A mud tank bridge breaking mechanism

Abstract

The present application belongs to the technical field of sewage treatment, and particularly relates to a mud bin bridge breaking mechanism, which comprises a mud bin, a scraper and a tooth plate assembly. The mud bin comprises a cylindrical body and a bottom wall at the bottom of the body, and a discharge port is arranged on the bottom wall. The scraper is rotatably arranged on the inner side of the bottom wall and connected with a driving element arranged below the mud bin. The driving element is configured to drive the scraper to rotate forward or reversely. The scraper comprises a plurality of scraper arms. The tooth plate assembly is in contact with the inner wall of the body and movably arranged up and down relative to the body. The sludge on the inner wall of the tank is loosened by the up-and-down movement of the tooth plate assembly. After the sludge loses the binding force with the inner wall of the tank, the above-mentioned bridging phenomenon is eliminated, and the sludge is smoothly fed downward. Since the tooth plate assembly reciprocates up and down, theoretically, as long as the tooth plate assembly is long enough, the bridge breaking operation in the entire height direction of the mud bin can be realized.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a mud silo bridge-breaking mechanism. Background Technology

[0002] Horizontal screw centrifuges can separate sludge from muddy wastewater for further treatment. The dry sludge separated by the centrifuge is typically collected in a sludge bin and then periodically transported to downstream treatment facilities. The sludge bin is generally cylindrical, with a discharge port and scraper mechanism at the bottom. The scraper mechanism sweeps the sludge from the bottom of the bin to the discharge port. However, the sludge in the bin often becomes compacted due to long-term accumulation. When the bottom sludge is discharged, the upper sludge cannot replenish it in time, resulting in a "bridging" phenomenon. Existing bridging devices (such as Chinese invention patent application CN110654729A) can generally only break up bridging in the sludge near the bottom. When sludge at higher levels becomes compacted and bridged, existing technologies cannot effectively address this, affecting sludge discharge efficiency. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a mud silo bridging mechanism that can loosen the sludge along the entire height of the mud silo to eliminate caking and bridging phenomena and improve the sludge discharge efficiency.

[0004] To achieve the above and other related objectives, the present invention provides a mud silo bridge breaking mechanism, comprising: A mud bin, comprising a cylindrical body and a bottom wall at the bottom of the body, wherein a discharge port is provided on the bottom wall; A scraper is rotatably disposed on the inner side of the bottom wall. The scraper is connected to a drive element disposed below the sludge bin. The drive element is configured to drive the scraper to rotate forward or backward. The scraper includes several scraper arms for sweeping sludge on the bottom wall into the discharge port during the rotation of the scraper. The toothed plate assembly fits against the inner wall of the body, and the toothed plate assembly is movably arranged vertically relative to the body.

[0005] In an optional embodiment of the present invention, a transmission mechanism is provided between the toothed plate assembly and the scraper, and the transmission mechanism is configured to drive the toothed plate assembly to reciprocate up and down when the scraper rotates.

[0006] In an optional embodiment of the present invention, the transmission mechanism includes a drive ring disposed at the edge of the scraper, the drive ring having a guide portion disposed circumferentially, and the guide portion having a plurality of axial arched portions spaced circumferentially; the transmission mechanism further includes a first guide roller disposed at the bottom of the toothed plate assembly, the first guide roller being restricted to move along the guide portion, and the toothed plate assembly undulating up and down when the first guide roller passes the axial arched portions.

[0007] In an optional embodiment of the present invention, a transmission mechanism is provided between the toothed plate assembly and the scraper. The transmission mechanism is configured such that when the scraper rotates forward, the transmission mechanism can keep the toothed plate assembly stationary, and when the scraper rotates in reverse, the transmission mechanism can drive the toothed plate assembly to reciprocate up and down.

