Wheel type structure and coal mill

Abstract

The wheel type structure comprises a wheel type grinding roller device and an arc-shaped grinding disc device, and the arc radius r of the outer circumference of a rolling wheel of the wheel type grinding roller device is smaller than the arc radius R of an arc-shaped ring groove of the arc-shaped grinding disc device. A grinding area is formed between a roller of the wheel type grinding roller device and an arc-shaped ring groove of the arc-shaped grinding disc device, and the inner side gap of the grinding area is larger than the outer side gap of the grinding area. The front section of the grinding area, namely the inner side of the grinding area, is used for crushing large raw coal materials, and the rear section of the grinding area, namely the outer side of the grinding area, is used for grinding finished product pulverized coal. By means of the specially-formed grinding area, raw coal is not prone to sliding after entering the grinding area, the raw coal is fully ground from inside to outside and from coarse to fine, the area of the grinding area is increased through matching of the arc-shaped arc faces under the same diameter structure, the grinding and crushing capacity and efficiency are improved, and therefore the adaptive capacity of HP and RP coal mills to inferior coal is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coal mill technical field especially relates to a wheel type structure and coal mill. BACKGROUND

[0002] The existing HP, RP coal mill bowl type cooperation structure as shown in Figure 1 And Figure 2 The conical roller device 1 is located above the bowl type grinding disc device 2, and the conical roller device 1 and the bowl type grinding disc device 2 cooperate to constitute the grinding area of the HP, RP coal mill, and there is a 4-5mm gap between the roller device and the grinding disc device, and the theoretical grinding contact point of the roller device and the grinding disc device is a straight line segment, and the raw coal is crushed and ground in the grinding area. The bowl type grinding disc device 2 is composed of a grinding bowl 201, a flat lining plate 202, an extension ring 203 and a clamping ring 204. The upper surface of the grinding bowl 201 is a conical surface, the flat lining plate 202 is placed on the grinding bowl 201, and the plurality of flat lining plates 202 are arranged in a straight disc shape according to the shape of the grinding bowl 201. The clamping ring 204 is installed on the inner circular ring of the grinding bowl 201, and the extension ring 203 is installed on the outer circular ring of the grinding bowl 201. The plurality of flat lining plates 202 arranged in a straight disc shape and the outer conical surface of the conical roller sleeve 102 constitute the grinding area.

[0003] The defects of the above structure are:

[0004] 1. When the raw coal is ground, it fills the gap between the flat lining plate 202 and the conical roller sleeve 102. Since the gap between the flat lining plate 202 and the conical roller sleeve 102 is similar to a parallel gap, the crushing pressure of the raw coal under the gap is close to equal, which leads to insufficient grinding of the raw coal and low crushing capacity.

[0005] 2. The flat lining plate 202 and the conical roller sleeve 102 are both inclined surfaces, and the grinding contact formed by the two is linear contact, which leads to small grinding area and low grinding capacity and efficiency, and low adaptability to poor coal. INVENTION CONTENTS

[0006] The utility model aims at providing a wheel type structure and coal mill, and aims at improving the grinding and crushing capacity of the HP, RP coal mill, making the raw coal grinding more sufficient, and improving the adaptability of the HP, RP coal mill to poor coal.

[0007] To achieve the above object, the utility model provides a wheel type structure, which comprises a wheel type roller device and an arc-shaped grinding disc device, the outer circumferential arc radius r of the roller of the wheel type roller device is less than the arc-shaped ring groove arc radius R of the arc-shaped grinding disc device, a grinding area is formed between the roller of the wheel type roller device and the arc-shaped ring groove of the arc-shaped grinding disc device, and the inside gap of the grinding area is greater than the outside gap.

[0008] The roller includes a roller core and a wheel-type roller sleeve, with the wheel-type roller sleeve fixedly mounted on the roller core. The outer circumferential radius of the wheel-type roller sleeve is r.

[0009] The thickness 'a' of the outer side of the wheel-type roller sleeve is not less than the thickness 'b' of the inner side.

