Work machine

Abstract

To provide a work machine which can more easily connect a first member and a second member which are components of either a boom or an arm of the work machine.SOLUTION: A hydraulic shovel 1 comprises: a first member 21A having a first upper insertion hole 131U formed therein; a second member 21B having a second upper insertion hole 132U formed therein; an upper connecting pin 160U movably provided on the first member 21A; an upper connecting pin drive device provided on the first member 21A for moving the upper connecting pin 160U; an upper centering member 140 provided on the second member 21B; and a marker member 180 movably attached to the second member 21B. When the upper centering member 140 of the second member 21B is engaged with the upper connecting pin 160U of the first member 21A, the marker member 180 is pressed by the upper connecting pin 160U and moves to a predetermined position P1 that protrudes upward beyond the first member 21A and the second member 21B.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a work machine, and more particularly to a work machine in which a first member and a second member constituting either a boom or an arm are connected. [Background technology]

[0002] Conventionally, there is known a technique for a working machine that can be disassembled into a plurality of sections, in which a boom or an arm is made up of a plurality of members and each member is connected by a connecting pin. For example, Patent Document 1 describes a working machine equipped with a two-member connecting device that connects a first member and a second member, which are components of a boom or an arm. In this two-member connecting device, a pair of first brackets is provided at the tip of the first member, and a pair of second brackets facing the pair of first brackets is provided at the base end of the second member. The pair of first brackets and the pair of second brackets are formed with a plurality of insertion holes through which upper connecting pins and lower connecting pins attached to the first brackets are inserted, and the first member and the second member are connected by inserting each connecting pin into each insertion hole. In addition, the second member is provided with an upper centering member that engages with the upper connecting pin to align the axial centers of the upper connecting pin and the corresponding insertion hole, and a lower centering member that abuts against the lower connecting pin to align the axial centers of the lower connecting pin and the corresponding insertion hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4806049 Summary of the Invention [Problem to be solved by the invention]

[0004] In the two-member connecting device described in Patent Document 1, the second member is suspended by a crane and carried to the first member side, and the axis of each insertion hole formed in each bracket is aligned with the upper connecting pin so that the upper centering member engages with the upper connecting pin. At this time, a worker positioned nearby visually checks whether the upper centering member is engaged with the connecting pin and indicates the specific position to the operator operating the crane or work machine. However, in order for the worker to visually check the position of the upper centering member and the connecting pin, it is necessary to take measures such as looking into each insertion hole located at a relatively high position, making it difficult to easily check visually, and the task of aligning the axis of each insertion hole with the upper connecting pin is time-consuming.

[0005] The present invention has been made in consideration of these problems, and an object of the present invention is to provide a work machine in which a first member and a second member, which are components of either the boom or the arm of the work machine, can be more easily connected. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the working machine of the present invention comprises a first member having a first pin insertion hole formed therein, a second member having a second pin insertion hole formed therein, a connecting pin movably provided on the first member, a connecting pin drive device provided on the first member for moving the connecting pin, and a centering member provided on the second member, and when the centering member of the second member is engaged with the connecting pin of the first member, the connecting pin drive device inserts the connecting pin into the first pin insertion hole and the second pin insertion hole, thereby connecting the first member and the second member; the working machine comprises a marker member movably attached to the second member, and when the centering member of the second member is engaged with the connecting pin of the first member, the marker member is pressed by the connecting pin and moves to a predetermined position protruding above the first member and the second member.

[0007] With this configuration, in the process of moving the second member toward the first member, the marker member provided on the second member is pressed by the connecting pin and rotates, and the marker member reaches a predetermined position protruding above the first and second members, allowing an operator to visually confirm from a distance that the connecting pin and the centering member have engaged. Therefore, according to the work machine of the present invention, the first member and the second member, which are components of either the boom or the arm, can be more easily connected.

[0008] Moreover, it is preferable that the marker member rotates and moves to the predetermined position when the centering member of the second member is engaged with the connecting pin of the first member.

[0009] With this configuration, the marker member can be easily moved to a predetermined position by rotating it.

[0010] In addition, it is preferable that, when the centering member engages with the connecting pin, the marker member protrudes upward above the first member and the second member, and is supported from below by the connecting pin, so as to be in the predetermined position where it does not move relative to the second member which rotates around the connecting pin.

[0011] With this configuration, an operator can easily grasp that the connecting pin and the centering member are engaged with each other by confirming that the marker member is no longer moving relative to the second member.

[0012] It is also preferable that the marker member is rotatably attached to the tip of the centering member.

[0013] With this configuration, in the process of bringing the centering member closer to the connecting pin, the marker member can be easily pressed and rotated by the connecting pin.

[0014] It is also preferable that the marker member has a pivot point that serves as a rotation center relative to the second member, a pressing portion that is pressed against the connecting pin, and a marker portion that protrudes upward above the first member and the second member when the marker member is in the specified position.

[0015] With this configuration, the marker portion is provided in addition to the pressing portion that is pressed against the connecting pin, so that when the marker member is in a predetermined position, it is easy to obtain a shape in which the marker portion protrudes upward beyond the first member and the second member.

[0016] It is also preferable that the mark member is a triangular member having three corners, and the three corners are the rotation fulcrum, the pressing portion and the mark portion.

[0017] With this configuration, the marker member having the rotation fulcrum, the pressing portion, and the marker portion can be simply configured.

