A screening device for producing granular calcium stearate

Abstract

The invention discloses a screening device for producing granular calcium stearate, which relates to the technical field of chemical product production equipment. The device comprises a grid conveyor, wherein the grid conveyor is provided with an air separation mechanism, wherein the air separation mechanism comprises: an air blast assembly, which comprises a plurality of blowing units, wherein the area where the airflow emitted by each blowing unit contacts the grid conveyor belt transport section of the grid conveyor is a screening area; a powder collecting assembly, which comprises a negative pressure suction unit located above the grid conveyor belt transport section and a blanking and containing unit located below the grid conveyor belt transport section, wherein the negative pressure suction unit is used to suck the granular calcium stearate dust, and the blanking and containing unit is used to load the granular calcium stearate particles under the grid conveyor belt transport section. The invention provides the air separation mechanism on the grid conveyor, thereby preventing the intact granular calcium stearate from being broken by violent collision, thereby ensuring the yield of the calcium stearate particles after screening.

Description

Technical Field

[0001] The invention relates to the technical field of chemical product production equipment, in particular to a screening device for producing granular calcium stearate. Background Art

[0002] Calcium stearate, also known as calcium octadecanoate, is generally made by reacting stearic acid with calcium hydroxide or calcium oxide. It is usually in powder form. However, in actual applications, in order to effectively reduce dust pollution during packaging, transportation, and use, granular calcium stearate is used instead of powdered calcium stearate. In the actual production process, the granular calcium stearate particles need to be separated from the calcium stearate powder through a corresponding screening device.

[0003] Existing screening devices such as the Chinese patent publication number: CN103331255B, the name of the patent is "vibrating screen", which includes "a box body, a feed port is provided on the top of one end of the box body, a vibration motor is provided on the upper part of the box body, the vibration motor is connected to the screen frame provided inside the box body, a screen cover is provided on the box body between the vibration motor and the screen frame, the screen frame is a trapezoidal frame structure with an inclination, a larger upper part and a smaller lower part, a number of groups of screen tensioning devices are fixed on both ends of the screen frame from top to bottom, a number of intermediate beams corresponding to the several groups of screen tensioning devices are provided in the middle of the screen frame, screens are respectively provided between the screen tensioning device and the intermediate beams, a number of supporting beams are provided at the lower part of the screen, a discharge bin is provided at the bottom of the box body, and the screen holes of the upper screen are larger than the screen holes of the lower screen."

[0004] In practice, the screening method for granular calcium stearate products is mainly to remove unqualified small particles through a vibrating screen and a cyclone separator, thereby obtaining a granular calcium stearate product with high purity and uniform size. However, this method has the disadvantage that, since the existing production process of granular calcium stearate is to directly form particles after the reaction is completed in a reactor, the obtained calcium stearate product has a high moisture content, low particle density, and is easy to break. During the screening and vibration process of the vibrating screen, the intact granular calcium stearate is easily broken by violent collision, thereby reducing the yield of the calcium stearate particles after screening. Summary of the Invention

[0005] The object of the present invention is to provide a screening device for producing granular calcium stearate to overcome the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A screening device for producing granular calcium stearate, comprising a grid conveyor, wherein the grid conveyor is provided with an air separation mechanism, wherein the air separation mechanism comprises:

[0008] The air blowing assembly includes a plurality of air blowing units, and the area where the airflow emitted by each air blowing unit contacts the mesh conveyor belt material transport section of the mesh conveyor is the screening area;

[0009] The powder collection component includes a negative pressure suction unit located above the mesh conveyor belt material transport section and a blanking and containing unit located below the mesh conveyor belt material transport section. The negative pressure suction unit is used to suck the granular calcium stearate dust, and the blanking and containing unit is used to load the granular calcium stearate particles under the mesh conveyor belt material transport section.

[0010] Preferably, the grid conveyor belt of the grid conveyor has a portion parallel to the horizontal plane as a grid conveyor belt material transport section, and the top surface of the grid conveyor belt of the grid conveyor belt material transport section can contact with the granular calcium stearate during material transport.

