Biomass screw feeder

Abstract

The utility model relates to the technical field of feeders, in particular to a biomass screw feeder, which comprises a trough with one closed end and one open end, and at least one feed inlet is arranged on the trough. The spiral blade is arranged in the trough, one end of the spiral blade is rotatably arranged at the closed end of the trough, and the other end of the spiral blade extends to the open end of the trough; the spiral blade comprises a first blade and a second blade, the first blade is arranged below the feeding port, and the screw pitch of the first blade is larger than that of the second blade; the feeding device further comprises a driving part, the driving part is arranged on the outer side of the closed end of the trough, and the output end of the driving part is connected with the spiral blade so as to drive the spiral blade to rotate in the trough. The utility model aims to solve the problem that a screw feeder is easy to block when conveying biomass fuel, the blocking risk can be effectively reduced, and the conveying efficiency of the material is improved.

Description

Technical Field

[0001] The present application relates to the technical field of boiler feeding devices, and in particular to a biomass screw feeder. Background Art

[0002] A biomass boiler is a device that uses biomass as fuel for heat conversion. Biomass fuels usually include renewable resources such as wood, crop residues, animal and plant oils and fats. Properties such as moisture and particle size may vary greatly. Therefore, the operation and maintenance of biomass boilers are more complex and difficult than traditional fossil fuel boilers.

[0003] At present, most biomass boilers use mechanical equipment such as chain feeders and screw feeders to transport biomass fuel from storage bins or storage piles to the boiler combustion chamber. Compared with chain feeders, which are more suitable for conveying block-shaped and large-block materials such as wood blocks and straw bales, the relatively more widely used screw feeders are suitable for conveying granular, powdered or small-block materials such as wood chips, sawdust, and granular straw. They have the characteristics of simple structure, long conveying distance, and large conveying capacity. When the boiler needs fuel, the drive device of the screw feeder starts, and the spiral blades rotate around the spiral shaft to form a continuous spiral propulsion force, and finally transport the biomass fuel from the discharge port to the combustion chamber of the boiler.

[0004] In the prior art, during the use of the screw feeder, due to the characteristics of biomass fuel, such as high humidity, high viscosity, irregular shape and size, it is easier for it to accumulate between the spiral blade and the feeder wall and cause blockage, especially on the side of the feed port. This phenomenon makes the burden on the screw shaft increase continuously, causing premature wear or even damage to the bearing, and finally causing the spiral blade to break or even break the shaft.

[0005] Therefore, the prior art has defects and needs to be improved and developed. Utility Model Content

[0006] The utility model aims to provide a biomass screw feeder, which is used to solve the problem that the screw feeder used for conveying biomass fuel is easy to be blocked.

[0007] The utility model provides a biomass spiral feeder, comprising:

[0008] A trough, one end of which is closed, the trough has at least one feed port, and the other end of which is open and serves as a discharge port;

[0009] A spiral blade, wherein the spiral blade is disposed in the material trough, one end of the spiral blade is rotatably disposed on the closed end of the material trough, and the other end extends to the open end of the material trough; the spiral blade comprises a first blade and a second blade, the first blade is disposed below the feed inlet, and the pitch of the first blade is greater than the pitch of the second blade;

[0010] It also includes a driving member, which is arranged outside the closed end of the material trough, and the output end of the driving member is connected to the spiral blade to drive the spiral blade to rotate in the material trough.

[0011] As a preferred technical solution of the present application, the pitch of the first blade is 1.5 to 2 times that of the second blade.

[0012] As a preferred technical solution of the present application, there are two discharge ports, which are respectively arranged above the closed end of the material trough and above the middle part of the material trough.

[0013] As a preferred technical solution of the present application, a gap is reserved between the spiral blade and the inner wall of the material trough, and the size of the gap is 5% to 10% of the diameter of the spiral blade.

[0014] As a preferred technical solution of the present application, the cross-section of the material trough is U-shaped.

[0015] As a preferred technical solution of the present application, a pressure sensor is provided in the material trough.

[0016] As a preferred technical solution of the present application, a wear-resistant layer is provided on the spiral blade.

[0017] As a preferred technical solution of the present application, it also includes a rotating shaft, which is concentrically arranged with the spiral blade, and the spiral blade is wound around the rotating shaft, and one end of the rotating shaft passes through the material trough to connect to the output end of the driving member.

[0018] As a preferred technical solution of the present application, it also includes at least two bearing seats, which are arranged between the driving member and the rotating shaft, and the bearing seats are used to support the rotating shaft.

[0019] As a preferred technical solution of the present application, a seal is provided at the connection between the rotating shaft and the material trough.

