Inclined screw conveyor with jamming prevention plate

Abstract

The present invention provides an anti-jamming plate that effectively prevents objects being transported from becoming jammed in an inclined screw conveyor. [Solution] The device includes a jamming prevention plate (20) having a main body (22), the main body being a rectangular plate-like member having a pair of opposing first long sides (22a) and second long sides (22b) and a pair of opposing short sides, and an arc (22a1) having approximately the same curvature as the outer edge of the screw blade (18) is formed on the first long side, and is attached to the upper edge of the input opening (12c) or its vicinity such that the distance B between the upper edge of the screw blade and the arc is smaller than the distance A between the upper edge of the screw blade and the inner wall of the casing.

Description

Technical Field

[0001] The present invention relates to an inclined screw conveyor provided with a biting prevention plate.

Background Art

[0002] In various fields, substances are conveyed using a screw conveyor installed in an inclined state (hereinafter referred to as "inclined screw conveyor") (see, for example, Patent Document 1). The inclined screw conveyor is increasingly used for conveying high-hardness substances such as rocks, mixed metals, and metals. In general, an inclined screw conveyor is configured such that a hopper, which is an inlet, is provided at one end, and a substance (hereinafter referred to as "conveyed object") introduced from the hopper is conveyed inside the screw conveyor and discharged outside the screw conveyor from a discharge port provided at the other end.

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the conveyed object is introduced from the hopper, the conveyed object may be bitten between the casing and the screw, causing forced stoppage of the screw or uneven wear of the casing. In particular, the higher the hardness of the conveyed object, the more likely such biting occurs. In the current situation where the conveyance of high-hardness substances is increasing, an effective countermeasure for preventing the biting of the conveyed object is required.

[0005] The present invention has been developed in view of such circumstances, and an object thereof is to provide a biting prevention plate that effectively prevents the biting of the conveyed object in an inclined screw conveyor.

Means for Solving the Problems

[0006] An inclined screw conveyor as described in claim 1 of the present application, comprising an inclined cylindrical casing, one end and the other end of the casing being closed, an input port for conveyed material being provided near the one end of the casing, a shaft with screw blades attached to it being rotatably arranged inside the casing at a location eccentrically downward by a distance X from the center of the casing, the distance between the upper edge of the screw blades and the inner wall of the casing being A, and the distance between the lower edge of the screw blades and the inner wall of the casing being substantially zero, further comprising a jamming prevention plate having a body, the body being a rectangular plate-like member having a pair of opposing first long sides and a pair of opposing short sides, an arc formed on the first long side having approximately the same curvature as the outer edge of the screw blades and curving toward the second long side, and the jamming prevention plate being attached to the upper edge of the input port or its vicinity such that the distance B between the upper edge of the screw blades and the arc is smaller than the distance A.

[0007] The inclined screw conveyor described in claim 2 of this application is characterized in that the main body is made of an elastic material, in the inclined screw conveyor of claim 1.

[0008] The inclined screw conveyor described in claim 3 of this application is characterized in that, in the inclined screw conveyor of claim 1, a plurality of slits are formed in the main body at equidistant intervals parallel to the short side, extending from the first long side to the second long side.

[0009] The inclined screw conveyor according to claim 4 of the present application is characterized in that, in the inclined screw conveyor according to claim 1, the jamming prevention plate has a mounting portion for attaching the main body to a predetermined location on the inclined screw conveyor, the mounting portion is a rectangular plate-shaped member having a pair of opposing long sides and a pair of opposing short sides, and is attached to the second long side of the main body at a predetermined acute angle α with respect to the main body, and the jamming prevention plate is attached by bolting the mounting portion to a predetermined location on the input opening. [Effects of the Invention]