[0011] Preferably, the blowing assembly further comprises a placement plate located below the conveying area section, each of the blowing units is mounted on the placement plate, and a plurality of height-adjustable support legs are mounted on the bottom of the placement plate.

[0012] Preferably, each of the blowing units may be a blower, and the air outlet of the blowing unit is directly opposite to the bottom surface of the grid conveyor belt in the conveying area section to form a screening area.

[0013] Preferably, the negative pressure suction unit includes a negative pressure air intake hood connected to the negative pressure generating device, and the hood opening of the negative pressure air intake hood is opposite to the screening area.

[0014] Preferably, a height limiting component is provided at the hood opening of the negative pressure air inlet hood, and the height limiting component includes a screen unit, and the screen unit can prevent the granular calcium stearate that meets the standard volume from jumping too high.

[0015] Preferably, the height-limiting assembly further comprises a mounting frame fixed to the hood opening of the negative pressure air intake hood, a plurality of cross bars being fixed on the mounting frame, and each of the cross bars being capable of supporting the screen unit in the mounting frame.

[0016] Preferably, the screen unit includes two plates, each of which is provided with a plurality of evenly distributed through holes, and each of the plates is hinged to a cross bar via a hinge.

[0017] Preferably, an active cavity is provided inside each of the plate bodies, and a regulating unit capable of changing the flow rate of the through-hole is provided in the active cavity.

[0018] Preferably, the control unit includes an inner frame, a plurality of sealing strips capable of partially covering the through hole are fixed inside the inner frame, the inner frame is connected to a connecting rope that movably passes through the movable cavity, and the protruding end of the connecting rope is fixed to the installation frame.

[0019] In the above technical solution, the present invention provides a screening device for the production of granular calcium stearate, which provides an air separation mechanism on the grid conveyor. The air flow generated by the blowing component in the running state blows the mesh conveyor belt of the grid conveyor to form a screening area, so that the granular calcium stearate in the screening area jumps upward, which is beneficial to separate the calcium stearate dust, the granular calcium stearate and the granular calcium stearate fragments, that is, the calcium stearate dust is absorbed by the negative pressure suction unit, and the granular calcium stearate fragments pass through the mesh conveyor belt of the grid conveyor and fall into the blanking holding unit, while the calcium stearate particles that meet the size standards on the mesh conveyor belt of the grid conveyor move out of the screening area as the grid conveyor runs. While achieving the screening effect, it is beneficial to avoid the situation where the intact granular calcium stearate is broken by violent collision, thereby ensuring the finished product rate of the calcium stearate particles after screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 This is an overall schematic diagram of a screening device for producing granular calcium stearate according to the present invention;

[0022] Figure 2 This is a schematic diagram of a height-limiting component of a screening device for producing granular calcium stearate according to the present invention above a material transport section of a mesh conveyor belt;

[0023] Figure 3 This is a schematic diagram of a roller cross-section of a screening device for producing granular calcium stearate according to the present invention;

[0024] Figure 4 This is a schematic cross-sectional view of a feeding pipe of a screening device for producing granular calcium stearate according to the present invention;

[0025] Figure 5 This is a schematic diagram of the position of the notch on the negative pressure air intake hood of a screening device for producing granular calcium stearate according to the present invention;

[0026] Figure 6 This is a schematic diagram of the position of the air blast component of a screening device for producing granular calcium stearate on a grid conveyor according to the present invention;

[0027] Figure 7 This is a schematic diagram of the flow area of ​​the through holes of a screening device for producing granular calcium stearate of the present invention when it is in the screening state:

[0028] Figure 8This is a schematic diagram of the flow area of ​​the through hole of a screening device for producing granular calcium stearate of the present invention when the through hole is in the expanded state:

[0029] Figure 9 This is a schematic diagram of a screening device for producing granular calcium stearate according to the present invention when the shaft is at the second angular position:

[0030] Figure 10 This is a schematic diagram of the position of the plate body of a screening device for producing granular calcium stearate in the installation frame of the present invention:

[0031] Figure 11 The present invention is a schematic diagram of a gate frame located inside a feeding pipe of a screening device for producing granular calcium stearate.

