Device and method for reducing the return of the filter cloth on the belt, belt conveyor apparatus

Abstract

The application provides a device for reducing return belt material of filter cloth, a belt conveyor equipment and a method for reducing return belt material of filter cloth. The device for reducing return belt material of filter cloth comprises a cutting piece and a support, the support is connected with the cutting piece and used for enabling the cutting piece to be located above the filter cloth, the cutting piece is used for moving towards and away from the filter cloth relative to the support, so that the cutting piece cuts the material on the filter cloth in the movement direction of the filter cloth. The device for reducing return belt material of filter cloth cuts the material, improves the water absorption efficiency of the gypsum cake, reduces the amount of the gypsum cake adhered to the filter cloth, and facilitates the falling of the cut material, and further reduces the problem of return belt material.

Description

Technical Field

[0001] This invention belongs to the technical field of desulfurized gypsum dewatering system, specifically relating to a device, belt conveyor equipment, and method for reducing filter cloth return material. Background Technology

[0002] In the desulfurized gypsum dewatering system, the core equipment is the vacuum dewatering belt conveyor. During the gypsum dewatering process, the gypsum slurry is dewatered by the belt conveyor and becomes gypsum cake with a low moisture content. The qualified gypsum cake falls into the gypsum silo under its own gravity during the return trip of the filter cloth on the belt conveyor. During the return trip of the filter cloth, it carries a significant amount of gypsum cake (in some sites, the weight of the gypsum cake carried by the filter cloth is 15%-30% of the total weight). These gypsum cakes are ultimately carried back to the filter cloth washing system.

[0003] Because the filter cloth carries too much gypsum, the efficiency of gypsum cake discharge is relatively low. At the same time, it increases the energy consumption of the subsequent dewatering system of the belt conveyor, increases the load of filter cloth washing water, and also increases the risk of filter cloth clogging.

[0004] Currently, methods such as adding scrapers and blades can reduce the amount of gypsum cake carried back during the return trip. While these methods are effective in reducing the amount of gypsum cake carried back, several issues remain. For example, the scraper needs a clearance with the filter cloth during operation. If the clearance is too large, the carried gypsum cake cannot be completely scraped off; if the clearance is too small, excessive scraping and damage to the filter cloth can occur. Furthermore, during the scraping process, fine gypsum particles are evenly spread across the filter cloth, increasing the difficulty of rinsing and the risk of clogging. Therefore, the effectiveness of these methods in resolving the issue of gypsum cake sticking to the filter cloth and being carried back during the return trip needs further improvement.

[0005] Therefore, it is necessary to design a device, belt conveyor, and method to reduce filter cloth return material carrying capacity in order to improve the effect of reducing return material carrying capacity. Summary of the Invention

[0006] To address some or all of the aforementioned technical problems in the prior art, this invention proposes a device, a belt conveyor, and a method for reducing filter cloth return material carryover. In this device, the material is cut, which improves the efficiency of water absorption by the gypsum cake, reduces the amount of gypsum cake adhering to the filter cloth, and the cut material is easily detached, further reducing the problem of return material carryover.

[0007] According to one aspect of the present invention, an apparatus for reducing material carryback on filter cloth is provided, comprising a cutter and a support, the support being connected to the cutter for positioning the cutter above the filter cloth, the cutter being configured to move toward and away from the filter cloth relative to the support, such that the cutter cuts the material on the filter cloth.

[0008] In one embodiment, the cutting element is constructed as a rod-shaped member, and multiple cutting elements are spaced apart to form a cutting curtain, the cutting curtain being connected end to end to form a cutting ring; the support includes a first roller, a second roller, a first bracket, and a second bracket, two first brackets being respectively mounted on the axial ends of the first roller, the first roller being rotatably connected relative to the first bracket; the second roller is arranged axially parallel to and spaced apart from the first roller, two second brackets being respectively mounted on the axial ends of the second roller, the second roller being rotatably connected relative to the second bracket, wherein the cutting element surrounds the first roller and the second roller, and the length direction of the cutting element is consistent with the axial direction of the first roller.

