Detachable dry blade and horizontal single-shaft disc dryer

Abstract

The application discloses detachable drying blades, relates to the technical field of sludge drying, and discloses a blade body which is arranged in a drying cavity and is close to a discharge port of a shell. The blade body comprises a first circular blade and a ring-shaped wear-resistant disc. The inner edge of the ring-shaped wear-resistant disc is fixedly connected with the circumferential outer edge of the first circular blade. The circumferential outer edge of the ring-shaped wear-resistant disc is radially beyond the circumferential outer edge of the first circular blade, and the outer edge of the ring-shaped wear-resistant disc is arranged to have a gap with the inner wall of the shell. The first circular blade is arranged to be fixedly sleeved on the outer surface of a hollow shaft and can rotate with the hollow shaft. The first circular blade is hollow and is arranged to be in communication with the hollow shaft. The application further provides a horizontal single-shaft disc dryer comprising the detachable drying blades. The detachable drying blades and the horizontal single-shaft disc dryer can avoid steam leakage of the blades near the discharge port.

Description

Technical Field

[0001] This invention relates to the field of sludge drying technology, and in particular to a detachable drying blade and a horizontal single-shaft disc dryer. Background Technology

[0002] Currently, the domestic municipal sludge treatment field widely adopts steam thermal drying technology with horizontal single-shaft disc dryers as the core. Its advantages are large single-unit processing capacity, convenient operation, low investment cost, and low operating cost. However, it also has some drawbacks. During long-term operation of the horizontal single-shaft disc dryer, because the sludge flows between the edge of the previous disc blade and the inner wall of the shell to the next disc blade, and steam is introduced into the disc blade to bring the surface of the disc blade to a certain temperature and dry the sludge, the sludge near the discharge end has already reached a certain degree of dryness. Therefore, the edge of the disc blade near the discharge end comes into contact with the relatively dry sludge and suffers severe wear, which can easily lead to steam leakage. This requires emergency shutdown, and the equipment maintenance time is long, which seriously affects the normal operation of the municipal sludge drying device. Summary of the Invention

[0003] The purpose of this invention is to provide a detachable drying blade and a horizontal single-shaft disc dryer to solve the problems existing in the prior art and avoid steam leakage from the blades near the discharge port.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a detachable drying blade, comprising a blade body for placement within a drying chamber near the discharge port of a housing; the blade body includes a first annular blade and an annular wear-resistant disc, the inner edge of the annular wear-resistant disc being fixedly connected to the circumferential outer edge of the first annular blade, the circumferential outer edge of the annular wear-resistant disc extending radially beyond the circumferential outer edge of the first annular blade, and the outer edge of the annular wear-resistant disc having a gap with the inner wall of the housing; the first annular blade is fixedly sleeved on the outside of a hollow shaft and can rotate with the hollow shaft, and the first annular blade is hollow and communicates with the inside of the hollow shaft.

[0006] Preferably, the annular wear-resistant disc and the first annular blade are detachably connected.

[0007] Preferably, the annular wear-resistant disc is bolted to the first annular blade.

[0008] Preferably, the annular wear-resistant disc is configured as a circular disc, the circular disc is aligned with the axis of the first circular disc blade, the outer diameter of the first circular disc blade is larger than the inner diameter of the circular disc and smaller than the outer diameter of the circular disc blade; the outer diameter of the circular disc blade is used to be the same as the outer diameter of the second circular disc blade.

[0009] Preferably, the annular wear-resistant disc includes at least two sub-discs, and the plurality of sub-discs can be detachably connected along the circumference of the first annular blade to form the annular wear-resistant disc.

