Screw blade system, replacement kit, vertical grinder and its installation method

Abstract

A screw blade system (2) is disclosed, comprising a helical screw blade (21) and at least one wear-resistant liner element (22). According to this disclosure, the screw blade system (2) further includes a guiding system comprising at least one guide pin (32) configured to be disposed on one of the helical screw blade (21) and the at least one wear-resistant liner element (22), and at least one guide hole (42) disposed on the other of the helical screw blade (21) and the at least one wear-resistant liner element (22), wherein the at least one guide hole (42) is configured to receive at least one guide pin (32). A vertical grinding machine (1) including the screw blade system (2), a wear-resistant liner element (22) replacement kit, and a method for installing the same are also disclosed.

Description

Technical Field

[0001] This disclosure relates to an agitator assembly for a vertical grinder. In particular, this disclosure relates to a screw flight system (also known as a helical blade system or threaded blade system) comprising helical screw blades and at least one wear-resistant lining element. A vertical grinder including the screw flight system, a replacement kit for the wear-resistant lining element of the screw flight system, and a method for installing the same are also disclosed. Background Technology

[0002] Vertical grinding mills are known, for example, by US4,660,776 and the manual "VERTIMILL". TM "Fine and ultrafine wet grinding" is known. Vertical grinding mills have a chamber in which an agitator is positioned. Grinding media, for example made of steel or ceramic and having various shapes such as spherical or natural pebble, are placed in the chamber. Water, the material to be ground, and optional additives are fed into the chamber. By rotating the agitator, the material is agitated, allowing the grinding media to grind the material through friction and abrasion. The two references above disclose vertically arranged stirred mills. However, the same general principles can be applied to, for example, inclined stirred mills.

[0003] The chamber holds the grinding media, and in the case of a vertically mounted mill, the chamber also supports drive components including a stirrer.

[0004] In Vertimill TM In this process, an agitator rotates and imparts motion to the grinding media. The agitator includes an internally welded screw blade system that supports multiple external wear-resistant liner elements, which are bolted to the welded screw blade system. These wear-resistant liner elements need to be replaced when depleted. The wear-resistant liner elements are large and heavy, and access for replacement is limited. In short, this makes it difficult to effectively position and secure the wear-resistant liner elements to the screw blades. Summary of the Invention

[0005] One object of this disclosure is to provide a screw blade system that reduces replacement time.

[0006] According to a first aspect of this disclosure, the aforementioned and other objectives are achieved, in whole or at least in part, by a screw blade system comprising a helical screw blade and at least one wear-resistant liner element. According to this first aspect, the screw blade system further includes a guiding system. The guiding system includes at least one guide pin configured to be disposed on one of the helical screw blade and the at least one wear-resistant liner element, and at least one guide hole configured to receive the at least one guide pin on the other of the helical screw blade and the at least one wear-resistant liner element.

[0007] By providing a guide system for the screw blade system, time-consuming replacement time can be significantly reduced, and it is easier to keep the wear-resistant liner elements in place when aligning and fastening them to the screw blades.

[0008] According to one embodiment of the screw blade system, the helical screw blade and at least one wear-resistant liner element may have a set of through bolt holes arranged along a first line, wherein at least one guide pin and at least one guide hole are radially displaced or offset about the first line.

[0009] By setting the guide hole and guide pin to be radially displaced about the through bolt hole, fastening of the bolted connection can be completed without removing at least one guide pin before fastening is completed.

[0010] According to another embodiment of the screw blade system, the guiding system may include at least two guide pins and at least two guide holes, with the at least two guide pins and at least two guide holes disposed on opposite sides of the first line. Furthermore, the at least two guide pins and at least two guide holes may be displaced along the helical extension of the helical screw blade and at least one wear-resistant liner element. By disposing the two guide pins and at least two guide holes on opposite sides of the first line, the wear-resistant liner element is secured and held in place, even better than using only one guide pin and guide hole during the fastening of the wear-resistant liner element to the helical screw blade, and by displacing the at least two guide pins and at least two guide holes along the helical extension, the weight distribution on the at least two guide pins (when positioned in the corresponding guide holes) is more uniform.

[0011] According to one embodiment of the screw blade system, at least one guide pin may be configured to be removable from either the helical screw blade or the wear-resistant liner element.

