Sectional type screen

Abstract

The utility model relates to the technical field of screw pressing dehydration, in particular to a sectional type screen which comprises a cylindrical shell, the inner wall of the shell is divided into two sections in the radial direction, the section close to a discharging port is a wear-resisting section, and the section close to a middle-section screen set is a flow guide section. A wear-resisting plate is detachably arranged on the wear-resisting section, a plurality of flow guiding plates are evenly arranged on the flow guiding section in the circumferential direction of the flow guiding section, and a flow guiding groove is formed between every two adjacent flow guiding plates. The screen group in the high-pressure area is divided into two sections, one section serves as a flow guide section and is used for enabling a liquid phase separated from a material to flow to the middle-section screen group along a flow guide groove during spiral extrusion, and the liquid phase is discharged through filter holes in the middle-section screen group; when the wear-resisting plate is worn, the wear-resisting plate only needs to be detached from the inner wall of the shell, and a new wear-resisting plate is replaced; compared with an existing mode of replacing the whole screen set in the high-pressure area, the maintenance cost and the material cost are lower.

Description

Technical Field

[0001] The utility model relates to the technical field of screw pressure dehydration, in particular to a segmented screen. Background Art

[0002] Kitchen waste usually refers to food waste generated in residents' daily lives, such as leftovers, fruit peels, and vegetable residues in family kitchens. These wastes come from thousands of households, with a huge amount but a relatively scattered distribution. In order to reduce the pollution of kitchen waste to the environment and realize the recycling of resources, kitchen waste can usually be treated by composting, anaerobic digestion, incineration and landfill. For example, our company uses a combination of anaerobic digestion and incineration to treat kitchen waste. The material output from the anaerobic tank is dehydrated by a screw extruder and then incinerated.

[0003] Among them, a screw extruder used is set at an angle, and the discharge port is higher than the feed port. The screw extruder is provided with multiple screen groups, and the screen group located in the discharge section is not provided with filter holes, such as Figure 1 As shown, the screen group includes a screen plate 1, and a plurality of guide grooves 11 are arranged on the inner wall of the screen plate 1; when in use, the material is transported from the feed end to the rear end high pressure zone by the spiral main shaft, and the solid phase is discharged from the discharge port of the screen group after being squeezed in the high pressure zone, and the liquid phase flows along the guide groove to the middle screen group and is discharged from the filter holes on the middle screen group. However, in actual use, the screen group in the high pressure zone is very easy to wear, mainly because the kitchen waste is mixed with some bottles, cans, broken bowls and other objects due to irregular classification, which are mixed with the kitchen waste after being crushed, resulting in the dehydrated kitchen waste containing solid particles such as ceramics, glass, and metal. These solid particles wear the wall of the screen plate 1 under high pressure, and the screen plate usually needs to be replaced once a month, resulting in high maintenance costs. Utility Model Content

[0004] The utility model provides a segmented screen, which can solve the technical problem that the existing screen plate needs to be frequently replaced after being worn, resulting in high maintenance costs.

[0005] This application provides the following technical solutions:

[0006] A segmented screen comprises a cylindrical outer shell, the inner wall of which is divided into two sections along the radial direction, a section close to the discharge port is a wear-resistant section, and a section close to the middle screen group is a guide section; a wear-resistant plate is detachably provided on the wear-resistant section, and a plurality of guide plates are evenly provided on the guide section along its circumferential direction, and guide grooves are formed between adjacent guide plates.

[0007] Beneficial effects:

[0008] 1. The screen group in the high-pressure area is divided into two sections. One section is used as a guide section, which is used to make the separated liquid phase in the material flow along the guide groove to the middle screen group during spiral extrusion, and discharged through the filter holes on the middle screen group; the other section is close to the discharge port and is the most easily worn part. When the wear-resistant plate is worn, it only needs to be removed from the inner wall of the shell and then replaced with a new one; compared with the existing replacement of the entire screen group in the high-pressure area, the maintenance cost and material cost are lower.

