Backstop device

Abstract

To suppress lateral displacement of a backstop with respect to a receiving member.SOLUTION: The back stop 24 is attached to the back stop side structure 23 and received by the receiving member side 21a to restrict the rotation of the back stop side structure 23 with respect to the receiving member side structure 21. The support 27 is attached to the backstop side structure 23 and the backstop 24. The support 27 supports the backstop 24 at a predetermined position with respect to the backstop side structure 23. The backstop position adjustment device 30 is provided on the support 27 and is configured to be able to adjust the position of the backstop 24 in the lateral direction Y relative to the backstop side structure 23.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] BACKGROUND OF THE INVENTION The present invention relates to a backstop device for limiting rotation of a work machine structure. [Background technology]

[0002] For example, Patent Document 1 describes a conventional backstop device. The document describes a backstop (called a boom support in the document) that limits the rotation of a structure of a work machine (called a boom in the document). The backstop is received by a receiving member (called a boom support receiving portion in the document). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-84811 Summary of the Invention [Problem to be solved by the invention]

[0004] If the backstop shifts laterally relative to the receiving member, the backstop may become caught on the receiving member, causing the operation of the backstop to become unstable. Therefore, it is desirable to be able to suppress the backstop from shifting laterally relative to the receiving member.

[0005] An object of the present invention is to provide a backstop device that can suppress lateral displacement of the backstop relative to the receiving member. [Means for solving the problem]

[0006] The backstop device comprises a support member side structure, a backstop side structure, a backstop, a support, and a backstop position adjustment device. The support member side structure is a structure of the work machine and has a support member. The backstop side structure is a structure of the work machine that is attached to the support member side structure and is rotatable around a rotation axis extending laterally relative to the support member side structure. The backstop is attached to the backstop side structure and is configured to be received by the support member, thereby limiting rotation of the backstop side structure relative to the support member side structure. The support is attached to the backstop side structure and the backstop, and supports the backstop at a predetermined position relative to the backstop side structure. The backstop position adjustment device is provided on the support and is configured to be able to adjust the lateral position of the backstop relative to the backstop side structure. [Effects of the Invention]

[0007] The backstop device described above can prevent the backstop from shifting laterally relative to the receiving member. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a view of the work machine 10 as seen from the lateral direction Y. FIG. [Figure 2] 2 is a view of the backstop device 20 shown in FIG. 1 as seen from the lateral direction Y. FIG. [Figure 3] FIG. 3 is a view taken along the arrows F3-F3 in FIG. 2. [Figure 4] FIG. 4 is a diagram showing a portion F4 shown in FIG. 3. [Figure 5] 4 when all the shims 70 shown in FIG. 6 are arranged in the left shim arrangement position S70l. [Figure 6] FIG. 3 is a diagram showing part F6 in FIG. 2. [Figure 7] 7 is a view of the shim 70 shown in FIG. 6 as viewed from the lateral direction Y. FIG. [Figure 8]5 is a perspective view of the backstop position adjustment device 30 and the like shown in FIG. 4, showing a state in which the shim 70 is separated from the connecting pin 61. FIG. [Figure 9] 8, showing a state in which a shim 70 is attached to a connecting pin 61. FIG. [Figure 10] 9 and shows a state in which a shim holding pin 63 is attached to a shim 70. FIG. [Figure 11] FIG. 5 is a view of the second embodiment corresponding to FIG. 4. [Figure 12] FIG. 7 is a view corresponding to FIG. 6 of the second embodiment. [Figure 13] FIG. 10 is a view of the third embodiment corresponding to FIG. 4. [Figure 14] FIG. 10 is a view of the third embodiment corresponding to FIG. 6. [Figure 15] FIG. 10 is a view of the fourth embodiment, corresponding to FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) A work machine 10 equipped with a backstop device 20 of a first embodiment will be described with reference to FIGS. 1 to 10.

[0010] As shown in Figure 1, the work machine 10 is a machine that performs work. The work machine 10 may be a construction machine that performs construction work, or a loading and unloading machine that performs loading and unloading work. The work machine 10 is, for example, a crane. The work machine 10 comprises a machine body 10a, a boom 15, a boom hoisting device 16, a jib 17, a jib hoisting device 18, and a backstop device 20. Note that Figure 1 shows two backstop devices 20.

[0011] The machine body 10a is the main body portion of the work machine 10. The machine body 10a includes a lower body 11 and an upper rotating body 13.

[0012] The lower body 11 supports the upper rotating body 13. The lower body 11 may be a structure fixed to a fixed surface (such as the ground), or may be capable of traveling on a traveling surface (such as the ground). For example, the work machine 10 may be a fixed crane or a mobile crane. When the lower body 11 is capable of traveling (when it is a lower traveling body), the lower body 11 may be provided with crawlers or wheels. For example, the work machine 10 may be a crawler crane or a wheeled crane.

[0013] The upper rotating body 13 is mounted on the lower body 11 so as to be able to rotate.

[0014] The boom 15 is attached to the upper rotating body 13 so as to be able to rise and fall (rotate in the vertical direction). The boom 15 is, for example, a lattice boom having a lattice structure. The cross-sectional shape of the boom 15 when viewed in the longitudinal direction of the boom 15 is rectangular (see the backstop side structure 23 in Figure 3). The boom 15 includes a plurality of pipes. The boom 15 can be disassembled in the longitudinal direction of the boom 15. The boom 15 includes a lower boom 15l, an intermediate boom 15m, and an upper boom 15n. The lower boom 15l is disposed at the base end of the boom 15 (the end on the upper rotating body 13 side). The intermediate boom 15m is connected to the tip end of the lower boom 15l (the end on the opposite side from the upper rotating body 13 side). The upper boom 15n is connected to the tip end of the intermediate boom 15m and is disposed at the tip end of the boom 15. The upper boom 15n may be a substantially hexahedral member (boom head, tower cap) or a member that is long in the axial direction of the boom 15. The intermediate boom 15m does not have to be provided. The upper boom 15n may be connected to the tip of the lower boom 15l without the intermediate boom 15m. Terms such as "base end," "tip," and "end" include not only the strict end but also the surrounding area of ​​the end (the same applies to "end" below).

[0015] The boom hoisting device 16 is a device that raises and lowers the boom 15 relative to the upper rotating body 13. The boom hoisting device 16 includes a gantry 16a, a boom guy line 16d, and a boom hoist rope 16r. The gantry 16a includes a compression member 16a1 attached to the upper rotating body 13 and a tension member 16a2 connected to the tip of the compression member 16a1 and the rear end of the upper rotating body 13. The boom guy line 16d and the boom hoist rope 16r are connected to the tip of the compression member 16a1 and the tip of the boom 15. When a winch (not shown) reels in and pays out the boom hoist rope 16r, the boom 15 is raised and lowered relative to the upper rotating body 13.

[0016] The configuration of the boom hoisting device 16 can be modified in various ways. For example, a mast may be provided instead of the gantry 16a. The mast may have, for example, a lattice structure (including a lattice mast) or a box-shaped structure (hollow structure). In this case, the mast is attached to the upper rotating body 13 so that it can be raised and lowered, and is disposed in the same position as the compression member 16a1. The boom guy line 16d is connected to the tip of the mast and the tip of the boom 15. The boom hoisting rope 16r is hung between a sheave provided at the tip of the mast and a sheave provided at the rear end of the upper rotating body 13. A winch (not shown) reels in and pays out the boom hoisting rope 16r, causing the mast to be raised and lowered relative to the upper rotating body 13, and as a result, the boom 15 is raised and lowered relative to the upper rotating body 13. The work machine 10 may also be provided with multiple masts, or may be provided with a gantry 16a and a mast.

[0017] The jib 17 is attached to the boom 15 so that it can be raised and lowered (rotated up and down). The jib 17 may be, for example, a lattice jib having a lattice structure. In this case, the cross-sectional shape of the jib 17 when viewed in the longitudinal direction of the jib 17 is rectangular (see the backstop side structure 23 in Figure 3). The jib 17 includes multiple pipes. The jib 17 may have a box-shaped structure (hollow structure). The jib 17 may be disassembled in the longitudinal direction of the jib 17. In this case, the jib 17 includes, for example, a lower jib 17l, an intermediate jib 17m, and an upper jib 17n. The lower jib 17l is disposed at the base end of the jib 17 (the end on the boom 15 side). The intermediate jib 17m is connected to the tip end of the lower jib 17l (the end on the opposite side from the boom 15 side). The upper jib 17n is connected to the tip of the intermediate jib 17m and is disposed at the tip of the jib 17. The intermediate jib 17m does not necessarily have to be provided. The upper jib 17n may be connected to the tip of the lower jib 17l without the intermediate jib 17m.