[0012] According to one embodiment of the screw blade system, at least one guide pin may be configured to be disposed on at least one wear-resistant liner element, and at least one guide hole is disposed on the helical screw blade. Furthermore, at least one wear-resistant liner element may include at least one insert, and wherein at least one guide pin is configured to engage at least one insert by threading.

[0013] In one embodiment of the screw blade system, at least one insert may be disposed in the through-hole, and wherein the at least one insert further includes a borehole configured to receive and engage a lug or protective plug. Furthermore, at least one wear-resistant liner element may include a protrusion on a surface configured to face away from the helical screw blade, the protrusion at least partially surrounding the borehole, and such a protrusion at least partially surrounding the borehole as seen along the leading edge of at least one wear-resistant liner element. By disposing such an insert in the through-hole and protecting the borehole with a protective plug during operation, the borehole can be used to receive and engage the lug when the wear-resistant liner element is worn out and removed, and the positioning of the borehole is estimated to correspond to the center of gravity when the wear-resistant liner element is worn out. Therefore, using this borehole for the lug ensures controlled and stable removal of the worn wear-resistant liner element when replacing it with a new one.

[0014] According to a second aspect of this disclosure, the above-mentioned and other objectives can also be achieved, in whole or in part, by a vertical grinding mill comprising a screw blade system according to any of the above embodiments or a combination thereof.

[0015] Similarly, and corresponding to the screw blade system, a vertical grinding machine having the screw blade system of this disclosure will provide essentially the same advantages as prior art solutions.

[0016] According to a third aspect of this disclosure, the above and other objectives can also be wholly or at least partially achieved by a replacement kit for a wear-resistant liner element of a screw blade system in a vertical mill. According to this third aspect, the replacement kit includes a wear-resistant liner element and at least two guide pins configured to be disposed on the wear-resistant liner element.

[0017] According to one embodiment of the replacement kit, the wear-resistant lining element may have a set of through bolt holes arranged along a first line, and at least two guide pins may be configured to be radially displaced on opposite sides of the first line.

[0018] According to one embodiment of the replacement kit, at least two guide pins are displaced along the spiral extension of the wear-resistant lining element.

[0019] According to another embodiment of the replacement kit, the abrasion-resistant lining element may include at least two inserts, and at least two guide pins are configured to engage at least two inserts by interlocking.

[0020] According to another embodiment of the replacement kit, at least one insert may be disposed in the through channel, and at least one insert may also include a drilled hole configured to receive and engage a lug or protective plug. Furthermore, the abrasion-resistant lining element may include a protrusion that at least partially surrounds the drilled hole, as seen along the leading edge of the abrasion-resistant lining element.

[0021] Similarly, and corresponding to the screw blade system, the replacement kit disclosed herein will provide essentially the same advantages relative to existing solutions.

[0022] According to a fourth aspect of this disclosure, the aforementioned and other objectives are also achieved, in whole or at least in part, by a method of mounting a screw blade system. According to this fourth aspect of the disclosure, the method includes providing a helical screw blade and at least one wear-resistant liner element; disposing at least one guide pin on at least one wear-resistant liner element; lifting at least one wear-resistant liner element and aligning the at least one guide pin with at least one complementary guide hole disposed in the helical screw blade; and lowering at least one wear-resistant liner element onto the helical screw blade.

[0023] According to one embodiment of the method, the method may further include fastening at least one wear-resistant lining element to the helical screw blade via bolted connections.

[0024] Similarly, and corresponding to the screw blade system, the method for mounting the screw blade system disclosed herein will provide essentially the same advantages as prior art solutions.

[0025] Other objects, features, and advantages of this disclosure will become apparent from the following detailed disclosure, the appended claims, and the accompanying drawings. It should be noted that this disclosure relates to all possible combinations of features.

[0026] Generally, unless otherwise expressly defined herein, all terms used in the claims shall be interpreted according to their general meaning in the art. Unless otherwise expressly stated, all references to "a / an / the (element, device, component, apparatus, step, etc.)" shall be interpreted in an open-ended manner as referring to at least one instance of said element, device, component, apparatus, step, etc. Unless expressly stated otherwise, the steps of any method disclosed herein need not be performed in the exact order disclosed.

