JP2013067967A - Work attachment and work machine with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work attachment capable of reducing the space and cost for drawing connection pins out inward, and a work machine with the same.SOLUTION: The work attachment includes holding mechanisms 27A, 27B which hold respective connection pins 25A-26B movably between an insertion state in which the respective connection pins 25A-26B are inserted into respective pin holes 18b, 18c, and 24c-24f and an extraction state in which the respective connection pins 25A-26B come out of the pin holes 18b, 18c inward between fitting parts 24A, 24B; and operation mechanisms 29A, 29B which can switch and operate the holding mechanisms 27A, 27B between the insertion state and extraction state. The operation mechanisms 29A, 29B are connected to the respective holding mechanisms 27A, 27B so as to project to outside a first extension boom 8, and have operation members 29b which are pressed in from outside the first extension boom 8 to switch the respective holding mechanisms 27A, 27B from the extraction state to the insertion state.

Description

  The present invention relates to a work machine provided with a work attachment.

  2. Description of the Related Art Conventionally, there is known a work machine having a base machine and a work attachment attached to the base machine so as to be raised and lowered.

  Some working machines of this type have a work attachment that can be divided into a plurality of parts in consideration of convenience during transportation (for example, Patent Document 1).

  The hydraulic excavator described in Patent Document 1 is provided with a boom, a middle arm that is pivotally attached to the tip of the boom, an arm that is pivotally attached to the tip of the middle arm, and a tip that is turned around the tip of the arm. A crusher mounted movably. The boom can be divided into a lower boom, a joint boom, and an upper boom.

  Hereinafter, with reference to FIG. 7, the structure for connecting the lower boom and the joint boom described in Patent Document 1 will be described.

  A pair of left and right brackets 101 and 102 are provided at the base end portion of the joint boom. On the other hand, a pair of left and right brackets 103, 104, connecting pins 105, 106 for connecting the brackets 103, 104 and the brackets 101, 102, and connecting pins 105, 106 are provided at the tip of the lower boom. A mechanism (hereinafter referred to as an insertion / removal mechanism) for inserting / removing the brackets 101, 102 is provided.

  The insertion / extraction mechanism includes a first link 107 held between the brackets 103 and 104, a second link 108 and a third link 109 that are rotatably supported with respect to the first link 107, and a second link 108. And a hydraulic cylinder 110 for opening and closing the third link 109.

  The second link 108 is supported on the connecting pin 105 so as to be rotatable about the axis J11, and the second end is supported on the hydraulic cylinder 110 so as to be rotatable about the axis J14. And have. A portion of the second link 108 between the axis J11 and the axis J14 is supported so as to be rotatable around the axis J10 with respect to the first link 107. Similarly, the third link 109 is supported by a first end portion rotatably supported around the axis J13 with respect to the connecting pin 106, and a first end supported rotatably around the axis J15 with respect to the hydraulic cylinder 110. And two ends. A portion of the third link 109 between the axis J13 and the axis J15 is supported so as to be rotatable around the axis J12 with respect to the first link 107.

  Therefore, when the hydraulic cylinder 110 is reduced, the connecting pins 105 and 106 are separated from each other, and the connecting pins 105 and 106 are inserted into the pin holes 101a to 104a formed in the brackets 101 to 104, respectively. . Thereby, a lower boom and a joint boom are mutually connected.

  On the other hand, the extension of the hydraulic cylinder 110 causes the connecting pins 105 and 106 to approach each other and the connecting pins 105 and 106 come out of the pin holes 101a and 102a of the brackets 101 and 102, respectively. Thereby, a lower boom and a joint boom can be divided | segmented.

JP 2010-180692 A

  In the hydraulic excavator described in Patent Document 1, the connecting pins 105 and 106 are pulled out to the inside of the brackets 103 and 104. Therefore, compared with the case where each connecting pin 105, 106 is pulled out to the outside of each bracket 103, 104, the form after disassembly can be made compact, and the positions of the pin holes 103a, 104a and the pin holes 102a can be reduced. It can be easily confirmed from the side whether the position matches.

  However, in the hydraulic excavator described in Patent Document 1, the connecting pins 105 and 106 are inserted and removed using the hydraulic cylinder 110. For this reason, a space for arranging the hydraulic cylinder 110 and the hydraulic piping connected to the hydraulic cylinder 110 is required, and providing them is disadvantageous in terms of cost.

  An object of the present invention is to provide a work attachment that can reduce the space and cost for pulling out a connecting pin inward, and a work machine including the work attachment.

  In order to solve the above-described problems, the present invention provides a work attachment that is attached to a base machine of a work machine so as to be raised and lowered, and includes a first connecting body and a first right side projecting from the first connecting body. A first connecting body having a mounting portion and a first left mounting portion, a second connecting body, a second right mounting portion and a second left mounting portion protruding from the second connecting body. The first right-side mounting portion and the second right-side mounting portion are moved in the left-right direction through two connected bodies, a first right-side hole formed in the first right-side mounting portion, and a second right-side hole formed in the second right-side mounting portion. The right side connecting pin that can connect the first right side mounting part and the second right side mounting part by penetrating, the first left side hole formed in the first left side mounting part, and the second left side mounting part. The first left side mounting portion and the second left side through the second left side hole A left side connecting pin that can connect the first left side mounting part and the second left side mounting part by penetrating the attachment part in the left-right direction, and the first connection body are provided, and the right side connection pin is the first side connection pin. The inserted state inserted into the right hole and the second right hole, and the right connecting pin withdrawn to the left from the second right hole between the first right attachment part and the first left attachment part A right holding mechanism that movably holds the right connecting pin between the state and the first connecting body, and the left connecting pin is inserted into the first left hole and the second left hole. The left connecting pin is moved between an inserted state and an extracted state in which the left connecting pin is pulled out from the second left hole to the right between the first right attaching portion and the first left attaching portion. A left-side holding mechanism for holding the front and the first connecting body, An operation mechanism capable of switching the right-side holding mechanism and the left-side holding mechanism between the insertion state and the extraction state; and the operation mechanism is switched to the extraction state, and the first coupling body The right side holding mechanism and the left side holding mechanism are connected to at least one of the right side holding mechanism and the left side holding mechanism so as to protrude outward, and are pushed inward from the outside of the first connecting body. A work attachment having an operation member capable of switching at least one of the state from the extracted state to the inserted state.