[0032] Description of reference numerals:

[0033] 1. Grid conveyor; 1.1. Grid conveyor belt transport section; 2. Blowing assembly; 2.1. Blowing unit; 2.2. Placement plate; 2.3. Support legs; 3. Powder collection assembly; 3.1. Negative pressure suction unit; 3.11. Negative pressure air intake hood; 3.2. Blanking material holding unit; 4. Height limit assembly; 4.1. Screen unit; 4.11. Plate body; 4.12. Through hole; 4.13. Hinge; 4.131. Sliding sleeve; 4.132. Hinge seat; 4.14. Movable cavity; 4.2. Mounting frame; 4.3. Horizontal Rod; 5. Control unit; 5.1. Inner frame; 5.2. Sealing strip; 5.3. Connecting rope; 6. Collection slot; 7. Spring; 8. Collection box; 9. Flexible rubber layer; 10. Reel; 11. Pull rope; 12. Feeding tube; 13. Door frame; 14. Roller; 15. Spike; 16. Side cross bar; 17. Long strip opening; 18. Gear; 19. Rack; 20. Shaft; 21. First tooth surface block; 22. Second tooth surface block; 24. Notch; 25. Blocking door; 26. Plug interface; 27. Elastic rope. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] See also Figure 1-11 The present invention provides a screening device for producing granular calcium stearate, comprising a grid conveyor 1, on which a wind separation mechanism is provided, the wind separation mechanism comprising:

[0036] The air blowing assembly 2 includes a plurality of air blowing units 2.1. The area where the airflow emitted by each air blowing unit 2.1 contacts the mesh conveyor belt material transport section of the mesh conveyor 1 is the screening area;

[0037] The powder collecting assembly 3 includes a negative pressure suction unit 3.1 located above the mesh conveyor belt conveyor section and a blanking and containing unit 3.2 located below the mesh conveyor belt conveyor section. The negative pressure suction unit 3.1 is used to suck the granular calcium stearate dust, and the blanking and containing unit 3.2 is used to load the granular calcium stearate particles below the mesh conveyor belt conveyor section.

[0038] The top of the mesh conveyor belt of the mesh conveyor 1 is the conveying surface, and the conveying surface is parallel to the horizontal ground. The mesh holes of the mesh conveyor belt of the mesh conveyor 1 act as a screen in the screening area, and can accept calcium stearate with a hole diameter smaller than that of the mesh holes of the mesh conveyor belt. Therefore, in actual use, the air flow generated by the blower assembly in the running state blows on the mesh conveyor belt of the mesh conveyor to form a screening area, so that the granular calcium stearate in the screening area jumps upward, which is conducive to removing calcium stearate dust and granular stearic acid. Calcium and crushed calcium stearate particles are separated, that is, the calcium stearate dust is absorbed by the negative pressure suction unit, and the crushed calcium stearate particles pass through the grid conveyor belt of the grid conveyor and fall into the blanking and containing unit, while the calcium stearate particles that meet the size standards on the grid conveyor belt of the grid conveyor are moved out of the screening area as the grid conveyor runs. This not only achieves a screening effect, but also helps to avoid the situation where the intact granular calcium stearate is broken by violent collision, thereby ensuring the finished product rate of the calcium stearate particles after screening;

[0039] The blanking holding unit 3.2 includes a collecting box 8 located in the annular grid conveyor belt ring of the grid conveyor 1. The box body of the collecting box 8 is fixed to the body of the grid conveyor 1 by a connecting piece. The opening of the collecting box 8 faces upward. The collecting box 8 can receive the calcium stearate particles falling on the entire conveying surface of the grid conveyor 1.