[0010] The arc-shaped grinding disc device includes an arc-shaped liner plate, which is an integral ring structure or a ring structure composed of multiple pieces spliced ​​together, and the upper side of the arc-shaped liner plate has the arc-shaped annular groove.

[0011] The arc-shaped grinding disc device also includes a grinding bowl, and an arc-shaped liner is installed on the grinding bowl.

[0012] The arc-shaped grinding disc device also includes a fixing ring and a clamping ring. The fixing ring is installed on the outer circumference of the grinding bowl, and the clamping ring is installed on the inner circumference of the grinding bowl. The outer circumference of the arc-shaped liner contacts and is positioned with the fixing ring, and the inner circumference of the arc-shaped liner contacts and is clamped and fixed with the clamping ring.

[0013] The ratio of the outer circumferential radius r of the roller to the arc radius R of the arc groove is 1:1.05 to 1:1.35.

[0014] A wheel-type coal mill adopts the aforementioned wheel structure, wherein at least one of the wheel-type grinding roller devices is suspended inside the coal mill housing and located above the arc-shaped grinding disc device, which is mounted on a rotating device inside the coal mill housing.

[0015] Compared with the prior art, this utility model has the following technical effects:

[0016] 1. The grinding profile formed by the arc-shaped liner and the wheel-type roller sleeve consists of two arc surfaces of unequal sizes, with the radius r of the wheel-type roller sleeve being smaller than the radius R of the arc-shaped liner. The larger gap at the front of the wheel-type roller sleeve and the arc-shaped liner allows raw coal fed from the center to more easily enter the grinding zone formed by the wheel-type roller sleeve and the arc-shaped liner. The gap gradually decreases at the rear, subjecting the raw coal to greater crushing pressure. The front section of the grinding zone, i.e., the inner side, contains the more coarsely crushed raw coal, while the rear section, i.e., the outer side, produces the finished coal powder. This specifically formed grinding zone prevents the raw coal from slipping after entering the grinding zone, ensuring thorough grinding from the inside out and from coarse to fine. Under the same diameter structure, the arc-shaped surface combination increases the grinding zone area, improving grinding crushing capacity and efficiency, thus enhancing the adaptability of HP and RP coal mills to low-quality coal.

[0017] 2. The grinding line formed by the arc-shaped lining plate and the wheel type roller sleeve of the mill device is a circular arc cooperating with an arc surface. In the same diameter structure, the grinding area is larger than that of the inclined surface line of the original HP and RP coal mills, the grinding and crushing capacity and efficiency are improved, and the adaptability of the HP and RP coal mills to poor quality coal is increased. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced.

[0019] Figure 1 is a schematic view of the bowl type structure of the prior art HP and RP coal mills.

[0020] Figure 2 is a schematic view of the bowl type mill device and the conical mill roller device cooperating structure of the prior art HP and RP coal mills.

[0021] Figure 3 is a schematic view of the improved HP and RP coal mill structure of the present application.

[0022] Figure 4 is a schematic view of the improved HP and RP wheel type mill roller device and arc-shaped mill device cooperating structure of the present application.

[0023] Figure 5 is a sectional view of the asymmetric wheel type roller sleeve of the present application.

[0024] Reference signs:

[0025] The conical mill roller device 1 includes a roller core 101 and a conical roller sleeve 102.

[0026] The bowl type mill device 2 includes a mill bowl 201, a flat lining plate 202, an extension ring 203, and a clamping ring 204.

[0027] The wheel type mill roller 3 includes a wheel type roller sleeve 302.

[0028] The arc-shaped mill device 4 includes an arc-shaped lining plate 402, a fixing ring 403, and a pressing ring 404. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0030] Embodiment 1:

[0031] Referring to Figure 3 , 4A wheel structure comprises a wheel type grinding roller device 3 and an arc type grinding disc device 4, the roller is rotatably installed on a wheel shaft through a bearing, the outer circumferential arc radius r of the roller of the wheel type grinding roller device 3 is smaller than the arc radius R of the arc type ring groove of the arc type grinding disc device 4, and a grinding area is formed between the roller of the wheel type grinding roller device 3 and the arc type ring groove of the arc type grinding disc device 4, and the inner side gap of the grinding area is greater than the outer side gap.

