CN213726839U - Sectional type pull rod for roller coal mill - Google Patents
Sectional type pull rod for roller coal mill Download PDFInfo
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- CN213726839U CN213726839U CN202022442829.0U CN202022442829U CN213726839U CN 213726839 U CN213726839 U CN 213726839U CN 202022442829 U CN202022442829 U CN 202022442829U CN 213726839 U CN213726839 U CN 213726839U
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- pull rod
- coal mill
- limit switch
- sectional type
- displacement sensor
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Abstract
The utility model relates to the technical field of coal mill pull rods, in particular to a sectional type pull rod for a roller coal mill, which comprises a pull rod sealing bin, a pull rod and a pull rod hydraulic cylinder; the pull rod sealing bin is in sliding fit with the top of the pull rod, and the output end of the pull rod hydraulic cylinder is connected with the bottom of the pull rod; the pull rod is composed of a plurality of sections which are detachably connected with each other; the upper part of the uppermost section of the pull rod is provided with a pull rod high-limit switch touch plate, the lower side of the pull rod high-limit switch touch plate is fixedly provided with a pull rod displacement sensor emitter, and the lower part of the lowermost section of the pull rod is provided with a pull rod displacement sensor reflecting plate corresponding to the pull rod displacement sensor emitter. The pull rod of the coal mill is divided into multiple sections, only one section of the pull rod needs to be replaced when the pull rod is broken, cost and maintenance time are saved, the displacement detector is additionally arranged on the pull rod, breakage of any position of the pull rod can be found as soon as possible, and serious damage to the coal mill caused by delay in finding is avoided.
Description
Technical Field
The utility model relates to a coal pulverizer pull rod technical field especially relates to a sectional type pull rod for roller coal pulverizer.
Background
Coal mills are one of the main equipments in power plants, and provide coal powder to boilers continuously and continuously to provide fuels required for combustion of the boilers. The roller coal mill belongs to a medium-speed coal mill, and has the advantages of large diameter of a grinding roller, small rolling resistance, good output characteristic, good uniformity of pulverized coal and good stability.
The pull rod of the coal mill is an important mechanism for providing loading force for the grinding roller, the loading force directly influences the capability of the coal mill for grinding pulverized coal, and the balance of the loading force applied by the pull rod has great influence on the vibration of the coal mill, the stable operation of the grinding roller and the like. At present, the pull rod of the domestic roller coal mill adopts a plurality of single-rod pull rods, because the grinding disc has uneven coal bed, different abrasion degrees of the grinding rollers and larger loading force and shearing stress borne by the pull rod, the breakage often occurs, the grinding rollers of the coal mill are further damaged, the grinding disc cracks sometimes occur, the pull rod needs to be replaced in a whole piece after being broken, and the replacement cost is higher.
Meanwhile, after the pull rod is broken, the existing limit switch is not easy to trigger, and the existing limit switch is only detected and found by polling on the spot, so that the problems are not easy to find in time, and the coal mill is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a sectional type pull rod for a roller coal mill.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a sectional type pull rod for a roller coal mill comprises a pull rod sealing bin, a pull rod and a pull rod hydraulic cylinder; the pull rod sealing bin is in sliding fit with the top of the pull rod, and the output end of the pull rod hydraulic cylinder is connected with the bottom of the pull rod; the pull rod is composed of a plurality of sections which are detachably connected with each other; the upper part of the uppermost section of the pull rod is provided with a pull rod high-limit switch touch plate, the lower side of the pull rod high-limit switch touch plate is fixedly provided with a pull rod displacement sensor emitter, and the lower part of the lowermost section of the pull rod is provided with a pull rod displacement sensor reflection plate corresponding to the pull rod displacement sensor emitter.
Preferably, the coal pulverizer also comprises a pull rod high limit switch which is fixedly arranged on the coal pulverizer body and is positioned on the upper side of the contact plate of the pull rod high limit switch.
Preferably, the end part of each section of the pull rod is integrally provided with a sectional pull rod connecting flange, and each section of the pull rod is connected through the sectional pull rod connecting flange.
Preferably, the two segmented pull rod connecting flanges are fastened through segmented pull rod connecting bolts.
Preferably, a segmented pull rod reinforcing rib is fixedly arranged between the pull rod and the segmented pull rod connecting flange.
The utility model has the advantages that:
1. the pull rod of the coal mill is divided into multiple sections, and only one section of the pull rod needs to be replaced when the pull rod is broken, so that the cost and the maintenance time are saved.
2. The pull rod and the connecting flange are integrally cast, the connecting surface of the pull rod and the flange is reinforced by the reinforcing rib, the strength of the pull rod is enhanced, and the fracture possibility is greatly reduced.
3. The displacement detector is additionally arranged on the pull rod, is more sensitive than a limit switch, can discover the fracture of any position of the pull rod as soon as possible, and avoids serious damage to the coal mill caused by discovery delay.
Drawings
Fig. 1 is a schematic structural view of a sectional type pull rod for a roller coal mill provided by the present invention.
