A water-soluble fertilizer processing device and its processing method

Abstract

This invention relates to a water-soluble fertilizer processing device and its processing method, belonging to the technical field of water-soluble fertilizer screening machines. A water-soluble fertilizer processing device includes: a screening machine body, a screening seat, a main screen plate, multiple auxiliary screens, multiple limiting rings, a pushing component, and a driving component. The screening seat is installed inside the screening body; there is a receiving space between the screening seat and the main screen plate, and the main screen plate has multiple adjustable screen holes; multiple auxiliary screens are slidably arranged relative to the main screen plate, and each auxiliary screen has multiple second screen holes corresponding to the screen holes, the size of the screen holes being changed by changing the position of the multiple second screen holes; guide grooves are provided on both the limiting rings and the screening seat, and the auxiliary screens are slidably installed in the guide grooves accordingly; the pushing component is driven by the driving component, rotating the driving component pushes the auxiliary screens to slide along the guide grooves; the driving component is rotatably installed on the main screen plate, and the driving component abuts against the inner wall of the rotating groove, and is driven by the pushing component. This invention addresses the technical problems in existing technologies where the bolt-fitting method for replacing screen plates is not convenient enough, cannot meet the requirements for rapid replacement and disassembly of screen plates, the process of changing the size of the screening aperture is too cumbersome, it is not conducive to rapid adjustment between different complex processes, and it cannot handle the byproducts generated during processing in a timely manner.

Description

Technical Field

[0001] This invention belongs to the technical field of water-soluble fertilizer screening machines, and specifically relates to a water-soluble fertilizer processing device and its processing method. Background Technology

[0002] Water-soluble fertilizers are compound fertilizers containing nitrogen, phosphorus, potassium, calcium, magnesium, trace elements, amino acids, humic acid, alginic acid, etc., that can completely dissolve in water. They are classified into solid and liquid water-soluble fertilizers based on their form. Based on nutrient content, they are categorized into macro-element water-soluble fertilizers, meso-element water-soluble fertilizers, micro-element water-soluble fertilizers, amino acid-containing water-soluble fertilizers, humic acid-containing water-soluble fertilizers, and organic water-soluble fertilizers, among others. The production process of water-soluble fertilizers requires crushing and screening raw materials. Since the raw materials are diverse, friction and impact between materials during processing can accelerate the volatilization of harmful substances or odors. Furthermore, the equipment generates some dust after processing, which may have some impact on the health of workers.

[0003] A search revealed that the authorized publication number "CN215997537U" discloses "a screening device for the production and processing of water-soluble fertilizers, including a water-soluble fertilizer screening machine. The connecting end of the water-soluble fertilizer screening machine has symmetrically formed grooves. A limiting screw is installed inside the groove. The top of the connecting end of the water-soluble fertilizer screening machine has symmetrically formed guide grooves relative to the two sides of the grooves. Guide blocks are symmetrically fixed to the top and bottom of the limiting screws. The guide blocks are engaged with the guide grooves. A gasket is fitted onto the surface of the limiting screw, and a nut is screwed onto the side of the limiting screw opposite to the gasket."

[0004] This invention utilizes a designed limiting screw to allow for easy replacement of the screening screen inside the water-soluble fertilizer screening machine when the screen needs to be replaced. The limiting screw and groove release the machine's restriction, facilitating the convenient replacement of screens with different aperture sizes.

