A new type of gravity screen box

Abstract

The present invention relates to the field of screening production technology, specifically a new type of gravity screen box, including a box body with a feeding part at the top and a discharging part at the bottom, and a screen surface with an arc-shaped cross section installed inside the box body, the screen surface is composed of a plurality of screen wires arranged, the cross section of the screen wire is an isosceles trapezoid, the large side of the screen wire faces forward, the small side faces backward, a screen gap is formed between two adjacent screen wires, there is an inclination between the two adjacent screen wires, and the two R angles on both sides of the large side of the screen wire are sharp angles. The present invention scrapes and cleans the material accumulated on the front side of the screen surface through the scraping mechanism to prevent excessive accumulation of materials and affect normal screening, and can flush and clean the screen surface from back to front through the flushing mechanism to avoid blockage of the screen gap affecting screening, and the driving mechanism provides drive for the scraping mechanism and the flushing mechanism to realize automated mobile scraping and flushing operations, and the scraping and flushing covers a wide range and has good effects, replacing traditional manual operations, saving time and effort, and being highly efficient.

Description

Technical Field

[0001] The invention relates to the technical field of screening production, in particular to a novel gravity screen box. Background Art

[0002] A gravity screen box is a device that sorts and screens material particles based on the principle of gravity and friction. It usually consists of an inclined screen or screen plate. The material is evenly distributed on the screen surface through the feed port above the screen. Under the action of the inclined angle, larger particles will slide down along the screen surface due to the greater force of gravity, and eventually gather at the bottom or side of the screen box. The discharge port, while smaller particles can fall through the screen holes and be collected by the discharge equipment below.

[0003] In the field of corn processing, after the corn is crushed and processed accordingly, it is necessary to use a gravity screen box for screening. The crushed corn crumbs are transported to the screen box, and the starch and moisture in the corn crumbs pass through the screen gaps in the screen box to become the undersize material, and the fiber fine residue flows out from the end of the screen surface to become the oversize material, thereby achieving the separation of moisture starch and fiber fine residue.

[0004] When the traditional gravity screen box is in use, the slope of the screen surface becomes smaller as it approaches the lower end, and the fiber fines cannot be guided smoothly at the lower end of the screen surface, and are easily accumulated, which can easily affect the material screening. The only way is to arrange staff to sweep away the accumulated fiber fines with brooms or other tools, which is time-consuming and labor-intensive. In addition, after the screen surface has been used for a period of time, the screen seams will be blocked by the corn fiber fines, resulting in a rapid decrease in screening effect. The traditional method is to manually flush it with a water pipe, but the flushing effect is poor and the labor intensity is high. Summary of the invention

[0005] The purpose of the present invention is to provide a new type of gravity screen box with automatic scraping and flushing functions to solve the technical problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions.

[0007] A novel gravity screen box comprises a box body with a feed part on the top and a discharge part on the bottom, and a screen surface with an arc-shaped cross-section installed inside the box body, wherein the screen surface is composed of a plurality of screen wires arranged in an isosceles trapezoidal cross-section, with the large side of the screen wire facing forward and the small side facing backward, a screen gap is formed between two adjacent screen wires above and below, with an inclination angle between the two adjacent screen wires, and two R corners on both sides of the large side of the screen wire are sharp angles, a scraping mechanism with a structure adapted to the shape of the screen surface is provided in the box body at the front side of the screen surface, the scraping mechanism is used for scraping the front side of the screen surface, a flushing mechanism with a structure adapted to the shape of the screen surface is provided in the box body at the rear side of the screen surface, the flushing mechanism is used for flushing and cleaning the screen gap from back to front, and a driving mechanism for driving the scraping mechanism and the flushing mechanism to realize mobile scraping and flushing cleaning is provided on one side of the box body.

[0008] The scraping mechanism is used to scrape and clean the materials accumulated on the front side of the screen surface to prevent excessive accumulation of materials and affect normal screening. The flushing mechanism can flush and clean the screen surface from back to front to prevent blockage of the screen gap and affect screening. The driving mechanism provides drive for the scraping mechanism and the flushing mechanism to realize automated mobile scraping and flushing operations. The scraping and flushing covers a wide range and has good effects, replacing traditional manual operations, saving time and effort and being highly efficient.

[0009] Preferably, the scraping mechanism includes a threaded rod A, a guide rod A, a plurality of nut seats A, a scraper plate and a scraper strip. The threaded rod A is rotatably installed in the box and is located in front of the screen surface. The guide rod A is fixed in the box and is located on one side of the threaded rod A. The threaded rod A and the guide rod A both extend along the width direction of the box. A plurality of nut seats A are equidistantly slidably installed on the guide rod A along its length direction. Each nut seat A is threadedly matched and mounted on the threaded rod A. A scraper plate and a scraper strip are installed on each nut seat A. The scraper plate and the scraper strip are slidably fitted against the front surface of the screen surface. The bottom end of the scraper strip is adjacent to the top end of the corresponding scraper plate, and the scraper strip is relatively inclined.

