A beer malt fractionating screening device and process

Abstract

The present application relates to the technical field of malt screening, in particular to a beer malt grading and screening device and process, comprising a vibrating bed, a screening bin is fixedly installed on the vibrating bed, a plurality of screen passing mechanisms arranged in an up-down manner are arranged inside the screening bin, the screen passing mechanisms are used for continuously screening malt particles and performing online unblocking, a conveying belt assembly is adopted to drive the screen frame and the steel wire ropes thereon to continuously move, so that the steel wire ropes rotating to the upper part of the conveying belt assembly are kept in a taut state under the action of the tensioning structure, the mesh holes formed by the combination of the steel wire ropes are used for screening the malt particles; when the screen frame and the steel wire ropes continue to rotate to the lower part with the conveying belt assembly, the steel wire ropes are turned to a relaxed state through the tensioning structure, the mesh holes are expanded, the malt particles stuck on the steel wire ropes are automatically dropped under the action of gravity and the vibration of the vibrating bed, online unblocking is completed, and self-cleaning of the screen can be realized without stopping.

Description

Technical Field

[0001] This invention relates to the field of malt screening technology, specifically to a beer malt grading and screening device and process. Background Technology

[0002] Beer malt is the core raw material for brewing beer. It is made from barley through processes such as soaking, germination, drying, and root removal. Malt converts starch into sugar through enzymatic hydrolysis and provides the necessary nitrogen and phosphorus nutrients for yeast fermentation. The quality of malt directly affects key attributes of beer such as color, flavor, body, and alcohol concentration after fermentation.

[0003] Finished beer malt must be graded and screened, with malt particles divided into three grades—large, medium, and small—using sieves with different apertures such as 2.2mm, 2.5mm, and 2.8mm. This ensures that the malt extraction rate and enzymatic hydrolysis effect are uniform during the saccharification process. Grading and screening is a key process to ensure the uniformity of malt product quality, which is directly related to the stability of the subsequent beer brewing process and the consistency of the final product quality.

[0004] Currently, vibrating grading screens are commonly used for beer malt grading and screening. This equipment mainly consists of a frame, a vibration mechanism, a transmission mechanism, and a screen cleaning device. The screen is driven by the vibration mechanism, which causes the material to move on the screen surface. During the grading process, smaller particles adhere closely to the screen surface and quickly pass through the screen holes, while larger particles move towards the discharge end until they are discharged from the machine, thereby achieving the grading of malt of different particle sizes.

[0005] However, existing vibrating grading screens still have prominent technical problems when applied to beer malt grading. Because beer malt particles are irregular in shape and have sharp edges, they are very easy to embed and get stuck in the screen holes. As a result, the screen holes of the second and third layers of screens often become severely blocked during the grading process, preventing the material from passing through and causing a sharp drop in grading efficiency. This requires frequent shutdowns for manual cleaning, which seriously affects the continuous operation efficiency and grading accuracy of the grading process.

[0006] In addition, most existing screen cleaning devices are contact scraping cleaning structures, and the screen aperture is fixed during the cleaning process. This results in limited cleaning effect of traditional cleaning structures and easy damage to the screen during the cleaning process, which shortens the screen's service life. Therefore, how to effectively solve the problem of screen hole clogging in rotary grading screens for beer malt grading has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] In view of the above problems, embodiments of the present invention provide a beer malt grading and screening device and process to solve the aforementioned technical problems.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides a beer malt grading and screening device, including a vibrating bed, a screening chamber fixedly installed on the vibrating bed, and a plurality of screening mechanisms arranged vertically inside the screening chamber. The screening mechanisms are used to continuously screen malt particles and perform online clogging.

[0009] The screening mechanism includes a conveyor belt assembly mounted on a vibrating bed. Several screen frames are evenly spaced on the conveyor belt assembly, and several steel wire ropes arranged longitudinally and transversely are mounted on the screen frames through a tensioning structure.

[0010] Several steel wire ropes arranged in a longitudinal and transverse manner are combined to form a screen structure. Malt particles are screened through the mesh formed by the combination of longitudinal and transverse steel wire ropes. The steel wire ropes located above the conveyor belt assembly are taut, and the mesh size formed by the taut steel wire ropes is a specified value and is used for screening.

