Sliding Liner Kit

Abstract

To provide a liner kit which uses a UHMW-PE plastic plate as a liner, allows reversible installation, is easy to install, and has increased fixing strength. [Solution] The liner kit 10(i) comprises a liner 10 made of a plastic plate material containing ultra-high molecular weight polyethylene, which is placed on a plate material B1 that will be the required lining portion of the mating member and cut to fit the shape of the required lining portion; multiple stepped mounting holes formed in the liner, with a larger diameter hole on the front side and a smaller diameter hole on the back side; and a welding bushing 20, which is a metal bushing with an upper flange and has a through hole 23 in the center of the bushing body that is inserted into the mounting holes, and which has a tapered portion 25 in the portion close to the mating member where the inner diameter of the through hole widens toward the mating member.

Description

[Technical Field]

[0001] This invention relates to a liner kit for improving sliding properties, which is in demand for machines that input, discharge, and transport snow, such as snow blowers, excavators, wheel loaders, trucks, and hoppers. [Background technology]

[0002] The shooter part of a snow blower, the bucket and blade parts of a shovel or wheel loader, the bed part of a truck, the feeding part of a hopper, etc. require sliding properties, abrasion resistance, impact resistance, chemical resistance, etc. For this reason, there is a demand for lining treatments in these parts (hereinafter referred to as "parts requiring lining") that create a layer to improve sliding properties, etc.

[0003] A known lining method is to spray paint onto the area requiring lining to improve sliding properties, etc. Although spraying paint is a simple process, it takes several days to several weeks for the paint to dry, which causes the machine to become inoperable during that time. Furthermore, due to the nature of paint, it lacks the lining capabilities in terms of abrasion resistance and impact resistance. For this reason, another method involves attaching a sheet-like liner to the area requiring lining. For example, Patent Documents 1, 2, and 3 disclose a lining method in which a resin or rubber liner is screwed onto the area requiring lining. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 59-40005

[0005] [Patent Document 2] Japanese Patent Application Publication No. 58-166111

[0006] [Patent Document 3] Japanese Utility Model Application Publication No. 2-66499 Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Documents 1 to 3, mounting holes are formed in the liner, and the liner is fixed by screwing it through the mounting holes to a mating member (a portion requiring lining). As a result, when the liner is removed, traces (holes) of the screws are left in the mating member. Since machines such as snow blowers, excavators, wheel loaders, trucks, hoppers, etc. are used for long periods of time with frequent maintenance, irreversible lining treatments that leave screw traces tend not to be preferred.

[0008] Furthermore, if the lining portion is hard, it becomes necessary to form a tap in the mating component for screw fastening, and the positional accuracy of the liner mounting hole and the tap in the mating component is required, making the liner installation work complicated. Furthermore, since liners are consumable items that deteriorate and need to be replaced, there has been a strong demand for a liner kit that is easy to install, especially for machines that experience busy seasons, such as snow blowers.

[0009] Recently, plastic plates containing ultra-high molecular weight polyethylene (UHMW-PE) have become available. Such UHMW-PE plastic plates are known to have high sliding properties, abrasion resistance, impact resistance, chemical resistance, and the like, and are therefore considered suitable for use as liners in the above-mentioned machines. However, when UHMW-PE plastic plates are used as liners, the liner's extremely high sliding properties make them difficult to secure to mating components (they tend to come loose).

[0010] The present invention has been made to solve the above problems, and aims to provide a liner kit that uses a UHMW-PE plastic plate as a liner, allows for reversible installation, is easy to install, and has increased fixing strength. [Means for solving the problem]

[0011] In order to solve the above problems, the liner kit of a first aspect of the present invention comprises a liner made of a plastic plate material containing ultra-high molecular weight polyethylene, which is placed on top of a plate material that will be the lining required portion of a mating member and cut to fit the shape of the lining required portion; multiple stepped mounting holes formed in the liner, with a larger diameter hole on the front side and a smaller diameter hole on the back side; and a welding bushing made of metal with an upper flange and a through hole in the center of the bushing body that is inserted into the mounting holes, and which has a tapered portion in the portion close to the mating member where the inner diameter of the through hole widens toward the mating member.

[0012] In the liner kit of the second aspect, in the first aspect, it is also preferable that the diameter of the flange portion of the welding bushing is formed to be 180% or more and 300% or less of the outer diameter of the bushing body.

[0013] In the liner kit of the third aspect, in the first or second aspect, it is also preferable that the diameter of the flange portion of the welding bushing and the large diameter hole of the liner are approximately the same, the outer diameter of the bushing body of the welding bushing and the small diameter hole of the liner are approximately the same, and the height of the welding bushing and the thickness of the liner are approximately the same.