[0010] Preferably, the flushing mechanism includes a threaded rod B, a guide rod B, a plurality of nut seats B, an arc-shaped pipe and a high-pressure nozzle, the threaded rod B is rotatably installed in the box and is located at the rear side of the screen surface, the guide rod B is fixed in the box and is located on one side of the threaded rod B, the threaded rod B and the guide rod B both extend along the width direction of the box, a plurality of nut seats B are equidistantly slidably sleeved on the guide rod B, and are all threadedly matched and sleeved on the threaded rod B, a side of each nut seat B close to the screen surface is fixed with an arc-shaped pipe whose curvature matches the curvature of the screen surface, a plurality of high-pressure nozzles are arranged at intervals on each arc-shaped pipe along its extension direction, and each high-pressure nozzle is kept vertical at a corresponding position on the back of the screen surface, a guide pipe is also provided in the box, one end of the guide pipe extends to the outside of the box and is connected to the water tank, a plurality of connecting pipes are evenly distributed on the guide pipe, each connecting pipe is respectively connected to the corresponding arc-shaped pipe, each connecting pipe adopts a high-pressure resistant rubber hose, and a valve body is also installed on the guide pipe.

[0011] Preferably, the driving mechanism includes a cylinder, a moving seat, a pair of sliding plate seats, a pair of racks and a pair of gears. One end of the threaded rod A and the threaded rod B extend through the outside of the box and are fixedly installed with gears. The two sliding plate seats are movably mounted on the threaded rod A and the threaded rod B respectively through the clearance grooves provided thereon. Racks are fixed on the two sliding plate seats, and the two racks are respectively meshed and connected with the corresponding gears. The cylinder is vertically fixed to the side of the box through a mounting frame. A moving seat is fixed on the end of the telescopic rod of the cylinder, and the two sliding plate seats are respectively connected to the two sides of the moving seat.

[0012] Preferably, a guide rail A and a pair of guide rails B are vertically fixed on the box body, the moving seat is slidably installed on the guide rail A, and sliding seats are slidably installed on the two guide rails B. The two sliding plate seats are respectively fixed on the corresponding sliding plate seats, and mounting holes are respectively provided on both sides of the moving seat. Latch rods are slidably installed in the mounting holes. A pair of guide grooves are provided on the surfaces of the two moving seats, and the two guide grooves are respectively communicated with the mounting holes on the corresponding sides. A pinching handle is fixed on the two latch rods, and the pinching handle extends to the outside through the corresponding guide grooves. A clamping hole for the latch rod to be inserted and connected is provided on the side of the two sliding plate seats close to each other, and a magnet block that can magnetically cooperate with the latch rod is fixed on the inner end wall of the two clamping holes.

[0013] Preferably, a U-shaped seat is fixed at an angle at the bottom of the nut seat A, a screw is fixed on the U-shaped seat, a fastening nut is set on the screw with a matching thread, an adjustment plate is set on the screw between the side wall of the U-shaped seat and the fastening nut, the screw can be movably adjusted in the movable long groove on the adjustment plate, and the scraper plates are fixed on the adjustment plate one by one.

[0014] Preferably, the scraper strip is a detachable and replaceable part, each scraper strip has an insertion arm, the side of each nut seat A is fixed with a mounting seat, the mounting seat has an insertion groove for the insertion arm to be inserted, and the side of each mounting seat is inserted with a fastening bolt that can be screwed into the screw hole on the insertion arm.

[0015] Preferably, an air suction port communicating with the interior of the box is provided on the rear side of the box, and an air intake pipe communicating with the interior of the box is provided on the side of the box away from the driving mechanism, the air intake pipe port faces downward, and a filter is installed in the air intake pipe.

[0016] Preferably, the feed part includes a feed shell and a feed pipe. The feed shell is arranged on the top of the box body and communicated with the inside of the box body. The feed pipe is arranged on the rear side of the feed shell for feeding. The side of the feed shell opposite to the feed pipe is a curved guide part. The bottom of the curved guide part has a guide port whose guide direction is tangent to the screen surface. The discharge part includes a discharge port A and a discharge port B. The discharge port A is arranged at the bottom of the box body at the front side of the screen surface, and the discharge port B is arranged at the bottom of the box body at the rear side of the screen surface.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0018] 1. The present invention scrapes and cleans the materials accumulated on the front side of the screen surface through the scraping mechanism to prevent excessive accumulation of materials and affect normal screening. The screen surface can be flushed and cleaned from back to front through the flushing mechanism to avoid blockage of the screen seam affecting screening. The driving mechanism provides drive for the scraping mechanism and the flushing mechanism to realize automated mobile scraping and flushing operations. The scraping and flushing covers a wide range and has good effects, replacing traditional manual operations, saving time and effort and being highly efficient.