[0032] In the grinding area formed by the wheel type grinding roller device 3 and the arc type grinding disc device 4, because the outer circumferential arc radius r of the roller of the wheel type grinding roller device 3 is smaller than the arc radius R of the arc type ring groove of the arc type grinding disc device 4, the space in the front section of the grinding area formed between the two is large, so that the raw coal discharged from the center can easily enter the grinding area. Figure 4 The matching gap between the rear section of the wheel type roller sleeve and the arc type lining plate gradually decreases, and the raw coal bears a greater breaking pressure. In the front section of the grinding area, that is, the inner side of the grinding area, the raw coal material with a large crushing degree is crushed, and in the rear section of the grinding area, that is, the outer side of the grinding area, the finished coal powder is ground. The specially formed grinding area makes it difficult for the raw coal to slide after entering the grinding area, and the raw coal is fully ground from the inside to the outside and from coarse to fine. The arc surface matching under the same diameter structure increases the area of the grinding area, improves the grinding and crushing capacity and efficiency, and therefore improves the adaptability of the HP and RP coal mills to poor quality coal.

[0033] In one of the schemes, the roller adopts an integrated structure.

[0034] In another scheme, referring to Figure 4 The roller comprises a roller core 101 and a wheel type roller sleeve 302, the wheel type roller sleeve 302 is fixedly sleeved on the roller core 101, and the outer circumferential arc radius of the wheel type roller sleeve 302 is r. When the wheel type roller sleeve 302 is worn, only the wheel type roller sleeve 302 needs to be replaced, and the entire roller does not need to be replaced.

[0035] Further, referring to Figure 5 The thickness a of the outer side of the wheel type roller sleeve 302 is not less than the thickness b of the inner side. When the shape of the outer working surface of the wheel type roller sleeve 302 is an arc, the structure is left-right asymmetric, and a>b, and when the structure is left-right symmetric, a=b.

[0036] In the embodiment, referring to Figure 4 The arc type grinding disc device 4 comprises an arc type lining plate 402, the arc type lining plate 402 is an integral annular structure or a ring-shaped structure formed by splicing multiple pieces, and the arc type lining plate 402 has the arc type ring groove on the upper side.

[0037] Further, the arc type grinding disc device 4 further comprises a grinding bowl 201, and the arc type lining plate 402 is installed on the grinding bowl 201.

[0038] Further, the arc-shaped grinding disc device 4 further comprises a fixing ring 403 and a pressing ring 404, the fixing ring 403 is installed on the outer ring of the grinding bowl 201, the pressing ring 404 is installed on the inner ring of the grinding bowl 201, the outer circle side of the arc-shaped lining plate 402 is in contact with and positioned by the fixing ring 403, and the inner circle side of the arc-shaped lining plate 402 is in contact with and pressed and fixed by the pressing ring 404.

[0039] Specifically, the fixing ring 403 can be fixedly installed on the grinding bowl 201 by bolts, for example, the bolts are inserted into the fixing ring 403 from top to bottom and then are fixedly connected with the grinding bowl 201 through thread cooperation.

[0040] In the preferred scheme, the ratio of the outer circle arc radius r of the roller to the arc-shaped ring groove arc radius R is 1:1.05-1:1.35.

[0041] Embodiment 2:

[0042] A wheel type coal mill adopts the wheel type structure, at least one wheel type grinding roller device 3 is suspendedly installed in the coal mill shell and located above the arc-shaped grinding disc device 4, and the arc-shaped grinding disc device 4 is installed on the rotating device in the coal mill shell.

[0043] The installation method or principle of the utility model:

[0044] For the improvement of the HP and RP coal mill grinding roller device and grinding disc device, the conical roller sleeve 102 of the conical grinding roller device 1 is improved into a wheel type roller sleeve 302, so that the conical grinding roller device 1 is improved into a wheel type grinding roller device 3, and the outer circle working surface of the wheel type roller sleeve 302 is arc-shaped. The flat lining plate 202 of the bowl type grinding disc device 2 is improved into the arc-shaped lining plate 402 in the arc-shaped grinding disc device 4, the lower mounting surface of the arc-shaped lining plate 402 is still flat, and the upper working surface of the arc-shaped lining plate 402 is arc-shaped. The ratio of the arc radius r of the outer circle working surface of the wheel type roller sleeve 302 to the arc radius R of the upper working surface of the arc-shaped lining plate 402 is 1:1.05-1:1.35, and the arc shape of the outer circle working surface of the wheel type roller sleeve 302 is left-right asymmetric or left-right symmetric.

