CN108515258B - Repairing method for grinding roller of cement roller press - Google Patents
Repairing method for grinding roller of cement roller press Download PDFInfo
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- CN108515258B CN108515258B CN201810244701.8A CN201810244701A CN108515258B CN 108515258 B CN108515258 B CN 108515258B CN 201810244701 A CN201810244701 A CN 201810244701A CN 108515258 B CN108515258 B CN 108515258B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Plasma Technology (AREA)
Abstract
The invention provides a method for repairing a grinding roller of a cement roller press, which can ensure that the occurrence of arc breakage can be reduced to the maximum extent in the air gouging process of a plasma air gouging machine through the operation parameters set by the method for repairing the grinding roller of the roller press, and improve the working efficiency; meanwhile, the generated noise, smoke and dust are less, the field working environment of operators is optimized, and the atmospheric pollution is reduced. Meanwhile, the distance detection device and the arc striking module are added in the method for repairing the grinding roller of the roller press, waste generated when the plasma gas planer meets a pit can be reduced, the pit of the grinding roller easily enables the plasma gas planer to break an arc, the distance detection device is matched with the arc striking module, the plasma gas planer can timely recover to work after the arc is broken, and the process and the quality of the gas planer are guaranteed.
Description
Technical Field
The invention relates to the technical field of grinding equipment, in particular to a grinding roller repairing method of a cement roller press.
Background
The roller press is designed according to the grinding principle of a material bed, and is mainly characterized in that: high pressure, full speed, full material and material bed crushing. The roller press consists of two extrusion rollers which rotate oppositely and synchronously, one is a fixed roller, and the other is a movable roller. The material is fed from the upper part of the two rollers, is continuously brought into the space between the rollers by the extrusion rollers, and becomes a compact material cake after being subjected to the action of high pressure of 100-150 MPa, and is discharged from the lower part of the machine. The discharged cake, in addition to containing a proportion of finished fines. A large number of cracks are generated in the non-finished product particles, so that the grindability of the materials is improved, and the grinding energy consumption can be greatly reduced in the further grinding process.
The requirements of the roller press on the size and uniformity of the granularity of the materials are strict, more than 95 percent of the particles are generally less than 3 percent of the roller diameter, and individual large materials are not more than 5 percent of the roller diameter. When the ratio of the material granularity to the roller diameter is within 3.5 percent in the using process, the roller press operates stably; if the feeding granularity is doubled, the material bed is not uniform, the material is not easy to be meshed between two rollers, and the vibration value of the roller press is increased by 5 times. The particle size distribution of the roller surface along the length direction of the roller press is required not to be greatly different, otherwise, the roller press is easy to cause the phenomenon of roller deviation, and the system operation is influenced. The roller press has good effect of extruding materials with brittleness and more gaps. However, in order to reduce the production cost and utilize industrial wastes, the addition amount of the mixed material is more and more, and some proportion reaches 50%. The added mixed materials mainly comprise coal gangue, black stone, steel slag, water granulated slag and the like, and the mixed materials are very hard and have poor grindability, so that the abrasion speed of the roller surface of the roller press is accelerated. After the roller is used for a period of time, the roller surface can be subjected to pits, adhesion, abrasion and the like. Because the cost of grinding roller is higher, the cost of purchasing again is high, consequently when the grinding roller damages to a certain degree, can restore the grinding roller.
In the prior art, the grinding roller is usually repaired by removing a fatigue layer of the grinding roller through a carbon arc gouging and then restoring the grinding roller through a surfacing technology. Carbon arc gouging is a surface processing method which uses a carbon rod or a graphite rod as an electrode, generates high-temperature electric arc between the carbon rod or the graphite rod and a workpiece, melts metal and blows off the molten metal by compressed air. The carbon arc gouging produces loud noise, smog, still accompanied by dust pollution. Before operation, the roller surface needs to be polished clean, otherwise, a loop formed by the electrode and the workpiece is disconnected, and arc breakage occurs. Carbon arc gouging also tends to produce carburization. Meanwhile, the carbon arc gouging machine consumes more carbon rods, has higher cost and is not beneficial to saving resources. If the plasma gouging machine is used, the plasma gouging machine is greatly influenced by gas flow, electric arc length, current magnitude and cutting speed in the process of gouging the cement roller by the plasma gouging machine, so that the problems of arc breakage and energy waste are easily caused.