[0019] 2. The present invention arranges two adjacent screen wires in the screen surface in a relatively staggered and tilted manner so that the R angle above the screen wire is inclined and protrudes to form a sharp cutting edge, which produces a better cutting effect when the material passes through the screen surface. The inclined and protruding R angle can not only cut the material, but also intercept and guide the water and starch, thereby ensuring better screening effect and faster speed.

[0020] 3. The present invention can provide drive for flushing and scraping and pushing materials by setting a driving mechanism. The two functions share the same drive, which reduces the investment cost of the driving equipment. The driving mechanism and its supporting structure can effectively allocate the driving route, so that it can not only drive the mobile flushing operation separately, but also drive the mobile scraping and pushing operation separately, and can also drive the flushing and scraping and pushing material operations at the same time. It has complete functions, can select and switch functions according to needs, and is highly practical.

[0021] 4. The present invention operates by flushing and scraping the materials at the same time. Scraping and pushing are performed simultaneously during flushing, so that firmly adhered dry fibers and fine residues meet water, and combined with the scraping and pushing assistance of the scraper plate and the scraper bar, it is ensured that the front side of the screen surface can be effectively cleaned, further improving the cleaning effect of the screen surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is one of the three-dimensional schematic diagrams of the overall structure of the present invention;

[0023] Figure 2 This is the second three-dimensional schematic diagram of the overall structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the scraping mechanism in the present invention;

[0026] Figure 5 It is a schematic diagram of the flushing mechanism in the present invention;

[0027] Figure 6 It is a schematic diagram of the driving mechanism in the present invention;

[0028] Figure 7 It is a schematic cross-sectional view of a local structure in the present invention;

[0029] Figure 8 for Figure 7 A schematic diagram of the structure enlargement in the middle;

[0030] Fig. 9 It is a schematic diagram of the structural installation of the scraper plate and the scraper strip in the present invention;

[0031] Fig.10 This is one of the partial structural schematic diagrams of the surface of the nut seat A in the present invention;

[0032] Fig.11 This is the second schematic diagram of the local structure of the surface of the nut seat A in the present invention;

[0033] Fig.12 It is a schematic diagram of the sieve surface screening principle in the present invention.

[0034] In the figure: 1. box body; 101. air extraction port; 102. air inlet pipe; 11. feed part; 1101. curved guide part; 1102. guide port; 111. feed shell; 112. feed pipe; 12. discharge part; 121. discharge port A; 122. discharge port B; 2. screen surface; 21. screen wire; 22. screen slot; 23. R angle; 3. scraper mechanism; 31. threaded rod A; 32. guide rod A; 33. nut seat A; 34. scraper plate; 341. U-shaped seat; 342. screw rod; 343. adjustment plate; 3431. movable long slot; 344. fastening nut; 35. scraper strip; 351. mounting seat; 3511 , insertion slot; 352, fastening bolt; 353, insertion arm; 4, flushing mechanism; 41, threaded rod B; 42, guide rod B; 43, nut seat B; 44, arc pipe; 45, high-pressure nozzle; 46, guide pipe; 461, valve body; 47, connecting pipe; 5, driving mechanism; 51, cylinder; 511, mounting frame; 52, moving seat; 521, guide rail A; 53, sliding plate seat; 531, give way groove; 532, guide rail B; 533, sliding seat; 54, rack; 55, gear; 501, mounting hole; 502, guide groove; 503, clamping hole; 504, latch rod; 505, pinch handle; 506, magnet block. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 12The present invention provides a novel gravity screen box, including a box body 1 with a feed part 11 on the top and a discharge part 12 on the bottom, and a screen surface 2 with an arc-shaped cross-section installed inside the box body 1. The feed part 11 includes a feed shell 111 and a feed pipe 112. The feed shell 111 is arranged on the top of the box body 1 and communicates with the inside of the box body 1. The feed pipe 112 is horizontally arranged on the rear side of the feed shell 111 for feeding. In addition, each feed pipe 112 is provided with a feed valve for adjusting the feed flow rate.

[0037] like Figure 3 As shown, the side of the feed shell 111 opposite to the feed pipe 112 is a curved guide portion 1101, and the bottom of the curved guide portion 1101 has a guide port 1102 whose guide direction is tangent to the screen surface 2. A rear-mounted horizontal feeding method is adopted, and the material enters the feed shell 111 from the feed pipe 112 at a certain speed and impacts the curved guide portion 1101. The curved guide portion 1101 is used for reversing and guiding to disperse the material, and then the guide port 1102 is used to discharge the material onto the screen surface 2 at a certain speed. An inflow at a certain speed is beneficial to the filtering and flow of materials, making the filtering effect of materials better, and the materials are not easy to accumulate on the screen surface 2. According to the width of the screen surface 2, multiple feed pipes 112 are provided, and are arranged in an array along the width direction of the screen surface 2, so that the materials can flow evenly to the screen surface 2 for screening, thereby improving the screening effect. If it is found that more materials enter the middle part of the screen surface 2, the valve on the feed pipe 112 in the middle can be closed a little to reduce the feed amount and achieve uniform feeding.