[0009] 2. The thickness of the wear-resistant plate can be replaced according to different types of materials or the humidity of the kitchen waste discharged from the anaerobic tank, and then the feeding gap between the wear-resistant plate and the outer circle of the spiral main shaft can be adjusted, thereby expanding the application scope of the screw extruder, which is highly practical; and the replacement and adjustment methods are simple, and the replacement and maintenance costs are low.

[0010] Furthermore, the wear-resistant plates and guide plates are made of wear-resistant steel.

[0011] Beneficial effects: The use of wear-resistant steel can further extend the service life of wear-resistant plates and guide plates; and combined with the structurally improved screen group, the service life is 2-3 times the original, and the maintenance and replacement costs are also greatly reduced.

[0012] Furthermore, the wear-resistant plate and the guide plate have the same thickness.

[0013] Beneficial effect: It ensures the strength of the entire screen group and facilitates smooth material pushing.

[0014] Furthermore, the thickness difference between the wear-resistant plate and the guide plate is less than or equal to 1.5 mm.

[0015] Beneficial effect: When the thickness difference between the two is greater than 1.5 mm, an empty section is likely to appear in the diversion section, making it difficult for the material to be pushed out.

[0016] Further, the length of the wear-resistant plate is shorter than the length of the guide plate.

[0017] Beneficial effect: The wear-resistant plate is more susceptible to wear, and appropriately shortening the length of the wear-resistant plate can further save the cost of replacement materials.

[0018] Furthermore, the length of the wear-resistant plate is 200 mm, and the length of the guide plate is 250 mm.

[0019] Beneficial effect: After research, it was found that the area 200mm away from the screen group in the high-pressure zone is most prone to friction damage. Determining the length of the wear-resistant plate based on the wear area is conducive to accurately saving material costs.

[0020] Furthermore, a feeding gap formed by the wear-resistant plate, the guide plate and the outer circle of the spiral main shaft is less than or equal to 4 mm.

[0021] Beneficial effect: Since the discharge end of the screw extruder is higher than the feed end, when the feeding gap is greater than 4mm, the material is easily pushed back by the baffle at the discharge end, which is easy to affect the discharge speed.

[0022] Furthermore, a plurality of fold edges are distributed on the shell wall along its circumferential direction, and a plurality of fold edges are also distributed on the wear-resistant plate and correspond to the fold edges on the shell wall.

[0023] Beneficial effect: Creased edges are set on the outer shell wall and the wear-resistant plate. Compared with the smooth inner wall surface, each creased edge in the present application can form a thin water guide groove, which is conducive to efficiently separating the liquid squeezed from the material and allowing the liquid to flow out along the water guide groove, thereby improving the dehydration efficiency.

[0024] Furthermore, the outer shell is composed of two semi-circular plates, and a semi-circular wear-resistant plate is arranged on the wear-resistant section of each semi-circular plate; or a plurality of wear-resistant straight plates are arranged on the wear-resistant section of each semi-circular plate, and adjacent wear-resistant straight plates are tightly fitted.

[0025] Beneficial effects: The semicircular wear-resistant plate is used, which is convenient for quick disassembly and assembly; it is composed of several wear-resistant plates, which is convenient for replacing the most seriously worn wear-resistant plates.

[0026] Furthermore, the guide plate is welded to the inner wall of the shell, or the guide plate and the inner wall of the shell are integrally formed.

[0027] Beneficial effects: The guide plate is not prone to wear, and welding is conducive to ensuring the connection strength and connection stability; the guide plate and guide groove can also be directly processed on the inner wall of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the sieve plate structure before improvement;

[0029] Figure 2 This is the right side view of the utility model after the screen is installed;

[0030] Figure 3 for Figure 2 Schematic diagram of the structure of the middle semicircular arc plate;

[0031] Figure 4 It is a right side view of the semicircular arc plate in the third embodiment. DETAILED DESCRIPTION

[0032] The following is further described in detail through specific implementation methods:

[0033] The marks in the drawings of the specification include: screen plate 1, guide groove 11, guide plate 12, shell 2, wear-resistant section 21, guide section 22, folded edge 23, wear-resistant plate 3, wear-resistant straight plate 31, frame 4, ear plate 41, bolt 411.