[0011] The steel wire rope located at the bottom of the conveyor belt assembly is relaxed under the action of the tensioning structure. The mesh formed by the relaxed steel wire rope is larger than the specified value and is used to clear blockages.

[0012] Preferably, the conveyor belt assembly includes two pulleys arranged side by side and rotatably connected inside the screening chamber, with a synchronous belt wound around the two corresponding pulleys.

[0013] Preferably, the screen frame is fixedly connected to the outside of the timing belt, and rotated to fit tightly together with the screen frame on the upper side of the timing belt.

[0014] Preferably, the tensioning structure includes a plurality of wedge-shaped blocks fixedly installed on the screen frame, the wedge-shaped blocks being arranged on two adjacent sides of the screen frame.

[0015] Preferably, a connecting block is slidably connected to the wedge surface of the wedge block, and a linkage plate is fixedly installed on the connecting block on the same side. The linkage plate is inserted into the wire rope, and the other end of the wire rope is locked to the screen frame.

[0016] Preferably, a threaded rod is rotatably provided on the screen frame, and a sliding seat is threadedly connected to the threaded rod. The sliding seat is hinged to the two linkage plates by connecting rods.

[0017] Preferably, a plurality of inverted V-plates are fixedly installed on the screening chamber, the inverted V-plates are located in the middle of the corresponding conveyor belt assembly, and guide plates are fixedly installed on the front and rear sides of the screening chamber to guide the malt that passes through the upper screen structure to the lower screen structure.

[0018] Preferably, the end of the threaded rod is a hexagonal prism structure with a chamfer, and a linear rotary motor is installed on the lower side of the inverted V-plate via an electric slider. The linear rotary motor is used to rotate the threaded rod.

[0019] Preferably, the upper side of the screen frame is threaded with a plurality of fastening screws for locking the wire rope, and a cover plate for covering the fastening screws is detachably installed on the upper side of the screen frame.

[0020] The second aspect of the present invention provides a beer malt grading and screening process, the specific screening method steps are as follows: S1, the malt particles to be screened are put into the top of the screening chamber, and the vibrating bed and all the conveyor belt assemblies are started, so that the conveyor belt assembly drives the screen frame on it to rotate, and the malt particles are laid in the screen frame located on the upper part of the conveyor belt assembly under the vibration.

[0021] S2. The steel wire rope inside the screen frame on the upper side of the conveyor belt assembly is taut under the action of the tensioning structure, forming a specified mesh, so that the malt particles pass through the mesh under the vibration of the vibrating bed to achieve grading and screening.

[0022] S3. After the screen frame has completed screening, it rotates to the lower side with the conveyor belt assembly. The tensioning structure makes the steel wire rope inside the screen frame slack, and the combined mesh enlarges. The malt particles stuck on the steel wire rope automatically fall off under the action of gravity and vibration, completing the online unblocking.

[0023] S4. After the steel wire rope is loosened and cleared, it is tightened again by the tensioning structure. Then the screen frame continues to rotate with the conveyor belt assembly and returns to the upper side, so that the steel wire rope participates in screening again, realizing continuous cycle operation. The oversize and undersize materials of each level are discharged from the corresponding outlet of the screening chamber.

[0024] The beneficial effects of this invention are as follows: First, this invention uses a conveyor belt assembly to drive the screen frame and wire rope on it to move continuously, so that the wire rope rotating to the upper part of the conveyor belt assembly is kept taut under the action of the tensioning structure. The mesh formed by these wire ropes allows the malt particles to pass through. When the screen frame and wire rope continue to rotate to the lower part with the conveyor belt assembly, the tensioning structure makes the wire rope slack, and the mesh enlarges accordingly. The malt particles stuck on the wire rope automatically fall off under the action of gravity and the vibration of the vibrating bed, completing the online unblocking. In this way, the screening and unblocking processes are carried out synchronously and continuously in different stroke sections of the conveyor belt assembly, and the screen can be self-cleaned without stopping the machine, which greatly improves the continuous operation efficiency and screening accuracy of grading and screening.