[0005] The aforementioned devices, representing existing technologies, have at least the following problems when processing water-soluble fertilizers:

[0006] Replacing the screen plate with bolts is not convenient enough, and it cannot meet the requirements for quick replacement and disassembly of the screen plate. Changing the size of the screening aperture is too cumbersome, which is not conducive to quick adjustment between different complex processes, and it cannot handle the byproducts generated during processing in a timely manner. Summary of the Invention

[0007] This invention provides a water-soluble fertilizer processing device and its processing method, which solves the technical problems in the prior art where the use of bolts to replace the screen plate is not convenient enough, cannot meet the requirements for rapid replacement and disassembly of the screen plate, the process of changing the size of the screening aperture is too cumbersome, is not conducive to rapid adjustment between different complex processes, and cannot promptly deal with the byproducts generated during processing.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0009] A water-soluble fertilizer processing device includes: a screening machine body, a screening base, a main screen plate, multiple auxiliary screens, multiple limiting rings, a pushing component, and a driving component. The screening base is installed inside the screening body; the main screen plate has an annular rotating groove on its upper surface along the circumference; there is a receiving space between the screening base and the main screen plate, and the main screen plate has multiple adjustable screen holes; multiple auxiliary screens are slidably installed in the receiving space, and the multiple auxiliary screens are slidably arranged relative to the main screen plate along different preset directions, and each auxiliary screen has multiple second screen holes corresponding to the screen holes, forming a passage gap between the screen holes and the second screen holes; the size of the passage gap is changed by changing the position of the multiple second screen holes; multiple limiting rings are provided on the screening base. The system has multiple first positioning holes, and multiple limiting rings each have multiple second positioning holes circumferentially. Guide grooves are provided on the multiple limiting rings and the screening seat. The auxiliary screen is installed in the guide groove and abuts against the inner sidewall of the guide groove. A pushing member is rotatably mounted on the sidewall of the guide groove and is drive-connected to the driving member. Rotating the driving member pushes it to abut against the outer wall of the auxiliary screen, thereby pushing the auxiliary screen to slide along the guide groove. The driving member is rotatably mounted on the main screen plate and abuts against the inner wall of the rotating groove, and is drive-connected to the pushing member.

[0010] Furthermore, the main screen plate is provided with multiple guide grooves, the secondary screen is provided with mounting grooves corresponding to the guide grooves, and each secondary screen is provided with a guide block. The guide block is used to engage in the guide groove, or to pass through the mounting groove and engage in the guide groove, in order to limit the sliding direction of the secondary screen.

[0011] Furthermore, a connecting rod is rotatably provided on the pushing member. One end of the connecting rod is rotatably disposed on the pushing member, and the other end of the connecting rod is rotatably connected to the inner wall of the driving member. Rotating the driving member drives one end of the connecting rod to move along the rotation direction of the driving member, thereby driving the pushing member to rotate relative to the guide groove, thereby pushing the auxiliary screen to slide.

[0012] Furthermore, the driving component is mounted on the screening seat, and multiple auxiliary screens are stacked sequentially along the central axis of the main screen plate. The driving component rotates to drive the pushing component to push the multiple auxiliary screens to slide along the corresponding preset direction, thereby changing the positional relationship between the multiple auxiliary screens and the main screen plate, so as to change the size of the through gap.

[0013] Furthermore, it also includes: an elastic element and a support plate. The elastic element is installed in the guide groove to reset the sliding of the secondary screen; the support plate is installed at the bottom of the screening base to support the secondary screen installed on the screening base.

[0014] Furthermore, it also includes: an electrostatic precipitator and a ventilation device. The electrostatic precipitator is installed on the main body of the screening machine; the ventilation device is connected to the interior of the main body of the screening machine and is used to collect and discharge the gases generated during the production of the equipment.

[0015] A processing method includes the following steps:

[0016] Step 1: When it is necessary to change the sieve aperture, rotate the drive component to drive the connecting rod to move and abut against the auxiliary sieve.

[0017] Step 2: The guide block slides along the guide groove to drive the sub-screen to move along the preset direction of its own guide groove. The sub-screens of multiple different layers slide relative to the main screen plate simultaneously under the action of the driving component.

[0018] Step 3: The multiple second sieve holes are offset relative to the first sieve holes, thereby changing the size of the through gap and thus changing the sieve aperture.

[0019] This invention provides a water-soluble fertilizer processing device and method, with the following advantages:

[0020] 1. The present invention directly adjusts the size of the screen holes of the main screen plate by setting a pushing component in the main body of the screening machine, thereby reducing the replacement operation of filter plates of different mesh sizes through various means of disassembly and assembly, and thus improving the efficiency of the device.