  In the present invention, the right side holding mechanism and the left side holding mechanism have an operation mechanism that can be switched between an insertion state and an extraction state. Therefore, each connection pin can be extracted inward from the second right hole and the second left hole, respectively, by using the operation mechanism to place each holding mechanism in the extracted state. Therefore, according to the present invention, each connecting pin can be extracted inside without requiring a hydraulic cylinder and hydraulic piping connected thereto as in the prior art.

  In particular, according to the present invention, the first connection body is connected to at least one of the right-side holding mechanism and the left-side holding mechanism so as to protrude to the outside of the first connection body in the state switched to the extracted state. And an operation member that can switch at least one of the right side holding mechanism and the left side holding mechanism from the extracted state to the inserted state. Therefore, the operator who performs the connection work between the first connection body and the second connection body can easily recognize the operation member protruding outside the first connection body as an operation location for inserting the connection pin. After the connection between the first connection body and the second connection body, the operation member is pushed into the first connection body, thereby reducing the protruding height of the operation member from the first connection body, thereby realizing a compact form. can do.

  In the work attachment, the operation mechanism can switch the right side holding mechanism and the left side holding mechanism from the extracted state to the inserted state when the operating member is pushed inward from the outside of the first coupling body. It is preferable to further include a connecting member that connects the right holding mechanism and the left holding mechanism.

  In this aspect, the left and right connection pins can be inserted into the holes by an operation from one side of the first connection body. Therefore, workability can be improved compared to the case where the left and right connecting pins are inserted from the left and right positions of the first connected body.

  In the work attachment, in the holding mechanism to which the operation member is connected among the right side holding mechanism and the left side holding mechanism, the connecting pin held by the holding member is pushed into the inside from the outside of the first connecting body in the inserted state. It is preferable to have a link member that connects the connection pin and the operation member so that the operation member protrudes to the outside of the first connection body.

  In this aspect, the operating member can be protruded to the outside of the first connecting body by the connecting member being pushed into the inside from the outside of the first connecting body by the link member. That is, the holding mechanism can be switched to the extracted state by pushing the connecting pin from the outside to the inside of the first connecting body. Therefore, the holding mechanism can be switched between the extracted state and the inserted state only by pushing the operating member or the connecting pin.

  Therefore, according to the said aspect, since the tension | pulling operation which is hard to transmit force can be abbreviate | omitted, workability | operativity can be improved. Further, since the pulling operation can be omitted, it becomes unnecessary to form a handle portion for pulling on the operation member, and a more compact form can be realized.

  In the work attachment, the link member is rotatable about a first axis connected to the connecting pin and rotatable about a second axis parallel to the first axis while being rotatable about a first axis. And a second end connected to the operation member, and rotates about a third axis parallel to the first axis and the second axis at a position between the first end and the second end. It is preferable that the first connecting body is pivotally supported in a possible state.

  According to this aspect, the link member rotates about the third axis with respect to the first connection body, whereby the connection pin and the operation member can be moved in opposite directions. That is, by rotating the link member in one direction, the connecting pin can be moved toward the outside of the first connecting body and the operation member can be moved toward the inside of the first connecting body. On the other hand, by rotating the link member in the opposite direction, the connecting pin can be moved toward the inside of the first connecting body and the operation member can be moved toward the outside of the first connecting body. Therefore, by pushing one of the operating member and the connecting pin inward from the outside of the first connecting body, the other can be protruded to the outside of the first connecting body.

  In the embodiment, the right holding mechanism includes a right link member that connects the right connecting pin and the first connecting body, and the left holding mechanism connects the left connecting pin and the first connecting body. A left link member, and one of the right link member and the left link member is connected to the connection pin in a state of being rotatable about a first axis, and the first shaft. And a second end coupled to the operating member in a state of being rotatable about a second axis parallel to the first axis, and at a position between the first end and the second end. The other of the right side link member and the left side link member is supported by the first axis to the third axis, and is pivotally supported by the first coupling body so as to be rotatable around a third axis parallel to two axes. A fourth end connected to the connecting pin so as to be rotatable around a parallel fourth axis; A fifth end pivotally supported by the first connecting body in a state of being rotatable about a fifth axis parallel to the first to fourth axes, and the connecting member is connected to the right side connection in the inserted state. The right link member and the left link member are configured such that at least one of the pin and the left connecting pin is pushed inward from the outside of the first connecting body to project the operating member to the outside of the first connecting body. Are preferably connected.

  In this aspect, the right side holding mechanism and the left side holding mechanism each have a right side link member and a left side link member. Therefore, both connecting pins can be inserted into and removed from each right hole and each left hole in accordance with the rotation of both link members. Furthermore, in the said aspect, both link members are connected by the connection member so that an operation member may protrude outside the 1st connection body by a connection pin being pushed in from the outside of the 1st connection body in the insertion state. Yes. Therefore, each holding mechanism can be switched to the insertion state by pushing the operating member from the outside to the inside of the first connection body, while at least one of the right connection pin and the left connection pin is moved from the outside to the inside of the first connection body. By pushing in, the operation member can be protruded outside the first coupling body.

