A foreign matter screening device for producing table salt

Abstract

The utility model relates to a kind of the food salt foreign matter screening device includes independent first rack and second rack.First rack is equipped with feeding channel and internal feeding mechanism, and the side of passage is equipped with chip removal port, and the opposite side is provided with the fan air outlet higher than chip removal port, can blow off light impurities.Second rack is equipped with vibration mechanism and three layers of screen mesh distributed from top to bottom.The four-cornered roller of second screen mesh is respectively placed in the first sliding slot and the second sliding slot of two sides, and the second sliding slot one end is inclined downward.Second screen mesh is equipped with driving motor, can drive it along sliding slot movement, realize automatic dumping unloading.The device can effectively remove light and heavy impurities;With simple sliding slot, efficient automatic unloading is realized, and the structure is simple and reliable, reduces the risk of blockage and maintenance cost, improves screening efficiency and production continuity.

Description

Technical Field

[0001] This utility model relates to the field of salt production technology, and more specifically, to a foreign matter removal device for salt production. Background Technology

[0002] In the salt processing industry, foreign matter removal is a crucial step in ensuring product quality and safety. Currently, the combination of air separation and vibrating screening has become the mainstream technology in industrial production, but many technical challenges remain in its practical application.

[0003] Existing integrated air-separation and screening equipment generally adopts a rigid integral frame design. This structure causes the fan system and the vibrating screening mechanism to share the same vibration load. The fan's impeller, bearings, and other precision components are subjected to forced vibration for extended periods, which not only generates additional noise and energy consumption but also significantly shortens the equipment's lifespan. Simultaneously, the mechanical vibration of the screening system interferes with the stability of the airflow at the feed inlet, reducing the separation efficiency of light impurities and salt particles, thus affecting the air-separation effect. This inherent structural defect makes it difficult for the equipment to operate stably and continuously under optimal conditions.

[0004] Regarding the automation of the screening process, existing technologies also have some technical problems. Particularly in the critical stage of finished salt collection, traditional screens often use a fixed installation structure, with material relying on vibration to flow out naturally. This method is prone to problems such as poor discharge and material accumulation on the screen surface when handling high-moisture raw materials or requiring high production capacity. Although some equipment attempts to improve discharge efficiency by adding vibrators or tapping devices, these additional mechanisms are often complex in structure, have high manufacturing costs, and are prone to failure under continuous vibration conditions, thus increasing the frequency and difficulty of equipment maintenance.

[0005] Some more advanced automated material feeding methods, in the pursuit of automation solutions, often fall into the design trap of complicating automation for its own sake. While some automated material feeding systems using electric actuators, hydraulic servos, or precision guide rails have solved the material feeding efficiency problem to some extent, their complex structures, high costs, and demanding maintenance requirements make them problematic. This approach increases both the initial investment cost of the equipment and the complexity of subsequent operation and maintenance, especially in the high-humidity and corrosive environments of salt production, where the failure rate of complex mechanisms is often higher.

[0006] Therefore, the industry urgently needs a solution that can guarantee screening efficiency, provide reliable automatic discharge, and is structurally simple, reliable, and low-cost. This solution should be able to automatically remove and collect material from the screen surface through a simple and reliable motion mechanism, without interrupting production, thus avoiding the use of complex control systems and high-cost actuators.

[0007] As described in Chinese invention patent CN114950949B, a foreign matter screening device for rice processing includes a main frame, first fixed columns, first guide rods, a first screening frame, a screening mechanism, and a blocking mechanism. The first fixed columns are connected to the left and right sides of the lower front wall of the main frame, and the first guide rods are connected between the rear parts of the first fixed columns. A first screening frame for screening rice containing foreign matter is slidably connected to the first guide rods. A screening mechanism for screening rice containing foreign matter is located in the middle of the main frame, and a blocking mechanism for blocking material is located behind the first screening frame. Although it achieves the reciprocating motion of the screen through mechanical transmission, the overall structure is overly complex, involving numerous transmission components such as gears, rack frames, multiple sets of guide rods, and springs. This complexity not only increases manufacturing costs but also increases the risk of equipment failure and maintenance requirements during daily use. This device concentrates all moving parts on a single main frame, and the vibration generated during screening is directly transmitted to the entire system. Long-term operation can easily lead to loosening and wear of various connecting parts, affecting the service life and stability of the equipment. This device relies solely on screens with different aperture sizes for particle size classification, completely lacking air separation capabilities and thus failing to effectively remove impurities. Although its automatic feeding mechanism achieves intermittent feeding, it depends on the reciprocating motion of the second screening frame triggered by a pusher plate combination, making it prone to feeding jams. Utility Model Content

[0008] The main purpose of this invention is to propose a foreign matter screening device for salt production, which combines air separation and vibration screening and can achieve material feeding with a simple and low-cost structure.

