Two-part connecting device and construction machinery

Abstract

To easily perform connection work without looking into it from above, and to prevent damage to guide members and connection pins.SOLUTION: On an outer surface of a second left bracket 24 of an upper boom 10 facing a left outer bracket 22A of a first left bracket 22, a left stopper member 36 is provided that comes into contact with the first left bracket 22 at a position where a left guide member 32 reaches an upper left connecting pin 26 when the upper boom 10 is moved laterally to approach a lower boom 9. On an outer surface of a second right bracket 25 of the upper boom 10 facing a right outer bracket 23A of a first right bracket 23, a right stopper member 37 is provided that comes into contact with the first right bracket 23 at a position where a right guide member 33 reaches an upper right connecting pin 27 when the upper boom 10 is moved laterally to approach the lower boom 9.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a two-member connecting device and a construction machine that are suitably used for connecting adjacent booms that constitute a multi-boom using a connecting pin, for example.

Background Art

[0002] A hydraulic excavator, which is a representative example of a construction machine, includes a self-propelled lower traveling body, an upper revolving body that is rotatably provided on the lower traveling body, and a working device that is rotatably provided on the front side of the upper revolving body.

[0003] In addition, there are some models of hydraulic excavators that perform demolition work at high altitudes. The working device used for this high-altitude demolition work includes a multi-boom formed by connecting a plurality of booms. For example, among the plurality of booms that constitute the multi-boom, adjacent lower booms and upper booms are detachably connected by a two-member connecting device. The lower boom and the upper boom are formed in a square tube shape including left and right side surfaces, an upper surface, and a lower surface.

[0004] The two-member connecting device includes a pair of first brackets provided on a lower boom forming a first boom, facing each other with a gap on the outer and inner sides in the left-right direction, first pin insertion holes provided on the pair of first brackets on the same axis, a second bracket provided on an upper boom forming a second boom, inserted into the gap between the pair of first brackets, a second pin insertion hole provided on the second bracket and communicating with the first pin insertion hole at the connection position between the lower boom and the upper boom, and a connecting pin inserted into the first pin insertion hole and the second pin insertion hole from the side of the first bracket inside the lower boom.

[0005] When connecting the lower boom and upper boom using a two-part connecting device, the lower boom is tilted forward, and the upper boom, which is lifted horizontally, is brought close to the lower boom, aligning the second pin insertion hole of the second bracket with the first pin insertion hole of the first bracket. However, aligning the first and second pin insertion holes with the upper boom in a lifted position is difficult, and the connecting work becomes time-consuming and labor-intensive.

[0006] Therefore, the two-member connecting device is equipped with a guide member on the upper boom. This guide member is configured to engage with the connecting pin on the first bracket side when the upper boom is lifted and the second bracket is brought close to the first bracket, thereby guiding the second bracket to the connecting position, that is, to a position where the second pin insertion hole is coaxial with the first pin insertion hole (Patent Document 1). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2010-230113 [Overview of the project] [Problems that the invention aims to solve]

[0008] Incidentally, the guide member of the two-part connecting device is structured to engage with the connecting pins inserted into the first and second pin insertion holes from the inner first bracket side. Therefore, the positional relationship between the connecting pins and the guide member cannot be visually inspected from the side of the work device. Consequently, equipment such as an aerial work platform is required to look at the distance between the connecting pins and the guide member from above, which makes the connecting work time-consuming.

[0009] Furthermore, the distance between the connecting pin and the guide member is difficult to determine accurately by simply looking at it from above. Because of this, there is a risk that the guide member may collide with the connecting pin, potentially damaging both the guide member and the connecting pin.

[0010] The present invention has been made in view of the problems of the prior art described above, and the object of the present invention is to provide a two-member connecting device and construction machinery that allows for easy connection work without having to look over from above, and that prevents damage to guide members and connecting pins. [Means for solving the problem]

[0011] The two-member connecting device according to the present invention is a two-member connecting device for connecting a first member and a second member, comprising: a pair of first brackets provided on the first member and facing each other with a gap between them on the outer and inner sides in the left-right direction; a first pin insertion hole provided on the same axis in each of the pair of first brackets; a second bracket provided on the second member and inserted into the gap between the pair of first brackets; a second pin insertion hole provided on the second bracket and communicating with the first pin insertion hole at the connection position between the first member and the second member; and from the inner side of the first bracket A two-member connecting device comprising a connecting pin inserted into a first pin insertion hole and a second pin insertion hole, and a guide member provided on the second member that engages with the connecting pin when the second bracket is brought close to the first bracket to guide the second bracket to the connecting position, wherein a stopper member is provided on the outer surface of the second bracket facing the outer first bracket, and when the second member is moved laterally to approach the first member, the guide member abuts against the first bracket at the position where it reaches the connecting pin.

[0012] Furthermore, the construction machine of the present invention comprises a self-propelled lower traveling body, an upper rotating body rotatably mounted on the lower traveling body, a multi-boom type working device provided on the front side of the upper rotating body and comprising a plurality of booms connected together, and a two-member connecting device that connects adjacent first booms and second booms among the plurality of booms, wherein the two-member connecting device comprises a pair of first brackets provided on the first boom and facing each other with a gap between them on the outer and inner sides in the left-right direction, first pin insertion holes provided on the same axis in each of the pair of first brackets, a second bracket provided on the second boom and inserted into the gap between the pair of first brackets, and the second bracket The bracket includes a second pin insertion hole provided on the bracket and communicating with the first pin insertion hole at the connection position between the first boom and the second boom, a connecting pin inserted into the first pin insertion hole and the second pin insertion hole from the inner first bracket side, and a guide member provided on the second boom that engages with the connecting pin when the second bracket is brought close to the first bracket and guides the second bracket to the connection position, and a stopper member is provided on the outer surface of the second bracket facing the outer first bracket, which abuts against the first bracket when the guide member reaches the connecting pin when the second boom is moved laterally and brought close to the first boom. [Effects of the Invention]

[0013] According to the present invention, connection work can be easily performed without having to look from above, and damage to guide members and connecting pins can be prevented. [Brief explanation of the drawing]

