AU667452B2

AU667452B2 - Mantle and concave member for a gyratory crusher and method of manufacturing the same

Info

Publication number: AU667452B2
Application number: AU20436/95A
Authority: AU
Inventors: Shoji Inomata; Takeshi Tanaka
Original assignee: Kobe Steel Ltd
Current assignee: Kobe Steel Ltd
Priority date: 1994-06-06
Filing date: 1995-05-31
Publication date: 1996-03-21
Anticipated expiration: 2015-05-31
Also published as: AU2043695A; JPH07328460A; GB2290038A; GB9511322D0; KR960000304A; JP2820890B2; KR0153706B1

Description

l-~C~L_~rr 1 16 10"

AUSTRALIA

Patents Act 1990 KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL,

LTD.)

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT Invention Title: "Mantle and concave member for a gyratory crusher and method of manufacturing the same" orra ~\1(3

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The following statement is a full description of this invention including the best method of performing it known to us:- I, y, I~sl d--r -t .1 4, 0 I ot 0 4.

Field of the Invention This invention relates to a mantle and concave member for a gyratory crusher such as a conecrusher and a method for manufacturing the same.

Description of the Prior Art A conventional cone crusher is shown in Figure 5. The cone crusher has a mantle 1 secured to the head center 2 of a main shaft 3, and a concave member 4 secured to a concave member support forming part of the main body of the crusher. Ore, such as iron ore, supplied to the gap between the mantle 1 and the concave member 4 is crushed through the eccentric spinning action of the main shaft.

Metal Touch and Filler Injection Methods are the conventional methods for securing the mantle to the head center and for securing the concave member to the concave member support.

First, the Metal Touch Method as applied to the mantle shall be explained with reference to Figure 6. The contact surfaces 8 consisting of the inner surface 6 of mantle 1 and outer surface 7 of o0 ao head center 2 are machined so that they are both inclined at the same angle, and the two metal surfaces S are then fitted together to secure the mantle and head center together. The concave member and 0 concave member support are also securea together in exactly the same way.

°o Next, the Filler Injection Method as applied to the mantle shall be explained with reference to 0 00 Figure 7. In this method, only the lower sections of the inner surface 6 of the mantle 1 and the outer surface of the head center 2 are designed to contact each other directly. The remainder of the inner 00 surface 6 of the mantle has a sunken section 9 formed thereon so as to leave a gap between the inner 9 surface of the mantle and the outer surface of the head center when the mantle is assembly-mounted on the head center. In such an assembled condition, a filler material is then injcted into the gap 0000 where it hardens to thereby secure the mantle and head center together. The concave member is secured to the concave member support using the same method, but in this case, it is the outer surface of the concave member which is shaped to have a lower section directly contacting the inner surface of the concave member support, and a sunken section 9 into which a filler material is injected.

In the case of the Metal Touch Method, the surface hardness of the mantle 1 and the concave member 4 is greater than that of their matching parts, the head center 2 and the concave member support 5. As a consequence, if the crusher is used for a long period of time, the surfaces of the head center 2 and the concave member support 5, in particular the uppermost and lowermost sections are worn away to leave indents. If these indents increase in size there is the danger that cracks will be generated in the mantle and concave member, and thus the mantle and concave member are replaced -1 4'~a~ after the crusher has been used to crush a specified quantity of material. On this occasion, the indents are repaired employing build-up welding or by the application of putty, as disclosed in Japanese Patent Publication Sho 59-29046. In the case of repair employing build-up welding, the surface requires plane-finishing etc., and in the case of repair by the application of putty, the surface of the applied putty must be finished and dried.

In either case, a long period of time is required to complete the repair, and during this period the crusher cannot be used with a consequent decrease in productivity.

There does exist a method of increasing the distance over which the surfaces contact so as to prevent the formation of indents, but the consequent unnecessary increase in size from the point of view of the function of the crusher, and increase in machining time contribute to an increase in manufacturing cost.

On the other hand, with the filler injection method a filler material layer is provided between the mantle and the head center, and the concave member and the concave member support, to thereby reduce the amount of direct contact between the mantle and the head center, and the concave member and the concave member support, respectively, whilst achieving a wide area of contact via the filler material layer. This method has the advantage that the degree of damage, such as indents, to the head o center and concave member support can be reduced.