  The work attachment further includes a connection pin that is detachable from the first connecting body, is connected to the operation member, and a movement restriction member that restricts movement of at least one of the operation members relative to the first connection body. It is preferable to provide.

  In this aspect, the movement restriction member can restrict movement of at least one of the connection pin and the operation member relative to the first connection body. Therefore, it is possible to prevent the connecting pin and the operating member from moving unintentionally and switching the holding mechanism.

  In the work attachment, the operation member is provided at a penetrating portion that slidably penetrates the first right-side mounting portion or the first left-side mounting portion in a left-right direction, and an end portion of the penetrating portion. A restricting portion that regulates a pushing operation of the penetrating portion by contacting an outer surface of the first right side attaching portion or an outer side surface of the second right side attaching portion through which the penetrating portion penetrates. The outer surface of the part is disposed on the inner side of the outer surface of the main body, which is the outer surface of the first connected body, and the restricting portion has a thickness smaller than a distance between the outer surface of the attachment part and the outer surface of the main body. Preferably it has dimensions.

  In this aspect, the restricting portion provided at the end of the penetrating portion has a thickness dimension that is smaller than the distance between the outer surface of the attachment portion and the outer surface of the main body. As a result, the restricting portion can be accommodated inside the outer surface of the main body in a state where the operation member is pushed to the position restricted by the restricting portion. Therefore, a more compact configuration can be realized in a state where the operation member is pushed, that is, in a state where the holding mechanism is switched to the insertion state.

  In the work attachment, the operating member includes at least one of a penetrating portion that slidably penetrates the first right-side mounting portion or the first left-side mounting portion in the left-right direction, the right-side holding mechanism, and the left-side holding mechanism. It is preferable to have a restricting portion that restricts the pushing operation of the penetrating portion from the outside to the inside of the first coupling body at the position switched to the insertion state.

  In this aspect, the pushing operation of the penetrating portion is restricted at the position where the holding mechanism is switched to the insertion state. Therefore, the holding mechanism can be automatically switched to the insertion state by pushing the penetration part to a position regulated by the regulation part without being aware of the insertion depth of the penetration part.

  In addition, the present invention provides a work machine including a base machine and the work attachment attached to the mars machine so as to be raised and lowered.

  According to the present invention, it is possible to reduce the space and cost for pulling out the connecting pin inside.

It is a left view which shows the whole structure of the working machine which concerns on embodiment of this invention. It is a left view which shows the state which decomposed | disassembled some work attachments of FIG. It is a perspective view which shows the state which divided | segmented the main boom and the extension boom of FIG. It is the figure which looked at the extension boom of FIG. 3 from the back side. It is a perspective view which expands and shows the connection part of the main boom and extension boom of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is sectional drawing for demonstrating a prior art.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

  Referring to FIGS. 1 and 2, work machine 1 includes a self-propelled lower traveling body 2 having a crawler 2 a, an upper revolving body 3 that is turnably provided on lower traveling body 2, and an upper revolving body. 3 and a work attachment 4 attached to be undulating. In the present embodiment, the upper swing body 3 and the lower traveling body 2 constitute an example of a base machine.

  The upper swing body 3 includes a swing frame 5 attached to the lower traveling body 2 so as to be swingable about a vertical axis, and a cab 6 provided on the swing frame 5. In addition, it demonstrates below using the front-back and left-right direction seen from the operator who seated in the driver's seat (not shown) in the cab 6. FIG.

  The work attachment 4 includes a main boom 7 attached to the revolving frame 5 so as to be able to undulate around a left and right axis (not shown), and a first extension boom 8 connected to the tip of the main boom 7. The second extension boom 9 connected to the distal end portion of the first extension boom 8, the front boom 10 connected to the distal end portion of the second extension boom 9, and the left and right axis pivots. An inter boom 11 attached to the front end of the front boom 10, an arm 12 attached to the front end of the inter boom 11 so as to be rotatable about a left-right axis, and a front end of the arm 12 And a working machine (not shown) such as a crusher. The work attachment 4 includes a boom cylinder 14 that raises and lowers the main boom 7 with respect to the revolving frame 5, an inter boom cylinder 15 that rotates the inter boom 11 with respect to the front boom 10, and an arm with respect to the inter boom 11. An arm cylinder 16 that rotates 12 and a work machine cylinder 17 that rotates a work machine (not shown) with respect to the arm 12 are provided.

  The work attachment 4 is transported in a state where the main boom 7 and a portion ahead thereof are divided. The total length of the work attachment 4 can be adjusted by changing the number of additional booms attached between the main boom 7 and the front boom 10. In order to perform these functions, the front end portion of the main boom (an example of the second coupling body) 7 and the base end portion of the first extension boom (an example of the first coupling body) 8 can be attached and detached. A distal end portion of an extension boom (an example of a second connection body) 8 and a base end portion of a second extension boom (an example of a first connection body) 9 are detachable, and a second extension boom (an example of a second connection body) is detachable. ) The front end portion of 9 and the base end portion of the front boom (an example of the first connecting body) 10 are detachable. Further, one or more additional booms may be added to the first additional boom 8 and the second additional boom 9 as the first connection body and the second connection body. Conversely, at least one of the first additional boom 8 and the second additional boom 9 may be omitted.

  Hereinafter, the main boom 7 will be described as an example of the second connection body, and the first addition boom 8 will be described as an example of the first connection body.

  3 to 6, the main boom 7 includes a pair of side plates 18, 18 facing in the left-right direction, a top plate 19 connecting the upper ends of the side plates 18, 18, and the side plates 18, 18. The bottom plate 20 which connects between the lower end parts of is provided.