[0038] like Figure 2 and Figure 3 As shown, the discharge portion 12 includes a discharge port A121 and a discharge port B122. The discharge port A121 is arranged at the bottom of the box body 1 in front of the screen surface 2, and the discharge port B122 is arranged at the bottom of the box body 1 in the rear side of the screen surface 2. The starch and liquid pass through the screen surface 2 and flow to the rear side of the screen surface 2, and are finally discharged through the discharge port B122, while the corn fiber and fine residue roll downward along the screen surface 2, and are finally discharged through the discharge port A121 to achieve screening. In addition, a support frame is arranged at the bottom of the box body 1 for supporting and lifting the box body 1 as a whole, so as to make space for the arrangement of the discharge port A121, the discharge port B122 and the material receiving device.

[0039] A scraper mechanism 3 having a structure adapted to the shape of the screen surface 2 is provided in the box body 1 at the front side of the screen surface 2. The scraper mechanism 3 is used to scrape the front side of the screen surface 2. A flushing mechanism 4 having a structure adapted to the shape of the screen surface 2 is provided in the box body 1 at the rear side of the screen surface 2. The flushing mechanism 4 is used to flush and clean the screen gap 22 from back to front. A driving scraper mechanism 3 and a flushing mechanism 4 are provided on one side of the box body 1. The scraper mechanism 3 is used to scrape and clean the material accumulated on the front side of the screen surface 2 to prevent excessive accumulation of materials and affect normal screening. The flushing mechanism 4 can flush and clean the screen surface 2 from back to front to prevent blockage of the screen gap 22 and affect screening. The driving mechanism 5 provides drive for the scraper mechanism 3 and the flushing mechanism 4 to realize automated mobile scraping and flushing operations. The scraping and flushing covers a wide range and has good effects, replacing traditional manual operations, saving time and effort, and being highly efficient.

[0040] As the instruction manual Fig.12 As shown, the screen surface 2 is composed of a plurality of screen wires 21 arranged in an arrangement, and the cross-section of the screen wire 21 is an isosceles trapezoid, with the large side of the screen wire 21 facing forward and the small side facing backward. A screen gap 22 is formed between two adjacent screen wires 21, and there is an inclination angle between two adjacent screen wires 21, so that the two adjacent screen wires 21 are relatively staggered and tilted, so that the R corner 23 above the large side of the screen wire 21 is inclined and protrudes obliquely. In addition, the two R corners 23 on both sides of the large side of the screen wire 21 are pointed, forming sharp cutting edges, which produce a better cutting effect when the material passes through the screen surface 2. The two adjacent screen wires 21 are relatively staggered and tilted, and the inclined and protruding R corner 23 can not only cut the material, but also intercept and guide the water and starch, thereby ensuring better screening effect and faster speed.

[0041] See also Figure 3 , Figure 4 and Fig. 9 The scraper mechanism 3 includes a threaded rod A31, a guide rod A32, a plurality of nut seats A33, a scraper plate 34 and a scraper strip 35. The threaded rod A31 is rotatably installed in the box body 1 and is located on the front side of the screen surface 2. The guide rod A32 is fixed in the box body 1 and is located on one side of the threaded rod A31. The threaded rod A31 and the guide rod A32 both extend along the width direction of the box body 1. A plurality of nut seats A33 are equidistantly slidably installed on the guide rod A32 along its length direction. Each nut seat A33 is threadedly matched and mounted on the threaded rod A31. A scraper plate 34 and a scraper strip 35 are installed on each nut seat A33. The scraper plate 34 and the scraper strip 35 both slide and fit with the front surface of the screen surface 2. The bottom end of the scraper strip 35 is adjacent to the top end of the corresponding scraper plate 34, and the scraper strip 35 is relatively inclined.

[0042] The driving mechanism 5 drives the periodic forward and reverse threaded rod A31 to rotate, and the rotating threaded rod A31 drives the nut seats A33 to reciprocate along the guide rod A32. The nut seat A33 drives the scraper plate 34 and the scraper bar 35 to reciprocate synchronously. The inclined scraper plate 34 can push and scrape the materials accumulated on the front surface of the screen surface 2 near the bottom to discharge the materials, and the scraper bar 35 can push and scrape the materials attached to the rest of the front side of the screen surface 2, thereby effectively preventing the materials from excessively accumulating on the front side of the screen surface 2 and affecting the screening. In addition, the reciprocating movement of the nut seat A33, combined with the staggered arrangement of the scraper plate 34 and the scraper bar 35, can ensure that the scraping range is sufficient to cover most of the area on the front side of the screen surface 2.

