlet channel (85) is connected to the impurity outlet channel (48) of the feeding and leveling device (4), and the other end of the impurity inlet channel (85) is connected to the inner cavity of the air separation shell (82) above the separation cylinder (83). The inner cavity of the air separation shell (82) below the separation cylinder (83) is a settling chamber (86), and a light impurity outlet is provided at the lower end of the settling chamber (86). A blower (81) is provided on the outer side of the air separation shell (82) at both ends of the separation cylinder (83). The air inlet of the blower (81) is connected to the inner cavity of the separation cylinder (83). The air outlet of the blower (81) is connected to the air inlet of the feeding and equalizing device (4) through the air outlet pipe (87). The impurity discharge cover plate (84) is covered and fastened to the top of the screen box (1). The gap between the impurity discharge cover plate (84) and the top surface of the screen box (1) forms a light impurity discharge channel (88). The light impurity discharge channel (88) is connected to the large impurity removal channel of the screen box (1). The impurity discharge cover plate (84) is provided with a light impurity inlet. The light impurity inlet is connected to the light impurity outlet at the lower end of the air separation shell (82) through a soft connection structure.

7. The adjustable-angle circulating air-separating vibrating screen according to claim 6, characterized in that: An air regulating plate (89) is installed inside the air outlet duct (87).

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