Impeller of a ring flaker

Abstract

The present invention discloses an impeller of a ring-type flaker, comprising a wheel shell, blades and bolts, wherein the wheel shell is welded by a wheel ring, a wheel plate, a shaft sleeve, a cone liner and a plurality of blades, the blades are evenly arranged along the circumference of the wheel ring, the two sides of the blades are respectively welded to the wheel ring and the wheel plate, the projection of any blade in the axial direction of the impeller is in a curved shape, and the blades are composed of a combination of an arc plate and a straight plate, wherein the straight plate part of the blade is arranged in a radial radial shape, and the inner side of the arc of the arc plate part follows the direction of rotation of the impeller. The beneficial effect of this structure is that the aerodynamic characteristics of the impeller are optimized, the stirring effect of the impeller on the airflow is reduced when the impeller rotates at high speed, the aerodynamic noise of the air in the high-speed rotating impeller is reduced, and the operating energy consumption is reduced; the movement trajectory of the feeding wood chips in the impeller is optimized, the friction of the wood chips when sliding on the blades is reduced, the wear of the blades is reduced, the situation that the wood chips are broken by the blades is reduced, and the efficiency of the impeller feeding wood chips is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wood shavings preparation, in particular to an impeller of a ring-type flaking machine. Background Art

[0002] The ring flaker is one of the main machines for preparing wood chips in particleboard production. The impeller of the ring flaker plays a very important role in the entire feeding and cutting feed system, mainly including: ① The rotation of the impeller generates airflow to form a negative pressure in the heavy object separator, sucking the wood chips into the cutting chamber, playing the role of airflow assisting feeding; ② The wood chips entering the high-speed rotating impeller are forced to rotate and perform centrifugal motion, and are radially thrown toward the knife ring, playing a feeding role; ③ In the planing mechanism composed of the impeller and the knife ring of the ring flaker, the impeller forces the wood chips to rotate and perform centrifugal motion. The centrifugal force generated gives the wood chips a pressure that is close to the inner wall of the knife ring. At the same time, the blades support the wood chips and play the role of bottom knife during planing.

[0003] However, the impellers on the existing ring-type chippers generally adopt a radial straight-plate impeller structure. Although this impeller has a simple structural design and is easy to maintain, it often causes the following problems when working in a high-speed rotating state: ① Without optimization of aerodynamic characteristics, the straight-plate impeller greatly stirs the air in the cutting chamber when rotating at high speed, which is easy to increase aerodynamic noise and increase energy consumption; ② When the impeller with a radial straight-plate impeller structure transports wood chips to the knife ring through centrifugal action, the wood chips tend to slide on the impeller, resulting in low transport efficiency and easy wear of the impeller; ③ When the straight-plate impeller and blades force the wood chips inside the impeller to rotate, the wood chips are easily broken by the impeller, which also increases energy consumption. Summary of the invention

[0004] In order to solve the problems of poor aerodynamic characteristics, low wood chip feeding efficiency, easy wear of the blades, high energy consumption, etc. existing in the above-mentioned ring-type chipper adopting a radial straight plate impeller structure, the present invention provides a ring-type chipper impeller whose impellers are composed of arc plates and straight plates.

[0005] To achieve the above purpose, the present invention adopts the following technical solution.

[0006] An impeller of a ring-type flaker comprises a wheel shell, blades and bolts, wherein the wheel shell is welded by a wheel ring, a wheel plate, a shaft sleeve, a conical liner and a plurality of blades, wherein the blades are evenly arranged along the circumference of the wheel ring, and the two sides of the blades are respectively welded to the wheel ring and the wheel plate, and characterized in that the projection of any blade in the axial direction of the impeller is in a curved shape, and the blades are composed of a combination of an arc plate and a straight plate, wherein the straight plate portion of the blade is radially arranged, and the angle between the straight plate portion and the tangent direction of the impeller is β, and the blades are used for installing the blades; the inner side of the arc of the arc plate portion of the blade follows the direction of rotation of the impeller, and the radius of the arc plate portion in the axial direction of the impeller is R, and the end of the arc plate close to the knife ring is tangent to the straight plate portion of the blade on which the blade is installed, and the angle between the tangent of the arc plate at the tail end toward the impeller axis and the tangent direction of the impeller is α, and the radius R of the arc plate satisfies the formula H is the total height of the blade, and h is the height of the straight plate portion of the blade on which the blade is mounted.