[0025] Second, this invention employs several steel wire ropes arranged longitudinally and transversely on a sieve frame. These steel wire ropes are combined to form a sieve structure, and the gaps between the steel wire ropes form mesh holes through which malt particles are sieved. At the same time, the steel wire ropes in several sieve mechanisms arranged vertically and vertically are combined to form mesh holes of different sizes, thereby classifying the malt particles into three grades: large, medium, and small. In this way, the steel wire ropes achieve precise grading and can also dynamically adjust the mesh size by changing their tension. The structure is simple and efficient.

[0026] Third, the present invention uses a linear rotary motor to rotate the threaded rod that rotates to the lower part of the synchronous belt. The threaded rod drives the sliding seat to move through the thread. The sliding seat pushes the linkage plate through the hinged connecting rod, so that the linkage plate drives the connecting block to slide along the wedge surface of the wedge block and approach the screen frame. This allows the linkage plate to actively relax the taut steel wire rope, thereby expanding the mesh to achieve unblocking. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional view of the screening chamber, screen frame, conveyor belt assembly and guide plate in this invention; Figure 3 This is a partial cross-sectional view of the inverted V-plate, pulley, timing belt, and guide plate components in this invention; Figure 4 This is a schematic diagram of the structure of the screen frame, linkage plate, cover plate and threaded rod in this invention; Figure 5 This is a top view of the screen frame and wire rope in this invention; Figure 6 This is a schematic diagram of the structure of the screen frame, wire rope, linkage plate and connecting rod in this invention; Figure 7 This is a partial structural schematic diagram of the linkage plate, connecting rod, and sliding seat in this invention; Figure 8 This is a schematic diagram of the structure of the wedge block, the linkage plate, and the connecting block in this invention; Figure 9 This is a partial cross-sectional view of the screening chamber, electric slider, linear rotary motor, and threaded rod in this invention.

[0029] In the diagram: 1. Vibrating bed; 2. Screening chamber; 3. Screening mechanism; 21. Inverted V-plate; 22. Guide plate; 23. Electric slider; 24. Linear rotary motor; 31. Conveyor belt assembly; 32. Screen frame; 33. Tensioning structure; 34. Wire rope; 311. Pulley; 312. Synchronous belt; 321. Cover plate; 331. Wedge block; 332. Connecting block; 333. Linkage plate; 334. Threaded rod; 335. Sliding seat; 336. Connecting rod. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0031] SeeFigure 1 and Figure 2 A beer malt grading and screening device includes a vibrating bed 1, a screening chamber 2 fixedly installed on the vibrating bed 1, and several screening mechanisms 3 arranged vertically inside the screening chamber 2. The screening mechanisms 3 are used to continuously screen malt particles and perform online clogging.

[0032] When screening malt particles, the malt particles to be screened are fed into the top of the screening chamber 2, and the vibrating bed 1 and the screening mechanism 3 are started. The malt particles slide down onto the screening mechanism 3 under the action of gravity. The vibration energy of the vibrating bed 1 is transferred to the screening mechanism 3. Under the action of vibration, the screening mechanism 3 classifies and screens the malt particles. At the same time as screening, the screening mechanism 3 clears the malt particles that are blocked on it online.

[0033] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The screening mechanism 3 includes a conveyor belt assembly 31 mounted on the vibrating bed 1. Several screen frames 32 are evenly spaced on the conveyor belt assembly 31. Several steel wire ropes 34 are arranged longitudinally and transversely on the screen frames 32 through a tensioning structure 33. The several steel wire ropes 34 are combined to form a screen structure.

[0034] When screening malt grains, all conveyor belt assemblies 31 are started simultaneously, causing the conveyor belt assemblies 31 to drive the screen frame 32 and wire rope 34 on them to rotate and move until the wire rope 34 located on the upper part of the conveyor belt assembly 31 is in a taut state. The mesh size formed by the taut wire rope 34 is a specified value, and the malt grains are laid on these wire ropes 34 and vibrated through the screen.