[0009] In one embodiment, a first support roller is fixedly connected between two first supports, the first support roller passing through the first roller in a sleeve manner; a second support roller is fixedly connected between two second supports, the second support roller passing through the second roller in a sleeve manner; and a first bearing is provided between the first support roller and the first roller; and a second bearing is provided between the second support roller and the second roller.

[0010] In one embodiment, the cutting element is constructed as a circular rod with a circular cross-section.

[0011] In one embodiment, the diameter of the cutting element is 1.5 mm to 3 mm; the spacing between adjacent cutting elements is 15 mm to 50 mm; and the spacing between the first roller and the second roller is 2 m to 3 m.

[0012] According to a second aspect of the present invention, a belt conveyor is provided, comprising:

[0013] belt conveyor

[0014] The above-mentioned device for reducing filter cloth return material.

[0015] The support is fixed relative to the base of the belt conveyor, and the cutting element is located above the filter cloth of the belt conveyor.

[0016] In one embodiment, the first and second rollers of the device for reducing filter cloth return material cross the filter cloth and abut against the filter cloth, and a portion of the cutting ring abuts against the filter cloth and moves synchronously with the filter cloth.

[0017] In one embodiment, one of the first roller and the second roller is adjacent to the material distribution trough of the belt conveyor, and the other is away from the material distribution trough and relatively close to the discharge port of the belt conveyor.

[0018] In one embodiment, the extending direction of the cutting element is perpendicular to the movement direction of the filter cloth.

[0019] According to a third aspect of the present invention, a method for reducing filter cloth return material carryover is provided, comprising:

[0020] Step 1: Debug the belt conveyor equipment described above.

[0021] Step two: The conveyor belt is used to load materials onto the filter cloth.

[0022] During the material conveying process of the filter cloth, the cutting element moves to cut the material.

[0023] Compared with existing technologies, the advantages of this invention are as follows: During the conveyor belt transport of gypsum, the material on the filter cloth is cut by the cutting component to break up the gypsum cake, making it easier for water in the gypsum to pass through the filter cloth and drain outwards. This allows the gypsum cake to dry relatively quickly, thereby reducing its stickiness and making it easier to remove from the filter cloth. Furthermore, the cutting component can divide the gypsum cake into smaller pieces, which are more likely to fall off naturally, fundamentally reducing the likelihood of material being carried back onto the filter cloth. Attached Figure Description

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram showing an application of a device for reducing filter cloth return material according to an embodiment of the present invention to a belt conveyor;

[0026] Figure 2 for Figure 1 Enlarged view of the device for reducing filter cloth return material and part of the belt conveyor;

[0027] Figure 3 A portion of a device for reducing filter cloth return material carryover according to an embodiment of the present invention is shown;

[0028] Figure 4 The image shows the state of the cutting element on the filter cloth in the device for reducing filter cloth return material;

[0029] Figure 5 A top view of the filter cloth carrying the material is shown;

[0030] Figure 6 The effect of cutting open the gypsum layer is shown in the application of two embodiments of the device for reducing filter cloth return material.

[0031] In the accompanying drawings, the same parts are represented by the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0032] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0033] Embodiments of the present invention provide a device for reducing material carryover during filter cloth return. For example... Figures 1 to 5 As shown, the device 100 for reducing filter cloth return material includes a cutter 110 and a support 120. The support 120 is connected to the cutter 110 and provides support for the cutter 110. During operation, the support 120, carrying the cutter 110, is positioned above the filter cloth 210 of the belt conveyor 200. The cutter 110 can move relative to the support 120, moving towards and away from the filter cloth 210, thereby cutting the material on the filter cloth 210.

[0034] As can be seen, during the conveyor belt 200's transport of gypsum, the cutting element 110 cuts the material on the filter cloth 210 to break up the filter cake formed on the filter cloth. This allows water in the gypsum to more easily pass through the filter cloth 210 and be drained outwards, reducing the gypsum cake's stickiness and making it easier for it to detach from the filter cloth 210. Furthermore, the cutting element 110 can cut the gypsum cake into smaller pieces, which are more likely to detach naturally from the filter cloth 210, improving the effect of reducing material carryover during filter cloth return.