[0009] To solve the above-mentioned technical problems, this utility model proposes a foreign matter removal device for salt production, comprising: a frame, divided into a first frame and a second frame, the first frame and the second frame being independent of each other; a feeding channel, disposed on the first frame, with a chip discharge port on one side and a chip discharge guide plate at the lower end of the chip discharge port; a feeding mechanism, disposed in the feeding channel, for ensuring uniform falling of salt; a fan, disposed on the feeding channel, with its air outlet located on the side opposite to the chip discharge port and higher than the chip discharge port; and a screening mechanism, disposed on the second frame, located below the feeding channel, comprising: a first screen, a second screen, and a third screen, arranged sequentially from top to bottom; A vibration mechanism is installed on the second frame, which drives the screening mechanism installed on it to vibrate by vibrating the second frame. The second frame has a first chute and a second chute on both sides corresponding to the position of the second screen. The first chute is a straight chute, and the second chute is divided into two sections. The section closer to the first chute is parallel to the first chute, and the section further away from the first chute is inclined downwards, so that the end of the second screen connected to the second chute moves to the inclined section of the second chute and tilts downwards. Four rollers are installed on the outside of the second screen, and the rollers are rolled one by one in the first chute and the second chute. A drive motor is also installed on the second screen, and its output shaft is connected to one of the rollers.

[0010] In the above technical solution, the feeding mechanism further includes two baffles, namely a first baffle and a second baffle. The first baffle and the second baffle are set at different heights on both sides of the inner wall of the feeding channel and are both inclined downwards, so that the salt added to the feeding channel slides from the first baffle to the second baffle and then flows out of the feeding channel from the end of the second baffle.

[0011] In any of the above technical solutions, the feeding mechanism further includes a rolling bar and a driving mechanism for driving the rolling bar. The rolling bar is rotatably disposed on the inner wall of the feeding channel and cooperates with the end of the second baffle to form a drop opening. The driving mechanism includes: a first gear disposed at one end of the rolling bar; a second gear meshing with the first gear; and a feeding motor disposed on the outer wall of the feeding channel, the output shaft of which is connected to the second gear.

[0012] In any of the above technical solutions, further, the aperture of the first screen is larger than the aperture of the second screen, and the aperture of the second screen is larger than the aperture of the third screen.

[0013] In any of the above technical solutions, the vibration mechanism further includes a vibration motor and an eccentric wheel, the vibration motor being mounted on the second frame and the eccentric wheel being mounted on the output shaft of the vibration motor.

[0014] In any of the above technical solutions, further, the end of the first slide groove near the second slide groove is higher than the other end there.

[0015] In any of the above technical solutions, a roller limiting groove is further provided in both the first and second slide grooves to restrict the axial movement of the rollers relative to the first and second slide grooves.

[0016] In any of the above technical solutions, a further provision is made of a discharge port at one end of the second screen near the second chute, and a flip plate is also provided, the upper end of which is rotatably connected to the upper end of the second screen to cover the discharge port.

[0017] In any of the above technical solutions, a first closing protrusion is provided at the upper end of the flip plate, and a second closing protrusion is provided on the side of the second frame away from the first closing protrusion. When the second screen is located directly below the first screen, the first closing protrusion and the second closing protrusion abut against each other, restricting the rotation of the flip plate and causing the flip plate to cover the discharge port.

[0018] Beneficial effects: Compared with existing technologies, it can effectively remove light and heavy impurities; the simple chute realizes efficient automatic feeding, the structure is simple and reliable, reduces the risk of clogging and maintenance costs, and improves screening efficiency and production continuity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the feeding channel of this utility model; Figure 3 This is a schematic diagram of the drive mechanism of this utility model; Figure 4 This is a schematic diagram of the screening mechanism of this utility model; Figure 5 This is a schematic diagram of the structure of this utility model in the feeding state.