[0020] Beneficial effects:

[0021] It can be seen from the above technical solutions that the technical solution of the utility model provides a biomass screw feeder, which effectively reduces the blockage of materials during transportation by adopting the setting of spiral blades with different pitches and adjusting the length of the spiral blades in the trough. In addition, the reasonable setting of the blade pitch and gap also reduces the friction between the material and the components, reduces the wear of the components, and effectively improves the durability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the biomass screw feeder provided in an embodiment of the present application.

[0024] Figure 2 A side view of a material trough provided in an embodiment of the present application.

[0025] Figure 3 This is a schematic structural diagram of a biomass screw feeder provided in another embodiment of the present application.

[0026] In the figure, the meanings of the reference numerals are as follows:

[0027] A material trough 1, a material feed port 1-1, a material discharge port 1-2, a pressure sensor 1-2, a spiral blade 2, a first blade 2-1, a second blade 2-2, a driving member 3, a rotating shaft 4, a bearing seat 5, and a sealing member 6. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0033] An embodiment of the utility model provides a biomass screw feeder, which can more effectively and evenly transport biomass fuels of different humidity and viscosity to a boiler combustion chamber, effectively reduce or avoid accumulation and blockage of materials, and improve the overall transportation efficiency.

[0034] Reference Figure 1 , is a schematic diagram of the structure of a biomass screw feeder provided in an embodiment of the present application. As can be seen from the figure, the biomass screw feeder includes a feed trough 1, a spiral blade 2 and a driving member 3.

[0035] One end of the trough 1 is closed, and the trough 1 has at least one feed port 1-1, so that one or more feed ports 1-1 can be selectively enabled according to actual production needs, and the other end of the trough 1 is open as a discharge port 1-2 for conveying materials to the combustion chamber of the boiler. Figure 1 In this embodiment, there are two feed inlets 1 - 1 , which are respectively arranged above the closed end of the material trough 1 and above the middle part of the material trough 1 .

[0036] The spiral blade 2 is disposed in the trough 1, one end of the spiral blade 2 is rotatably disposed on the closed end of the trough 1, and the other end extends to the open end of the trough 1. Figure 1 As can be seen from the figure, the length of the spiral blade 2 is consistent with the length of the material trough 1, that is, the spiral blade 2 completely covers the entire material trough 1, reducing the retention of materials in the dead corners of the material trough 1, ensuring that the biomass fuel is always subjected to a relatively uniform driving force generated by the rotation of the spiral blade 2 during the process from feeding to discharging, effectively improving the material transportation efficiency.

[0037] In this embodiment, the driving member 3 may be a reduction motor, which is convenient for controlling the conveying speed of the material more accurately and stably. Figure 1The reduction motor is arranged on the side of the closed end of the spiral blade 2 close to the material trough 1, and its output end is connected to the spiral blade 2 to drive the spiral blade 2 to rotate in the material trough 1, so as to continuously transport the fuel in the material trough 1 to the combustion chamber for combustion through rotation.

[0038] Biomass fuel has the characteristics of high humidity, high viscosity, and irregular shape and size. When it is transported in excess or unevenly, it is easy to accumulate at the feed port 1-1, eventually leading to the occurrence of material blockage. To address this problem, in this embodiment, the pitch of the spiral blade 2 close to the closed end of the trough 1 is greater than the pitch close to the open end of the trough 1, that is, the feed side of the trough 1 has a larger accommodating space than the discharge side, which helps to more effectively transfer the biomass material from the feed side to the discharge side, reduce the material pressure at the feed end of the trough 1, and reduce the risk of material blockage. Preferably, the pitch of the first blade 2-1 is 1.5 to 2 times that of the second blade 2-2, ensuring that a better anti-blocking effect can be achieved at a higher conveying efficiency.

[0039] In this embodiment, a gap is reserved between the spiral blade 2 and the inner wall of the trough 1 to reserve a certain amount of space for the material to move, so as to prevent the material from being over-compressed between the spiral blade 2 and the trough 1 when conveying materials with high compressibility, which is not conducive to full combustion. Preferably, the size of the gap is 5% to 10% of the diameter of the spiral blade 2. By controlling the size of the gap, the conveying capacity and anti-blocking requirements are further balanced.

[0040] In this embodiment, the cross-section of the material trough 1 is U-shaped, which is not only more convenient for conveying biomass fuel with higher viscosity, reducing the accumulation and accumulation of materials and improving the conveying efficiency, but also convenient for cleaning and maintenance. When a small probability of blockage occurs, the material can be quickly cleaned up to reduce blockage and downtime.