[0014] [Figure 1] This is a left side view showing a multi-boom hydraulic excavator to which a two-member connecting device according to an embodiment of the present invention is applied. [Figure 2] This is a plan view showing the connection section of a work device connected using a two-part connecting device with the lower boom tilted forward. [Figure 3]It is a left side view showing a working device separated between a lower boom and an upper boom together with a swivel frame. [Figure 4] It is a left side view showing an enlarged view of the lower boom, upper boom, etc. in FIG. 3. [Figure 5] It is a front view showing the tip of the lower boom in FIG. 4 from the front side. [Figure 6] It is a front view showing the tip of the lower boom in a state where the connecting pin has been removed by a pin removal mechanism from the same position as in FIG. 5. [Figure 7] It is a rear view showing the base end portion of the upper boom in FIG. 4 from the rear side. [Figure 8] It is an operation explanatory view showing a state where the upper boom is approaching the lower boom. [Figure 9] It is an operation explanatory view showing a state where the left stopper member of the upper boom is abutted against the left first bracket of the lower boom. [Figure 10] It is an operation explanatory view showing the positional relationship between the upper left connecting pin and the left guide member in a state where the left stopper member (right stopper member) of the upper boom is abutted against the left first bracket (right first bracket) of the lower boom. [Figure 11] It is an operation explanatory view showing the positional relationship between the upper right connecting pin and the right guide member in a state where the left stopper member (right stopper member) of the upper boom is abutted against the left first bracket (right first bracket) of the lower boom. [Figure 12] It is an operation explanatory view showing a state where the upper boom is lowered and the upper right connecting pin is guided to the connecting position by the right guide member. [Figure 13] It is an operation explanatory view showing a state where the upper right connecting pin is inserted into the upper right first pin insertion hole and the upper right second pin insertion hole, and the upper boom is lowered and the lower right connecting pin is positioned at the connecting position by the right positioning member.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, taking the case where the two-member connecting device according to the embodiment of the present invention is applied to a multi-boom type hydraulic excavator as a construction machine as an example, it will be described in detail with reference to FIGS. 1 to 13. Specifically, the case where a lower boom as the first member (first boom) and an upper boom as the second member (second boom) are detachably connected by a two-member connecting device is illustrated. In the embodiment, the traveling direction of the hydraulic excavator is defined as the front-rear direction, and the lateral direction orthogonal to the traveling direction of the hydraulic excavator is defined as the left-right direction for explanation. Also, the up-down direction of the lower boom and the upper boom corresponds to the posture in which the lower boom and the upper boom are tilted forward.

[0016] In FIG. 1, a multi-boom type hydraulic excavator 1 includes a crawler type lower traveling body 2 capable of self-traveling in the front-rear direction, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a multi-boom type working device 8 (described later) provided on the front side of the upper revolving body 3. The hydraulic excavator 1 travels to the work site by the lower traveling body 2, and performs demolition work and the like at a high place away from the ground by rotating the working device 8 while rotating the upper revolving body 3.

[0017] The upper revolving body 3 includes a revolving frame 4 serving as a base, a cab 5 provided on the left front side of the revolving frame 4, a counterweight 6 provided on the rear side of the revolving frame 4, and a building cover 7 located in front of the counterweight 6 and accommodating an engine, a hydraulic pump, a cooling device, etc. (all not shown) provided on the revolving frame 4. A lower boom 9 of the working device 8 (described later) is provided on the front side of the revolving frame 4.

[0018] The multi-boom work device 8 is configured as a two-piece boom type work device in which the boom is divided in the longitudinal direction. The work device 8 is rotatably mounted on the front side of the slewing frame 4. The work device 8 includes a lower boom 9, an upper boom 10, a front boom 11 rotatably attached to the tip of the upper boom 10, an arm 12 rotatably attached to the tip of the front boom 11, and a crusher 13 as a work tool rotatably attached to the tip of the arm 12. The crusher 13 can be replaced with other work tools such as a cutter, breaker, fork, or fork grapple.

[0019] Furthermore, two boom cylinders 14 (see Figure 2) are provided between the slewing frame 4 and the lower boom 9, flanking the lower boom 9, and a jib cylinder 15 is provided between the upper boom 10 and the front boom 11. In addition, an arm cylinder 16 is provided between the front boom 11 and the arm 12, and a work tool cylinder 17 is provided between the arm 12 and the crusher 13.

[0020] The lower boom 9, as the first boom, constitutes the first member. The lower boom 9 is formed from a rectangular tubular fabricated body having a square cross-sectional shape overall. The lower boom 9 consists of a left side portion 9A, a right side portion 9B, an upper portion 9C, and a lower portion 9D, and the tip portion facing the upper boom 10 is closed by a tip portion 9E. The tip portion 9E of the lower boom 9 is inclined towards the rear from the top to the bottom. That is, the tip portion 9E forms an acute angle with respect to the upper portion 9C and an obtuse angle with respect to the lower portion 9D.

[0021] On the other hand, the base end (slewing frame 4 side) of the lower boom 9 is rotatably attached to the front side of the slewing frame 4. Different attachments such as a two-piece boom front and a high-lift front can be selectively attached to the tip side of the lower boom 9 depending on the work to be done (in this embodiment, a two-piece boom front is attached).

[0022] The upper boom 10, acting as the second boom, constitutes the second member. The upper boom 10 is formed from a rectangular tubular fabricated body having a square cross-sectional shape overall. The upper boom 10 consists of a left side portion 10A, a right side portion 10B, an upper portion 10C, and a lower portion 10D, and the base end portion that faces the lower boom 9 is closed by the base end portion 10E.

[0023] The base end surface 10E of the upper boom 10 is inclined towards the rear, from top to bottom, corresponding to the tip side of the lower boom 9. That is, the base end surface 10E faces the lower boom 9 and the upper boom 10 with a certain distance between them in the connected state shown in Figure 13.

[0024] Here, as shown in Figure 3, when transporting the hydraulic excavator 1 to the work site, for example, the long working device 8 is disassembled into multiple parts and loaded onto separate transport vehicles for transport to the work site. Specifically, the assembly (two-piece boom front) consisting of the upper boom 10, front boom 11, arm 12, jib cylinder 15, and arm cylinder 16 is detached from the lower boom 9 and transported. When attaching this assembly to the lower boom 9, the assembly is lifted by a hydraulic crane (not shown) and the upper boom 10 is moved toward the connection position with the lower boom 9. At the connection position, the base end of the upper boom 10 is connected to the tip end of the lower boom 9 using the two-member connecting device 21 described later. That is, in this embodiment, the case in which the lower boom 9 is applied as the first member and the upper boom 10 is applied as the second member is illustrated.

[0025] Next, the configuration of the two-member connecting device 21 according to this embodiment and the connection work (procedure) using the two-member connecting device 21 will be described in detail.