[0018] The jib hoisting device 18 is a device that raises and lowers the jib 17 relative to the boom 15. The jib hoisting device 18 includes struts 18a (rear strut 18a1, front strut 18a2), ​​jib guy line 18b, strut guy line 18c, jib hoist rope 18r, and jib hoist winch 18w. The strut 18a is rotatably attached to the upper boom 15n. The jib guy line 18b is connected to the tip of the front strut 18a2 and the tip of the jib 17. The strut guy line 18c and the jib hoist rope 18r are connected to the tip of the rear strut 18a1 and, for example, the boom 15. The jib hoisting winch 18w is a winch that is mounted on the upper rotating body 13 or the boom 15. When the jib hoisting winch 18w winds and unwinds the jib hoisting rope 18r, the strut 18a rotates relative to the boom 15, causing the jib 17 to be raised and lowered relative to the boom 15.

[0019] The configuration of the jib hoisting device 18 can be modified in various ways. For example, the jib hoist rope 18r may be hung between a sheave provided on the front strut 18a2 and a sheave provided on the rear strut 18a1. When the jib hoisting winch 18w winds and unwinds the jib hoist rope 18r, the distance between the front strut 18a2 and the rear strut 18a1 changes, causing the jib 17 to be raised and lowered relative to the boom 15. Also, only one strut 18a may be provided.

[0020] The boom 15 and the jib 17 may be raised and lowered when the work machine 10 is operating (for example, during crane operation). One or both of the boom 15 and the jib 17 do not have to be raised and lowered when the work machine 10 is operating.

[0021] The backstop device 20 is a device that limits the rotation of the backstop side structure 23 relative to the receiving member side structure 21. The backstop device 20 includes the receiving member side structure 21, the backstop side structure 23, a backstop 24, a support 27, and a backstop position adjustment device 30 (see FIG. 3).

[0022] The receiving member side structure 21 is a structure having a receiving member 21a. The receiving member side structure 21 may be, for example, the upper rotating body 13, the boom 15, the strut 18a, or the jib 17 (details will be described later). The receiving member side structure 21 is provided with the receiving member 21a.

[0023] As shown in FIG. 2, the receiving member 21a is a member that receives (receives, supports) the backstop tip 24t (described later). The receiving member 21a receives the backstop tip 24t when the angle (relative angle) of the backstop side structure 23 with respect to the receiving member side structure 21 is within a predetermined range. The receiving member 21a is disposed at a position away from the backstop tip 24t when the angle of the backstop side structure 23 with respect to the receiving member side structure 21 is not within the "predetermined range." The receiving member 21a is, for example, plate-shaped and is disposed so as to extend in a direction perpendicular to the lateral direction Y. Note that the receiving member 21a does not have to be plate-shaped and may be block-shaped or the like. In the example shown in FIG. 2, the receiving member 21a includes a rail portion 21a1 and a receiving member recess 21a2. The rail portion 21a1 is the portion with which the backstop tip 24t comes into contact and along which the backstop tip 24t slides. The receiving member recess 21a2 is a portion that receives (receives, supports) the backstop tip portion 24t.

[0024] The backstop side structure 23 is a structure to which the backstop 24 is attached. The backstop side structure 23 is attached to the receiving member side structure 21 (see Figure 1). The backstop side structure 23 is rotatable around a rotation axis extending in the lateral direction Y relative to the receiving member side structure 21 (see Figure 1). A portion of the surface of the backstop side structure 23 is referred to as the backstop side structure back surface 23b. The backstop side structure back surface 23b is the surface to which the backstop 24 (for example, the backstop base end portion 24b) is attached. The backstop side structure back surface 23b is the surface to which the support 27 is attached.

[0025] Specific examples of combinations of the backstop-side structure 23 and the receiving member-side structure 21 are as follows. [Example 1] As shown in FIG. 1, the receiving member-side structure 21 may be the upper rotating body 13 and the backstop-side structure 23 may be the boom 15 (e.g., the lower boom 15l), or vice versa (the receiving member-side structure 21 may be the boom 15 and the backstop-side structure 23 may be the upper rotating body 13). [Example 2] The receiving member-side structure 21 may be the boom 15 (e.g., the upper boom 15n) and the backstop-side structure 23 may be the jib 17 (e.g., the lower jib 17l), or vice versa. [Example 3] The rotation of the strut 18a relative to the boom 15 may be limited by the backstop 24. In this case, the receiving member-side structure 21 may be the boom 15 (e.g., the upper boom 15n or the intermediate boom 15m) and the backstop-side structure 23 may be the strut 18a (e.g., the rear strut 18a1), or vice versa. [Example 4] The rotation of a mast (not shown) (for example, a structure located in the same position as the compression member 16a1) relative to the upper rotating body 13 may be limited by the backstop 24. In this case, the support member side structure 21 may be the upper rotating body 13 and the backstop side structure 23 may be the mast, or vice versa. This mast may be a lattice mast as described above, or a mast with a hollow structure.

[0026] The backstop 24 limits the rotation of the backstop-side structure 23 relative to the support member-side structure 21. The backstop 24 is attached to the backstop-side structure 23. The backstop 24 is rotatably attached to the backstop-side structure 23. The direction in which the rotation axis of the backstop 24 relative to the backstop-side structure 23 extends is the lateral direction Y. This rotation (rotation of the backstop 24 relative to the backstop-side structure 23) is limited by the support 27.

[0027] The backstop 24 is configured to be received by the receiving member 21a. The backstop 24 is configured to be received by the receiving member 21a when the angle (relative angle) of the backstop-side structure 23 with respect to the receiving member-side structure 21 is within a predetermined range. The backstop 24 is disposed at a position away from the receiving member 21a when the angle of the backstop-side structure 23 with respect to the receiving member-side structure 21 is not within the "predetermined range." As shown in FIG. 2, the backstop 24 has a shape with a longitudinal direction, and specifically, is substantially rod-shaped. When the backstop 24 is received by the receiving member 21a, the backstop 24 is disposed so as to extend from the backstop base end 24b toward the receiving member 21a. As shown in FIG. 3, for example, a plurality of backstops 24 are provided. Specifically, a total of two backstops 24 are provided, one on each lateral side (left and right) of the backstop-side structure 23. 2, the backstop 24 may be expandable and retractable by a spring 25a, by hydraulic pressure, or by both a spring 25a and hydraulic pressure. The backstop 24 (more specifically, each of the multiple backstops 24) includes a backstop base end portion 24b and a backstop tip end portion 24t. The backstop 24 includes a spring 25a, a tip-side backstop 25t, and a base-side backstop 25b.

[0028] The backstop base end portion 24b is the end portion of the backstop 24 on the side attached to the backstop-side structure 23 in the longitudinal direction.

[0029] The backstop tip portion 24t is the portion that is received by the receiving member 21a. The backstop tip portion 24t is the end portion of the backstop 24 opposite the backstop base end portion 24b in the longitudinal direction. In the example shown in FIG. 2, the backstop tip portion 24t includes a backstop tip guide 24t1. The backstop tip guide 24t1 is a member that ensures that the backstop tip portion 24t is properly received by the receiving member 21a even if the backstop 24 is misaligned in the lateral direction Y relative to the receiving member 21a. The backstop tip guide 24t1, for example, has an inclination. This inclination is inclined with respect to the longitudinal direction of the backstop 24 so that the closer to the center of the backstop tip portion 24t in the lateral direction Y, the more it is positioned toward the base end of the backstop 24. Note that the configurations (shape, structure, etc.) of the backstop tip portion 24t and the receiving member 21a may be modified in various ways.

[0030] The spring 25a urges the base end backstop 25b and the tip end backstop 25t by elastic force in a direction in which the base end backstop 25b and the tip end backstop 25t move away from each other in the longitudinal direction of the backstop 24.

[0031] The proximal backstop 25b is a portion that includes the backstop proximal end portion 24b. The proximal backstop 25b is provided so as to extend in the longitudinal direction of the backstop 24.

[0032] The distal backstop 25t is a portion that includes the backstop distal portion 24t. The distal backstop 25t is provided so as to extend from the proximal backstop 25b toward the distal end of the backstop 24. The distal backstop 25t is attached to the proximal backstop 25b so as to be movable in the longitudinal direction of the backstop 24 relative to the proximal backstop 25b. For example, the distal backstop 25t (backstop inner) is inserted into the proximal backstop 25b (backstop outer). Note that the proximal backstop 25b may also be inserted into the distal backstop 25t.

[0033] The support 27 supports the backstop 24 at a predetermined position relative to the backstop side structure 23. The support 27 limits rotation of the backstop 24 relative to the backstop side structure 23 around the backstop base end 24b, which is a rotation axis extending in the lateral direction Y. The support 27 supports the backstop 24 relative to the backstop side structure 23 so that a gap is formed between the back surface 23b of the backstop side structure and the backstop 24 (excluding the backstop base end 24b). The support 27 limits movement (swinging) of the backstop 24 in the lateral direction Y around the backstop base end 24b relative to the backstop side structure 23 (see Figure 3). The support 27 is attached (connected) to the backstop side structure 23 and the backstop 24.