[0040] In another embodiment provided by the present invention, the grid conveyor belt of the grid conveyor 1 has a portion parallel to the horizontal plane, which is the grid conveyor belt material transport section 1.1. The top surface of the grid conveyor belt of the grid conveyor belt material transport section 1.1 can contact with the granular calcium stearate during conveying. Specifically, the grid conveyor belt has two mutual conveying section surfaces on the grid conveyor 1, and the two conveying section surfaces are parallel to the horizontal ground where they are located. There is sufficient placement space between the two conveying section surfaces, and the conveying section surface located above is the grid conveyor belt material transport section 1.1.

[0041] In another embodiment provided by the present invention, the blowing assembly 2 also includes a placement plate 2.2 located below the conveying area section 1.1, and each blowing unit 2.1 is installed on the placement plate 2.2. A plurality of height-adjustable support legs 2.3 are installed at the bottom of the placement plate 2.2. Specifically, the placement plate 2.2 is located between the two conveying section surfaces, and the plate surface of the placement plate 2.2 is parallel to the surface of the mesh conveyor belt transport section 1.1. Each blowing unit 2.1 is installed above the plate surface of the placement plate 2.2, so that the blowing unit 2.1 can blow upward from the bottom of the mesh conveyor belt transport section 1.1, so that the mesh conveyor belt transport section 1.1 It has an upward wind blowing force to form a screening area, wherein the support leg 2.3 is composed of a threaded rod fixed vertically to the bottom of the placement plate 2.2, and the inner bottom of the threaded rod is spirally sleeved with a threaded barrel, and the bottom end of the threaded barrel is rotatably connected to the collecting box 8. The outside of the threaded barrel is provided with anti-slip grooves. By rotating the threaded barrel, the insertion depth of the threaded rod in the inner threaded barrel is changed, thereby controlling the height of the support leg 2.3, and then realizing the regulation of the distance between the blowing unit 2.1 and the mesh conveyor belt transport section 1.1. The top surface of the placement plate 2.2 is an inclined surface, which is beneficial to prevent the accumulation of calcium stearate particles on the top surface of the placement plate 2.2.

[0042] In another embodiment provided by the present invention, each blowing unit 2.1 can be selected as a blower, and the air outlet of the blowing unit 2.1 is opposite to the bottom surface of the grid conveyor belt of the conveying area section 1.1 to form a screening area, and the air inlet of the blower is connected to the outside atmosphere through the air inlet pipe. The air outlet of the blower forms a screening area as a rectangular area surface on the grid conveyor belt of the conveying area section 1.1. Specifically, the air outlet of the blower is sleeved with an air outlet pipe with a rectangular cross-section, and the pipe mouth of the air outlet pipe is opposite to the bottom surface of the grid conveyor belt of the conveying area section 1.1. Furthermore, a flat-sliding door panel is installed on the pipe mouth of the air outlet pipe, and the area of ​​the screening area is indirectly changed by controlling the movement of the flat-sliding door panel.

[0043] In another embodiment provided by the present invention, the negative pressure suction unit 3.1 includes a negative pressure air intake hood 3.11 connected to the negative pressure generating device, the hood opening of the negative pressure air intake hood 3.11 faces downward, the hood opening of the negative pressure air intake hood 3.11 is rectangular in cross section, and the hood opening of the negative pressure air intake hood 3.11 is opposite to the screening area. The negative pressure airflow in the negative pressure air intake hood 3.11 causes the calcium stearate dust raised in the screening area to be sucked, and then the sucked dust is introduced into the cyclone separator screening equipment for further screening.

[0044] In another embodiment provided by the present invention, a height limiting component 4 is provided at the hood opening of the negative pressure air intake hood 3.11, and the height limiting component 4 includes a screen unit 4.1. The screen unit 4.1 can prevent the granular calcium stearate that meets the standard volume from jumping too high, wherein the screen unit 4.1 has two states, namely, a screening state and a venting state. The volume of particles allowed to pass through the screen unit 4.1 in the screening state is smaller than the volume of particles allowed to pass through the screen unit 4.1 in the venting state.