[0026] The two-member connecting device 21 connects the lower boom 9 (first member) as the first boom and the upper boom 10 (second member) as the second boom. As shown in Figures 4 to 7, the two-member connecting device 21 is composed of the following components: left first bracket 22, right first bracket 23, upper left first pin insertion hole 22D, lower left first pin insertion hole 22E, upper right first pin insertion hole 23D, lower right first pin insertion hole 23E, left second bracket 24, right second bracket 25, upper left second pin insertion hole 24C, lower left second pin insertion hole 24D, upper right second pin insertion hole 25C, lower right second pin insertion hole 25D, upper left connecting pin 26, upper right connecting pin 27, lower left connecting pin 28, lower right connecting pin 29, left guide member 32, right guide member 33, left stopper member 36, and right stopper member 37.

[0027] The left first bracket 22, which serves as the first bracket, is provided on the tip side of the lower boom 9. The left first bracket 22 is positioned on the left side of the lower boom 9, closer to the left side surface 9A. As shown in Figures 5 and 6, the left first bracket 22 is composed of a pair of left outer brackets 22A and left inner brackets 22B facing each other with a certain distance between them (the distance for clamping the left second bracket 24) on the outside and inside in the left-right direction. Here, the left outer bracket 22A and the left inner bracket 22B are each formed using a steel plate or the like that has sufficient strength. The space between the left outer bracket 22A and the left inner bracket 22B is a left gap 22C into which the left second bracket 24 is inserted.

[0028] As shown in Figure 2, the left outer bracket 22A is formed on the tip side of the lower boom 9 so as to be flush with the left side surface 9A. As shown in Figure 8, the left outer bracket 22A extends forward from the tip surface 9E and has an upper boss 22A1 on the upper surface 9C side and a lower boss 22A2 on the lower surface 9D side. Furthermore, there is a curved section 22A3 between the upper boss 22A1 and the lower boss 22A2 that smoothly connects the upper boss 22A1 and the lower boss 22A2.

[0029] As shown in Figures 5 and 6, the left inner bracket 22B is positioned facing the inside (right side) of the left outer bracket 22A and is attached to the tip side of the lower boom 9. As shown in Figure 10, the left inner bracket 22B, like the left outer bracket 22A, extends forward from the tip surface 9E and has an upper boss 22B1 on the upper surface 9C side and a lower boss 22B2 on the lower surface 9D side. Furthermore, there is a curved section 22B3 between the upper boss 22B1 and the lower boss 22B2 that smoothly connects them.

[0030] The upper parts of the left outer bracket 22A and the left inner bracket 22B, i.e., the upper bosses 22A1 and 22B1, each have a left upper first pin insertion hole 22D drilled on the same axis extending in the left-right direction. The lower parts of the left outer bracket 22A and the left inner bracket 22B, i.e., the lower bosses 22A2 and 22B2, each have a left lower first pin insertion hole 22E drilled on the same axis extending in the left-right direction. The left upper connecting pin 26, described later, is removably inserted into the left upper first pin insertion hole 22D, and the left lower connecting pin 28, described later, is removably inserted into the left lower first pin insertion hole 22E.

[0031] The right first bracket 23, which serves as the first bracket, is provided on the tip side of the lower boom 9. The right first bracket 23 is positioned on the right side of the lower boom 9, closer to the right side surface 9B. As shown in Figures 5 and 6, the right first bracket 23 is composed of a pair of right outer brackets 23A and right inner brackets 23B facing each other with a certain distance between them (the distance for clamping the right second bracket 25) on the outer and inner sides in the left-right direction. Here, the right outer bracket 23A and the right inner bracket 23B are each formed using a steel plate or the like that has sufficient strength. The space between the right outer bracket 23A and the right inner bracket 23B is a right gap 23C into which the right second bracket 25 is inserted.

[0032] As shown in Figure 2, the right outer bracket 23A is formed on the tip side of the lower boom 9 so as to be flush with the right side surface 9B. The right outer bracket 23A extends forward from the tip surface 9E and has an upper boss 23A1 on the upper surface 9C side and a lower boss 23A2 on the lower surface 9D side. Furthermore, there is a curved section 23A3 between the upper boss 23A1 and the lower boss 23A2 that smoothly connects the upper boss 23A1 and the lower boss 23A2.

[0033] The right inner bracket 23B is positioned facing the inside (left side) of the right outer bracket 23A and is attached to the tip side of the lower boom 9. As shown in Figure 11, the right inner bracket 23B, like the right outer bracket 23A, extends forward from the tip surface 9E and has an upper boss 23B1 on the upper surface 9C side and a lower boss 23B2 on the lower surface 9D side. Furthermore, there is a curved section 23B3 between the upper boss 23B1 and the lower boss 23B2 that smoothly connects them.

[0034] The upper parts of the right outer bracket 23A and the right inner bracket 23B, i.e., the upper bosses 23A1 and 23B1, each have an upper right first pin insertion hole 23D drilled on the same axis extending in the left-right direction (only the right inner bracket 23B side is shown). The lower parts of the right outer bracket 23A and the right inner bracket 23B, i.e., the lower bosses 23A2 and 23B2, each have a lower right first pin insertion hole 23E drilled on the same axis extending in the left-right direction (only the right inner bracket 23B side is shown). The upper right connecting pin 27, described later, is removably inserted into the upper right first pin insertion hole 23D, and the lower right connecting pin 29, described later, is removably inserted into the lower right first pin insertion hole 23E.

[0035] As shown in Figures 2, 4, and 8, the left second bracket 24, which serves as the second bracket, is provided on the base end side of the upper boom 10. The left second bracket 24 is positioned on the left side of the upper boom 10, closer to the left side surface portion 10A. When the lower boom 9 and the upper boom 10 are connected, the left second bracket 24 is inserted into the left gap 22C between the pair of left outer brackets 22A and left inner bracket 22B that constitute the left first bracket 22. As shown in Figure 10, the left second bracket 24 is formed using a strong steel plate or the like and extends rearward from the base end surface portion 10E. The left second bracket 24 has an upper boss 24A on the upper surface portion 10C side and a lower boss 24B on the lower surface portion 10D side.

[0036] The upper part of the left second bracket 24, i.e., the upper boss 24A, has a left upper second pin insertion hole 24C that communicates with the left upper first pin insertion hole 22D at the connection position between the lower boom 9 and the upper boom 10 (the position shown in Figures 12 and 13). The lower part of the left second bracket 24, i.e., the lower boss 24B, has a left lower second pin insertion hole 24D that communicates with the left lower first pin insertion hole 22E at the connection position shown in Figure 13. The left upper connecting pin 26, described later, is removably inserted into the left upper second pin insertion hole 24C, and the left lower connecting pin 28, described later, is removably inserted into the left lower second pin insertion hole 24D.

