Shaftless screw conveyor

Abstract

The utility model relates to the technical field of material conveying equipment, in particular to a shaftless spiral conveyor which comprises a power source, a conveying shell and a spiral blade located in the conveying shell, the power source is installed at one end of the conveying shell to drive the spiral blade to rotate, and the conveying shell is installed on the conveying shell. A feeding port and a discharging port are formed in the two ends of the conveying shell correspondingly, connecting shafts are arranged at the two ends of the spiral blade correspondingly, and the two connecting shafts are detachably connected with the first supporting shaft and the second supporting shaft correspondingly. The section of each spiral blade is in a trapezoid shape, a chamfer angle is arranged at the end of the upper bottom edge, away from the center, of each spiral blade, the blade end, located on the side of the feeding port, of each spiral blade is in a vortex line shape, and the blade pitches of the spiral blades are distributed at unequal intervals. According to the device, damage caused by downward bending deformation of the spiral blade and clamping stagnation caused by extrusion of materials can be reduced, and meanwhile, starting power and daily energy consumption can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of material conveying equipment, in particular to a shaftless screw conveyor. Background Art

[0002] With the popularization and application of screw conveyors in various industries, higher requirements are placed on the performance of screw conveyors. Shaftless conveyors have no central shaft and rely on the rotation of shaftless spiral blades to promote material transportation, which greatly avoids damage and failure caused by material blockage and entanglement.

[0003] Chinese utility model patent CN201254388Y discloses a shaftless screw conveyor, including a shaftless spiral blade arranged in a casing, the shaftless spiral blade is driven to rotate by a power device composed of a motor and a reducer, the shaftless spiral blade is of equal diameter and variable pitch, and is divided into two or more sections according to the pitch size, wherein the pitch of the rear section is greater than the pitch of the front section, and the cross-sectional shape of the shaftless spiral blade is a trapezoidal cross-section, and the above-mentioned disclosed scheme can avoid extrusion during material conveying by adopting a variable pitch method, and prevent conveying jams, and at the same time, the blade cross-section adopts a scheme of thickening the trapezoidal root to improve the strength of the blade. However, one end of the spiral blade disclosed in the above scheme is connected to the power device, and the other end thereof is suspended. When the spiral blade is long, the spiral blade will be pressed down under the action of its own weight, and contact and rub against the shell, which is easy to cause fatigue cracking of the spiral blade component, and although the above-mentioned spiral blade has increased strength itself, the starting torque is increased compared with the conventional flat spiral blade, the driving motor power is increased, and the energy consumption is increased. Utility Model Content

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides a shaftless screw conveyor.

[0005] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a shaftless screw conveyor, comprising a power source, a conveying shell and a spiral blade located inside the conveying shell, the power source is installed at one end of the conveying shell to drive the spiral blade to rotate, and a feed port and a discharge port are respectively provided at both ends of the conveying shell, and connecting shafts are provided at both ends of the spiral blade, and the two connecting shafts are respectively detachably connected to a first support shaft and a second support shaft; the cross-sectional shape of the spiral blade is trapezoidal, and the upper bottom edge end away from the center is provided with a chamfer, the blade end of the spiral blade located on the feed port side is in a vortex shape, and the blade pitch of the spiral blade is unequally distributed.

[0006] Preferably, bearings are installed on both the first support shaft and the second support shaft, and the second support shaft is connected to the power source via a coupling.

[0007] Preferably, the spiral blade has a dense pitch at one end close to the feed inlet, and a wide pitch at one end away from the feed inlet.

[0008] Preferably, the pitch value of the dense pitch is A, the pitch value of the wide pitch is B, the A value satisfies 0.5B≤A<B, and the B value is equal to the nominal diameter of the conveying shell.

[0009] Preferably, the length of the lower base of the spiral blade close to the center is greater than the length of the upper base away from the center, and the ratio of the lower base length to the upper base length is 1.5 to 2.5.

[0010] Preferably, a reinforcing rib plate is provided at the end of the connection position between the increased pitch and the connecting shaft.

[0011] The beneficial effects of the utility model are:

[0012] 1. The two ends of the spiral blade are respectively connected to the first support shaft and the second support shaft through a connecting shaft. Bearings are installed on the connection between the first support shaft and the second support shaft, which not only ensures the smooth rotation of the spiral blade, but also supports both ends of the spiral blade, so that the force is more uniform and the vibration is smaller during operation. It avoids the downward bending and deformation of the spiral blade when the conventional spiral blade is supported by a cantilever. At the same time, it can also avoid the problem of excessive torque at the support point when the cantilever is supported, thereby extending the service life of the equipment.

