Shot blasting machine with improved lining plate system

Abstract

A shot blasting machine (100) comprising a liner system (200, 201) arranged to protect the machine in use, the shot blasting machine (100) comprising: a shot blasting wheel (910) comprised in a shot blasting chamber (160) defined by the liner system (200, 201); a lining plate system comprising: a rear wear plate (260) and a front wear plate (270) integrally formed with a body of a shot blasting machine (100) and extending in a plane transverse to an axis of rotation of a shot blasting wheel (910), where each wear plate has a respective peripheral edge (410, 420); at least one top liner (210) and at least one side liner (220) arranged to sealingly engage peripheral edges of the rear wear plate (260) and the front wear plate (270); and the shot blasting machine comprises a plurality of pressing elements (610, 620, 630) arranged to press (F) the at least one top lining plate (210) and the at least one side lining plate (220) against the peripheral edges of the rear wear plate (260) and the front wear plate (270).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to construction equipment for treating hard surfaces such as concrete, asphalt, steel and stone floors. Improvements to shot blasters and backing plate systems for use with shot blasters are disclosed. BACKGROUND

[0002] It is sometimes desirable to remove an upper layer of a hard surface, for example a paint layer on a concrete floor, for example in a preparation operation in which the surface is to be refurbished by adding new coating material.

[0003] Shot blasting is a process for refurbishing hard floor surfaces. A shot blaster throws a large quantity of steel shots at very high speed by centrifugal force to the surface to be treated. After the steel abrasives have impacted the surface, the shot blaster recirculates the media. Dust and contaminants can be separated, for example by an air wash separator, and extracted by a dust extractor. This makes the shot blasting process almost dust-free, which is an advantage. The process is comparable to sand blasting, but due to the weight and speed of the metal beads, the process provides a more forceful action. Since the steel shots are recycled, it is also a cost-effective way of removing an upper layer from a hard surface, as a rule.

[0004] Shot blasters themselves are subject to wear due to the shot blasting and dust generated in use. It is desirable to reduce this wear. US2002 / 0112515A1, EP0084430, GB1037811 and WO 2017 / 092806A1 all relate to shot blasters having a backing plate system arranged to protect the machine from wear caused by itself. However, further improvements are needed. SUMMARY

[0005] The object of this disclosure is to provide an improved shot blasting machine. This object is achieved at least in part by a shot blasting machine including a liner system arranged to protect the machine in use. The shot blasting machine includes a shot blasting wheel housed in a shot blasting chamber defined by the liner system. The liner system includes a rear wear plate and a front wear plate extending in a plane transverse to the axis of rotation of the shot blasting wheel, wherein each wear plate has a corresponding peripheral edge, and wherein at least the rear wear plate is fixed to or integrally formed with the body of the shot blasting machine. The liner system also includes at least one top liner and at least one side liner arranged to sealably engage the peripheral edges of the rear and front wear plates. A plurality of pressing elements are arranged to press the at least one top liner and the at least one side liner against the peripheral edges of the rear and front wear plates. Thus, a liner system with minimized clearance is provided, which ensures effective protection against wear caused by abrasive media and dust particles generated during the use of the shot blasting machine. Therefore, it effectively protects the inner wall of the shot blasting chamber and extends the service life of the shot blasting machine, which is an advantage. The liner system is easy to install and maintain; that is, the liner system components are easy to replace when worn.

[0006] The thickness of the top and / or side liners may optionally exceed that of the rear and front wear plates. Typically, most wear occurs on the liner sections, so increasing the thickness of the liner sections is advantageous, at least when the overall weight of the machine and / or material cost are concerns, rather than increasing the thickness of the wear plates extending transversely to the axis of rotation of one or more shot blasting wheels, which is generally the case.

[0007] At least a portion of the peripheral edge of the rear wear plate and at least a portion of the peripheral edge of the front wear plate may optionally be aligned in a direction perpendicular to the axis of rotation of the shot blasting wheel. This provides a stable support for the liner components to be pressed against, which is an advantage.

[0008] The front wear plate can be fixed to or integrally formed with the shot blasting chamber access cover of the shot blasting machine. This allows the shot blasting chamber access cover to be manufactured relatively large, improving access to the shot blasting chamber. If the front wear plate needs to be replaced due to wear, the entire shot blasting chamber cover can also be easily replaced.

