A reversible screen mechanism

Abstract

The utility model belongs to drying equipment technical field, especially is related to a kind of turnover screen mechanism. The existing drying screen board is designed in one-way bearing, and the working surface is downward when returning, so it cannot bear material, resulting in that screen board only plays conveying role in the first half of the whole process, and the transportation area and transmission resources in the return stage are idle, which directly limits the material processing capacity of equipment per unit time. Including two groups of symmetrical turnover mechanisms, two groups of chains are commonly connected in transmission on the two groups of turnover mechanisms, and a plurality of screen boards are commonly connected in rotation between the two groups of chains. An upper guide rail and a lower guide rail are arranged between the two groups of turnover mechanisms and below the chains. Symmetrical rotating mechanisms and guide wheels are arranged on the two short sides of the screen board. The rotating mechanisms are respectively connected in rotation between the two groups of chains. The guide wheels respectively contact and slide with the upper guide rail and the lower guide rail.

Description

Technical Field

[0001] This utility model belongs to the field of drying equipment technology, and in particular relates to a reversible screen plate mechanism. Background Technology

[0002] In the domestic drying equipment field, belt dryers are widely used in many industries such as food processing, pharmaceutical production, and chemical raw material handling due to their advantages of continuous operation, high drying efficiency, and wide applicability to materials. Among them, the drying mesh plate, as the core component for material bearing and conveying, directly affects the overall operating efficiency and material processing effect of the equipment. Currently, the mainstream drying mesh plates on the domestic market are mainly divided into two categories: wire mesh and perforated steel plate. Both are based on the traditional unidirectional load-bearing design concept, which has obvious technical limitations in practical applications.

[0003] Specifically, existing drying screens exhibit a "unidirectional" operating mode: during the main conveying stage of the belt dryer, the working surface of the screen remains upward, stably supporting the material to be dried and achieving dehydration through cooperation with the drying system. However, when the screen completes the first half of the conveying process and enters the return stage, the working surface naturally flips downward due to the limitations of the belt drive structure. Since existing screens are not designed with a structure adapted for reverse bearing, the downward-facing working surface cannot hold material, resulting in the screen remaining unloaded for extended periods during the return stage.

[0004] This "loaded in the first half, unloaded in the second half" operating mode brings multiple inconveniences to the practical application of mesh belt dryers: On the one hand, the effective conveying area of ​​the equipment is largely wasted, and the conveying capacity of the mesh plate during the return phase cannot be utilized, which limits the material processing volume per unit time. In scenarios requiring large-scale continuous production, it is often necessary to increase the number of equipment or extend the operating time, indirectly increasing production costs. On the other hand, the stress state of the unloaded return mesh plate during transmission differs from that during the load-bearing phase. Long-term unbalanced operation may accelerate the wear and deformation of the mesh plate, shorten its service life, and may also increase the operating noise and failure risk of the mesh belt drive system. In addition, for some materials that require multi-stage drying or secondary processing, since the return mesh plate cannot carry the load, an additional conveying device needs to be set up to send the material from the discharge end back to the feed end, which not only increases the complexity of the equipment structure but may also affect the final product quality due to losses during material transfer. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a flip-up screen mechanism, which solves the problem that existing drying screens, due to their unidirectional load-bearing design, cannot bear materials when the working surface is facing down during the return trip. This results in the screen only playing a conveying role in the first half of the entire process, with the transport area and transmission resources being idle during the return trip, directly limiting the material processing capacity per unit time of the equipment.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A flip-up mesh plate mechanism includes two symmetrically arranged flipping mechanisms. Two sets of chains are meshed and driven together on the two sets of flipping mechanisms, and several mesh plates are rotatably connected between the two sets of chains. An upper guide rail and a lower guide rail are provided between the two sets of flipping mechanisms and below the chains. Rotating mechanisms and guide wheels are symmetrically arranged on the two short sides of the mesh plate. The rotating mechanisms are rotatably connected between the two sets of chains, and the guide wheels are in contact with and slide against the upper guide rail and the lower guide rail, respectively.

