WO2017042711A1 - Procédé non invasif de réparation des points d'ancrage du revêtement d'un moulin - Google Patents

Procédé non invasif de réparation des points d'ancrage du revêtement d'un moulin Download PDF

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Publication number
WO2017042711A1
WO2017042711A1 PCT/IB2016/055361 IB2016055361W WO2017042711A1 WO 2017042711 A1 WO2017042711 A1 WO 2017042711A1 IB 2016055361 W IB2016055361 W IB 2016055361W WO 2017042711 A1 WO2017042711 A1 WO 2017042711A1
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WO
WIPO (PCT)
Prior art keywords
mill
mantle
bolts
bolt
invasive method
Prior art date
Application number
PCT/IB2016/055361
Other languages
English (en)
Spanish (es)
Inventor
Werner JAKOB WRANN
Danilo SAN MARTIN TOLEDO
José Luis HULTAZO CARREÑO
Original Assignee
Maestranza Diesel S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maestranza Diesel S.A. filed Critical Maestranza Diesel S.A.
Publication of WO2017042711A1 publication Critical patent/WO2017042711A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H5/00—Combined machining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H5/00—Combined machining
    • B23H5/04—Electrical discharge machining combined with mechanical working

Definitions

  • the present invention relates to the mining industry.
  • the present invention relates to a non-invasive method of repairing the anchor points of a mill liner, such as SAG (Semi Autogenous Grinding) mills.
  • SAG Semi Autogenous Grinding
  • the milling process is done using large rotating equipment or mills in a cylindrical shape, in two different ways: conventional grinding or SAG grinding.
  • Conventional grinding is done in two stages, using bar mill and ball mill, respectively, although only the second one is used in modern plants.
  • SAG SemiAutóGenos
  • SAG mills are larger equipment (1, 1.0 m in diameter and 4.6 m wide) and more efficient than the previous ones. Thanks to their great capacity and efficiency, they shorten the crushing and grinding process.
  • SAG mill It has greater capacity and technology than conventional mills because it grinds larger rocks that come directly from the primary crusher.
  • the main costs in grinding are: energy, coatings and grinding media (balls and bars) that are inside the mills.
  • SAG mills and ball or bar mills are used to release valuable minerals from the rock where they are deposited by reducing their size. Grinding is a process of reduction to dust or pulverization using the mechanical forces of impact, compression, cutting and rubbing of the rock. Due to the aggressive interior environment of the mill, the load that jumps and falls freely should be prevented from colliding with the structure of the mill itself, so that the mantle is protected inside with linings, and these liners are fastened by bolts to the mill mantle .
  • the covers of the SAG mills have a thickness of approximately 50 mm and inside the mill there are plates secured with these bolts, which with normal use of the mill, during milling, oval or deformation of the outer structure is generated of the mill, known as mantle. Specifically, the deformation is generated in the space where the bolts that support the plates pass, said spaces being deformed, generate the leakage of the pulp, liquid or water.
  • the present technology achieves the postponement of the investment by changing grinding equipment when fulfilling its useful life, since it provides a definitive solution for the oval or deformation of the perforations that house the fastening bolts of the mantle lining, and instead If the repair lasts for 6 months, as it is currently, the present technology is not only a corrective maintenance to repair the perforations that house the clamp bolts of the mantle lining, but also improves the life of the mantle to 20 years. In other words, it recovers and increases the life of the mantle, reducing investment costs due to technology change, which translates into savings of the order of magnitude of USD million. As a reference, the value of a SAG mill fluctuates between USD 15 to 30 million depending on its size and has an average life of 15 years.
  • the oval of the perforations that house the clamping bolts of the lining, which are presented in the mills, are sealed by fillers, be they resin and / or polymer seals.
  • the current intervention time is about 2 hours and they do not restore the damaged area, but temporarily patch it. There is no record of any method for restoration of the mill mantle.
  • JP2014137 discloses a method for repairing damage on the part of a coated steel plate, wherein the coating covering the damage is an organometallic compound and additional coating thereof, with an alpha-resin composition. cyanoacrylate and subsequently the damaged part is filled.
  • the method comprises mixing the two urethane elastomer type packages to cover the damaged part and treating the repair with a polyolefin sheet.