[0043] In addition, a scraper plate 34 and a scraper bar 35 are arranged on the same nut seat A33. The scraper plate 34 is used to push and scrape the material at the bottom of the front side of the screen surface 2. The scraper bar 35 is an extension above the scraper plate 34, which can supplement the range of the pushed and scraped material to ensure that the pushed and scraped material range is sufficient to cover the length of the screen surface 2. In addition, when the material is not pushed and scraped, the scraper bars 35 are arranged at intervals along the width direction of the screen surface 2, and the upper area on the front side of the screen surface 2 can be divided into multiple independent areas. The material falling on the screen surface 2 can be isolated and guided in different areas to avoid the material being concentrated in one area, thereby guiding the material to flow quickly on the screen surface 2, reducing the residence time, thereby improving the screening processing capacity, and improving the uniformity of screening, achieving multiple goals at one stroke.

[0044] See also Figure 3 and Figure 5 The flushing mechanism 4 includes a threaded rod B41, a guide rod B42, a plurality of nut seats B43, an arc-shaped pipe 44 and a high-pressure nozzle 45. The threaded rod B41 is rotatably mounted in the box body 1 and is located at the rear side of the screen surface 2. The guide rod B42 is fixed in the box body 1 and is located on one side of the threaded rod B41. The threaded rod B41 and the guide rod B42 both extend along the width direction of the box body 1. A plurality of nut seats B43 are equidistantly slidably mounted on the guide rod B42 and are all threadedly mounted on the threaded rod B41. Each nut seat B43 is close to the screen surface 2. A curved pipe 44 whose curvature matches the curvature of the screen surface 2 is fixed on one side, and a plurality of high-pressure nozzles 45 are arranged at intervals along the extension direction of each curved pipe 44 to ensure that the arrangement of the high-pressure nozzles 45 is sufficient to cover the extension length of the screen surface 2. A guide pipe 46 is also arranged in the box body 1, and one end of the guide pipe 46 extends to the outside of the box body 1 and is connected to the water storage tank. A plurality of connecting pipes 47 are evenly distributed on the guide pipe 46, and each connecting pipe 47 is respectively connected to the corresponding curved pipe 44, and a valve body 461 is also installed on the guide pipe 46.

[0045] The operation principle is the same as that of the moving scraper mechanism 3. The driving mechanism 5 drives the threaded rod B41 to rotate forward and reverse periodically, so that the thread drives the nut seat B43 to move back and forth. By adjusting the valve body 461 to the open state, the high-pressure pump in the water storage tank is used to pump the flushing water into the guide pipe 46, and the water is diverted and transported to each arc pipe 44 through each connecting pipe 47, and finally sprayed onto the screen surface 2 through each high-pressure nozzle 45, so as to realize the mobile flushing operation, flush out the material blocked in the screen gap 22, and realize the flushing and cleaning of the screen surface 2.

[0046] In addition, each high-pressure nozzle 45 is kept vertical to the corresponding position of the back of the screen surface 2, so that the water sprayed by the high-pressure nozzle 45 can effectively enter the screen gap 22 for effective flushing. Secondly, each connecting pipe 47 adopts a high-pressure resistant rubber hose, which can withstand high water pressure and has the ability to deform and bend, thereby being able to adapt to the position change of the arc pipe 44.

[0047] See also Figure 1 , Figure 6 , Figure 7 and Figure 8 The driving mechanism 5 includes a cylinder 51, a moving seat 52, a pair of sliding plate seats 53, a pair of racks 54 and a pair of gears 55. One end of the threaded rod A31 and the threaded rod B41 extend through the outside of the box body 1 and are fixedly installed with gears 55. The two sliding plate seats 53 are respectively movably mounted on the threaded rod A31 and the threaded rod B41 through the clearance grooves 531 provided thereon. Racks 54 are fixed on the two sliding plate seats 53. The two racks 54 are respectively meshed and connected with the corresponding gears 55. The cylinder 51 is connected to the mounting frame 5 11 is vertically fixed to the side of the box body 1, and a moving seat 52 is fixed on the end of the telescopic rod of the cylinder 51. Two sliding plate seats 53 are respectively connected to the two sides of the moving seat 52. The cylinder 51 is telescopic, which drives the moving seat 52 to move up and down, and then drives the sliding plate seats 53 on both sides to rise and fall synchronously. When the sliding plate seat 53 is lifted and lowered, it can drive the rack 54 to engage the gear 55 to rotate forward and reverse periodically, and then drive the threaded rod A31 and the threaded rod B41 to rotate respectively, providing drive for the mobile operation of pushing and scraping materials and flushing.