  Since the pair of side plates 18 and 18 have a bilaterally symmetric configuration, only one side plate 18 will be described, and description of the other side plate will be omitted. The side plate 18 has a mounting portion 18 a that protrudes to the tip side from the top plate 19 and the bottom plate 20. An upper pin hole 18b and a lower pin hole 18c are formed in the mounting portion 18a. The upper pin hole 18b and the lower pin hole 18c are holes that penetrate the mounting portion 18a in the left-right direction, respectively. In the present embodiment, an example of the second connecting body main body in which the parts other than the mounting portion 18a, the top plate 19 and the bottom plate 20 are assembled in a frame shape among the side plates 18 is configured. Each of the mounting portions 18a and 18a protruding from the distal end side constitutes an example of a second right side mounting portion and a second left side mounting portion.

  The first extension boom 8 connects a pair of side plates 21, 21 facing in the left-right direction, a top plate 22 that connects the upper ends of the side plates 21, 21, and the lower ends of the side plates 21, 21. A bottom plate 23 and a pair of left and right mounting portions 24A and 24B are provided.

  The top plate 22 is bent downward on the base end side of the top plate body and the top plate main body welded to the upper portions of the side plates 21 and 21 while being placed on the upper end surfaces of the side plates 21 and 21. Each side plate 21 has a closing portion 22a that closes the upper portion of the base end opening portion.

  The bottom plate 23 is bent upward at the base end side of the bottom plate body and is welded to the lower portion of the side plates 21 and 21 in a state where the side plates 21 and 21 are placed. And a closing portion 23a for closing the lower portion of the proximal end opening. The end face of the closing part 23a and the end face of the closing part 22a are abutted against each other at the base end parts of the side plates 21 and 21. Therefore, the closing portion 22a and the closing portion 23a function as a lid that closes the opening on the base end side of each of the side plates 21 and 21. In the present embodiment, the side plates 21, 21, the top plate 22, and the bottom plate 23 constitute a first connected body.

  The attachment portions 24A and 24B are provided so as to protrude from the blocking portions 22a and 23a toward the proximal end side. Each attachment part 24A, 24B is arranged at intervals in the left-right direction. In the present embodiment, the attachment portion 24A constitutes a first right attachment portion, and the attachment portion 24B constitutes a first left attachment portion.

  The mounting portion 24A includes a pair of mounting plates 24a and 24b that are opposed to each other in the left-right direction with a space for disposing the right side plate 18 therebetween. The mounting plate 24a is provided with an upper pin hole 24c and a lower pin hole 24e. The upper pin hole 24c and the lower pin hole 24e are holes that penetrate the mounting plate 24a in the left-right direction, respectively. Further, the distance between the upper pin hole 24c and the lower pin hole 24e matches the distance between the upper pin hole 18b and the lower pin hole 18c. Similarly, the mounting plate 24b is provided with an upper pin hole 24d and a lower pin hole 24f. The upper pin hole 24d and the lower pin hole 24f are holes that penetrate the mounting plate 24b in the left-right direction, respectively. Further, the distance between the upper pin hole 24d and the lower pin hole 24f matches the distance between the upper pin hole 18b and the lower pin hole 18c. Furthermore, the upper pin hole 24d and the upper pin hole 24c are provided at positions that overlap each other when viewed from the side. Similarly, the lower pin hole 24f and the lower pin hole 24e are provided at positions overlapping each other when viewed from the side.

  The mounting portion 24B includes a right mounting portion 24A and a portion that is bilaterally symmetric, and a right mounting portion 24A that is not bilaterally symmetric. Therefore, a portion of the mounting portion 24B that is not symmetrical with the mounting portion 24A will be described.

  Specifically, the mounting plate 24a of the left mounting portion 24B is provided with an upper insertion hole 24g and a lower insertion hole 24i (see FIG. 3) for inserting an operation member 29b described later. The upper insertion hole 24g and the lower insertion hole 24i are holes that penetrate the mounting plate 24a in the left-right direction, respectively. Similarly, an upper insertion hole 24h and a lower insertion hole 24j (see FIG. 3) for inserting an operation member 29b described later are provided in the mounting plate 24b of the left mounting portion 24B. The upper insertion hole 24h and the lower insertion hole 24j are holes that penetrate the mounting plate 24b in the left-right direction. Further, the upper insertion hole 24h and the upper insertion hole 24g are provided at positions overlapping each other when viewed from the side. Similarly, the lower insertion hole 24j and the lower insertion hole 24i are provided at positions that overlap each other when viewed from the side.

  And the work attachment 4 which concerns on this embodiment is further provided with the next structure provided in the 1st addition boom 8. FIG. Specifically, the work attachment 4 may be collectively referred to as upper connection pins 25A and 25B and lower connection pins 26A and 26B (hereinafter referred to as connection pins 25A to 26B) for connecting the main boom 7 and the first additional boom 8. An upper holding mechanism 27A for holding the upper connecting pins 25A, 25B, a lower holding mechanism 27B for holding the lower connecting pins 26A, 26B, an upper operating mechanism 29A for operating the upper holding mechanism 27A, and a lower A lower operation mechanism 29B for operating the holding mechanism 27B and a movement restricting member 28 (see FIGS. 5 and 6) for restricting the movement of the connecting pins 25A to 26B are further provided.

  The connection pins 25 </ b> A to 26 </ b> B are for connecting the main boom 7 and the first extension boom 8, respectively. Specifically, the connecting pin 25A connects the mounting portion 24A and the right mounting portion 18a by penetrating the mounting portion 24A and the right mounting portion 18a in the left-right direction through the upper pin holes 18b, 24c, and 24d. The connecting pin 25B connects the mounting portion 24B and the left mounting portion 18a by penetrating the mounting portion 24B and the left mounting portion 18a in the left-right direction through the upper pin holes 18b, 24c, and 24d. Similarly, the connecting pins 26A and 26B penetrate the mounting portions 24A and 24B and the mounting portions 18a in the left-right direction through the lower pin holes 18c, 24e and 24f, respectively, thereby connecting the mounting portions 24A and 24B and the mounting portions 18a. Link.