Disclosure of Invention
In view of the above, there is a need for an environment-friendly, convenient, cost-effective and resource-saving repairing method for a grinding roller of a roller press.
The repairing method of the grinding roller of the roller press comprises the following steps:
step S001, horizontally erecting two ends of the grinding roller on a rotating device so as to enable the rotating device to drive the grinding roller to rotate;
step S002, aligning a nozzle of a plasma gas planer arranged on the first moving mechanism to the grinding roller, wherein the nozzle of the plasma gas planer is positioned at the first end of the grinding roller and is arranged downwards, the included angle between the spraying direction of the nozzle and the vertical surface direction of the grinding roller is 30-45 degrees, and the included angle between the spraying direction of the nozzle and the cross section of the grinding roller is 30-45 degrees;
step S003, a grinding roller is rotated, the rotation speed of the grinding roller is 500 mm per minute, a plasma gas planer is started to carry out air gouging on the grinding roller, the arc length of the plasma gas planer is controlled to be 20-50 mm, the air gouging depth is 15-20 mm, the air gouging width is 15-20 mm, after the grinding roller rotates for one circle, a first moving mechanism drives the plasma gas planer to advance for 15-20 mm along the cross section of the grinding roller, and air gouging is continuously carried out on the grinding roller, the plasma gas planer is provided with a distance detection device, and when the distance detection device detects that the distance between the surface of the grinding roller and a nozzle of the plasma gas planer is larger than a set distance, the plasma gas planer stops air gouging on the grinding roller; when the distance detection device detects that the distance between the surface of the grinding roller and the nozzle of the plasma gas planer is smaller than or equal to a set distance, the plasma gas planer performs gas planing on the grinding roller, the plasma gas planer is further provided with an arc striking module so that the plasma gas planer can quickly generate electric arcs, and when the plasma gas planer stops performing gas planing on the grinding roller, the arc striking module continues to work; when the plasma gas planer needs to be restarted to carry out gas planing on the grinding roller, the arc striking module enables the electrode of the plasma gas planer and the surface of the grinding roller to generate high-temperature electric arcs, so that the grinding roller is subjected to gas planing;
step S004, when the plasma gas planer moves to the second end of the grinding roller, the control device adjusts the angle of the plasma gas planer, the angle between the plasma gas planer and the vertical surface of the grinding roller is made to be 30-45 degrees, meanwhile, the control device adjusts the direction of the first moving mechanism, the moving mechanism moves reversely until the plasma gas planer reaches the first end of the grinding roller, the steps are repeated, the fatigue layer of the grinding roller is completely planed to expose the parent material layer, and no crack exists on the surface of the grinding roller after flaw detection;
step S005, the plasma gas planer is closed, the second moving mechanism, the plasma welding machine and the water spraying device are arranged above the grinding roller, a nozzle of the plasma welding machine faces downwards to be opposite to the grinding roller, the plasma welding machine and the water spraying device are arranged on the second moving mechanism, so that the second moving mechanism drives the plasma welding machine and the water spraying device to move along the cross section of the grinding roller, the water spraying device is arranged behind the plasma welding machine, water is sprayed and cooled after the plasma welding machine performs surfacing, cracks are generated on the surface of a welding layer, the welding layer is prevented from falling off, and meanwhile, the internal stress of the welding layer is eliminated;
and step S006, preheating the grinding roller without the fatigue layer until the temperature of the grinding roller reaches more than 200 ℃, starting a plasma welding machine and a water spraying device, and surfacing the base material layer with the fatigue layer removed.
Has the advantages that: various operation parameters of the method for repairing the grinding roller of the roller press are optimal data which are repeatedly verified through a large number of tests. By setting the operating parameters, the plasma air gouging machine can be ensured to reduce the occurrence of arc breakage to the maximum extent in the air gouging process, and the working efficiency is improved; meanwhile, the generated noise, smoke and dust are less, the field working environment of operators is optimized, and the atmospheric pollution is reduced. Meanwhile, the distance detection device and the arc striking module are added in the method for repairing the grinding roller of the roller press, waste generated when the plasma gas planer meets a pit can be reduced, the pit of the grinding roller easily enables the plasma gas planer to break an arc, the distance detection device is matched with the arc striking module, the plasma gas planer can timely recover to work after the arc is broken, and the process and the quality of the gas planer are guaranteed.