[0013] 2. When the equipment starts, the starting torque is greater than the torque during normal operation. In order to reduce the starting torque of the equipment, reduce the power configuration of the power source, and reduce the energy consumption in daily use, the end of the spiral blade at the feed inlet is in a vortex shape. The vortex arc setting can reduce the resistance of the spiral blade to shovel into the material when it is initially started, and the end of the spiral blade is set to a chamfered blade shape, which further reduces the resistance of the spiral blade to shovel into the material, and at the same time, it can also avoid the phenomenon of material getting stuck between the spiral blade and the inner wall of the conveying shell.

[0014] 3. The spiral blade adopts a design method of increasing the pitch from the feed port to the discharge port, which increases the conveying capacity of the spiral blade and avoids the extrusion of materials during the conveying process, thereby increasing the conveying torque and even causing conveying jams.

[0015] 4. The spiral blade at the end of the feed port has greater resistance and friction when shoveling into the material, so it is prone to cracking and wear. In order to increase the strength of its end, a reinforcing rib plate is added at its end to increase the connection strength with the connecting shaft and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of the overall structure of the utility model;

[0017] Figure 2 This is the front view of the spiral blade of the utility model;

[0018] Figure 3 This is a three-dimensional diagram of the spiral blade of the utility model;

[0019] Figure 4 For this utility model Figure 2 A partial enlarged view of the middle C area;

[0020] Figure 5 For this utility model Figure 1 A partial enlarged view of the D area in the middle;

[0021] Figure 6 It is the right side view of the spiral blade of the utility model.

[0022] In the figure, 1. power source; 2. coupling; 3. conveying shell; 4. spiral blade; 5. feed port; 6. bearing; 7. first support shaft; 8. connecting shaft; 9. discharge port; 10. second support shaft; 11. increased pitch; 12. wide pitch; 13. chamfer; 14. blade end; 15. reinforcing rib plate; 16. upper bottom edge; 17. lower bottom edge. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 To Attachment Figure 6 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, and are not used to limit the scope of the present invention.

[0024] Embodiment 1:

[0025] A shaftless screw conveyor, such as Figure 1 — Figure 2As shown, it includes a power source 1, a conveying shell 3 and a spiral blade 4 located inside the conveying shell 3. The spiral blade 4 adopts a structure without a central axis. The conveying shell 3 is made of a standard hot-rolled steel pipe, and a feed port 5 and a discharge port 9 are respectively provided at both ends thereof. The feed port 5 can be connected to an external feeding device. In order to reduce the driving torque of the power source 1 and reduce daily energy consumption, the blade pitch of the spiral blade 4 is distributed in an unequal distance. The end of the spiral blade 4 close to the feed port 5 is a dense pitch 11, and the end away from the feed port 5 is provided with a wide pitch 12. During the material conveying process, as the pitch increases, the conveying capacity is enhanced, which can prevent the extrusion of the material during the conveying process and cause the conveying jam. However, the smaller the pitch at the feed port 5 is, the smaller the conveying volume of the screw conveyor per unit time is. In order to ensure the conveying efficiency of the screw conveyor, the pitch value of the dense pitch 11 is defined as A, and the pitch value of the wide pitch 12 is defined as B. The A value satisfies 0.5B≤A<B, and the B value is equal to the nominal diameter of the conveying shell 3. In this embodiment, the nominal diameter of the conveying shell 3 is DN300, that is, the B value is 300mm, and the A value is 0.5×B, that is, 150mm.

[0026] The ends of the dense pitch 11 and the wide pitch 12 are both provided with connecting shafts 8, and the two connecting shafts 8 are respectively detachably connected to the first support shaft 7 and the second support shaft 10 by bolts, so as to facilitate the later maintenance of the spiral blades 4; bearings 6 are both installed on the first support shaft 7 and the second support shaft 10, which can effectively support the two ends of the spiral blade 4 and make its rotation more flexible, preventing the spiral blade 4 from vibrating excessively during rotation due to deformation and causing damage to components. In order to prevent materials or foreign matter from entering the bearings 6 during the conveying process, sealing devices are provided at the front ends of the two sets of bearings 6.

[0027] The power source 1 is connected to the second support shaft 10 through the coupling 2, which can drive the spiral blade 4 to rotate and feed. The second support shaft 10 can be connected to the connecting shaft 8 at either end of the spiral blade 4. In this embodiment, the power source 1 is an electric motor, which is installed on the conveying shell 3 near one end of the discharge port 9. Of course, the power source 1 can also be a hydraulic motor well known to those skilled in the art.