  The upper holding mechanism 27A includes an inserted state in which the connecting pin 25A is inserted into the upper pin holes 18b, 24c, and 24d, and an extracted state in which the connecting pin 25A is pulled out from the pin hole 18b to the left between the mounting portions 24A and 24B. The connecting pin 25A is movably held between the two. The upper holding mechanism 27A includes an insertion state in which the connecting pin 25B is inserted into the upper pin holes 18b, 24c, and 24d, and an extraction in which the connecting pin 25B is pulled out from the pin hole 18b to the right side between the mounting portions 24A and 24B. The connection pin 25B is held movably between the states. That is, the upper holding mechanism 27A according to the present embodiment constitutes an example of the right holding mechanism and the left holding mechanism. In addition, since the upper holding mechanism 27A and the lower holding mechanism 27B have a configuration of a vertical object, only the upper holding mechanism 27A will be described, and the description of the lower holding mechanism will be omitted.

  The upper holding mechanism 27A includes a support member 27a spanned between the mounting portions 24A and 24B, a right link member 27c that connects the support member 27a and the connection pin 25A, and a support member 27a and the connection pin 25B. The left link member 27b to be connected and the shafts J1 to J4 that rotatably support the link members 27b and 27c and the support member 27a are provided. The right link member 27c rotates around the axis J4 (fourth axis) and rotates around the axis J3 (fifth axis) and the upper end (fourth end) pivotally supported by the left end of the connecting pin 25A. It has a lower end (fifth end) pivotally supported by the support member 27a in a possible state. The left link member 27b has an upper end portion (first end) pivotally supported by the right end portion of the connection pin 25B in a state of being rotatable around the axis J2 (first axis), and a lower end portion connected to an operation member to be described later. (Second end). The left link member 27b is pivotally supported by the support member 27a so as to be rotatable around the axis J1 (third axis) at a position between the upper end portion and the lower end portion. The axes J1 to J4 are axes parallel to each other having axes perpendicular to the blocking portions 22a and 23a.

  The upper operation mechanism 29A can switch the upper holding mechanism 27A between an insertion state and an extraction state. Similarly, the lower operation mechanism 29B can switch the lower holding mechanism 27B between an insertion state and an extraction state. In addition, since the upper operation mechanism 29A and the lower operation mechanism 29B have a configuration of a vertical object, only the upper operation mechanism 29A will be described, and the description of the lower operation mechanism 29B will be omitted.

  The upper operating mechanism 29A includes a connecting member 29a that connects the right link member 27c and the left link member 27b, an operating member 29b that receives an operation for switching the upper holding mechanism 27A, the connecting member 29a, and the link members 27b and 27c. And a shaft J7 (second shaft) that pivotally supports the lower end portion of the operation member 29b and the left link member 27b. The operating member 29b is provided at the left end portion of the through portion 29c and the through portion 29c that slidably penetrates the mounting portion 24B through the upper insertion holes 24g and 24h (see FIG. 3) of the left mounting portion 24B. And a regulating portion 29d that regulates the pushing operation of the penetrating portion 29c to the right side by abutting against the left side surface (mounting portion outer side surface) of the mounting plate 24b. The through portion 29c has a right end portion pivotally supported on the lower end portion of the left link member 27b in a state of being rotatable around the axis J7. The through portion 29c has a length that allows the holding mechanisms 27A and 27B to be switched to the insertion position in a state where the movement is restricted by the restricting portion 29d. The restricting portion 29d is located on the inner side of the left side surface (main body outer surface) of the left side plate 21 of the first extension boom 8 in a state where the operation member 29b is pushed in. Specifically, as shown in FIG. 4, the restricting portion 29d has a thickness dimension D2 smaller than a distance D1 between the left side surface of the side plate 21 and the left side surface of the mounting plate 24b. The connecting member 29a is provided between a lower end portion pivotally supported by the left link member 27b in a state of being rotatable around an axis J5 provided at a position between the axis J1 and the axis J7, and between the axis J3 and the axis J4. And an upper end portion pivotally supported by the right link member 27c so as to be rotatable around an axis J6. The axes J5 to J7 are axes that are parallel to each other and each have an axis perpendicular to the blocking portions 22a and 23a.

  When the operation member 29b is pushed in from the left side to the right side (from the outside to the inside of the first boom 8) with respect to the mounting portion 24B, as shown in FIG. 4, the upper ends of the link members 27b and 27c are mutually connected. Opening, each connecting pin 25A, 25B is inserted into each upper pin hole 24c, 24d. In this state, the front end surfaces of the connecting pins 25A and 25B are arranged flush with or slightly outside the outer surfaces of the mounting plates 24b and 24b. In this state, for example, when the connecting pin 25A is pushed from the left side to the right side (for example, struck with a hammer or the like), the lower end portion of the left link member 27b rotates to the left side, and the operation member 29b protrudes to the left side. As the lower end portion of the left link member 27b rotates to the left side, the upper end portion of the right link member 27c connected to the left link member 27b via the connecting member 29a rotates to the left side. As a result, the right connecting pin 26A moves to the left. When the connecting pin 25A is further pushed in, both the connecting pins 25A and 25B move to a position where they are pulled out from the mounting portion 18a of the main boom 7 as shown in the lower holding mechanism 27B of FIG. Specifically, the distal end surfaces of both the connecting pins 25A and 25B in this extracted state are located within the thickness range of the mounting plate 24a. As described above, in the extracted state, the connecting pins 25A and 25B are positioned within the thickness range of the mounting plate 24a, so that the connecting pins 25A and 25B are moved to the upper portions when the operating member 29b is next pushed. The pin holes 24c and 24d can be prevented from coming off.