Drawings
Fig. 1 is a circuit diagram of an arc striking module.
In the figure: arc ignition circuit 10, coil 101, nozzle 20, electrode 30, rectifier 40.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
The repairing method of the grinding roller of the roller press comprises the following steps:
step S001, horizontally erecting two ends of the grinding roller on a rotating device so as to enable the rotating device to drive the grinding roller to rotate;
step S002, aligning a nozzle of a plasma gas planer arranged on the first moving mechanism to the grinding roller, wherein the nozzle of the plasma gas planer is positioned at the first end of the grinding roller and is arranged downwards, the included angle between the spraying direction of the nozzle and the vertical surface direction of the grinding roller is 30-45 degrees, and the included angle between the spraying direction of the nozzle and the cross section of the grinding roller is 30-45 degrees;
the vertical plane direction in step S002 refers to the plane in which the axis of the grinding roller lies with a line perpendicular to the ground.
Step S003, a grinding roller is rotated, the rotation speed of the grinding roller is 500 mm per minute, a plasma gas planer is started to carry out air gouging on the grinding roller, the arc length of the plasma gas planer is controlled to be 20-50 mm, the air gouging depth is 15-20 mm, the air gouging width is 15-20 mm, after the grinding roller rotates for one circle, a first moving mechanism drives the plasma gas planer to advance for 15-20 mm along the cross section of the grinding roller, and air gouging is continuously carried out on the grinding roller, the plasma gas planer is provided with a distance detection device, and when the distance detection device detects that the distance between the surface of the grinding roller and a nozzle of the plasma gas planer is larger than a set distance, the plasma gas planer stops air gouging on the grinding roller; when the distance detection device detects that the distance between the surface of the grinding roller and the nozzle of the plasma gas planer is smaller than or equal to a set distance, the plasma gas planer performs gas planing on the grinding roller, the plasma gas planer is further provided with an arc striking module so that the plasma gas planer can quickly generate electric arcs, and when the plasma gas planer stops performing gas planing on the grinding roller, the arc striking module continues to work; when the plasma gas planer needs to be restarted to carry out gas planing on the grinding roller, the arc striking module enables the electrode of the plasma gas planer and the surface of the grinding roller to generate high-temperature electric arcs, so that the grinding roller is subjected to gas planing;
in a preferred embodiment, please refer to fig. 1, the arc striking module includes an arc striking circuit 10, the arc striking circuit forms a loop with a nozzle 20 and an electrode 30 of the plasma gas planer, after the arc striking circuit is powered on, a plasma arc is generated between the electrode 30 and the nozzle 20, and the difficulty of generating the arc between the surface of the cement roller and the electrode 30 is greatly reduced under the action of a high-temperature plasma airflow generated by the arc striking module, so that the plasma gas planer can quickly resume working, and the working efficiency of the plasma gas planer is not affected.