[0018] In addition, it is preferable that the marker member has a recess formed in the middle of the edge connecting the pivot point and the marker portion, which recess fits into the outer surface of the connecting pin when the marker member reaches the specified position, and that the marker member is supported from below by the connecting pin at the recess.

[0019] With this configuration, when the centering member and the connecting pin engage, the marker member also fits into the outer surface of the connecting pin in the recess, so that the marker member can be stably supported from below by the connecting pin. Effect of the Invention

[0020] According to the work machine of the present invention, the first member and the second member, which are components of either the boom or the arm of the work machine, can be more easily connected. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic configuration diagram showing a hydraulic excavator as a work machine according to an embodiment. [Diagram 2]FIG. 11 is an explanatory diagram showing a connecting operation for connecting components of the boom to each other. [Diagram 3] 4 is a perspective view showing a part of a two-member connecting device provided at a tip end of a first member. FIG. [Figure 4] 3 is a cross-sectional view of a part of a two-member connecting device provided at a tip end of a first member, as viewed from the direction of arrow AA in FIG. 2. [Diagram 5] 11 is a perspective view showing a part of a two-member connecting device provided at a base end portion of a second member. FIG. [Figure 6] 10 is a front view of a part of a two-member connecting device provided at a base end of a second member, as viewed from the first member side. FIG. [Figure 7] 3 is a cross-sectional view of the two-member connecting device when viewed from the direction of arrow BB in FIG. 2 in a state in which the second bracket is inserted into the first bracket. [Figure 8] 8 is a cross-sectional view showing a state in which a pair of upper connecting pins and a pair of lower connecting pins have been moved by a connecting pin driving device from the state shown in FIG. 7. [Figure 9] 7 is a cross-sectional view of the second member as viewed from the direction of arrow CC in FIG. 6. [Figure 10] FIG. 11 is an explanatory diagram showing steps S10 and S20 of connecting a first member and a second member. [Figure 11] FIG. 11 is an explanatory diagram showing steps S30 and S40 of connecting the first member and the second member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] An embodiment of the present invention will be described below with reference to the drawings. In the following description, the front-rear direction, left-right direction, and up-down direction of the body of the work machine are defined based on the driver riding on a hydraulic excavator 1 as a work machine.

[0023] Fig. 1 is a schematic diagram showing a hydraulic excavator 1 as a work machine according to an embodiment. The hydraulic excavator 1 shown in Fig. 1 is a work machine used for demolition work of a structure that is relatively high above the ground, such as a high-rise building. As shown in Fig. 1, the hydraulic excavator 1 includes a work machine main body 10 and a work device 20.

[0024] (Work machine body) The working machine body 10 includes a lower traveling body 11 and an upper rotating body 12. The lower traveling body 11 includes a crawler 11a as a drive device for traveling the hydraulic excavator 1. The crawler 11a is driven by a hydraulic motor for traveling (not shown). The upper rotating body 12 is provided on the lower traveling body 11 so as to be rotatable. The upper rotating body 12 is driven by a hydraulic motor for turning (not shown) to turn. A cab 13 for an operator to ride on is provided in the front of the upper rotating body 12. A fuel tank 14, a machine room 15, a counterweight 16, and the like are provided behind the cab 13 of the upper rotating body 12. The machine room 15 is equipped with an engine (not shown), a hydraulic pump (not shown) driven by the engine, and the like. The hydraulic pump (not shown) pumps hydraulic oil supplied to the hydraulic motor for traveling, the hydraulic motor for turning, and each component of the working device 20 (described later), thereby operating each hydraulic device.

[0025] (Working equipment) The working device 20 is an articulated working device (front attachment), and is attached to the upper rotating body 12. The working device 20 includes a boom 21, an arm 22, a crusher 23, and a plurality of hydraulic cylinders 24, 25, and .

[0026] The boom 21 is a multi-boom type boom having a lower boom 21A rotatably connected to the upper rotating body 12, an extension boom 21B connected to the lower boom 21A, and an upper boom 21C connected to the extension boom 21B. The arm 22 has a middle arm 22A rotatably connected to the tip of the upper boom 21C, a lower arm 22B rotatably attached to the tip of the middle arm 22A, and an upper arm 22C connected to the lower arm 22B. The crusher 23 is a hydraulic working tool used for crushing concrete, for example, and is rotatably connected to the upper arm 22C. When the crusher 23 is replaced with a hydraulic bucket or a hydraulic breaker, the replaced equipment functions as a hydraulic working tool.

[0027] The hydraulic cylinder 24 is connected between the upper rotating body 12 and the lower boom 21A, and adjusts the angle of the boom 21 by extending and retracting hydraulically. The hydraulic cylinder 25 is connected between the upper boom 21C and the middle arm 22A and between the middle arm 22A and the lower arm 22B, and adjusts the angle of the arm 22 by extending and retracting hydraulically. The hydraulic cylinder 26 is connected between the upper arm 22C and the crusher 23, and adjusts the angle of the crusher 23 by extending and retracting hydraulically. The hydraulic cylinders 24, 25, 26 are supplied with hydraulic oil from a hydraulic pump (not shown) provided in the machine room 15 via a hydraulic hose (not shown).

[0028] 2 is an explanatory diagram showing a state of a connecting operation for connecting together the components of the boom 21. When connecting together the components of the boom 21 in the hydraulic excavator 1 configured as described above, the extension boom 21B is brought close to the lower boom 21A connected to the upper rotating body 12 while being suspended by the crane device 5, and both are connected together by the two-member connecting device 100 according to the embodiment.