[0010] The present invention also provides a horizontal single-shaft disc dryer, comprising a shell, a hollow shaft, a plurality of detachable drying blades as described above, and a plurality of second annular blades; the shell has a drying chamber, and both ends of the shell have an inlet and an outlet communicating with the drying chamber, respectively; the hollow shaft passes through the shell and is rotatable relative to the shell about its own axis; the plurality of detachable drying blades and the plurality of second annular blades are spaced apart along the axial direction of the hollow shaft within the drying chamber and are all fixedly sleeved outside the hollow shaft, and the plurality of detachable drying blades and the plurality of second annular blades are further arranged in a manner that is not explicitly stated in the original text. Two annular blades are respectively located near the discharge port and the feed port, and the first annular blade and the second annular blade of the plurality of detachable drying blades are all hollow and communicate with the hollow shaft; there is a gap between the outer edge of each second annular blade and the outer edge of the annular wear-resistant disc of each detachable drying blade and the inner wall of the housing; steam is introduced into the hollow shaft, and the hollow shaft is connected to the power mechanism and can rotate around its own axis under the drive of the power mechanism, thereby driving each detachable drying blade and each second annular blade to rotate synchronously.

[0011] Preferably, at least one material-lifting component is fixedly provided on the outer edge of each of the second annular blades and the outer edge of each of the annular wear-resistant discs. Each material-lifting component rotates with the second annular blade or the annular wear-resistant disc it is located on and is used to drive the sludge through the gap.

[0012] Preferably, each of the material-lifting components is configured as a rectangular material-lifting plate, and each of the rectangular material-lifting plates is inclinedly disposed on the second annular blade or the annular wear-resistant disc.

[0013] Preferably, the outer diameters of the first annular blades are the same, the outer diameters of the second annular blades are the same, and the annular wear-resistant discs are all configured as annular discs, with the outer diameter of each annular disc being the same as the outer diameter of each second annular blade.

[0014] Preferably, a cutting element is provided between adjacent second annular blades, one end of which is fixedly connected to the inner wall of the housing, and the cutting element is used to cut the sludge between adjacent second annular blades.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] The detachable drying blade provided by this invention allows the blade body to rotate under the action of the hollow shaft to stir and dry the sludge during use. Because an annular wear-resistant disc is fixedly installed circumferentially on the outer edge of the first annular blade, and the inner edge of the annular wear-resistant disc is fixedly connected to the outer edge of the first annular blade, there is no gap between the annular wear-resistant disc and the first annular blade in the radial direction. Sludge with a high degree of drying will not pass between the annular wear-resistant disc and the first annular blade. Therefore, the wear between the outer edge of the first annular blade and the sludge with a high degree of drying is minimal, and internal steam will not leak. Furthermore, because a gap is formed between the outer edge of the annular wear-resistant disc and the inner wall of the shell, the sludge with a high degree of drying passes through the gap and contacts and wears against the outer edge of the annular wear-resistant disc, rather than the outer edge of the first annular blade. No steam is introduced into the annular wear-resistant disc, so neither the annular wear-resistant disc nor the first annular blade will leak steam.

[0017] The horizontal single-shaft disc dryer provided by this invention introduces steam into the hollow shaft and into multiple detachable drying blades and multiple second annular blades to dry the sludge. Moreover, the power mechanism can drive the hollow shaft to rotate and drive the multiple detachable drying blades and multiple second annular blades to stir the sludge. The annular wear-resistant disc of the detachable drying blades can prevent steam leakage caused by the wear between the edge of the first annular blade and the sludge with a high degree of drying. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view schematic diagram of the detachable drying blade provided in Embodiment 1;

[0020] Figure 2 This is a schematic diagram of the internal structure of the horizontal single-shaft disc dryer provided in Example 2;

[0021] Figure 3 for Figure 2 The provided schematic diagram of a horizontal single-shaft disc dryer is shown on the right.