[0037] The right second bracket 25, which serves as the second bracket, is provided on the base end side of the upper boom 10. The right second bracket 25 is positioned on the right side of the upper boom 10, closer to the right side surface 10B. When the lower boom 9 and the upper boom 10 are connected, the right second bracket 25 is inserted into the right gap 23C between the pair of right outer brackets 23A and right inner bracket 23B that constitute the right first bracket 23. As shown in Figure 11, the right second bracket 25 is formed using a strong steel plate or the like and extends rearward from the base end surface 10E. The right second bracket 25 has an upper boss 25A on the upper surface 10C side and a lower boss 25B on the lower surface 10D side.

[0038] The upper part of the right second bracket 25, i.e., the upper boss 25A, has a right second pin insertion hole 25C that communicates with the right first pin insertion hole 23D at the connection point between the lower boom 9 and the upper boom 10. The lower part of the right second bracket 25, i.e., the lower boss 25B, has a right second pin insertion hole 25D that communicates with the right lower first pin insertion hole 23E at the connection point. The right upper connecting pin 27, described later, is removably inserted into the right second pin insertion hole 25C, and the right lower connecting pin 29, described later, is removably inserted into the right second pin insertion hole 25D.

[0039] Here, the upper left second pin insertion hole 24C of the left second bracket 24 and the upper right second pin insertion hole 25C of the right second bracket 25 can be positioned on the same axis as the upper left first pin insertion hole 22D of the left first bracket 22 and the upper right first pin insertion hole 23D of the right first bracket 23. Also, the lower left second pin insertion hole 24D of the left second bracket 24 and the lower right second pin insertion hole 25D of the right second bracket 25 can be positioned on the same axis as the lower left first pin insertion hole 22E of the left first bracket 22 and the lower right first pin insertion hole 23E of the right first bracket 23. Furthermore, a left guide member 32, a right guide member 33, a left positioning member 34, and a right positioning member 35, which will be described later, are provided between the left second bracket 24 and the right second bracket 25.

[0040] The upper left connecting pin 26, acting as a connecting pin, is inserted into the upper left first pin insertion hole 22D and the upper left second pin insertion hole 24C from the left inner bracket 22B side of the left first bracket 22. The upper left connecting pin 26 is formed as a cylindrical body extending in the left-right direction. The upper left connecting pin 26 is inserted and removed between a detached position (position in Figure 6) where only the tip located on the outside in the left-right direction is inserted into the upper left first pin insertion hole 22D of the left inner bracket 22B, and an inserted position (position in Figure 5) where it penetrates the upper left first pin insertion hole 22D of the left inner bracket 22B and is inserted to the upper left first pin insertion hole 22D of the left outer bracket 22A. The portion of the upper left connecting pin 26 that protrudes inward from the left inner bracket 22B in the detached position shown in Figure 6 can engage with the left guide member 32, which will be described later.

[0041] The upper right connecting pin 27, acting as a connecting pin, is inserted into the upper right first pin insertion hole 23D and the upper right second pin insertion hole 25C from the right inner bracket 23B side of the right first bracket 23. The upper right connecting pin 27 is formed as a cylindrical body extending in the left-right direction. The upper right connecting pin 27 is inserted and removed between a detached position (position in Figure 6) where only the tip located on the outside in the left-right direction is inserted into the upper right first pin insertion hole 23D of the right inner bracket 23B, and an inserted position (position in Figure 5) where it penetrates the upper right first pin insertion hole 23D of the right inner bracket 23B and is inserted into the upper right first pin insertion hole 23D of the right outer bracket 23A. The portion of the upper right connecting pin 27 that protrudes inward from the right inner bracket 23B in the detached position shown in Figure 6 can engage with the right guide member 33, which will be described later.

[0042] The lower left connecting pin 28, acting as a connecting pin, is inserted from the left inner bracket 22B side of the left first bracket 22 into the lower left first pin insertion hole 22E and the lower left second pin insertion hole 24D. The lower left connecting pin 28 is formed as a cylindrical body extending in the left-right direction. The lower left connecting pin 28 is inserted and removed between a detached position (position in Figure 6) where only the tip located on the outside in the left-right direction is inserted into the lower left first pin insertion hole 22E of the left inner bracket 22B, and an inserted position (position in Figure 5) where it penetrates the lower left first pin insertion hole 22E of the left inner bracket 22B and is inserted into the lower left first pin insertion hole 22E of the left outer bracket 22A. In the detached position shown in Figure 6, the portion of the lower left connecting pin 28 that protrudes inward from the left inner bracket 22B can engage with the left position fixing member 34, which will be described later.

[0043] The lower right connecting pin 29, acting as a connecting pin, is inserted from the right inner bracket 23B side of the right first bracket 23 into the lower right first pin insertion hole 23E and the lower right second pin insertion hole 25D. The lower right connecting pin 29 is formed as a cylindrical body extending in the left-right direction. The lower right connecting pin 29 is inserted and removed between a detached position (position in Figure 6) where only the tip located on the outside in the left-right direction is inserted into the lower right first pin insertion hole 23E of the right inner bracket 23B, and an inserted position (position in Figure 5) where it penetrates the lower right first pin insertion hole 23E of the right inner bracket 23B and is inserted into the lower right first pin insertion hole 23E of the right outer bracket 23A. In the detached position shown in Figure 6, the portion of the lower right connecting pin 29 that protrudes inward from the right inner bracket 23B can engage with the right position fixing member 35, which will be described later.

[0044] The upper pin insertion / removal mechanism 30 is provided between the left first bracket 22 and the right first bracket 23. The upper pin insertion / removal mechanism 30 inserts and removes the upper left connecting pin 26 into the upper left first pin insertion hole 22D of the left first bracket 22 and the upper left second pin insertion hole 24C of the left second bracket 24, and inserts and removes the upper right connecting pin 27 into the upper right first pin insertion hole 23D of the right first bracket 23 and the upper right second pin insertion hole 25C of the right second bracket 25. The upper pin insertion / removal mechanism 30 is composed of a hydraulic cylinder 30A, a floating link 30B, a left link 30C, and a right link 30D.

[0045] The hydraulic cylinder 30A is positioned at a predetermined distance from the upper left connecting pin 26 and the upper right connecting pin 27, for example, at a position separated downwards, extending in the left-right direction. The floating link 30B is provided in a floating state (able to move freely) between the upper left connecting pin 26, the upper right connecting pin 27 and the hydraulic cylinder 30A, extending in the left-right direction parallel to the hydraulic cylinder 30A.

[0046] The left link 30C has a rotatable attachment to the left side of the floating link 30B in its middle length (vertical direction), a rotatable attachment to the left end of the hydraulic cylinder 30A at its lower end, and a rotatable attachment to the base end of the upper left connecting pin 26 at its upper end. The right link 30D has a symmetrical shape to the left link 30C in the left-right direction, with a rotatable attachment to the right side of the floating link 30B in its middle length (vertical direction), a rotatable attachment to the right end of the hydraulic cylinder 30A at its lower end, and a rotatable attachment to the base end of the upper right connecting pin 27 at its upper end.