[0029] (2-component connection device) The hydraulic excavator 1 is provided with a two-member connecting device 100 to connect the lower boom 21A and the extension boom 21B. In the following description, the lower boom 21A is referred to as the "first member 21A" connected by the two-member connecting device 100, and the extension boom 21B is referred to as the "second member 21B" connected by the two-member connecting device 100. As shown in FIG. 2, the end of the first member 21A on the upper rotating body 12 side is referred to as the "base end 211A", and the end opposite the base end 211A is referred to as the "tip end 212A". The end of the second member 21B facing the tip end 212A of the first member 21A is referred to as the "base end 211B", and the end opposite the base end 211B of the second member 21B is referred to as the "tip end 212B". In addition, the directions of each member will be described based on a state in which a tip end 212A of the first member 21A faces forward in the longitudinal direction of the aircraft body, and a base end 211B of the second member 21B faces backward in the longitudinal direction of the aircraft body.

[0030] Fig. 3 is a perspective view showing a part of the two-member connecting device 100 provided at the tip end 212A of the first member 21A. Fig. 4 is a cross-sectional view of a part of the two-member connecting device 100 provided at the tip end 212A of the first member 21A, viewed from the direction of the arrow AA in Fig. 2. Note that Fig. 4 omits the illustration of the first member 21A. Fig. 5 is a perspective view showing a part of the two-member connecting device 100 provided at the base end 211B of the second member 21B. Fig. 6 is a front view of a part of the two-member connecting device 100 provided at the base end 211B of the second member 21B, viewed from the first member 21A side.

[0031] The two-member connecting device 100 comprises a pair of first brackets 110, a pair of second brackets 120, a pair of upper centering members (centering members) 140, a pair of lower centering members 150, a pair of upper connecting pins (connecting pins) 160U and a pair of lower connecting pins 160D, a connecting pin driving device 170 that drives the pair of upper connecting pins 160U and the pair of lower connecting pins 160D, and a marker member 180.

[0032] (First pair of brackets) 3 and 4, the pair of first brackets 110 are provided at both the left and right ends of the tip portion 212A of the first member 21A with a gap between them in the left-right direction. Each first bracket 110 is fixed to the tip portion 212A by welding, for example, and protrudes from the tip portion 212A in the front-rear direction of the aircraft body.

[0033] The pair of first brackets 110 includes a right first bracket 110R and a left first bracket 110L. The right first bracket 110R is spaced apart from each other in the left-right direction and includes a right outer first bracket 110Ro and a right inner first bracket 110Ri that face each other. Similarly, the left first bracket 110L is spaced apart from each other in the left-right direction and includes a left outer first bracket 110Lo and a left inner first bracket 110Li that face each other.

[0034] (First upper through hole and first lower through hole) Further, the pair of first brackets 110 are formed with a pair of first upper through-holes (first pin through-holes) 131U through which the pair of upper connecting pins 160U are inserted, and a pair of first lower through-holes 131D through which the pair of lower connecting pins 160D are inserted. The first upper through-holes 131U are formed in the right first bracket 110R and the left first bracket 110L, respectively. More specifically, the first upper through-holes 131U are formed in the upper portions of the right outer first bracket 110Ro, the right inner first bracket 110Ri, the left outer first bracket 110Lo, and the left inner first bracket 110Li, one each, so as to be aligned on the same axis extending in the left-right direction (i.e., so that the hole axes overlap). The first lower through-holes 131D are formed in the right first bracket 110R and the left first bracket 110L, respectively. More specifically, the first lower insertion holes 131D are formed one each in the lower parts of the right outer first bracket 110Ro, the right inner first bracket 110Ri, the left outer first bracket 110Lo, and the left inner first bracket 110Li, so as to be aligned coaxially extending in the left-right direction.

[0035] (Pair of 2nd brackets) 5 and 6, the pair of second brackets 120 are provided at both left and right ends of the base end 211B of the second member 21B with a gap between them in the left-right direction. Each second bracket 120 is fixed to the base end 211B by welding, for example, and protrudes from the base end 211B in the fore-aft direction of the aircraft body.

[0036] The pair of second brackets 120 includes a right second bracket 120R and a left second bracket 120L. Here, FIG. 7 is a cross-sectional view of the two-member connecting device 100 when the second bracket 120 is inserted into the first bracket 110, as viewed from the direction of the arrow BB in FIG. 2. In addition, in FIG. 7 and FIG. 8 described later, the second member 21B and the pair of lower centering members 150 are omitted. As shown in the figure, the right second bracket 120R can be inserted between the right outer first bracket 110Ro and the right inner first bracket 110Ri described above, and faces the right outer first bracket 110Ro and the right inner first bracket 110Ri in the left-right direction. Similarly, the left second bracket 120L can be inserted between the left outer first bracket 110Lo and the left inner first bracket 110Li described above, and faces the left outer first bracket 110Lo and the left inner first bracket 110Li in the left-right direction.