[0008] In an optional embodiment of the present invention, the transmission mechanism includes a drive ring disposed at the edge of the scraper, the drive ring having a guide portion disposed circumferentially, and the guide portion having a plurality of axial arched portions spaced circumferentially; the transmission mechanism also includes a first guide roller, the first guide roller being disposed to move up and down synchronously with the toothed plate assembly, the first guide roller and the guide portion forming a limiting engagement, and when the scraper rotates in reverse, the first guide roller can pass through the axial arched portions to realize the up and down movement of the toothed plate assembly; it also includes an avoidance mechanism, the avoidance mechanism being assembled such that when the scraper rotates forward, the avoidance mechanism can drive the first guide roller to avoid the axial arched portions.

[0009] In an optional embodiment of the present invention, the avoidance mechanism includes a floating base, which is movably connected to the toothed plate assembly along the radial direction of the mud bin. A first guide roller is mounted on the floating base, and a second guide roller is provided on the floating base. The second guide roller forms a limiting engagement with the edge of the drive ring. The edge of the drive ring is provided with a radial arch, and the radial arch and the axial arch are arranged correspondingly in the circumferential direction of the drive ring. When the scraper rotates clockwise, the floating base can move away from the drive ring under the guidance of the radial arch and the second guide roller, so that the first guide roller avoids the axial arch.

[0010] In an optional embodiment of the present invention, an extension is provided at the bottom of one side of the axial arch, the extension being flush with the section of the guide portion other than the axial arch, and the extension extending to the bottom of the axial arch; a notch is provided on the side of the radial arch away from the extension, the notch being flush with the section of the drive ring other than the radial arch.

[0011] In an optional embodiment of the present invention, an elastic element is provided between the floating base and the toothed plate assembly, the elastic element being configured such that its elastic force can drive the floating base toward the drive ring.

[0012] In an optional embodiment of the present invention, the rear side of the scraper arm is provided with a ramp surface when the scraper rotates forward.

[0013] In an optional embodiment of the present invention, a screw conveyor is provided below the discharge port.

[0014] The technical effect of this invention is that the toothed plate assembly that moves up and down loosens the sludge on the inner wall of the tank. After the sludge loses its binding force with the inner wall of the tank, the above-mentioned bridging phenomenon will be resolved, ensuring that the sludge is fed downward smoothly. Since the toothed plate assembly of this invention moves up and down reciprocally, theoretically, as long as the toothed plate assembly is long enough, it can achieve the bridging operation in the entire height direction of the sludge bin. Attached Figure Description

[0015] Figure 1 This is a perspective view of the mud silo bridge-breaking mechanism provided in an embodiment of the present invention; Figure 2 This is a top view of the mud silo bridge breaking mechanism provided in an embodiment of the present invention; Figure 3 yes Figure 2 AA partial sectional view; Figure 4 yes Figure 3 A cross-sectional view of another state of the area shown; Figure 5 This is a perspective view of the scraper provided in an embodiment of the present invention; Figure 6 yes Figure 5 A magnified view of part of the I; Figure 7 This is an exploded view of the toothed plate assembly provided in an embodiment of the present invention. Detailed Implementation

[0016] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0017] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0018] Sludge storage tanks are crucial facilities in wastewater treatment plants for storing sludge. They primarily consist of the tank structure, inlets and outlets, and discharge devices. The tank structure is typically constructed of reinforced concrete or welded steel plates. The tank usually has an inlet and an outlet, allowing sludge to be pumped in and out by gravity. The discharge device is used for quantitative discharge. The characteristics of particulate matter in sludge, such as cellulose and clay, make it prone to caking during anaerobic fermentation, hindering smooth downward discharge—a phenomenon commonly known as bridging. Existing bridging devices generally only address sludge near the bottom layer. When sludge at higher levels experiences caking and bridging, current technologies are ineffective, impacting sludge discharge efficiency. To address this, the present invention provides a bridging mechanism. This mechanism uses a toothed plate assembly that moves up and down to loosen the sludge on the inner wall of the tank. Once the sludge loses its binding force with the inner wall of the tank, the bridging phenomenon will be resolved, ensuring that the sludge is fed downward smoothly. Since the toothed plate assembly of the present invention moves up and down reciprocally, theoretically, as long as the toothed plate assembly is long enough, it can achieve bridging operation along the entire height of the sludge bin.