[0045] In another embodiment provided by the present invention, the height limiting assembly 4 also includes a mounting frame 4.2 fixed to the hood opening of the negative pressure air intake hood 3.11, and a plurality of cross bars 4.3 are fixed to the mounting frame 4.2, each cross bar 4.3 being capable of supporting the screen unit 4.1 in the mounting frame 4.2, wherein the rod body of each cross bar 4.3 is a cylindrical polished rod, and the cross bars 4.3 are parallel to each other, and the screen unit 4.1 includes two plates 4.11, each of which is provided with a plurality of evenly distributed through holes 4.12, and each plate 4.11 is hinged to the cross bar 4.3 by a hinge 4.13, and an active cavity 4.14 is provided inside each plate 4.11, and a control unit 5 capable of changing the flow rate of the through hole 4.12 is provided in the active cavity 4.14;

[0046] The ends of the two plates 4.11 are hinged by a hinge, and the two plates 4.11 constitute a symmetrically bendable deformable plate, wherein the end away from the hinge is the end of the deformable plate, the length direction line of the cross bar 4.3 is perpendicular to the moving direction of the grid conveyor belt of the conveying area section 1.1, the length direction of the deformable plate is consistent with the length direction of the cross bar 4.3, the movable cavity 4.14 is a rectangular cavity, and the inner wall surface of the rectangular cavity is parallel to the corresponding plate surface of the plate 4.11. In actual use, when the angle between the two plates 4.11 is 180, the screen unit 4.1 is in a screening state, and when the angle between the two plates 4.11 is less than 180, the screen unit 4.1 is in an expanded state. It should be noted that the screen unit 4.1 in the expanded state has an upwardly raised structure.

[0047] The through holes 4.12 are equilateral triangles in shape, and are arranged in a rectangular array on the plate 4.11. It should be noted that the base of the equilateral triangle is parallel to the end line of the plate 4.11, that is, the base of the equilateral triangle is parallel to the end line of the deformable plate. The sharp corners of the equilateral triangles on the two plates 4.11 point in the direction of the hinge between the two plates 4.11. The equilateral triangles on the deformable plate are mirror-symmetrical about the position where the hinge between the two plates 4.11 is hinged.

[0048] The hinged member 4.13 includes a sleeve 4.131 which is slidably connected to the cross bar 4.3. A hinge seat 4.132 which is hinged to the end of the deformation plate is installed on the sleeve body of the sleeve 4.131. In actual use, the sleeve 4.131 can slide along the cross bar 4.3 according to the state change of the screen unit 4.1. Specifically, when the screen unit 4.1 is converted to the reaming state, the sleeve 4.131 slides toward the midpoint of the cross bar 4.3. When the screen unit 4.1 is converted to the screening state, the sleeve 4.131 slides toward the end point of the cross bar 4.3.

[0049] In another embodiment provided by the present invention, long collecting troughs 6 are fixed on both sides of the body of the grid conveyor 1, and the length direction of the long collecting troughs 6 is parallel to the length direction of the grid conveyor 1. The trough body of the long collecting trough 6 can receive the calcium stearate particles that slide down from the screen unit 4.1.

[0050] In another embodiment provided by the present invention, the control unit 5 includes an inner frame 5.1, a plurality of blocking strips 5.2 that can partially cover the through hole 4.12 are fixed inside the inner frame 5.1, and the inner frame 5.1 is connected to a connecting rope 5.3 that can movably pass through the active cavity 4.14. The number of the connecting ropes 5.3 is multiple, and the protruding end of the connecting rope 5.3 is fixed to the installation frame 4.2, and the end of the connecting rope 5.3 located in the active cavity 4.14 is fixed to the inner frame 5.1. Specifically, the length direction of the blocking strip 5.2 is parallel to the end line of the plate body 4.11, and the blocking strip 5 .2 can contact the cavity wall of the active cavity 4.14 having the through-hole 4.12. The inner frame 5.1 is a rectangular frame. The inner frame 5.1 can move back and forth in a straight line in the longitudinal direction of the active cavity 4.14. The longitudinal direction line of the active cavity 4.14 is parallel to the line between the end of the plate 4.11 and the hinge end of the plate 4.11. Preferably, the inner frame 5.1 and the wall of the active cavity 4.14 are connected by a spring 7 through which a connecting rope 5.3 passes. Among them, the blocking strip 5.2 can partially cover the same area of ​​the through-holes 4.12 on the same row;