[0048] Specifically, a guide rail A521 and a pair of guide rails B532 are vertically fixed on the box body 1, and the moving seat 52 is slidably installed on the guide rail A521 to realize the limited sliding of the moving seat 52. Slide seats 533 are slidably installed on the two guide rails B532, and the two sliding plate seats 53 are respectively fixed on the corresponding sliding plate seats 53 to realize the limited sliding of the two sliding plate seats 53.

[0049] Mounting holes 501 are provided on both sides of the movable seat 52, and latch rods 504 are slidably installed in the mounting holes 501. A pair of guide grooves 502 are provided on the surfaces of the two movable seats 52, and the two guide grooves 502 are respectively communicated with the mounting holes 501 on the corresponding sides. A pinching handle 505 is fixed on the two latch rods 504, and the pinching handle 505 extends to the outside through the corresponding guide groove 502. A clamping hole 503 for the latch rod 504 to be inserted and connected is provided on the side close to each other of the two sliding plate seats 53. A magnet block 506 that can magnetically cooperate with the latch rod 504 is fixed on the inner end wall of the two clamping holes 503. By pinching the pinching handle 505 pushes the left latch rod 504 into the clamping hole 503 on the side of the left sliding plate seat 53, so as to realize the clamping of the moving seat 52 and the left sliding plate seat 53, and then the threaded rod B41 can be driven to rotate independently to realize the independent flushing mobile operation. At the same time, the right latch rod 504 is aligned and pushed into the clamping hole 503 on the right, and the threaded rod A31 can be driven to rotate independently to realize the independent scraping and pushing material operation. The two latch rods 504 are aligned and pushed into the corresponding clamping holes 503, which can drive the threaded rod A31 and the threaded rod B41 to rotate at the same time, so as to realize the simultaneous mobile operation of scraping and pushing materials and flushing.

[0050] By setting up a driving mechanism 5, drive can be provided for the flushing and scraping and pushing material actions. The two functions share the same drive, which reduces the investment in the driving equipment cost. The driving mechanism 5 and its supporting structure can effectively allocate the driving route, so that it can not only drive the mobile flushing operation separately, but also drive the mobile scraping and pushing operation separately, and can also drive the flushing and scraping and pushing material operations at the same time. It has complete functions, can select and switch functions according to needs, and is highly practical.

[0051] During the screening process, since fibers and fine residues are not easy to adhere to the front surface of the screen surface 2 due to the presence of moisture, when the screening is completed, some fibers and fine residues will be firmly adsorbed on the front side of the screen surface 2 after drying and are not easy to fall off. The present invention performs flushing and scraping and pushing materials at the same time. Scraping and pushing are performed simultaneously during flushing, so that the firmly adhered dry fibers and fine residues meet water, and combined with the scraping and pushing assistance of the scraper plate 34 and the scraper bar 35, it is ensured that the front side of the screen surface 2 can be effectively cleaned, thereby further improving the cleaning effect of the screen surface 2.

[0052] See also Figure 9-11The bottom of the nut seat A33 is fixed with a U-shaped seat 341, and a screw 342 is fixed on the U-shaped seat 341. A fastening nut 344 is set on the screw 342 with a matching thread. An adjustment plate 343 is set on the screw 342 between the side wall of the U-shaped seat 341 and the fastening nut 344. The screw 342 can be adjusted in the movable long groove 3431 on the adjustment plate 343. The scraper plates 34 are fixed on the adjustment plate 343 one by one. The fastening nut 344 is moved away from One side of the adjustment plate 343 is screwed and adjusted to cancel the squeezing and tightening of the adjustment plate 343. The height of the scraper plate 34 can be adjusted by utilizing the ability of the screw rod 342 and the movable long groove 3431 to be relatively movable and adjustable, so as to adjust the position of the scraped and pushed materials accordingly according to the actual height of the material accumulation. After the adjustment is completed, the fastening nut 344 is tightened to cooperate with the side wall of the U-shaped seat 341 to clamp and fix the adjustment plate 343 to ensure the stability of the scraper plate 34 when scraping and pushing materials.

[0053] In addition, the scraper plate 34 is detachably mounted on the adjustment plate 343. The detachable mounting method can use the existing technology, and the specific details will not be disclosed again. In addition, when the scraper plate 34 is severely worn, it is easy to replace.

[0054] The scraper strip 35 is a detachable and replaceable part. Each scraper strip 35 has an insertion arm 353. The side of each nut seat A33 is fixed with a mounting seat 351. The mounting seat 351 has an insertion groove 3511 for the insertion arm 353 to match and insert. The side of each mounting seat 351 is inserted with a fastening bolt 352 that can be screwed into the screw hole on the insertion arm 353. The insertion arm 353 is inserted into the insertion groove 3511, and the fastening bolt 352 is tightened in the screw hole on the insertion arm 353. The scraper strip 35 is installed, and at the same time, the scraper strip 35 and the insertion arm 353 are detachable and replaceable, which is convenient for replacement when the scraper strip 35 is severely worn.