[0021] The annotations in the attached figures are explained as follows: 1. Frame; 11. First frame; 12. Second frame; 121. First chute; 122. Second chute; 123. Second closed protrusion; 2. Feeding channel; 21. Chip discharge port; 22. Chip discharge guide plate; 3. Feeding mechanism; 31. Baffle; 311. First baffle; 312. Second baffle; 32. Rolling bar; 33. Drive mechanism; 331. First gear; 332. Second gear; 333. Feeding motor; 4. Fan; 5. Screening mechanism; 51. First screen; 52. Second screen; 521. Roller; 522. Drive motor; 523. Tilting plate; 5231. First closed protrusion; 53. Third screen; 6. Vibration mechanism; 61. Vibration motor; 62. Eccentric wheel. Detailed Implementation

[0022] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] It should be noted that, as shown in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0024] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] This invention proposes a foreign matter removal device for salt production.

[0028] The following embodiments will provide a detailed description of the foreign matter removal device for salt production according to this application.

[0029] Example 1:

[0030] like Figure 1 , 4As shown, this embodiment proposes a foreign matter removal device for salt production. This device includes a first frame 11 and a second frame 12, which are independent of each other. The first frame 11 has a feeding channel 2, and a feeding mechanism 3 within the feeding channel 2 ensures that the salt falls evenly. A chip discharge port 21 is located on one side of the feeding channel 2, and a fan 4 is installed on the side opposite to the chip discharge port 21, with the fan 4's outlet higher than the chip discharge port 21. The second frame 12 has a screening mechanism 5 located below the feeding channel 2. The screening mechanism 5 consists of a first screen 51, a second screen 52, and a third screen 53 arranged sequentially from top to bottom. A vibration mechanism 6 is also installed on the second frame 12. The vibration mechanism 6 vibrates the second frame 12, causing the screening mechanism 5 to vibrate. The second screen 52 is provided with a first chute 121 and a second chute 122 on both sides. The first chute 121 is a straight chute, and the second chute 122 is divided into two sections. The section closer to the first chute 121 is parallel to the first chute 121, and the section further away from the first chute 121 is inclined downward. Four rollers 521 are provided on the outer side of the second screen 52. The four rollers 521 are rolled in the first chute 121 and the second chute 122 in a one-to-one correspondence. The output shaft of the drive motor 522 on the second screen 52 is connected to one of the rollers 521. When the drive motor 522 is working, it drives the roller 521 to rotate, thereby driving the second screen 52 to move along the chute. When the end of the second screen 52 connected to the second chute 122 moves to the inclined section of the second chute 122, it tilts downward.

[0031] Existing integrated air separation and screening equipment adopts a rigid integral frame design. The fan system and the vibrating screening mechanism share the same vibration load. Precision components such as the impeller bearings of the fan are in a forced vibration environment for a long time, which will generate additional noise and energy consumption and shorten the service life of the equipment. At the same time, the mechanical vibration of the screening system will interfere with the stability of the airflow at the feed inlet, reduce the separation efficiency of light impurities and salt particles, and affect the air separation effect. In the finished salt collection stage during the screening process, the discharge structure of the existing equipment is prone to poor discharge and material accumulation. Some additional mechanisms to improve the discharge are complex in structure and have high manufacturing costs. They are prone to failure under continuous vibration conditions, increasing the frequency and difficulty of equipment maintenance.

[0032] This device employs independent first frame 11 and second frame 12, separating the first frame 11 containing the blower 4 from the second frame 12 containing the vibration mechanism 6 and the screening mechanism 5. This avoids the blower 4 bearing vibration loads, reduces noise and energy consumption, and extends the service life of the blower 4. At the same time, it prevents the vibration of the screening system 5 from interfering with the airflow at the feed inlet, ensuring airflow stability, improving the separation efficiency of light impurities and salt particles, and enhancing the air separation effect. The second screen 52 moves along the chute under the drive of the drive motor 522 through the cooperation of the roller 521 with the first chute 121 and the second chute 122. Automatic material discharge is achieved by using the downward inclined section of the second chute 122. This structure is simple and reliable, requiring no complex additional mechanisms, reducing manufacturing costs, reducing the possibility of failure, reducing maintenance frequency and difficulty, and effectively solving the problem of material accumulation due to poor discharge.

[0033] Example 2:

[0034] This embodiment is a further improvement based on Embodiment 1.

