Shaftless screw conveyor with double-screw diameter

Abstract

The utility model discloses a shaftless spiral conveyor with double spiral diameters, and belongs to the technical field of sewage treatment transportation equipment. The device comprises a conveying groove body, spiral blades are installed in the conveying groove body, the conveying groove body comprises a first conveying groove body and a second conveying groove body which are the same in length, a feeding port is formed in the top of the first conveying groove body, a discharging port is formed in the bottom of the second conveying groove body, and the volume of the first conveying groove body is smaller than that of the second conveying groove body; the spiral blades comprise the first spiral blade located in the first conveying groove body, the first spiral blade with a small part located in the second conveying groove body and the second spiral blade with the whole part located in the second conveying groove body, and the diameter of the first spiral blade is smaller than that of the second spiral blade. By arranging the conveying groove bodies and the spiral blades which are different in size, the problem of material blockage of the discharging port is effectively solved by improving the conveying capacity of a local area, and the conveying requirements of different materials in different conveying environments can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment and transportation equipment, and more specifically relates to a shaftless screw conveyor with a double screw diameter. Background Art

[0002] The shaftless screw conveyor is a common sewage treatment conveying equipment, which is often used for the transportation of screens and sludge in sewage treatment. The sludge is pushed and transported by the rotating shaftless screw. The sludge is transported by the conveyor and finally falls into the truck for transportation and final treatment.

[0003] At present, most of the shaftless screw conveyors on the market, during the material conveying process, because the sludge discharge order of the plate and frame filter press is from front to back, the traditional shaftless screw conveyor has a single screw diameter, which makes it very easy for sludge to accumulate at the discharge port of the shaftless screw conveyor, causing blockage, and even squeezing the spiral blades in severe cases, causing damage to the conveyor. At the same time, the traditional shaftless screw conveyor is limited in adjusting the material conveying volume and conveying speed, and it is difficult to meet the conveying speed and conveying volume requirements of different materials.

[0004] After searching, there are relevant patents disclosed about shaftless screw conveyors, such as the Chinese patent application number: 202223570125.7, the application date is December 30, 2022, and the name of the invention is: a single screw conveyor. The screw conveyor disclosed in the application includes a conveying pipe, a screw shaft and a power device; the side wall of the conveying pipe is provided with a feed port and a discharge port with openings facing opposite directions; the screw shaft is rotatably installed in the conveying pipe, and the screw shaft is provided with a feed section, a discharge section and a reverse thrust section in sequence, the feed section is arranged between the feed port and the discharge port, the discharge section is directly opposite to the discharge port, and the reverse thrust section is arranged between the discharge port and the closed end of the conveying pipe, the feed section is provided with a forward thrust blade, and the reverse thrust section is provided with a reverse thrust blade; the power device drives the screw shaft to rotate in the conveying pipe; in this application, by providing a forward thrust blade on the feed section and a reverse thrust blade on the reverse thrust section, the accumulation of sludge at the discharge port and the blockage caused by it can be alleviated to a certain extent. However, the shaftless screw conveyor provided in the application has a single screw diameter, which limits its conveying capacity and conveying speed and cannot fundamentally solve the problem of material accumulation at the discharge port. Utility Model Content

[0005] 1. Problem to be solved

[0006] In view of the problem that when the existing shaftless screw conveyor transports sludge, due to its single screw diameter, materials are easily accumulated at the discharge port, causing blockage. The utility model provides a shaftless screw conveyor with a double screw diameter, which is provided with conveying troughs and double screw diameter blades of different sizes. The method of increasing the conveying capacity in the local area effectively solves the problem of material blockage at the discharge port, and can meet the conveying needs of different materials in different conveying environments.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0009] The utility model discloses a shaftless screw conveyor with double spiral diameters, comprising a conveying trough body, wherein the conveying trough body comprises a first conveying trough body and a second conveying trough body, and a spiral blade is installed in the conveying trough body, wherein:

[0010] The top of the first conveying trough body is provided with a feed port, the bottom of the second conveying trough body is provided with a discharge port, the first conveying trough body and the second conveying trough body are of the same length, and the volume of the first conveying trough body is smaller than that of the second conveying trough body;

[0011] The spiral blades include a first spiral blade located in the first conveying trough body, a small portion of the first spiral blade located in the second conveying trough body, and a second spiral blade located entirely in the second conveying trough body, and the diameter of the first spiral blade is smaller than the diameter of the second spiral blade;

[0012] The bottom of the first spiral blade is in close contact with the bottom of the first conveying trough body, and the bottom of the second spiral blade is in close contact with the bottom of the second conveying trough body.