[0009] The lining system can also comprise a top chamber lining, a bottom chamber lining and two side chamber linings arranged to delimit the outlet portion of the shot blasting chamber. The two side chamber linings can be arranged to sealingly engage the peripheral edges of the top chamber lining and the bottom chamber lining, wherein at least two pressing elements are arranged to press the two side chamber linings against the peripheral edges of the top chamber lining and the bottom chamber lining. In this way, the outlet portion of the shot blasting chamber is also effectively protected in a maintenance friendly manner. The top chamber lining and the bottom chamber lining can be held in place relative to the shot blasting machine body by fastening elements such as bolts attached to the machine body to improve the mechanical integrity of the lining system at the outlet portion of the shot blasting chamber.

[0010] According to some aspects, the at least one pressing element comprises a pair of threaded rods extending from the shot blasting machine body, wherein the plunger on the central piece of the pressing element is arranged to be pushed into an aperture formed in the machine body by a nut engaging the threaded rods. The plunger can be made with a larger cross-sectional size compared to a bolt or the like, which is an advantage since the pressing force on the linings is better distributed. The pressing force is also improved since a pair of nuts is used on the respective threaded rods instead of a single nut.

[0011] The at least one top lining advantageously extends beyond the shot blasting wheel in the direction of entry of the shot blasting machine, i.e. downwards into the shot blasting chamber by a distance. In this way, the angle of impact from the shot blasting is greater, which reduces the wear on the side linings. In this case, the top lining of the lining system is not symmetrical about the centre of the curved portion of the top lining.

[0012] According to some aspects, the front wear plate comprises at least one stiffening element extending in the direction of the rotational axis of the shot blasting wheel and arranged along at least a portion of the peripheral edge of the front wear plate. This stiffening element improves the support provided by the peripheral edge to the lining part pressed against it.

[0013] A sealing compound, such as silicone, can be applied between the lining parts and / or between the lining parts and the wear plates to further improve the integrity of the inner walls of the shot blasting chamber. Various sealing compounds can be used for this purpose, but it is an advantage if the sealing compound is an elastic compound that can absorb some movement between the parts of the lining system, which otherwise can result in an increase in the size of the gap between the parts.

[0014] A shot blasting machine and a method for using a shot blasting machine are also disclosed herein. The machine and method are associated with the advantages mentioned above.

[0015] Generally, unless otherwise defined herein, all terms used in the claims are to be interpreted in accordance with their ordinary meaning in the technical field. All references to "a" or "an" element, device, article, means, step, etc., are to be interpreted openly to mean "at least one," and do not exclude the plural. All steps described herein are to be interpreted as open to the possibility that, where applicable, the steps can be performed in an order other than that which is described. Other features and advantages of the present application will become apparent from the following detailed description, taken in conjunction with the accompanying drawings. Those skilled in the art will recognize that the present application can be practiced with modifications to the described embodiments, and that the present application can be practiced with different features, or in different combinations than those described herein. The present application is not limited to the described embodiments, but rather extends to any patentable subject matter that would reasonably fall within the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present disclosure will now be described in more detail with reference to the accompanying drawings, in which

[0017] Figure 1 An exemplary shot blasting machine is shown;

[0018] Figures 2A-2B Two exemplary liner systems are shown;

[0019] Figure 3 A liner is schematically shown pressed against a support edge;

[0020] Figures 4A-4B Details of a shot blasting machine liner system are shown;

[0021] Figure 5 A main part of a shot blasting machine is shown;

[0022] Figures 6A-6B Details of a shot blasting machine are shown;

[0023] Figures 7A-7B Details of a shot blasting machine are shown;

[0024] Figure 8 A pressing element for pressing on a liner part is shown;

[0025] Figure 9 The geometry of a shot blasting chamber is shown;

[0026] Figures 10A-10B An exemplary shot blasting machine fixed wear plate is shown;

[0027] Figures 11A-11B Another exemplary fixed wear plate is shown; and

[0028] Figure 12 A flow chart showing a method is shown. DETAILED DESCRIPTION

[0029] The present application now will be described more fully hereinafter with reference to the accompanying drawings, in which some aspects of the application are shown. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like numbers refer to like elements throughout the description.