[0022] Icons: 1-Horizontal single-shaft disc dryer; 10-Shell; 11-Drying chamber; 12-Inlet; 13-Outlet; 20-Hollow shaft; 30-Removable drying blades; 31-First annular blade; 32-Annular wear-resistant disc; 33-Gap; 40-Second annular blade; 50-Feeding component; 60-Cutting component. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a detachable drying blade and a horizontal single-shaft disc dryer to solve the problems existing in the prior art and avoid steam leakage from the blades near the discharge port.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] This embodiment provides a detachable drying blade 30. Please refer to [link / reference]. Figure 1 and Figure 2 The device includes a blade body, which is placed inside the drying chamber 11 and close to the discharge port 13 of the housing 10. The blade body includes a first annular blade 31 and an annular wear-resistant disc 32. The inner edge of the annular wear-resistant disc 32 is fixedly connected to the outer circumferential edge of the first annular blade 31. The outer circumferential edge of the annular wear-resistant disc 32 extends radially beyond the outer circumferential edge of the first annular blade 31, and the outer edge of the annular wear-resistant disc 32 is used to have a gap 33 between itself and the inner wall of the housing 10. The first annular blade 31 is fixedly sleeved outside the hollow shaft 20 and can rotate with the hollow shaft 20. The first annular blade 31 is hollow and is used to communicate with the inside of the hollow shaft 20.

[0028] During use, the blade body can rotate under the action of the hollow shaft 20 to stir and dry the sludge. Since the annular wear-resistant disc 32 is fixedly provided on the outer circumference of the first annular blade 31, and the inner edge of the annular wear-resistant disc 32 is fixedly connected to the outer edge of the first annular blade 31, that is, there is no gap between the annular wear-resistant disc 32 and the first annular blade 31 in the radial direction, the sludge with a high degree of drying will not pass through the annular wear-resistant disc 32 and the first annular blade 31. Therefore, the wear between the outer edge of the first annular blade and the sludge with a high degree of drying is small, and the internal steam will not leak. In addition, since a gap 33 is formed between the outer edge of the annular wear-resistant disc 32 and the inner wall of the shell 10, the sludge with a high degree of drying passes through the gap 33 and comes into contact with the outer edge of the annular wear-resistant disc 32 for wear, rather than coming into contact with the outer edge of the first annular blade 31 for wear. No steam is introduced into the annular wear-resistant disc 32, so neither the annular wear-resistant disc 32 nor the first annular blade 31 will leak steam.

[0029] In the optional embodiments of this invention, it is more preferred that the annular wear-resistant disc 32 and the first annular blade 31 can be detachably connected, which facilitates installation and disassembly.

[0030] Specifically, the annular wear-resistant disc 32 and the first annular blade 31 are connected circumferentially by multiple bolts; specifically, in order to avoid steam leakage at the connection, the annular wear-resistant disc 32 and the first annular blade 31 are connected at the part where steam leakage will not occur, or a connecting plate can be fixed around the outer edge of the first annular blade 31 first, and the connecting plate is then bolted to the annular wear-resistant disc 32.

[0031] In the optional embodiments of this example, more preferably, the annular wear-resistant disc 32 is configured as a circular disc, which is easy to manufacture and fits the shape of the shell 10 and the first circular blade 31, resulting in good stirring effect; the axis of the circular disc coincides with the axis of the first circular blade 31, and specifically with the axis of the hollow shaft 20, ensuring rotational stability; the outer diameter of the first circular blade 31 is larger than the inner diameter of the circular disc but smaller than the outer diameter of the circular disc, ensuring that the inner edge of the circular disc can completely cover the outer edge of the first circular blade 31, and ensuring that the outer edge of the circular disc extends radially beyond the outer edge of the first circular blade 31; the outer diameter of the circular disc is used to be the same as the outer diameter of the second circular blade 40, so that the gap 33 size is consistent, allowing the sludge to pass through stably.

[0032] In the optional embodiments of this example, more preferably, the annular wear-resistant disc 32 includes at least two sub-discs, and the multiple sub-discs can be detachably connected along the circumference of the first annular blade 31 to form the annular wear-resistant disc 32. The multiple sub-discs facilitate installation and disassembly.