[0041] In some embodiments, a wear-resistant layer is also provided on the spiral blade 2. The wear-resistant layer can be made of a material with good wear resistance, such as cemented carbide, ceramic coating, high molecular polymer, etc., to reduce the friction between the spiral blade 2 and the material, thereby extending its service life.

[0042] An embodiment of the present application is introduced above, and another embodiment of the present application is described as follows.

[0043] Reference Figure 2, the spiral feeder is partially different. In addition to the same components such as the spiral blade 2 and the driving member 3 mentioned above, in this embodiment, the biomass screw feeder includes a rotating shaft 4, which is concentrically arranged with the spiral blade 2, and the spiral blade 2 is wound on the rotating shaft 4, and one end of the rotating shaft 4 passes through the material trough 1 to connect to the output end of the driving member 3.

[0044] The spiral blade 2 is directly wound around the rotating shaft 4, and the driving member 3 is directly connected to the rotating shaft 4 to drive the spiral blade 2. The configuration of the rotating shaft 4 effectively improves the overall structural stability of the biomass screw feeder, so that a larger batch of materials can be transported. In addition, in addition to transporting materials with high viscosity, it is also suitable for some wet or dry materials, and has a wider range of applications. Figure 2 At least two bearing seats 5 are provided between the driving member 3 and the rotating shaft 4. The bearing seats 5 are used to support the rotating shaft 4 to ensure that it can still operate stably under large torque and load conditions. A sealing member 6 is also provided at the connection between the rotating shaft 4 and the trough 1. Its sealing performance can prevent leakage of materials, especially prevent biomass materials with relatively high viscosity and fluidity from entering the structural matching gap, so as to ensure the smooth operation of the system.

[0045] In this embodiment, the addition of the rotating shaft 4 reduces the material storage space in the trough 1 accordingly, and the probability of material entanglement and blockage is increased compared to the shaftless biomass screw feeder. Therefore, a pressure sensor 1-3 is also provided in the trough 1 to monitor the position and operating status of the material. There can be multiple pressure sensors 1-3 and they are arranged at the bottom of the trough 1. When the material flow is too large or too small, it can be fed back to the corresponding control system in time to facilitate the adjustment of the parameters such as the rotation speed of the driving member 3 to maintain a suitable material supply; when blockage and other situations occur, the pressure sensor 1-3 can be fed back to the control system in time to remind the operator to clean and troubleshoot in time to ensure that the feeding process continues smoothly.

[0046] In summary, the biomass screw feeder provided by the technical solution in the above embodiment effectively reduces the risk of blockage, improves the material conveying efficiency, increases the stability of the system, and ensures production safety by improving the rotating feeding components.

[0047] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0048] The above is a detailed introduction to a biomass screw feeder provided in an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A biomass screw feeder, characterized in that: include: A trough, one end of which is closed, the trough has at least one feed port, and the other end of which is open and serves as a discharge port; A spiral blade, wherein the spiral blade is disposed in the material trough, one end of the spiral blade is rotatably disposed on the closed end of the material trough, and the other end extends to the open end of the material trough; the spiral blade comprises a first blade and a second blade, the first blade is disposed below the feed inlet, and the pitch of the first blade is greater than the pitch of the second blade; It also includes a driving member, which is arranged outside the closed end of the material trough, and the output end of the driving member is connected to the spiral blade to drive the spiral blade to rotate in the material trough.

2. The biomass screw feeder according to claim 1, characterized in that: The pitch of the first blade is 1.5 to 2 times that of the second blade.

3. The biomass screw feeder according to claim 1, characterized in that: There are two discharge ports, which are respectively arranged above the closed end of the material trough and above the middle part of the material trough.

4. The biomass screw feeder according to claim 1, characterized in that: A gap is reserved between the spiral blade and the inner wall of the material trough, and the size of the gap is 5% to 10% of the diameter of the spiral blade.

5. The biomass screw feeder according to claim 1, characterized in that: The cross section of the material trough is U-shaped.

6. The biomass screw feeder according to claim 1, characterized in that: A pressure sensor is arranged in the material trough.

7. The biomass screw feeder according to claim 1, characterized in that: A wear-resistant layer is arranged on the spiral blade.

8. The biomass screw feeder according to claim 1, characterized in that: It also includes a rotating shaft, which is concentrically arranged with the spiral blade, and the spiral blade is wound around the rotating shaft. One end of the rotating shaft passes through the material trough to be connected to the output end of the driving member.

9. The biomass screw feeder according to claim 8, characterized in that: It also includes at least two bearing seats, which are arranged between the driving member and the rotating shaft, and are used to support the rotating shaft.

10. The biomass screw feeder according to claim 8, characterized in that: A sealing member is provided at the connection between the rotating shaft and the material trough.

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