[0030] It should be understood that the application is not limited to the embodiments described herein and shown in the drawings; rather, persons skilled in the art will recognize that many modifications and variations are possible without departing from the scope of the appended claims.

[0031] Figure 1 An exemplary shot blasting machine 100 is shown. This machine can be used to remove the upper layer of a surface 120, such as a concrete, steel or stone floor. The machine 100 accelerates small metal balls, known as "shot" or steel abrasives, along an entry direction 110 towards the surface 120 to be treated by means of a shot wheel. The impact of the shot on the surface 120 has an abrasive effect. The used shot is extracted via an outlet duct 130 back to a separator system 140, where the shot is recirculated, and the particulate matter, e.g. by means of a dedicated dust extractor, is extracted 150 from the machine.

[0032] The internal volume in which the shot is accelerated towards the surface is known as the shot blast chamber 160. The shot blast chamber has an entry portion, where the shot is accelerated towards the surface 120, and an exit portion, where the used shot is collected for recirculation. The lid can be opened to inspect the shot blast chamber and the components therein.

[0033] The steel shot not only abrades the surface 120, but also the machine 100, in particular the interior of the shot blast chamber 160, where the shot has high kinetic energy. This leads to wear of the machine, which is of course undesirable. Further wear of the interior of the shot blast chamber is caused by the high kinetic energy dust particles generated during use of the machine. To protect the interior of the shot blasting machine 100 from this self-inflicted wear, a liner system is typically used, which comprises a plurality of protective components that can be replaced when worn.

[0034] Figure 2A and Figure 2BExemplary liner systems 200, 201 of the present disclosure are shown. The left-hand liner system 200 is for a single blast wheel machine, while the right-hand system 201 is for a double blast wheel machine. Blast machines use abrasive media to abrade a surface 120. As mentioned above, the abrasive media is typically steel shot, but other forms of abrasive media can be used, such as steel wire and various hard particles. Single blast wheel machines use only one blast wheel to accelerate the abrasive media, while double blast wheel machines use two counter-rotating blast wheels to concentrate the abrasive media on a section of the surface to be treated. The side of the blast wheel from which the blast wheel's shot is ejected will be referred to herein as the front side of the blast wheel, while the other side of the blast wheel will be referred to herein as the back side of the blast wheel. Figure 9 The front and back sides of the blast wheel are indicated. The liner systems discussed herein are suitable for both single blast wheel machines and double blast wheel machines. Figures 2A-2B Exemplary liner systems 200, 201 in a single blast wheel machine include a replaceable top liner 210 and side liners 220 in the inlet portion of the blast chamber 160. According to a preferred embodiment, the top liner 210 extends further down in the blast chamber on the front side of the blast wheel than on the back side of the blast wheel. The ends of the top liner 210 are shown in Figure 2A are 211 and 212, and in Figure 2B the same asymmetrical principle is seen. Thus, the front side liners are shorter than the back side liners. The double blast wheel machine liner system 201 also has a center liner 280 that supports the top liner 210, as shown in Figure 2B The center liner 280 is typically bolted to the machine body, for example, by bolts through the back wear plate and by bolts through the front wear plate.

[0035] The outlet portion of the blast chamber 160 has a top plenum liner 230, a bottom plenum liner 240, and two side plenum liners 250, as shown in Figure 2A and Figure 2B The plenum liners 230, 240, 250 are preferably all replaceable, i.e., not permanently attached to or integrally formed with the machine body.

[0036] In addition to the replaceable liner components 210, 220, 230, 240, 250, there are also two wear plates. A back wear plate 260 is disposed on the side of the drive shaft(s) of the blast wheel(s), and a front wear plate 270 is disposed under the blast chamber access covers 601, 602 (the front wear plate 270 is not shown in Figure 2A and Figure 2B but is indicated in Figures 10A-10B and Figures 11A-11B The blast chamber access covers are considered herein to be part of the machine body.