[0027] As used in this application, the term "comprising" and its variations are not intended to exclude other additives, components, wholes or steps. Attached Figure Description

[0028] The present disclosure will now be described in more detail with reference to the accompanying drawings, which illustrate examples of currently preferred embodiments of the present disclosure.

[0029] Figure 1a It is a three-dimensional diagram of a typical vertical grinding machine based on existing technology.

[0030] Figure 1b This is an internal view of the grinding chamber during grinding, based on existing technology.

[0031] Figure 2a This is a perspective view of a stirrer device according to the prior art, the stirrer device including a helical screw blade on which wear-resistant lining elements are disposed.

[0032] Figure 2b yes Figure 2a A three-dimensional diagram of the spiral screw blades, but without wear-resistant lining elements.

[0033] Figure 3a This is a perspective view of a wear-resistant lining element according to an embodiment of the present disclosure.

[0034] Figure 3b yes Figure 3a A cross-sectional view of the wear-resistant lining element in the image.

[0035] Figure 3c This is a perspective view of a portion of a helical screw blade according to an embodiment of the present disclosure.

[0036] Figure 3d This is a 3D diagram of the screw blade system, in which... Figure 3a and Figure 3b The wear-resistant lining elements are installed to Figure 3c Spiral screw blades.

[0037] Figure 4a This is a perspective view of a wear-resistant lining element according to another embodiment of the present disclosure.

[0038] Figure 4b This is a perspective view of a helical screw blade according to another embodiment of the present disclosure.

[0039] Figure 4c This is a 3D diagram of the screw blade system, in which... Figure 4a The wear-resistant lining elements are installed to Figure 4b Spiral screw blades.

[0040] Figure 5a This is a perspective view of a wear-resistant lining element according to another embodiment of the present disclosure.

[0041] Figure 5b yes Figure 5a A cross-sectional view of the wear-resistant lining element in the image.

[0042] Figure 5c This is a perspective view of a helical screw blade according to another embodiment of the present disclosure.

[0043] Figure 5d This is a 3D diagram of the screw blade system, in which... Figure 5a and Figure 5b The wear-resistant lining elements are installed to Figure 5c Spiral screw blades.

[0044] Figure 6a This is a perspective view of a wear-resistant lining element according to another embodiment of the present disclosure.

[0045] Figure 6b yes Figure 6a A cross-sectional view of the wear-resistant lining element in the image.

[0046] Figure 6c This is a perspective view of a helical screw blade according to another embodiment of the present disclosure.

[0047] Figure 6d This is a 3D diagram of the screw blade system, in which... Figure 6a and Figure 6b The wear-resistant lining elements are installed to Figure 6c Spiral screw blades.

[0048] Figure 6e yes Figure 6d Another perspective view of the screw blade system.

[0049] Figure 7 It is a perspective view of a vertical grinding mill, wherein the replacement wear-resistant lining element according to this disclosure has been installed on the helical screw blades inside the vertical grinding mill.

[0050] Figure 8a This is a perspective view of a worn wear-resistant lining element according to an embodiment of the present disclosure.

[0051] Figure 8b This is a perspective view of a replacement wear-resistant lining element according to an embodiment of the present disclosure.

[0052] Figure 9 It is a perspective view of a vertical grinding machine according to this disclosure, in which a screw blade system is used. Detailed Implementation

[0053] The present disclosure will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the disclosure are illustrated. However, the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the disclosure to those skilled in the art. The same reference numerals refer to the same elements throughout the text.

[0054] Figure 1a A vertical grinding mill 1 according to the prior art is shown. This stirred mill includes a stirrer 2, which is arranged in the form of a screw blade system within a grinding chamber 3. Figure 1b As shown, chamber 3 is filled with abrasive media 4, which may be made of steel or ceramic and may have different shapes such as spherical or natural pebble-shaped. A slurry of water, the material to be ground, and optional additives is fed to an opening 8 located at the top of chamber 3, and agitator 2 is rotated, thereby agitating and moving the abrasive media 4, which grinds the material to be ground within chamber 3. Agitator 2, i.e., a screw blade system, includes a central shaft with helical screw blades on which wear-resistant lining elements are provided. The helical screw blades and their wear-resistant elements provide an upward flow along the wear-resistant elements and shaft during agitation, and provide particle classification in the upper part of chamber 3. When the particles have been ground to a sufficiently small size, these particles rise toward the upper part of chamber 3 and are removed via overflow trough 10, while larger and heavier particles are attracted by gravity to the downward flow between the outer periphery of the wear-resistant lining element of agitator 2 and the outer wall of chamber 3, and are subsequently drawn into the upward flow along the wear-resistant elements and shaft of agitator 2 for further grinding.