[0014] In the liner kit of the fourth aspect, in any one of the first to third aspects, it is also preferable that the tapered portion is provided after a counter-tapered portion where the inner diameter of the through hole narrows toward the mating member.

[0015] In the liner kit of the fifth aspect, in any of the first to fourth aspects, it is also preferable that the mounting holes are provided in a plurality at predetermined intervals in the peripheral region of the liner, and that in the inner region inside the peripheral region, the mounting holes are provided at intervals wider than the predetermined intervals.

[0016] In the liner kit of the sixth aspect, in the fifth aspect, in the peripheral region, in a direction perpendicular to the direction of movement of the object moving on the mating member, the mounting holes are preferably arranged at intervals narrower than the specified interval, and the mounting holes are preferably arranged symmetrically with respect to an axis of symmetry set in the same direction as the direction of movement.

[0017] A seventh aspect of the liner kit includes a liner made of a plastic plate material containing ultra-high molecular weight polyethylene, which is placed over a plate material that will be the lining-requiring portion of a mating member and cut to the shape of the lining-requiring portion, a plurality of stepped mounting holes formed in the liner, each having a larger diameter hole on the front side and a smaller diameter hole on the back side, and a welding bushing that is inserted into the mounting holes and is a metal upper-brim bushing that has a through hole in the center of its body and is solid except for the through hole, and that has a reverse tapered portion in the portion adjacent to the mating member where the inner diameter of the through hole tapers toward the mating member. It is also preferable to combine the seventh aspect of the liner kit with any of the second to sixth aspects.

[0018] The liner kit of the eighth aspect includes a liner made of a plastic plate material containing ultra-high molecular weight polyethylene, which is placed on a plate material that will be the lining-requiring portion of a mating member and cut to the shape of the lining-requiring portion, a plurality of stepped mounting holes formed in the liner, each having a larger diameter hole on the front side and a smaller diameter hole on the back side, a disk magnet inserted into the mounting hole and having a diameter roughly matching that of the small diameter hole, and a metal cover that covers the disk magnet and has a diameter roughly matching that of the large diameter hole. It is also preferable to combine the liner kit of the eighth aspect with the liner kit of the fifth or sixth aspect. [Effects of the Invention]

[0019] According to the present invention, a liner kit can be provided that uses a UHMW-PE plastic plate as a liner, allows for reversible installation, is easy to install, and has increased fixing strength. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a liner design diagram showing the liner kit according to the first embodiment of the present invention when it is attached to a bucket B of a backhoe, as an example. [Figure 2] FIG. 2 is a cross-sectional view of the liner kit according to the first embodiment. [Figure 3] FIG. 2 is a plan view of the vicinity of the mounting hole 11 of the liner 10. [Figure 4] FIG. 2 is a vertical cross-sectional view of the welding bushing 20. [Figure 5] FIG. 2 is a cross-sectional view of the liner kit according to the first embodiment after installation. [Figure 6] 10 is a liner kit according to a second embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a liner kit according to a second embodiment attached with screws. [Figure 8] 10 is a liner kit according to a third embodiment. [Figure 9] 10 is a liner kit according to a fourth embodiment. [Figure 10] 10 is a liner kit according to a fifth embodiment. [Figure 11] This is an example of a liner kit 10(iii) in another use example 1. [Figure 12] This is an example of the liner kit 10(iv) in another use example 2. [Figure 13] This is an example of liner kit 10(v) in another use example 3. [Figure 14] This is an example of liner kit 10(vi) in another use example 4. [Figure 15] This is an example of a liner kit 10(vii) in another use example 5. [Figure 16] This is an example of liner kit 10(viii) in another use example 6. DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, a preferred embodiment of the present invention will be described with reference to the drawings.

[0022] (First embodiment) Fig. 1 is a liner design diagram of a liner kit according to a first embodiment of the present invention when it is attached to a bucket B of a backhoe, as an example. Fig. 2 is a cross-sectional view of the liner kit according to the first embodiment (a cross-sectional view taken along line II-II in Fig. 1).

[0023] Figure 1(A) shows liner kit 10(i) attached to the semicircular plate material B1 portions at two locations on the inside sides of bucket B, which are the required lining portions of bucket B, and Figure 1(B) shows liner kit 10(ii) attached to the curved plate material B2 portion at the center of the inside of bucket B, which is the required lining portion of bucket B.

[0024] As shown in FIG. 2, the liner kits 10(i) and 10(ii) are each composed of a liner 10 that is placed over (covered with) the steel plate materials B1 and B2 of the bucket B, which is the mating member, and a welding bushing 20.