[0028] like Figure 3 — Figure 6As shown, in order to improve the strength of the core of the spiral blade 4, the cross-sectional shape of the spiral blade 4 is trapezoidal, and the length of the lower base 17 close to the center is greater than the length of the upper base 16 away from the center. In this embodiment, the ratio of the length of the lower base 17 to the length of the upper base 16 is 2.5, that is, the length of the lower base 17 is 25mm, and the length of the upper base 16 is 10mm. The end of the upper base 16 is provided with a chamfer 13, so that the end is blade-shaped, which can reduce the resistance when shoveling materials, and can also reduce the stuck materials between the spiral blade 4 and the inner wall of the conveying shell 3. In order to further reduce the resistance of the end of the spiral blade 4 to shovel materials, the blade end 14 of the spiral blade 4 located on the side of the feed port 5 is in a vortex shape. At the same time, in order to avoid cracking due to excessive resistance and friction when the spiral blade 4 shovels materials, and to extend the service life of the equipment, a reinforcing rib plate 15 is provided at the end of the connecting position of the encrypted pitch 11 and the connecting shaft 8.

[0029] Embodiment 2:

[0030] The difference from Example 1 is that in this embodiment: Figure 1 and Figure 5 The values ​​of A, B, the length of the upper base 16, and the length of the lower base 17 are shown in Table 1, Example 2 in the dimension value comparison table.

[0031] Embodiment 3:

[0032] The difference from Example 1 is that in this embodiment: Figure 1 and Figure 5 The values ​​of A, B, the length of the upper base 16, and the length of the lower base 17 are shown in Table 1, Example 3 in the dimension value comparison table.

[0033] Table 1: Size comparison table

[0034]

[0035] During operation, ensure that the pipelines at the feed port 5 and the discharge port 9 are connected smoothly. When the power source 1 is powered on, first observe the rotation direction of the power source 1 by jogging. If the rotation direction is clockwise when facing the tail of the power source 1, the direction is correct. After the rotation direction is correctly determined, start the power source 1. The power source 1 drives the spiral blade 4 to rotate smoothly under the action of the bearing 6, so that the material entering from the feed port 5 can be transported to the discharge port 9 and fall down through the action of the spiral blade 4. During the whole process, the equipment runs smoothly without friction, abnormal noise, or jamming.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shaftless screw conveyor, comprising a power source (1), a conveying shell (3) and a spiral blade (4) located inside the conveying shell (3), wherein the power source (1) is mounted on one end of the conveying shell (3) to drive the spiral blade (4) to rotate, and a feed port (5) and a discharge port (9) are respectively provided at both ends of the conveying shell (3), characterized in that: Both ends of the spiral blade (4) are provided with connecting shafts (8), and the two connecting shafts (8) are detachably connected to the first support shaft (7) and the second support shaft (10) respectively; the cross-sectional shape of the spiral blade (4) is trapezoidal, and the end of the upper bottom edge (16) away from the center is provided with a chamfer (13); the blade end (14) of the spiral blade (4) located on the side of the feed port (5) is in the shape of a spiral line, and the blade pitch of the spiral blade (4) is distributed at unequal intervals.

2. The shaftless screw conveyor according to claim 1, characterized in that: The first support shaft (7) and the second support shaft (10) are both installed with bearings (6), and the second support shaft (10) is connected to the power source (1) via a coupling (2).

3. The shaftless screw conveyor according to claim 1, characterized in that: The end of the spiral blade (4) close to the feed inlet (5) is provided with a dense pitch (11), and the end away from the feed inlet (5) is provided with a wide pitch (12).

4. The shaftless screw conveyor according to claim 3, characterized in that: The pitch value of the dense pitch (11) is A, the pitch value of the wide pitch (12) is B, the A value satisfies 0.5B≤A<B, and the B value is equal to the nominal diameter of the conveying shell (3).

5. The shaftless screw conveyor according to claim 1, characterized in that: The length of the lower base (17) of the spiral blade (4) close to the center is greater than the length of the upper base (16) away from the center, and the ratio of the length of the lower base (17) to the length of the upper base (16) is 1.5 to 2.

5.

6. The shaftless screw conveyor according to claim 3, characterized in that: A reinforcing rib plate (15) is provided at the end of the connection position between the increased pitch (11) and the connecting shaft (8).

Images