[0051] In actual use, when the angle between the two plates 4.11 is 180 degrees, the coverage of the through hole 4.12 by the blocking strip 5.2 is at its maximum state. At this time, the aperture of the through hole 4.12 is at its minimum state, that is, the flow rate of the through hole 4.12 is at its minimum. It can only allow small calcium stearate particles, calcium stearate dust and the air flow generated by the blower to pass through, and has a blocking effect on larger calcium stearate particles. At the same time, the spring 7 is also in a naturally expanded state. When a large number of through holes 4.12 in the minimum state are blocked, At this time, the air permeability of the two plates 4.11 is weakened. At this time, part of the airflow will form an upward thrust on the bottom of the plate 4.11, causing the hinge between the two plates 4.11 to bulge upward, thereby reducing the angle between the two plates 4.11 to less than 180 degrees. During this process, the screen unit 4.1 is converted from a screening state to a hole expansion state, increasing the hole diameter, allowing the obstruction in the through hole 4.12 to be dislodged. At this time, the air permeability of the two plates 4.11 is restored, and under the action of gravity, the angle between the two plates 4.11 returns to 180 degrees.

[0052] In addition, the hinge joint between the two plates 4.11 is covered with a flexible rubber layer 9, the side edges of which are fixed to the plates 4.11, thereby preventing air leakage caused by the gap between the two plates 4.11, improving the integrity of the deformable plate, and making the deformable plate have an excellent barrier effect in screening calcium stearate particles.

[0053] It should be further explained that, during the upward bulging of the hinge joint between the two plates 4.11, the sliding sleeve 4.131 slides toward the midpoint of the cross bar 4.3, and the inner frame 5.1 cannot move with the plate 4.11 under the action of the connecting rope 5.3, thereby causing the inner frame 5.1 and the blocking strip 5.2 to undergo relative displacement in the active cavity 4.14, and the spring 7 to undergo elastic deformation, thereby reducing the coverage area of ​​the blocking strip 5.2 on the through hole 4.12, thereby increasing the actual flow aperture of the through hole 4.12. Similarly, when the angle between the two plates 4.11 is restored to 180 degrees, under the action of the elastic restoring force of the spring 7, the inner frame 5.1 and the blocking strip 5.2 undergo relative recovery displacement in the active cavity 4.14, and the coverage area of ​​the blocking strip 5.2 on the through hole 4.12 is restored to its initial position.

[0054] In another embodiment provided by the present invention, a reel 10 is rotatably mounted in the negative pressure air inlet hood 3.11, and a pull rope 11 is wound around the reel 10. One end of the pull rope 11 is connected to the end of the plate 4.11 where the hinge is mounted. When the reel 10 rotates forward to reel in the pull rope 11, the pull rope 11 exerts an upward pulling force on the middle portion of the deformable plate, which helps to cause the hinge joint between the two plates 4.11 to bulge upward, thereby facilitating the transition of the screen unit 4.1 from a screening state to a hole-expanding state.