[0037] (Second upper through hole and second lower through hole) Further, the pair of second brackets 120 are formed with a pair of second upper through-holes (second pin through-holes) 132U through which the pair of upper connecting pins 160U are inserted, and a pair of second lower through-holes 132D through which the pair of lower connecting pins 160D are inserted. The second upper through-holes 132U are formed in the upper portions of the right second bracket 120R and the left second bracket 120L, one each, so as to be aligned coaxially extending in the left-right direction. Therefore, the second upper through-holes 132U are formed so as to be arranged coaxially with the pair of first upper through-holes 131U described above, as shown in FIG. 7. Further, the second lower through-holes 132D are formed in the lower portions of the second brackets 120, one each, so as to be aligned coaxially with the pair of first lower through-holes 131D described above, as shown in FIG. 7. Therefore, the second lower through-holes 132D are formed so as to be arranged coaxially with the pair of first lower through-holes 131D described above, as shown in FIG.

[0038] (A pair of upper centering members) 4 and 5, the pair of upper centering members 140 are provided one above the base end 211B of the second member 21B with a gap between them in the left-right direction. Each upper centering member 140 is fixed to the base end 211B by welding, for example, and protrudes in a hook shape from the base end 211B in the front-rear direction of the aircraft body.

[0039] The pair of upper centering members 140 includes an upper right centering member 140R provided near the right second bracket 120R and an upper left centering member (centering member) 140L provided near the left second bracket 120L. As shown in Fig. 7, when the second bracket 120 is inserted into the first bracket 110, the upper right centering member 140R faces the right second bracket 120R in the left-right direction across the right inner first bracket 110Ri. Similarly, when the second bracket 120 is inserted into the first bracket 110, the upper left centering member 140L faces the left second bracket 120R in the left-right direction across the left inner first bracket 110Li.

[0040] As described above, each upper centering member 140 is formed in a hook shape and can be engaged with the upper connecting pin 160U arranged in the vicinity. More specifically, the upper centering member 140 has an arc-shaped engagement groove portion 145 formed to draw a convex shape on the upper side along the second upper through hole 132U of the second bracket 120. The upper centering member 140 engages with the upper connecting pin 160U from above through the engagement groove portion 145, thereby aligning the axial centers of the upper connecting pin 160U with the first upper through hole 131U and the second upper through hole 132U, and becomes a guide member that guides the upper connecting pin 160U to the first upper through hole 131U and the second upper through hole 132U.

[0041] (Lower centering part) 4 and 5, the pair of lower centering members 150 are provided one below the base end 211B of the second member 21B with a gap between them in the left-right direction. Each lower centering member 150 is fixed to the base end 211B by welding, for example, and protrudes from the base end 211B in the front-rear direction of the aircraft body.

[0042] The pair of lower centering members 150 includes a right lower centering member 150R provided near the right second bracket 120R and a left lower centering member 150L provided near the left second bracket 120L. As shown in FIG. 7, when the second bracket 120 is inserted into the first bracket 110, the right lower centering member 150R faces the right second bracket 120R in the left-right direction across the right inner first bracket 110Ri. Similarly, when the second bracket 120 is inserted into the first bracket 110, the left lower centering member 150L faces the left second bracket 120L in the left-right direction across the left inner first bracket 110Li.

[0043] Each lower centering member 150 is formed so as to be able to position the lower connecting pin 160D by abutting against the corresponding lower connecting pin 160D arranged nearby. More specifically, the lower centering member 150 has an abutment recess 155 formed in an arc shape so as to draw a concave shape toward the second member 21B along the second lower through hole 132D of the second bracket 120. The abutment recess 155 of the lower centering member 150 abuts against the lower connecting pin 160D, and aligns the axis of the lower connecting pin 160D with the pair of first lower through holes 131D and the pair of second lower through holes 132D. As a result, the lower centering member 150 becomes a guide member that guides the lower connecting pin 160D to the first lower through hole 131D and the second lower through hole 132D.

[0044] (A pair of upper connecting pins and a pair of lower connecting pins) The pair of upper connecting pins 160U are attached to a connecting pin drive device 170, which will be described later. As shown in FIG. 7, each upper connecting pin 160U is provided corresponding to the first upper through-hole 131U and the second upper through-hole 132U arranged nearby. The upper connecting pin 160U is formed with a diameter slightly smaller than the first upper through-hole 131U and each second upper through-hole 132U, and is arranged coaxially with the first upper through-hole 131U and the second upper through-hole 132U. Similarly, each lower connecting pin 160D is provided corresponding to the first lower through-hole 131D and the second lower through-hole 132D arranged nearby. The lower connecting pin 160D is formed with a diameter slightly smaller than the first lower through-hole 131D and each second lower through-hole 132D, and is arranged coaxially with the first lower through-hole 131D and the second lower through-hole 132D.

[0045] (Connecting pin drive device) The connecting pin drive device 170 will be described with reference to Figures 4, 7, and 8. Figure 8 is a cross-sectional view showing a state in which a pair of upper connecting pins 160U and a pair of lower connecting pins 160D have been moved by the connecting pin drive device 170 from the state shown in Figure 7. The connecting pin drive device 170 is attached to the first member 21A and is driven by hydraulic pressure from a hydraulic supply source (not shown) mounted on the hydraulic excavator 1, and is drive-controlled by a controller (not shown) of the hydraulic excavator 1 in response to instructions from an operator on board the hydraulic excavator 1.

[0046] The connecting pin drive device 170 has an upper connecting pin drive device 170U that drives the pair of upper connecting pins 160U, and a lower connecting pin drive device 170D that drives the pair of lower connecting pins 160D. The upper connecting pin drive device 170U and the lower connecting pin drive device 170D have the same configuration except that they are arranged symmetrically in the vertical direction. Therefore, in the following explanation, the configuration of the connecting pin drive device 170 will be explained using the upper connecting pin drive device 170U as an example.