[0019] Please see Figure 1-7 As shown, the technical solution of the present invention will be described in detail below with reference to specific embodiments: Please see Figure 1 , 2 As shown, the mud silo breaking mechanism provided in the embodiment of the present invention includes a mud silo 10, a scraper 20, and a toothed plate assembly 30; the mud silo 10 includes a cylindrical body and a bottom wall 11 located at the bottom of the body, and a discharge port 12 is provided on the bottom wall 11; the scraper 20 is rotatably disposed on the inner side of the bottom wall 11, and the scraper 20 is connected to a driving element (not shown) disposed below the mud silo 10, the driving element being configured to drive the scraper 20 to rotate forward or backward, the scraper 20 including a plurality of scraper arms 21 for sweeping the sludge on the bottom wall 11 into the discharge port 12 during the rotation of the scraper 20; the toothed plate assembly 30 is fitted against the inner wall of the body, and the toothed plate assembly 30 is movably disposed up and down relative to the body.

[0020] It should be understood that the present invention uses the toothed plate assembly 30 that moves up and down to loosen the sludge on the inner wall of the tank. After the sludge loses the binding force between itself and the inner wall of the tank, the above-mentioned bridging phenomenon will be relieved, ensuring that the sludge is fed downward smoothly. Since the toothed plate assembly 30 of the present invention moves up and down reciprocally, theoretically, as long as the toothed plate assembly 30 is long enough, it can achieve the bridging operation in the entire height direction of the sludge bin 10.

[0021] Example 1 In an optional embodiment of the present invention, a transmission mechanism is provided between the toothed plate assembly 30 and the scraper 20. The transmission mechanism is configured to drive the toothed plate assembly 30 to reciprocate up and down when the scraper 20 rotates. The transmission mechanism includes a drive ring 22 disposed on the edge of the scraper 20. The drive ring 22 is provided with a guide portion 221 disposed circumferentially. The guide portion 221 is provided with a plurality of axial arched portions 222 spaced apart circumferentially. The transmission mechanism also includes a first guide roller 32 disposed at the bottom of the toothed plate assembly 30. The first guide roller 32 is restricted to move along the guide portion 221. When the first guide roller 32 passes the axial arched portions 222, the toothed plate assembly 30 undulates up and down.

[0022] In this embodiment, as long as the scraper 20 is rotating, the toothed plate assembly 30 can be driven to move up and down through the transmission mechanism. The toothed plate assembly 30 does not need to be equipped with additional driving components, which reduces the equipment cost.

[0023] Example 2 It should be understood that bridging is an occasional event, so the bridging mechanism theoretically does not need to be in a working state all the time. Therefore, based on Example 1, this embodiment uses the forward and reverse rotation of the scraper 20 to switch the bridging mechanism between working and idle states, which can effectively reduce system energy consumption, as detailed below: Please see Figure 3-7 As shown, in an optional embodiment of the present invention, a transmission mechanism is provided between the toothed plate assembly 30 and the scraper 20. The transmission mechanism is configured such that when the scraper 20 rotates clockwise, the transmission mechanism can keep the toothed plate assembly 30 stationary, and when the scraper 20 rotates counterclockwise, the transmission mechanism can drive the toothed plate assembly 30 to reciprocate up and down. It should be noted that, in the description of the present invention, clockwise rotation refers to the direction of rotation of the scraper 20 during normal material discharge, i.e. Figure 2 The state shown is counterclockwise; conversely, the reversal is... Figure 2 The clockwise direction shown.

[0024] For details, please refer to Figure 6 , 7As shown, the transmission mechanism includes a drive ring 22 disposed on the edge of the scraper 20, the drive ring 22 having a guide portion 221 disposed circumferentially, and the guide portion 221 having a plurality of axial arched portions 222 spaced circumferentially; the transmission mechanism also includes a first guide roller 32, the first guide roller 32 being disposed to move up and down synchronously with the toothed plate assembly, the first guide roller 32 and the guide portion 221 forming a limiting engagement, when the scraper 20 reverses, the first guide roller 32 can pass through the axial arched portions 222 to realize the up and down movement of the toothed plate assembly 30; it also includes an avoidance mechanism, the avoidance mechanism being assembled such that when the scraper 20 rotates forward, the avoidance mechanism can drive the first guide roller 32 to avoid the axial arched portions 222.