[0034] Embodiment 1

[0035] like Figure 2-3 As shown, a segmented screen comprises a cylindrical shell 2, on which a plurality of folded edges 23 are distributed along the circumferential direction of the shell wall. In this embodiment, the shell 2 is composed of two semi-arc plates. Specifically, the semi-arc plates are folded by flat plates to form folded edges 23, and then curled to form a semi-arc structure. During installation, two semi-arc frames 4 are used to hold and connect the two semi-arc plates. The fitting surfaces of the two frames 4 are provided with ear plates 41, and the two ear plates 41 are connected by bolts 411. In order to further improve the strength and stability of the connection, the ear plate 41 of each frame 4 is spot welded at one end in contact with the shell wall, so that the semi-arc frames 4 and the semi-arc plates on the same side become a whole.

[0036] like Figure 3 As shown, the inner wall of the shell 2 is divided into two sections along the radial direction, the section near the discharge port is the wear-resistant section 21, and the section near the middle screen group is the diversion section 22. The wear-resistant section 21 is detachably provided with a wear-resistant plate 3. Specifically, in this embodiment, a semi-circular arc-shaped wear-resistant plate 3 is provided on the wear-resistant section 21 of each semi-circular arc plate, and a plurality of folded edges 23 are also distributed on the wear-resistant plate 3, and correspond to the folded edges 23 on the shell wall, and each folded edge 23 can become a small water guide ditch; wherein, in this embodiment, the wear-resistant plate 3 is spot-welded to the inner wall of the shell 2, and more preferably, the wear-resistant plate 3 is spot-welded to the inner wall of the shell 2 around it, so that the connection can not only ensure the strength and stability of the connection, but also facilitate subsequent replacement and disassembly.

[0037] like Figure 3 As shown, a number of guide plates 12 are evenly arranged on the guide section 22 along its circumferential direction, and a guide groove 11 is formed between adjacent guide plates 12. In this embodiment, the guide plate 12 is welded to the inner wall of the shell 2, or the guide plate 12 is integrally formed with the inner wall of the shell 2, that is, the guide plate 12 is directly processed on the inner wall of the shell 2. When used, it can be selected according to actual conditions. The latter is preferred in this embodiment. In order to further improve the service life of the screen group, the wear-resistant plate 3 and the guide plate 12 in this embodiment are both made of wear-resistant steel, and the thickness of the wear-resistant plate 3 and the guide plate 12 is the same. The length of the wear-resistant plate 3 is less than the length of the guide plate 12, which is conducive to saving material costs; more preferably, the length of the wear-resistant plate 3 in this embodiment is 200mm, and the length of the guide plate 12 is 250mm; the inventor found through research that the area 200mm from the discharge port of the high-pressure zone screen group is most prone to friction damage, and determining the length of the wear-resistant plate 3 according to the wear area is conducive to better saving material costs.

[0038] After the segmented screen is installed on the spiral main shaft, the feeding gap formed by the wear-resistant plate 3, the guide plate 12 and the outer circle of the spiral main shaft is less than or equal to 4mm; since the discharge end of the screw extruder is higher than the feed end, when the feeding gap is greater than 4mm, the material is easily pushed back by the baffle at the discharge end; more preferably, the feeding gap in this embodiment is 2mm or 3mm. When in use, the thickness of the wear-resistant plate 3 can also be changed according to different types of materials or the humidity of the kitchen waste discharged from the anaerobic tank, and then the feeding gap between the wear-resistant plate 3 and the outer circle of the spiral main shaft is adjusted, thereby expanding the scope of application of the screw extruder.