[0035] At the same time, the steel wire rope 34, which moves to the lower part of the conveyor belt assembly 31, is relaxed under the action of the tensioning structure 33. In the relaxed state, the mesh formed by the steel wire rope 34 actively expands to a value greater than the specified value. Under the action of vibration, the malt particles blocked on the mesh that are greater than the specified value fall off the steel wire rope 34, thereby clearing the blockage online. The clearing and screening are carried out simultaneously.

[0036] To ensure the continuous flow rate of the wire rope 34 used for screening, the present invention designs the following structure: (See attached diagram) Figure 2 , Figure 3 and Figure 4 The conveyor belt assembly 31 includes two pulleys 311 arranged left and right and rotatably connected inside the screening chamber 2. A synchronous belt 312 is wound around the two corresponding pulleys 311. The screen frame 32 is fixedly connected to the outside of the synchronous belt 312. The screen frame 32 rotates to fit tightly together with the upper side of the synchronous belt 312. In this embodiment, a synchronous motor for driving the pulleys 311 is provided at the rear side of the screening chamber 2.

[0037] When screening malt particles, the synchronous motor is started to rotate pulley 311, which drives the synchronous belt 312 to move continuously. The synchronous belt 312 drives the screen frame 32 on it to move slowly and synchronously. In this embodiment, the moving speed of the screen frame 32 is 0.1-0.2 m / s. In this embodiment, the screen frame 32 located on the upper side of the synchronous belt 312 moves continuously towards the discharge port of the screening chamber 2. Through the continuous movement of the screen frame 32, the screen frame 32 that has rotated to the lower part of the synchronous belt 312 and the wire rope 34 are disengaged from the screening task, while the screen frame 32 that has rotated to the upper part of the synchronous belt 312 and the wire rope 34 begin to participate in the screening task. By replacing the wire rope 34 online in real time, the screening flow rate of the wire rope 34 is guaranteed.

[0038] To achieve tensioning and slackening of the wire rope 34, the present invention designs the following structure: (See attached diagram) Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The tensioning structure 33 includes several wedge blocks 331 fixedly installed on the screen frame 32. The wedge blocks 331 are arranged on two adjacent sides of the screen frame 32. A connecting block 332 is slidably connected to the wedge surface of the wedge block 331. A linkage plate 333 is fixedly installed on the connecting block 332 on the same side. A wire rope 34 is inserted into the linkage plate 333. The other end of the wire rope 34 is locked to the screen frame 32.

[0039] The connecting block 332 located on the upper part of the synchronous belt 312 is positioned away from the screen frame 32, so that the connecting block 332 pulls the wire rope 34 through the linkage plate 333, thereby keeping the wire rope 34 on the upper part of the synchronous belt 312 taut, thus ensuring that the mesh size formed by the taut wire rope 34 is the specified value; conversely, the connecting block 332 located on the lower part of the synchronous belt 312 is positioned close to the screen frame 32, thereby keeping the wire rope 34 on the lower part of the synchronous belt 312 slack.

[0040] To facilitate the replacement of the stretched steel wire rope 34, the present invention is designed with the following structure: (See reference) Figure 4 , Figure 5 and Figure 6 The upper side of the screen frame 32 is threaded with several fastening screws for locking the steel wire rope 34, and the upper side of the screen frame 32 is detachably equipped with a cover plate 321 for covering the fastening screws.

[0041] When the wire rope 34 is stretched beyond the specified value, the cover plate 321 is removed and the corresponding fastening screws are loosened. Then the wire rope 34 is pulled out and a new wire rope 34 is replaced to the specified position. The fastening screws are tightened to press one end of the wire rope 34 onto the screen frame 32. In this embodiment, the wire rope 34 is made of high-strength material and the replacement cycle of the wire rope 34 is 1500-2000 hours.

[0042] To facilitate the movement of the linkage plate 333 and the adjustment of the tension of the wire rope 34, the present invention designs the following structure: (See attached diagram) Figure 4 , Figure 6 , Figure 7 and Figure 9 A threaded rod 334 is rotatably mounted on the screen frame 32. A sliding seat 335 is threadedly connected to the threaded rod 334. A connecting rod 336 is hinged between the sliding seat 335 and the two linkage plates 333.