[0033] Example 2

[0034] This embodiment provides a horizontal single-shaft disc dryer 1. Please refer to [link / reference]. Figure 2 and Figure 3The assembly includes a housing 10, a hollow shaft 20, multiple detachable drying blades 30 as provided in Embodiment 1, and multiple second annular blades 40. The housing 10 has a drying chamber 11, and both ends of the housing 10 have an inlet 12 and an outlet 13 communicating with the drying chamber 11, respectively. The hollow shaft 20 passes through the housing 10 and is rotatable relative to the housing 10 around its own axis. The multiple detachable drying blades 30 and multiple second annular blades 40 are axially spaced within the drying chamber 11 along the hollow shaft 20 and are all fixedly sleeved outside the hollow shaft 20. The multiple detachable drying blades 30 and multiple second annular blades 40 are respectively close to the outlet 13 and the outlet 13. The feed inlet 12, and the first annular blades 31 and the second annular blades 40 of the multiple detachable drying blades 30 are all hollow and communicate with the hollow shaft 20; there is a gap 33 between the outer edge of each second annular blade 40 and the outer edge of the annular wear-resistant disc 32 of each detachable drying blade 30 and the inner wall of the housing 10; the hollow shaft 20 is used to introduce steam, which can enter the first annular blades 31 and the second annular blades 40, and the hollow shaft 20 is connected to the power mechanism, and can rotate around its own axis under the drive of the power mechanism and drive each detachable drying blade 30 and each second annular blade 40 to rotate synchronously.

[0035] Specifically, the number of detachable drying blades 30 and second annular blades 40 can be determined according to actual needs.

[0036] In the optional scheme of this embodiment, more preferably, at least one material-lifting component 50 is fixedly provided on the outer edge of each second annular blade 40 and the outer edge of each annular wear-resistant disc 32. Each material-lifting component 50 rotates with the second annular blade 40 or the annular wear-resistant disc 32 it is located on, and is used to drive the sludge through the gap 33. Specifically, each material-lifting component 50 is set as a rectangular material-lifting plate. Each rectangular material-lifting plate is inclinedly arranged on the second annular blade 40 or the annular wear-resistant disc 32 it is located on, that is, the pushing surface of the rectangular material-lifting plate is biased towards the conveying direction of the sludge. In this way, the rectangular material-lifting plate can push the sludge through the gap 33 during rotation.

[0037] Furthermore, each second annular blade 40 or each annular wear-resistant disc 32 is configured with at least two material-lifting components 50, which are evenly distributed along the circumference to improve the sludge throughput efficiency.

[0038] In the optional scheme of this embodiment, it is more preferred that the outer diameters of the first annular blades 31 and the second annular blades 40 are the same, and the annular wear-resistant discs 32 are all configured as annular discs with the same outer diameter as the second annular blades 40. This facilitates mass production and ensures that the gaps 33 are the same size, which facilitates the stable passage of sludge. In addition, it should be noted that since the outer diameter of the annular discs is the same as the outer diameter of the second annular blades 40, the outer diameter of the first annular blades 31 is lower than that of the second annular blades 40, resulting in a reduction in the heating area of ​​the first annular blades 31. However, since the sludge is already relatively well dried when it enters between the detachable drying blades 30 under the drying action of the multiple second annular blades 40, even if the heating area of ​​the first annular blades 31 is reduced, it will not affect the final drying of the sludge.

[0039] In the optional scheme of this embodiment, more preferably, a cutting element 60 is provided between adjacent second annular blades 40. One end of the cutting element 60 is fixedly connected to the inner wall of the housing 10. The cutting element 60 is used to cut the sludge between adjacent second annular blades 40, cut and crush large pieces of sludge, facilitate sludge drying, and avoid clogging.

[0040] Specifically, the cutting element 60 is configured as a wear-resistant cutting blade.