[0010] By installing an anti-jamming plate on an inclined screw conveyor, it is possible to effectively prevent jamming of conveyed material by preventing it from getting stuck in the gap between the casing and the outer edge of the screw blades. Furthermore, by forming the body of the anti-jamming plate from an elastic material or by providing slits, the body can bend flexibly, eliminating the risk of the conveyed material impairing the smooth rotation of the screw blades. In addition, the anti-jamming plate can be easily attached, making it easy to handle. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic cross-sectional view showing the entire inclined screw conveyor equipped with jamming prevention plates. [Figure 2] This is an enlarged cross-sectional view showing part 2 of Figure 1. [Figure 3] This is a schematic diagram showing the position of the shaft within the casing. [Figure 4] Figure 2 is a cross-sectional view taken along arrow 4-4. [Figure 5] Figure 5(a) is a perspective view of an anti-jamming plate according to a preferred embodiment of the present invention, Figure 5(b) is a front view of the anti-jamming plate of Figure 5(a), and Figure 5(c) is a side view of the anti-jamming plate of Figure 5(a). [Figure 6] This is a series of diagrams showing the deformed forms of the anti-jamming plate. [Figure 7] This is a diagram illustrating the operation of the jamming prevention plate. [Modes for carrying out the invention]

[0012] Next, with reference to the drawings, an inclined screw conveyor equipped with a jamming prevention plate according to a preferred embodiment of the present invention will be described. Figure 1 is a schematic cross-sectional view showing the entire inclined screw conveyor equipped with a jamming prevention plate, and Figure 2 is an enlarged cross-sectional view showing part 2 of Figure 1.

[0013] In Figure 1, the inclined screw conveyor, collectively indicated by reference numeral 10, comprises an inclined cylindrical casing 12. One end and the other end of the casing 12 are closed by end walls 12a and 12b, respectively. The conveyed object input port 12c is located near one end of the conveyed object, and the conveyed object discharge port 12d is located near the other end of the conveyed object.

[0014] Inside the casing 12, a shaft 14 is rotatably positioned at a location eccentrically located at a distance X downward from the center C of the casing 12. Figure 3 is a schematic diagram showing the position of the shaft 14 inside the casing 12. The shaft 14 passes through through holes provided in the end walls 12a and 12b via bearings 14a. A drive means 16, such as a motor, and a transmission 16a are connected to one end of the shaft 14, and by rotationally driving the drive means 16, the shaft 14 rotates at a desired rotational speed.

[0015] Screw blades 18 are spirally mounted on the shaft 14. The diameter of the screw blades 18 is selected such that, as best shown in Figure 2, the upper edge maintains a distance A between itself and the inner wall of the casing 12, while the lower edge has virtually no distance between itself and the inner wall of the casing 12.

[0016] In FIG. 5(a), the anti-biting plate according to the preferred embodiment of the present invention, which is generally indicated by reference numeral 20, includes a main body 22 and a mounting portion 24 for attaching the main body 22 to a predetermined location of the inclined screw conveyor 10.

[0017] The main body 22 is a generally rectangular plate-like member having a pair of opposing first long sides 22a and second long sides 22b, and a pair of opposing short sides 22c and 22d. As shown in FIGS. 5(a) and 5(b), on the first long side 22a of the main body 22, an arc 22a1 is formed that has substantially the same curvature as the curvature of the outer edge of the screw blade 18 and curves toward the second long side 22b. In the forms shown in FIGS. 5(a) and 5(b), portions 22a2 and 22a3 where the arc 22a1 is not formed are provided on both sides of the portion where the arc 22a1 is formed, but as shown in FIG. 6(a), a form in which the portions 22a2 and 22a3 are not provided may also be adopted.

[0018] The mounting portion 24 of the anti-biting plate 20 is a generally rectangular plate-like member having a pair of opposing long sides 24a and 24b, and a pair of opposing short sides 24c and 24d. The long sides 24a and 24b have the same length as the long sides 22a and 22b of the main body 22. The mounting portion 24 is attached to the second long side 22b of the main body 22 at a predetermined acute angle α with respect to the main body 22. The acute angle α is preferably 20° to 40°, and most preferably 30°.

[0019] The main body 22 and the mounting portion 24 are formed of an elastic material such as spring steel or rubber. The main body 22 and the mounting portion 24 are preferably integrally formed, but may be formed separately and then integrated by a predetermined method (such as welding or adhesion).

[0020] The anti-biting plate 20 is attached to the upper edge portion of the charging port 12c or its vicinity such that the distance B between the arc 22a1 of the first long side 22a of the main body 22 and the outer edge of the screw blade 18 is smaller than the distance A between the inner wall of the casing 12 and the outer edge of the screw blade 18 (see Fig. 2). The anti-biting plate 20 is attached by any appropriate method such as bolting it to a predetermined location of the charging port 12c using the holes provided in the attachment portion 24 of the anti-biting plate 20.