[0047] As a result, the upper pin insertion / removal mechanism 30 extends the hydraulic cylinder 30A and rotates the left link 30C, allowing the upper left connecting pin 26 to be pulled out from the upper left first pin insertion hole 22D of the left outer bracket 22A and the upper left second pin insertion hole 24C of the left second bracket 24. Simultaneously, by rotating the right link 30D, the upper right connecting pin 27 can be pulled out from the upper right first pin insertion hole 23D of the right outer bracket 23A and the upper right second pin insertion hole 25C of the right second bracket 25. At this time, the upper pin insertion / removal mechanism 30 leaves only the tip of the upper left connecting pin 26 in the upper left first pin insertion hole 22D of the left inner bracket 22B, and only the tip of the upper right connecting pin 27 in the upper right first pin insertion hole 23D of the right inner bracket 23B (the detached position shown in Figure 6).

[0048] On the other hand, the upper pin insertion / removal mechanism 30, by retracting the hydraulic cylinder 30A, allows the left link 30C to insert the upper left connecting pin 26 into the upper left first pin insertion hole 22D and the upper left second pin insertion hole 24C, and the right link 30D allows the upper right connecting pin 27 to insert into the upper right first pin insertion hole 23D and the upper right second pin insertion hole 25C (insertion positions shown in Figure 5).

[0049] The lower pin insertion / removal mechanism 31, like the upper pin insertion / removal mechanism 30, is provided between the left first bracket 22 and the right first bracket 23. The lower pin insertion / removal mechanism 31 inserts and removes the left lower connecting pin 28 into the left lower first pin insertion hole 22E of the left first bracket 22 and the left lower second pin insertion hole 24D of the left second bracket 24, and inserts and removes the right lower connecting pin 29 into the right lower first pin insertion hole 23E of the right first bracket 23 and the right lower second pin insertion hole 25D of the right second bracket 25. The lower pin insertion / removal mechanism 31 is composed of a hydraulic cylinder 31A, a floating link 31B, a left link 31C, and a right link 31D.

[0050] The hydraulic cylinder 31A is positioned at a predetermined distance from the lower left connecting pin 28 and the lower right connecting pin 29, for example, at a position separated upward, extending in the left-right direction. The floating link 31B is provided in a floating state (freely movable state) between the lower left connecting pin 28, the lower right connecting pin 29 and the hydraulic cylinder 31A, extending in the left-right direction parallel to the hydraulic cylinder 31A.

[0051] The left link 31C has a rotatable attachment to the left side of the floating link 31B in its middle length (vertical direction), a rotatable attachment to the left end of the hydraulic cylinder 31A at its upper end, and a rotatable attachment to the base end of the lower left connecting pin 28 at its lower end. The right link 31D has a symmetrical shape to the left link 31C in the left-right direction, with a rotatable attachment to the right side of the floating link 31B in its middle length (vertical direction), a rotatable attachment to the right end of the hydraulic cylinder 31A at its upper end, and a rotatable attachment to the base end of the lower right connecting pin 29 at its lower end.

[0052] As a result, the lower pin insertion / removal mechanism 31 extends the hydraulic cylinder 31A and rotates the left link 31C, allowing the lower left connecting pin 28 to be pulled out from the lower left first pin insertion hole 22E of the left outer bracket 22A and the lower left second pin insertion hole 24D of the left second bracket 24. Simultaneously, by rotating the right link 31D, the lower right connecting pin 29 can be pulled out from the lower right first pin insertion hole 23E of the right outer bracket 23A and the lower right second pin insertion hole 25D of the right second bracket 25. At this time, the lower pin insertion / removal mechanism 31 leaves only the tip of the lower left connecting pin 28 in the lower left first pin insertion hole 22E of the left inner bracket 22B, and only the tip of the lower right connecting pin 29 in the lower right first pin insertion hole 23E of the right inner bracket 23B (the detached position shown in Figure 6).

[0053] On the other hand, the lower pin insertion / removal mechanism 31, by retracting the hydraulic cylinder 31A, allows the left lower connecting pin 28 to be inserted into the left lower first pin insertion hole 22E and the left lower second pin insertion hole 24D by the left link 31C, and the right lower connecting pin 29 to be inserted into the right lower first pin insertion hole 23E and the right lower second pin insertion hole 25D by the right link 31D (insertion positions shown in Figure 5).

[0054] As shown in Figures 7 and 10, the left guide member 32, which serves as a guide member, is provided on the left side of the base end of the upper boom 10. When the left second bracket 24 is brought close to the left first bracket 22, the left guide member 32 engages with the left upper connecting pin 26 and guides the left second bracket 24 to the connecting position (a position where the left upper connecting pin 26 is coaxial with the left first pin insertion hole 22D and the left second pin insertion hole 24C).

[0055] The left guide member 32 is positioned to face the left inner bracket 22B in the left-right direction when the left second bracket 24 is inserted into the left gap 22C between the left outer bracket 22A and the left inner bracket 22B. The left guide member 32 is formed as a plate that extends in the vertical direction and protrudes rearward from the base end surface 10E of the upper boom 10.

[0056] As shown in Figure 10, the left guide member 32 comprises a concave arc portion 32A that matches the arc shape of the upper part of the upper left second pin insertion hole 24C when the upper boom 10 etc. is lifted in a horizontal position, and a front guide portion 32B on the base end surface portion 10E side and a rear guide portion 32C on the opposite side that expand in the front-rear direction downward from the concave arc portion 32A. The left guide member 32 can guide the upper left connecting pin 26 to a position coaxial with the concave arc portion 32A, i.e., the upper left second pin insertion hole 24C, by bringing the front guide portion 32B or the rear guide portion 32C, which are arranged in an inverted V shape, into contact with the upper left connecting pin 26 from above, using the slanted edges of the front guide portion 32B and the rear guide portion 32C. In this case, the left guide member 32 engages with the upper left connecting pin 26 in a detached position that protrudes inward (to the right) from the left inner bracket 22B.

[0057] As shown in Figures 7 and 11, the right guide member 33, which serves as a guide member, is provided on the right side of the base end of the upper boom 10. When the right second bracket 25 is brought close to the right first bracket 23, the right guide member 33 engages with the upper right connecting pin 27 and guides the right second bracket 25 to the connecting position (a position where the upper right connecting pin 27 is coaxial with the upper right first pin insertion hole 23D and the upper right second pin insertion hole 25C).