[0055] In the process of corn starch processing, sulfurous acid is needed to soak corn particles. Therefore, the materials are highly acidic during the entire production process. In order to prevent the acid gas from escaping and polluting the air on site and affecting the health of the workers, the present invention has made the following improvements:

[0056] like Figure 2 and Figure 3 As shown, the rear side of the housing 1 is provided with an exhaust port 101 communicated with the interior of the housing 1. The exhaust port 101 is connected to the harmful waste gas treatment equipment through a pipeline. The exhaust device of the harmful waste gas treatment equipment works to extract the acid gas in the housing 1. In addition, the exhaust port 101 is arranged tilted upward, so tiny particles and water vapor are sucked onto the pipe wall of the exhaust port 101, and under the action of water vapor, combined with the tilt angle of the exhaust port 101, they can also flow back into the housing 1.

[0057] When the acid gas in the box 1 is extracted, the instantaneous pressure in the box 1 is unbalanced, and negative pressure is easily generated, resulting in poor fluidity of the material on the screen surface 2, affecting normal screening. In order to solve this problem, the box 1 of the present invention is provided with an air intake pipe 102 connected to the interior of the box 1 on the side away from the driving mechanism 5. When air is extracted, external air enters the box 1 through the air intake pipe 102 for replenishment, so as to maintain the dynamic balance of the air pressure in the box 1 and ensure that the screening can proceed normally. In addition, the port of the air intake pipe 102 faces downward, and a filter is installed in the air intake pipe 102 to prevent dust particles and other impurities from entering the box 1 and causing pollution.

[0058] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A new type of gravity screen box, characterized by: It comprises a box body (1) having a feeding portion (11) at the top and a discharging portion (12) at the bottom, and a screen surface (2) with an arc-shaped cross section installed inside the box body (1); The screen surface (2) is composed of a plurality of arranged screen wires (21), the cross section of the screen wires (21) is an isosceles trapezoid, the large side of the screen wires (21) faces forward and the small side faces backward; A screen gap (22) is formed between two adjacent screen wires (21) above and below, an inclination angle is provided between the two adjacent screen wires (21), and two R corners (23) on both sides of the large sides of the screen wires (21) are sharp corners; The R angle (23) forms a sharp cutting edge, which produces a better cutting effect when the material passes through the screen surface (2). The two adjacent screen wires (21) are arranged in a relatively staggered and inclined manner. The inclined and protruding R angle (23) can not only cut the material, but also intercept and guide the water and starch. A scraping mechanism (3) having a structure adapted to the shape of the screen surface (2) is provided in the box (1) at the front side of the screen surface (2), and the scraping mechanism (3) is used to scrape the front side of the screen surface (2); A flushing mechanism (4) having a structure adapted to the shape of the screen surface (2) is provided in the box (1) at the rear side of the screen surface (2), and the flushing mechanism (4) is used to flush and clean the screen gap (22) from the back to the front; A driving mechanism (5) for driving the scraping mechanism (3) and the flushing mechanism (4) to work so as to achieve mobile scraping and flushing cleaning is provided on one side of the box body (1); The scraper mechanism (3) comprises a threaded rod A (31), a guide rod A (32), a plurality of nut seats A (33), a scraper plate (34) and a scraper strip (35); The threaded rod A (31) is rotatably mounted in the box (1) and is located in front of the screen surface (2); the guide rod A (32) is fixed in the box (1) and is located on one side of the threaded rod A (31); the threaded rod A (31) and the guide rod A (32) both extend in the width direction of the box (1); A plurality of nut seats A (33) are equidistantly and slidably mounted on the guide rod A (32) along its length direction, and each of the nut seats A (33) is thread-matched and sleeved on the threaded rod A (31); The scraper plate (34) and the scraper strip (35) are mounted on each of the nut seats A (33), the scraper plate (34) and the scraper strip (35) are slidably fitted to the front surface of the screen surface (2), the bottom end of the scraper strip (35) is adjacent to the top end of the corresponding scraper plate (34), and the scraper strips (35) are arranged relatively tilted; The flushing mechanism (4) comprises a threaded rod B (41), a guide rod B (42), a plurality of nut seats B (43), an arc-shaped pipe (44) and a high-pressure nozzle (45); The threaded rod B (41) is rotatably mounted in the box (1) and is located at the rear side of the screen surface (2); the guide rod B (42) is fixed in the box (1) and is located at one side of the threaded rod B (41); the threaded rod B (41) and the guide rod B (42) both extend in the width direction of the box (1); A plurality of nut seats B (43) are equidistantly slidably mounted on the guide rod B (42), and are thread-matchedly mounted on the threaded rod B (41); A curved pipe (44) whose curvature matches the curvature of the screen surface (2) is fixed on one side of each nut seat B (43) close to the screen surface (2); a plurality of high-pressure nozzles (45) are arranged at intervals along the extending direction of each curved pipe (44); each high-pressure nozzle (45) is kept perpendicular to a corresponding position on the back of the screen surface (2); A flow guide pipe (46) is further provided in the box body (1), one end of the flow guide pipe (46) extends to the outside of the box body (1) and is connected to the water storage tank, a plurality of connecting pipes (47) are evenly distributed on the flow guide pipe (46), and each connecting pipe (47) is respectively connected to a corresponding arc-shaped pipe (44); Each of the connecting pipes (47) is made of a high-pressure resistant rubber hose, and a valve body (461) is also installed on the flow guide pipe (46).