  • the method further comprises applying to the broken surface of the mill at least one layer of polyolefin coating and drying it with air.
  • An alpha-cyanoacrylate resin composition is applied to the coating surface with a spatula and, after the composition is cured, the damaged part is filled with one of two urethane elastomer mixture type components and said cure is cured. Elastomer under pressure. Therefore, the application of elastomer does not repair the anchor points of mill bolts (2) to obtain a secure seal of the mill bolts (2) permanently, but only provisionally.
  • the present method to repair the anchor points of the mill bolts to obtain a secure seal of the mill bolts provides a long-term solution to prevent wear of the mantle lining and the filtration of pulp and water due to problems in the perforations where the bolts that hold the lining to the mantle of SAG mills (semi-halogens) and ball mills that are used in the grinding phase within the comminution process within the conductive metal mining are housed and thus, avoid or decrease the detention of the mills for repair.
  • the present method which addresses the problem of the oval of the perforations that house the clamping bolts of the coating has the following advantages: it does not generate structural damage to the mill's mantle; provides a new base to the bolt; avoid mechanical stress concentrations between bolt and mantle; it achieves that the placed shirt creates a complete union with the mantle, favoring the continuity of the efforts, achieving a low concentration of efforts; provides extra protection in the mantle to prevent the occurrence of the same fault, since optimal materials are used in the shirt that is placed in the mantle.
  • Another advantage of the present method is that everything is worked outside the mill and the whole procedure of the method does not last more than 45 minutes, which allows repairs to be made in a very short time, in relation to the repairs that are currently performed.
  • leaks in the mills generate a decrease in the productive capacity, because it is not possible to recover 100% of the spills to return them to the production line. It is estimated that leaks can be 1% of the production of a mill, being a significant cost to the mining company.
  • the pulp leaks through the mill body increase the accumulation of material to levels of high danger because irregularities and elements in the ground are hidden, increasing the risk to the health and safety of people who carry out inspection, operation, cleaning and maintenance activities.
  • the present invention relates to a non-invasive method, to repair the anchor points of a mill bolts (2), to obtain a secure seal of the mill bolts (2), which addresses the problem of the oval of the perforations that They house the clamping bolts of the lining, which occurs in the mills, a method is presented to repair the anchor points of the mill bolts to obtain a secure seal of the mill bolts, and in particular of the rubber seal located between the Mantle of the mill and the concave golilla, preventing pulp leaks.
  • the present invention improves sealing by replacing the damaged surface around the anchor point of a bolt, by a new surface of a jacket of material of greater mechanical resistance and surface finish of superior quality in relation to what is known in the state of the art, where said repair is long term, since it has a shelf life of at least 15 years.
  • the present invention relates to a non-invasive method, to repair the anchor points of a mill bolts (2), to obtain a secure seal of the mill bolts (2), is described through the figures.
  • Figure 1 shows a representative view of a SAG mill (10), with mill bolts (2) running through a mill mantle (1 1).
  • Figure 2 shows a portion of the mill mantle (1 1) with a perforation, which houses a clamping bolt of the oval mantle liner (13), produced by normal working wear of the mill mantle (1 1).
  • Figure 3 shows a view of a shirt (12).
  • Figure 4 shows a representative view of a head support structure (24) with an articulated electrode holder head (20), an electrode (21) that moves according to the drawn arrows, a flame retardant screen (22) in front of the bolt of mill (2), installed in the part of the mill mantle (1 1) to be treated.
  • Figure 5 shows a representative view of a machine tool support structure (26), a machine tool (25) with roughing means (23), which moves according to the drawn arrows, in front of the mill bolt (2) installed in the part of the mill mantle (1 1) to be treated.
  • Figure 6 shows a sectional view of the mill mantle (1 1), the shell or lining of the mantle (14), the mill bolt (2) with nut (3), neck (4), rubber seal (5) ), which prevents the filtration of the mill contents (10) with the mill mantle (1 1) in an ideal working condition.