[0037] Replaceable liner components are components that can be removed from the machine without undue burden. Liner components that are held in place by a press mechanism that can be released by reducing the pressure to release and remove the liner component in a convenient manner are replaceable. Liner components that are held in place by releasable fastening elements, such as bolts or the like, are also replaceable. Liner components that have been welded or otherwise permanently attached to a portion of the machine body are by definition not replaceable liner components.

[0038] It has been recognized that gaps between liner components and / or between liner components and fixed wear plates are detrimental to the performance of the liner system, because abrasive projectiles and dust particles from the surface due to the use of the machine can enter the gaps, whereby the wear of the liner at those locations becomes more pronounced.

[0039] To improve the performance of the liner system of the shot blast machine 100, it has been recognized that the combination of fixed front and rear wear plates and movable liners that are pressed against the peripheral edges of the fixed front and rear wear plates provides a liner system that has reduced gaps and thus increased wear resistance when installed in a shot blast machine. The front and rear wear plates are fixed to or integrally formed with the shot blast machine body, i.e. are fixed during installation of the liner components, and thus provide a stable support against which the top and side liners 210, 220 can be pressed. The front and rear wear plates are preferably integrally formed with the machine body, but they can also be bolted to the machine body or otherwise fixedly attached to the machine body. It is important here that the wear plates are fixedly attached to the machine body, while the liner components are loose and movable when they are pressed against the peripheral edges of the wear plates. In this regard, it is also noted that, as shown in Figure 7A Since, according to some aspects, the top and bottom chamber liners 230, 240 are fixed to the machine body by bolts 710, 720, the top and bottom chamber liners can also be referred to as wear plates.

[0040] Figure 3 The general principle 300 of pressing a replaceable liner 310 against the edges of fixed front and rear wear plates 320, 330 by a pressing force F is shown. The liner 310 seals the shot blast chamber 340 by sealingly engaging the edges of the fixed front and rear wear plates 320, 330. In this way, the gap 350 between the replaceable liner 310 and the fixed wear plates 320, 330 is reduced to a minimum. It is particularly advantageous that the sealing interface between the fixed wear plates 260, 270 and the liners is continuous along the complete peripheral edge of the wear plates without discontinuities, such as the "wear dams" described in prior art document EP0084430.

[0041] To improve the sealing between the liner parts and between the liner parts and the wear plates, a silicon or some other suitable sealing compound can be distributed in the gap when the liner system is installed. Preferably an elastic sealing compound is used, which can absorb some movement of the liner system parts due to expansion caused by e.g. vibrations and temperature increase.

[0042] Figure 4A Some details of the liner system in the proposed single-wheel shot-blasting machine are shown 400. From the direction of the opening in the shot-blasting chamber 160, i.e. the position where the metal shots hit the surface to be treated, the rear wear plate 260 can be seen. Figure 4B is a close-up view of the interface between the side liner 220 and the rear wear plate 260. The rear wear plate 260 is preferably integrally formed with the machine body and is thus not replaceable, while the side liner is replaceable as it is held in place only by the pressure exerted on it and the resistance of the peripheral edge 410 of the rear wear plate 260. As mentioned above, the rear wear plate 260 is also fixed to the machine body by bolting it to the machine body. The sealing between the peripheral edge 410 and the liner can be further improved by adding a sealing compound such as silicone etc. The side liner 220 is arranged to sealingly engage the peripheral edge 410 of the rear wear plate 260, i.e. it has a shape that matches the peripheral edge of the wear plate, and the gap G formed between the rear wear plate 260 and the side liner 220 is thus very small, enabling better resistance to wear caused by the metal shots during use of the shot-blasting machine 100. If a sealing compound is applied during installation of the liner system, the sealing at the gap G formed between the rear wear plate 260 and the side liner 220 can also be improved. A similar sealing is provided by the same side liner 220 against the front wear plate 270 (not shown in Figure 4A and Figure 4B ).

[0043] In the embodiment of Figure 4B it should also be noted that the thickness of the side liner 220 exceeds the thickness of the rear wear plate 260. This is generally an advantageous design, as the liner parts are subjected to more wear caused by the abrasive material due to the direction of the pellets thrown from the shot-blasting wheel in use, compared to the front and rear wear plates. The thickness of the different liner elements is generally advantageously made thicker than the front wear plate 260 and the rear wear plate 270.