  As shown in FIGS. 5 and 6, the movement restricting member 28 can be attached to and detached from the connecting pins 25 </ b> A to 26 </ b> B in the inserted state, and restricts the pushing operation of the connecting pins 25 </ b> A to 26 </ b> B. Specifically, the movement restricting member 28 includes a disc-shaped restricting plate 28a and a bolt 28b for attaching the restricting plate 28a to the front end surfaces of the connecting pins 25A to 26B. The bolt 28b can be screwed into a female screw portion formed along the axis of each of the connecting pins 25A to 26B. An insertion hole for inserting the bolt 28b is formed at the center position of the restriction plate 28a. Further, the regulation plate 28a has a diameter dimension larger than the diameter dimension of each of the connecting pins 25A to 26B. For this reason, in a state where the regulation plate 28a is attached to the front end surfaces of the connection pins 25A to 26B, the regulation plate 28a and the outer surface of the attachment plate 24b come into contact with each other, so that the connection pins 25A to 26B are pushed. Movement is restricted.

  In the present embodiment, the movement restricting members 28 are attached to all the connecting pins 25A to 26B, but the number of the movement restricting members 28 can also be reduced. Specifically, it is sufficient to attach the movement restricting member 28 to one of the connecting pins 25A to 26B that is linked to each other. In the present embodiment, one movement restricting member 28 may be attached to the connecting pin 25A or the connecting pin 25B, and one movement restricting member 28 may be attached to the connecting pin 26A or the connecting pin 26B. Moreover, you may provide the movement control member which controls the movement with respect to the operation member 29b linked with connection pin 25A-26B.

  Hereinafter, a connection procedure between the main boom 7 and the first extension boom 8 will be described. The procedure from the state in which the main boom 7 is attached to the revolving frame 5 and the boom cylinder 14 is provided between the main boom 7 and the revolving frame 5 will be described.

  First, as shown in FIG. 2, the first extension boom 8 is held so that it is at the same height as the main boom 7 and at the front end side of the main boom 7. Although FIG. 2 discloses an example in which the first extension boom 8 is held using the gantry C <b> 1 to C <b> 3, the first extension boom 8 can be held by being suspended by a crane outside the figure. In this state, the upper holding mechanism 27A and the lower holding mechanism 27B of the first additional boom 8 are each switched to the extracted state as shown in the lower holding mechanism 27B of FIG.

  Next, by moving the main boom 7 or the first extension boom 8, as shown in FIGS. 5 and 6, the attachment portions 18 a of the main boom 7 are respectively attached to the attachment plates 24 a and the attachment plates of the first extension boom 8. 24b. In this state, the upper boom holes 18b, 24c, and 24d overlap each other when viewed from the side, and the lower boom holes 18c, 24e, and 24f overlap each other when viewed from the side. And positioning. Here, in the 1st extension boom 8 which concerns on this embodiment, in the extraction state, each connection pin 25A-26B has moved inside from each pin hole 24c-24f. Therefore, it can be easily confirmed from the side whether each pin hole 18b, 18c, 24c-24f has overlapped.

  When it is confirmed that the pin holes 18b, 18c, and 24c to 24f are overlapped, the operation members 29b are pushed in. Thereby, the upper holding mechanism 27A and the lower holding mechanism 27B are respectively switched to the inserted state as shown in FIG. That is, each connection pin 25A-26B is inserted in each pin hole 18b, 18c, 24c-24f, respectively. Thereby, the main boom 7 and the 1st extension boom 8 are connected.

  Next, the movement restricting member 28 is attached to each of the connecting pins 25A to 26B. Thereby, since the movement of each connecting pin 25A-26B is controlled, each holding mechanism 27A, 27B is hold | maintained in an insertion state.

  On the other hand, when the main boom 7 and the first extension boom 8 are divided, first, the respective movement restricting members 28 are removed from the respective connecting pins 25A to 26B.

  Next, the connecting pin 25A or the connecting pin 25B is pushed in from the left side to the right side. As a result, the upper holding mechanism 27A is switched from the insertion state to the extraction state, and the connection pins 25A and 25B are pulled out from the upper pin holes 18b of the attachment portions 18a. Similarly, the connecting pin 26A or the connecting pin 26B is pushed from the left side to the right side. As a result, the lower holding mechanism 27B is switched from the insertion position to the extracted state, and the connecting pins 26A and 26B come out of the lower pin holes 18c of the mounting portions 18a. In this state, the main boom 7 and the first extension boom 8 can be divided.

  As described above, in the embodiment, the holding mechanisms 27A and 27B have the operation mechanisms 29A and 29B that can be switched between the insertion state and the extraction state. Therefore, each connection pin 25A-26B can be extracted inside from each pin hole 18b, 18c by making each holding mechanism 27A, 27B into an extraction state using operation mechanism 29A, 29B. Therefore, according to the present invention, the connecting pins 25A to 26B can be extracted inside without requiring a hydraulic cylinder and a hydraulic pipe connected thereto as in the prior art.

  In particular, in the above-described embodiment, the first extension boom 8 is connected to the holding mechanisms 27A and 27B so as to protrude to the left side (outside) of the first extension boom 8 while being switched to the extracted state. An operation member 29b that can switch the holding mechanisms 27A and 27B from the extracted state to the inserted state by being pushed in from the outside to the inside is provided. Therefore, the operator who performs the connection work of the first extension boom 8 and the main boom 7 can easily use the operation member 29b protruding outside the first extension boom 8 as an insertion point for inserting the connection pins 25A to 26B. It can be recognized and, after the first extension boom 8 and the main boom 7 are connected, the operation member 29b is pushed into the first addition boom 8 so that the operation member 29b protrudes from the first addition boom 8. By reducing the height, a compact form can be realized.