[0013] Furthermore, the ratio of the diameters of the first spiral blade to the second spiral blade is 1.2 to 1.8.

[0014] Furthermore, the pitch ratio of the first spiral blade to the second spiral blade is 1.4-1.8.

[0015] Furthermore, a cleaning brush is installed on one side of the blade body of the second spiral blade, and spirally distributed mud-breaking blades are installed on the other side thereof, and the cleaning brush protrudes from the top of the blade body and extends upward.

[0016] Furthermore, the distance between the top of the first spiral blade and the top of the first conveying trough body is recorded as d1, and the distance between the top of the cleaning brush on the second spiral blade and the top of the second conveying trough body is recorded as d2, and d1<d2.

[0017] Furthermore, d1=(2~3)d2.

[0018] Furthermore, it also includes a driving device, which is arranged on the cover plate at one end of the first conveying trough body and is used to drive the spiral blades in the conveying trough body to rotate.

[0019] Furthermore, the driving device includes a driving motor and a reducer, the output shaft of the driving motor is connected to the reducer, and the output shaft of the reducer is connected to the spiral blade.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] (1) The double-helix diameter shaftless screw conveyor of the utility model conveys sludge by setting the conveying trough body into two specifications, one large and one small, and arranging spiral blades of two spiral diameters in the conveying trough bodies of different specifications. This effectively solves the problem that the conventional shaftless screw conveyor may be clogged with materials at the discharge port during the material conveying process, thereby damaging the spiral blades, and is beneficial to improving the material conveying capacity and service life.

[0023] (2) The double-helix diameter shaftless screw conveyor of the utility model not only fundamentally solves the problem of material blockage by optimizing the diameter and pitch of the two spiral blades, but more importantly, compared with the conveyor with a single spiral diameter, the conveyor of the utility model has a wider range of adjustment for the conveying speed and conveying volume of materials, and can better adapt to the requirements of different materials for conveying speed and conveying volume.

[0024] (3) The double-helix diameter shaftless screw conveyor of the utility model has a brush and a mud-breaking blade installed on the second spiral blade. When there is too much sludge accumulation, the sludge can be broken up to prevent the sludge from agglomerating and hardening to block the conveyor.

[0025] The shaftless screw conveyor of the utility model has a simple structure, a reasonable design and is easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a shaftless screw conveyor with double screw diameters of the utility model;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the screw conveyor of the utility model;

[0028] Figure 3 It is a three-dimensional structural schematic diagram of the spiral blade of the utility model;

[0029] Figure 4 It is a schematic diagram of the three-dimensional structure of the second spiral blade of the utility model.

[0030] In the figure:

[0031] 1. Driving device; 2. Feeding port; 3. First conveying trough body; 4. Second conveying trough body; 5. Discharging port; 6. First spiral blade; 7. Second spiral blade; 701. Blade body; 702. Cleaning brush; 703. Mud-breaking blade; 8. Cover plate. DETAILED DESCRIPTION

[0032] It should be noted that it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] The utility model is further described below in conjunction with specific embodiments.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a double-helix diameter shaftless screw conveyor, including a driving device 1 and a conveying trough, wherein the conveying trough includes

[0037] The first conveying trough body 3 and the second conveying trough body 4 are provided with a feed port 2 near the head of the first conveying trough body 3 and at the top of the first conveying trough body 3 for feeding sludge. A discharge port 5 is provided near the tail of the second conveying trough body 4 and at the bottom of the second conveying trough body 4 for discharging sludge.

[0038] The first conveying trough body 3 and the second conveying trough body 4 have the same length, and the volume of the first conveying trough body 3 is smaller than that of the second conveying trough body 4. Specifically, Figure 1 and Figure 2As shown, the width and height of the first conveying trough body 3 of this embodiment are smaller than those of the second conveying trough body 4, forming two conveying trough bodies with a larger volume and a smaller volume. When arranged, the first conveying trough body 3 with a smaller volume is arranged in front, and the second conveying trough body 4 with a larger volume is arranged in the back. After the sludge enters from the feed port 2, it is first conveyed through the first conveying trough body 3, and then enters the second conveying trough body 4 with a larger volume for conveying, and is discharged from the discharge port 5. The above-mentioned structural design of this embodiment increases the local volume of the conveying trough body and the method of increasing the sludge conveying amount to ensure that the discharge port will not be blocked, so as to meet the conveying environment in different situations, and has a wide range of uses, especially for the conveying of materials with a large conveying amount, which significantly reduces the situation of material blockage at the discharge port 5.