2. A novel gravity screen box according to claim 1, characterized in that: The driving mechanism (5) comprises a cylinder (51), a moving seat (52), a pair of sliding plate seats (53), a pair of racks (54) and a pair of gears (55); One end of the threaded rod A (31) and one end of the threaded rod B (41) extend through the outside of the box body (1), and are fixedly mounted with the gear (55); The two sliding plate seats (53) are movably mounted on the threaded rod A (31) and the threaded rod B (41) respectively through the clearance grooves (531) provided thereon; The two sliding plate seats (53) are both fixed with the racks (54), and the two racks (54) are respectively meshed and connected with the corresponding gears (55); The cylinder (51) is vertically fixed to the side of the box body (1) via a mounting frame (511); the movable seat (52) is fixed to the end of the telescopic rod of the cylinder (51); and the two sliding plate seats (53) are respectively connected to two sides of the movable seat (52).

3. A novel gravity screen box according to claim 2, characterized in that: A guide rail A (521) and a pair of guide rails B (532) are vertically fixed on the box body (1); the movable seat (52) is slidably mounted on the guide rail A (521); a sliding seat (533) is slidably mounted on both guide rails B (532); and the two sliding plate seats (53) are respectively fixed on the corresponding sliding plate seats (53); Mounting holes (501) are respectively provided on both sides of the movable seat (52), and latch rods (504) are slidably installed in the mounting holes (501); A pair of guide grooves (502) are provided on the surfaces of the two movable seats (52), the two guide grooves (502) are respectively communicated with the mounting holes (501) on the corresponding sides, and a gripping handle (505) is fixed on each of the two latch rods (504), and the gripping handle (505) passes through the corresponding guide grooves (502) and extends to the outside; The two sliding plate seats (53) are each provided with a clamping hole (503) for the latch rod (504) to be inserted and connected with each other on one side close to each other; A magnet block (506) capable of magnetically engaging with the latch rod (504) is fixed on the inner end walls of the two latch holes (503).

4. A novel gravity screen box according to claim 1, characterized in that: A U-shaped seat (341) is fixed obliquely on the bottom of the nut seat A (33), a screw rod (342) is fixed on the U-shaped seat (341), and a fastening nut (344) is sleeved on the screw rod (342) in a thread-matched manner; An adjustment plate (343) is sleeved on the screw rod (342) between the side wall of the U-shaped seat (341) and the fastening nut (344), and the screw rod (342) can be movably adjusted in a movable long slot (3431) on the adjustment plate (343); The scraper plates (34) are fixed on the adjustment plates (343) in a one-to-one correspondence.

5. A novel gravity screen box according to claim 1, characterized in that: The scraper strips (35) are detachable and replaceable parts, and each scraper strip (35) is provided with an insertion arm (353); A mounting seat (351) is fixed to the side of each nut seat A (33), and each mounting seat (351) has an insertion slot (3511) for the insertion arm (353) to be matched and inserted; A fastening bolt (352) capable of being matched and screwed into a screw hole on the insertion arm (353) is inserted into the side of each mounting seat (351).

6. A novel gravity screen box according to claim 1, characterized in that: An air extraction port (101) communicating with the interior of the box (1) is provided on the rear side of the box (1), and an air intake pipe (102) communicating with the interior of the box (1) is provided on a side of the box (1) away from the driving mechanism (5); The air intake pipe (102) has a port facing downwards, and a filter is installed in the air intake pipe (102).

7. A novel gravity screen box according to claim 1, characterized in that: The feed portion (11) comprises a feed shell (111) and a feed pipe (112); the feed shell (111) is arranged on the top of the box body (1) and communicates with the inside of the box body (1); the feed pipe (112) is arranged on the rear side of the feed shell (111) and is used for feeding; The side of the feed shell (111) opposite to the feed pipe (112) is a curved flow guide portion (1101), and the bottom of the curved flow guide portion (1101) has a flow guide port (1102) whose flow guide direction is tangent to the screen surface (2); The discharge portion (12) comprises a discharge port A (121) and a discharge port B (122), wherein the discharge port A (121) is arranged at the bottom of the box body (1) in front of the screen surface (2), and the discharge port B (122) is arranged at the bottom of the box body (1) in rear of the screen surface (2).

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