[0007] Furthermore, the mesh plate moves back and forth between the two sets of flipping mechanisms along the chain; when the mesh plate is outside the upper and lower guide rails, the rotating mechanism drives the mesh plate to rotate with the connection point with the chain as the center.

[0008] Furthermore, the flipping mechanism includes a frame housing, inside which two sprockets are connected via an intermediate shaft. The two sprockets are respectively engaged with corresponding chains. One end of the intermediate shaft is connected to a geared motor via a coupling, and both sides of the intermediate shaft are connected to bearing seats mounted on the frame housing.

[0009] Furthermore, the inner side of the frame box is provided with a flip guide plate, which contacts the guide wheel of the mesh plate to guide the mesh plate to flip.

[0010] Furthermore, the rotating mechanism includes a spindle and a rotating shaft. The rotating shaft is fixed to the short side of the mesh plate. One end of the spindle is rotatably connected inside the rotating shaft, and the other end of the spindle passes through the pin hole of the chain link and is connected by a nut.

[0011] Furthermore, the length of the upper guide rail is less than the length of the lower guide rail; the two ends of the upper guide rail are respectively installed on the adjacent walls of the two sets of frame boxes, and the two ends of the lower guide rail are respectively installed on the bottom surface of the two sets of frame boxes, with the two ends of the lower guide rail located below the sprocket.

[0012] Furthermore, the flipping guide plate includes an integrally formed upper guide plate, a middle guide plate, and a lower guide plate.

[0013] Furthermore, the mandrel has a central hole at one end near the nut, a grease fitting is installed at one end of the central hole, and a grease hole that passes through the mandrel is opened at the other end of the central hole. The grease hole is connected to the pin hole and the central hole of the chain link.

[0014] Furthermore, the width of the upper guide rail and the lower guide rail is equal to the distance between the outer circumferential surfaces of the two guide wheels.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model eliminates the drawbacks of traditional chain plate structures that "carry loads only in the first half of the journey and leave the return journey empty," achieving stable material loading in both directions. This improvement directly activates the idle return transport resources in traditional equipment. Under the same equipment size and operating speed, the material processing capacity per unit time can be nearly doubled, effectively solving the capacity bottleneck of "requiring additional equipment investment or extended working hours" in large-scale production scenarios. At the same time, dual-journey material loading eliminates the need for additional independent conveyor lines to increase capacity, significantly reducing initial manufacturing costs, power consumption, and floor space, simplifying the overall structural complexity, and making the equipment layout more compact and the operation more efficient. Attached Figure Description

[0016] Figure 1 This is the front view of the present utility model; Figure 2 This is a front view of the flipping mechanism of this utility model; Figure 3 This is a schematic diagram of the mesh structure of this utility model; Figure 4 This is a schematic diagram of the assembly structure of the mesh plate and chain of this utility model; Figure 5 This utility model Figure 4 Enlarged structural diagram of section A in the middle. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0019] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort prior to the description are within the scope of protection of this utility model.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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 utility model.

[0022] like Figure 1-5 As shown: A flip-up mesh plate mechanism includes two sets of symmetrically arranged flipping mechanisms 1. Two sets of chains 2 are meshed and driven together on the two sets of flipping mechanisms 1. Several mesh plates 3 are rotatably connected between the two sets of chains 2. An upper guide rail 4 and a lower guide rail 5 are provided between the two sets of flipping mechanisms 1 and below the chains 2. Rotating mechanisms 6 and guide wheels 7 are symmetrically arranged on the two short sides of the mesh plates 3. The rotating mechanisms 6 are rotatably connected between the two sets of chains 2, and the guide wheels 7 are in contact with and slide with the upper guide rail 4 and the lower guide rail 5 respectively.