[0035] In the first embodiment, the cutting element 110 can be configured as a cutting blade. The support 120 can be configured as a hydraulic or pneumatic cylinder capable of repetitive linear motion. The end of the cutting element 110 opposite to the cutting edge is mounted to the extension rod of the hydraulic or pneumatic cylinder. In application, the cylinder body of the hydraulic or pneumatic cylinder is fixed to the base of the conveyor belt 200, causing the cutting element 110 to suspend above the filter cloth 210, with the cutting edge along the transverse direction of the filter cloth (perpendicular to the direction of movement of the filter cloth 210, i.e., the length direction). Figure 1 (The direction is consistent with the front and back directions). During the process of conveying gypsum through the filter cloth 210 ( Figure 1The middle arrow indicates that the working section of the filter cloth 210 moves from left to right to transport gypsum. A hydraulic cylinder or pneumatic cylinder drives the cutting element 110 towards the filter cloth to cut the material in the direction of its movement. Afterwards, the hydraulic cylinder or pneumatic cylinder drives the cutting element 110 to reset for the next cut. It is easy to understand that multiple cutting elements 110 can be set, spaced apart along the length of the filter cloth 210, to improve efficiency. The depth to which the cutting element 110 can cut the gypsum can be adjusted by adjusting the stroke of the hydraulic cylinder or pneumatic cylinder. Along the length of the filter cloth 210, the cutting element 110 is positioned 2 to 3 meters away from the material distribution trough of the belt conveyor 200, i.e., where the gypsum has initially formed a gypsum cake and water is unlikely to continue flowing out. Therefore, in this embodiment, the cutting element 110 can cut the gypsum cake from top to bottom. It should be noted that although the above embodiment is not illustrated in the text, those skilled in the art can foresee its functionality based on the description.

[0036] In the second embodiment, the cutting element 110 is constructed as a rod-shaped member. Multiple cutting elements 110 are spaced apart to form a cutting curtain. It is readily understood that the multiple cutting elements are arranged axially parallel, and are secured together using an object such as a connecting rope, like stringing together a bamboo curtain, thus forming a cutting curtain. The ends of the cutting curtain are connected to form a cutting ring.

[0037] Meanwhile, the support 120 includes a first roller 121, a second roller 122, a first bracket 123, and a second bracket 124. Two first brackets 123 are respectively mounted at both axial ends of the first roller 121 to support it. The first roller 121 is rotatably connected relative to the first bracket 123. The second roller 122 is spaced apart from the first roller 121, and their axes are parallel. Two second brackets 124 are respectively mounted at both axial ends of the second roller 122, providing support and constraint for it. The second roller 122 is rotatably connected relative to the second bracket 124. The cutting element 110 surrounds the first roller 121 and the second roller 122, and its length direction is consistent with the axial direction of the first roller 121. The cutting ring, the first roller 121, and the second roller 122 form a structure similar to a belt drive.

[0038] A first support roller 125 is fixedly connected between two first supports 123. The first support roller 125 passes through the first roller 121 in a sleeve-like manner. Simultaneously, a second support roller 126 is fixedly connected between two second supports 124. The second support roller 126 passes through the second roller 122 in a sleeve-like manner. A first bearing 127 is provided between the first support roller 125 and the first roller 121. A second bearing 128 is provided between the second support roller 126 and the second roller 122. By providing the first bearing 127, the friction between the first support roller 125 and the first roller 121 is reduced, preventing wear. There can be two first bearings 127 located at both axial ends of the first roller 121. By providing the second bearing 128, the friction between the second support roller 126 and the second roller 122 is reduced, preventing wear. For example, there can also be two second bearings 128, each located at one axial end of the second roller 122.

[0039] The cross-section of the cutting element 110 can be circular, square, elliptical, etc. However, the cross-section of the cutting element 110 is preferably circular. When the circular cutting element 110 comes into contact with the filter cloth, it is gentle on the filter cloth and can prevent the filter cloth from being scratched.

