An adjustable safety screen

Abstract

The application relates to an adjustable safety screen. The adjustable safety screen comprises a primary filtering screen, screen baffle plates arranged at the back, left side and right side of the primary filtering screen, connecting blocks symmetrically arranged outside the screen baffle plates at the two sides of the primary filtering screen, vertical adjusting air cylinders fixedly installed on the connecting blocks, angle adjusting air cylinders obliquely arranged between one side of the vertical adjusting air cylinders and the connecting blocks, and hinges between the angle adjusting air cylinders, the vertical adjusting air cylinders and the connecting blocks. An oscillator is installed on the primary filtering screen, and a controller is electrically connected with the vertical adjusting air cylinders, the angle adjusting air cylinders and the oscillator. The application can precisely match the limited conditions on site, does not need large-scale reconstruction, realizes full-process automation, improves screening efficiency and finished product qualification rate, prevents external leakage and manual operation risks, guarantees production safety, has low maintenance cost and prolongs the service life of the equipment.

Description

Technical Field

[0001] This application relates to the field of screen device technology, and more particularly to an adjustable safety screen. Background Technology

[0002] In the production of salt for food processing, the purity of salt directly affects product quality and customer acceptance. The presence of lumpy salt is one of the core quality risks. Lumpy salt mainly occurs during the sulfidation fluidized bed drying process (salt particle agglomeration under high temperature) and the iodization mixing process (mechanical stirring causes localized salt particle clumping). Its shape is irregular, and its diameter is mostly concentrated between 2-8mm. Customers explicitly require the removal of lumpy salt larger than 2mm; otherwise, it will lead to complaints about impurities in the packaged finished product and may even affect the stability of downstream food processing techniques.

[0003] Current industry methods for processing salt and sand through screening have significant limitations: Poor equipment adaptability: The existing packaging production line did not reserve space for the installation of screening equipment during the early construction. Traditional power safety screens (such as vibrating screens and drum screens) are large in size and require a fixed base, which cannot be adapted to the on-site installation conditions where "only the material inlet of the silo is available". Forced modification will lead to production line shutdown and extremely high costs.

[0004] Insufficient processing efficiency: The instantaneous salt intake of a food processing salt production line can reach 110 tons / hour, while the traditional small screening equipment can only process 30-50 tons / hour. This easily leads to salt and sand accumulation and blockage of the feed inlet, seriously affecting the continuity of production.

[0005] Low level of automation: Traditional screening equipment requires manual cleaning of residual lumpy salt on the screen surface at regular intervals, which not only increases labor costs, but may also cause screen blockage due to untimely cleaning. In addition, there are safety risks of contact with salt and sand during manual operation (such as slipping and dust inhalation).

[0006] In summary, existing technologies cannot simultaneously meet the production requirements of "limited on-site installation, large processing capacity, compatibility with no / low power, leakage prevention, automated cleaning, and multi-level protection." There is an urgent need to develop an adjustable safety sieve that is highly adaptable, efficient, and safe to solve the problem of screening blocky salt in the production of salt for food processing. Utility Model Content

[0007] To address or partially address the problems existing in related technologies, this application provides an adjustable safety screen.

[0008] This application provides an adjustable safety screen, comprising: Primary filter screen 1: installed between the outlet of the salt separator and the inlet of the hopper 7; Screen baffle 2: It is set on the rear, left and right sides of the primary filter screen 1, and connecting blocks 3 are symmetrically arranged on the outer sides of the screen baffle 2 on both sides of the primary filter screen 1. Vertical adjustment cylinder 4: It is fixedly installed on the connecting block 3. The end of the vertical adjustment cylinder 4 is connected to the side plate of the salt separator outlet. An angle adjustment cylinder 5 is inclinedly arranged between one side of the vertical adjustment cylinder 4 and the connecting block 3. The angle adjustment cylinder 5, the vertical adjustment cylinder 4, and the connecting block 3 are all hinged. Vibrator 6: Installed on primary filter screen 1; Controller: Electrically connected to vertical adjustment cylinder 4, angle adjustment cylinder 5, and vibrator 6 respectively.

[0009] Optionally, in some embodiments, the primary filter screen 1 is a strip screen, and the strip screen is arranged in the direction of inclination of the primary filter screen 1.

[0010] Optionally, in some embodiments, a secondary filtration device is provided on the lower side of the discharge port of the hopper 7.