[0023] The dual-carrying mode ensures that the screen carries material (or is symmetrically loaded) during both its return journey, avoiding the stress differences caused by the traditional "front-loaded, rear-empty" configuration. This reduces deformation issues such as screen edge warping and mesh misalignment, while also lowering unilateral losses in belt drive components (such as guide wheels and chains), extending the overall equipment lifespan by 30%-50% and reducing the frequency of maintenance failures due to component damage. Furthermore, the return screen, capable of carrying material, provides a foundation for expanding the drying system's functionality. For example, drying units with different temperature and humidity parameters than the first half of the journey can be set up along the return path to achieve "gradient drying" or "secondary dehydration," improving drying quality. Auxiliary processes such as recoating, screening, and cooling can also be integrated into the return phase without the need for additional conveying devices, simplifying multi-stage processing and avoiding losses during material transfer, further ensuring product quality stability.

[0024] During normal drying and conveying, the working surface of the mesh plate 3 faces upward, and the guide wheel 7 is supported on the upper guide rail 4 or the lower guide rail 5 to ensure the stability of the mesh plate 3. The entire mesh plate 3 moves in the set direction under the drive of the industrial chain 2. The guide wheel 7 is equipped with a bearing in the middle, which can ensure that the guide wheel 7 can rotate freely on the upper guide rail 4 or the lower guide rail 5.

[0025] Furthermore, the mesh plate 3 moves back and forth along the chain 2 between the two sets of flipping mechanisms 1; when the mesh plate 3 is outside the upper guide rail 4 and the lower guide rail 5, the rotating mechanism 6 drives the mesh plate 3 to rotate with the connection point with the chain 2 as the center.

[0026] When sprocket 12 rotates clockwise, the mesh plate 3 moves with chain 2 to the outer right end of the upper guide rail 4 (i.e., the turning area freed from the constraint of the upper guide rail 4). At this point, the guide wheel 7 located at the right-side flipping mechanism 1 loses contact, and one side of the mesh plate 3 descends under gravity. The rotating mechanism 6 rotates around the connection point between the mesh plate 3 and chain 2 as its fixed rotation center. At this time, the mesh plate 3 is perpendicular to the lower guide rail 5. As chain 2 moves, the guide wheel 7 contacts the lower guide plate 133 for guidance, thus the inclined guide surface 31 and the guide wheel 7 sequentially contact the lower guide rail 5. The rotating mechanism 6 rotates around the connection point between the mesh plate 3 and chain 2 as its fixed rotation center, thereby making the mesh plate 3 horizontal on the lower guide rail 5. Subsequently, the working surface of the mesh plate 3 returns to its normal position. In the upward state; as the chain 2 continues to run, the mesh plate 3 moves to the left flipping mechanism 1. The guide wheel 7 of the mesh plate 3 contacts the lower guide plate 133 for guidance, then contacts the middle guide plate 132 for guidance, and then contacts the upper guide plate 131 for guidance. At this time, the working surface of the mesh plate 3, driven by the rotating mechanism 6 to rotate clockwise, faces to the left and the mesh plate 3 is perpendicular to the small guide rail 5. As the chain 12 continues to run, when the mesh plate 3 moves to the end of the upper guide rail 4, the bottom surface of the mesh plate 3 abuts against the end of the upper guide rail 4, causing the rotating mechanism 6 to rotate clockwise and drive the working surface of the mesh plate 3 to gradually rise until the mesh plate 3 is horizontal on the upper guide rail 4. Then the working surface of the mesh plate 3 returns to the upward state.

[0027] In this application, the working surface of the mesh plate 3 remains horizontal and facing upwards during the flipping operation in the flipping mechanism 1, thereby meeting the functional requirement of "two-way material loading" and avoiding the problem of no-load caused by the working surface facing downwards during the return stage in the traditional structure.

[0028] Furthermore, the flipping mechanism 1 includes a frame housing 11, inside which two sprockets 12 are connected via an intermediate shaft. The two sprockets 12 are respectively engaged with the corresponding chains 2. One end of the intermediate shaft is connected to a geared motor via a coupling, and bearing seats mounted on the frame housing 11 are connected to both sides of the intermediate shaft.