[0040] The diameter of the cutting element 110 is 1.5 mm to 3 mm, for example, 1.5 mm, 2 mm, or 3 mm. This setting is based on the standard that the cutting element 110 can cut through plaster cakes. The spacing between adjacent cutting elements 110 is 15 mm to 50 mm, for example, 15 mm, 20 mm, 25 mm, 30 mm, or 50 mm. The spacing between adjacent cutting elements 110 is mainly set to ensure that the rollers do not trap plaster. The material of the cutting element 110 can be stainless steel. The spacing between the first roller 121 and the second roller 122 is 2 meters to 3 meters, for example, 2 meters, 2.5 meters, or 3 meters. After the filter cloth return material reduction device 100 is installed, the rollers (first roller 121 or second roller 122) near the material distribution trough 230 can be as close to the material distribution trough 230 as possible, but without wear or impact on the rollers. This ensures that when the gypsum slurry falls, it can wash the rotating cutting piece 110, cleaning the spoke cutting piece 110. The distance between the first roller 121 and the second roller 122 ensures that the rollers away from the material distribution trough 230 are located in the area where the gypsum cake has not completely solidified, so as to effectively cut the gypsum cake.

[0041] This application also relates to belt conveyor equipment and a method for reducing filter cloth return material. The belt conveyor equipment includes a belt conveyor 200 and the aforementioned device 100 for reducing filter cloth return material. It is evident that the device 100 for reducing filter cloth return material in both embodiments can be applied to the belt conveyor 200, and the material can be cut using the cutting element 110 during the material conveying process of the filter cloth 210. In the method for reducing filter cloth return material, the belt conveyor equipment first needs to be debugged, mainly by applying the device 100 to the belt conveyor 200. Then, the material on the belt conveyor 200 is placed onto the filter cloth 210. During the material conveying process of the filter cloth, the cutting element 110 moves to cut the material. The first embodiment (the cutting element 110 is constructed as a cutter) applied to the belt conveyor 200 has already been described above; the following focuses on describing the second embodiment (the cutting element 110 is constructed as a rod-shaped member) applied to the belt conveyor 200. In this application, no other technical improvements are made to the belt conveyor 200, that is, the belt conveyor 200 can be a dewatering belt conveyor in the prior art.

[0042] Specifically, the first bracket 123 and the second bracket 124 of the support 120 are fixed to the base 220 of the belt conveyor 200 to limit the position of the device 100 for reducing the return material of the filter cloth, thereby ensuring the cutting effect of the cutting ring 110 on the gypsum cake. After fixing, the cutting element 110 is located above the filter cloth 210 of the belt conveyor 200. More specifically, after installation, the first roller 121 and the second roller 122 span across the filter cloth 210. In the vertical direction, the first roller 121 and the second roller 122 abut against the filter cloth 210, and drive part of the cutting element 110 in the cutting ring (the part located between the first roller 121 and the second roller 122 and close to the filter cloth 210) to abut against the filter cloth 210 and move synchronously with the filter cloth 210. Along the length of the filter cloth 210, one of the first roller 121 and the second roller 122 is adjacent to the material distribution trough 230 of the conveyor belt 210, while the other is positioned downstream of the material flow, away from the material distribution trough 230 and relatively close to the discharge port 240. In the transverse direction of the filter cloth 210, the cutting element 110 extends perpendicularly to the direction of movement of the filter cloth 210, and is used to cut the gypsum cake along its length. In the method of reducing the return material load on the filter cloth, the conveyor belt equipment is first adjusted, that is, the device 100 for reducing the return material load on the filter cloth is installed on the conveyor belt 200. After installation, a portion of the cutting element 110 abuts against the filter cloth 210. Then, material handling begins on the conveyor belt 200. Gypsum slurry material is piled onto the filter cloth 210 through the gypsum slurry discharge end at the material distribution trough 230. During the material conveying process of filter cloth 210, the filter cake formed on filter cloth 210 is cut by cutting element 110 to cut the gypsum cake into multiple parts along the length of filter cloth 210. Finally, the gypsum cake is discharged from the gypsum cake discharge end of filter cloth 210.