[0025] The liner 10 is made of a plastic plate containing ultra-high molecular weight polyethylene (UHMW-PE). UHMW-PE plastic plate is a polymer formed by injection molding powdered UHMW-PE, with an average molecular weight of 1 million or more and an average particle size typically in the range of 100 to 200 microns. The liner 10 is formed, for example, as a polyethylene molded plate containing 99% UHMW-PE by weight. The inclusion of UHMW-PE gives the liner 10 greater abrasion resistance than polyacetal, fluororesin, and PA66 nylon, greater impact resistance than polycarbonate, and excellent self-lubrication, sliding properties, and chemical resistance. Furthermore, its low water absorption, UV absorption, and static charge make it ideal as a liner for bucket B. Furthermore, UHMW-PE has a lower specific gravity than water, which makes it advantageous for reducing the product weight when molded into a liner. As shown in liner kits 10(i) and 10(ii), the liner 10 is made by cutting out UHMW-PE plastic plates according to the customer's requirements (to match the shapes of the plates B1 and B2, which are the required lining portions). The thickness T10 of the liner 10 is 13 mm, with a dimensional tolerance of +0.2 mm to +0.3 mm. The thickness T10 of the liner 10 is 9 mm, so it remains flexible and can be curved and stacked to fit the shape of the curved plate B2 inside the bucket.

[0026] The liner 10 is formed with mounting holes 11 at multiple locations for inserting welding bushings 20. Fig. 3 is a plan view of the vicinity of the mounting holes 11 of the liner 10. The mounting holes 11 are formed as stepped holes with large-diameter circular holes 12 in an upper region on the front surface side of the liner 10 and small-diameter circular holes 13 in a lower region on the back surface side of the liner 10. As shown in Fig. 2, the inner diameter d12 of the large-diameter circular holes 12 is 40 mm, and the inner diameter d13 of the small-diameter circular holes 13 is 25 mm, with the respective inner diameters d12 and d13 being constant (non-tapered) and with a dimensional tolerance of +0.2 mm to +0.4 mm. The arrangement of the multiple mounting holes 11 in the liner 10 will be described later.

[0027] A welding bushing 20 is inserted into the mounting hole 11. FIG. 4 is a longitudinal cross-sectional view of the welding bushing 20. The welding bushing 20 is made of metal, preferably formed from carbon steel for mechanical structures (e.g., S45C). The welding bushing 20 comprises a cylindrical bushing body 21 and an upper flange 22. The height H21 of the cylindrical bushing body 21 is 5 mm, and the height H22 of the flange 22 is 4 mm. The outer diameter D21 of the bushing body 21 is 25 mm, and the diameter D22 of the flange 22 is 40 mm, with the outer diameter D21 and diameter D22 being constant (not tapered) and with a dimensional tolerance of -0.2 mm to 0.0 mm. The flange 22 is solid except for a through-hole 23, which will be described later.

[0028] When the welding bushing 20 is inserted into the mounting hole 11, the outer diameter D21 of the bushing body 21 and the small diameter hole 13 of the liner 10 roughly coincide, the diameter D22 of the flange portion 22 and the large diameter hole 12 of the liner 10 roughly coincide, and the height H20 of the welding bushing 20 roughly coincides with the thickness T10 of the liner 10. Therefore, the mounting hole 11 formed in the liner 10 is closed with a member of roughly the same shape (the welding bushing 20), so no cap material or the like is required to close the mounting hole 11.

[0029] A through hole 23 is formed in the center of the bushing body 21, and the basic inner diameter d23 of the through hole 23 is 10 mm. Here, the through hole 23 of the welding bushing 20 has a non-tapered portion 24 where the basic inner diameter d23 remains constant, and then a tapered portion 25 where the inner diameter widens toward the bottom in the lower region where the plate materials B1 and B2 of the bucket B, which is the mating member, are located. The tapered portion 25 is formed with a slope such that the inner diameter at its upper end is 10 mm, the same as the basic inner diameter d23, and the inner diameter d25 at its lower end is 20 mm. The dimensional tolerance of the tapered portion 25 is 0.0 mm to +0.2 mm.

[0030] Tapered portion 25 is provided only in a lower region adjacent to plate materials B1 and B2 of bucket B, which is the mating member. The lower end of tapered portion 25 is provided so as to come into contact with plate materials B1 and B2 of bucket B, which is the mating member.

[0031] The work of attaching the liner kit 10(i) configured as described above to the plate material B1 of the mating member (bucket B) will be described.