[0055] like Figure 1a and Figure 1b As shown, chamber 3 holds the grinding media 4 and also supports drive components 5, such as drive shaft 5a, thrust bearing 5b, gear reducer 5c, and motor 5d. Grinding chamber 3 and agitator 2 can be accessed through access door 7 for maintenance.

[0056] Figure 2a A stirrer 2 according to the prior art is shown, which includes an internally welded helical screw blade 21 supported by a shaft 23. The helical screw blade 21 supports a plurality of wear-resistant lining elements 22, which are bolted to the helical screw blade 21.

[0057] Figure 2b The spiral screw blades 21 are shown welded to the shaft 23, but without the wear-resistant lining element 22.

[0058] Figures 3a-3d A screw blade system according to an embodiment of the present disclosure is shown. Figure 3aThe image shows the first surface 30 of the wear-resistant lining element 22. The wear-resistant lining element 22 has a radial extension R and a helical extension H. A set of through bolt holes 31 are provided along the first line L in the wear-resistant lining element along the helical extension H of the wear-resistant lining element 22. Furthermore, guide pins 32 are provided on the first surface 30 of the wear-resistant lining element 22. Figure 3b As shown, the insert 33 is positioned as follows: Figures 3a-3b The wear-resistant lining element 22 is shown in a recess 34 on the first side 30, and a guide pin 32 engages the insert by means of insertion. The guide pin is configured to be radially displaced relative to the through bolt hole 31.

[0059] Figure 3c The image shows a portion of a helical screw blade 21. This helical screw blade 21 also has a radial extension R and a helical extension H, and a set of through bolt holes 41 are provided along a first line L in the helical extension H of the helical screw blade 21, the first line L being at a uniform radial distance from the central axis C of the helical screw blade 21. The helical screw blade 21 also has guide holes 42, which are radially displaced relative to the set of through bolt holes 41 at predetermined distances along the helical extension H of the helical screw blade 21. These distances correspond to the positioning of the guide pin 32 on the wear-resistant liner element 22 and the helical extension H of the wear-resistant liner element 22.

[0060] exist Figure 3d In this process, the wear-resistant liner element 22 is raised and the guide pin 32 is aligned with the complementary guide hole 42 provided on the helical screw blade, and the wear-resistant liner element 22 is lowered onto the helical screw blade 21. The wear-resistant liner element 22 is now positioned on the helical screw blade. After the wear-resistant liner element is positioned, it is connected by bolts in a set of through bolt holes 31, 41 provided in the wear-resistant liner element 22 and the helical screw blade 21. Figure 3d (Not shown) is fastened to the helical screw blade 21, and the set of through bolt holes 31, 41 are aligned when the guide pin 32 is received in the guide hole 42.

[0061] Figures 4a-4c A screw blade system according to another embodiment of the present disclosure is shown. In this embodiment, two guide pins 32 are provided on each wear-resistant liner element 22. Figure 4a As seen, the guide pin 32 is configured to be radially displaced about the set of through bolt holes along the first line L, and is located in a radial extension on the opposite side of the first line L. Figure 4bAs seen, the helical screw blade 21 has guide holes 42. In the case where a set of two guide holes 42 are located in the radial extension on opposite sides of the first line L, these guide holes 42 are radially displaced with respect to the set of through bolt holes 41. Multiple sets of such guide holes 42 are provided at predetermined distances along the helical extension H of the helical screw blade 21, these predetermined distances corresponding to the positioning of the two guide pins 32 on the wear-resistant liner element 22 and the helical extension H of the wear-resistant liner element 22. Figure 4c In the process, the wear-resistant liner element 22 is raised and the guide pin 32 is aligned with the complementary guide hole 42 provided in the helical screw blade, and the wear-resistant liner element 22 is lowered onto the helical screw blade 21. The wear-resistant liner element 22 is now positioned on the helical screw blade. After the wear-resistant liner element is positioned, the wear-resistant liner element 22 is connected by bolts ( Figure 4c (Not shown) are fastened to the helical screw blade 21. These bolted connections are provided in the set of through bolt holes 31, 41 of the wear-resistant liner element 22 and the helical screw blade 21, which are aligned when the guide pin 22 is received in the guide hole 42.