[0047] When the upper centering member 140 of the second member 21B is engaged with the upper connecting pin 160U of the first member 21A, the upper connecting pin drive device 170U inserts the upper connecting pin 160U into the first upper through-hole 131U and the second upper through-hole 132U to connect the first member 21A and the second member 21B. As shown in FIG. 4, the upper connecting pin drive device 170U has a cylinder 171, a first lever 172A, a second lever 172B, and a link member 173. The cylinder 171 is a hydraulic cylinder and has a tube 171A, a piston (not shown) disposed in the tube 171A, and a rod 171B protruding from the tube 171A connected to the piston. The cylinder 171 drives the piston by hydraulic pressure supplied from a hydraulic supply source (not shown) to move the rod 171B in the left-right direction. One end of the first lever 172A is rotatably connected to the tip of the rod 171B, and the other end is connected to the upper connecting pin 160U. The first lever 172A is rotatably connected to the link member 173 at a midpoint. The second lever 172B is rotatably connected to the end of the cylinder 171 opposite to the rod 171B, and the other end is connected to the upper connecting pin 160U. The second lever 172B is rotatably connected to the link member 173 at a midpoint. The link member 173 is fixed to the first member 21A, and supports the cylinder 171, the first lever 172A, and the second lever 172B.

[0048] With this configuration, when the cylinder 171 is extended, as shown in Fig. 7, the upper connecting pin 160U is inserted only through the first upper through-hole 131U formed in the right inner first bracket 110Ri and the left inner first bracket 110Li. Note that, as shown in Fig. 4, a stopper 174 is attached between the right inner first bracket 110Ri and the left inner first bracket 110Li, and the stopper 174 restricts the first lever 172A and the second lever 172B from moving in a direction toward each other, thereby preventing the pair of upper connecting pins 160U from falling out of the first upper through-hole 131U described above.

[0049] On the other hand, as shown in Fig. 8, when the cylinder 171 is contracted, the first lever 172A and the second lever 172B move in the left-right direction so as to move away from each other. This causes the pair of upper connecting pins 160U to move in the left-right direction so as to move away from each other. Note that below the first upper through-holes 131U of the right inner first bracket 110Ri and the left inner first bracket 110Li, a stopper 175 is provided to restrict the first lever 172A and the second lever 172B from moving in the direction away from each other from the state shown in Fig. 8.

[0050] In the lower connecting pin drive device 170D, similarly to the above-described upper connecting pin drive device 170U, by switching between extension and contraction of the cylinder 171, it is possible to move each lower connecting pin 160D in the left-right direction.

[0051] (Marking material) 9 is a cross-sectional view of the second member 21B seen from the direction of the arrow CC in FIG. 6. As shown in FIG. 5, FIG. 6, and FIG. 9, the marker member 180 is located on the right side of the upper left centering member 140L of the second member 21B, and is pin-coupled to the tip 141 of the upper left centering member 140L. As a result, the marker member 180 is rotatable about a rotation axis extending in the left-right direction relative to the upper left centering member 140L. The marker member 180 is pressed by the upper connecting pin 160U to rotate as the upper connecting pin 160U is inserted, and when the upper left centering member 140L engages with the corresponding upper connecting pin 160U, the marker member 180 is rotated to a predetermined position P1 (see step S30 in FIG. 11) protruding upward from the first member 21A and the second member 21B. Here, "protruding upward" means that the marker member 180 protrudes upward from the uppermost portion 213A of the first member 21A (see Figs. 10 and 11) and the uppermost portion 213B of the second member 21B at least in a range where the marker member 180 can overlap with the marker member 180 when viewed from the left and right direction (a place on the rotation orbit of the marker member 80). The marker member 180 is disposed at a position where it can come into contact with the upper connecting pin 160U that engages with the upper left centering member 140L, as shown in Fig. 7.

[0052] In this embodiment, the marker member 180 is a triangular member having three corners 180a, 180b, and 180c. The corner 180a is a rotation fulcrum 181 when the marker member 180 is pressed by the upper connecting pin 160U to rotate. The corner 180b is a pressing portion 182 that is pressed by the upper connecting pin 160U. The corner 180c is a marker portion 183 that protrudes upward beyond the first member 21A and the second member 21B when the marker member 180 is at the predetermined position P1.

[0053] As described above, the pivot fulcrum 181 is pin-coupled to the tip 141 of the upper left centering member 140L so as to be rotatable around a rotation axis extending in the left-right direction. As shown in FIG. 9, in an initial state in which the marker member 180 is not pressed by the upper connecting pin 160U, the marker member 180 hangs from the upper left centering member 140L so that the pressing portion 182 faces the opposite side to the second member 21B (the first member 21A side connected to the second member 21B: the left side in the figure). In the initial state shown in FIG. 9, the pressing portion 182 is located on the opposite side to the second member 21B with respect to the pivot fulcrum 181, and the marker portion 183 is located on the second member 21B side of the pivot fulcrum 181. This allows the pressing portion 182 to be easily pressed by the upper connecting pin 160U, and the marker portion 183 to be easily protruded upward from the first member 21A and the second member 21B. Moreover, the pressing portion 182 is formed in an arc shape, which makes it possible to prevent damage due to contact with the upper connecting pin 160U.