[0043] By rotating the threaded rod 334, the threaded rod 334 drives the sliding seat 335 to move up and down. In this embodiment, when the sliding seat 335 moves away from the screen frame 32, the sliding seat 335 pulls the two linkage plates 333 closer to each other through the connecting rod 336, so that the linkage plates 333 move away from the screen frame 32 through the cooperation of the connecting block 332 and the wedge block 331, thereby making the linkage plates 333 tighten the wire rope 34. Conversely, when the sliding seat 335 moves closer to the screen frame 32, the wire rope 34 is relaxed.

[0044] To facilitate rotation of the threaded rod 334, the present invention designs the following structure: (See reference) Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 9 Several inverted V-plates 21 are fixedly installed on the screening chamber 2. The end of the threaded rod 334 is a hexagonal prism structure with chamfers. A linear rotary motor 24 is installed on the lower side of the inverted V-plates 21 via an electric slider 23. The linear rotary motor 24 is used to rotate the threaded rod 334.

[0045] The linear rotary motor 24 is driven by the electric slider 23 to move synchronously with the threaded rod 334. Then the output shaft of the linear rotary motor 24 is extended and connected to the threaded rod 334. Then the output shaft of the linear rotary motor 24 is rotated, causing it to drive the threaded rod 334 to rotate.

[0046] To facilitate the grading and sieving of malt, the present invention designs the following structure: (See reference) Figure 2 , Figure 3 and Figure 9 The inverted V-plate 21 is located in the middle of the corresponding conveyor belt assembly 31. The front and rear sides of the screening chamber 2 are fixedly installed with guide plates 22 that guide the malt that passes through the upper screen structure to the lower screen structure.

[0047] As the malt grains fall through the mesh formed by the steel wire ropes 34, the inverted V-plate 21 diverts the falling material to the front and rear sides of the screening chamber 2, causing the material to slide into the corresponding guide plate 22. Then, the material in the guide plate 22 slides again onto the next level of steel wire ropes 34, so that the material is guided in an orderly manner to the next layer of screen structure for screening again.

[0048] In addition, the present invention also provides a beer malt grading and screening process, the specific screening process is as follows: S1, the malt particles to be screened are put into the top of the screening chamber 2, and the vibrating bed 1 and all the synchronous belts 312 are started, so that the synchronous belts 312 drive the screen frame 32 on it to rotate, and the malt particles are laid in the screen frame 32 located on the upper part of the synchronous belt 312 under the vibration.

[0049] S2. The steel wire rope 34 inside the screen frame 32 on the upper side of the synchronous belt 312 is taut under the pulling action of the linkage plate 333, forming a specified mesh, so that the malt particles pass through the mesh under the vibration of the vibrating bed 1 to achieve grading and screening.

[0050] S3. The screen frame 32, which has completed the screening, rotates to the lower side with the wire rope 34. The movement of the linkage plate 333 causes the wire rope 34 inside the screen frame 32 to become slack, the mesh size is enlarged, and the malt particles stuck on the wire rope 34 automatically fall off under the action of gravity and vibration, thus completing the online unblocking.

[0051] S4. After the steel wire rope 34 is loosened and cleared, it is tightened again by the rotation of the threaded rod 334. Then the screen frame 32 continues to rotate with the synchronous belt 312 back to the upper side, so that the steel wire rope 34 participates in screening again, realizing continuous cycle operation. The oversize and undersize materials of each level are discharged from the corresponding outlets of the screening chamber 2.