[0043] Taking the second embodiment as an example, the first roller 121 and the second roller 122 are attached to the filter cloth 210. Plaster slurry falls from the material distribution tank 230 onto the filter cloth, and the portion of the cutting piece 110 that abuts against the filter cloth 210 can be immersed in the plaster slurry. As the moisture in the plaster slurry is absorbed and the slurry gradually solidifies, it drives the cutting piece 110 to move downstream along with the filter cloth 210. The movement of the cutting piece 110 can cause the first roller 121 to rotate relative to the first support 123, and drive the second roller 122 to rotate relative to the second support 124. After the surface moisture of the plaster cake is absorbed, the cutting piece 110 has rotated to the downstream roller, and after the downstream roller reverses direction and rotates back and forth, the cutting piece 110 moves upward from the part attached to the filter cloth 210, cutting open the undried plaster cake. Since there are multiple cutting pieces 110, which can be arranged at equal intervals (it's easy to understand that the cutting pieces 110 can be arranged at equal or unequal intervals), the plaster cake is also relatively evenly cut into equal-distance channels from bottom to top. At this time, the moisture in the upper layer of the plaster cake moves rapidly downward along the channels and is absorbed. Through the reciprocating movement of the cutting pieces 110, the dense plaster cake with upper and lower layers can be cut apart, so that the plaster cake can be quickly dehydrated. Before falling into the discharge port 240, the plaster cake is divided into small portions perpendicular to the rotation direction of the filter cloth 210, which ultimately facilitates the natural detachment of the plaster cake and fundamentally reduces the situation of material carrying back on the filter cloth.

[0044] It should be noted that when two different devices for reducing filter cloth return material are applied to the belt conveyor 200, in the first embodiment (the cutting element 110 is constructed as a cutter), the cutting element 110 cuts the plaster cake from top to bottom, while in the second embodiment (the cutting element 110 is constructed as a rod), the cutting element 110 cuts the plaster cake from bottom to top. Figure 6 As shown, when scraping the plaster cake into layers from top to bottom, the pressure applied to the plaster cake and filter cloth 210 is relatively high, which can easily lead to incomplete scraping. Figure 6 The left side shows the process. When cutting through the plaster cake from bottom to top, the dense barrier is broken through, as shown... Figure 6 As shown on the right. It can be seen that, comparing the two devices for reducing filter cloth return material in this application, the structure of the first embodiment (the cutting element 110 is constructed as a cutter) is relatively simple, but the effect of reducing return material is relatively poor, while the structure of the second embodiment (the cutting element 110 is constructed as a rod-shaped element) is relatively complex, but the effect of reducing return material is better.

[0045] Experiments revealed that during the operation of the belt conveyor, after the gypsum slurry completed dehydration, the gypsum cake exhibited stratification. Analysis of the layered gypsum cake showed that the lower layer had a higher moisture content than the upper layer, sometimes approximately twice that of the upper layer; the lower layer had a lower calcium sulfate dihydrate content, sometimes around 10%; and the lower layer had a higher calcium sulfite content, often around 10%. This indicates that the lower layer of gypsum cake contained a higher content of relatively small particles and a lower content of considerably larger calcium sulfate dihydrate particles. During the rapid spread of the gypsum slurry across the entire filter cloth and the absorption of moisture, small particles were quickly adsorbed to the bottom (or passed through larger particles to reach the bottom), forming a relatively dense barrier at the bottom (such as...). Figure 6 This process hinders the absorption of moisture. Additionally, the formation of the gypsum cake creates a film on its surface (composed of acid-insoluble substances and other impurities from the gypsum slurry), preventing water from being absorbed downwards and forming a water-retaining layer. This also results in a higher moisture content in the gypsum cake. All these factors contribute to the gypsum cake's layering and adhesion to the filter cloth.

[0046] In this application, the cutting element 110 can cut the plaster cake. In particular, the cutting element 110 in the second embodiment can cut through the dense barrier of small particles in the lower layer of the plaster cake, opening up channels for water to flow downwards. This allows the plaster cake to be dried quickly without delamination, thus preventing it from sticking to the filter cloth. Therefore, the filter cloth return material carrying device 100 of this application can effectively solve the problem of water flow being hindered and the filter cloth sticking due to plaster cake delamination.