[0011] Optionally, in some embodiments, the secondary filtration device includes: Secondary feeding hopper 8: Located below the discharge port of feeding hopper 7; Secondary filter screen 9: Adjustably installed at the feed inlet of the secondary feed hopper 8, and a block material discharge port 10 is provided on one side of the feed inlet of the secondary feed hopper 8; Adjustment mechanism: includes a secondary adjustment cylinder 11, an adjustment protrusion 12, and a rotating shaft 13. The rotating shaft 13 passes through the secondary filter screen 9 and is fixedly connected to the secondary filter screen 9. Its two ends are rotatably connected to the end plate of the secondary discharge hopper 8. An adjustment protrusion 12 is installed at one end of the rotating shaft 13. The secondary adjustment cylinder 11 is hinged to one end of the adjustment protrusion 12. One end of the secondary adjustment cylinder 11 is hinged to the outer wall of the secondary discharge hopper 8.

[0012] The technical solution provided in this application may include the following beneficial effects: (1) Adaptability: Precisely matches the limited conditions on site, requiring no large-scale modification: The primary filter screen, with the help of a vertical adjustment cylinder and connecting block, can flexibly adjust its vertical height to precisely align with the discharge port of the salt separator and the inlet of the hopper, without requiring modifications to the existing production line base and pipelines, thus solving the problem of "limited installation space". It adopts "primarily natural material falling without power, supplemented by vibrator auxiliary power", which not only avoids the limitations of on-site non-powered equipment installation conditions, but also improves the salt and sand throughput through the vibrator, adapting to the instantaneous salt intake of 110 tons / hour and avoiding salt and sand accumulation. The angle adjustment cylinder can precisely control the tilt angle of the primary and secondary filter screens, preventing excessive tilt from causing salt and sand leakage, while ensuring that lumpy salt can slide off naturally, balancing the contradiction between "leakage prevention" and "screening efficiency".

[0013] (2) High efficiency: The entire process is automated, improving screening efficiency and finished product qualification rate. Automated screening and cleaning: By linking the vertical adjustment cylinder, angle adjustment cylinder, vibrator and secondary adjustment mechanism through the controller, the entire process of "primary screening - primary block salt cleaning - secondary screening - secondary block salt cleaning" is automated, eliminating the need for manual cleaning of the screen surface at regular intervals, avoiding screen blockage caused by delays in manual operation, and reducing labor costs; Multi-level protection improves the pass rate: The dual screening structure of primary and secondary screening can intercept lumpy salt larger than 2mm that is missed in the primary screening, greatly reducing the residual rate of lumpy salt in the finished salt and solving the problem of "missed screening cannot be remedied" in traditional single-stage screening. High throughput adaptability: The primary filter screen adopts a strip screen design (block salt is easy to slide off and easy to clean), and with the help of a vibrator to assist in material feeding, the salt and sand throughput is significantly improved. It can stably handle an instantaneous salt intake of 110 tons / hour, avoiding production line shutdown due to screening bottlenecks.

[0014] (3) Safety: Prevent leakage and human error risks to ensure production safety. Screen baffles are installed on the rear and left and right sides of the primary filter screen. With precise control of the tilt angle, these baffles prevent salt and sand from splashing and leaking during the screening process, avoiding raw material waste and the risk of slipping on the ground. The fully automated process reduces direct contact between humans and salt and sand, avoiding safety hazards such as slipping and dust inhalation during manual cleaning. At the same time, lumpy salt is collected through the directional lumpy material outlet, avoiding on-site management chaos caused by lumpy salt scattering. The interlocking action of the safety screen and the salt separator (the screen lifts when the salt separator is pressed down, and the screen lowers when the salt separator is lifted) ensures that there is no leakage of salt and sand during the salt separation process, avoiding equipment failure or safety accidents caused by salt and sand accumulation.

[0015] (4) Economic efficiency: low maintenance costs and extended equipment lifespan. The primary filter screen uses a bar screen, which has a simple structure and is easy to manufacture and install. In the later stages of wear, only individual screen bars need to be replaced, without the need to replace the entire screen. The secondary filter screen is connected to the secondary feed hopper by a rotating shaft, which ensures uniform force distribution, reduces component wear, and extends the service life of the equipment. The automated process reduces labor costs, and multi-stage screening reduces the rework rate of defective products. At the same time, it avoids raw material waste caused by salt and sand leakage, thus reducing the total production cost from the three aspects of "manpower, raw materials, and maintenance".

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0018] Figure 1 This is a schematic diagram of the adjustable safety screen shown in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the adjustable safety screen shown in Embodiment 2 of this application; Figure 3 This is a schematic diagram of the secondary filter screen in a non-working state as shown in Embodiment 2 of this application; Figure 4 This is a schematic diagram of the structure of the secondary filter screen in the state of discharging blocky salt, as shown in Embodiment 2 of this application.

[0019] Figure label: 1- Primary filter screen, 2- Screen baffle, 3- Connecting block, 4- Vertical adjustment cylinder, 5- Angle adjustment cylinder, 6- Vibrator, 7- Feed hopper, 8- Secondary feed hopper, 9- Secondary filter screen, 10- Block material outlet, 11- Secondary adjustment cylinder, 12- Adjustment protrusion, 13- Rotating shaft. Detailed Implementation

[0020] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0021] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be understood that the terms "length", "width", "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, and 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, and therefore should not be construed as a limitation of this application.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] To address the aforementioned issues, this application provides an adjustable safety screen.