[0044] Figure 5 An exemplary shape of the rear wear plate 260 is shown. The wear plate 260 has a shape that is adapted to the shape of the side liner 220, i.e. the shape of the side liner 220 is adapted to the shape of the rear wear plate 260. Figure 5The perimeter edge 410 in FIG. 6 is indicated by the dashed line, which is arcuate 510 near the shot wheel orifice (an opening in the wear plate through which the drive shaft of the shot wheel extends), then extends in a rectangular shape 520 down toward the opening in the shot blast chamber and away from the shot wheel orifice. The direction of rotation of the shot wheel is indicated by the arrow R. The shape of the front wear plate 270 is identical to the shape of the rear wear plate at least when the top and side wear plates interface with the wear plates to seal the perimeter edge portion of the shot blast chamber.

[0045] Figure 5 The striped arrows in FIG. 6 show locations suitable for applying pressure to the replaceable wear plate elements, which in this embodiment are the top wear plate and the two side wear plates. These pressures F push the wear plates against the perimeter edges of the front and rear wear plates, effectively sealing the shot blast chamber and minimizing the gap between the wear plates and the wear plates.

[0046] In summary, disclosed herein is a shot blast machine 100 that includes a wear plate system 200, 201 arranged to protect the machine from high kinetic energy abrasives and dust particles in use, i.e., when the abrasives are propelled by one or more shot wheels against a surface to be treated, such as a concrete floor, a steel floor, a stone floor, etc. The shot blast machine 100 includes shot wheels 910 contained in a shot blast chamber 160 bounded by the wear plate system 200, 201. A drive shaft extends from a power source, such as an electric motor, into the shot blast chamber to power the shot wheels. An orifice for feeding a controlled amount of metal shots into the shot blast chamber in the vicinity of the shot wheels is also provided.

[0047] The wear plate system that covers the interior walls of the shot blast chamber to protect them from wear includes a rear wear plate 260 and a front wear plate 270. These wear plates are fixed to or integrally formed with the machine body (including the shot blast chamber access cover) and extend in a plane transverse to the rotational axis of the shot wheels 910. In the embodiment shown in the drawings, the front wear plate is fixedly attached to the interior of the shot blast chamber access cover, which also includes one or more shot feed orifices through which abrasives are fed into the shot blast chamber. Since the cover forms part of the shot blast machine, being part of the cover is considered to be integrally formed with the shot blast machine.

[0048] According to some aspects, at least a portion of the perimeter edges 410, 420 of the rear wear plate 260 and the front wear plate 270 are aligned in a direction perpendicular to the rotational axis of the shot wheels 910. According to some other aspects, the front wear plate 270 is fixed to or integrally formed with the shot blast chamber access cover 601, 602 of the shot blast machine 100.

[0049] Each wear plate has a respective peripheral edge 410, 420. The front and rear wear plates are fixedly attached to the machine body and are therefore both stable. The peripheral edges of the wear plates thus provide a stable support against the pressure generated by the liner parts pressing against them. The peripheral edges of the wear plates extend around the wear plates. The thickness of the wear plates is the height of their peripheral edges.

[0050] The front and rear wear plates can both be formed in different ways and still support the liner parts when sealingly engaging the peripheral edges of the wear plates 260, 270. For example, the peripheral edges 410, 420 of the rear wear plate 260 and the front wear plate 270 that are in contact with the top liner 210 and the at least one side liner 220 preferably, but not necessarily, have the same shape when viewed along the normal to the plane in which the wear plates extend. In the embodiment shown in the figures, both the front wear plate 260 and the rear wear plate 270 have a U-shaped peripheral edge with parallel legs. In a preferred embodiment, the wear plates extend in parallel planes and the peripheral edges of the front and rear wear plates overlap each other when viewed from a direction perpendicular to the parallel extension planes of the wear plates.

[0051] Any of the rear wear plate 260 and / or the front wear plate 270 can also be shaped as a horseshoe, have a cut-out portion between the peripheral edges 410, 420, or have a portion of reduced thickness between the peripheral edges 410, 420.