[0058] The right guide member 33 is positioned to face the right inner bracket 23B in the left-right direction when the right second bracket 25 is inserted between the right outer bracket 23A and the right inner bracket 23B. The right guide member 33 is formed as a plate that extends vertically and protrudes rearward from the base end surface 10E of the upper boom 10.

[0059] As shown in Figure 11, the right guide member 33 has a concave arc portion 33A that matches the arc shape of the upper right second pin insertion hole 25C when the upper boom 10 etc. is lifted in a horizontal position, and a front guide portion 33B on the base end surface portion 10E side and a rear guide portion 33C on the opposite side that expand in the front-rear direction downward from the concave arc portion 33A. The right guide member 33 can guide the upper right connecting pin 27 to a position coaxial with the concave arc portion 33A, i.e., the upper right second pin insertion hole 25C, by bringing the front guide portion 33B or the rear guide portion 33C, which are arranged in an inverted V shape, into contact with the upper right connecting pin 27 from above, using the slanted edges of the front guide portion 33B and the rear guide portion 33C. In this case, the right guide member 33 engages with the upper right connecting pin 27 in a detached position that protrudes inward (left side) from the right inner bracket 23B.

[0060] In this way, the left guide member 32 aligns the axis of the upper left connecting pin 26 with the axis of the upper left second pin insertion hole 24C of the left second bracket 24, allowing the upper left connecting pin 26 to be smoothly inserted into the upper left second pin insertion hole 24C by the upper pin insertion mechanism 30.

[0061] Similarly, the right guide member 33 aligns the axis of the upper right connecting pin 27 with the axis of the upper right second pin insertion hole 25C of the right first bracket 23, thereby allowing the upper right connecting pin 27 to be smoothly inserted into the upper right second pin insertion hole 25C by the upper pin insertion mechanism 30.

[0062] As shown in Figures 7 and 10, the left positioning member 34 is located on the left side of the base end of the upper boom 10. The left positioning member 34 aligns the axis of the left lower connecting pin 28 with the axis of the left lower second pin insertion hole 24D, which is provided in the left second bracket 24, so that the left lower connecting pin 28 can be easily inserted into the left lower second pin insertion hole 24D.

[0063] The left positioning member 34 is positioned to face the left inner bracket 22B in the left direction when the left second bracket 24 is positioned in the left gap 22C between the left outer bracket 22A and the left inner bracket 22B. The left positioning member 34 is formed as a triangular plate that extends in the vertical direction and protrudes rearward from the base end surface 10E of the upper boom 10.

[0064] The left positioning member 34 has a concave arc portion 34A at its rear end. This concave arc portion 34A is centered on the upper left connecting pin 26, which connects the upper boss 22A1 of the left outer bracket 22A constituting the left first bracket 22, the upper boss 22B1 of the left inner bracket 22B, and the upper boss 24A of the left second bracket 24. When the lower part of the upper boom 10 rotates to the rear, it contacts the lower left connecting pin 28 in the detached position. As a result, the left positioning member 34 can align the axis of the lower left connecting pin 28 with the axis of the lower left second pin insertion hole 24D.

[0065] As shown in Figures 7 and 11, the right positioning member 35 is located on the right side of the base end of the upper boom 10. The right positioning member 35 aligns the axis of the right lower connecting pin 29 with the axis of the right lower second pin insertion hole 25D, which is provided in the right second bracket 25, so that the right lower connecting pin 29 can be easily inserted into the right lower second pin insertion hole 25D.

[0066] The right positioning member 35 is positioned to face the right inner bracket 23B in the left-right direction when the right second bracket 25 is positioned in the right gap 23C between the right outer bracket 23A and the right inner bracket 23B. The right positioning member 35 is formed as a triangular plate that extends in the vertical direction and protrudes rearward from the base end surface 10E of the upper boom 10.

[0067] The right positioning member 35 has a concave arc portion 35A at its rear end. This concave arc portion 35A is centered on the upper right connecting pin 27, which connects the upper boss 23A1 of the right outer bracket 23A constituting the right first bracket 23, the upper boss 23B1 of the right inner bracket 23B, and the upper boss 25A of the right second bracket 25. When the lower part of the upper boom 10 rotates to the rear, it contacts the lower right connecting pin 29 in the detached position, as shown in Figure 13. This allows the right positioning member 35 to align the axis of the lower right connecting pin 29 with the axis of the lower right second pin insertion hole 25D.

[0068] In this way, the left positioning member 34 aligns the axis of the left lower connecting pin 28 with the axis of the left lower second pin insertion hole 24D, allowing the left lower connecting pin 28 to be smoothly inserted into the left lower first pin insertion hole 22E of the left first bracket 22 and the left lower second pin insertion hole 24D of the left second bracket 24 by the lower pin insertion mechanism 31.

[0069] Similarly, the right positioning member 35 aligns the axis of the right lower connecting pin 29 with the axis of the right lower second pin insertion hole 25D, thereby allowing the right lower connecting pin 29 to be smoothly inserted into the right lower first pin insertion hole 23E of the right first bracket 23 and the right lower second pin insertion hole 25D of the right second bracket 25 by the lower pin insertion mechanism 31.

[0070] Next, the configuration and function of the left stopper member 36 and the right stopper member 37, which are characteristic features of this embodiment, will be described.

[0071] As shown in Figure 2, the left stopper member 36, acting as a stopper member, is provided on the outer surface (left side) of the left second bracket 24, which faces the left outer bracket 22A of the left first bracket 22. When the upper boom 10 is moved laterally (front-back and horizontally) and approaches the lower boom 9 (moving in the direction of the arrow in Figure 8), the left stopper member 36 contacts the left first bracket 22 at the position where the left guide member 32 reaches the upper left connecting pin 26 (the position shown in Figure 10), and restricts the movement of the upper boom 10 at this position.

[0072] The left stopper member 36 consists of a rectangular parallelepiped-shaped thick plate member that protrudes to the left from the left side surface portion 10A of the upper boom 10. When the upper boom 10 and the like are in the suspension position shown in Figures 3 and 4, the left stopper member 36 is positioned in front of and below the upper left second pin insertion hole 24C of the left second bracket 24. In other words, when the upper boom 10 is brought close to the lower boom 9, the left stopper member 36 is positioned to contact the upper boss 22A1 of the left outer bracket 22A before the upper left connecting pin 26 contacts the front guide portion 32B of the left guide member 32.

[0073] Furthermore, since the left stopper member 36 is provided on the left side surface portion 10A of the upper boom 10, the distance between it and the upper boss 22A1 of the left outer bracket 22A can be easily visually inspected from the outside. In addition, the left stopper member 36 is positioned to avoid interference with the curved portion 22A3 of the left outer bracket 22A.