[0062] Figures 5a-5d A screw blade system according to a further embodiment of this disclosure is shown. For example... Figure 5a As seen, the two guide pins 32 are configured to be radially displaced on opposite sides of the set of through bolt holes 31 along the first line L. Further, in this embodiment, the two guide pins 32 are displaced along the helical extension H of the wear-resistant lining element 22. Figure 5b As seen, the insert 33 is disposed in the recess 34 on the first side 30 of the wear-resistant lining element 22, and the guide pin 32 engages the insert by means of insertion.

[0063] exist Figure 5c In the diagram, the helical screw blade 21 is used for... Figure 5a and Figure 5b The wear-resistant lining element 22 is located within the spiral screw blade 21. This spiral screw blade 21 has guide holes 42 that are radially displaced with respect to a set of through bolt holes 41 along the first line L. In this embodiment, these two guide holes 42 are positioned on opposite sides of the first line L and displaced along the spiral extension H of the spiral screw blade 21. Multiple sets of such guide holes 42 are positioned at predetermined distances along the spiral extension H of the spiral screw blade 21, these distances corresponding to the positioning of the two guide pins 32 on the wear-resistant lining element 22 and the spiral extension H of the wear-resistant lining element 22.

[0064] exist Figure 5dIn this process, the wear-resistant liner element 22 is raised and the guide pin 32 is aligned with the complementary guide hole 42 provided in the helical screw blade, and the wear-resistant liner element 22 is lowered onto the helical screw blade 21. The wear-resistant liner element 22 is now positioned on the helical screw blade. After the wear-resistant liner element is positioned, the wear-resistant liner element 22 is connected by bolts ( Figure 5d (Not shown) are fastened to the helical screw blade 21. These bolted connections are provided in the set of through bolt holes 31, 41 of the wear-resistant liner element 22 and the helical screw blade 21, which are aligned when the guide pin 22 is received in the guide hole 42.

[0065] Figures 6a-6e A screw blade system according to a further embodiment of this disclosure is shown. For example... Figure 6a As seen, the two guide pins 32 are configured to be radially displaced on opposite sides of the set of through bolt holes 31 along the first line L. Like Figures 5a-5d As in the illustrated embodiment, the two guide pins 32 are also displaced along the spiral extension H of the wear-resistant lining element 22. However, as... Figure 6b As seen, an insert 33 is disposed in a recess 34 on the first side 30 of the wear-resistant lining element 22, as in the embodiment described above, while a second insert 33' is disposed in a through channel 35. A guide pin 32 engages with the first insert 33 and the second insert 33' by insertion. The second insert 33' also includes a drilled hole 36, which is configured to receive and engage the lug 52 (e.g., ...). Figure 8a (as shown) or protective plug 37 (as shown) Figure 6e (As shown in the diagram). The borehole 36 can be accessed from the second surface 38 of the wear-resistant liner element 22, which is configured to face away from the helical screw blades. In this embodiment, the wear-resistant liner element 22 also includes a protrusion 39 on the second surface 38, which at least partially surrounds the borehole 36 of the through channel 35 and the second insert 33'. In this embodiment, the protrusion 39 is arranged to at least partially surround the borehole 36, as observed along the leading edge of the wear-resistant liner element 22. During operation, the protrusion 39 will at least partially protect the protective plug. When the wear-resistant liner element 22 is depleted, the borehole 36 can be used to receive and engage the lifting lugs so that the lifting point can lift the wear-resistant liner element 22 from the helical screw blades and remove it from the grinding chamber 3. The positioning of the borehole 36 is aligned with the estimated center of gravity of the worn wear-resistant liner element 22.

[0066] exist Figure 6c In the diagram, the helical screw blade 21 is used for... Figure 6a and Figure 6bThe wear-resistant lining element in the spiral screw blade 21 has a guide hole 42, which is radially displaced about the set of through bolt holes 41 along the first line L, and like... Figures 5a-5d Similar to the embodiment described above, a set of two guide holes 42 are provided on opposite sides of the first line L, and these two guide holes 42 are displaced along the helical extension H of the helical screw blade 21. Multiple sets of such guide holes 42 are provided at predetermined distances along the helical extension H of the helical screw blade 21, these distances corresponding to the positioning of the two guide pins 32 on the wear-resistant liner element 22 and the helical extension H of the wear-resistant liner element 22.