[0007] The beneficial effect of this structure is that the blade composed of a circular arc plate and a straight plate is more conducive to the flow of gas-solid two-phase flow in a high-speed rotating impeller than a straight plate blade, thereby optimizing the aerodynamic characteristics of the impeller, reducing the stirring effect on the airflow when the impeller rotates at high speed, reducing the aerodynamic noise generated during the high-speed rotation of the impeller, and reducing the operating energy consumption; optimizing the movement trajectory of the feeding wood chips in the impeller, reducing the friction when the wood chips slide on the blade, reducing the wear of the blade, and improving the efficiency of the impeller feeding wood chips; reducing the situation of wood chips being broken by the blade. The part of the top of the blade plate where the blade is installed maintains a straight plate structure, so that the straight plate blade can be tightly and firmly installed on the blade plate by bolts.

[0008] As a further improvement, the angle α satisfies 20°<α<45°. The beneficial effect of this structure is that the angle α is not too small, ensuring that the wood chips can smoothly enter the impeller.

[0009] As a further improvement, the angle α=36°.

[0010] As a further improvement, the angle β = 90°. The beneficial effect of this structure is that the straight plate part at the top of the blade is arranged radially, so that the top of the blade is perpendicular to the tangential direction of the impeller, ensuring that the blade can normally support the wood chip on the knife ring for planing.

[0011] In summary, the beneficial effects of the present invention are: providing a ring-type chipper impeller whose impellers are composed of arc plates and straight plates, solving the problems of poor aerodynamic characteristics, low efficiency of centrifugal conveying of wood chips, easy wear of impellers, high energy consumption, etc. of the currently commonly used radial straight plate impellers, reducing noise, operating energy consumption and impeller wear, reducing the situation of wood chips being broken by impellers, and improving the efficiency of the impeller in feeding wood chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the impeller of the present invention.

[0013] Figure 2 It is a three-dimensional structural schematic diagram of the impeller and the knife ring of the present invention assembled together.

[0014] Figure 3 It is a front view of the impeller of the present invention.

[0015] Figure 4 It is a left side view of an impeller of the present invention.

[0016] Figure 5 It is an AA cross-sectional view of the impeller front view of the present invention.

[0017] Figure 6 It is a three-dimensional structural schematic diagram of the impeller blades and blades of the present invention.

[0018] Figure 7 It is a left side view of the impeller blade and blades of the present invention.

[0019] Figure numbers: 1-bolt, 2-blade, 3-blade, 4-wheel ring, 5-wheel plate, 6-shaft sleeve, 7-conical bushing, 8-impeller, 9-knife ring, α-angle between the tangent of the arc plate tail end of the blade and the tangent direction of the impeller, β-angle between the straight plate at the top end of the blade and the tangent direction of the impeller, R-arc radius of the arc plate of the blade projected on the axial direction of the impeller, H-total height of the blade, h-height of the straight plate part of the blade on which the blade is installed. DETAILED DESCRIPTION

[0020] The technical solutions in the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, an impeller of a ring-type flaker comprises a wheel shell, blades 3 and bolts 1, wherein the wheel shell is welded by a wheel ring 4, a wheel plate 5, a shaft sleeve 6, a cone liner 7 and a plurality of blades 2, wherein the blades 2 are uniformly arranged along the circumference of the wheel ring 4, and the two sides of the blades 2 are respectively welded to the wheel ring 4 and the wheel plate 5, and characterized in that the axial projection of any blade 2 on the impeller 8 is curved, and the blades 2 are composed of a combination of an arc plate and a straight plate, and the straight plate portion of the blade 2 is radially arranged, and the angle between the straight plate portion and the tangent direction of the impeller 8 is β, and the blades 3 are installed; the inner side of the arc of the arc plate portion of the blade 2 follows the direction of rotation of the impeller 8, and the radius of the arc plate portion on the impeller 8 is R, and the end of the arc plate close to the knife ring 9 is tangent to the straight plate portion of the blade 3 installed on the impeller 2, and the angle between the tangent of the arc plate at the tail end toward the axis of the impeller 8 and the tangent direction of the impeller 8 is α, and the radius R of the arc plate satisfies the formula H is the total height of the blade plate 2, and h is the height of the straight plate portion of the blade plate 2 where the blades 3 are mounted.