[0021] Next, mainly referring to Fig. 7, the operation of the anti-biting plate 20 configured as described above will be described. An object to be conveyed is charged from the charging port 12c. Then, since the anti-biting plate 20 is attached to the upper edge portion of the charging port 12c or its vicinity, most of the object to be conveyed falls into the casing 12 without entering the gap between the casing 12 and the outer edge of the screw blade 18. Also, since the distance B is smaller than the distance A, among the objects to be conveyed that have fallen into the casing 12, those with a diameter larger than B are blocked by the lower edge of the anti-biting plate 20, so it is almost impossible to enter the region D between the inner wall of the casing 12 and the outer edge of the screw blade 18.

[0022] As described above, since it is almost impossible for the object to be conveyed to enter the region D, there is no risk that the screw will be forced to stop or that the casing 12 will cause uneven wear.

[0023] Since the anti-biting plate 20 is formed of an elastic material, it is considered that even if an object to be conveyed with a diameter larger than B hits the lower edge of the anti-biting plate 20, the rotational drive of the screw blade 18 will not be substantially inhibited.

[0024] Preferably, a plurality of slits 22a4 are formed in the main body 22 at equal intervals parallel to the short sides 22c and 22d from the first long side 22a toward the second long side 22b. By providing the slit 22a4, even if the elasticity of the main body 22 is small, the main body 22 will bend sufficiently when the object being conveyed hits it, thus reducing the risk of the smooth rotation of the screw blades 18 being hindered.

[0025] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible within the scope of the invention as described in the claims, and these modifications are also included within the scope of the present invention.

[0026] For example, the dimensions and details of each component of the inclined screw conveyor 10 shown in the attached drawings are merely illustrative and not limited to those shown. [Explanation of Symbols]

[0027] 10 Inclined screw conveyor 12 Casing 12a End wall 12b End wall 12c Inlet 12d outlet 14 shafts 16. Driving means (motor) 16a transmission 18 Screw blades 20. Anti-jamming plate 22 Main unit 22a First long side 22a1 arc 22a2, 22a3: Areas where no arc is formed. 22a4 Slit 22b Second long side 22c Short side 22d Short side 24 Mounting part 24a, 24b Longer side 24c, 24d Short side A. Distance between the upper edge of the screw blade and the inner wall of the casing. B. Distance between the arc of the main body and the outer edge of the screw blades Center of the C casing D area X Distance between the center of the casing and the center of the shaft

Claims

1. An inclined screw conveyor has an inclined cylindrical casing, one end and the other end of the casing are closed, an input port for conveyed material is provided near the one end of the casing, a shaft with screw blades attached is rotatably arranged inside the casing at a point eccentrically downward by a distance X from the center of the casing, the distance between the upper edge of the screw blades and the inner wall of the casing is A, and the distance between the lower edge of the screw blades and the inner wall of the casing is substantially zero. Equipped with a bite prevention plate having a main body, The main body is a rectangular plate-like member having a pair of opposing first long sides and second long sides and a pair of opposing short sides, and an arc is formed on the first long side that has approximately the same curvature as the outer edge of the screw blade and curves toward the second long side. An inclined screw conveyor characterized in that the jamming prevention plate is attached to the upper edge of the input opening or its vicinity such that the distance B between the upper edge of the screw blade and the arc is smaller than the distance A.

2. The inclined screw conveyor according to claim 1, characterized in that the main body is made of an elastic material.

3. The inclined screw conveyor according to claim 1, characterized in that a plurality of slits are formed in the main body at equidistant intervals parallel to the short side, extending from the first long side to the second long side.

4. The jamming prevention plate has a mounting portion for attaching the main body to a predetermined location on the inclined screw conveyor, The mounting portion is a rectangular plate-shaped member having a pair of opposing long sides and a pair of opposing short sides, and is attached to the second long side of the main body at a predetermined acute angle α with respect to the main body. The inclined screw conveyor according to claim 1, characterized in that the jamming prevention plate is attached by bolting the mounting part to a predetermined location of the input opening.

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