[0029] The frame housing 11 is constructed of welded steel plate, with space provided for the installation and operation of other mechanisms. It possesses sufficient rigidity to withstand the load during the tilting process. An intermediate shaft is horizontally positioned within the frame housing 11, rotatably connected to two sprockets 12, spaced apart along the axial direction of the intermediate shaft. One end of the intermediate shaft extends out of the frame housing 11 and is connected to the output shaft of a geared motor via a flexible coupling. This geared motor is a servo geared motor with braking function, capable of precisely controlling the tilting angle and providing reliable braking when stopped. To ensure the stability of the intermediate shaft's rotation, bearing seats are provided on both sides of the intermediate shaft. These bearing seats are bolted to the side walls of the frame housing 11 and rotate with the intermediate shaft using deep groove ball bearings. The bearing seats also have a sealing structure to prevent dust and debris from entering and affecting the bearing's lifespan.

[0030] Furthermore, the inner side of the frame box 11 is provided with a flip guide plate 13, which contacts the guide wheel 7 of the mesh plate 3 to guide the mesh plate 3 to flip.

[0031] Furthermore, the rotating mechanism 6 includes a spindle 61 and a rotating shaft 62. The rotating shaft 62 is fixed on the short side of the mesh plate 3. One end of the spindle 61 is rotatably connected to the rotating shaft 62, and the other end of the spindle 61 passes through the pin hole of the chain link 21 of the chain 2 and is connected by a nut.

[0032] Adopting a three-part split structure design, each mesh panel can be independently assembled and disassembled, completely changing the maintenance dilemma of traditional integral mesh panels where "one damaged part requires replacement of the entire panel." When a mesh panel experiences localized wear, deformation, or mesh blockage due to long-term use, staff only need to replace the damaged individual panel, without disassembling the entire mesh belt drive system, significantly improving operational convenience. From a cost perspective, the replacement cost of a single mesh panel is only 1 / 10 to 1 / 20 of that of an integral mesh panel (the specific ratio depends on the size and quantity of the panels), significantly reducing daily maintenance costs. From an efficiency perspective, the replacement time for a single mesh panel is typically controlled within 30 minutes, far less than the 2-4 hours required for replacing a traditional integral mesh panel, effectively reducing equipment downtime and avoiding production losses due to maintenance.

[0033] Furthermore, the length of the upper guide rail 4 is less than the length of the lower guide rail 5; the two ends of the upper guide rail 4 are respectively installed on the adjacent walls of the two sets of frame boxes 11, and the two ends of the lower guide rail 5 are respectively installed on the bottom surface of the two sets of frame boxes 11, with the two ends of the lower guide rail 5 located below the sprocket 12.

[0034] Furthermore, the flipping guide plate 13 includes an integrally formed upper guide plate 131, a middle guide plate 132, and a lower guide plate 133. The lower guide plate 133 extends downward toward the guide rail 5 with an inclined guide surface to assist the rotation of the mesh plate 3.

[0035] Furthermore, a central hole 611 is provided at one end of the spindle 61 near the nut. A grease nipple 8 is installed at one end of the central hole 611, and a grease hole 612 is provided at the other end of the central hole 611, which penetrates the spindle 61. The grease hole 612 is connected to the pin hole 211 of the chain link 21 and the central hole 611.

[0036] To ensure the flexible rotation of the mesh plate 3, grease is periodically injected into the center hole 611 through the grease nipple 8, thereby entering the pin hole 211 of the chain link 21 through the grease hole 612 to provide lubrication.

[0037] Furthermore, the widths of the upper guide rail 4 and the lower guide rail 5 are equal to the distance between the outer circumferences of the two guide wheels 7. This ensures that the mesh plate 3 can run smoothly on the guide surfaces of the upper guide rail 4 and the lower guide rail 5.

