Frame body limiting device in medium-speed coal mill

Abstract

The utility model discloses a limiting device for a middle frame body of a medium-speed coal mill, which relates to the technical field of pulverizing and crushing equipment, and comprises a support frame and a limiting plate, and the support frame is welded on the middle frame body; the limiting plate is arranged on the supporting frame; a plurality of superposed base plates are arranged on the support frame, the plurality of superposed base plates are arranged on the support frame through limiting plates, and the plurality of superposed base plates are arranged between the grinding roller and the grinding bowl lining plate. According to the utility model, the base plate is pulled and reduced so as to ensure that an enough gap is formed between the grinding roller and the grinding bowl lining plate. The running contact abrasion and vibration of the coal mill can be effectively improved, and the running stability of the coal mill is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverizing and crushing equipment, in particular to a middle frame limiting device for a medium-speed coal mill. Background Art

[0002] Coal mill is an ideal large-scale grinding equipment. It is a machine that breaks coal blocks and grinds them into coal powder. It is an important auxiliary equipment of pulverized coal furnace and is currently a more commonly used coal grinding equipment in thermal power plants. Its main function is to send the raw coal in the coal hopper of the machine to the coal mill to be ground into coal powder, and then blow the coal powder into the powder exhaust fan driven by hot air through a conveyor belt, and then enter the furnace of the boiler for combustion.

[0003] Medium-speed coal mills are mainly used in thermal power plants, chemical plants or steel plants to grind raw coal into coal powder with a certain fineness requirement, complete the coal powder drying process and transport the coal powder to boilers and other equipment.

[0004] In the frame of conventional medium-speed coal mills, there is a certain rigid contact between the grinding roller and the grinding bowl liner when grinding coal during operation, especially during the initial ignition blowpipe operation, which causes the coal mill to vibrate violently and accelerates the wear of the grinding roller and the grinding bowl liner.

[0005] Therefore, those skilled in the art provide a medium-speed coal mill middle frame limiting device to solve the problems raised in the above background technology. Utility Model Content

[0006] The utility model provides a middle frame limiting device for a medium-speed coal mill which overcomes the above-mentioned shortcomings in the operation of the existing coal mill.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The utility model discloses a middle frame limiting device for a medium-speed coal mill, comprising:

[0009] A support frame, the support frame is welded to the middle frame body;

[0010] A limit plate, wherein the limit plate is arranged on the support frame;

[0011] A plurality of stacked pads are arranged on the support frame, the plurality of stacked pads are arranged on the support frame through a limiting plate, and the plurality of stacked pads are arranged between the grinding roller and the grinding bowl liner.

[0012] Furthermore, the thickness of the pad is 6-20 mm.

[0013] In the above technical scheme, the utility model provides a medium-speed coal mill middle frame limit device, which has the following beneficial effects: when wear occurs between the grinding roller and the grinding bowl liner, the pad is reduced to ensure that there is enough clearance between the grinding roller and the grinding bowl liner. It can effectively improve the running contact wear and vibration of the coal mill and improve the running stability of the coal mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 A schematic diagram of the structure of a middle frame limit device for a medium-speed coal mill provided by an embodiment of the utility model;

[0016] Figure 2 A reference diagram of the use status of a middle frame limiting device of a medium-speed coal mill provided in an embodiment of the utility model.

[0017] Description of reference numerals:

[0018] 1. Support frame; 2. Limit plate; 3. Pad plate; 4. Pressurizer; 5. Pull rod; 6. Grinding roller; 7. Grinding bowl lining. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] See also Figure 1-2 As shown;

[0021] The utility model embodiment of the present invention is a medium-speed coal mill middle frame limiting device, comprising:

[0022] Support frame 1, the support frame 1 is welded in the guide groove of the middle frame pull rod;

[0023] A limit plate 2, wherein the limit plate 2 is arranged on the support frame 1;

[0024] A plurality of stacked pads 3 are arranged on the support frame 1, and the plurality of stacked pads 3 are placed on the support frame 1 through a limit plate 2. When the grinding roller 6 connected to the pressure booster 4 applies a downward force through the pull rod 5 to make the grinding roller 6 and the grinding bowl liner 7 perform coal grinding operation, the limit device of the present application welded in the pull rod guide groove can limit the height of the pressure booster, that is, adjust the height between the grinding roller 6 and the grinding bowl liner 7 by reducing the pad 3, so as to achieve excessive rigid contact between the grinding roller 6 and the grinding bowl liner 7. The top ends of the loader 4 and the pull rod 5 are both arranged on the loading frame pull rod, and the edge position of the loading frame pull rod falls on the uppermost pad 3. The thickness of the pad 3 is 6-20mm. As the grinding roller 6 and the grinding bowl liner 7 wear, the number of pads 3 can be reduced as needed to ensure the stable operation of the coal mill and the output requirements.

[0025] When wear occurs between the grinding roller and the grinding bowl liner, the backing plate 3 is reduced to ensure that there is enough clearance between the grinding roller 7 and the grinding bowl liner 8. This can effectively improve the contact wear and vibration of the coal mill and improve the operating stability of the coal mill.

[0026] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A medium-speed coal mill middle frame limiting device, characterized in that: include: A support frame (1), wherein the support frame (1) is welded to the middle frame body; A limiting plate (2), wherein the limiting plate (2) is arranged on the supporting frame (1); A plurality of stacked pads (3) are arranged on the support frame (1); the plurality of stacked pads (3) are arranged on the support frame (1) via a limiting plate (2), and the plurality of stacked pads (3) are arranged between the grinding roller (6) and the grinding bowl liner (7).

2. A medium-speed coal mill middle frame limiting device according to claim 1, characterized in that: The thickness of the pad (3) is 6-20 mm.

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