However, the filler material layer takes a long time to harden, and the crusher cannot be used during this hardening period with a consequent decrease in the productivity. Furthermore, the filler material layer shrinks when it hardens to leave a tiny gap. This gap, however tiny, causes the primary contact to take place where the mantle and head center (or concave member and concave member support) make direct contact, resulting in small degree of damage to the surface of the head center 84 t- A I i 3 (or concave support member). This tiny gap is also the cause of cracking and peeling of the filler material layer.

This invention was made in light of the abovedescribed problems in the prior art and has as its objective the provision of a mantle and concave member for a gyratory crusher which are improved in terms of the reduced degree of damage they inflict upon the head center and concave member support, and can be fitted and changed relatively easily without the need to stop the operation of the crusher for a long period of time, and also to provide a method of manufacturing such mantle and concave member.

Summary of the Invention The mantle for a gyratory crusher according to the present invention comprises a mantle for a gyratory crusher comprising a mantle main body having a recessed or sunken section formed on a portion of the inner surface 0 thereof, and a filler material filling said sunken section, which filler material, when applied to the sunken section, extends inwardly of the inner surface of the mantle forming a preformed filler material layer.

o .The concave member for a gyratory crusher according o to the present invention comprises a concave member for a gyratory crusher comprising a concave member main body having a recessed or sunken section formed on a portion of O* 8 the outer surface thereof, and a filler material filling said sunken section, which adhesive filler material, when oapplied to the sunken section, extends outwardly of the outer surface of the concave member forming a pre-formed filler material layer.

By pre-forming the filler material layer on the mantle (or concave member support), the operation of fitting the mantle to the head center can be simplified, and thus the mantle (or concave member) can be replaced quickly with a consequent decrease in the down time of the 57 4U 7- 0S~~ 3/1 crusher and an increase in productivity. Furthermore, since the filler material layer is pre-formed on the mantle (or concave member) the shrinkage of the filler material upon hardening can be taken into account when forming the filler material layer such that no gap is left when the mantle (or concave member) is subsequently fitted on the head center (or concave member support). Thus the generation of cracks and peeling of the filler material layer can be prevented.

Furthermore, since the area over which the surfaces of the mantle and head center (or concave member and concave member support) make direct contact is reduced, the machining time and cost is reduced. Also, since the filler material is formed over a wide area, the total area of contact, direct and indirect, is increased, and thus the degree of retention of the mantle to the head center (or the concave member to the concave member support) is improved, and there is less tendency for damage to occur to the head center or concave member support.

A method of manufacturing a mantle for a gyratory crusher according to the present invention comprises the steps of: preparing a mantle main body which has a recessed or sunken section formed on a portion of the inner surface thereof; preparing a head center mold which has a recessed or o sunken section formed on a portion of the outer surface corresponding to the sunken section of the inner surface of the mantle main body; applying an adhesive to the sunken section of the inner surface of the mantle main body; applying a parting agent to the sunken section of the outer surface of the head center mold; mounting the mantle main body on the head center mold; and 3/2 injecting a filler material into the space created between the sunken section of the head center mold and the sunken section of the main mantle body.

A method of manufacturing a concave member for a gyratory crusher according to the present invention comprises the steps of: preparing a concave member main body which has a recessed or sunken section formed on a portion of the outer surface thereof; preparing a concave member support mold which has a recessed or sunken section formed on a portion of the inner surface corresponding to the sunken section of the outer surface of the concave member main body; applying an adhesive to the sunken section of the outer surface of the concave member main body; applying a parting agent to the sunken section of the inner surface of the concave member support mold; mounting the concave member main body on the concave S" member support mold; and injecting a filler material into the space created between the sunken section of the concave member support mold and the sunken section of the concave member main body.

S' 1 S 0 i .4 .4 o 1 hi I. 1 i:i* ^ia In the above-described methods of manufacturing a mantle and concave member, the application of a parting agent to the sunken section of the head center mold (or concave member support mold) ensures that the filler material layer easily becomes separated from the mold when it hardens and shrinks. Also, the application of an adhesive to the sunken section of the mantle main body ensures that the filler material layer of a specified thickness is properly adhered to the sunken section of the mantle main body (or concave member main body).

Brief Description of the Drawings Figure l(a) is a diagram of the apparatus used in the method of manufacturing a mantle according to the present invention, and Figure 1 is a enlarged view of the section marked X in Figure l(a).

Figure 2 is a cross-sectional view of a mantle according to the present invention.

Figure 3(a) is a diagram of the apparatus used in the method of manufacturing a concave member according to the present invention, and Figure 3(b) is an enlargcd view of the section marked Y in Figure 3(b).