[0052] The rear wear plate 260 and / or the front wear plate 270 can also be formed from multiple segments, i.e. the wear plates can be assembled from multiple parts, although it is preferred that the wear plates are integrally formed as a single piece of material. The wear plates need not be of the same material throughput. Different materials can be used at the centre, for example materials of different hardness.

[0053] The at least one top liner 210 and the at least one side liner 220 are arranged to sealingly engage the peripheral edges of the rear wear plate 260 and the front wear plate 270, and the plurality of pressing elements 610, 620, 630 are arranged to press (with force F) the at least one top liner 210 and the at least one side liner 220 against the peripheral edges of the rear wear plate 260 and the front wear plate 270. The sealing engagement of the components of this pressure and liner system provides a gap-free protective covering of the interior of the shot blasting chamber, which is an advantage. Since the replaceable liner parts are held in place only by the pressure exerted by the pressing elements 619, 620, 630, it is easy to replace the replaceable liner parts. The front and rear wear plates are not so easily replaceable, but this is irrelevant since the wear plates do not wear significantly due to the abrasive material.

[0054] Figure 6A and Figure 6BA shot blast chamber of a single wheel shot blast machine and a double wheel shot blast machine is shown, wherein the shot blast chamber service covers 601, 602 are in place.

[0055] The liner system 200, 201 can also comprise a top plenum liner 230, a bottom plenum liner 240 and two side plenum liners 250 arranged to define an outlet portion of the shot blast chamber 160, e.g. as shown in Figure 2A and Figure 2B and Figure 6A and Figure 6B The two side plenum liners 250 are arranged to sealingly engage the peripheral edges of the top plenum liner 230 and the bottom plenum liner 240, and at least two pressing elements 640 are arranged to press the two side plenum liners 250 against the peripheral edges of the top plenum liner 230 and the bottom plenum liner 240. In this way, the outlet portion of the shot blast chamber (sometimes referred to as the plenum portion of the shot blast chamber) is protected from wear by a tight liner system with minimal gaps between the liners. The different plenum liners 230, 240, 250 can be easily exchanged by simply releasing the pressure applied by the pressing elements 640, and sometimes also by removing bolts from the machine body, whereupon the liner parts can be removed.

[0056] Figure 7A and Figure 7B An exemplary arrangement of pressing elements 610, 620, 630, 640 is shown.

[0057] In order to secure the top plenum liner 230 and the bottom plenum liner 240 in a more stable manner, they can optionally be held in place relative to the shot blast machine body by fastening elements 710, 720, e.g. threaded fastening elements, i.e. bolts, in Figure 7A .

[0058] Figure 8 An exemplary pressing element 800 is shown in more detail. This exemplary pressing element 800 comprises a pair of threaded rods 830 extending from the shot blast machine body. A plunger 810 on a central piece 840 is arranged to be pushed into an aperture 820 formed in the machine body by engaging the threaded rods 830 with a nut 860. Figure 8 Optional washers 850 are also shown in . These washers 850 are preferably locking washers or spring washers. The plunger 810 then engages a liner part on the other side of the aperture 820. By tightening the nut 860, pressure is applied to the central piece 840, which is transferred to the liner part behind the aperture via the plunger 810. The plunger exerts a more controlled amount of pressure over a larger area on the liner part compared to the case where only a bolt is used. More pressure can be exerted due to the presence of two rods compared to using a single bolt as a pressure element. It should be noted, however, that the liner system concepts discussed herein can also be used with other types of pressing elements, including conventional bolts that are screwed into the machine body.

[0059] Figure 9 A portion 900 of the internal blasting chamber 160 in use is schematically illustrated. The blasting wheel 910 is rotating at high speed to project the metal shots towards the surface to be treated. The rotation of the blasting wheel is indicated by the dashed arrow R. Some exemplary shot trajectories are illustrated as straight dashed arrows. Two interfaces between the top and side liners are illustrated. A first interface Gl is located behind the blasting wheel, i.e. opposite the side of the blasting wheel from which the shots are ejected. Another interface G2 extends further down in the blasting chamber, closer to the floor, and further away from the rotational axis of the blasting wheel. This means that the shots hit this interface G2 at a smaller acute angle a relative to the liner surface, which reduces the wear on the interface G2 between the top liner 210 and the side liner 220. In other words, in this embodiment, the top liner 210 extends beyond the blasting wheel 910 in the direction of entry 110 of the blasting machine 100, to a point further away from the centre of rotation of the blasting wheel, downstream of the blasting wheel 910. In this embodiment, the top liner 210 of the liner system is also asymmetric about the centre of the curved portion of the top liner.