[0074] The right stopper member 37, acting as a stopper member, is provided on the outer surface (right surface) of the right second bracket 25, which faces the right outer bracket 23A of the right first bracket 23 (see Figures 2 and 7). When the upper boom 10 is moved laterally (front-back and horizontally) and approaches the lower boom 9 (moving in the direction of the arrow in Figure 8), the right stopper member 37 contacts the right first bracket 23 at the position where the right guide member 33 reaches the upper right connecting pin 27 (the position shown in Figure 11), and restricts the movement of the upper boom 10 at this position.

[0075] The right stopper member 37 consists of a rectangular parallelepiped-shaped thick plate member that protrudes to the right from the right side portion 10B of the upper boom 10. When the upper boom 10 and the like are in the suspension position shown in Figures 3 and 4, the right stopper member 37 is positioned in front of and below the upper right second pin insertion hole 25C of the right second bracket 25. In other words, when the upper boom 10 is brought close to the lower boom 9, the right stopper member 37 is positioned to contact the upper boss 23A1 of the right outer bracket 23A before the upper right connecting pin 27 contacts the front guide portion 33B of the right guide member 33.

[0076] Furthermore, since the right stopper member 37 is provided on the right side portion 10B of the upper boom 10, the distance to the upper boss 23A1 of the right outer bracket 23A can be easily visually inspected from the outside. In addition, the right stopper member 37 is positioned to avoid interference with the curved portion 23A3 of the right outer bracket 23A.

[0077] The two-member connecting device 21 according to this embodiment has the configuration described above. Next, an example of the work procedure when connecting the upper boom 10 to the tip side of the lower boom 9 of the hydraulic excavator 1 using the two-member connecting device 21 will be described.

[0078] First, we will describe the preparatory work before performing the coupling operation. As shown in Figures 3 and 4, the lower boom 9 is tilted forward, and as shown in Figure 6, the upper left coupling pin 26, upper right coupling pin 27, lower left coupling pin 28, and lower right coupling pin 29 are positioned in the detachment position.

[0079] Once preparations for the coupling operation are complete, a hydraulic crane (not shown) is used to lift the assembly consisting of the upper boom 10, front boom 11, arm 12, jib cylinder 15, arm cylinder 16, and work tool cylinder 17, as shown in Figure 3, and move this assembly laterally (horizontally) toward the lower boom 9. Specifically, as shown in Figure 8, the base end of the upper boom 10 is brought closer to the tip end of the lower boom 9.

[0080] At this time, by raising the position of the upper boom 10 higher than the position of the lower boom 9, the upper boss 22A1 of the left outer bracket 22A and the left stopper member 36 are positioned at the same height, and the upper boss 23A1 of the right outer bracket 23A and the right stopper member 37 are positioned at the same height. In this state, the upper boom 10 is brought closer to the lower boom 9, the left second bracket 24 is inserted into the left gap 22C between the left outer bracket 22A and the left inner bracket 22B of the left first bracket 22, and the right second bracket 25 is inserted into the right gap 23C between the right outer bracket 23A and the right inner bracket 23B of the right first bracket 23.

[0081] Furthermore, by bringing the upper boom 10 closer to the lower boom 9, the left stopper member 36 is brought into contact with the upper boss 22A1 of the left outer bracket 22A, as shown in Figure 9. Similarly, the right stopper member 37 is brought into contact with the upper boss 23A1 of the right outer bracket 23A. At this time, the distance between the left stopper member 36 and the upper boss 22A1 of the left outer bracket 22A, and the distance between the right stopper member 37 and the upper boss 23A1 of the right outer bracket 23A can be easily observed from the outside, allowing for gentle and quick contact to avoid a strong collision.

[0082] When the left stopper member 36 is in contact with the upper boss 22A1 of the left outer bracket 22A, and the right stopper member 37 is in contact with the upper boss 23A1 of the right outer bracket 23A, as shown in Figures 10 and 11, the concave arc portion 32A of the left guide member 32 is located above the upper left connecting pin 26, and the concave arc portion 33A of the right guide member 33 is located above the upper right connecting pin 27. Therefore, the movement of the upper boom 10 can be stopped before the upper left connecting pin 26 collides with the front guide portion 32B of the left guide member 32, and before the upper right connecting pin 27 collides with the front guide portion 33B of the right guide member 33.

[0083] After bringing the left stopper member 36 into contact with the upper boss 22A1 of the left outer bracket 22A, and the right stopper member 37 into contact with the upper boss 23A1 of the right outer bracket 23A, the upper boom 10 is lowered as shown in Figure 12. As a result, the upper left connecting pin 26 is positioned coaxially with the upper left second pin insertion hole 24C by the left guide member 32. Similarly, the upper right connecting pin 27 is positioned coaxially with the upper right second pin insertion hole 25C by the right guide member 33.

[0084] In this state, the upper left connecting pin 26 is inserted into the upper left first pin insertion hole 22D and the upper left second pin insertion hole 24C by the upper pin insertion mechanism 30. Similarly, the upper right connecting pin 27 is inserted into the upper right first pin insertion hole 23D and the upper right second pin insertion hole 25C. As a result, the upper bosses 22A1 and 22B1 of the left first bracket 22 and the upper boss 24A of the left second bracket 24 can be connected by the upper left connecting pin 26, and the upper bosses 23A1 and 23B1 of the right first bracket 23 and the upper boss 25A of the right second bracket 25 can be connected by the upper right connecting pin 27.

[0085] Next, the upper boom 10 is rotated downward (counterclockwise in Figure 12) around the upper left connecting pin 26 and the upper right connecting pin 27, causing the concave arc portion 34A of the left positioning member 34 to contact the lower left connecting pin 28. Similarly, as shown in Figure 13, the concave arc portion 35A of the right positioning member 35 is brought into contact with the lower right connecting pin 29. As a result, the lower left connecting pin 28 is positioned coaxially with the lower left second pin insertion hole 24D by the left positioning member 34. Similarly, the lower right connecting pin 29 is positioned coaxially with the lower right second pin insertion hole 25D by the right positioning member 35.

[0086] In this state, the lower left connecting pin 28 is inserted into the lower left first pin insertion hole 22E and the lower left second pin insertion hole 24D by the lower pin insertion mechanism 31. Similarly, the lower right connecting pin 29 is inserted into the lower right first pin insertion hole 23E and the lower right second pin insertion hole 25D. As a result, the lower bosses 22A2 and 22B2 of the left first bracket 22 and the lower boss 24B of the left second bracket 24 can be connected by the lower left connecting pin 28, and the lower bosses 23A2 and 23B2 of the right first bracket 23 and the lower boss 25B of the right second bracket 25 can be connected by the lower right connecting pin 29.