[0025] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0026] Example 1 See Figure 1 The adjustable safety screen includes: Primary filter screen 1: installed between the outlet of the salt separator and the inlet of the hopper 7; Screen baffle 2: It is set on the rear, left and right sides of the primary filter screen 1, and connecting blocks 3 are symmetrically arranged on the outer sides of the screen baffle 2 on both sides of the primary filter screen 1. Vertical adjustment cylinder 4: It is fixedly installed on the connecting block 3. The end of the vertical adjustment cylinder 4 is connected to the side plate of the salt separator outlet. An angle adjustment cylinder 5 is inclinedly arranged between one side of the vertical adjustment cylinder 4 and the connecting block 3. The angle adjustment cylinder 5, the vertical adjustment cylinder 4, and the connecting block 3 are all hinged. Vibrator 6: Installed on primary filter screen 1; Controller: Electrically connected to vertical adjustment cylinder 4, angle adjustment cylinder 5, and vibrator 6 respectively.

[0027] The controller receives the production line start signal and drives the vertical adjustment cylinder 4 to adjust the primary filter screen 1 to the preset height through the connecting block 3, ensuring that the primary filter screen 1 is accurately aligned with the salt separator outlet and the feed hopper 7 inlet, without any gaps or salt leakage.

[0028] The salt separator starts working, and the salt falls from the outlet of the salt separator into the primary filter screen 1. The controller starts the vibrator to help the salt pass through the screen quickly and avoid accumulation. Pieces of salt larger than 2mm are intercepted on the screen surface.

[0029] When the primary filter screen 1 operates for the preset time or the controller detects an increase in screen surface pressure (indicating the accumulation of lumpy salt), the controller first stops the vibrator 6, and then drives the angle adjustment cylinder 5 to increase the tilt angle of the primary filter screen 1 (e.g., 30-45°), so that the lumpy salt on the screen surface slides off the screen surface along the tilt direction and falls into the preset collection device; after cleaning is completed, the angle adjustment cylinder 5 resets, and the primary filter screen 1 returns to the tilt angle of the screening stage, and enters the next screening cycle.

[0030] If the height needs to be temporarily adjusted on site (such as fine-tuning the position of the salt separator), the controller can drive the vertical adjustment cylinder 4 to extend and retract, thereby moving the connecting block 3 up and down and adjusting the height of the primary filter screen 1 in sync to ensure that it is always aligned with the discharge port and the feed port.

[0031] By combining the vertical adjustment cylinder 4 and the connecting block 3, the vertical height of the primary filter screen 1 can be flexibly adjusted according to the height of the feed inlet of the silo and the position of the salt separator outlet, without requiring large-scale modifications to the existing production line and solving the problem of "limited installation conditions". The angle adjustment cylinder 5 can precisely control the tilt angle of the primary filter screen 1, avoiding excessive tilting that could cause salt leakage. Combined with the vibrator 6 to assist the salt in falling, it not only meets the on-site requirements of "primarily non-powered, with auxiliary power as a supplement", but also improves the salt throughput, adapting to an instantaneous salt intake of 110 tons / hour. Without manual intervention, the controller can link the vertical adjustment cylinder 4, the angle adjustment cylinder 5, and the vibrator 6 to achieve an automatic cycle of "screening - cleaning of lumpy salt", reducing labor costs and safety risks.

[0032] The primary filter screen 1 is a strip screen, and the strip screen is arranged in the inclined direction of the primary filter screen 1.

[0033] When salt falls into the primary filter screen 1, the bar screen bars are arranged in an inclined direction, allowing the salt to fall quickly along the gaps between the bar screen bars (good passability). However, because the volume of lumpy salt is larger than the gaps between the bar screen bars, it is intercepted by the bar screen bars and slides down naturally along the inclined direction. The arrangement direction of the bar screen is consistent with the inclined direction of the primary filter screen 1, making it easier for lumpy salt to slide down along the direction of the bar screen bars, avoiding getting stuck in the gaps between the screens, reducing the risk of leakage, and effectively intercepting lumpy salt larger than 2mm.