[0039] like Figure 1-3 As shown, cover plates 8 are installed at both ends of the conveying trough body, and spiral blades are installed inside the conveying trough body, and one end of the spiral blades is connected to the driving device 1. Specifically, the driving device 1 includes a driving motor and a reducer, the output shaft of the driving motor is connected to the reducer, and the output shaft of the reducer is connected to the spiral blade to provide power to drive the spiral blade to rotate.

[0040] Specifically, Figure 2 As shown, the spiral blades include a first spiral blade 6 located in the first conveying trough body 3, a small part of the first spiral blade 6 located in the second conveying trough body 4, and a second spiral blade 7 located entirely in the second conveying trough body 4, and the diameter of the first spiral blade 6 is smaller than the diameter of the second spiral blade 7. By arranging two spiral blades of different diameters to convey the sludge, the conveying amount of the sludge can be effectively increased. On the one hand, the accumulation of sludge in the conveying trough body can be reduced, and the sludge blocking at the discharge port 5 can be prevented; on the other hand, by partially increasing the volume of the conveying trough body and increasing the diameter of some spiral blades, the manufacturing cost can be reduced to a certain extent, which not only solves the blocking problem of the existing shaftless screw conveyor, but also saves costs.

[0041] More optimally, in this embodiment, the bottom of the first spiral blade 6 is in close contact with the gap at the bottom of the first conveying trough body 3, and the bottom of the second spiral blade 7 is in close contact with the gap at the bottom of the second conveying trough body 4. The advantage of such a design is that the service life of the spiral blade can be improved, so that the sludge entering the conveying trough body can be fully transported to the rear section of the trough body without causing blockage, and the shaftless screw conveyor of this embodiment is mainly used for sludge transportation. By optimizing the gap between the spiral blade and the conveying trough body, it can be ensured that the sludge is smoothly transported to the rear section of the conveying trough body, and it is not easy to accumulate and agglomerate. In addition, it is worth noting that the shaftless screw conveyor of the utility model is equipped with a first spiral blade 6 at the front end of the second conveying trough body 4, and the bottom of the first spiral blade 6 is at a large distance from the bottom of the second conveying trough body 4, which is convenient for the sludge to enter the second conveying trough body 4 smoothly, and improve the local conveying speed and conveying amount of the sludge, effectively alleviate the conveying pressure of the first conveying trough body 3, avoid blockage, and help to improve the material conveying amount of the entire conveyor.

[0042] Example 2

[0043] The main structure of the double-helix diameter shaftless screw conveyor of this embodiment is basically the same as that of embodiment 1. The difference between it and embodiment 1 is that the ratio of the diameter of the first spiral blade 6 and the second spiral blade 7 is 1: (1.2-1.8), which is specifically 1: 1.5 in this embodiment. By designing the diameters of two spiral blades of different sizes and meeting the ratio range of the present invention, the material blocking problem can be solved. Furthermore, the ratio of the pitch of the first spiral blade 6 and the second spiral blade 7 is 1.4-1.8. The specific ratio in this embodiment is 1: 1.6. This design not only takes into account the material conveying power, but also saves manufacturing costs. At the same time, during the design, the pitch of the spiral blade is usually smaller than the diameter of the spiral blade. After determining the diameter of the spiral blade of appropriate specifications, the pitch size of the designed spiral blade can be adjusted according to actual conditions.

[0044] It is worth noting that according to the calculation formula of the conveying capacity of the shaftless screw conveyor:

[0045] Im=47ψρΦD 2Sn, where Im is the mass conveying capacity; ψ is the inclination coefficient; ρ is the bulk density of the material; Φ is the filling coefficient; D is the screw diameter; S is the pitch, and n is the rotation speed. When the conveyed material is known, the bulk density ρ, the filling coefficient Φ and the inclination coefficient ψ of the material are fixed values, and the mass conveying capacity of the material is determined by the screw diameter D, the pitch S and the rotation speed n. Due to the shaftless screw conveyor, the range of increasing the material conveying capacity by increasing the rotation speed n of the spiral blade is extremely limited, because the shaftless screw conveyor is only connected to the reducer at one end, and the whole is placed on the trough body. If the rotation speed is too large, the spiral blade of the screw conveyor is easy to drift or even bounce upward during the material conveying process, causing damage to the spiral blade. Therefore, in the utility model, by setting two spiral blades of different spiral diameters, and optimizing the diameter size ratio of the two spiral blades and the pitch size ratio of the two spiral blades, the conveying quality of the material can be effectively improved, the material blocking problem of the equipment discharge port 5 can be solved, and the manufacturing cost of the equipment can also be greatly reduced.