[0055] A feeding pipe 12 is provided on one side of the negative pressure air intake hood 3.11, which is perpendicular to the conveying surface at the top of the grid conveyor 1. The cross section of the feeding pipe 12 is rectangular, and the outer side surface of the feeding pipe 12 is parallel to the outer side surface of the negative pressure air intake hood 3.11. A door frame 13 is provided inside the feeding pipe 12, and a roller 14 is rotatably installed at the bottom of the door frame 13. The cross section of the roller 14 is a cam structure, and a plurality of thorns 15 are fixed on the roller 14. The roller 14 can rotate when it contacts the grid conveyor belt of the grid conveyor 1, and at the same time, each thorn 15 can be inserted into the grid holes on the grid conveyor belt it contacts, thereby squeezing out the calcium stearate particles in the grid holes on the grid conveyor belt, and keeping the grid conveyor belt in the screening area. It has good ventilation and also plays an anti-slip effect on the roller 14 on the grid conveyor belt of the grid conveyor 1, and the extruded calcium stearate particles also fall into the blanking holding unit 3.2 under the action of gravity. During the rotation of the roller 14, the door frame 13 makes a reciprocating motion in the vertical direction in the feeding pipe 12. The side of the door frame 13 is fixed with a side cross bar 16. The length direction of the side cross bar 16 is parallel to the movement direction of the grid conveyor belt at the top of the grid conveyor 1. The side cross bar 16 makes a reciprocating motion in the vertical direction in the feeding pipe 12 with the door frame 13, which is conducive to the calcium stearate to be screened in the feeding pipe 12 falling on the grid conveyor belt of the grid conveyor 1, ensuring smooth discharge of the feeding pipe 12.

[0056] In another embodiment provided by the present invention, a vertical long strip opening 17 is opened on the side of the feeding pipe 12 close to the negative pressure air intake hood 3.11, one end of the side cross bar 16 extends out of the long strip opening 17, and the end of the reel 10 close to the feeding pipe 12 extends out of the negative pressure air intake hood 3.11. A gear 18 is fixed to the end of the reel 10 extending out of the negative pressure air intake hood 3.11, and a vertical rack 19 is fixed to the end of the side cross bar 16 extending out of the long strip opening 17. The tooth surface of the rack 19 faces the meshing tooth surface of the gear 18. A shaft 20 perpendicular to the horizontal plane is provided between the rack 19 and the gear 18. A first tooth surface block 21 capable of meshing with the rack 19 is fixed on one side of the shaft 20. The shaft 2 0 is fixed on the other side thereof with a second tooth surface block 22 that can mesh with the gear 18. When the shaft is axially rotated to the first angular position, the rack 19 is meshed with the first tooth surface block 21, and the gear 18 is meshed with the second tooth surface block 22. Similarly, when the shaft is axially rotated to the second angular position, the rack 19 is separated from the first tooth surface block 21. At this time, the gear 18 is separated from the second tooth surface block 22. The shaft 20 rotates from the first angular position to the second angular position. The shaft 20 needs to rotate forward in the range of 20 degrees to 60 degrees. Preferably, the shaft 20 needs to rotate forward 30 degrees. When the shaft 20 rotates from the second angular position to the first angular position, the shaft 20 needs to rotate reversely 30 degrees.

[0057] When the shaft axially rotates to the first angular position, the shaft 20 can reciprocate synchronously with the rack 19 in the vertical direction. At the same time, the second tooth surface block 22 causes the gear 18 to drive the reel 10 to deflect. Specifically, when the rack 19 moves upward, the reel 10 rotates forward to reel in the pulling rope 11. When the rack 19 moves downward, the reel 10 rotates forward to release the pulling rope 11. When the shaft axially rotates to the second angular position, the movement of the rack 19 no longer transmits the rotation of the reel 10.

[0058] A notch 24 is provided on the side of the negative pressure air intake hood 3.11 close to the feeding pipe 12, and a blocking door 25 is movably hinged on the outer side of the notch 24. The end of the blocking door 25 away from the hinge is connected to the notch 24 by an elastic rope 27. The switching mode of the blocking door 25 is a flat opening type. A plug interface 26 is fixed to the top surface of the blocking door 25. The center line of the aperture of the plug interface 26 coincides with the hinge center of the blocking door 25. The diameter cross section of the plug interface 26 is rectangular, and the cross section of the shaft rod 20 is rectangular. The shaft rod 20 is adapted to the plug interface 26, and the shaft rod 20 can move axially in the plug interface 26. In actual use, when the air permeability of the two plate bodies 4.11 is weakened, part of the airflow will form an upward thrust on the bottom of the plate body 4.11. When the number of blockages in the through holes 4.12 in the minimum state is large, the airflow will not be able to move to the plate body 4.11. .11 The force at the bottom cannot cause the plate body 4.11 to change its position, that is, the middle part of the deformable plate does not bulge upward. At this time, the other part of the airflow will flow toward the edge of the deformable plate. At this time, the blocking door 25 located at the edge of the deformable plate is positively offset by the airflow, thereby causing the shaft 20 to rotate from the second angle position to the first angle position, and the elastic rope 27 is deformed. When the air permeability of the two plate bodies 4.11 is restored, the force of the airflow on the blocking door 25 is reduced. Under the elastic restoring force of the elastic rope 27, the blocking door 25 returns to its initial closed position, and the shaft also rotates axially to the second angle position along with the blocking door 25. In this process, it provides assistance for the deformation process of the middle part of the deformable plate, which is conducive to the smooth conversion of the screen unit 4.1 from the screening state to the hole expansion state.