[0035] like Figure 1 , 2 As shown in Figures 1 and 3, in this embodiment, The feeding mechanism 3 is located in the feeding channel 2 of the first frame 11, and includes two baffles 31, a rolling rod 32, and a driving mechanism 33 for driving the rolling rod 32. The two baffles 31 are a first baffle 311 and a second baffle 312, which are distributed at different heights on both sides of the inner wall of the feeding channel 2 and are both inclined downwards. Salt added to the feeding channel 2 will first slide down from the first baffle 311 to the second baffle 312, and then flow out from the end of the second baffle 312. The rolling rod 32 is rotatably mounted on the inner wall of the feeding channel 2 and cooperates with the end of the second baffle 312 to form a salt drop outlet. The driving mechanism 33 consists of a first gear 331, a second gear 332, and a feeding motor 3. The system consists of three components: a first gear 331 is mounted on one end of a rolling bar 32; a second gear 332 meshes with the first gear 331; a feeding motor 333 is fixed on the outer wall of the feeding channel 2; and its output shaft is connected to the second gear 332. When the feeding motor 333 is working, it drives the second gear 332 to rotate, which in turn drives the first gear 331 to rotate, thereby causing the rolling bar 32 to rotate as well. The rotation of the rolling bar 32 controls the speed and amount of salt flowing out of the drop outlet, thus achieving uniform salt drop.

[0036] In the existing technology, the feeding process is prone to uneven salt distribution, with some areas having excessive salt accumulation and others having insufficient salt. This unevenness will lead to inconsistent contact areas between salt and light impurities in the subsequent air separation process, making it difficult for light impurities to be fully separated. At the same time, the unevenly distributed salt may also cause blockages at the end of the feed channel 2 or the inlet of the screening mechanism 5, hindering the progress of the overall processing flow and reducing production efficiency.

[0037] The two inclined baffles 31 of the feeding mechanism 3 cause the salt to slide down in stages, avoiding the impact and accumulation caused by the salt falling directly from the top of the feeding channel 2, thus initially ensuring the stability of the salt's fall. The falling opening formed by the rolling rod 32 and the second baffle 312, together with the rotation of the rolling rod 32 driven by the feeding motor 333, can precisely control the falling speed and the amount of salt falling at one time, ensuring that the salt enters the subsequent process in a uniform state. This not only improves the separation effect of light impurities in the air separation process, but also reduces the possibility of blockage at the inlet of the feeding channel 2 and the screening mechanism 5, ensuring the overall processing efficiency.

[0038] Example 3:

[0039] This embodiment is a further improvement based on any of the above embodiments.

[0040] like Figure 2 As shown, in this embodiment, The air separation function, as the core component of this device for removing light impurities, is integrated into the feed channel 2 structure of the first frame 11. Through directional airflow and uniform material distribution design, it achieves the separation of salt and light impurities, providing raw materials with higher purity for subsequent screening processes.

[0041] The blower 4 is fixedly installed on one side of the outer wall of the feed channel 2. Its air outlet is connected to the inside of the feed channel 2, and the height of the air outlet is set higher than the chip discharge port 21 on the other side of the feed channel 2. The chip discharge port 21 is opened on the side wall of the feed channel 2 opposite to the air outlet of the blower 4. A chip discharge guide plate 22 extends from its lower end. The chip discharge guide plate 22 is inclined downward to guide the light impurities discharged from the chip discharge port 21 to fall into the collection container in a directional manner, so as to prevent the impurities from scattering to the surrounding area of ​​the equipment and causing pollution or secondary mixing of salt.

[0042] After the salt enters the feeding channel 2 through the feeding mechanism 3, it falls slowly and evenly, avoiding the accumulation of salt into a column. The rotation of the rolling rod 32 controls the falling speed of the salt, allowing the salt particles to pass through the airflow area in small batches and thin layers. At this time, the blower 4 starts, continuously supplying airflow into the feeding channel 2. The airflow blows laterally from the air outlet towards the chip discharge port 21. Light impurities are carried by the airflow to the chip discharge port 21 and discharged, while the salt particles maintain a stable falling trajectory and eventually pass through the bottom of the feeding channel 2 into the screening mechanism 5 below.

[0043] This device uses the step-by-step flow guidance of the feeding mechanism 3 and the speed control of the rolling bar 32 to make the salt pass through the airflow area in a dispersed and uniform state. The airflow can fully contact each salt particle and the attached light impurities, ensuring that the impurities are completely removed and avoiding the problem of insufficient airflow penetration caused by salt accumulation.

[0044] Example 4:

[0045] This embodiment is a further improvement based on any of the above embodiments.