Step S004, when the plasma gas planer moves to the second end of the grinding roller, the control device adjusts the angle of the plasma gas planer, the angle between the plasma gas planer and the vertical surface of the grinding roller is made to be 30-45 degrees, meanwhile, the control device adjusts the direction of the first moving mechanism, the moving mechanism moves reversely until the plasma gas planer reaches the first end of the grinding roller, the steps are repeated, the fatigue layer of the grinding roller is completely planed to expose the parent material layer, and no crack exists on the surface of the grinding roller after flaw detection;
step S005, the plasma gas planer is closed, the second moving mechanism, the plasma welding machine and the water spraying device are arranged above the grinding roller, a nozzle of the plasma welding machine faces downwards to be opposite to the grinding roller, the plasma welding machine and the water spraying device are arranged on the second moving mechanism, so that the second moving mechanism drives the plasma welding machine and the water spraying device to move along the cross section of the grinding roller, the water spraying device is arranged behind the plasma welding machine, water is sprayed and cooled after the plasma welding machine performs surfacing, cracks are generated on the surface of a welding layer, the welding layer is prevented from falling off, and meanwhile, the internal stress of the welding layer is eliminated;
in a preferred embodiment, the water spraying device comprises a nozzle, a water pipe, a support frame, wherein the nozzle is positioned at the tail end of the water pipe, the water pipe is fixed on the support frame, the support frame is fixedly connected with a second moving mechanism, the second moving mechanism drives the support frame to move, the second moving mechanism comprises a second slide rail groove and a second slide block, the second slide block is connected with the second slide rail groove in a clamping manner, the second slide block can slide on the second slide rail groove, the support frame and a welding gun of the plasma welding machine are fixedly connected with the second slide block, the water spraying device is arranged behind a nozzle of the plasma welding machine, the distance between the nozzle of the water spraying device and the nozzle of the plasma welding machine is 100-150 mm, the water temperature of the water spraying device is 20-30 ℃, and the water spraying amount is 250-300 ml per minute. If the water temperature of the sprayed water is too low, the weld width during the overlaying process is insufficient, and the overlaying efficiency is reduced.
And step S006, preheating the grinding roller without the fatigue layer until the temperature of the grinding roller reaches more than 200 ℃, starting a plasma welding machine and a water spraying device, and surfacing the base material layer with the fatigue layer removed.
Various operation parameters of the method for repairing the grinding roller of the roller press are optimal data which are repeatedly verified through a large number of tests. By setting the operating parameters, the plasma air gouging machine can be ensured to reduce the occurrence of arc breakage to the maximum extent in the air gouging process, and the working efficiency is improved; meanwhile, the generated noise, smoke and dust are less, the field working environment of operators is optimized, and the atmospheric pollution is reduced. Meanwhile, the distance detection device and the arc striking module are added in the method for repairing the grinding roller of the roller press, waste generated when the plasma gas planer meets a pit can be reduced, the pit of the grinding roller easily enables the plasma gas planer to break an arc, the distance detection device is matched with the arc striking module, the plasma gas planer can timely recover to work after the arc is broken, and the process and the quality of the gas planer are guaranteed.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. The method for repairing the grinding roller of the cement roller press is characterized by comprising the following steps of: the method comprises the following steps:
step S001, horizontally erecting two ends of the grinding roller on a rotating device so as to enable the rotating device to drive the grinding roller to rotate;
step S002, aligning a nozzle of a plasma gas planer arranged on the first moving mechanism to the grinding roller, wherein the nozzle of the plasma gas planer is positioned at the first end of the grinding roller and is arranged downwards, the included angle between the spraying direction of the nozzle and the vertical surface direction of the grinding roller is 30-45 degrees, and the included angle between the spraying direction of the nozzle and the cross section of the grinding roller is 30-45 degrees;