[0032] The worker places the liner 10 of liner kit 10(i) on the inside lateral plate B1 portion of bucket B (e.g., the left side). At this time, there is no need to tap the plate B1 of the mating member; the liner 10 simply needs to be placed to match the shape of the plate B1. Next, the worker inserts a welding bushing 20 into the mounting hole 11 and arc-welds the through hole 23 with a semi-automatic welding machine. The worker repeats the same procedure (inserting a welding bushing 20 and semi-automatic arc welding) for the multiple mounting holes 11 provided in liner kit 10(i), and when the work has been done for all mounting holes 11, the installation is complete. In the case of bucket B, the worker similarly attaches liner kit 10(i) to the opposite plate B1 portion (the right side), and similarly attaches liner kit 10(ii) to the inside center plate B2 portion, completing the work.

[0033] 5 is a cross-sectional view of the liner kit according to the first embodiment after installation, and schematically shows the state after semi-automatic arc welding has been performed from the state shown in FIG. 2. When arc welding is performed on the through hole 23 of the welding bushing 20, the welding wire (high-tensile steel wire, for example, YM60) melts and becomes a weld material, which flows down the through hole 23. At this time, because the through hole 23 has a tapered portion 25 in the lower region, the weld material mixes well with the mating member (the plate materials B1 and B2) in this tapered portion 25, forming a weld layer 27 that is wider than the basic inner diameter d23.

[0034] As described above, with the liner kits 10(i) and 10(ii) of this embodiment, the installation process involves simply placing the liner 10 on the plate material B1 or B2, which is the required lining portion of the mating member, and then fastening the liner 10 to the welding bushing 20 in the mounting hole 11 using a semi-automatic welding machine. Therefore, there is no need to struggle with aligning the liner 10 with the mating member (plate material B1 or B2), and semi-automatic welding is quick, so even beginners can complete the installation process in a short time. Furthermore, semi-automatic welding machines are easy to use, even for beginners, and are less likely to result in quality variations due to human error, making them easy to introduce. Therefore, we believe that there is a great demand for the liner kits 10(i) and 10(ii), which facilitate installation, from customers who require lining processing, especially those who frequently replace liners during busy periods.

[0035] Furthermore, the liner kits 10(i) and 10(ii) of this embodiment use an original welding bushing 20 with a tapered portion 25 that flares out from the bottom, thereby expanding the welding area and increasing the fixing strength of the liner 10. In a typical bushing, the inner diameter of the through hole is constant (without a tapered portion 25). With this bushing, the welding material remains throughout the entire through hole, and the welding area with the base metal is at most equal to or smaller than the inner diameter of the through hole. In response to this, the applicant has succeeded in expanding the welding area with the base metal by using a welding bushing 20 with a tapered portion 25 provided in the lower region adjacent to the mating member, which makes it easier for the welding material to remain at high temperature in the lower region.

[0036] Compared to UHMW-PE plastic sheets, rubber liners made of urethane rubber containing UHMW-PE are known. However, rubber liners are soft, and when hard, heavy objects such as stones, gravel, or snow lumps are moved, the urethane rubber content means that the abrasion resistance (surface hardness) is poor, causing the liner to form waves (wrinkles), which can trap gravel or snow, deteriorating sliding properties.

[0037] For this reason, the applicant began considering using a plastic plate containing UHMW-PE as a liner. However, UHMW-PE plastic plate has very high self-lubricating and sliding properties, and its surface is smooth, so it has the disadvantage of being difficult to fix to the mating component compared to rubber liners, and the liner is prone to coming off. In addition, UHMW-PE plastic plate has a large linear expansion coefficient and is prone to dimensional changes due to temperature, so the applicant also raised the issue of what kind of fixing method to use.

[0038] To address this issue, the applicant used an original welding bushing 20 with a tapered portion 25 that widens at the bottom, thereby expanding the welding area with the base material, and this overcame the issue of the tendency for the bushing to come loose, leading to the filing of this patent application. Furthermore, to address the issue of temperature deformation of UHMW-PE plastic plates, welding and fixing using a welding bushing 20, which does not require positional precision with the mating member, was an ideal means of fixing UHMW-PE plastic plates.

[0039] Another advantageous effect of the liner kits 10(i) and 10(ii) is their reversible installation. The liner kits 10(i) and 10(ii) secure the liner 10 to the mating member (plate material B1 or B2) by forming a welding layer 27 on the back surface of the liner 10 without drilling screw holes in the mating member (plate material B1 or B2). The liner 10 can then be removed from the mating member (plate material B1 or B2) by grinding away the welding bushing 20 and breaking the welding layer 27 using a rotary grinding tool such as a grinder, sander, or carbide flat drill. This allows the liner kits 10(i) and 10(ii) to be used as a reversible lining treatment. Furthermore, the liner 10 can be reused by simply inserting a new welding bushing 20 into the removed liner 10, which is economical. Furthermore, if the liner 10 is no longer in use, it can be resold.