[0067] exist Figure 6d In this process, the wear-resistant liner element 22 is raised and the guide pin 32 is aligned with the complementary guide hole 42 provided in the helical screw blade, and the wear-resistant liner element 22 is lowered onto the helical screw blade 21, so that the wear-resistant liner element 22 is positioned on the helical screw blade. After the wear-resistant liner element is positioned, the wear-resistant liner element 22 is connected by bolts ( Figure 6d Not shown in the image, but... Figure 6e (As shown in the figure) These bolted connections are fastened to the helical screw blade 21 and are provided in the set of through bolt holes 31, 41 of the wear-resistant liner element 22 and the helical screw blade 21, which are aligned when the guide pin 22 is received in the guide hole 42.

[0068] Figure 6e The different 3D diagrams show Figure 6d Screw blade system, in Figure 6e The second surface 38 of the wear-resistant lining element 22 is shown. Here, the protrusion 39 is shown more clearly, and in particular, how the protrusion 39 partially surrounds the bore 36 and the protective plug 37 disposed within the bore, as seen along the leading edge of the wear-resistant lining element 22. Figure 6e In the middle, the wear-resistant lining element 22 is fastened to the helical screw blade 21 by bolt fastener 50.

[0069] All the guide pins 32 disclosed above are configured to be removable from the wear-resistant liner element 22, particularly when the guide pins 32 are threadedly installed on the wear-resistant liner element. Thus, once the wear-resistant liner element 22 has been fastened to the helical screw blades by means of fastening devices such as bolted connectors 50, the guide pins 32 can be removed from the wear-resistant liner element 22. However, the guide pins 32 may also be allowed to remain in place, as they will wear down under the operation of the vertical grinder and will not affect the grinding operation.

[0070] Figure 7The grinding chamber 3 of the vertical grinder 1 is shown, along with the agitator 2, shaft 23, helical screw blades 21, and wear-resistant lining element 22 positioned on the helical screw blades.

[0071] like Figure 7 As seen in the present invention, the space available for installing and removing the wear-resistant lining element 22 is limited, and it is important to perform such installation and removal in an efficient and time-saving manner. This disclosure provides such a solution.

[0072] Figures 3a-3b , Figure 4a , Figures 5a-5b ,as well as Figures 6a-6b Different embodiments of replacement kits for wear-resistant lining elements according to this disclosure are shown.

[0073] As mentioned above Figures 6a-6e As disclosed in the embodiments, the borehole 36 can receive a lifting lug for removing the worn wear-resistant liner element 22 from the screw blade system 2. Figure 8a In the illustration, such a lug 52 is shown disposed in a drilled hole 36 of the worn wear-resistant lining element 22. When the wear-resistant lining element is exhausted, the position of the drilled hole 36 and the lug 52 received therein is estimated to be located at the center of gravity of the worn wear-resistant lining element 22.

[0074] The new wear-resistant liner element 22 used to replace the worn wear-resistant liner element 22 has another center of gravity, and as... Figure 8b As shown, another lifting lug 54 may be provided in the wear-resistant lining element to lift the new wear-resistant lining element 22 into place using the guiding system according to this disclosure. Other lifting devices, such as those disclosed in AU2014201893, may also be used for the new, unworn wear-resistant lining element 22.

[0075] Figure 9 The image shows a vertical grinding machine 1, one aspect of the present invention. The screw blade system 2 disclosed above is used in this vertical grinding machine 1. Figure 9 As seen, the wear-resistant lining element 22 is positioned and secured to the helical screw blade 21 by means of bolted connectors 50 to form an agitator 2 within the grinding chamber 3. Figure 9 As seen above, after the bolted connector 50 is tightened, the guide pin 32 remains attached to the wear-resistant lining element 22, but it can also be removed before starting the vertical grinder 1 for grinding operations, as disclosed above.

[0076] Those skilled in the art will recognize that this disclosure is by no means limited to the preferred embodiments described above. Rather, many modifications and variations are possible within the scope of the appended claims.