[0021] 2. The present invention converts the rotation of the driving component into the sliding of multiple auxiliary screens within the limiting ring, thereby changing the passage gap and thus changing the aperture size of the main screen plate, thereby improving the adjustment efficiency.

[0022] 3. The present invention enables multiple auxiliary screens to move along the guide groove by setting the mounting groove and the guide block, thereby reducing interference between components. By setting the elastic element, a reset force is applied to the auxiliary screen, thus improving the reliability and stability of screen hole size control.

[0023] 4. The present invention treats the dust and odor generated in the device by means of the electrostatic precipitator and the ventilation device, thereby reducing the pollution caused by the production process. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a water-soluble fertilizer processing device provided in an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the installation structure of the pusher, drive, and main screen plate provided in an embodiment of the present invention;

[0027] Figure 3 for Figure 2 Schematic diagram of the bottom structure of the middle structure;

[0028] Figure 4 for Figure 2 Exploded view of the middle structure;

[0029] Figure 5 for Figure 4 Enlarged diagram in the image;

[0030] Figure 6 A schematic diagram of the back of the main sieve plate provided in an embodiment of the present invention;

[0031] Figure 7 for Figure 2 A cross-sectional view of the structure.

[0032] In the picture:

[0033] 10-Screening machine body; 20-Screening seat; 201-Main screen plate; 202-Rotating groove; 203-Screen hole; 40-Drive component; 301-Secondary screen; 302-Second screen hole; 303-Limiting ring; 304-First positioning hole; 305-Second positioning hole; 306-Guide groove; 307-Push component; 308-Guide groove; 309-Mounting groove; 310-Guide block; 311-Connecting rod; 312-Elastic element; 313-Support plate. Detailed Implementation

[0034] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0035] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] Example:

[0039] Please refer to Figures 1 to 7As shown, this embodiment provides a water-soluble fertilizer processing device, including: a screening machine body 10, a screening seat 20, a main screen plate 201, multiple auxiliary screens 301, multiple limiting rings 303, a pushing component 307, and a driving component 40. The screening seat 20 is installed inside the screening body; the upper surface of the main screen plate 201 has an annular rotating groove 202 along the circumferential direction, and there is a receiving space between the screening seat 20 and the main screen plate 201, and the main screen plate 201 has multiple screen holes 203 of adjustable size; multiple auxiliary screens 301 are slidably installed in the receiving space, and the multiple auxiliary screens 301 are slidably arranged relative to the main screen plate 201 along different preset directions, and multiple second screen holes 302 corresponding to the screen holes 203 are opened on the auxiliary screens 301, and a passage gap is formed between the screen holes 203 and the second screen holes 302, and the size of the passage gap is changed by the position change of the multiple second screen holes 302; multiple limiting rings 303 are opened on the screening seat 20. A positioning hole 304 is provided, and multiple limiting rings 303 are provided with multiple second positioning holes 305 along the circumferential direction. Multiple limiting rings 303 and screening seat 20 are provided with guide grooves 306. The auxiliary screen 301 is installed in the guide groove 306 and abuts against the inner side wall of the guide groove 306. The pushing member 307 is rotatably installed on the side wall of the guide groove 306 and is connected to the driving member 40. Rotating the driving member 40 pushes the pushing member 307 to abut against the outer wall of the auxiliary screen 301, thereby pushing the auxiliary screen 301 to slide along the guide groove 306. The driving member 40 is rotatably installed on the main screen plate 201 and abuts against the inner wall of the rotating groove 202 and is connected to the pushing member 307.