[0040] As described above, this embodiment provides a new and innovative "liner kit" that can easily and quickly install a high-performance liner that is slidable, abrasion-resistant, impact-resistant, chemical-resistant, non-water-absorbent, non-UV-absorbent, and non-static, and that also allows for reversible installation. Furthermore, the problem of fixing strength when using a UHMW-PE plastic plate as a liner has been resolved.

[0041] Furthermore, the liner does not wrinkle, which is a problem with rubber liners, and therefore maintains its sliding properties. This stabilizes the load capacity of trucks and improves operational efficiency. Furthermore, maintaining high sliding properties reduces the time and labor required for cleaning the liner 10 after machine operation.

[0042] It is also estimated that the use of the liner 10 will extend the service life of the lining portion by four to six times compared to when the liner 10 is not used. This makes it possible to extend the service life of machines that wear out due to repeated loading, unloading, and transport, such as snow blowers, excavators, wheel loaders, trucks, hoppers, etc.

[0043] (Second embodiment) 6 shows a liner kit according to a second embodiment. In this embodiment, the shape of the through hole 23' of the welding bushing 20 is changed from that of the first embodiment. The same components as those in the first embodiment are designated by the same reference numerals and will not be described again.

[0044] A through hole 23' is formed in the center of the bushing body 21 of the welding bushing 20, and in this embodiment, the basic inner diameter d23 of the through hole 23' is 20 mm. The through hole 23' has a non-tapered portion 24 with a constant basic inner diameter d23, followed by a reverse tapered portion 26 where the inner diameter narrows toward the mating member, and then a tapered portion 25 where the inner diameter widens toward the mating member. The reverse tapered portion 26 is formed with a slope such that the inner diameter at its upper end is 20 mm, the same as the basic inner diameter d23, and the inner diameter d26 at its lower end is 17 mm. In this embodiment, the tapered portion 25 has an inner diameter d25U at its upper end, the same as the inner diameter at the lower end of the reverse tapered portion 26, 17 mm, and the inner diameter d25 at its lower end is sloped back to the basic inner diameter d23, 20 mm. The dimensional tolerance of tapered portion 26 and tapered portion 25 is 0.0 mm to +0.2 mm. Reverse tapered portion 26 and tapered portion 25 are formed to a height H2526 that is approximately half the height H21 of bushing body 21. In this embodiment, tapered portion 25 is also provided only in a lower region adjacent to plate materials B1 and B2 of bucket B, which is the mating member, and the lower end of tapered portion 25 is provided so as to come into contact with plate materials B1 and B2 of bucket B, which is the mating member.

[0045] In this embodiment, the installation process is similar. The liner 10 is placed over the plate materials B1 and B2 that are the lining portions of the mating members, the welding bushing 20 is inserted into the mounting hole 11, and arc-welded using a semi-automatic welding machine. When arc-welding is performed on the through hole 23' of the welding bushing 20, the welding wire melts and becomes a weld material, which flows down the through hole 23'. Because the through hole 23' has a counter-tapered portion 26, the weld material is guided to the tapered portion 25 in the lower region. As a result, the weld material mixes well with the mating members (plate materials B1 and B2) in the tapered portion 25, forming a weld layer 27 that is wider than the basic inner diameter d23. In this embodiment, the liner 10 can also be removed by breaking the weld layer 27 through rotary grinding.

[0046] As described above, according to the liner kits 10(i) and 10(ii) using the welding bushing 20 of this embodiment, similar to the first embodiment, a new and revolutionary "liner kit" can be provided that can easily and quickly install a high-performance liner that is slidable, wear-resistant, impact-resistant, chemical-resistant, non-water-absorbent, non-UV-absorbent, and non-static, and that also allows for reversible installation.

[0047] Furthermore, in this embodiment, the through hole 23' of the welding bushing 20 is further provided with a counter-tapered portion 26, which allows for screw fastening, a conventional method. FIG. 7 is a cross-sectional view of the liner kit according to the second embodiment when attached with a screw. As shown in the figure, the screw head rests on the counter-tapered portion 26, so the liner kits 10(i) and 10(ii) using the welding bushing 20 of this embodiment can be provided as two-way specifications that allow for fastening by welding or by screws.

[0048] (Third embodiment) 8 shows a liner kit according to a third embodiment. In this embodiment, the shape of the flange portion 22' of the welding bushing 20 is changed from that of the first embodiment. The same components as those in the first embodiment are designated by the same reference numerals and will not be described again.