[0052] Compared to traditional grading screens, this invention adds components such as a conveyor belt assembly 31, multiple screen frames 32, and a tensioning structure 33 to the traditional screening structure, which increases the structural complexity and initial cost of the equipment. However, through the synergistic effect of these structures, this invention achieves real-time online unblocking and dynamic screen replacement without stopping the machine during screening. The equipment can maintain continuous and uninterrupted operation. Under the premise of limited cost increase, it significantly improves screening efficiency, reduces maintenance costs, and improves the overall economic benefits of the equipment, thus possessing high practical value and broad application prospects.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this invention, unless otherwise explicitly 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A beer malt grading and screening device, comprising a vibrating bed, wherein a screening chamber is fixedly installed on the vibrating bed, characterized in that, The screening chamber is equipped with several screening mechanisms arranged vertically, which are used to continuously screen malt particles and perform online clogging. The screening mechanism includes a conveyor belt assembly mounted on a vibrating bed, with several screen frames evenly spaced on the conveyor belt assembly, and several steel wire ropes arranged longitudinally and transversely on the screen frames through a tensioning structure. Several steel wire ropes arranged in a longitudinal and transverse manner are combined to form a screen structure. Malt particles are screened through the mesh formed by the combination of the steel wire ropes. The steel wire ropes located above the conveyor belt assembly are taut. The mesh size formed by the taut steel wire ropes is a specified value and is used for screening. The steel wire rope located at the bottom of the conveyor belt assembly is relaxed under the action of the tensioning structure. The mesh formed by the relaxed steel wire rope is larger than the specified value and is used to clear blockages.

2. The beer malt grading and screening device according to claim 1, characterized in that, The conveyor belt assembly includes two pulleys arranged side by side and rotatably connected inside the screening chamber, with a synchronous belt wound around the two corresponding pulleys.

3. The beer malt grading and screening device according to claim 2, characterized in that, The screen frame is fixedly connected to the outside of the synchronous belt, and rotates to fit tightly together with the screen frame on the upper side of the synchronous belt.

4. The beer malt grading and screening device according to claim 1, characterized in that, The tensioning structure includes several wedge-shaped blocks fixedly installed on the screen frame, with the wedge-shaped blocks arranged on two adjacent sides of the screen frame.

5. The beer malt grading and screening device according to claim 4, characterized in that, A connecting block is slidably connected to the wedge-shaped surface of the wedge block, and a linkage plate is fixedly installed on the connecting block on the same side. The linkage plate is inserted into the wire rope, and the other end of the wire rope is locked to the screen frame.

6. The beer malt grading and screening device according to claim 5, characterized in that, A threaded rod is rotatably mounted on the screen frame, and a sliding seat is threadedly connected to the threaded rod. The sliding seat is hinged to two linkage plates by connecting rods.

7. A beer malt grading and screening device according to claim 6, characterized in that, Several inverted V-plates are fixedly installed on the screening chamber. The inverted V-plates are located in the middle of the corresponding conveyor belt assembly. Guide plates are fixedly installed on the front and rear sides of the screening chamber to guide the malt that passes through the upper screen structure to the lower screen structure.

8. A beer malt grading and screening device according to claim 6, characterized in that, The end of the threaded rod is a hexagonal prism structure with a chamfer. A linear rotary motor is installed on the lower side of the inverted V-plate via an electric slider. The linear rotary motor is used to rotate the threaded rod.

9. A beer malt grading and screening device according to claim 1, characterized in that, The upper side of the screen frame is threaded with several fastening screws for locking the steel wire rope, and a cover plate for covering the fastening screws is detachably installed on the upper side of the screen frame.

10. A beer malt grading and screening process, employing the beer malt grading and screening device according to any one of claims 1 to 9, characterized in that, The specific screening method and steps are as follows: S1. The malt grains to be screened are fed into the top of the screening chamber, and the vibrating bed and all the conveyor belt assemblies are started, so that the conveyor belt assemblies drive the screen frame on them to rotate, and the malt grains are laid in the screen frame located above the conveyor belt assembly under the action of vibration. S2. The steel wire rope inside the screen frame on the upper side of the conveyor belt assembly is taut under the action of the tensioning structure, forming a specified mesh, so that the malt particles pass through the mesh under the vibration of the vibrating bed to achieve grading and screening. S3. The screen frame that has completed screening rotates to the lower side with the conveyor belt assembly. The tensioning structure makes the steel wire rope in the screen frame turn to a relaxed state, the combined mesh enlarges, and the malt particles stuck on the steel wire rope automatically fall off under the action of gravity and vibration, completing the online unblocking. S4. After the steel wire rope is loosened and cleared, it is tightened again by the tensioning structure. Then the screen frame continues to rotate with the conveyor belt assembly and returns to the upper side, so that the steel wire rope participates in screening again, realizing continuous cycle operation. The oversize and undersize materials of each level are discharged from the corresponding outlet of the screening chamber.

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