[0047] The process of dewatering gypsum slurry to form gypsum cake using belt conveyor 200 is a continuous dewatering process that transforms gypsum from a liquid to a solid state. In this application, after installing the second device 100 to reduce the return material on the filter cloth, a portion of the cutting element 110 abuts against the filter cloth 210, meaning the cutting element 110 is placed at the bottom layer of the gypsum cake (or gypsum slurry). During the process of conveying gypsum through the filter cloth 210 of belt conveyor 200, when it is necessary to cut through the layers, the cutting element 110 moves from bottom to top, cutting through the dense barrier to achieve the purpose of unblocking the downward flow channel of water.

[0048] In the second embodiment of this application, to allow the cutting element 110 to reciprocate without adding an additional power source, the filter cloth return material carrying device 100 is constructed as similar to continuous rolling wheel spokes. Driven by the filter cloth 210, the cutting curtain moves at a constant speed.

[0049] This application improves upon the process before gypsum cake formation, addressing the issues of high gypsum moisture content, stratification, and high viscosity at the front end of the material flow. It also resolves the problem of excessive wear on the filter cloth caused by passive scraping by the rear scraper. Furthermore, this solution causes no damage to the filter cloth or gypsum cake, making it both economical and environmentally friendly. It effectively reduces the amount of gypsum carried back by the filter cloth on the dewatering conveyor belt, ultimately improving gypsum discharge efficiency and extending the service life of the conveyor belt's filter cloth.

[0050] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the invention, and all changes and / or modifications made according to embodiments of the invention should be covered within the protection scope of the invention.

Claims

1. An apparatus for reducing the amount of filter cloth carried back by the strip, characterized in that The device includes a cutter and a support. The support connects the cutter so that the cutter is positioned above a filter cloth. The cutter moves relative to the support towards and away from the filter cloth to cut the material on the filter cloth from bottom to top. The cutter is constructed as a rod, and multiple cutters are spaced apart to form a cutting curtain. The cutting curtain is connected end to end to form a cutting ring. The support includes a first roller, a second roller, a first bracket, and a second bracket. There are two first brackets, each mounted at one end of the axial direction of the first roller, and the first roller is rotatably connected relative to the first bracket. The second roller is spaced apart and parallel to the axial direction of the first roller. There are two second brackets, each mounted at one end of the axial direction of the second roller, and the second roller is rotatably connected relative to the second bracket. The cutter surrounds the first roller and the second roller, and the length direction of the cutter is consistent with the axial direction of the first roller.

2. The apparatus of claim 1 wherein, A first support roller is fixedly connected between the two first supports, and the first support roller passes through the first roller in a sleeve manner; a second support roller is fixedly connected between the two second supports, and the second support roller passes through the second roller in a sleeve manner; and a first bearing is provided between the first support roller and the first roller; and a second bearing is provided between the second support roller and the second roller.

3. The apparatus of claim 1 or 2, wherein, The cutting component is constructed as a circular rod with a circular cross-section.

4. The apparatus of claim 3 wherein, The diameter of the cutting element is 1.5 mm to 3 mm; the spacing between adjacent cutting elements is 15 mm to 50 mm; the spacing between the first roller and the second roller is 2 m to 3 m.

5. A belt conveyor apparatus, characterized by include: belt conveyor The apparatus for reducing filter cloth return material according to any one of claims 1 to 4, The support is fixed relative to the base of the belt conveyor, and the cutting element is located above the filter cloth of the belt conveyor.

6. The belt conveyor apparatus of claim 5, wherein, The first and second rollers of the device for reducing filter cloth return material cross the filter cloth and abut against the filter cloth, and a portion of the cutting ring abuts against the filter cloth and moves synchronously with the filter cloth.

7. The belt conveyor apparatus of claim 6, wherein, One of the first roller and the second roller is adjacent to the material distribution trough of the belt conveyor, and the other is away from the material distribution trough and relatively close to the discharge port of the belt conveyor.

8. The belt conveyor equipment according to any one of claims 5 to 7, characterized in that, The cutting element extends in a direction perpendicular to the direction of movement of the filter cloth.

9. A method of reducing the return of filter cloth with the strip, characterized in that, include: Step 1: Debug the belt conveyor equipment according to any one of claims 5 to 8. Step two: The conveyor belt is used to load materials onto the filter cloth. During the material conveying process of the filter cloth, the cutting element moves to cut the material.

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