[0059] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A screening device for producing granular calcium stearate, comprising a grid conveyor (1), characterized in that: The grid conveyor (1) is provided with an air separation mechanism, and the air separation mechanism comprises: An air blowing assembly (2) comprising a plurality of air blowing units (2.1), wherein the area where the airflow emitted by each of the air blowing units (2.1) contacts the mesh conveyor belt material transport section of the mesh conveyor (1) serves as a screening area; A powder collecting assembly (3) comprises a negative pressure suction unit (3.1) located above the mesh conveyor belt conveyor section and a blanking and containing unit (3.2) located below the mesh conveyor belt conveyor section, wherein the negative pressure suction unit (3.1) is used to suck the granular calcium stearate dust, and the blanking and containing unit (3.2) is used to load the granular calcium stearate particles below the mesh conveyor belt conveyor section; The negative pressure suction unit (3.1) includes a negative pressure air intake hood (3.11) connected to a negative pressure generating device, the hood opening of the negative pressure air intake hood (3.11) is directly opposite to the screening area, and a height limiting component (4) is provided at the hood opening of the negative pressure air intake hood (3.11), the height limiting component (4) includes a screen unit (4.1), and the screen unit (4.1) can prevent granular calcium stearate meeting a standard volume from jumping too high; The height-limiting assembly (4) further comprises a mounting frame (4.2) fixed to a hood opening of the negative pressure air intake hood (3.11); a plurality of crossbars (4.3) are fixed to the mounting frame (4.2); each crossbar (4.3) is capable of supporting a screen unit (4.1) within the mounting frame (4.2); The screen unit (4.1) comprises two plates (4.11), each of which is provided with a plurality of evenly distributed through holes (4.12), each of which is hingedly connected to a crossbar (4.3) via a hinge (4.13), and each of which is provided with an active cavity (4.14) inside, wherein a control unit (5) capable of changing the flow rate of the through holes (4.12) is provided in the active cavity (4.14); The control unit (5) comprises an inner frame (5.1), a plurality of blocking strips (5.2) capable of partially covering the through hole (4.12) being fixed inside the inner frame (5.1), the inner frame (5.1) being connected to a connecting rope (5.3) that movably passes through the movable cavity (4.14), the protruding end of the connecting rope (5.3) being fixed to the mounting frame (4.2).

2. A screening device for producing granular calcium stearate according to claim 1, characterized in that: The grid conveyor belt of the grid conveyor (1) has a portion parallel to the horizontal plane as a grid conveyor belt material transport section (1.1), and the top surface of the grid conveyor belt of the grid conveyor belt material transport section (1.1) can contact with granular calcium stearate during material transport.

3. A screening device for producing granular calcium stearate according to claim 2, characterized in that: The blowing assembly (2) further comprises a placement plate (2.2) located below the conveying area section (1.1), each blowing unit (2.1) is mounted on the placement plate (2.2), and a plurality of height-adjustable support legs (2.3) are mounted on the bottom of the placement plate (2.2).

4. A screening device for producing granular calcium stearate according to claim 3, characterized in that: Each of the blowing units (2.1) can be selected as a blower, and the air outlet of the blowing unit (2.1) is directly opposite to the bottom surface of the grid conveyor belt of the conveying area section (1.1) to form a screening area.

Images