[0049] The flange 22' of the welding bushing 20 of this embodiment has a diameter D22 of 45 mm, and is formed to be 180% of the outer diameter D21 of the bushing body 21: 25 mm. In accordance with this change, the inner diameter d12 of the large circular hole 12 of the mounting hole 11 of the liner 10 is also changed to 45 mm.

[0050] The installation process is similar in this embodiment, with the liner 10 overlapping the plate materials B1 and B2 that will be the lining portions of the mating members, the welding bushing 20 inserted into the mounting hole 11, and arc welding performed using a semi-automatic welding machine. As described above, the welding material then mixes well with the mating members (plate materials B1 and B2) at the tapered portion 25 in the lower region, forming a welding layer 27 that is wider than the basic inner diameter d23. Furthermore, in this embodiment, the length of the flange portion 22' is extended, which increases the effect of the welding bushing 20 in pressing down on the liner 10 and allows for more stable fixation. Similarly, the liner 10 can be removed by breaking the welding layer 27 through rotary grinding.

[0051] As described above, the liner kits 10(i) and 10(ii) using the welding bushing 20 of this embodiment, like the first embodiment, can provide a new and revolutionary "liner kit" that allows for easy and fast installation of a high-performance liner that is slidable, abrasion-resistant, impact-resistant, chemical-resistant, non-water-absorbent, non-UV-absorbent, and non-static, and also allows for reversible installation. Furthermore, since the liner does not wrinkle, which is a problem with rubber liners, slidability is maintained.

[0052] Furthermore, in this embodiment, the length of flange 22 is suitably extended, thereby increasing the fixing strength. The extension of flange 22' length is preferably 180% to 300% of the outer diameter D21 of bushing body 21. If it is less than 180%, the effect of increasing fixing strength is not achieved, and if it exceeds 300%, the moment acting on flange 22' becomes too large, which may lead to detachment of weld layer 27.

[0053] (Fourth embodiment) 9 shows a liner kit according to a fourth embodiment. In this embodiment, the shape of the through hole 23'' of the welding bushing 20 is changed from that of the first embodiment. The same components as those in the first embodiment are designated by the same reference numerals and will not be described again.

[0054] A through hole 23" is formed in the center of the bushing body 21 of the welding bushing 20, and in this embodiment, the through hole 23" has a basic inner diameter d23 of 20 mm. The through hole 23" has a non-tapered portion 24 that maintains the basic inner diameter d23, followed by a reverse tapered portion 28 whose inner diameter tapers toward the mating member. The reverse tapered portion 28 is formed with a slope such that the inner diameter at its upper end is 20 mm, the same as the basic inner diameter d23, and the inner diameter d28 at its lower end is 10 mm. The dimensional tolerance of the reverse tapered portion 28 is 0.0 mm to +0.2 mm. The lower end of the reverse tapered portion 28 is arranged to come into contact with the plate materials B1 and B2 of the bucket B, which is the mating member.

[0055] In this embodiment, the installation work is similar: the liner 10 is placed on the plate materials B1 and B2 that are the required lining portions of the mating member, the welding bushing 20 is inserted into the installation hole 11, and arc welding is performed using a semi-automatic welding machine. When arc welding is performed on the through hole 23'' of the welding bushing 20, the welding wire melts and becomes a weld material that flows down the through hole 23'' and forms a weld layer 27. In this embodiment, too, the liner 10 can be removed by breaking the weld layer 27 with rotary grinding. Therefore, in this embodiment, too, a new and innovative ``liner kit'' can be provided that allows for the easy and fast installation of a high-performance liner that is slidable, wear-resistant, impact-resistant, chemical-resistant, non-water-absorbent, non-UV-absorbent, and non-static, and that also allows for reversible installation.

[0056] (Fifth embodiment) 10 shows a liner kit according to a fifth embodiment. In this embodiment, the welding bushing 20 of the first embodiment is replaced with a disk magnet 30 and a metal lid body 40. The same components as those of the first embodiment are designated by the same reference numerals and will not be described again.

[0057] In the mounting hole 11, a disk magnet 30 is inserted into the location where the bushing body 21 of the welding bushing 20 was inserted. The diameter of the disk magnet 30 is set to match the inner diameter d13 (25 mm) of the small diameter hole 13 of the liner 10. Although not limited to this, a neodymium magnet is preferably used for the disk magnet 30. In the mounting hole 11, a lid 40 is inserted into the location where the flange portion 22 of the welding bushing 20 was inserted. The diameter of the lid 40 is set to match the inner diameter d12 (40 mm) of the large diameter hole 12 of the liner 10. Although not limited to this, carbon steel such as S45C is preferably used for the lid 40.