[0040] In this embodiment, as Figures 1 to 7As shown, the screening machine body is equipped with multiple screening structures. Each main screen plate 201 is equipped with at least three auxiliary screens 301, and correspondingly, at least two limiting rings 303 and one screening seat 20 should be provided. The screening seat 20 and the limiting rings 303 are respectively provided with guide grooves 306 in three preset directions. The included angles between the three preset directions are the same. Taking the three auxiliary screens 301 as an example, the included angle between every two linear motion trajectories of the three auxiliary screens 301 is 60°. Through the rotation of multiple auxiliary screens 301 in different directions, the second screen hole 302 is offset relative to the central axis of the screen hole 203, thereby changing the size of the passage gap to quickly... It can quickly adapt to multiple screening sizes, and a positioning pin hole is opened on the side wall of the drive component 40. The positioning pin is installed by thread, and the positioning pin passes through the drive component 40 and abuts against the outer side wall of the screening seat 20, thereby fixing the relative position between the drive component 40 and the screening seat 20 and fixing the size of the gap. This improves the stability and reliability after changing the screening size of the screen hole 203. Moreover, by rotating the drive component 40, the size of the screen hole 203 can be continuously changed, which reduces the limitation of the screening size in the traditional process to a certain extent on the design size of the screen, and improves the adaptability of the device to different process designs.

[0041] Furthermore, in some implementations of this embodiment, such as Figures 3 to 6 As shown, the main screen plate 201 has multiple guide grooves 308, and the secondary screen 301 has mounting grooves 309 corresponding to the guide grooves 308. Each secondary screen 301 has a guide block 310, which is used to engage in the guide groove 308 or to engage in the guide groove 308 after passing through the mounting groove 309, in order to limit the sliding direction of the secondary screen 301.

[0042] In this embodiment, as Figure 6 As shown, the guide groove 308 has multiple design directions, including at least three design directions: a first preset direction, a second preset direction, and a third preset direction. The included angle between the three preset directions is 60°. Multiple auxiliary screens 301 are arranged from top to bottom as a first screen, a second screen, and a third screen. The first screen moves along the first preset direction, and multiple guide blocks 310 of the first screen are slidably installed within the guide groove 308 along the first preset direction. Similarly, the guide blocks 310 on the second and third screens are respectively installed within the guide grooves 308 along the second and third preset directions. The first and second screens have mounting grooves 309. The mounting groove 309 on the first screen is used to pass through the guide blocks 310 on the second and third screens; the mounting groove 309 on the second screen is used to pass through the guide blocks 310 on the third screen. The mounting grooves 309 improve the reliability of the installation between the guide blocks 310 on the lower screen and the guide grooves 308 on the main screen plate 201.

[0043] Furthermore, in some implementations of this embodiment, such as Figures 2 to 7 As shown, a connecting rod portion 311 is rotatably disposed on the pusher 307. One end of the connecting rod portion 311 is rotatably disposed on the pusher 307, and the other end of the connecting rod portion 311 is rotatably connected to the inner wall of the drive member 40. When the drive member 40 is rotated, one end of the connecting rod portion 311 is driven to move along the rotation direction of the drive member 40, thereby driving the pusher 307 to rotate relative to the guide groove 306, thereby pushing the auxiliary screen 301 to slide.

[0044] In this embodiment, as Figure 7 As shown, one end of the push rod is rotatably mounted on the guide groove 306. The limiting ring 303 has an opening for the sliding of the connecting rod 311. The inner wall of the drive member 40 has a positioning structure corresponding to the connecting rod 311 of each layer, which is used to install the connecting rod 311. When the drive member 40 is rotated, one end of the connecting rod 311 rotates along the circumference of the drive member 40 with the positioning structure. Because the position of the limiting ring 303 is fixed, the connecting rod 311 drives the other end of the push rod to approach the auxiliary screen 301.

[0045] Furthermore, in some implementations of this embodiment, such as Figures 2 to 7 As shown, the driving component 40 is mounted on the screening base 20. Multiple auxiliary screens 301 are stacked sequentially along the central axis of the main screen plate 201. The driving component 40 drives the pushing component 307 to push the multiple auxiliary screens 301 to slide along the corresponding preset direction by rotating, thereby changing the positional relationship between the multiple auxiliary screens 301 and the main screen plate 201, so as to change the size of the gap.