[0054] Furthermore, a recess 185 recessed toward the mark portion 183 is formed on side 184 connecting rotation fulcrum 181 and pressing portion 182. Recess 185 is formed in an arc shape slightly larger than the outer diameter of upper connecting pin 160U. Recess 185 is provided so as to fit from above into the outer surface of upper connecting pin 160U when marker member 180 is in predetermined position P1, that is, when upper left centering member 140L and upper connecting pin 160U engage with each other.

[0055] (Connection operation of first member and second member) The operation of connecting the first member 21A and the second member 21B by the two-member connecting device 100 will be described with reference to Figures 2, 7, 8, 10, and 11. Figure 10 is an explanatory diagram showing the state when connecting the first member 21A and the second member 21B as steps S10 and S20, and Figure 11 is an explanatory diagram showing the state when connecting the first member 21A and the second member 21B as steps S30 and S40.

[0056] The operation of connecting the first member 21A and the second member 21B is performed by three workers. The first worker is a shovel operator who gets on the hydraulic shovel 1 and operates the first member 21A (lower boom 21A) and the connecting pin driving device 170. The second worker is a crane operator who gets on the crane device 5 shown in FIG. 2 and moves the second member 21B (extension boom 21B) suspended from the crane device 5 relative to the first member 21A. The third worker is a work inspector who is located near the connection part between the first member 21A and the second member 21B and visually checks the progress of the connecting operation by the two-member connecting device 100 while giving instructions for operation to the shovel operator and the crane operator. Note that, for example, if the crane operator can perform visual inspection described below, the work inspector may be omitted.

[0057] First, the three workers cooperate to bring the second member 21B closer to the first member 21A, and insert the second bracket 120 into the first bracket 110. Specifically, as shown in Fig. 7, the right second bracket 120R is inserted between the right outer first bracket 110Ro and the right inner first bracket 110Ri, and the left second bracket 120L is inserted between the left outer first bracket 110Lo and the left inner first bracket 110Li.

[0058] At this time, as shown in step S10 of FIG. 10, first, in order to engage the upper connecting pin 160U with the upper centering member 140 (upper left centering member 140L in the figure), the first member 21A and the second member 21B are brought closer to each other. As a result, the upper connecting pin 160U comes into contact with the pressing portion 182 of the marker member 180 attached to the upper left centering member 140L. When the second member 21B is brought closer to the first member 21A, as shown in step S20, the upper connecting pin 160U presses the pressing portion 182 of the marker member 180, causing the marker member 180 to rotate around the rotation fulcrum 181 relative to the upper left centering member 140L. As a result, the marker portion 183 moves upward.

[0059] When the second member 21B is further moved closer to the first member 21A, as shown in step S30 of FIG. 11, the engagement groove 145 of the upper left centering member 140L and the upper connecting pin 160U are engaged with each other. Although not shown, the engagement groove 145 of the upper right centering member 140R and the upper connecting pin 160U are also engaged with each other. Then, in the state shown in step S30, the marker member 180 is in a predetermined position P1 where the marker portion 183 protrudes upward from the first member 21A and the second member 21B. At the predetermined position P1, the marker member 180 is supported from below by the upper connecting pin 160U while the recess 185 described above is engaged with the upper connecting pin 160U. The work inspector visually confirms from the ground that the marker member 180 is in the predetermined position P1. The height at which the marker portion 183 protrudes above the first member 21A and the second member 21B is set to a height that is visible from the ground to a work inspector.

[0060] A method for determining that the marker member 180 has reached the predetermined position P1, not in the middle of rotation, will be described. After the engagement groove portion 145 of the upper centering member 140 and the upper connecting pin 160U are engaged, while maintaining the state in which the engagement groove portion 145 and the upper connecting pin 160U are engaged, the second member 21B is rotated relative to the first member 21A about the upper connecting pin 160U, and the marker member 180 supported from below by the upper connecting pin 160U also rotates together with the second member 21B about the upper connecting pin 160U relative to the first member 21A. In other words, the marker member 180 does not move relative to the second member 21B. Therefore, if the work inspector visually checks the marker portion 183 and can confirm that the marker member 180 is in a state in which it does not move relative to the second member 21B, the work inspector can determine that the marker member 180 has reached the predetermined position P1. In other words, the marker member 180 being in the predetermined position P1 means that the marker member 180 protrudes upward from the first member 21A and the second member 21B and does not move relative to the second member 21B even if the second member 21B rotates about the upper connecting pin 160U. As a result, the work inspector grasps that the engagement groove portion 145 of the upper centering member 140 and the upper connecting pin 160U are engaged and that the axes of the upper connecting pin 160U, the first upper through hole 131U, and the second upper through hole 132U are aligned, and communicates this to the shovel operator and the crane operator.

[0061] When the axes of the upper connecting pin 160U, the first upper through hole 131U and the second upper through hole 132U are aligned as described above, the excavator operator drives the upper connecting pin drive device 170U to move each upper connecting pin 160U in a direction separating them in the left-right direction as shown in Fig. 8, and inserts each upper connecting pin 160U into the first upper through hole 131U and the second upper through hole 132U. This brings the first bracket 110 and the second bracket 120 into a state where they are connected by the upper connecting pin 160U.