[0087] Thus, according to this embodiment, a left stopper member 36 is provided on the outer surface of the left second bracket 24 of the upper boom 10, which faces the left outer bracket 22A of the left first bracket 22. This stopper member 36 contacts the left first bracket 22 when the left guide member 32 reaches the left upper connecting pin 26, when the upper boom 10 is moved laterally and approaches the lower boom 9.

[0088] Similarly, a right stopper member 37 is provided on the outer surface of the right second bracket 25 of the upper boom 10, which faces the right outer bracket 23A of the right first bracket 23. This stopper member 37 contacts the right first bracket 23 when the right guide member 33 reaches the right upper connecting pin 27, when the upper boom 10 is moved laterally and approaches the lower boom 9.

[0089] Therefore, the distance between the upper left connecting pin 26 and the left guide member 32, and the distance between the upper right connecting pin 27 and the right guide member 33 can be easily determined from the outside. As a result, equipment such as a high-altitude work vehicle for looking at the distance between the connecting pins and guide members from above, as described in the prior art, becomes unnecessary. Consequently, the connection work between the lower boom 9 and the upper boom 10 can be easily performed.

[0090] Furthermore, the distance between the left stopper member 36 and the left outer bracket 22A, and the distance between the right stopper member 37 and the right outer bracket 23A can be easily seen from the outside, allowing for gentle and quick contact to avoid a strong collision. This prevents damage to the left guide member 32, the right guide member 33, the upper left connecting pin 26, and the upper right connecting pin 27.

[0091] In this embodiment, an upper pin insertion / removal mechanism 30 equipped with a hydraulic cylinder 30A is used to insert and remove the upper left connecting pin 26 into the upper left first pin insertion hole 22D of the left first bracket 22 and the upper left second pin insertion hole 24C of the left second bracket 24, and to insert and remove the upper right connecting pin 27 into the upper right first pin insertion hole 23D of the right first bracket 23 and the upper right second pin insertion hole 25C of the right second bracket 25. Furthermore, a lower pin insertion / removal mechanism 31 equipped with a hydraulic cylinder 31A is used to insert and remove the lower left connecting pin 28 into the lower left first pin insertion hole 22E of the left first bracket 22 and the lower left second pin insertion hole 24D of the left second bracket 24, and to insert and remove the lower right connecting pin 29 into the lower right first pin insertion hole 23E of the right first bracket 23 and the lower right second pin insertion hole 25D of the right second bracket 25.

[0092] However, the present invention is not limited to this, and for example, the configuration may involve manually inserting and removing all connecting pins into each pin insertion hole. Alternatively, the configuration may involve manually inserting and removing the upper or lower connecting pins into each pin insertion hole.

[0093] Furthermore, the embodiment illustrates a case where the lower boom 9 and upper boom 10 of the work device 8 are connected using a two-member connecting device 21. However, the present invention is not limited to this, and can be broadly applied to cases where the lower boom and insert boom, or the insert boom and upper boom, are connected by a two-member connecting device.

[0094] Furthermore, in the embodiments, a hydraulic excavator 1 equipped with a crawler-type lower travel body 2 was used as an example for explanation. However, the present invention is not limited to this and may also be applied to a hydraulic excavator equipped with a wheel-type lower travel body. [Explanation of Symbols]

[0095] 1. Hydraulic excavator (construction machinery) 2 Lower running body 3. Upper rotating body 8. Working equipment 9. Lower boom (first component, first boom) 10 Upper boom (second component, second boom) 21 2-member connecting device 22 Left first bracket (first bracket) 22A Left outer bracket 22B Left inner bracket 22C Left gap (gap) 22D Upper left first pin insertion hole (first pin insertion) 22E Lower left first pin insertion hole (first pin insertion) 23 Right first bracket (first bracket) 23A Right outer bracket 23B Right inner bracket 23C Right gap (gap) 23D Upper right first pin insertion hole (first pin insertion) 23E Lower right first pin insertion hole (first pin insertion) 24. Left second bracket (second bracket) 24C Upper left second pin insertion hole 24D Lower left second pin insertion hole 25 Right second bracket (second bracket) 25C Upper right second pin insertion hole 25D Lower right second pin insertion hole 26. Upper left connecting pin (connecting pin) 27 Upper right connecting pin (connecting pin) 28. Lower left connecting pin (connecting pin) 29. Lower right connecting pin (connecting pin) 32 Left guide member (guide member) 33 Right guide member (guide member) 36 Left stopper member 37 Right stopper member

Claims

1. A two-member connecting device that connects a first member and a second member, A pair of first brackets are provided on the first member, facing each other with a gap between them on the outer and inner sides in the left-right direction, The pair of first brackets each have a first pin insertion hole provided on the same axis, A second bracket provided on the second member and inserted into the gap between the pair of first brackets, A second pin insertion hole is provided in the second bracket and communicates with the first pin insertion hole at the connection position between the first member and the second member, A connecting pin is inserted from the inner first bracket side into the first pin insertion hole and the second pin insertion hole, A guide member provided on the second member engages with the connecting pin when the second bracket is brought close to the first bracket, and guides the second bracket to the connecting position, In a two-member connecting device comprising, A two-member connecting device characterized in that a stopper member is provided on the outer surface of the second bracket facing the outer first bracket, which contacts the first bracket when the second member is moved laterally and approaches the first member, and the guide member reaches the connecting pin.

2. A construction machine comprising: a self-propelled lower traveling body; an upper rotating body rotatably mounted on the lower traveling body; a multi-boom type working device provided on the front side of the upper rotating body and comprising a plurality of booms connected together; and a two-member connecting device that connects adjacent first booms and second booms among the plurality of booms, The two-member connecting device is, A pair of first brackets are provided on the first boom, facing each other with a gap between them on the outer and inner sides in the left-right direction, The pair of first brackets each have a first pin insertion hole provided on the same axis, A second bracket provided on the second boom and inserted into the gap between the pair of first brackets, A second pin insertion hole is provided in the second bracket and communicates with the first pin insertion hole at the connection position between the first boom and the second boom, A connecting pin is inserted from the inner first bracket side into the first pin insertion hole and the second pin insertion hole, A guide member provided on the second boom, which engages with the connecting pin when the second bracket is brought close to the first bracket, and guides the second bracket to the connecting position, Equipped with, A construction machine characterized in that a stopper member is provided on the outer surface of the second bracket facing the outer first bracket, which contacts the first bracket when the guide member reaches the connecting pin when the second boom is moved laterally and approaches the first boom.

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