[0038] In use, during the first half of the transportation process (i.e., when the screen plate 3 is on the upper guide rail 4), the working surface of the screen plate 3 faces upward to carry the material. When the screen plate 3 moves to the right-side flipping mechanism 1 (e.g., ... Figure 1 ), disengage from the upper guide rail 4, guide wheel 7 (such as Figure 1 If the screen loses its support due to a misalignment, the screen plate 3 will rotate around the fixed center of rotation at the connection point between the screen plate 3 and the chain 2 under the influence of gravity. At this time, the material on the screen plate 3 will slide to the next layer (i.e., the screen plate 3 running horizontally on the lower guide rail 5). After flipping, the screen plate 3 continues to move forward under the drive of the sprocket 12. When the screen plate 3 reaches the sprocket 12 (such as... Figure 2 During the second half of the cycle, the guide wheel 7 of the mesh plate 3, under the action of the flipping guide plate 13, causes the mesh plate 3 to tilt forward. Finally, driven by the chain 12, and guided by the limiting guide plate 13, the mesh plate 3 moves along the lower guide rail 5 (e.g., Figure 1 The surface returns to horizontal again; at this point, the working face is still facing upwards, and it can catch the materials described earlier and continue moving forward.

[0039] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments. Those skilled in the art can make various modifications or variations to the present invention without departing from the technical concept of the present invention, and such modifications or variations naturally fall within the protection scope of the present invention.

Claims

1. A reversible screen mechanism, characterized in that: It includes two sets of symmetrically arranged flipping mechanisms (1), and two sets of chains (2) are connected to each other through meshing transmission on the two sets of flipping mechanisms (1). Several mesh plates (3) are connected to each other through rotation. An upper guide rail (4) and a lower guide rail (5) are provided between the two sets of flipping mechanisms (1) and below the chain (2); The mesh plate (3) is symmetrically provided with a rotating mechanism (6) and a guide wheel (7) on its two short sides. The rotating mechanism (6) is rotatably connected between the two sets of chains (2), and the guide wheel (7) is in contact with and slides with the upper guide rail (4) and the lower guide rail (5).

2. The reversible screen mechanism according to claim 1, characterized in that: The mesh plate (3) moves back and forth between the two sets of the flipping mechanism (1) along the chain (2); When the mesh plate (3) is located outside the upper guide rail (4) and the lower guide rail (5), the rotating mechanism (6) drives the mesh plate (3) to rotate with the connection point with the chain (2) as the center.

3. The reversible screen mechanism according to claim 2, characterized in that: The flipping mechanism (1) includes a frame box (11), and two sprockets (12) are connected inside the frame box (11) via an intermediate shaft. The two sprockets (12) are respectively meshed with the corresponding chains (2). One end of the intermediate shaft is connected to a geared motor via a coupling. Both sides of the intermediate shaft are connected to bearing seats mounted on the frame box (11).

4. The reversible screen mechanism according to claim 3, characterized in that: The inner side of the frame box (11) is provided with a flip guide plate (13), which contacts the guide wheel (7) of the mesh plate (3) to guide the mesh plate (3) to flip.

5. The reversible screen mechanism according to claim 4, characterized in that: The rotating mechanism (6) includes a spindle (61) and a rotating shaft (62). The rotating shaft (62) is fixed on the short side of the mesh plate (3). One end of the spindle (61) is rotatably connected inside the rotating shaft (62), and the other end of the spindle (61) passes through the pin hole of the chain link (21) of the chain (2) and is connected by a nut.

6. The reversible screen mechanism according to claim 5, characterized in that: The length of the upper guide rail (4) is less than the length of the lower guide rail (5); The upper guide rail (4) is installed on the adjacent walls of the two sets of frame boxes (11) at both ends, and the lower guide rail (5) is installed on the bottom surface of the two sets of frame boxes (11) at both ends, with the lower guide rail (5) located below the sprocket (12).

7. The reversible screen mechanism according to claim 6, characterized in that: The flip guide plate (13) includes an integrally formed upper guide plate (131), middle guide plate (132), and lower guide plate (133).

8. The reversible screen mechanism according to claim 7, characterized in that: The mandrel (61) has a central hole (611) at one end near the nut. A grease nipple (8) is installed at one end of the central hole (611), and a grease hole (612) is opened at the other end of the central hole (611) to pass through the mandrel (61). The grease hole (612) is connected to the pin hole (211) and the central hole (611) of the chain link (21).

9. The reversible screen mechanism according to claim 8, characterized in that: The width of the upper guide rail (4) and the lower guide rail (5) is equal to the distance between the outer circumferences of the two guide wheels (7).

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