[0041] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A detachable drying blade, characterized in that: The device includes a blade body, which is placed inside the drying chamber (11) and near the discharge port (13) of the housing (10); the blade body includes a first annular blade (31) and an annular wear-resistant disc (32), the inner edge of the annular wear-resistant disc (32) is fixedly connected to the outer circumferential edge of the first annular blade (31), the outer circumferential edge of the annular wear-resistant disc (32) extends radially beyond the outer circumferential edge of the first annular blade (31), and the outer edge of the annular wear-resistant disc (32) is used to have a gap (33) with the inner wall of the housing (10); the first annular blade (31) is fixedly sleeved outside the hollow shaft (20) and can rotate with the hollow shaft (20), and the first annular blade (31) is hollow and used to communicate with the inside of the hollow shaft (20); The annular wear-resistant disc (32) is configured as a circular disc, the axis of which coincides with the axis of the first circular disc (31), and the outer diameter of the first circular disc (31) is greater than the inner diameter of the circular disc and less than the outer diameter of the circular disc; the outer diameter of the circular disc is used to be the same as the outer diameter of the second circular disc (40). The annular wear-resistant disc (32) includes at least two sub-discs, and the plurality of the sub-discs can be detachably connected along the circumference of the first annular blade (31) to form the annular wear-resistant disc (32).

2. The detachable drying blade according to claim 1, characterized in that: The annular wear-resistant disc (32) and the first annular blade (31) can be detachably connected.

3. The detachable drying blade according to claim 2, characterized in that: The annular wear-resistant disc (32) is bolted to the first annular blade (31).

4. A horizontal single-shaft disc dryer, characterized in that: The device includes a housing (10), a hollow shaft (20), a plurality of detachable drying blades (30) as described in any one of claims 1-3, and a plurality of second annular blades (40); the housing (10) has a drying chamber (11), and the housing (10) has an inlet (12) and an outlet (13) at both ends communicating with the drying chamber (11); the hollow shaft (20) passes through the housing (10) and is rotatable relative to the housing (10) about its own axis, and the plurality of detachable drying blades (30) and the plurality of second annular blades (40) are axially spaced along the hollow shaft (20) on the drying chamber. The drying chamber (11) is fixedly sleeved on the outside of the hollow shaft (20), and the multiple detachable drying blades (30) and the multiple second annular blades (40) are respectively close to the discharge port (13) and the feed port (12). The first annular blades (31) and the multiple second annular blades (40) of the multiple detachable drying blades (30) are all hollow and communicate with the hollow shaft (20). There is a gap (33) between the outer edge of each second annular blade (40) and the outer edge of the annular wear-resistant disc (32) of each detachable drying blade (30) and the inner wall of the housing (10). The hollow shaft (20) is used to introduce steam, and the hollow shaft (20) is connected to the power mechanism and can rotate around its own axis under the drive of the power mechanism, thereby driving each of the detachable drying blades (30) and each of the second annular blades (40) to rotate synchronously.

5. The horizontal single-shaft disc dryer according to claim 4, characterized in that: At least one material-lifting component (50) is fixedly provided on the outer edge of each of the second annular blades (40) and the outer edge of each of the annular wear-resistant discs (32). Each material-lifting component (50) rotates with the second annular blade (40) or the annular wear-resistant disc (32) it is located on, and is used to drive the sludge through the gap (33).

6. The horizontal single-shaft disc dryer according to claim 5, characterized in that: Each of the material-lifting components (50) is configured as a rectangular material-lifting plate, and each of the rectangular material-lifting plates is inclinedly disposed on the second annular blade (40) or the annular wear-resistant disc (32).

7. The horizontal single-shaft disc dryer according to claim 4, characterized in that: The outer diameters of the first annular blades (31) are the same, the outer diameters of the second annular blades (40) are the same, and the annular wear-resistant discs (32) are all configured as annular discs, with the outer diameter of each annular disc being the same as the outer diameter of each second annular blade (40).

8. The horizontal single-shaft disc dryer according to claim 4, characterized in that: A cutting element (60) is provided between adjacent second annular blades (40). One end of the cutting element (60) is fixedly connected to the inner wall of the housing (10). The cutting element (60) is used to cut the sludge between adjacent second annular blades (40).

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