[0046] In this embodiment, as Figure 4 As shown, the components are installed sequentially from top to bottom. The drive component 40 is a ring-shaped component. Then, the main screen plate 201, the first screen and the limiting ring 303, the second screen and the limiting ring 303 are installed sequentially, and their respective connecting rods 311 are inserted into the positioning structure. Finally, the third screen and the screening seat 20 are installed. Finally, the screening seat 20 is connected to the other limiting rings 303 through the first positioning hole 304 and the second positioning hole 305.

[0047] Furthermore, in some implementations of this embodiment, such as Figure 4 and Figure 7 As shown, it also includes: an elastic element 312 and a support plate 313. The elastic element 312 is installed in the guide groove 306 and is used to reset the sliding of the auxiliary screen 301; the support plate 313 is installed at the bottom of the screening base 20 and is used to support the auxiliary screen 301 installed on the screening base 20.

[0048] In this embodiment, as Figure 7As shown, the elastic element 312 can be a spring, which is installed between the inner wall of the limiting ring 303 and the outer wall of the auxiliary screen 301. Figure 4 As shown, the support plate 313 can specifically be two wing plates, which are installed inside the screening seat 20 to prevent the auxiliary screen 301 from detaching from the screening seat 20 and improve the overall reliability of the device.

[0049] Furthermore, in some embodiments of this example, an electrostatic precipitator and a ventilation device are also included. The electrostatic precipitator is installed on the screening machine body 10; the ventilation device is connected to the interior of the screening machine body 10 and is used to collect and discharge the gas generated during equipment production.

[0050] In this embodiment, a ventilation system is provided on the main body 10 of the screening machine to collect and treat floating dust and odors in the space inside the equipment cavity. The system also uses electrostatic dust removal to adsorb and collect charged floating dust, preventing the floating dust generated during the production process from clumping inside the equipment, which would affect the normal use of the equipment and the cost of cleaning and maintenance. In addition, the ventilation system also treats the gas generated during the vibration and collision of the raw materials to prevent further impact on the environment.

[0051] A processing method includes the following steps:

[0052] 1. When it is necessary to change the sieve aperture, rotate the drive component 40 to drive the connecting rod part 311 to move and abut against the auxiliary screen 301.

[0053] 2. The guide block 310 slides along the guide groove 308 to drive the auxiliary screen 301 to move along the preset direction of its own guide groove 306. Multiple auxiliary screens 301 in different layers slide relative to the main screen plate 201 simultaneously under the action of the drive component 40.

[0054] 3. Multiple second sieve holes 302 are offset relative to the first sieve hole 203, thereby changing the size of the gap and thus changing the sieve aperture.