  In the embodiment, the left and right connecting pins 25A and 25B or the left and right connecting pins 26A and 26B can be switched by one connecting member 29b by the connecting member 29a. Accordingly, the left and right connecting pins 25A and 25B or the left and right connecting pins 26A and 26B can be inserted into the pin holes 18b, 18c and 24c to 24f by an operation from the left side of the first extension boom 8. . Therefore, workability can be improved compared to the case where the connecting pins 25A to 26B are inserted from the left and right positions of the first extension boom 8.

  In the above-described embodiment, the connecting members 25A to 26B in the inserted state are pushed inward from the outside of the boom 8 by the link members 27b and 27c, and the operating member 29b is added to the inside of the boom 8 and protrudes to the outside of the boom 8. Can be made. That is, the holding mechanisms 27A and 27B can be switched to the extracted state by pushing the connecting pins 25A to 26B from the outside to the inside of the first addition boom 8. Therefore, the holding mechanisms 27A and 27B can be switched between the extracted state and the inserted state only by pressing the operating member 29b or the connecting pins 25A to 26B.

  Therefore, according to the said embodiment, since the tension | pulling operation which is hard to transmit force can be abbreviate | omitted, workability | operativity can be improved. Further, since the pulling operation can be omitted, it becomes unnecessary to form a handle portion for pulling on the operation member 29b, and a more compact form can be realized.

  In the embodiment, the link pin 27B and the operation member 29b can be moved in opposite directions by the link member 27b rotating around the axis J1 with respect to the first additional boom 8. That is, by rotating the link member 27b in one direction, the connecting pin 25B is moved to the outside (left side) of the boom 8 and the operation member 29b is moved to the inside (right side) of the boom by adding the first addition. Can be made. On the other hand, by rotating the link member 27b in the opposite direction, the connecting pin 25B can be moved to the inside of the boom 8 by the first addition, and the operation member 29b can be moved to the outside of the boom 8 by the first addition. Therefore, one of the operation member 29 b and the connecting pin 25 </ b> B is first added and pushed inward from the outside of the boom 8, and the other can be extended to the outside of the boom 8 by adding the first.

  In the embodiment, the right link member 27c and the left link member 27b are provided. Therefore, both connecting pins 25A and 25B can be inserted into and removed from the respective pin holes 18b, 24c and 24d in accordance with the rotation of both link members 27b and 27c. Furthermore, in the above-described embodiment, the link members 27b and 27c are arranged such that at least one of the connecting pins 25A and 25B is pushed in the inserted state so that the operation member 29b is first added and protrudes to the left side (outside) of the boom 8. It is connected by a connecting member 29a. Therefore, the upper holding mechanism 27A can be switched to the insertion state by pushing the operating member 29b from the left side to the right side (inside) of the boom 8 while at least one of the connecting pins 25A and 25B is added to the first boom 8. The operation member 29b can be extended to the outside of the boom 8 by pushing it inward from the outside.

  In the embodiment, the movement of the connecting pins 25 </ b> A to 26 </ b> B can be restricted by the movement restricting member 28. Therefore, it is possible to prevent the connecting pins 25A to 26B from moving unintentionally and switching the holding mechanisms 27A and 27B.

  In the embodiment, the restricting portion 29d of the operation member 29b has a thickness dimension D2 smaller than the distance D1 between the left side surface of the side plate 21 and the left side surface of the mounting plate 24b, as shown in FIG. Accordingly, the restricting portion 29d can be accommodated inside (on the right side) of the left side surface of the side plate 21 in a state where the operation member 29b is pushed to the position restricted by the restricting portion 29d. Therefore, a more compact form can be realized in a state where the operation member 29b is pushed, that is, in a state where the holding mechanisms 27A and 27B are switched to the insertion state.

  In the embodiment described above, the pushing operation of the penetrating portion 29c is restricted at the position where each holding mechanism 27A, 27B is switched to the inserted state. Therefore, the holding mechanisms 27A and 27B can be automatically switched to the insertion state by pushing the penetration part 29c to the position regulated by the regulation part 29d without being aware of the insertion depth of the penetration part 29c.

  In the above-described embodiment, the two holding mechanisms 27A and 27B are operated separately, but a connecting member for interlocking these holding mechanisms 27A and 27B may be provided. If it does in this way, each connection pin 25A-26B can be inserted in pin hole 18b, 18c of each attaching part 18a by pushing operation of the one operation member 29b. Further, by pushing one of the connecting pins 25A to 25B in the inserted state, all of the connecting pins 25A to 25B can be extracted from the pin holes 18b and 18c.

  In the above-described embodiment, each of the operation mechanisms 29A and 29B can switch between two of the connection pins 25A to 26B. However, an operation mechanism for operating each of the connection pins 25A to 26B may be provided. it can. Specifically, the connecting member 29a can be omitted, and an operating member 29b connected to each link 27c can be separately provided.