Figure 4 is a cross-sectional view of a concave member according to the present invention.

I16 Figure 5 is a cross-sectional view of a cone crusher.

Figure 6 is a cross-sectional view showing a prior art mantle as attached to a head center.

Figure 7 is a cross-sectional view showing a another prior art mantle as attached to a head center.

o o 0 0 Description of the Embodiments .4 Embodiments of the present invention shall be explained with reference to the accompanying d0 Figures, and components common to the embodiments of the invention and the prior art described o o° earlier are labeled with common reference numerals.

0 0 Embodiment 1 Figures l(a) and show apparatus used in the method of manufacturing a mantle according to the present invention. Figure 1(a) is a vertical cross-sectional view, and Figure l(b) is an enlarged view of section X of Figure 1 denotes the mantle, la denotes the main body of the mantle, and 11 denotes a head center mold, the upper surface of which has a similar shape to that of the actual head center 2. With the exception of the lower portion 13, which is designed to make direct contact with the outer surface of the head center, the inner surface of the mantle main body la has a sunken section 16 formed thereon for receiving the filler material layer. An adhesive is applied to the surface bO of this sunken section 16, after which the mantle main body la is assembly-mounted onto the upper surface of the head center mold 11.

In order to facilitate the flow of filler material during the injection stage, it is preperred that the i -I depth hi, of the sunken section 16 be at least 5mm or greater, and even more preferably at least or greater.

The lower portion of the upper surface 12 of the head center mold 11 is shaped to directly contact the lower portion of the inner surface of the mantle main body la. The portion of the inner surface extending upwards therefrom has a sunken section 17 formed thereon. This sunken section 17 is provided to take into account the shrinkage of the filler material upon hardening A parting agent is applied to the surface of this sunken section 17. A suitable depth, h2, for the sunken section 17 is determined by summing the degree of linear contraction of the filler material (calculated from the liner contraction ratio of the filler material), the thickness of the film of parting agent applied, and a constant a where a is determined from the degree of deformation, caused by surface pressure and strain, when the mantle is fixed to the head center, and the degree of deformation, caused by surface pressure and strain, during the crushing operation, etc.

When the head center mold 11 and mantle main body la have been assembled together in the way described above, a pre-prepared molten filler material is injected into the space formed by the sunken sections 16 and 17, from an opening 18 located at the top of the mantle main body la. The injected filler material is then left to harden for a few days, after which the head center mold 11 is removed to leave, as shown in Figure 2, a mantle 1 having a filler material layer 15 on its inner surface. This mantle is then transported to the place where the crusher is being assembled or repaired, and assembly-mounted onto the head center of the crusher. Since the mantle has a filler o o material layer on the inner surface thereof, it can be fitted onto the head center almost as easily as is 0 possible in the Metal Touch Method, and the length of stoppage time of the crusher required for mantle replacement can be reduced to a large degree, thereby improving the productivity. Also, since the filler material layer can be applied without leaving any gap, there is no occurrence of cracking or peeling of the filler material layer.

Furthermore, the size of the area of direct contact between the head center and the mantle can be reduced, with a consequent reduction in the machining cost. Also, since the filler material layer can be formed over a wide area, the total area of direct and indirect contact is increased, the degree of retention of the mantle is improved, and there is less tendency for damage to the surface of the head S center to occur.

0 0 ;O Second Embodiment Figures 3(a) and 3(b) show apparatus used in a method of manufacturing a concave member according to the present invention. Figure 3(a) is a vertical cross-sectional view of the whole apparatus and Figure 3(b) is an enlarged view of section Y of Figure 3(a).

4 denotes the concave member, 4a denotes the main body of the concave member, and 19 0' -t -6 denotes a concave member support mold having a inner surface shaped similar to the inner surface of an actual concave member support.

The lower portion 21 of the outer surface 22 of the concave member main body 4a is shaped to make direct contact with the lower portion of the inner surface of the concave member support, and the section 24 extending upwards therefrom is sunken in order to receive the filler material. An adhesive is applied to the surface of this sunken section 24, and the concave member is then assembly mounted onto the inner surface 20 of the concave member support mold 19. In order to facilitate the flow of filler material during injection, it is preferred that the depth, H1, of the sunken section be at least 5mm and more preferably at least The lower portion of the inner surface of the concave member support mold 19 is shaped to make direct contact with the lower portion 21 of the outer surface of the concave member main body 4a, but the section 25 of the surface extending upwards therefrom is sunken in order to take into account the shrinkage of the filler material upon hardening. A parting agent is applied to the surface of this sunken section 25. A suitable depth, H2, for the sunken section 25 of the concave member V! support mold 19 can be determined in the same way as determined in the case of the sunken section of the head center mold in embodiment 1.