[0060] If the reinforcing elements 275 are bolted or otherwise attached to the front wear plate, the resistance of the internal wall of the blasting chamber to wear from the metal abrasive can be further enhanced. These reinforcing elements 275 strengthen the liner system and provide a more resistant-to-warping liner system, which is an advantage. Figures 10A-10B and Figures 11A-11B An exemplary reinforcing element 275 is illustrated. The front wear plate 270 comprises herein at least one reinforcing element 275 which extends in the direction of the rotational axis of the blasting wheel and which is arranged along at least a portion of the peripheral edge 420 of the front wear plate 270.

[0061] Figure 12 is a flow chart illustrating a method for installing a liner system 200, 201 in a blasting machine 100 to protect the machine in use. The blasting machine 100 comprises a blasting wheel 910 contained in a blasting chamber 160 delimited by the liner system 200, 201 as described above. The machine further comprises a rear wear plate 260 and a front wear plate 270 as described above, which extend in a plane transverse to the rotational axis of the blasting wheel 910, wherein each wear plate has a respective peripheral edge 410, 420, and wherein at least the rear wear plate 260 is fixed to or integral with the main body of the blasting machine 100. The method comprises:

[0062] an installation step S1 of installing at least one top liner 210 and at least one side liner 220 to sealingly engage the peripheral edges of the rear wear plate 260 and the front wear plate 270, and

[0063] Pressing step S3: pressing at least one top lining plate 210 and at least one side lining plate 220 against the peripheral edges of the rear wear plate 260 and the front wear plate 270 by means of the plurality of pressing elements 610, 620, 630 on the shot blasting machine 100.

[0064] According to some aspects, the method further comprises an applying step S2: applying a sealing compound between the at least one top lining plate 210 and the at least one side lining plate 220, and / or between the lining plates 210, 220 and the peripheral edges of the wear plates 260, 270.

Claims

1. A shot blasting machine (100) comprising a liner system (200, 201) arranged to protect the shot blasting machine during use. The shot blasting machine (100) includes: The shot blasting wheel (910) is located in the shot blasting chamber (160) defined by the liner system (200, 201). The liner system includes: The rear wear plate (260) and the front wear plate (270) extend in a plane transverse to the axis of rotation of the shot blasting wheel (910), wherein each wear plate has a corresponding peripheral edge (410, 420), and wherein at least the rear wear plate (260) is fixed to the body of the shot blasting machine (100) or integrally formed with the body of the shot blasting machine; At least one top liner (210) and at least one side liner (220), The peripheral edges of the rear wear plate (260) and the front wear plate (270) are arranged to sealably join; and Multiple pressing elements (610, 620, 630) are arranged to press (F) the at least one top liner (210) and the at least one side liner (220) against the peripheral edges of the rear wear plate (260) and the front wear plate (270).

2. The shot blasting machine (100) according to claim 1, wherein, At least a portion of the peripheral edges (410, 420) of the rear wear plate (260) and the front wear plate (270) are aligned in a direction perpendicular to the axis of rotation of the shot blasting wheel (910).

3. The shot blasting machine (100) according to claim 1 or 2, wherein, The front wear-resistant plate (270) is fixed to the shot blasting chamber inspection cover of the shot blasting machine (100) or is integrally formed with the shot blasting chamber inspection cover.

4. The shot blasting machine (100) according to any one of the preceding claims, wherein, The liner system (200, 201) also includes a top cavity liner (230), a bottom cavity liner (240), and two side cavity liners (250), which are arranged to define the outlet portion of the shot blasting chamber (160). The two side cavity liners (250) are arranged to sealably engage the peripheral edges of the top cavity liner (230) and the bottom cavity liner (240), and at least two pressing elements (640) are arranged to press (F) the two side cavity liners (250) against the peripheral edges of the top cavity liner (230) and the bottom cavity liner (240).