[0034] The support 27 is attached to the backstop 24 at a position between the backstop base end 24b and the backstop tip end 24t. In the example shown in FIG. 2, the support 27 is attached to a portion of the tip-side backstop 25t near the spring 25a. The support 27 may be attached to the base-side backstop 25b. The support 27 has a shape with a longitudinal direction, for example, a substantially rod-like shape. The support 27 is provided so as to extend in a direction intersecting (for example, perpendicular or substantially perpendicular to) the backstop-side structure rear surface 23b. The support 27 may have a hollow structure or a solid structure. The support 27 may also include a pipe. The cross section of the support 27 as viewed in the longitudinal direction of the support 27 may be circular, polygonal (for example, rectangular), or substantially polygonal. When multiple backstops 24 are provided, a support 27 is provided for each of the multiple backstops 24. 2, two backstops 24 are provided, and two supports 27 are provided, one on each side (left and right) in the lateral direction Y. The support 27 is, for example, detachable from one or both of the backstop 24 and the backstop-side structure 23. The support 27 includes a support base end 27b and a support tip end 27t.

[0035] The support base end 27b is the end of the support 27 on the side attached to the backstop-side structure 23. When the support 27 has a shape having a longitudinal direction, the support base end 27b is the end of the support 27 on the side attached to the backstop-side structure 23 in the longitudinal direction of the support 27. As mentioned above, the terms "base end," "tip end," "end," etc. include not only the strict end but also the surrounding area of ​​the end.

[0036] The support tip portion 27t is the end portion of the support 27 that is attached to the backstop 24. The support tip portion 27t is the end portion of the support 27 that is opposite the support base portion 27b. When the support 27 has a shape that has a longitudinal direction, the support tip portion 27t is the end portion of the support 27 that is attached to the backstop 24 in the longitudinal direction of the support 27.

[0037] The backstop position adjustment device 30 is configured to be able to adjust the position of the backstop 24 in the lateral direction Y relative to the backstop side structure 23. Hereinafter, the adjustment of the position of the backstop 24 in the lateral direction Y relative to the backstop side structure 23 by the backstop position adjustment device 30 will also be referred to as "backstop position adjustment."

[0038] As shown in FIG. 3, the backstop position adjustment device 30 is provided on the support 27. For example, the backstop position adjustment device 30 is provided on the support tip 27t (the end of the support 27 on the backstop 24 side). The backstop position adjustment device 30 may be provided closer to the backstop-side structure 23 than the support tip 27t, for example, on the support base end 27b (see the backstop position adjustment device 430 shown in FIG. 15 (described later)). When a plurality of supports 27 are provided, a backstop position adjustment device 30 is provided for each support 27. In the example shown in FIG. 3, one support 27 is provided on each side (left and right) in the lateral direction Y (a total of two), and one backstop position adjustment device 30 is provided for each support 27 (a total of two for the two supports 27). Below, one backstop position adjustment device 30 will be described.

[0039] The backstop position adjustment by the backstop position adjustment device 30 is performed by a shim 70, for example, as shown in Fig. 10. Note that the backstop position adjustment by the backstop position adjustment device 30 does not have to be position adjustment by a shim 70 (shim adjustment), and may be position adjustment by a screw (bolt, etc.), for example. The following mainly describes the case where the backstop position adjustment is position adjustment by a shim 70. As shown in Fig. 4, the backstop position adjustment device 30 includes a first device 40, a second device 50, a connecting pin 61, a connecting pin removal prevention pin 62, a shim holding pin 63, a shim holding pin removal prevention pin 64, and a shim 70.

[0040] (Relationship between the first device 40 and the second device 50) The first device 40 and the second device 50 are configured as follows. The first device 40 and the second device 50 are configured so that the backstop position is adjusted by adjusting the position (relative position) of the second device 50 in the lateral direction Y with respect to the first device 40. The first device 40 is a device that includes a first bracket 43 to which a shim holding pin 63 is attached. The second device 50 is a device that does not require the shim holding pin 63 to be attached.

[0041] The first device 40 is connected to one of the backstop side structure 23 and the backstop 24 shown in FIG. 3. Specifically, the first device 40 is connected directly or indirectly to one of the backstop side structure 23 and the backstop 24 without going through the second device 50 and the backstop base end 24b (see FIG. 2). The second device 50 is connected to one of the backstop side structure 23 and the backstop 24 other than the one to which the first device 40 is connected. Specifically, the second device 50 is connected directly or indirectly to the one of the backstop side structure 23 and the backstop 24 other than the one to which the first device 40 is connected without going through the first device 40 and the backstop base end 24b (see FIG. 2).

[0042] In the example shown in FIG. 3, the first device 40 is connected to the backstop-side structure 23 without going through the second device 50 and the backstop base end 24b (see FIG. 2). In this case, the second device 50 is connected to the backstop 24 without going through the first device 40 and the backstop base end 24b (see FIG. 2). In the example shown in FIG. 3, the first device 40 is connected to the backstop-side structure 23 via the support 27. Specifically, the first device 40 is fixed to the support 27 (more specifically, the support tip 27t). Furthermore, the second device 50 is directly connected to (for example, fixed to) the backstop 24.

[0043] Also, the first device 40 may be connected to the backstop 24 without going through the second device 50 and the backstop base end 24b (see FIG. 2). In this case, the second device 50 is connected to the backstop-side structure 23 without going through the first device 40 and the backstop base end 24b. Specifically, for example, the backstop position adjustment device 30 shown in FIG. 3 may be disposed upside down in FIG. 3.

[0044] (direction) As shown in FIG. 10 , the backstop position adjustment device 30 includes an apparatus front-rear direction X, a lateral direction Y, and an apparatus up-down direction Z. As described above, the lateral direction Y is the direction in which the rotation axis of the backstop side structure 23 relative to the receiving member side structure 21 shown in FIG. 1 extends. As shown in FIG. 4 , one side in the lateral direction Y is the apparatus right side Yr, and the side opposite the apparatus right side Yr is the apparatus left side Yl. For one backstop position adjustment device 30, the side toward the center in the lateral direction Y (inner side) is the apparatus lateral inner side Yi, and the side opposite the apparatus lateral inner side Yi is the apparatus lateral outer side Yo. The apparatus vertical direction Z is a direction intersecting (e.g., perpendicular or nearly perpendicular to) the lateral direction Y and is the direction in which the first device 40 and the second device 50 face each other. For example, the apparatus vertical direction Z is the direction in which the first bracket support portion 41 (described below) and the second bracket 53 face each other. In the example shown in FIG. 2, the device up-down direction Z is the direction in which the backstop-side structure 23 and the backstop 24 face each other. In the example shown in FIG. 2, the device up-down direction Z is the longitudinal direction of the support 27. As shown in FIG. 4, in the device up-down direction Z, the side from the first device 40 (e.g., the first bracket support portion 41) toward the second device 50 is referred to as the device upper side Z2 (device second side). In the device up-down direction Z, the side from the second device 50 toward the first device 40 (e.g., the first bracket support portion 41) is referred to as the device lower side Z1 (device first side). The device front-rear direction X is a direction that intersects (e.g., perpendicular or substantially perpendicular to) both the lateral direction Y and the device up-down direction Z. As shown in FIG. 8, one side of the device up-down direction X is referred to as the device front side X1, and the side opposite the device front side X1 is referred to as the device rear side X2. The front side X1 of the device refers to, for example, the direction of movement of the shim 70 in the front-to-rear direction X of the device when the shim 70 is attached to the connecting pin 61. The rear side X2 of the device refers to, for example, the direction of movement of the shim 70 in the front-to-rear direction X of the device when the shim 70 is removed from the connecting pin 61. Note that the names of directions related to the backstop position adjustment device 30, such as up, down, front, rear, left, and right, are merely names used for convenience of explanation. For example, the up-down direction Z of the device may be vertical, may be inclined relative to the vertical, or may be horizontal. However, the lateral direction Y is usually horizontal or approximately horizontal.

[0045] As described above, the first device 40 is connected to one of the backstop-side structure 23 and the backstop 24 as shown in FIG. 3. In the example shown in FIG. 3, the first device 40 is connected to the backstop-side structure 23 via the support 27. For example, the first device 40 is fixed to the support tip 27t. As shown in FIG. 4, the first device 40 includes a first bracket support portion 41, a first bracket 43, and a welded portion 45.

[0046] The first bracket support portion 41 supports the first bracket 43. The first bracket support portion 41 is a portion (member) to which the first bracket 43 is fixed. In the example shown in FIG. 4, the first bracket support portion 41 is fixed to the support tip portion 27t. The first bracket support portion 41 is arranged to face the shim 70. For example, the first bracket support portion 41 is arranged to face the shim 70 in the device up-down direction Z. The first bracket support portion 41 is, for example, plate-shaped. The first bracket support portion 41 is arranged to extend in the lateral direction Y. In this example, the first bracket support portion 41 is arranged to extend in the lateral direction Y and the device front-rear direction X (see FIG. 8). The first bracket support portion 41 protrudes (sticks out) from the support tip portion 27t to the outside in the device lateral direction Yo. Note that the first bracket support portion 41 does not have to be plate-shaped and may be block-shaped or the like.