D1 interval (distance between the outer surface of the mounting part and the outer surface of the main unit)
D2 Thickness dimension of penetrating part 1 Work machine 2 Lower traveling body (example of base machine)
3 Upper swing body (example of base machine)
4 work attachments 7 main boom (an example of a 1st connection body and a 2nd connection body)
8 First extension boom (an example of a first connection body and a second connection body)
9 Second extension boom (an example of a first connection body and a second connection body)
10 Front boom (an example of a first connector)
18a Mounting part (an example of a second right side mounting part and a second right side mounting part)
18b Upper pin hole (example of second right hole and second left hole)
18c Lower pin hole (example of second right hole and second left hole)
24A, 24B mounting part (an example of the first right side mounting part and the first left side mounting part)
24c, 24d Upper pin hole (an example of a first right hole and a first left hole)
24e, 24f Lower pin hole (example of first right hole and first left hole)
25A, 25B Upper connection pin (an example of right and left connection pins)
26A, 26B Lower connection pin (an example of a right connection pin and a left connection pin)
27A Upper holding mechanism (an example of a holding mechanism)
27B Lower holding mechanism (an example of a holding mechanism)
27b Left link member 27c Right link member 28 Movement restricting member 29A Upper operation mechanism (an example of operation member)
29B Lower operation mechanism (example of operation member)
29a connecting member 29b operating member 29c penetrating portion 29d regulating portion

Claims (9)

A work attachment that can be undulated and attached to a base machine of a work machine,
A first linking body having a first linking body, and a first right side mounting portion and a first left side mounting portion protruding from the first linking body body;
A second linking body having a second linking body main body, and a second right side mounting portion and a second left side mounting portion protruding from the second linking body main body;
By penetrating the first right attachment portion and the second right attachment portion in the left-right direction through the first right hole formed in the first right attachment portion and the second right hole formed in the second right attachment portion, A right connecting pin capable of connecting the first right mounting portion and the second right mounting portion;
By penetrating the first left side mounting part and the second left side mounting part in the left-right direction through the first left side hole formed in the first left side mounting part and the second left side hole formed in the second left side mounting part, A left connecting pin capable of connecting the first left mounting portion and the second left mounting portion;
An insertion state in which the right connection pin is inserted into the first right hole and the second right hole; and the right connection pin is connected to the first right attachment portion and the first left attachment. A right side holding mechanism that holds the right side connection pin movably between a part and a pulled out state that is pulled out to the left side from the second right side hole;
An insertion state in which the left connection pin is inserted into the first left hole and the second left hole; and the left connection pin is connected to the first right attachment portion and the first left attachment. A left-side holding mechanism that holds the left-side connecting pin movably between the second left-side hole and the pulled-out state with respect to the portion,
An operating mechanism provided on the first coupling body, wherein the right side holding mechanism and the left side holding mechanism can be switched between the insertion state and the extraction state;
The operating mechanism is connected to at least one of the right holding mechanism and the left holding mechanism so as to protrude to the outside of the first connecting body in a state of being switched to the extracted state, and the first connecting body A work attachment having an operation member capable of switching at least one of the right side holding mechanism and the left side holding mechanism from the extracted state to the inserted state by being pushed inward from the outside.   The operation mechanism is configured so that the right holding mechanism and the left holding mechanism can be switched from the extracted state to the inserted state by the operation member being pushed inward from the outside of the first coupling body. The work attachment according to claim 1, further comprising a connecting member that connects the right holding mechanism and the left holding mechanism.   Of the right side holding mechanism and the left side holding mechanism, the holding mechanism to which the operating member is connected is configured such that the connecting pin held by the operating member is pushed inwardly from the outside of the first connecting body in the inserted state. The work attachment according to claim 1, further comprising: a link member that connects the connection pin and the operation member so that the connection pin protrudes to the outside of the first connection body.   The link member is connected to the operation member in a state of being rotatable about a first axis connected to the connecting pin in a state of being rotatable about a first axis and a second axis parallel to the first axis. A second end connected to the first end and the second end in a state of being rotatable about a third axis parallel to the first axis and the second axis at a position between the first end and the second end. The work attachment according to claim 3, wherein the work attachment is pivotally supported by the first coupling body. The right holding mechanism has a right link member that connects the right connecting pin and the first connecting body,
The left holding mechanism has a left link member that connects the left connecting pin and the first connecting body,
One of the right link member and the left link member has a first end connected to the connection pin in a state of being rotatable about a first axis, and a second axis rotation parallel to the first axis. And a third axis parallel to the first axis and the second axis at a position between the first end and the second end. Pivotally supported by the first connecting body in a state of being rotatable around,
The other of the right link member and the left link member has a fourth end connected to the connecting pin in a state of being rotatable about a fourth axis parallel to the first to third axes, A fifth end pivotally supported by the first connecting body in a state of being rotatable about a fifth axis parallel to the first to fourth axes;
In the inserted state, the connecting member causes the operating member to protrude outward from the first connecting body when at least one of the right connecting pin and the left connecting pin is pushed inward from the outside of the first connecting body. The work attachment according to claim 2, wherein the right link member and the left link member are connected to each other.   The apparatus further comprises a connection pin that is detachable from the first connecting body and that is connected to the operating member, and a movement restricting member that restricts movement of at least one of the operating members relative to the first connecting body. Item 6. The work attachment according to any one of Items 3 to 5. The operating member is provided at a penetrating portion that slidably penetrates the first right-side mounting portion or the first left-side mounting portion in the left-right direction, and at the end of the penetrating portion, and the penetrating portion penetrates the operating member. A regulation part that regulates the pushing operation of the penetrating part by abutting on the outer side surface of the first right side mounting part or the second right side mounting part.
The mounting portion outer surface is disposed inside a main body outer surface which is an outer surface of the first connected body,
The work attachment according to any one of claims 3 to 6, wherein the restricting portion has a thickness dimension smaller than a distance between the outer surface of the attachment portion and the outer surface of the main body.   The operation member is switched to the insertion state when at least one of the first right side mounting portion or the first left side mounting portion slidably penetrating through the left side direction, the right side holding mechanism, and the left side holding mechanism. The work attachment according to any one of claims 1 to 6, further comprising: a restricting portion that restricts a pushing operation of the penetrating portion from the outside to the inside of the first connecting body at the position where the first connecting body is placed. A base machine,
A work machine comprising the work attachment according to any one of claims 1 to 8, which is attached to the mars machine so as to be raised and lowered.

Images