  • Figure 7 shows a sectional view of the mill mantle (1 1), the shell or lining of the mantle (14), the mill bolt (2) with nut (3), neck (4), rubber seal (5) ), which prevents the filtration of the content of the mill (10) with the mill mantle (1 1) worn with oval (15), whose wear is normally oval, which results in the loss of the seal.
  • Figure 8 shows a sectional view of the mill mantle (1 1), the shell or lining of the mantle (14), the mill bolt (2) with nut (3), neck (4), seal rubber (5), which prevents the filtration of the mill content (10) with the mill mantle (1 1) repaired with the jacket (12).
  • the present invention relates to a non-invasive method, to repair the anchor points of a mill bolts (2), to obtain a secure seal of the mill bolts (2), which comprises the steps of:
  • Step e) further comprises removing between 25% and 85% of the thickness of the mill mantle (1 1) and more preferably between 30% and 50% of the thickness of the mill mantle (1 1).
  • step e the perforation housing the clamping bolt of the mantle lining (13) continues and so on, until it ends with a line of perforations that house the clamping bolts of the clad lining (13) damaged.
  • step j) the installation of the jacket (12) inside the perforation housing the clamp lining bolt (13), which is in the mill mantle (1 1), is mechanically adjusted with interference or with a chemical lock and in another preferred configuration, the installation of the jacket (12) inside the perforation that houses the clamp bolt of the lining of the mantle (13) that is in the mill mantle (1 1), is with the chemical and mechanical adjustment with interference and for better fixation, the chemical trainer is allowed to set at the end of said step j).
  • step j) the installation of the jacket (12) inside the perforation housing the clamp lining bolt (13), which is in the mill mantle (1 1), is With mechanical adjustment with interference, it also includes the steps of:
  • the jacket (12) is cooled to at least -100 ° C and preferably to -180 ° C, and to cool the jacket (12), it is left, for example, in a container with liquid nitrogen or in a refrigerator that reaches these values of preferred temperature.
  • the stage j) also comprises installing the jacket (12) inside the perforation that houses the clamp lining bolt (13) that is made with a hydraulic press and / or with a hammer, with a cylindrical part of the shape of the jacket, but with an internal length greater than the projecting part of the mill bolt (2).
  • step j) in step j), it also comprises cleaning the perforation housing the clamp lining bolt (13), before installing the jacket (12), and once stage j) is finished, roughing with a tool for roughing the protrusions of the shirt (12) with respect to the mill mantle (1 1).
  • step c) further comprises installing a flame retardant screen (22).
  • step c) further comprises cooling with water or with air or with water and air, to minimize the temperature increase in the metal of the mill mantle (1 1) in the areas adjacent to the EDM and maintain the areas adjacent to EDM at a temperature less than 100 ° C, preferably at a temperature less than 50 ° C and more preferably less than 35 ° C.
  • the method was used with the articulated head electrode holder (20) an electro-erosion machine or metal disintegrator, removes the metallic material, particularly the material of the mantle that is the covering part, where said disintegrator can be of alternate 460V, with a power of 20KVA, with a frequency of 50 Hz, with 100 work cycles, where the maximum current can be 500A and a working voltage of 3 to 30 volts.
  • an electro-erosion machine or metal disintegrator removes the metallic material, particularly the material of the mantle that is the covering part, where said disintegrator can be of alternate 460V, with a power of 20KVA, with a frequency of 50 Hz, with 100 work cycles, where the maximum current can be 500A and a working voltage of 3 to 30 volts.
  • Quadrature of the head before the start of the EDM stage was manual, but it can be automatic through position sensors and actuators, such as hydraulic pistons, stepper motors among others.
  • the safety elements are installed, such as a flame retardant screen, the one that contains the sparks, and the water that passes through the electrode, which allowed to keep the working temperature below 35 ° C.
  • the perforation allowed the thread to not be damaged or the center line lost.
  • the time of disintegration or elimination by EDM was 28 min.
  • Electric power operation of the power source, water pumps, Water: Cooling of the power source, cooling the disintegration process and in turn evacuate the metallic waste produced in the process.
  • ⁇ Air Automatic advance operation of the electrode holder head and cooling the vibrator head coil.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)