[0047] The first bracket 43 is a member to which the connecting pin 61 is attached. The first bracket 43 protrudes from the first bracket support portion 41 toward the upper side Z2 of the device. Two first brackets 43 are provided spaced apart in the horizontal direction Y (see the left first bracket 43L and the right first bracket 43R, which will be described later). The first bracket 43 is, for example, plate-shaped and is provided to extend in a direction intersecting the horizontal direction Y. The first bracket 43 has a pin hole into which the connecting pin 61 can be inserted. The first bracket 43 has a pin hole into which the shim holding pin 63 can be inserted.

[0048] The first bracket 43 is fixed to the first bracket support portion 41. The first bracket 43 is fixed (secured) to the first bracket support portion 41 by welding. Specifically, this welding is fillet welding. The first bracket 43 may also be fixed to the first bracket support portion 41 by a method other than welding. For example, the first bracket 43 may be fixed to the first bracket support portion 41 by a fastening member (e.g., a bolt, a nut) or the like. The surface of the first bracket 43 on the inner side Yi in the device lateral direction is referred to as the first bracket inner surface 43i. The first bracket 43 includes a left first bracket 43L and a right first bracket 43R.

[0049] The left-side first bracket 43L is one of two first brackets 43 provided at an interval in the horizontal direction Y. Of the two provided first brackets 43, the left-side first bracket 43L is the first bracket 43 that is arranged on the left side Yl of the device. Of the two provided first brackets 43, the right-side first bracket 43R is the one other than the left-side first bracket 43L. Of the two provided first brackets 43, the right-side first bracket 43R is the first bracket 43 that is arranged on the right side Yr of the device.

[0050] The welded portion 45 is a portion (specifically, a weld bead) formed by welding when the first bracket 43 is fixed to the first bracket support portion 41 by welding. The welded portion 45 is provided at the joint (corner portion) between the first bracket support portion 41 and the first bracket 43. The welded portion 45 is located on the upper side Z2 of the device relative to the first bracket support portion 41. The welded portion 45 is located (protrudes) on the inner side Yi of the device in the lateral direction relative to the first bracket inner surface 43i. The welded portion 45 is an example of an object A1 near the support portion, which will be described later.

[0051] As described above, the second device 50 is connected to one of the backstop-side structure 23 and the backstop 24, which is different from the one to which the first device 40 is connected. In the example shown in Figure 3, the second device 50 is connected to the backstop 24. As shown in Figure 4, the second device 50 includes a second bracket 53.

[0052] The second bracket 53 is a member to which the connecting pin 61 is attached. The second bracket 53 faces the first bracket 43 in the lateral direction Y. The second bracket 53 protrudes from a member supporting the second bracket 53 toward the device lower side Z1. In the example shown in FIG. 4, the "member supporting the second bracket 53" is the backstop 24. In this example, the second bracket 53 is fixed to the backstop 24. The second bracket 53 may be fixed to the distal backstop 25t shown in FIG. 2 or to the proximal backstop 25b. As shown in FIG. 4, a plurality of second brackets 53 may be provided, for example, two brackets 53 may be provided spaced apart in the lateral direction Y. Only one second bracket 53 may be provided. The second bracket 53 is disposed between the plurality of first brackets 43 in the lateral direction Y. The second bracket 53 is disposed on the inner side Yi of the device relative to the first bracket 43. The second bracket 53 may also be disposed on the outer side Yo of the device relative to the first bracket 43 in the lateral direction Y. The second bracket 53 is, for example, in the shape of a plate, and is provided so as to extend in a direction intersecting with the lateral direction Y. The second bracket 53 has a pin hole into which the connecting pin 61 can be inserted.

[0053] The connecting pin 61 is a pin that connects the first bracket 43 and the second bracket 53. In the example shown in FIG. 2, the connecting pin 61 (see FIG. 4) connects the support 27 and the backstop 24. As shown in FIG. 4, the connecting pin 61 is attached to the first bracket 43 and the second bracket 53. The connecting pin 61 is inserted into a pin hole in the first bracket 43 and a pin hole in the second bracket 53. The connecting pin 61 is a cylindrical or approximately cylindrical member. While attached (inserted) to the first bracket 43 and the second bracket 53, the connecting pin 61 is held in place by, for example, a connecting pin removal prevention pin 62.

[0054] The connecting pin retaining pin 62 is a pin that prevents the connecting pin 61 from coming out of the first bracket 43 and the second bracket 53. In the example shown in FIG. 4, the connecting pin retaining pin 62 is attached to both ends of the connecting pin 61 in the longitudinal direction (axial direction, lateral direction Y). Note that, in cases such as when the diameter of one end of the connecting pin 61 in the longitudinal direction is larger than the diameter of the pin hole in the first bracket 43, the connecting pin retaining pin 62 only needs to be attached to the other end of the connecting pin 61 in the longitudinal direction (the end opposite to the above-mentioned "one end"). In the example shown in FIG. 6, the connecting pin retaining pin 62 is a split pin (the same applies to the shim retaining pin retaining pin 64).

[0055] The shim holding pin 63 is a pin (fixing pin) that holds the shim 70 relative to the first bracket 43. As will be described later, the shim holding pin 63 holds the shim 70 relative to the first bracket 43 with the shim recess 73 attached to the connecting pin 61. The shim holding pin 63 is attached to the first bracket 43 and the shim 70. The shim holding pin 63 is inserted into a pin hole in the first bracket 43 and a shim holding pin pin hole 75 (described later) in the shim 70. In the example shown in FIG. 6 , the shim holding pin 63 is positioned closer to the rear side X2 of the device than the connecting pin 61. The shim holding pin 63 is a cylindrical or approximately cylindrical member. The diameter of the shim holding pin 63 is smaller than the diameter of the connecting pin 61. For example, if the diameter of the connecting pin 61 is 30 mm, the diameter of the shim holding pin 63 is 10 mm. Note that these dimensions are merely examples and may be varied in various ways. The shim holding pin 63 is held in place by, for example, a shim holding pin removal prevention pin 64 while attached (inserted) to the first bracket 43 and the shim 70.

[0056] The shim retaining pin removal pin 64 is a pin that prevents the shim retaining pin 63 from coming off the first bracket 43 and the shim 70. In the example shown in Fig. 4, the shim retaining pin removal pin 64 is attached to both ends in the longitudinal direction (axial direction, lateral direction Y) of the shim retaining pin 63. Note that the shim retaining pin removal pin 64 may be attached to only one end in the longitudinal direction of the shim retaining pin 63 (similar to the connecting pin removal pin 62).

[0057] The shim 70 is disposed between the first bracket 43 and the second bracket 53 in the lateral direction Y. The shim 70 is for adjusting the position of the second bracket 53 in the lateral direction Y relative to the first bracket 43. The shim 70 maintains the position of the second bracket 53 in the lateral direction Y relative to the first bracket 43 in a state in which the position of the second bracket 53 in the lateral direction Y relative to the first bracket 43 has been adjusted.

[0058] The shim 70 is disposed, for example, at both or one of the left shim position S70l and the right shim position S70r. The left shim position S70l is a position (area, space) between the left first bracket 43L and the second bracket 53 (e.g., the second bracket 53 on the left side Yl of the device) in the horizontal direction Y. The right shim position S70r is a position between the right first bracket 43R and the second bracket 53 (e.g., the second bracket 53 on the right side Yr of the device) in the horizontal direction Y. The shim 70 contacts or is close to the first bracket inner surface 43i (is disposed immediately adjacent to the first bracket inner surface 43i). The shim 70 contacts or is close to the surface of the second bracket 53 on the first bracket 43 side.

[0059] The shim 70 is a plate-shaped member. A plurality of shims 70 are provided in one backstop position adjustment device 30. The shapes of the plurality of shims 70 when viewed in the thickness direction (horizontal direction Y) of the shims 70 are the same (match) (see FIG. 10). A plurality of thicknesses of the shims 70 are set. The number of shims 70 and the thickness of the shims 70 can be set in various ways. In the example shown in FIG. 4, there are six thick shims 70 (e.g., 12 mm thick), four medium-thick shims 70 (e.g., 6 mm thick), and two thin shims 70 (e.g., 3.2 mm thick).

[0060] The shim 70 is attached to the first bracket 43. More specifically, the shim 70 is attached to the first bracket 43 via a connecting pin 61. When attached to the first bracket 43, the shim 70 is held by a shim holding pin 63. The state in which the shim 70 is attached to the first bracket 43 is also referred to as a "shim attached state." The shim attached state is, for example, a state in which the shim 70 is held to the first bracket 43 by the shim holding pin 63. Unless otherwise specified, the following description will be given assuming that the shim 70 is in the shim attached state.