5. The shot blasting machine (100) according to claim 4, wherein, The top cavity liner (230) and the bottom cavity liner (240) are held in place relative to the body of the shot blasting machine by fastening elements (710, 720).

6. The shot blasting machine (100) according to any one of the preceding claims, wherein, At least one of the pressing elements (610, 620, 630, 640, 800) includes a pair of screws (830) extending from the body of the shot blasting machine, wherein a plunger (810) on the central member (840) of the pressing element is arranged to be pushed into an orifice (820) formed in the body of the shot blasting machine by engaging the screws (830) with a nut (860).

7. The shot blasting machine (100) according to any one of the preceding claims, wherein, At least one of the pressing elements (610, 620, 630, 640, 800) is arranged to press against the gap (G2) between the two liner components (210, 220) of the liner system.

8. The shot blasting machine (100) according to any one of the preceding claims, wherein, The top liner (210) extends beyond the shot blasting wheel (910) in the entry direction (110) of the shot blasting machine (100).

9. The shot blasting machine (100) according to any one of the preceding claims, wherein, The top liner (210) of the liner system is asymmetrical about the center of the curved portion of the top liner.

10. The shot blasting machine (100) according to any one of the preceding claims, wherein, The front wear plate (270) includes at least one reinforcing element (275) that extends in the direction of the rotation axis of the shot blasting wheel and is arranged along at least a portion of the peripheral edge (420) of the front wear plate (270).

11. The shot blasting machine (100) according to any one of the preceding claims, wherein, The thickness of the top liner (210) and / or the thickness of the side liner (220) is greater than the thickness of the rear wear plate (260) and the thickness of the front wear plate (270).

12. The shot blasting machine (100) according to any one of the preceding claims, wherein, The shot blasting machine is a double shot blasting wheel machine, wherein the liner system (201) further includes a central liner (280) arranged to support a first top liner and a second top liner (210).

13. The shot blasting machine (100) according to any one of the preceding claims, wherein, The interface between the two liner components of the liner system and / or the interface between the liner component and the wear plate includes a sealing compound.

14. The shot blasting machine (100) according to any one of the preceding claims, wherein, The peripheral edges (410, 420) of the rear wear plate (260) and the front wear plate (270) that contact the top liner (210) and the at least one side liner (220) have the same shape when viewed along the normal to the extended plane of the wear plate.

15. The shot blasting machine (100) according to any one of the preceding claims, wherein, The peripheral edges (410, 420) of the rear wear plate (260) and the front wear plate (270) that contact the top liner (210) and the at least one side liner (220) are U-shaped, wherein the legs of each U-shape are parallel.

16. The shot blasting machine (100) according to any one of the preceding claims, wherein, The rear wear plate (260) and / or the front wear plate (270) are shaped like horseshoes and have cut-out portions between the peripheral edges (410, 420) or portions with reduced thickness between the peripheral edges (410, 420).

17. The shot blasting machine (100) according to any one of the preceding claims, wherein, The rear wear plate (260) and / or the front wear plate (270) are formed from multiple segments.

18. A method for installing a liner system (200, 201) in a shot blasting machine (100) to protect the shot blasting machine during use. The shot blasting machine (100) includes: A shot blasting wheel (910) is located in a shot blasting chamber (160) defined by the liner system (200, 201); a rear wear plate (260) and a front wear plate (270) extend in a plane transverse to the axis of rotation of the shot blasting wheel (910), wherein each wear plate has a corresponding peripheral edge (410, 420), and wherein at least the rear wear plate (260) is fixed to or integrally formed with the body of the shot blasting machine (100). The method includes: At least one top liner (210) and at least one side liner (220) are installed to sealably engage the peripheral edges (S1) of the rear wear plate (260) and the front wear plate (270), and The at least one top liner (210) and the at least one side liner (220) are pressed against the peripheral edges (S3) of the rear wear plate (260) and the front wear plate (270) by a plurality of pressing elements (610, 620, 630) on the shot blasting machine (100).

19. The method of claim 18, further comprising: A sealing compound (S2) is applied between the at least one top liner (210) and the at least one side liner (220) and / or between the peripheral edge of the wear-resistant plate (260, 270) and the liner (210, 220).

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