[0039] The present application divides the screen group in the high-pressure zone into two sections, one section is used as the guide section 22, which is used to make the separated liquid phase in the material flow along the guide groove 11 to the middle screen group during spiral extrusion, and be discharged through the filter holes on the middle screen group; the other section is close to the discharge port and is the most easily worn part. When the wear-resistant plate 3 is worn, it is only necessary to remove the wear-resistant plate 3 from the inner wall of the outer shell 2 and then replace it with a new wear-resistant plate 3. Compared with the original replacement of the entire screen group in the high-pressure zone, the present application effectively reduces the maintenance cost and material cost; and the thickness of the wear-resistant plate 3 can also be replaced according to different materials, thereby adjusting the feeding gap, which is conducive to expanding the adaptability of the screw extruder.

[0040] Embodiment 2

[0041] The difference between this embodiment and the first embodiment is that the thickness of the wear-resistant plate 3 is inconsistent with that of the guide plate 12, and the thickness of the wear-resistant plate 3 is greater than that of the guide plate 12. Properly increasing the thickness of the wear-resistant plate 3 can also increase the service life of the wear-resistant plate 3; however, the thickness difference between the wear-resistant plate 3 and the guide plate 12 should be less than or equal to 1.5 mm; when the thickness difference between the two is greater than 1.5 mm, two larger feeding gaps appear in the same section of the screen group, and since the discharge end is higher, an empty section is likely to appear in the guide section 22, which makes it difficult for the material to be pushed out.

[0042] Embodiment 3

[0043] The difference between this embodiment and the first embodiment is that Figure 4 As shown, the semicircular wear-resistant plate 3 is composed of a plurality of wear-resistant straight plates 31 . Specifically, a plurality of wear-resistant straight plates 31 are spot-welded on the wear-resistant section 21 of each semicircular shell, and adjacent wear-resistant straight plates 31 are tightly fitted.

[0044] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A segmented screen, characterized in that: It includes a cylindrical outer shell, the inner wall of which is divided into two sections along the radial direction, the section close to the discharge port is a wear-resistant section, and the section close to the middle screen group is a guide section; a wear-resistant plate is detachably provided on the wear-resistant section, and a plurality of guide plates are evenly provided on the guide section along its circumferential direction, and a guide groove is formed between adjacent guide plates.

2. A segmented screen according to claim 1, characterized in that: Wear plates and guide plates are made of wear-resistant steel.

3. A segmented screen according to claim 1 or 2, characterized in that: The wear-resistant plate and the guide plate have the same thickness.

4. A segmented screen according to claim 1, characterized in that: The thickness difference between the wear-resistant plate and the guide plate is less than or equal to 1.5 mm.

5. A segmented screen according to claim 3, characterized in that: The length of the wear-resistant plate is smaller than that of the guide plate.

6. A segmented screen according to claim 5, characterized in that: The length of the wear-resistant plate is 200 mm, and the length of the guide plate is 250 mm.

7. A segmented screen according to claim 6, characterized in that: The feeding gap formed by the wear-resistant plate, the guide plate and the outer circle of the spiral main shaft is less than or equal to 4mm.

8. A segmented screen according to claim 1, characterized in that: A plurality of fold edges are distributed on the shell wall along the circumferential direction thereof, and a plurality of fold edges are also distributed on the wear-resistant plate and correspond to the fold edges on the shell wall.

9. A segmented screen according to claim 8, characterized in that: The shell is composed of two semi-circular plates, and a semi-circular wear-resistant plate is arranged on the wear-resistant section of each semi-circular plate; or a plurality of wear-resistant straight plates are arranged on the wear-resistant section of each semi-circular plate, and adjacent wear-resistant straight plates are tightly fitted.

10. A segmented screen according to claim 1, characterized in that: The guide plate is welded to the inner wall of the shell, or the guide plate and the inner wall of the shell are integrally formed.

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