[0061] When the shim 70 is in the shim-attached state, a gap S70z (more specifically, the gap S70z in the device up-down direction Z) is provided between the shim 70 and the first bracket support portion 41. More specifically, the shim 70 is held to the first bracket 43 by the shim holding pin 63 with the gap S70z provided between the shim 70 and the first bracket support portion 41 (floating from the first bracket support portion 41). Here, a support-nearby object A1 may be present near the first bracket support portion 41. For example, the support-nearby object A1 protrudes from the support-nearby object A1 toward the device upper side Z2. The support-nearby object A1 is disposed, for example, between the support-nearby object A1 and the shim 70. Specifically, the support-nearby object A1 is, for example, a welded portion 45. Even when an object A1 near the support portion is present, a gap S70z is provided between the shim 70 and the first bracket support portion 41, so the shim 70 can be attached to the first bracket 43 without interfering with the object A1 near the support portion.

[0062] As shown in FIG. 7, the shim 70 (more specifically, each of the plurality of shims 70) includes a shim main body 71, a shim recess 73, and a pin hole 75 for a shim holding pin.

[0063] The shim main body 71 is the main body portion of the shim 70. For example, the shim main body 71 is the portion of the shim 70 excluding the shim recess 73 and the pin hole 75 for the shim holding pin.

[0064] As shown in FIG. 6 , the shim recess 73 is a portion that is attached to the connecting pin 61. As shown in FIG. 8 , the shim recess 73 is configured so that the shim 70 can be attached to the connecting pin 61 when the connecting pin 61 is attached (inserted) to the first bracket 43 and the second bracket 53. Specifically, the shim recess 73 has a concave shape. The concave shape of the shim recess 73 is such that the shim recess 73 can be attached to and detached from the connecting pin 61 in the radial direction of the connecting pin 61. More specifically, the concave shape of the shim recess 73 is such that the shim recess 73 can be attached (inserted, fitted) to the connecting pin 61 from a position that is radially outer than the connecting pin 61. The concave shape of the shim recess 73 is such that the shim recess 73 can be detached from the connecting pin 61 radially outer than the connecting pin 61. 7, the concave shape of the shim recess 73, when viewed in the thickness direction (horizontal direction Y) of the shim 70, is a shape that is recessed from the outer periphery of the shim main body 71 toward the inside of the shim 70. For example, the concave shape of the shim recess 73, when viewed in the thickness direction of the shim 70, is a shape that is recessed from the outer periphery of the shim main body 71 toward the rear side X2 of the device and the upper side Z2 of the device.

[0065] It should be noted that the shim recess 73 does not necessarily have to be provided. For example, the shim 70 shown in FIG. 4 may be disposed between the first bracket 43 and the second bracket 53 without being attached to the connecting pin 61. Furthermore, the shim 70 may be provided with a pin hole into which the connecting pin 61 can be inserted, instead of the shim recess 73 (see FIG. 7). In this case, the connecting pin 61 may be inserted into the shim 70 in a state in which the connecting pin 61 has been removed from the first bracket 43 and the second bracket 53.

[0066] As shown in Fig. 10, the pin hole 75 for the shim retaining pin is a pin hole into which the shim retaining pin 63 is inserted. In the example shown in Fig. 6, the pin hole 75 for the shim retaining pin is located closer to the rear side X2 of the device than the shim recess 73. For example, the pin hole 75 for the shim retaining pin is located at the end of the shim 70 on the rear side X2 of the device. Note that one of the pin hole 75 for the shim retaining pin of the shim 70 and the pin hole for the shim retaining pin 63 of the first bracket 43 may be slightly larger than the other.

[0067] (lateral Y deviation of backstop 24) As described above, as shown in FIG. 2, the backstop tip 24t is received by the receiving member 21a. However, there may be a large misalignment in the lateral direction Y between the backstop tip 24t and the receiving member 21a. In this case, for example, the backstop tip 24t may come into contact with the receiving member 21a and get caught when sliding along the rail portion 21a1. In this case, the backstop tip 24t may not slide smoothly against the receiving member 21a. As such, the operation of the backstop 24 may become unstable.

[0068] (Backstop position adjustment) Therefore, the position of the backstop 24 in the lateral direction Y relative to the backstop-side structure 23 is adjusted by the backstop position adjustment device 30 (backstop position adjustment is performed). In the backstop position adjustment, adjustment is performed so that the deviation of the backstop tip 24t in the lateral direction Y relative to the receiving member 21a is minimized. As a result, the deviation of the backstop tip 24t in the lateral direction Y relative to the receiving member 21a is suppressed (the amount of deviation is reduced).

[0069] In this embodiment, as shown in FIG. 4, the backstop position is adjusted using shims 70. A specific example of the backstop position adjustment in this case is as follows. For example, the backstop 24 is moved in the lateral direction Y relative to the backstop-side structure 23 shown in FIG. 2 by an auxiliary crane or the like. At this time, the backstop 24 is moved so that the deviation of the backstop tip 24t in the lateral direction Y relative to the receiving member 21a is minimized. In this state, as shown in FIG. 4, shims 70 having a thickness and number corresponding to the distance between the first bracket 43 and the second bracket 53 are arranged between the first bracket 43 and the second bracket 53 (a specific example of the arrangement will be described later). Specifically, the thickness and number of shims 70 arranged at the left shim arrangement position S70l and the thickness and number of shims 70 arranged at the right shim arrangement position S70r are adjusted. For example, in the example shown in Figure 4, the thickness and number of shims 70 arranged at the left shim arrangement position S70l are the same as the thickness and number of shims 70 arranged at the right shim arrangement position S70r. [Adjustment Example A] In the example shown in Figure 5, all shims 70 are arranged at the left shim arrangement position S70l. No shims 70 are arranged at the right shim arrangement position S70r. [Adjustment Example B] Contrary to the above [Adjustment Example A], all shims 70 may be arranged at the right shim arrangement position S70r, and no shims 70 may be arranged at the left shim arrangement position S70l. The backstop position can be adjusted within the range between the above [Adjustment Example A] and [Adjustment Example B].

[0070] By disposing the shim 70 between the first bracket 43 and the second bracket 53, the position of the backstop 24 in the lateral direction Y relative to the backstop-side structure 23 shown in Fig. 2 is maintained. At this time, the position of the backstop 24 in the lateral direction Y relative to the backstop-side structure 23 is maintained at a position that minimizes the deviation of the backstop tip 24t in the lateral direction Y relative to the receiving member 21a.

[0071] (Example of how to install Shim 70) A specific example of a method for attaching the shim 70 between the first bracket 43 and the second bracket 53 shown in FIG. 10 is as follows.

[0072] In the state shown in Fig. 8, the connecting pin 61 is attached (inserted) to the first bracket 43 and the second bracket 53, and the shim 70 is not disposed between the first bracket 43 and the second bracket 53. In Fig. 8, the left first bracket 43L is shown by an imaginary line (two-dot chain line).

[0073] 8, the shim 70 is disposed radially outward of the connecting pin 61. Specifically, the shim 70 is disposed on the rear side X2 of the device relative to the connecting pin 61. The shim recess 73 faces the connecting pin 61.

[0074] As shown in Fig. 9, multiple shims 70 are attached to the connecting pin 61. The shim recesses 73 are attached (inserted or fitted) to the connecting pin 61. In the state shown in Fig. 9, the pin holes of the shim holding pins 63 (see Fig. 10) of the first bracket 43 and the shim holding pin pin holes 75 of the shims 70 are not aligned.

[0075] 10, the pin hole of the shim holding pin 63 of the first bracket 43 is aligned with the shim holding pin pin hole 75 of the shim 70 ("aligning the pin hole of the shim holding pin 63" is performed). The shim holding pin 63 is attached (inserted) into these pin holes.

[0076] The alignment of the pin hole of the shim holding pin 63 may be performed by an operator manually moving the shim 70. A backing material 80 shown in FIG. 4 may be used to align the pin hole of the shim holding pin 63. The backing material 80 is placed in the gap S70z between the first bracket 43 and the shim 70. The backing material 80 is configured so that, when the shim 70 is in contact with the backing material 80, the pin hole of the shim holding pin 63 of the first bracket 43 is aligned with the shim holding pin pin hole 75 (see FIG. 10) of the shim 70. Use of the backing material 80 makes it easier to align the pin hole of the shim holding pin 63.

[0077] (Effect when backstop position adjustment is performed at the tip of the support (27t)) 3, in this embodiment, the backstop position adjustment device 30 is provided at the support tip 27t (that is, the backstop position adjustment is performed at the support tip 27t). The effect of this arrangement will be described.

[0078] Here, as shown in FIG. 15 , there is a case where the backstop position adjustment device 430 is provided on the support 27 closer to the backstop-side structure 23 (for example, the support base end 27b) than the support tip end 27t (details will be described later). In this case, when the backstop position is adjusted, the support 27 (the support 27 itself, together with the support 27) moves in the lateral direction Y relative to the backstop-side structure 23. It is also assumed that a support nearby object A2 is disposed near the support 27. For example, the support nearby object A2 is disposed in a position facing the support 27 in the lateral direction Y. In this case, when the support 27 moves in the lateral direction Y, the support 27 and the support nearby object A2 interfere with each other. As a result, the support 27 cannot be moved, or the range in which the support 27 can be moved is limited. This makes it impossible or difficult to adjust the backstop position. For example, the support nearby object A2 is an object that is part of the work machine 10 (a part, a structure, etc.). The object A2 near the support is a winch (for example, the jib hoisting winch 18w in the example shown in FIG. 1) in the example shown in FIG. 3. The object A2 near the support may also be an object other than a winch.