Abstract

L'invention concerne un procédé non invasif pour réparer les points d'ancrage de boulons de moulin (2) afin d'obtenir une fermeture hermétique sûre des boulons de moulin (2).Le procédé comprend les étapes qui consistent : a) à installer une structure de support (24) d'une tête articulée porte-électrode (20) en face d'un manteau de moulin (11) et en face d'une perforation qui loge le boulon de fixation du revêtement du manteau (13) ; b) à fixer la tête articulée porte-électrode (20) dans la structure de support (24) ; c) à installer une électrode (21) ; d) à positionner l'électrode (21) en face du boulon de moulin (2) monté dans la partie du manteau de moulin (11) à traiter et à centrer l'électrode (21) par rapport audit boulon de moulin (2) ; e) à actionner la tête articulée porte-électrode (20) et à approcher ladite électrode (21) en fonctionnement, pour éliminer le matériau de manteau de moulin (11) par électroérosion ; f) à installer une machine-outil (25) d'enlèvement de copeaux avec des moyens de meulage (23) en face du boulon de moulin (2) monté dans la partie du manteau de moulin (11) à traiter et en face de la perforation qui loge le boulon de fixation du revêtement du manteau (13) ; g) à centrer les moyens de meulage (23) de la machine-outil (25) par rapport audit boulon de moulin (2) ; h) à actionner la machine-outil (25) et à meuler la perforation qui loge le boulon de fixation du revêtement du manteau (13) ; i) à démonter la machine-outil (25) ; j) à installer une chemise (12) à l'intérieur de la perforation qui loge le boulon de fixation du revêtement du manteau (13) ; k) à répéter l'étape a) jusqu'à ce que l'opération soit terminée.
PCT/IB2016/055361 2015-09-08 2016-09-08 Procédé non invasif de réparation des points d'ancrage du revêtement d'un moulin WO2017042711A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201562215443P 2015-09-08 2015-09-08
US62/215,443 2015-09-08

Publications (1)

Publication Number Publication Date
WO2017042711A1 true WO2017042711A1 (fr) 2017-03-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108500409A (zh) * 2018-06-04 2018-09-07 深圳航天科创实业有限公司 一种用于电弧放电铣削加工的标准内冲液增速刀柄

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4992639A (en) * 1988-10-26 1991-02-12 Rolls-Royce Plc Combined EDM and ultrasonic drilling
US20040168288A1 (en) * 2003-02-28 2004-09-02 Mustafizur Rahman Compound fabrication process and apparatus
US20130220826A1 (en) * 2010-09-14 2013-08-29 Yimin Zhan Machining systems and methods
EP2829344A1 (fr) * 2013-07-22 2015-01-28 Merit Precision Tools Limited Procédé de fabrication et d'utilisation d'une pièce à usiner, en particulier une électrode pour une machine à décharge électrique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4992639A (en) * 1988-10-26 1991-02-12 Rolls-Royce Plc Combined EDM and ultrasonic drilling
US20040168288A1 (en) * 2003-02-28 2004-09-02 Mustafizur Rahman Compound fabrication process and apparatus
US20130220826A1 (en) * 2010-09-14 2013-08-29 Yimin Zhan Machining systems and methods
EP2829344A1 (fr) * 2013-07-22 2015-01-28 Merit Precision Tools Limited Procédé de fabrication et d'utilisation d'une pièce à usiner, en particulier une électrode pour une machine à décharge électrique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108500409A (zh) * 2018-06-04 2018-09-07 深圳航天科创实业有限公司 一种用于电弧放电铣削加工的标准内冲液增速刀柄
CN108500409B (zh) * 2018-06-04 2019-12-03 深圳航天科创实业有限公司 一种用于电弧放电铣削加工的标准内冲液增速刀柄

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