[0058] In the installation process of this embodiment, first, the liner 10 is placed on the plate materials B1 and B2 that will be the lining portions of the mating members, and then the disk magnet 30 is inserted into the small diameter hole 13 of the mounting hole 11, causing the plate materials B1 and B2 to be attracted to the disk magnet 30. Next, when the lid body 40 is inserted into the large diameter hole 12 of the mounting hole 11, the lid body 40 is attracted to the disk magnet 30 and presses down on the liner 10, resulting in the liner 10 being fixed to the mating members (plate materials B1 and B2).

[0059] As described above, this embodiment provides a novel and innovative "liner kit" that allows for easy and fast installation of a high-performance liner that is slidable, abrasion-resistant, impact-resistant, chemical-resistant, non-water-absorbent, non-UV-absorbing, and non-static. Furthermore, since welding is not required, installation is even easier and faster. Furthermore, the liner 10 can be removed from the mating members (plates B1 and B2) by sliding the liner 10 while bringing a removal jig, made of, for example, a steel plate thicker than the mating members B1 and B2, close to the magnet 30 so that a lateral force is applied to the magnet 30. Furthermore, this method allows for the disk magnet 30 and lid 40 to be recovered without damage, making it even more economical and allowing for resale as a "liner kit."

[0060] (Mounting hole layout example) Next, a preferred arrangement of the mounting holes 11 in the liner 10 will be described. This will be explained using liner kits 10(i) and 10(ii) for bucket B in Figure 1. The mounting holes 11 are provided at predetermined intervals in a peripheral region 101 of the liner 10, which is cut to match the shapes of the plate materials B1 and B2 that will form the lining portions of the mating member. That is, the mounting holes 11 are provided at predetermined intervals in the peripheral region 101 of the liner 10, which is semicircular in the case of liner kit 10(i), and in the peripheral region 101 of the liner 10, which is rectangular in the case of liner kit 10(ii). Furthermore, in the inner region 102, which is inside the peripheral region 101, the mounting holes 11 are preferably provided at intervals wider than the predetermined intervals, and their placement is thinned out. This is to reduce material costs and installation time while maintaining the required fixing strength, and to maintain overall sliding performance by increasing the area of ​​the UHMW-PE plastic plate.

[0061] In addition to the above, the arrangement of the mounting holes 11 may also be modified as follows. This modification is more effective for the liner kit 10(ii), which is the portion of the liner kits 10(i) and 10(ii) where stones, gravel, concrete, snow, etc. primarily move. The direction of movement of stones, gravel, concrete, snow, etc. is indicated by the symbol X in FIG. 1(B). In the peripheral region 101, the mounting holes 11 arranged in the direction Y perpendicular to the movement direction X are preferably arranged at intervals narrower than the above-mentioned predetermined interval. Increasing the fixing strength in the movement direction X, in which a load is applied to the liner 10, can further prevent the liner 10 from coming off and can also prevent gravel, etc., from getting between the liner 10 and the plate material B1 (B2). In addition, the mounting holes 11 are preferably arranged symmetrically with respect to the axis of symmetry P, which is set in the same direction as the movement direction X. This efficiently distributes the force acting in the movement direction X, in which a load is applied to the liner 10, thereby preventing the liner 10 from coming off.

[0062] (Example of using a liner kit) The above describes the embodiment and arrangement example using the liner kits 10(i) and 10(ii) for the bucket B of the excavator, but other use examples of the liner kits will be described.

[0063] (Another use case 1) Figure 11 shows a liner kit 10(iii) in another use example 1, which is an example of a liner kit 10(iii) to be attached to the backside of a bucket B of a backhoe. The liner kit 10(iii) is prepared by cutting out a liner 10 into a rectangular shape that roughly matches the length of the bucket, and these are provided to the customer as a set of, for example, a plurality of pieces together with a welding bushing 20.

[0064] (Another use case 2) 12 shows a liner kit 10(iv) in another use example 2, which is an example of a liner kit 10(iv) that is attached to the inside of a bucket of a wheel loader. The liner kit 10(iv) is provided to a customer, for example, by cutting out a single large rectangular liner 10 together with a welding bushing 20.

[0065] (Other use case 3) 13 shows a liner kit 10(v) in another use example 3, which is an example of a liner kit 10(v) to be attached to the blade of a backhoe. The liner kit 10(v) is prepared by cutting out the liner 10 into a large rectangular shape that matches the width direction of the blade, and providing it to the customer together with the welding bushing 20.