[0079] Therefore, in the example shown in FIG. 3, the backstop position adjustment device 30 is provided at the support tip 27t. Therefore, when the backstop position is adjusted, the second device 50 and the backstop 24 move in the lateral direction Y relative to the first device 40 and the support 27. Therefore, when the backstop position is adjusted, it is not necessary to move the support 27 in the lateral direction Y. Therefore, even if an object A2 near the support is present near the support 27, interference between the support 27 and the object A2 near the support is suppressed (for example, there is no interference). Therefore, the backstop position can be adjusted even if the object A2 near the support is present. Note that when the object A2 near the support is not present, the backstop position adjustment may be performed at the backstop tip 24t.

[0080] (Effects of the first invention) The effects of the backstop device 20 shown in Figure 2 are as follows: The backstop device 20 comprises a receiving member side structure 21 (see Figure 1), a backstop side structure 23, a backstop 24, a support 27, and a backstop position adjustment device 30. The receiving member side structure 21 is a structure of the work machine 10, and is a structure that has a receiving member 21a.

[0081] [Configuration 1-1] As shown in Fig. 1, the backstop side structure 23 is a structure of the work machine 10, and is attached to the receiving member side structure 21, and is a structure that is rotatable about a rotation axis that extends in the lateral direction Y relative to the receiving member side structure 21. As shown in Fig. 2, the backstop 24 is attached to the backstop side structure 23. The backstop 24 is configured to be received by the receiving member 21a, thereby limiting the rotation of the backstop side structure 23 relative to the receiving member side structure 21.

[0082] [Configuration 1-2] The support 27 is attached to the backstop-side structure 23 and the backstop 24. The support 27 supports the backstop 24 at a predetermined position relative to the backstop-side structure 23. The backstop position adjustment device 30 is provided on the support 27 and is configured to be able to adjust the position of the backstop 24 in the lateral direction Y relative to the backstop-side structure 23 (see Figure 4).

[0083] In the above [Configuration 1-1], as shown in FIG. 1, the backstop-side structure 23 is a structure rotatably attached to the receiving member-side structure 21 having the receiving member 21a around a rotation axis extending in the lateral direction Y. The backstop 24 attached to this backstop-side structure 23 is configured to be received by the receiving member 21a. In this configuration, as shown in FIG. 2, when the backstop-side structure 23 rotates with respect to the receiving member-side structure 21, the position of the backstop 24 in the lateral direction Y relative to the receiving member 21a may shift. Therefore, in the above [Configuration 1-2], the backstop position adjustment device 30 is configured to be able to adjust the position of the backstop 24 in the lateral direction Y relative to the backstop-side structure 23 (backstop position adjustment). Therefore, when the backstop position adjustment is performed appropriately, it is possible to suppress shifting of the backstop 24 in the lateral direction Y relative to the receiving member 21a.

[0084] (Effects of the second invention) [Configuration 2] As shown in FIG. 3, the backstop position adjusting device 30 is provided at the end of the support 27 on the backstop 24 side (support tip 27t).

[0085] According to the above [Configuration 2], the backstop position adjustment is performed at the support tip 27t. Therefore, when the backstop position adjustment is performed, there is no need to move the support 27 in the lateral direction Y. Therefore, even if an object A2 near the support exists near the support 27, the support 27 and the object A2 near the support do not interfere with each other, or interference is suppressed. Therefore, even if an object A2 near the support exists near the support 27, the backstop position adjustment can be performed.

[0086] (Effect of the third invention) As shown in Fig. 4, the backstop position adjustment device 30 includes a first bracket 43, a second bracket 53, and a shim 70. As shown in Fig. 3, the first bracket 43 (see Fig. 4) is connected to one of the backstop side structure 23 and the backstop 24. The second bracket 53 (see Fig. 4) is connected to one of the backstop side structure 23 and the backstop 24, which is different from the one to which the first bracket 43 is connected. As shown in Fig. 4, the second bracket 53 faces the first bracket 43 in the lateral direction Y.

[0087] [Configuration 3] The shim 70 is a plate-shaped member that is placed between the first bracket 43 and the second bracket 53 in the horizontal direction Y to adjust the position of the second bracket 53 in the horizontal direction Y relative to the first bracket 43.

[0088] In the above [Configuration 3], the backstop position can be adjusted by the simple task of changing the configuration (e.g., the number and thickness of the shims 70) of the shims 70 arranged between the first bracket 43 and the second bracket 53 in the horizontal direction Y.

[0089] (Effect of the fourth invention) The backstop position adjustment device 30 includes a connecting pin 61. The connecting pin 61 is a pin that connects the first bracket 43 and the second bracket 53 together.

[0090] 6, the shim 70 has a shim recess 73. The shim recess 73 has a recessed shape that allows it to be attached to the connecting pin 61 from a position radially outward of the connecting pin 61.

[0091] In the above-described [Configuration 4], the shim recess 73 of the shim 70 is attached to the connecting pin 61. Therefore, compared to when the shim 70 shown in FIG. 3 is simply disposed between the first bracket 43 and the second bracket 53, movement of the shim 70 between the first bracket 43 and the second bracket 53 can be suppressed. Specifically, by attaching the shim recess 73 to the connecting pin 61, movement of the shim 70 in one or both of the device up-down direction Z and the device front-rear direction X can be restricted, but movement of the shim 70 in a direction other than the direction in which the shim recess 73 is removed from the connecting pin 61 can be restricted. Furthermore, in the above-described [Configuration 4], as shown in FIG. 8 , the shim recess 73 has a recessed shape that allows it to be attached to the connecting pin 61 from a position radially outward of the connecting pin 61. Therefore, the shim 70 can be attached (inserted or fitted) to the connecting pin 61 while the connecting pin 61 remains attached to the first bracket 43 and the second bracket 53 (without removing the connecting pin 61). Therefore, the operation of adjusting the backstop position using the shim 70 becomes easier.

[0092] (Effect of the fifth invention) 10, the backstop position adjustment device 30 includes a shim holding pin 63. The shim holding pin 63 is attached to the first bracket 43 and the shim 70 with the shim recess 73 attached to the connecting pin 61, thereby holding the shim 70 relative to the first bracket 43.

[0093] The above [Configuration 5] provides the following effect. In the above [Configuration 4], the shim recess 73 can be attached to the connecting pin 61 from a position radially outside the connecting pin 61. Therefore, the shim recess 73 can also be removed from the connecting pin 61 radially outside the connecting pin 61. Therefore, the backstop position adjustment device 30 includes the shim retaining pin 63 of the above [Configuration 5]. Therefore, the shim retaining pin 63 can maintain the state in which the shim recess 73 is attached to the connecting pin 61. As a result, even in a configuration in which the shim 70 can be easily attached to the connecting pin 61, the shim 70 can be reliably retained between the first bracket 43 and the second bracket 53.

[0094] (Effect of the sixth aspect of the invention) 4, the backstop position adjustment device 30 includes a first bracket support portion 41 and a shim holding pin 63. The first bracket support portion 41 has the first bracket 43 fixed thereto, supports the first bracket 43, and is disposed so as to face the shim 70. The shim holding pin 63 is a pin attached to the first bracket 43 and the shim 70.

[0095] [Configuration 6] The shim 70 is held on the first bracket 43 by the shim holding pin 63 with a gap S70z between the shim 70 and the first bracket support portion 41.

[0096] The above [Configuration 6] provides the following effect: It is assumed that an object A1 (e.g., welded portion 45) is present between the first bracket support portion 41 and the shim 70. Even in this case, the shim 70 can be held on the first bracket 43 by the shim holding pin 63 while suppressing interference between the object A1 near the support portion and the shim 70 (while the shim 70 avoids the object A1 near the support portion).

[0097] (Second embodiment) 11 and 12, the differences between the backstop position adjustment device 230 of the backstop device 220 of the second embodiment and the first embodiment will be described. Note that, among the backstop device 220 of the second embodiment, the description of the common points with the first embodiment will be omitted. The same applies to the descriptions of the other embodiments described later.

[0098] In the example shown in Fig. 4, the welded portion 45 was disposed (protruded) on the inside Yi of the first bracket inner surface 43i in the lateral direction of the device. On the other hand, as shown in Fig. 11, in this embodiment, the welded portion 245 is not (does not protrude) on the inside Yi of the first bracket inner surface 43i in the lateral direction of the device, or is almost not present. Also, as shown in Fig. 12, the shape of the shim 270 is different from the shape of the shim 70 shown in Fig. 6. The details of the differences are as follows.