[0077] For example, the through bolt holes 31, 41 in the wear-resistant lining element and the helical screw blade do not need to be arranged along the first line L at a uniform radial position along the helical extension of the wear-resistant lining element and the helical screw blade. The through bolt holes can be arranged to be radially offset relative to each other, for example, two rows of through bolt holes are radially offset along the helical extension.

[0078] Furthermore, in the above embodiment, the guide pin 32 is disposed on the wear-resistant liner element 22, and the guide hole 42 is disposed in the helical screw blade 21. However, the reverse arrangement is also applicable. Therefore, the guide pin 32 can be disposed on the helical screw blade 21, and the guide hole 42 can be disposed in the wear-resistant liner element 22.

[0079] Furthermore, by studying the accompanying drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments when practicing the claimed disclosure.

[0080] The following differences are disclosed in this application:

[0081] Item 1. A screw blade system (2) comprising helical screw blades (21) and at least one wear-resistant lining element (22), wherein the screw blade system (2) further comprises a guiding system, the guiding system comprising:

[0082] At least one guide pin (32) adapted to be disposed on one of the helical screw blade (21) and the at least one wear-resistant lining element (22), and

[0083] At least one guide hole (42) is provided on the other of the helical screw blade (21) and the at least one wear-resistant lining element (22), the at least one guide hole (42) being adapted to receive the at least one guide pin (32).

[0084] Item 2. The screw blade system (2) according to Item 1, wherein the helical screw blade (21) and the at least one wear-resistant lining element (22) have a set of through bolt holes (31, 41) arranged along a first line (L), and wherein the at least one guide pin (32) and the at least one guide hole (42) are radially displaced about the first line (L).

[0085] Item 3. The screw blade system (2) according to Item 1 or Item 2, wherein the guiding system includes at least two guide pins (32) and at least two guide holes (42), and the at least two guide pins (32) and the at least two guide holes (42) are disposed on opposite sides of the first line (L).

[0086] Item 4. The screw blade system (2) according to Item 3, wherein the at least two guide pins (32) and the at least two guide holes (42) are displaced along the helical extension (H) of the helical screw blade (21) and the at least one wear-resistant lining element (22).

[0087] Item 5. The screw blade system (2) according to any one of items 1-4, wherein the at least one guide pin (32) is configured to be removable from one of the helical screw blade (21) and the wear-resistant liner element (22).

[0088] Item 6. The screw blade system (2) according to any one of items 1-5, wherein the at least one guide pin (32) is adapted to be disposed on at least one wear-resistant lining element (22), and the at least one guide hole (42) is disposed on the helical screw blade (21).

[0089] Item 7. The screw blade system (2) according to Item 6, wherein the at least one wear-resistant lining element (22) includes at least one insert (33, 33'), and wherein the at least one guide pin (32) is configured to engage the at least one insert (33, 33') by interlocking.

[0090] Item 8. The screw blade system (2) according to Item 7, wherein the at least one insert (33') is disposed in the through channel (35), and wherein the at least one insert (33') further includes a bore (36) configured to receive and engage the lug or protective plug (37).

[0091] Item 9. The screw blade system (2) according to Item 8, wherein the at least one wear-resistant lining element (22) includes a protrusion (39) on a surface adapted to face away from the helical screw blade (21), the protrusion at least partially surrounding the borehole (36).

[0092] Item 10. The screw blade system (2) according to Item 9, wherein, as seen along the leading edge of the at least one wear-resistant lining element (22), the protrusion (39) at least partially surrounds the borehole (36).

[0093] Item 11. A vertical grinding machine (1), wherein the vertical grinding machine (1) includes a screw blade system according to any one of items 1-10.

[0094] Item 12. A replacement kit for a wear-resistant lining element (22) of a screw blade system (2) in a vertical grinding mill (1), wherein the replacement kit includes a wear-resistant lining element (22) and at least two guide pins (32) adapted to be disposed on the wear-resistant lining element (22).

[0095] Item 13. A replacement kit for the wear-resistant lining element (22) according to Item 12, wherein the wear-resistant lining element (22) has a set of through bolt holes (31) arranged along a first line (L), and wherein the at least two guide pins (32) are adapted to be radially displaced and arranged on opposite sides of the first line (L).

[0096] Item 14. A replacement kit for the wear-resistant lining element (22) according to Item 12 or Item 13, wherein the at least two guide pins (32) are displaced along the helical extension (H) of the wear-resistant lining element (22).