'o After the concave member support mold 19 and concave member main body 4a have been o" assembled together, a pre-prepared molten filler material is injected from an opening 26 located at the o i upper portion of the concave member support mold 19 into the gap created by the sunken sections S o00 24 of the concave member support mold 19 and concave member main body 4a. The filler material 0 0 is then left to harden for a few days, after which the concave member support mold 19 is removed to leave a finished concave member 4 having a filler material layer 23 on the inner surface thereof.

0, 0 The concave member 4 produced in the above-described fashion is then transported to the S place where the crusher is being repaired or assembled, and is fitted onto the concave member Ssupport of the crusher. Since the concave member has a filler material layer on the inner surface thereof, it can be fitted onto the concave member support almost as easily as is possible in the Metal Touch Method, and the length of stoppage time of the crusher required for concave member replacement can be reduced to a large extent, thereby improving the productivity. Also, since the ol .E filler material layer can be applied without leaving any gap, there is no occurrence of cracking or S' X) peeling of the filler material layer.

Furthermore, the size of the area of direct contact between the concave member support and the concave member can be made small, with a consequent reduction in the cost of machining. Also, since the filler material layer can be formed over a wide area, the total area of direct and indirect contact is increased, resulting in an improvement in the degree of retention of the mantle, and less tendency for damage to the surface of the concave member support to occur.

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ui;iuPiis~pl-- In either of the embodiments described above, it is preferred that a filler material having a relatively low melting temperature (20-30 0 C) and a linear compression ratio in the range of 1% be used. For example, epoxy-resin based materials are suitable as the filler material.

oo 0 00 0 -7- 0 0 00 -7- 0 0 A~ 01 0

Claims

2. A method of manufacturing a mantle for a gyratory crusher comprising the steps of: preparing a mantle main body which has a recessed or sunken section formed on a portion of the inner surface thereof; preparing a head center mold which has a recessed or sunken section formed on a portion of the outer surface corresponding to the sunken section of the inner surface of the mantle main body; applying an adhesive to the sunken section of the inner surface of the mantle main body; applying a parting agent to the sunken section of the outer surface of the head center mold; mounting the mantle main body on the head center mold; and injecting a filler material into the space created between the sunken section of the head center mold and the a sunken section of the main mantle body. i 3. A concave member for a gyratory crusher comprising a concave member main body having a recessed or sunken section formed on a portion of the outer surface thereof, and a filler material filling said sunken section, which adhesive filler material, when applied to the sunken section, extends outwardly of the outer surface of the concave member forming a pre-formed filler material layer.
4. A method of manufacturing a concave member for a gyratory crusher comprising the steps of:
7- O II l---rarrvaesn~; preparing a concave member main body which has a recessed or sunken section formed on a portion of the outer surface thereof; preparing a concave member support mold which has a recessed or sunken section formed on a portion of the inner surface corresponding to the sunken section of the outer surface of the concave member main body; applying an adhesive to the sunken section of the outer surface of the concave member main body; applying a parting agent to the sunken section of the inner surface of the concave member support mold; mounting the concave member main body on the concave member support mold; and injecting a filler material into the space created between the sunken section of the concave member support mold and the sunken section of the concave member main body. A method of manufacturing a mantle for a gyratory crusher substantially as hereinbefore described with reference to Figs. l(a) and l(b) of the accompanying drawings. 6. A mantle when produced by the method of claim 7. A method of manufacturing a concave member for a gyratory crusher substantially as hereinbefore described with reference to Figs. 3(a) and 3(b) of the accompanying drawings.
8. A concave member when produced hy method of claim 7. DATED this 5th day of January 1996 0 00 6sa o 0 0 KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL LTD) Patent Attorneys for the Applicant: F.B. RICE CO. 03~- ABSTRACT A mantle for a gyratory crusher having a filler material layer formed on the inner surface of the main body of the mantle before the mantle is assembly-mounted onto the head center of the crusher. A concave member for a gyratory crusher having a filler material layer formed on the outer surface of the main body of the concave member, before the concave member is assembly-mounted onto the concave member support of the crusher. i sil