[0062] When the first bracket 110 and the second bracket 120 are connected by the upper connecting pin 160U, the crane operator operates the crane device 5 and rotates the second member 21B relative to the first member 21A around the upper connecting pin 160U as shown in step S40 of FIG. 11. This brings the lower connecting pin 160D into contact with the abutment recess 155 of each lower centering member 150. Since the first bracket 110 and the second bracket 120 are connected by the upper connecting pin 160U and are positioned in the left-right direction, the abutment recess 155 of each lower centering member 150 and the lower connecting pin 160D can be easily brought into contact with each other by simply rotating the second member 21B around the upper connecting pin 160U. The work inspector confirms that the lower connecting pin 160D has abutted against the abutment recess 155 of each lower centering member 150 and communicates this to the excavator operator and the crane operator. As a result, the axes of the lower connecting pin 160D, the first lower through-hole 131D and the second lower through-hole 132D are aligned.

[0063] Then, the excavator operator drives the lower connecting pin drive device 170D to move each of the lower connecting pins 160D in a direction away from each other in the left-right direction, as shown in FIG. 8, and inserts each of the lower connecting pins 160D into the first lower insertion hole 131D and the second lower insertion hole 132D. As a result, the first bracket 110 and the second bracket 120 are connected to each other by both the upper connecting pin 160U and the lower connecting pin 160D. Note that each of the upper connecting pins 160U and each of the lower connecting pins 160D is fastened to the first bracket 110 by a plurality of bolts 190 from the outside in the left-right direction in the state shown in FIG. 8. As a result, the first member 21A and the second member 21B are connected to each other by each of the upper connecting pins 160U and each of the lower connecting pins 160D.

[0064] (Effects of the embodiment) As described above, the hydraulic excavator (work machine) 1 according to the embodiment includes the first member 21A (lower boom 21A) in which the first upper through-hole (first pin insertion hole) 131U is formed, the second member 21B (extension boom 21B) in which the first upper through-hole (second pin insertion hole) 132U is formed, the upper connecting pin (connecting pin) 160U movably provided on the first member 21A, and the upper connecting pin 160U provided on the first member 21A for moving the upper connecting pin 160U. The hydraulic excavator 1 includes an upper connecting pin drive device (connecting pin drive device) 170U for driving the second member 21B and an upper centering member (centering member) 140 provided on the second member 21B, and when the upper centering member 140 of the second member 21B is engaged with the upper connecting pin 160U of the first member 21A, the connecting pin drive device 170 inserts the connecting pin 160U into the first upper through hole 131U and the second upper through hole 132U to connect the first member 21A and the second member 21B. The hydraulic excavator 1 includes a marker member 180 movably attached to the second member 21B, and when the upper centering member 140 of the second member 21B is engaged with the upper connecting pin 160U of the first member 21A, the marker member 180 is pressed by the upper connecting pin 160U and moves to a predetermined position P1 protruding above the first member 21A and the second member 21B.

[0065] With this configuration, in the process of moving the second member 21B toward the first member 21A, the marker member 180 provided on the second member 21B is pressed by the upper connecting pin 160U to rotate, and the marker member 180 reaches a predetermined position P1 protruding above the first member 21A and the second member 21B, allowing the work inspector to visually confirm from a distant position, i.e., from the ground, that the upper connecting pin 160U and the upper centering member 140 have engaged. Therefore, with the hydraulic excavator 1 according to the embodiment, the first member 21A and the second member 21B, which are components of the boom 21 of the hydraulic excavator 1, can be more easily connected.

[0066] Furthermore, the marker member 180 rotates and moves to a predetermined position P1 when the upper centering member 140 of the second member 21B is engaged with the upper connecting pin 160U of the first member 21A.

[0067] With this configuration, the marker member 180 can be easily moved to the predetermined position P1 by rotating it.

[0068] In addition, when the upper left centering member (centering member) 140L engages with the upper connecting pin 160U, the marker member 180 protrudes upwardly beyond the first member 21A and the second member 21B, and is supported from below by the upper connecting pin 160U, reaching a predetermined position P1 at which it does not move relative to the second member 21B which rotates around the upper connecting pin 160U.

[0069] With this configuration, the operator can confirm that the marker member 180 is no longer moving relative to the second member, and can easily grasp that the upper connecting pin 160U and the upper left centering member 140L are engaged.

[0070] Moreover, the marker member 180 is rotatably attached to the tip portion 141 of the upper left centering member 140L.

[0071] With this configuration, in the process of bringing the upper left centering member 140L closer to the upper connecting pin 160U, the marker member 180 can be easily pressed and rotated by the upper connecting pin 160U.

[0072] In addition, the marker member 180 has a pivot fulcrum 181 that serves as the center of rotation relative to the second member 21B, a pressing portion 182 that is pressed by the upper connecting pin 160U, and a marker portion 183 that protrudes upward beyond the first member 21A and the second member 21B when the marker member 180 reaches a predetermined position P1.

[0073] With this configuration, the marker portion 183 is provided in addition to the pressing portion 182 that is pressed by the upper connecting pin 160U, so that when the marker member 180 is in the specified position P1, it is easy to obtain a shape in which the marker portion 183 protrudes upward beyond the first member 21A and the second member 21B.

[0074] The marker member 180 is a triangular member having three corners 180a, 180b, and 180c, and the three corners 180a, 180b, and 180c serve as a rotation fulcrum 181, a pressing portion 182, and a marker portion 183.