[0097] Item 15. A replacement kit for the abrasion lining element (22) according to any one of items 12-14, wherein the abrasion lining element (22) includes at least two inserts (33, 33'), and wherein the at least two guide pins (32) are configured to engage the at least two inserts (33, 33') by interlocking.

[0098] Item 16. A replacement kit for the wear-resistant lining element (22) according to any one of items 12-15, wherein at least one insert (33') is disposed in a through channel (35), and wherein the at least one insert (33') further includes a drill hole (36) configured for receiving and engaging a lug or protective plug (37).

[0099] Item 17. A replacement kit for the wear-resistant lining element (22) according to Item 16, wherein the wear-resistant lining element (22) includes a protrusion (39) as seen along the leading edge of the wear-resistant lining element (22), the protrusion at least partially surrounding the borehole (36).

Claims

1. A screw blade system (2) comprising a helical screw blade (21) and at least one wear-resistant lining element (22), wherein, The screw blade system (2) further includes a guiding system, which includes: At least one guide pin (32) is configured to be disposed on the at least one wear-resistant lining element (22), and At least one guide hole (42) is provided on the helical screw blade (21), the at least one guide hole (42) being configured to receive the at least one guide pin (32). The at least one wear-resistant lining element (22) includes at least one insert (33, 33'), and the at least one guide pin (32) is configured to engage the at least one insert (33, 33') by interlocking. The at least one insert (33') is disposed in the through channel (35), and the at least one insert (33') further includes a drill hole (36) configured to receive and engage a lug or protective plug (37).

2. The screw blade system (2) according to claim 1, wherein, The helical screw blade (21) and the at least one wear-resistant lining element (22) have a set of through bolt holes (31, 41) arranged along a first line (L), wherein the at least one guide pin (32) and the at least one guide hole (42) are radially displaced about the first line (L).

3. The screw blade system (2) according to claim 2, wherein, The guiding system includes at least two guide pins (32) and at least two guide holes (42), and the at least two guide pins (32) and the at least two guide holes (42) are disposed on opposite sides of the first line (L).

4. The screw blade system (2) according to claim 3, wherein, The at least two guide pins (32) and the at least two guide holes (42) are displaced along the helical extension (H) of the helical screw blade (21) and the at least one wear-resistant lining element (22).

5. The screw blade system (2) according to any one of the preceding claims, wherein, The at least one guide pin (32) is configured to be removable from either the helical screw blade (21) or the wear-resistant lining element (22).

6. The screw blade system (2) according to claim 1, wherein, The at least one wear-resistant lining element (22) includes a protrusion (39) on a surface (38) configured to face away from the helical screw blade (21), the protrusion at least partially surrounding the borehole (36).

7. The screw blade system (2) according to claim 6, wherein, Viewed along the leading edge of the at least one wear-resistant lining element (22), the protrusion (39) at least partially surrounds the borehole (36).

8. A vertical grinding machine (1), wherein, The vertical grinding machine (1) includes a screw blade system according to any one of claims 1-7.

9. A replacement kit for a wear-resistant lining element (22) of a screw blade system (2) in a vertical grinding mill (1), wherein, The replacement kit includes a wear-resistant lining element (22) and at least two guide pins (32) configured to be disposed on the wear-resistant lining element (22). The wear-resistant lining element (22) includes at least two inserts (33, 33'), and the at least two guide pins (32) are configured to engage the at least two inserts (33, 33') by interlocking. At least one insert (33') is disposed in the through channel (35), and the at least one insert (33') further includes a drill hole (36) configured to receive and engage a lug or protective plug (37).

10. A replacement kit for the wear-resistant lining element (22) according to claim 9, wherein, The wear-resistant lining element (22) has a set of through bolt holes (31) arranged along a first line (L), and wherein the at least two guide pins (32) are configured to be radially displaced on opposite sides of the first line (L).

11. A replacement kit for the wear-resistant lining element (22) according to claim 9 or claim 10, wherein, The at least two guide pins (32) are displaced along the spiral extension (H) of the wear-resistant lining element (22).

12. A replacement kit for the wear-resistant lining element (22) according to claim 9, wherein, The wear-resistant lining element (22) includes a protrusion (39) that, when viewed along the leading edge of the wear-resistant lining element (22), at least partially surrounds the borehole (36).

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