[0099] 11, the first bracket 43 is fixed to the first bracket support portion 41 by groove welding the first bracket inner surface 43i and the first bracket support portion 41. The first bracket 43 has a groove 243a.

[0100] The groove 243a is provided to prevent the welded portion 245 from being positioned (protruding) further inward in the device lateral direction Yi than the first bracket 43. The groove 243a is provided at the joint (corner) between the first bracket 43 and the first bracket support portion 41. The groove 243a is provided on the surface of the first bracket 43 on the inner side Yi in the device lateral direction (on the second bracket 53 side) of the end portion on the device lower side Z1. The groove 243a is recessed toward the outer side Yo in the device lateral direction with respect to the first bracket inner surface 43i.

[0101] The weld 245 is provided at the joint (corner) between the first bracket support part 41 and the first bracket 43. The weld 245 is provided inside the groove 243a of this joint. The weld 245 is provided at a position where it does not protrude from the first bracket inner surface 43i toward the inside in the device lateral direction Yi. Specifically, the position in the lateral direction Y of the end of the weld 245 on the inside in the device lateral direction Yi is the same as the position in the lateral direction Y of the first bracket inner surface 43i (excluding the groove 243a), or is a position on the outside in the device lateral direction Yo. In the example shown in FIG. 11, the weld 245 does not protrude from the first bracket inner surface 43i toward the inside in the device lateral direction Yi. Therefore, an object A1 (see FIG. 4) near the support part does not exist. The welded portion 245 may be provided at a position that does not substantially protrude from the first bracket inner surface 43i toward the inside Yi in the device lateral direction (it may be in a state where there is almost no object A1 (see FIG. 4) near the support portion).

[0102] The shim 270 is configured as follows. In the example shown in FIG. 4, the shim 70 in the shim-attached state is in a state in which a gap S70z is provided between the shim 70 and the first bracket support portion 41. On the other hand, as shown in FIG. 11, in this embodiment, the shim 270 in the shim-attached state is in contact with the first bracket support portion 41 (this arrangement is also referred to as a "shim 270 contact arrangement"). More specifically, a plurality of shims 270 are provided, and all of the shims 270 are in contact with the first bracket support portion 41 in the shim-attached state. This shim 270 contact arrangement is possible because there is no or almost no object (support portion nearby object A1 (see FIG. 4)) that interferes with the shim 270 between the first bracket support portion 41 and the shim 270. For example, when the first bracket support portion 41 and the first bracket 43 are fixed by welding, the welded portion 245 does not protrude (or does not protrude much) from the inner surface 43i of the first bracket to the lateral inner side Yi of the device, making this shim 270 contact arrangement possible.

[0103] This contact arrangement of the shim 270 facilitates alignment of the pin hole of the shim holding pin 63. More specifically, before the shim holding pin 63 is attached to the first bracket 43 and the shim 270, the shim 270 is brought into contact with the first bracket support portion 41. This aligns the pin hole of the shim holding pin 63 of the first bracket 43 with the shim holding pin pin hole 75 of the shim 270, as shown in FIG. 12 . This facilitates alignment of the pin hole of the shim holding pin 63.

[0104] Furthermore, it is preferable that the shim 270 contacts the first bracket support part 41 (automatically) due to the weight of the shim 270. In this case, for example, it is not necessary for an operator to manually move the shim 270 to contact the first bracket support part 41. This makes it easier to align the pin hole of the shim holding pin 63. For example, when the shim recess 73 is attached to the connecting pin 61, the shim 270 maintains a state of contact with the first bracket support part 41 due to the weight of the shim 270. In this state, the shim 270 is held to the first bracket 43 by the shim holding pin 63.

[0105] It is preferable that the outer shape of at least half of the shim 270 when viewed from the lateral direction Y (thickness direction of the shim 270) be the same as (match) the outer shape of the first bracket 43 when viewed from the lateral direction Y. Hereinafter, the outer shapes of the shim 270 and the first bracket 43 will be referred to as the outer shapes when viewed from the lateral direction Y. The "outer shape of the shim 270" refers to the shape of the lines (contour lines, boundary lines, e.g., outer and inner periphery lines) that form the periphery of the shim 270. Specifically, the outer shape of the shim 270 includes the shape of the contour line (outer periphery) of the shim main body 71 and the shape of the contour line (U-shaped in the figure) of the shim recess 73. The "outer shape of at least half of the shim 270" refers to the shape of at least half of the line (contour line, etc.) that forms the periphery of the shim 270. For example, the "outer shape of at least half of the shim 270" refers to the shape of a portion of the contour line around the shim 270 that is at least half the total length of the contour line. The outer shape of the "first bracket 43" is the shape of the line (outline, etc.) that forms the periphery of the first bracket 43.

[0106] For example, the outer shape of the shim 270 excluding the shim recess 73 is the same as the outer shape of the first bracket 43. In the example shown in Fig. 12, the outer shape of the shim main body 71 is the same as the outer shape of the first bracket 43. Note that in Fig. 12, to make it easier to distinguish the outer shape of the shim 270, the portion of the outer shape of the shim 270 that overlaps with the outer shape of the first bracket 43 is illustrated slightly shifted relative to the outer shape of the first bracket 43 (the same applies to Fig. 14).

[0107] 12, the outline of the portion of the shim recess 73 that follows the outer periphery of the connecting pin 61 (the bottom of the shim recess 73) and a portion of the pinhole of the connecting pin 61 of the first bracket 43 (a portion not included in the "outer shape of the first bracket 43") are the same or substantially the same. Also, in the example shown in FIG. 12, the pinhole 75 for the shim retaining pin of the shim 270 (a portion not included in the "outer shape of the shim 270") and the pinhole of the shim retaining pin 63 of the first bracket 43 (a portion not included in the "outer shape of the first bracket 43") are the same or substantially the same.

[0108] (Effect of the seventh invention) The backstop device 220 shown in FIG. 11 has the following effects.

[0109] The backstop position adjustment device 230 includes a first bracket support portion 41 and a shim holding pin 63. The first bracket support portion 41 has the first bracket 43 fixed thereto, supports the first bracket 43, and is disposed so as to face the shim 270. The shim holding pin 63 is a pin attached to the first bracket 43 and the shim 270.

[0110] [Configuration 7] The shim 270 is held to the first bracket 43 by the shim holding pin 63 while in contact with the first bracket support portion 41.

[0111] In the above [Configuration 7], the pinholes of the shim holding pin 63 of the first bracket 43 and the shim 270 can be aligned simply by bringing the shim 270 into contact with the first bracket support portion 41. This facilitates alignment of the pinhole of the shim holding pin 63. As a result, the operation of holding the shim 270 on the first bracket 43 with the shim holding pin 63 becomes easier.

[0112] (Effect of the eighth invention) [Configuration 8] The first bracket 43 is fixed to the first bracket support portion 41 by groove welding the surface of the first bracket 43 facing the second bracket 53 (the first bracket inner surface 43i) to the first bracket support portion 41.

[0113] The above [Configuration 8] prevents the welded portion 245 from protruding from the first bracket inner surface 43i toward the second bracket 53 (the inner side Yi in the device lateral direction). This prevents the shim 270 from interfering with the welded portion 245. Therefore, even when the first bracket support portion 41 and the first bracket 43 are fixed by welding, the shim 270 can be reliably brought into contact with the first bracket support portion 41 (see the above [Configuration 7]).

[0114] (Effect of the 10th invention) [Configuration 10] As shown in FIG. 12, more than half of the outer shape of the shim 270 when viewed in the thickness direction (lateral direction Y) is the same as the outer shape of the first bracket 43 when viewed in the lateral direction Y.

[0115] The above [Configuration 10] makes it easy to manufacture the shim 270 and the first bracket 43 from a common member, thereby reducing the manufacturing cost of the backstop position adjustment device 230.

[0116] (Effects of the eleventh invention) As shown in FIG. 11 , the backstop position adjustment device 230 includes a connecting pin 61, a first bracket support portion 41, and a shim holding pin 63. The connecting pin 61 is a pin that connects the first bracket 43 and the second bracket 53. The first bracket support portion 41 is fixed to the first bracket 43, supports the first bracket 43, and is disposed so as to face the shim 70. The shim holding pin 63 is a pin that is attached to the first bracket 43 and the shim 270. As shown in FIG. 12 , the shim 270 includes a shim recess 73.

[0117] [Configuration 11] The shim recess 73 has a recessed shape that allows it to be attached to the connecting pin 61 from a position radially outward of the connecting pin 61. The shim 270 is attached to the connecting pin 61 with the shim recess 73 in contact with the first bracket support part 41, and is held to the first bracket 43 by the shim holding pin 63. More than half of the outer shape of the shim 270 when viewed from the thickness direction (lateral direction Y) is the same as the outer shape of the first bracket 43 when viewed from the lateral direction Y.