[0046] like Figure 1 , 4 As shown in Figures 5 and 6, in this embodiment, The screening mechanism 5 is mounted on the second frame 12 and located below the feed channel 2. It includes a first screen 51, a second screen 52, and a third screen 53 arranged sequentially from top to bottom. The aperture of the first screen 51 is larger than that of the second screen 52, and the aperture of the second screen 52 is larger than that of the third screen 53. Driven by the vibration mechanism 6, the screening mechanism 5 vibrates as a whole. The salt falling from the feed channel 2 first contacts the first screen 51. Larger particles of impurities are trapped by the first screen 51, while smaller particles of salt and impurities pass through the first screen 51 and fall to the second screen 52, where the second screen 52 traps the salt. Even finer impurities pass through the second screen 52 and fall to the third screen 53, thus completing the grading and separation of salt and impurities of different particle sizes.

[0047] The second frame 12 has a first groove 121 and a second groove 122 on both sides corresponding to the position of the second screen 52. The first groove 121 is a straight groove with one end closer to the second groove 122 being higher than the other end. The second groove 122 is divided into two sections: the section closer to the first groove 121 is parallel to the first groove 121, and the section further away from the first groove 121 slopes downward. Four rollers 521 are provided on the outer side of the second screen 52, and the four rollers 521 are rolled one-to-one in the first groove 121 and the second groove 122. The first slide 121 and the second slide 122 are both provided with roller 521 limiting grooves to restrict the axial movement of the roller 521. The second screen 52 is equipped with a drive motor 522, the output shaft of which is connected to one of the rollers 521. When the drive motor 522 is working, it drives the roller 521 to rotate, so that the second screen 52 moves along the slide. When the end of the second screen 52 connected to the second slide 122 moves to the inclined section of the second slide 122, the second screen 52 tilts downward.

[0048] The second screen 52 has a discharge port at one end near the second chute 122, and is also equipped with a tilting plate 523. The upper end of the tilting plate 523 is rotatably connected to the upper end of the second screen 52. The upper end of the tilting plate 523 has a first closing protrusion 5231. The second frame 12 has a second closing protrusion 123 on the side of the first closing protrusion 5231 away from the second chute 122. When the second screen 52 is located directly below the first screen 51, the first closing protrusion 5231 and the second closing protrusion 123 abut against each other, restricting the rotation of the tilting plate 523 and causing the tilting plate 523 to cover the discharge port. When the second screen 52 is tilted, the first closing protrusion 5231 and the second closing protrusion 123 separate, the tilting plate 523 opens under the action of gravity, and the salt trapped on the second screen 52 is discharged from the discharge port.

[0049] The existing screening mechanism 5 is prone to poor grading, failing to completely separate salt of different particle sizes from impurities, resulting in insufficient purity of the finished salt. Furthermore, some screening mechanisms 5 rely on manual assistance or complex electric / hydraulic drive structures for screen feeding. Manual assistance increases labor costs and has low feeding efficiency, while complex drive structures are not only expensive to manufacture but also prone to malfunction in high-humidity, dusty environments, causing poor feeding, screen blockage, and affecting production continuity. In addition, some screens are prone to material leakage from the feeding port during the screening process, resulting in salt waste.

[0050] The screening mechanism 5 of this device adopts a three-layer screen with progressively smaller apertures. Under vibration, it achieves gradual grading from coarse to fine, which can trap impurities of different particle sizes and ensure the purity of the finished salt. The second screen 52 automatically tilts and discharges material through the cooperation of rollers 521 and chute and the drive of drive motor 522. It does not require manual intervention and has a simple and reliable structure, which reduces manufacturing costs and failure probability, avoids poor material discharge and screen blockage, and ensures production continuity. In the screening state, the tilting plate 523 covers the discharge port through the cooperation of the first closing protrusion 5231 and the second closing protrusion 123 to prevent salt leakage. It automatically opens when tilting and discharging material to ensure that impurities are discharged smoothly and reduce salt waste.

[0051] Example 5:

[0052] This embodiment is a further improvement based on any of the above embodiments.

[0053] like Figure 1 , 4 As shown, in this embodiment, The vibration mechanism 6 is mounted on the second frame 12 and consists of a vibration motor 61 and an eccentric wheel 62. The vibration motor 61 is fixed in a suitable position on the second frame 12, and the eccentric wheel 62 is mounted on the output shaft of the vibration motor 61. When the vibration motor 61 is started, its output shaft drives the eccentric wheel 62 to rotate at high speed, causing the second frame 12 to vibrate regularly. This vibration is transmitted to the screening mechanism 5 mounted on the second frame 12, causing the screening mechanism 5 to vibrate as a whole. The salt particles on the screening mechanism 5 are continuously dispersed and moved under the action of vibration, thereby achieving particle size classification and impurity separation through different screens.