[0025] Please see Figure 6 , 7 As shown, in an optional embodiment of the present invention, the avoidance mechanism includes a floating base 31, which is movably connected to the toothed plate assembly 30 along the radial direction of the mud bin 10. A first guide roller 32 is mounted on the floating base 31, and a second guide roller 33 is provided on the floating base 31. The second guide roller 33 forms a limiting engagement with the edge of the drive ring 22. The edge of the drive ring 22 is provided with a radial arch 223, and the radial arch 223 and the axial arch 222 are arranged correspondingly in the circumferential direction of the drive ring 22. When the scraper 20 rotates clockwise, the floating base 31 can move away from the drive ring 22 under the guidance of the radial arch 223 and the second guide roller 33, so that the first guide roller 32 avoids the axial arch 222.

[0026] Please see Figure 6 As shown, in an optional embodiment of the present invention, an extension 224 is provided at the bottom of one side of the axial arch 222. The extension 224 is flush with the section of the guide 221 other than the axial arch 222, and the extension 224 extends to the bottom of the axial arch 222. A notch 225 is provided on the side of the radial arch 223 away from the extension 224. The notch 225 is flush with the section of the drive ring 22 other than the radial arch 223.

[0027] Please see Figure 3 , 4 As shown, in an optional embodiment of the present invention, an elastic element 34 is provided between the floating base 31 and the toothed plate assembly 30, and the elastic element 34 is configured such that its elastic force can drive the floating base 31 toward the drive ring 22.

[0028] The following combination Figure 2 , 3Sections 4, 6, and 7 explain the working principle of this invention: by Figure 2 Taking the state shown as an example, when the scraper 20 rotates counterclockwise, after the axial arch 222 reaches the floating base 31, the first guide roller 32 on the floating base 31 enters the extension 224. As the scraper 20 continues to rotate, the second guide roller 33 contacts the radial arch 223, and the floating base 31 moves radially outward under the action of the radial arch 223. Figure 4 As shown, at this time, the first guide roller 32 is withdrawn from the extension 224, thereby avoiding interference between the first guide roller 32 and the end of the extension 224; after the radial arch 223 passes the floating base 31, the floating base 31 is reset under the action of the elastic element 34, thereby causing the first guide roller 32 to re-insert into the guide portion 221; during this process, the first guide roller 32 does not pass through the axial arch 222, so the toothed plate assembly 30 will not rise and fall. In addition to the energy consumption required for normal material pushing during the rotation of the scraper 20, only the energy consumption for driving the floating base 31 is required, and the floating base 31 has no other load except for overcoming the elastic force of the elastic element 34. When a bridge breaking operation is required, the same applies. Figure 2 Taking the illustrated state as an example, the drive scraper 20 rotates clockwise. When the axial arch 222 and radial arch 223 pass the floating base 31, the second guide roller 33 enters the notch 225. As the scraper 20 continues to rotate, the floating base 31 and the toothed plate assembly 30 are lifted by the action of the first guide roller 32 and the axial arch 222. At this time, the second guide roller 33 is pulled out from the notch 225 to avoid interference between the second guide roller 33 and the radial arch 223. After the axial arch 222 passes the floating base 31, the floating base 31 and the toothed plate assembly 30 complete one up-and-down reciprocating motion, thus loosening the sludge on the bin wall. In practical applications, multiple toothed plate assemblies 30 can be arranged at intervals along the circumference of the bin wall.

[0029] Please see Figure 5 As shown, in an optional embodiment of the present invention, the rear side of the scraper arm 21 when the scraper 20 rotates forward is provided with a ramp surface 211 to reduce the resistance of the sludge to the scraper 20 when the scraper 20 rotates in reverse.