In the figure: the device comprises a 1-pull rod sealing bin, a 2-pull rod, a 21-pull rod high limit switch, a 22-pull rod high limit switch touch plate, a 23-pull rod displacement sensor emitter, a 24-pull rod displacement sensor reflecting plate, a 25-segmented pull rod reinforcing rib, a 26-segmented pull rod connecting bolt, a 27-segmented pull rod connecting flange and a 3-pull rod hydraulic cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1, a sectional type pull rod for a roller coal mill comprises a pull rod sealing bin 1, a pull rod 2, a pull rod hydraulic cylinder 3 and a pull rod high limit switch 21;
the pull rod sealing bin 1 is fixed with the coal mill body, the pull rod sealing bin 1 is in sliding fit with the top of the pull rod 2, and the output end of the pull rod hydraulic cylinder 3 is connected with the bottom of the pull rod 2;
the roller coal mill is generally provided with three grinding rollers, the grinding rollers are fixed on a tripod, a pull rod applies a loading force to the tripod so as to load an acting force on the grinding rollers, the pull rod 2 is connected with the tripod in the mill and applies a loading force to the grinding rollers, the interior of the mill is positive pressure, and a pull rod sealing bin 1 is a device for separating pulverized coal in the mill from the exterior of the mill and can prevent the pulverized coal from overflowing; the pull rod hydraulic cylinder 3 mainly provides supporting and loading force for the pull rod 2.
The pull rod 2 is composed of four sections, each section is detachably connected, when one section of the pull rod 2 is broken, only one section needs to be replaced, the broken pull rod is convenient to overhaul quickly, and cost is saved.
The pull rod high limit switch 21 is fixedly arranged on the coal mill body, is not connected with the pull rod 2, and is mainly used for reflecting the balance degree of a tripod in a mill, monitoring a roller lifting and the like, if a problem occurs in the coal mill or one of three pull rods is broken, the tripod is unbalanced, and the pull rod high limit switch 21 can act; when the roller is lifted, the pull rod high limit switch 21 is actuated after the roller is lifted to the right position.
A pull rod high-limit switch touch plate 22 is installed on the upper part of the uppermost section of the pull rod 2, the pull rod high-limit switch 21 is located on the upper side of the pull rod high-limit switch touch plate 22, a pull rod displacement sensor emitter 23 is fixedly installed on the lower side of the pull rod high-limit switch touch plate 22, and a pull rod displacement sensor reflection plate 24 corresponding to the pull rod displacement sensor emitter 23 is installed on the lower part of the lowermost section of the pull rod 2;
the pull rod high limit switch touch panel 22 is used for touching the pull rod high limit switch 21 along with the action of the pull rod 2, the pull rod displacement sensor emitter 23 emits a signal to the pull rod displacement sensor reflection plate 24 to detect the absolute distance, if the distance is increased, the breakage of the pull rod is illustrated, the alarm is immediately sent to the DCS, and the breakage of the pull rod is favorably and timely found.
The end part of each section of the pull rod 2 is integrally cast with a sectional pull rod connecting flange 27, each section of the pull rod 2 is connected through the sectional pull rod connecting flange 27, the two sectional pull rod connecting flanges 27 are fastened through sectional pull rod connecting bolts 26, and most of the broken pull rods are easy to occur on the joint surface of the pull rod 2 and the sectional pull rod connecting flanges 27, so that sectional pull rod reinforcing ribs 25 are welded between the pull rod 2 and the sectional pull rod connecting flanges 27, the influence of a tool withdrawal groove on strength is reduced, and the breakage of the pull rod 2 is avoided to the maximum extent.
When the grinding roller is required to be lifted, the pull rod high limit switch touch plate 22 touches the pull rod high limit switch 21, the roller lifting stops, and the grinding roller can be prevented from being excessively lifted.
When one section of the pull rod 2 is broken, the pull rod high limit switch 21 is not triggered, the distance detected by the pull rod displacement sensor emitter 23 changes, a signal is sent to the DCS, grinding is stopped in time after personnel confirm, and the internal damage and expansion of the coal mill can be avoided. When the pull rod 2 is replaced, the broken section of the pull rod 2 is replaced by loosening the sectional pull rod connecting bolts 26 above and below the broken part.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. A sectional type pull rod for a roller coal mill is characterized by comprising a pull rod sealing bin (1), a pull rod (2) and a pull rod hydraulic cylinder (3);
the pull rod sealing bin (1) is in sliding fit with the top of the pull rod (2), and the output end of the pull rod hydraulic cylinder (3) is connected with the bottom of the pull rod (2);
the pull rod (2) is composed of a plurality of sections which are detachably connected with each other;
the upper portion of the uppermost section of the pull rod (2) is provided with a pull rod high limit switch touch plate (22), the lower side of the pull rod high limit switch touch plate (22) is fixedly provided with a pull rod displacement sensor emitter (23), and the lower portion of the lowermost section of the pull rod (2) is provided with a pull rod displacement sensor reflection plate (24) corresponding to the pull rod displacement sensor emitter (23).
2. The sectional type pull rod for the roller coal mill according to claim 1, further comprising a pull rod high limit switch (21) fixedly installed on the coal mill body and located on the upper side of the pull rod high limit switch touch plate (22).
3. The sectional type pull rod for the roller coal mill is characterized in that the end part of each section of the pull rod (2) is integrally provided with a sectional type pull rod connecting flange (27), and each section of the pull rod (2) is connected through the sectional type pull rod connecting flange (27).
4. The sectional tie rod for a roller mill according to claim 3, wherein two sectional tie rod connecting flanges (27) are fastened by a sectional tie rod connecting bolt (26).
5. The sectional type pull rod for the roller coal mill according to claim 3, wherein a sectional type pull rod reinforcing rib (25) is fixedly arranged between the pull rod (2) and the sectional type pull rod connecting flange (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022442829.0U CN213726839U (en) | 2020-10-28 | 2020-10-28 | Sectional type pull rod for roller coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022442829.0U CN213726839U (en) | 2020-10-28 | 2020-10-28 | Sectional type pull rod for roller coal mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213726839U true CN213726839U (en) | 2021-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022442829.0U Active CN213726839U (en) | 2020-10-28 | 2020-10-28 | Sectional type pull rod for roller coal mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213726839U (en) |
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2020
- 2020-10-28 CN CN202022442829.0U patent/CN213726839U/en active Active
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