[0066] (Other use case 4) 14 shows a liner kit 10(vi) in another use example 4, which is an example of a liner kit 10(vi) to be attached to the chute of a snow blower. The liner kit 10(vi) is provided to the customer by cutting out the liner 10 into a shape that roughly matches the inner shape of the chute, together with the welding bushing 20.

[0067] (Other use case 5) Figure 15 shows a liner kit 10(vii) in another use example 5, which is an example of a liner kit 10(vii) to be attached to the bed of a truck. The liner kit 10(vii) is a large rectangular liner 10, and is provided to the customer as a single liner or a set of multiple liner kits 10, together with a welding bushing 20, to fit the size of the truck.

[0068] (Other use cases 6) 16 shows a liner kit 10(viii) in another use example 6, which is an example of a liner kit 10(viii) to be attached to the inlet portion of a hopper for industrial waste treatment, for example. The liner kit 10(viii) is cut to fit the inner shape of the hopper, for example, in the case of the hopper shown in the figure, and two rectangular liners 10 and two trapezoidal liners 10 are cut out and provided to the customer together with the welding bushings 20.

[0069] As described above, the liner kit according to the present invention is provided to customers as a liner kit that combines the liner 10 customized to fit the shape of the lining-requiring portion of the mating member with the welding bushing 20 for fixing it. The liner kit according to the present invention is not limited to the machines described in the above embodiments and usage examples, but can be applied to any machine that has a lining-requiring portion.

[0070] It is also preferable that the welding bushing 20 be made of stainless steel. By making the welding bushing 20 out of stainless steel, it has the same strength as the liner 10 (UHMW-PE plastic plate), so the wear areas of the liner 10 and the bushing 20 are kept uniform.

[0071] The above describes preferred embodiments and modifications of the present invention, but these are merely examples of the present invention, and each embodiment and each modification can be combined based on the knowledge of a person skilled in the art, and such combinations are also included in the scope of the present invention. [Explanation of symbols]

[0072] 10(i) to 10(viii)...liner kit, 10...liner, 11...mounting hole, 12...large diameter hole, 13...small diameter hole, 20...welding bushing, 21...bush body 21, 22...flange portion, 23...through hole, 24...non-tapered portion, 25...tapered portion, 26: counter-tapered portion, 27: welding layer, 30:disc magnet, 40:lid body, B1, B2: plate material of counterpart member (portion requiring lining), 101:periphery of liner, 102:inner region of liner

Claims

1. a liner made of a plastic plate material containing ultra-high molecular weight polyethylene, which is placed on a plate material that is a required lining portion of a mating member and cut out to fit the shape of the required lining portion; a plurality of stepped mounting holes formed in the liner, each having a larger diameter on the front side and a smaller diameter on the back side; a metallic bushing with an upper flange, which is inserted into the mounting hole and has a through hole with a basic inner diameter in the center of its body, and which has a tapered portion in a portion adjacent to the mating member where the inner diameter of the through hole widens toward the mating member, the tapered portion being provided below a counter-tapered portion where the inner diameter of the through hole narrows toward the mating member, and the counter-tapered portion being provided below a non-tapered portion where the basic inner diameter remains constant, and a welding bushing which is solid except for the through hole; Equipped with When the liner is arc-welded to the mating member, a welding material is guided from the counter-tapered portion to the tapered portion in the lower region of the through hole of the welding bushing to form a welding layer with the mating member, When the liner is screwed to the mating member, the screw head engages with the counter-tapered portion of the welding bushing, Fixation by welding or screws is possible A liner kit.

2. 2. The liner kit according to claim 1, wherein the diameter of the flange of the welding bushing is set to be 180% or more and 300% or less of the outer diameter of the bushing body.

3. 2. The liner kit according to claim 1, wherein the diameter of the flange portion of the welding bushing and the large diameter hole of the liner are approximately the same, the outer diameter of the bushing body of the welding bushing and the small diameter hole of the liner are approximately the same, and the height of the welding bushing and the thickness of the liner are approximately the same.

4. A liner kit as described in claim 1, characterized in that the mounting holes are provided in multiple locations at predetermined intervals in the peripheral region of the liner, and in an inner region inside the peripheral region, the mounting holes are provided at intervals wider than the predetermined intervals.

5. A liner kit as described in claim 4, characterized in that in the surrounding area, in a direction perpendicular to the direction of movement of an object moving on the opposing member, the mounting holes are arranged at intervals narrower than the specified interval, and the mounting holes are arranged linearly symmetrically with respect to an axis of symmetry set in the same direction as the direction of movement.

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