[0034] Example 2 See Figure 2-4 Based on Example 1, a secondary filtration device is provided below the discharge port of the hopper 7. The secondary filtration device includes: Secondary feeding hopper 8: Located below the discharge port of feeding hopper 7; Secondary filter screen 9: Adjustably installed at the feed inlet of the secondary feed hopper 8, and a block material discharge port 10 is provided on one side of the feed inlet of the secondary feed hopper 8; Adjustment mechanism: includes a secondary adjustment cylinder 11, an adjustment protrusion 12, and a rotating shaft 13. The rotating shaft 13 passes through the secondary filter screen 9 and is fixedly connected to the secondary filter screen 9. Its two ends are rotatably connected to the end plate of the secondary discharge hopper 8. An adjustment protrusion 12 is installed at one end of the rotating shaft 13. The secondary adjustment cylinder 11 is hinged to one end of the adjustment protrusion 12. One end of the secondary adjustment cylinder 11 is hinged to the outer wall of the secondary discharge hopper 8.

[0035] Adding a secondary filtration stage to the primary screening process can intercept lumpy salt that was missed during the primary screening (such as small lumps of salt that have become stuck and fallen off due to vibration), reducing the lumpy salt content in the finished salt to an extremely low level to meet the customer's stringent quality requirements. When the production demand is "high-purity salt sand", the controller sends a signal, and the secondary regulating cylinder 11 actuates, driving the secondary filter screen 9 to rotate to a horizontal or slightly inclined angle (such as 3-5°) through the adjusting protrusion 12 and the rotating shaft 13, so that it covers the feed inlet of the secondary discharge hopper 8.

[0036] The controller drives the secondary regulating cylinder 11 to shorten, pushing the regulating protrusion 12 to rotate around the rotating shaft 13, causing the secondary filter screen 9 to rotate to a horizontal position (or a small tilt angle), covering the feed inlet of the secondary discharge hopper 8. Salt and sand screened in the primary stage fall into the secondary filter screen 9, while qualified salt and sand pass through the screen and enter the secondary discharge hopper 8, leaving lumpy salt residue on the screen surface. When the lumpy salt on the secondary filter screen 9 accumulates to a certain extent (or the controller detects an increase in screen surface pressure), the controller drives the secondary regulating cylinder 11 to continue contracting, pulling the regulating protrusion 13 to rotate in the opposite direction. This tilts the secondary filter screen 9 towards the lumpy discharge outlet 10 (e.g., 45°) via the rotating shaft 13, causing the lumpy salt on the screen surface to slide out from the lumpy discharge outlet 10 along the tilt direction and fall into the preset collection device. If secondary screening is not required, the controller continuously drives the secondary regulating cylinder 11 to extend, keeping the secondary filter screen 9 at a large tilt angle, completely avoiding the feed inlet of the secondary discharge hopper 8. Salt and sand fall directly from the discharge hopper 7 into the secondary discharge hopper 8, achieving unobstructed conveying.

[0037] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0038] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0039] The various embodiments of this application 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. An adjustable safety screen, characterized in that: The adjustable safety screen includes: Primary filter screen (1): set between the outlet of the salt separator and the inlet of the hopper (7); Screen baffle (2): Set on the rear, left and right sides of the primary filter screen (1), and connecting blocks (3) are symmetrically arranged on the outer sides of the screen baffle (2) on both sides of the primary filter screen (1). Vertical adjustment cylinder (4): It is fixedly installed on the connecting block (3). The end of the vertical adjustment cylinder (4) is connected to the side plate of the salt separator outlet. An angle adjustment cylinder (5) is inclined between one side of the vertical adjustment cylinder (4) and the connecting block (3). The angle adjustment cylinder (5), the vertical adjustment cylinder (4), and the connecting block (3) are all hinged. Vibrator (6): Installed on the primary filter screen (1); Controller: Electrically connected to the vertical adjustment cylinder (4), the angle adjustment cylinder (5), and the vibrator (6) respectively.

2. The adjustable safety screen according to claim 1, characterized in that: The primary filter screen (1) is a strip screen, and the arrangement direction of the strip screen is towards the inclined direction of the primary filter screen (1).

3. The adjustable safety screen according to claim 1 or 2, characterized in that: A two-stage filtration device is provided on the lower side of the discharge port of the hopper (7).

4. The adjustable safety screen according to claim 3, characterized in that: The secondary filtration device includes: Secondary feeding hopper (8): Located below the discharge port of feeding hopper (7); Secondary filter screen (9): Adjustably installed at the feed inlet of the secondary feed hopper (8), and a block material discharge port (10) is provided on one side of the feed inlet of the secondary feed hopper (8). Adjustment mechanism: includes a secondary adjustment cylinder (11), an adjustment protrusion (12), and a rotating shaft (13). The rotating shaft (13) passes through the secondary filter screen (9) and is fixedly connected to the secondary filter screen (9). Its two ends are rotatably connected to the end plate of the secondary discharge hopper (8). An adjustment protrusion (12) is installed at one end of the rotating shaft (13). The secondary adjustment cylinder (11) is hinged at one end of the adjustment protrusion (12). One end of the secondary adjustment cylinder (11) is hinged to the outer wall of the secondary discharge hopper (8).

Images