[0118] In the above [Configuration 11], the shim 270 is held in the first bracket 43 by the shim holding pin 63 with the shim recess 73 attached to the connecting pin 61. Therefore, even in a configuration in which the shim 270 can be easily attached to the connecting pin 61, the shim 270 can be reliably held between the first bracket 43 and the second bracket 53 (see the effect of the above [Configuration 5]). Furthermore, in the above [Configuration 11], the shim 270 is held in the first bracket 43 by the shim holding pin 63 while in contact with the first bracket support portion 41. Therefore, it is easy to align the pin holes of the shim holding pin 63 in the first bracket 43 and the shim 270 (see the effect of the above [Configuration 7]). Furthermore, in the above [Configuration 11], the outer shape of more than half of the shim 270 when viewed from the thickness direction (lateral direction Y) is the same as the outer shape of the first bracket 43 when viewed from the lateral direction Y. This makes it easy to make the shim 270 and the first bracket 43 from a common member, which in turn reduces the manufacturing costs of the backstop position adjustment device 230 (see the effect of [Configuration 10] above). This makes it easy to attach and hold the shim 270 in a position between the first bracket 43 and the second bracket 53, and also makes it easy to make the shim 270 and the first bracket 43 from a common member.

[0119] (Third embodiment) 13 and 14, differences between the backstop position adjustment device 330 of the backstop device 320 of the third embodiment and the first and second embodiments will be described. In this embodiment, the welded portion 45 protrudes further inward in the device lateral direction Yi than the first bracket inner surface 43i, as in the example shown in FIG. 4. The shim 270 in the shim-attached state contacts the first bracket support portion 41, as in the example shown in FIG. 11. As shown in FIG. 13, the backstop device 320 includes a spacer 380.

[0120] The spacer 380 is a member for enabling the shim 270 in the shim-attached state to contact the first bracket support part 41 while suppressing interference between the support-proximate object A1 (e.g., the welded part 45) and the shim 270. The spacer 380 is provided on the first bracket inner surface 43i (the surface of the first bracket 43 facing the second bracket 53). The spacer 380 may be fixed to the first bracket inner surface 43i or may be detachably attached to the first bracket inner surface 43i. The spacer 380 does not have to be attached to the first bracket inner surface 43i, but may simply be in contact with it. The spacer 380 is disposed with a gap S380z (more specifically, the gap S380z in the device up-down direction Z) between it and the first bracket support part 41. The length (width, thickness) of the spacer 380 in the lateral direction Y is set to a thickness that can suppress interference between the support-proximate object A1 and the shim 270. For example, suppose that an object A1 (e.g., a welded portion 45) protrudes from the first bracket inner surface 43i toward the inside Yi in the lateral direction of the device. In this case, the length of the spacer 380 in the lateral direction Y is equal to or greater than the amount by which the object A1 (e.g., a welded portion 45) protrudes from the first bracket inner surface 43i toward the inside Yi in the lateral direction of the device. For example, as shown in FIG. 14, the spacer 380 may be disposed around the pin hole of the connecting pin 61 of the first bracket 43 (or may be a boss). Note that the spacer 380 may be similar to the shim 70 having the shim recess 73 shown in FIG. 6. Specifically, the spacer 380 shown in FIG. 13 may be detachable from the connecting pin 61 when the connecting pin 61 is attached to the first bracket 43 and the second bracket 53.

[0121] (Effect of the ninth invention) 13 has the following effects. The backstop position adjustment device 330 includes a first bracket support portion 41, a shim holding pin 63, and a spacer 380. The first bracket support portion 41 has the first bracket 43 fixed thereto, supports the first bracket 43, and is positioned so as to face the shim 70. The shim holding pin 63 is a pin attached to the first bracket 43 and the shim 70.

[0122] [Configuration 9] The spacer 380 is provided on the surface of the first bracket 43 facing the second bracket 53 (first bracket inner surface 43i). The spacer 380 is disposed with a gap between it and the first bracket support part 41. The shim 70 is held to the first bracket 43 by the shim holding pin 63 while in contact with the first bracket support part 41.

[0123] The above [Configuration 9] provides the following effect. It is assumed that an object (support-near object A1, for example, welded portion 45) is present near the first bracket inner surface 43i and near the first bracket support portion 41. Even in this case, the shim 70 can be held on the first bracket 43 by the shim holding pin 63 in a state where the shim 70 is in contact with the first bracket support portion 41, without contacting the support-near object A1. Therefore, even if the support-near object A1 is present, the pinholes of the shim holding pin 63 of the first bracket 43 and the shim 270 can be aligned simply by bringing the shim 270 into contact with the first bracket support portion 41 (see the effect of the above [Configuration 7]).

[0124] (Fourth embodiment) 15, the backstop position adjustment device 430 of the backstop device 420 of the fourth embodiment will be described with reference to the first embodiment, focusing on the difference between the first embodiment and the fourth embodiment. The difference is the arrangement of the backstop device 420 relative to the support 27.

[0125] In the example shown in Fig. 3, the backstop position adjustment device 30 is provided at the support tip 27t. In the present embodiment, as shown in Fig. 15, the backstop position adjustment device 430 is provided at a position on the support 27 closer to the backstop-side structure 23 than the support tip 27t. For example, the backstop device 420 is provided at the support base end 27b.

[0126] The backstop device 420 adjusts the position of the support 27 in the lateral direction Y relative to the backstop side structure 23. Specifically, the first device 40 is attached and fixed to the backstop side structure 23. The second device 50 is attached and fixed to the support base end portion 27b. As a result of adjusting the position of the second device 50 in the lateral direction Y relative to the first device 40, the position of the support 27 in the lateral direction Y relative to the backstop side structure 23 is adjusted. At this time, the support 27 is moved in the lateral direction Y relative to the backstop side structure 23. As a result, the position of the backstop tip portion 24t in the lateral direction Y relative to the receiving member 21a shown in FIG. 2 is adjusted.

[0127] 15 may be divided into a plurality of members (for example, in the longitudinal direction) between the backstop-side structure 23 and the backstop 24. For example, the support 27 may be divided into a member on the support base end 27b side and a member on the support tip end 27t side. The backstop position adjustment device 430 may be provided at a connection between the member on the support base end 27b side and the member on the support tip end 27t side. The backstop position adjustment by the backstop position adjustment device 430 may be performed at a position of the support 27 between the support base end 27b and the support tip end 27t.

[0128] (Variation) The above-described embodiments (including variations within the embodiments (the same applies hereinafter)) may be modified in various ways. For example, all or parts of different embodiments may be combined in various ways. For example, the number of components of the above-described embodiments may be changed, or some of the components may not be provided. For example, the arrangement of the components may be changed. For example, components may be fixed or connected to each other directly or indirectly. For example, the inclusion relationship of the components may be changed in various ways. For example, a component described as a lower-level component included in a higher-level component may not be included in this higher-level component, but may be included in another component. For example, what is described as multiple different elements may be combined into a single element. For example, what is described as a single element may be provided as multiple different elements. For example, each component may have only a portion of its features (function, arrangement, shape, operation, etc.). [Explanation of symbols]

[0129] 10. Work Machinery 20, 220, 320, 420 Backstop Device 21 Support member side structure 21a Receiving member 23 Backstop side structure 24 Backstop 27 Support 30, 230, 330, 430 Backstop position adjustment device 41 First bracket support part 43 First Bracket 53 Second Bracket 61 Connecting pin 63 Shim retaining pin 70, 270 sim 73 Shim recess 380 spacer S70z gap Y horizontal direction

Claims

1. a receiving member side structure that is a structure of the work machine and has a receiving member; a backstop-side structure that is a structure of the work machine, attached to the receiving member-side structure, and rotatable about a rotation axis that extends laterally relative to the receiving member-side structure; a backstop attached to the backstop-side structure and received by the receiving member to limit rotation of the backstop-side structure relative to the receiving member-side structure; a support attached to the backstop side structure and the backstop to support the backstop in a predetermined position relative to the backstop side structure; a backstop position adjustment device provided on the support and configured to be able to adjust the lateral position of the backstop relative to the backstop side structure; Equipped with Backstop device.

2. 2. The backstop device of claim 1, The backstop position adjustment device is provided at the end of the support on the backstop side. Backstop device.

3. 2. The backstop device of claim 1, The backstop position adjustment device is a first bracket connected to one of the backstop side structure and the backstop; a second bracket connected to a side of the backstop side structure and the backstop different from the side to which the first bracket is connected and facing the first bracket in a lateral direction; a shim, which is a plate-like member, disposed between the first bracket and the second bracket in the lateral direction to adjust the position of the second bracket relative to the first bracket in the lateral direction; Equipped with Backstop device.

4. 4. The backstop device of claim 3, The backstop position adjustment device is a connecting pin that connects the first bracket and the second bracket, The shim is a shim recess having a concave shape that can be attached to the connecting pin from a position radially outward of the connecting pin, Backstop device.

5. 5. The backstop device of claim 4, The backstop position adjustment device is a shim holding pin that is attached to the first bracket and the shim with the shim recess attached to the connecting pin to hold the shim relative to the first bracket; Backstop device.

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