[0046] Example 3

[0047] like Figure 4 As shown, the main structure of the double-helix diameter shaftless screw conveyor of this embodiment is basically the same as that of embodiment 1, and the difference between it and embodiment 1 is that: a cleaning brush 702 is installed on one side of the blade body 701 of the second spiral blade 7, and a spirally distributed mud-breaking blade 703 is installed on the other side, and the cleaning brush 702 protrudes from the top of the blade body 701 and extends upward. Since the sludge has a certain viscosity, after entering the shaftless screw conveyor, the sludge is easily gathered together to form a sticky block during the transportation process of the conveying trough body, and the more it is transported to the rear section of the conveying trough body, the higher the difficulty of transportation, and it is easy to cause accumulation in the rear section of the conveyor trough body, thereby affecting the subsequent sludge transportation, which greatly affects the normal use of the shaftless screw conveyor and brings great inconvenience to the transportation work. The screw conveyor of this embodiment, by arranging the cleaning brush 702 and the mud-breaking blade 703 on the second spiral blade 7, can effectively break the sludge that is stuck into blocks, and prevent the problem of sludge agglomeration blocking the conveyor.

[0048] Furthermore, the distance between the top of the first spiral blade 6 and the top of the first conveying trough body 3 is recorded as d1, and the distance between the top of the cleaning brush 702 on the second spiral blade 7 and the top of the second conveying trough body 4 is recorded as d2, d1<d2. Since the conveying capacity of the first conveying trough 3 of the double-helix diameter shaftless screw conveyor of the utility model is smaller than that of the second conveying trough 4, such a design reserves a larger space in the first conveying trough body 3, which can cope with more conveying environments and effectively prevents material from being blocked in the first conveying trough body 3.

[0049] More optimally, when d1 satisfies d1=(2-3)d2, in this embodiment, d1=2.5d2 is preferred, which can further avoid material blockage in the first conveying trough 3 while ensuring the material conveying amount and conveying speed.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shaftless screw conveyor with double screw diameter, characterized in that: The invention comprises a conveying trough body, wherein the conveying trough body comprises a first conveying trough body (3) and a second conveying trough body (4), and spiral blades are installed in the conveying trough bodies, wherein: The top of the first conveying trough body (3) is provided with a feed port (2), the bottom of the second conveying trough body (4) is provided with a discharge port (5), the first conveying trough body (3) and the second conveying trough body (4) are of the same length, and the volume of the first conveying trough body (3) is smaller than that of the second conveying trough body (4); The spiral blades include a first spiral blade (6) located in the first conveying trough body (3), a small portion of the first spiral blade (6) located in the second conveying trough body (4), and a second spiral blade (7) located entirely in the second conveying trough body (4), and the diameter of the first spiral blade (6) is smaller than the diameter of the second spiral blade (7); The bottom of the first spiral blade (6) is in close contact with the bottom of the first conveying trough body (3), and the bottom of the second spiral blade (7) is in close contact with the bottom of the second conveying trough body (4).

2. The double-screw diameter shaftless screw conveyor according to claim 1, characterized in that: The ratio of the diameters of the first spiral blade (6) to the second spiral blade (7) is 1.2 to 1.

8.

3. The double-diameter shaftless screw conveyor according to claim 1, characterized in that: The pitch ratio of the first spiral blade (6) to the second spiral blade (7) is 1.4 to 1.

8.

4. The shaftless screw conveyor with double helix diameter according to any one of claims 1 to 3, characterized in that: A cleaning brush (702) is installed on one side of the blade body (701) of the second spiral blade (7), and a spirally distributed mud-breaking blade (703) is installed on the other side. The cleaning brush (702) protrudes from the top of the blade body (701) and extends upward.

5. The double-diameter shaftless screw conveyor according to claim 4, characterized in that: The distance between the top of the first spiral blade (6) and the top of the first conveying trough (3) is recorded as d1, and the distance between the top of the cleaning brush (702) on the second spiral blade (7) and the top of the second conveying trough (4) is recorded as d2, d1<d2.

6. The double-screw diameter shaftless screw conveyor according to claim 5, characterized in that: d1=(2~3)d2.

7. The shaftless screw conveyor with double helix diameter according to any one of claims 1 to 3, characterized in that: It also comprises a driving device (1), which is arranged on a cover plate (8) at one end of the first conveying trough body (3) and is used to drive the spiral blades in the conveying trough body to rotate.

8. The shaftless screw conveyor with double screw diameter according to claim 7, characterized in that: The driving device (1) comprises a driving motor and a reducer, wherein the output shaft of the driving motor is connected to the reducer, and the output shaft of the reducer is connected to the spiral blade.

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