[0075] With this configuration, the marker member 180 having the rotation fulcrum 181, the pressing portion 182, and the marker portion 183 can be made to have a simple configuration.

[0076] In addition, the marker member 180 has a recess 185 formed in the middle of the side 184 connecting the pivot point 181 and the marker portion 183, which fits into the outer surface of the upper connecting pin 160U when the marker member 180 reaches the specified position P1, and is supported from below by the upper connecting pin 160U at the recess 185.

[0077] With this configuration, when the upper left centering member 140L and the upper connecting pin 160U engage with each other, the marker member 180 also fits into the outer surface of the upper connecting pin 160U in the recess 185 and is supported from below, so that the marker member 180 can be stably supported by the upper connecting pin 160U. For example, it is possible to prevent the marker member 180 from further rotating counterclockwise from the state shown in step S30 in Fig. 11 to a state where the marker portion 183 does not protrude above the first member 21A and the second member 21B.

[0078] (Modification) Although the description of the embodiment is finished above, the aspects of the present invention are not limited to this embodiment. For example, in this embodiment, the hydraulic excavator 1 is exemplified as the work machine, but the two-member connecting device 100 may be applied to other work machines as long as they are equipped with a boom 21 and an arm 22.

[0079] In addition, in this embodiment, the lower boom 21A of the boom 21 is the first member 21A, and the extension boom 21B is the second member 21B, but the first member and the second member connected by the two-member connecting device 100 may be other members. For example, the extension boom 21B of the boom 21 may be the first member, and the upper boom 21C may be the second member. Also, for example, the lower arm 22B of the arm 22 may be the first member, and the upper arm 22C may be the second member.

[0080] In this embodiment, the marker member 180 is attached to the tip 141 of the upper left centering member 140L. However, the attachment position of the marker member 180 is not limited to this as long as the upper connecting pin 160U can press and rotate the marker member 180 to the predetermined position P1 and the position does not interfere with other members. For example, a separate portion for attaching the marker member 180 may be provided on the second member 21B.

[0081] In addition, in this embodiment, the marker member 180 is a triangular member, but the configuration of the marker member 180 is not limited to this. The marker member 180 may be, for example, an L-shaped member having a rotation fulcrum 181, a pressing portion 182, and a marker portion 183. Note that the marker member 180 may move with respect to the second member 21B by a motion other than rotation, as long as it can be moved to the predetermined position P1 by being pressed by the upper connecting pin 160U.

[0082] Additionally, the recess 185 may be omitted from the marker member 180. [Explanation of symbols]

[0083] 1. Hydraulic excavator (working machine) 5 Crane equipment 10. Working machine body 20 Working Equipment 21 Boom 21A Lower boom (first part) 21B Extension boom (second member) 21C Upper boom 211A, 211B base end 212A, 212B tip 22 Arm 22A Middle Arm 22B Lower Arm 22C Upper arm 23 Crusher 100 2-component connection device 110 First Bracket 120 Second Bracket 131D 1st lower insertion hole 131U 1st upper insertion hole (1st pin insertion hole) 132D 2nd lower insertion hole 132U 2nd upper insertion hole (2nd pin insertion hole) 140 Upper centering member (centering member) 140L Upper left centering part 140R Upper right centering part 141 Tip 145 Engagement groove 150 Lower centering member 150L lower left centering part 150R Right bottom centering part 155 Contact recess 160D Lower connecting pin 160U Upper connecting pin (connecting pin) 170 Connecting pin drive device 170D Lower connecting pin drive unit 170U Upper connecting pin drive unit 180 Marking material 180a, 180b, 180c corner 181 Pivot Point 182 Pressing part 183 Marker 184 sides 185 Recess P1 Predetermined position

Claims

1. a first member having a first pin insertion hole formed therein; A second member having a second pin insertion hole formed therein; A connecting pin movably provided on the first member; a connecting pin drive device provided on the first member and configured to move the connecting pin; a centering member provided on the second member, a connecting pin drive device for connecting the first member and the second member by inserting the connecting pin into the first pin insertion hole and the second pin insertion hole when the centering member of the second member is engaged with the connecting pin of the first member, A marker member is provided which is movably attached to the second member, When the centering member of the second member is engaged with the connecting pin of the first member, the marker member is pressed by the connecting pin and moves to a predetermined position protruding above the first member and the second member.

2. The work machine according to claim 1 , wherein the marker member rotates and moves to the predetermined position when the centering member of the second member is engaged with the connecting pin of the first member.

3. A work machine as described in claim 1, wherein when the centering member engages with the connecting pin, the marker member protrudes above the first member and the second member, and is supported from below by the connecting pin, so that the marker member is at the predetermined position where it does not move relative to the second member which rotates around the connecting pin.

4. The work machine according to claim 1 , wherein the marker member is rotatably attached to the tip end of the centering member.

5. 2. The work machine according to claim 1, wherein the marker member has a pivot point that serves as a pivot center relative to the second member, a pressing portion that is pressed by the connecting pin, and a marker portion that protrudes above the first member and the second member when the marker member is in the specified position.

6. 6. The work machine according to claim 5, wherein the marker member is a triangular member having three corners, the three corners being the pivot point, the pressing portion and the marker portion.

7. The work machine according to claim 6, wherein the marker member has a recess formed in the middle of a side connecting the pivot point and the marker portion, the recess fitting into the outer surface of the connecting pin when the marker member is in the specified position, and the marker member is supported from below by the connecting pin at the recess.

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