[0022] When H=200mm,h=50mm,

[0023] The beneficial effect of this structure is that the impeller 2 composed of a circular arc plate and a straight plate is more conducive to the flow of the gas-solid two-phase flow in the high-speed rotating impeller 8 than the straight plate impeller, thereby optimizing the aerodynamic characteristics of the impeller 8, reducing the stirring effect of the impeller 8 on the airflow when the impeller 8 rotates at high speed, reducing the aerodynamic noise in the high-speed rotating impeller 8, and reducing the operating energy consumption; optimizing the movement trajectory of the feed wood chips in the impeller 8, reducing the friction of the wood chips when sliding on the impeller 2, reducing the wear of the impeller 2, and improving the efficiency of the impeller 8 in feeding wood chips; reducing the situation where the wood chips are broken by the impeller 2.

[0024] like Figure 5 , Figure 6 and Figure 7 As shown, the angle α satisfies 20°<α<45°. The beneficial effect of this structure is that the angle α is not too small, ensuring that the wood chips can smoothly enter the impeller 8.

[0025] like Figure 5 , Figure 6 and Figure 7 As shown, α=36°, when H=200mm, h=50mm, R=185.41mm.

[0026] like Figure 5 , Figure 6 and Figure 7As shown, the angle β = 90°. The beneficial effects of this structure are: the portion of the top of the blade 2 where the blade 3 is installed maintains a straight plate structure, so that the straight blade 3 can be tightly and firmly installed on the blade 2 through the bolt 1; the top of the blade 2 is perpendicular to the tangential direction of the impeller 8, so that the blade 3 can normally support the wood chip on the knife ring 9 for planing.

[0027] The beneficial effects of the present invention are as follows: it provides a ring-type chipper impeller whose impellers are composed of arc plates and straight plates, which solves the problems of poor aerodynamic characteristics, low efficiency of centrifugal conveying of wood chips, easy wear of impellers, high energy consumption, etc. of the currently commonly used impellers with radial straight plate impeller structures, reduces noise, operating energy consumption and impeller wear, reduces the situation of wood chips being broken by impellers, and improves the efficiency of the impeller in feeding wood chips.

[0028] It should also be noted that, in this article, the term "comprise" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in the present invention, but will conform to the widest scope consistent with the principles and novel features disclosed in the present invention.

Claims

1. An impeller of a ring flaker, comprising a wheel shell, blades (3) and bolts (1), wherein the wheel shell is welded by a wheel ring (4), a wheel plate (5), a shaft sleeve (6), a cone liner (7) and a plurality of blades (2), wherein the blades (2) are evenly arranged along the circumference of the wheel ring, and the two sides of the blades (2) are respectively welded to the wheel ring (4) and the wheel plate (5), and characterized in that: The top end of the blade (2) is perpendicular to the tangential direction of the impeller (8). The axial projection of any blade (2) on the impeller (8) is in a curved shape. The blade is composed of a circular arc plate and a straight plate. The straight plate portion of the blade (2) is arranged radially and radially, and has an angle β with the tangential direction of the impeller (8). The blade (3) is installed. The inner side of the circular arc of the circular arc portion of the blade (2) follows the direction of rotation of the impeller (8). The axial projection radius of the circular arc portion on the impeller (8) is R. The end of the circular arc plate close to the knife ring (9) is tangent to the straight plate portion of the blade (2) on which the blade (3) is installed. The tangent of the tail end of the circular arc plate facing the axis of the impeller (8) has an angle α with the tangential direction of the impeller (8). The radius R of the circular arc plate satisfies the formula: H is the total height of the blade, h is the height of the straight plate portion of the blade on which the blade is mounted; the angle α satisfies 20°<α<45°, and the angle β=90°.

2. The impeller of a ring flaker according to claim 1, characterized in that: Angle α=36°, H=200mm, h=50mm, R=185.41mm.

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