step S003, a grinding roller is rotated, the rotation speed of the grinding roller is 500 mm per minute, a plasma gas planer is started to carry out air gouging on the grinding roller, the arc length of the plasma gas planer is controlled to be 20-50 mm, the air gouging depth is 15-20 mm, the air gouging width is 15-20 mm, after the grinding roller rotates for one circle, a first moving mechanism drives the plasma gas planer to advance for 15-20 mm along the cross section of the grinding roller, and air gouging is continuously carried out on the grinding roller, the plasma gas planer is provided with a distance detection device, and when the distance detection device detects that the distance between the surface of the grinding roller and a nozzle of the plasma gas planer is larger than a set distance, the plasma gas planer stops air gouging on the grinding roller; when the distance detection device detects that the distance between the surface of the grinding roller and the nozzle of the plasma gas planer is smaller than or equal to a set distance, the plasma gas planer performs gas planing on the grinding roller, the plasma gas planer is further provided with an arc striking module so that the plasma gas planer can quickly generate electric arcs, and when the plasma gas planer stops performing gas planing on the grinding roller, the arc striking module continues to work; when the plasma gas planer needs to be restarted to carry out gas planing on the grinding roller, the arc striking module enables the electrode of the plasma gas planer and the surface of the grinding roller to generate high-temperature electric arcs, so that the grinding roller is subjected to gas planing;
step S004, when the plasma gas planer moves to the second end of the grinding roller, the control device adjusts the angle of the plasma gas planer, the angle between the plasma gas planer and the vertical surface of the grinding roller is made to be 30-45 degrees, meanwhile, the control device adjusts the direction of the first moving mechanism, the moving mechanism moves reversely until the plasma gas planer reaches the first end of the grinding roller, the steps are repeated, the fatigue layer of the grinding roller is completely planed to expose the parent material layer, and no crack exists on the surface of the grinding roller after flaw detection;
step S005, the plasma gas planer is closed, the second moving mechanism, the plasma welding machine and the water spraying device are arranged above the grinding roller, a nozzle of the plasma welding machine faces downwards to be opposite to the grinding roller, the plasma welding machine and the water spraying device are arranged on the second moving mechanism, so that the second moving mechanism drives the plasma welding machine and the water spraying device to move along the cross section of the grinding roller, the water spraying device is arranged behind the plasma welding machine, water is sprayed and cooled after the plasma welding machine performs surfacing, cracks are generated on the surface of a welding layer, the welding layer is prevented from falling off, and meanwhile, the internal stress of the welding layer is eliminated;
and step S006, preheating the grinding roller without the fatigue layer until the temperature of the grinding roller reaches more than 200 ℃, starting a plasma welding machine and a water spraying device, and surfacing the base material layer with the fatigue layer removed.
2. The method for repairing a grinding roll of a cement roller press as set forth in claim 1, wherein: the arc striking module comprises an arc striking circuit, the arc striking circuit, a nozzle of the plasma gas planer and an electrode form a loop, after the arc striking module is electrified, a plasma arc is generated between the electrode and the nozzle, and the difficulty of generating the arc between the surface of the cement roller and the electrode is greatly reduced under the action of high-temperature plasma airflow generated by the arc striking module, so that the plasma gas planer can quickly recover to work, and the working efficiency of the plasma gas planer is not influenced.
3. The method for repairing a grinding roll of a cement roller press as set forth in claim 1, wherein: the distance between the spray head of the water spraying device and the nozzle of the plasma welding machine is 100-150 mm, the water temperature of the water spraying device is 20-30 ℃, and the water spraying amount is 250-300 milliliters per minute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810244701.8A CN108515258B (en) | 2018-03-23 | 2018-03-23 | Repairing method for grinding roller of cement roller press |
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| CN201810244701.8A CN108515258B (en) | 2018-03-23 | 2018-03-23 | Repairing method for grinding roller of cement roller press |
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| CN108515258B true CN108515258B (en) | 2020-06-26 |
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| CN109352223A (en) * | 2018-11-15 | 2019-02-19 | 安徽应流集团霍山铸造有限公司 | A kind of method that water cooling reduces repair welding area temperature |
| CN111055001A (en) * | 2020-01-03 | 2020-04-24 | 无锡市产品质量监督检验院 | Cement roller press surface additive manufacturing repair device and repair method thereof |
| CN111843143A (en) * | 2020-08-11 | 2020-10-30 | 成都飞匠智能科技有限公司 | Workpiece surface shaping method and system based on plasma air gouging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61172676A (en) * | 1985-01-25 | 1986-08-04 | Hitachi Seiko Ltd | Cutting method of pipe by plasma arc |
| CN101947713B (en) * | 2010-09-17 | 2016-01-06 | 江西恒大高新技术股份有限公司 | A kind of cement roller press roll surface wear-resisting restorative procedure |
| CN103817484B (en) * | 2014-03-17 | 2017-05-17 | 沈阳哈维尔表面工程技术有限公司 | Restoring method used for single-tooth roller crushing mechanism of sintering machine |
| CN104384691B (en) * | 2014-11-14 | 2017-02-22 | 大连华锐重工起重机有限公司 | Device for processing rope grooves of coiling block by utilizing plasma gouging and processing method of device |
| CN205464765U (en) * | 2016-03-31 | 2016-08-17 | 广东省焊接技术研究所（广东省中乌研究院） | System is got rid of to outside of tubes flash butt welding welding seam burr rotation type plasma |
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