[0054] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A foreign matter removal device for salt production, characterized in that, include: The rack (1) is divided into a first rack (11) and a second rack (12), and the first rack (11) and the second rack (12) are independent of each other; The feeding channel (2) is set on the first frame (11), and a chip discharge port (21) is provided on one side of it. A chip discharge guide plate (22) is provided at the lower end of the chip discharge port (21). The feeding mechanism (3) is located in the feeding channel (2) and is used to make the salt fall evenly. A blower (4) is installed on the feed channel (2), and its air outlet is located on the side opposite to the chip discharge port (21) and higher than the chip discharge port (21); The screening mechanism (5) is set on the second frame (12) and located below the feed channel (2), and includes: a first screen (51), a second screen (52) and a third screen (53) arranged in order from top to bottom; And a vibration mechanism (6) is provided on the second frame (12), which drives the screening mechanism (5) provided on it to vibrate by vibrating the second frame (12); The second frame (12) is provided with a first chute (121) and a second chute (122) on both sides corresponding to the position of the second screen (52). The first chute (121) is a straight chute. The second chute (122) is divided into two sections. The section near the first chute (121) is parallel to the first chute (121), and the section away from the first chute (121) is inclined downwards, so that when the end of the second screen (52) connected to the second chute (122) moves to the second chute (122) and tilts downwards, the screen (52) tilts downwards. Four rollers (521) are provided on the outside of the second screen (52). The rollers (521) are rolled in the first chute (121) and the second chute (122) respectively. A drive motor (522) is also provided on the second screen (52), and its output shaft is connected to one of the rollers (521).

2. The foreign matter removal device for salt production according to claim 1, characterized in that, The feeding mechanism (3) includes: There are two baffles (31), namely a first baffle (311) and a second baffle (312). The first baffle (311) and the second baffle (312) are set at different heights on both sides of the inner wall of the feed channel (2) and are inclined downwards, so that the salt added to the feed channel (2) slides from the first baffle (311) onto the second baffle (312) and then flows out of the feed channel (2) from the end of the second baffle (312).

3. The foreign matter removal device for salt production according to claim 2, characterized in that, The feeding mechanism (3) further includes a rolling bar (32) and a driving mechanism (33) for driving the rolling bar (32). The rolling bar (32) is rotatably disposed on the inner wall of the feeding channel (2) and cooperates with the end of the second baffle (312) to form a drop opening. The drive mechanism (33) includes: a first gear (331) disposed at one end of the rolling bar (32); a second gear (332) meshing with the first gear (331); and a feeding motor (333) disposed on the outer wall of the feeding channel (2), the output shaft of which is connected to the second gear (332).

4. The foreign matter removal device for salt production according to claim 1, characterized in that, The aperture of the first screen (51) is larger than that of the second screen (52), and the aperture of the second screen (52) is larger than that of the third screen (53).

5. The foreign matter removal device for salt production according to claim 1, characterized in that, The vibration mechanism (6) includes a vibration motor (61) and an eccentric wheel (62). The vibration motor (61) is mounted on the second frame (12), and the eccentric wheel (62) is mounted on the output shaft of the vibration motor (61).

6. The foreign matter removal device for salt production according to claim 1, characterized in that, The first groove (121) is higher at one end than the other end of the second groove (122).

7. The foreign matter removal device for salt production according to claim 1, characterized in that, Both the first slide groove (121) and the second slide groove (122) are provided with roller (521) limiting grooves to restrict the axial movement of the roller (521) relative to the first slide groove (121) and the second slide groove (122).

8. The foreign matter removal device for salt production according to claim 1, characterized in that, The second screen (52) has a discharge port at one end near the second chute (122), and a flip plate (523) is also provided, the upper end of which is rotatably connected to the upper end of the second screen (52) to cover the discharge port.

9. The foreign matter removal device for salt production according to claim 8, characterized in that, The upper end of the flip plate (523) is provided with a first closing protrusion (5231), and the second frame (12) is provided with a second closing protrusion (123) on the side of the second frame (122) away from the second slide groove (122) corresponding to the first closing protrusion (5231). When the second screen (52) is located directly below the first screen (51), the first closing protrusion (5231) and the second closing protrusion (123) abut against each other, restricting the rotation of the flip plate (523) so that the flip plate (523) covers the discharge port.

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