[0030] Please see Figure 1 , 2 As shown, in an optional embodiment of the present invention, a screw conveyor 40 is provided below the discharge port 12 to achieve quantitative discharge of materials.

[0031] In summary, this invention uses a toothed plate assembly 30 that moves up and down to loosen the sludge on the inner wall of the tank. Once the sludge loses its binding force with the inner wall of the tank, the bridging phenomenon is resolved, ensuring that the sludge is fed downwards smoothly. Since the toothed plate assembly 30 of this invention moves up and down reciprocally, theoretically, as long as the toothed plate assembly 30 is long enough, it can achieve bridging operation along the entire height of the sludge bin 10. The scraper 20 drives the toothed plate assembly 30 to move up and down through a transmission mechanism, eliminating the need for additional drive components and reducing equipment costs. This invention utilizes the forward and reverse rotation of the scraper 20 to switch the bridging mechanism between working and idle states, which effectively reduces system energy consumption.

[0032] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

[0033] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the invention. However, those skilled in the art will recognize that embodiments of the invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Claims

1. A mud silo bridge-breaking mechanism, characterized in that, include: A mud bin, comprising a cylindrical body and a bottom wall at the bottom of the body, wherein a discharge port is provided on the bottom wall; A scraper is rotatably disposed on the inner side of the bottom wall. The scraper is connected to a drive element disposed below the sludge bin. The drive element is configured to drive the scraper to rotate forward or backward. The scraper includes several scraper arms for sweeping sludge on the bottom wall into the discharge port during the rotation of the scraper. The toothed plate assembly fits against the inner wall of the body, and the toothed plate assembly is movably arranged vertically relative to the body; A transmission mechanism is provided between the toothed plate assembly and the scraper. The transmission mechanism is configured such that when the scraper rotates forward, the transmission mechanism can keep the toothed plate assembly stationary, and when the scraper rotates in reverse, the transmission mechanism can drive the toothed plate assembly to reciprocate up and down. The transmission mechanism includes a drive ring disposed on the edge of the scraper, the drive ring having a guide portion disposed circumferentially, and the guide portion having a plurality of axial arched portions spaced circumferentially; the transmission mechanism also includes a first guide roller, the first guide roller being disposed to move up and down synchronously with the toothed plate assembly, the first guide roller forming a limiting engagement with the guide portion, and when the scraper rotates in reverse, the first guide roller being able to pass through the axial arched portions to realize the up and down movement of the toothed plate assembly; it also includes a clearance mechanism, the clearance mechanism being assembled such that when the scraper rotates forward, the clearance mechanism can drive the first guide roller to avoid the axial arched portions; The avoidance mechanism includes a floating base, which is movably connected to the toothed plate assembly along the radial direction of the mud bin. A first guide roller is mounted on the floating base, and a second guide roller is provided on the floating base. The second guide roller and the edge of the drive ring form a limiting engagement. The edge of the drive ring is provided with a radial arch, and the radial arch and the axial arch are arranged correspondingly in the circumferential direction of the drive ring. When the scraper rotates clockwise, the floating base can move away from the drive ring under the guidance of the radial arch and the second guide roller, so that the first guide roller avoids the axial arch.

2. The mud silo bridge-breaking mechanism according to claim 1, characterized in that, The bottom of one side of the axial arched portion is provided with an extension portion, which is flush with the section of the guide portion other than the axial arched portion, and the extension portion extends to the bottom of the axial arched portion; the radial arched portion is provided with a notch portion on the side away from the extension portion, which is flush with the section of the drive ring other than the radial arched portion.

3. The mud silo bridge-breaking mechanism according to claim 1, characterized in that, An elastic element is provided between the floating base and the toothed plate assembly. The elastic element is configured such that its elastic force can drive the floating base closer to the drive ring.

4. The mud silo bridge-breaking mechanism according to claim 1, characterized in that, The scraper arm has a sloping surface on its rear side when the scraper rotates forward.

5. The mud silo bridge-breaking mechanism according to claim 1, characterized in that, A screw conveyor is provided below the discharge port.

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