[0045] The wheel type grinding roller device 3 is located above the arc-shaped grinding disc device 4, and the wheel type grinding roller device 3 and the arc-shaped grinding disc device 4 constitute the grinding area of the HP and RP coal mill.

[0046] The assembling mode of the wheel roller sleeve 302 of the wheel type grinding roller device 3 and the roller core 101 still adopts the interference fit assembling mode, and the wheel roller sleeve 302 needs to be expanded by heating before being installed.

[0047] The fixed ring 403 is fixedly installed on the grinding bowl 201 by bolts, and the arc-shaped lining plate 402 and the fixed ring 403 can be positioned by concave-convex structures to prevent the arc-shaped lining plate 402 from moving relative to the grinding bowl 201. The pressing ring 404 is fixedly installed on the rotating device in the coal mill shell by bolts. Since the contact surface of the pressing ring 404 and the arc-shaped lining plate 402 is an inclined surface, and the pressing ring 404 is wide at the top and narrow at the bottom, referring to Figure 4 When the bolts on the pressing ring 404 are tightened downward, the pressing ring 404 moves downward to press and fix the arc-shaped lining plate 402.

Claims

1. A wheel structure comprising a wheel mill device (3) and an arc mill device (4), characterized in that: The outer circumferential arc radius r of the roller of the wheel type grinding roller device (3) is smaller than the arc radius R of the arc shaped ring groove of the arc shaped grinding disc device (4), and a grinding area is formed between the roller of the wheel type grinding roller device (3) and the arc shaped ring groove of the arc shaped grinding disc device (4), and the inner side gap of the grinding area is larger than the outer side gap.

2. A wheeled structure according to claim 1, wherein: The roller comprises a roller core (101) and a wheel type roller sleeve (302), and the wheel type roller sleeve (302) is fixedly sleeved on the roller core (101), and the outer circumferential arc radius of the wheel type roller sleeve (302) is r.

3. A wheeled structure according to claim 2, wherein: The thickness a of the outer side of the wheel type roller sleeve (302) is not less than the thickness b of the inner side.

4. A wheeled structure according to claim 1, wherein: The arc shaped grinding disc device (4) comprises an arc shaped lining plate (402), and the arc shaped lining plate (402) is an integral annular structure or a ring structure spliced by multiple pieces, and the upper side of the arc shaped lining plate (402) is provided with the arc shaped ring groove.

5. A wheeled structure according to claim 4, wherein: The arc shaped grinding disc device (4) further comprises a grinding bowl (201), and the arc shaped lining plate (402) is installed on the grinding bowl (201).

6. A wheeled structure according to claim 5, wherein: The arc shaped grinding disc device (4) further comprises a fixing ring (403) and a pressing ring (404), the fixing ring (403) is installed on the outer circumferential ring of the grinding bowl (201), the pressing ring (404) is installed on the inner side ring of the grinding bowl (201), the outer circular side of the arc shaped lining plate (402) is in contact with and positioned by the fixing ring (403), and the inner circular side of the arc shaped lining plate (402) is in contact with and pressed and fixed by the pressing ring (404).

7. A wheeled structure according to claim 1, wherein: The ratio of the outer circumferential arc radius r of the roller to the arc radius R of the arc shaped ring groove is 1:1.05-1:1.

35.

8. A wheel-type coal mill characterized by: The wheel type structure of any one of claims 1-7 is adopted, at least one wheel type grinding roller device (3) is suspended and installed in the shell of the coal mill and located above the arc shaped grinding disc device (4), and the arc shaped grinding disc device (4) is installed on the rotating device in the shell of the coal mill.

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