[0055] In summary, when using a water-soluble fertilizer processing device, rotating the drive component 40 drives the connecting rod 311 to move and abut against the auxiliary screen 301; the guide block 310 slides along the guide groove 308 to drive the auxiliary screen 301 to move along the preset direction of its own guide groove 306; multiple auxiliary screens 301 in different layers simultaneously slide relative to the main screen plate 201 under the action of the drive component 40; multiple second screen holes 302 are offset relative to the first screen holes 203, thereby changing the size of the gap and thus changing the sieve aperture, thereby reducing the need for replacement operations of filter plates of different mesh sizes through various forms of disassembly and assembly, thereby improving the efficiency of the device, improving the reliability and stability of the control of the size of the screen holes 203, and reducing pollution and impact on the equipment caused by the production process.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A water-soluble fertilizer processing device, characterized in that, include: Screening machine body (10); Screening seat (20) is installed inside the main body (10) of the screening machine; The main sieve plate (201) has an annular rotating groove (202) on its upper surface along the circumference. There is a accommodating space between the screening seat (20) and the main sieve plate (201), and the main sieve plate (201) has a plurality of adjustable sieve holes (203). Multiple auxiliary screens (301) are slidably installed in the accommodating space. The multiple auxiliary screens (301) are slidably arranged relative to the main screen plate (201) along different preset directions. The auxiliary screens (301) are provided with multiple second screen holes (302) corresponding to the screen holes (203). A passage gap is formed between the screen holes (203) and the second screen holes (302). The size of the passage gap is changed by changing the position of the multiple second screen holes (302). Multiple limiting rings (303) are provided. The screening seat (20) is provided with multiple first positioning holes (304). The multiple limiting rings (303) are provided with multiple second positioning holes (305) along the circumferential direction. The multiple limiting rings (303) and the screening seat (20) are provided with guide grooves (306). The auxiliary screen (301) is installed in the guide groove (306) and abuts against the inner side wall of the guide groove (306). A driving component (40) is rotatably mounted on the main screen plate (201), and the driving component (40) abuts against the inner wall of the rotating groove (202); The pusher (307) is rotatably mounted on the side wall of the guide groove (306), and the pusher (307) is connected to the drive member (40) in a transmission manner. Rotating the drive member (40) pushes the pusher (307) to abut against the outer wall of the secondary screen (301), thereby pushing the secondary screen (301) to slide along the guide groove (306).

2. The water-soluble fertilizer processing device according to claim 1, characterized in that, The main screen plate (201) has multiple guide grooves (308), and the secondary screen (301) has mounting grooves (309) corresponding to the guide grooves (308). Each secondary screen (301) has a guide block (310). The guide block (310) is used to engage in the guide groove (308) or to engage in the guide groove (308) after passing through the mounting groove (309), thereby limiting the sliding direction of the secondary screen (301).

3. The water-soluble fertilizer processing device according to claim 2, characterized in that, A connecting rod (311) is rotatably disposed on the pusher (307). One end of the connecting rod (311) is rotatably disposed on the pusher (307), and the other end of the connecting rod (311) is rotatably connected to the inner wall of the drive member (40). Rotating the drive member (40) drives one end of the connecting rod (311) to move along the rotation direction of the drive member (40), thereby driving the pusher (307) to rotate relative to the guide groove (306), thereby pushing the auxiliary screen (301) to slide.

4. The water-soluble fertilizer processing device according to claim 3, characterized in that, The driving component (40) is mounted on the screening seat (20). Multiple auxiliary screens (301) are stacked sequentially along the central axis of the main screen plate (201). The driving component (40) rotates to drive the pushing component (307) to push the multiple auxiliary screens (301) to slide along the corresponding preset direction, thereby changing the positional relationship between the multiple auxiliary screens (301) and the main screen plate (201) to change the size of the through gap.

5. The water-soluble fertilizer processing apparatus according to claim 4, characterized in that, Also includes: An elastic element (312) is installed in the guide groove (306) to reset the sliding of the auxiliary screen (301); A support plate (313) is installed at the bottom of the screening base (20) to support the auxiliary screen (301) installed on the screening base (20).

6. The water-soluble fertilizer processing apparatus according to claim 5, characterized in that, Also includes: An electrostatic precipitator is installed on the main body (10) of the screening machine; The ventilation device is connected to the interior of the screening machine body (10) and is used to collect and discharge the gas generated during the production of the equipment.

7. A processing method, based on the water-soluble fertilizer processing apparatus according to claim 6, characterized in that, Includes the following steps: Step 1: When it is necessary to change the sieve aperture, rotate the drive member (40) to drive the connecting rod (311) to move and abut against the auxiliary sieve (301); Step 2: The guide block (310) slides along the guide groove (308) to drive the sub-screen (301) to move along the preset direction of its own guide groove (306). The sub-screens (301) of multiple different layers slide relative to the main screen plate (201) simultaneously under the action of the drive member (40). Step 3: Multiple second sieve holes (302) are offset relative to the sieve hole (203), thereby changing the size of the gap and thus changing the sieve aperture.

Images