JP7119964B2 - Coupling pin attachment/detachment jig and coupling pin attachment/detachment method - Google Patents

Description

The present invention relates to a coupling pin attachment/detachment jig and a coupling pin attachment/detachment method.

For example, the connection between the slewing frame of the superstructure of a large crane and the boom, or the connection between the components of a crane attachment, has coupling holes formed in the overlapping portions of these members so that these members can be connected in a separable manner. A connection structure in which a coupling pin is inserted into the joint is widely adopted.

In general, for connection between these members, a first connector having a pair of first plate-shaped portions opposed to each other with a space therebetween and having coaxial first pin holes formed thereon, and the pair of first plate-shaped portions A second connector is used, which has a second plate-like portion formed with a second pin hole inserted therebetween and arranged coaxially with the first pin hole. The connection between the first connector and the second connector is performed by inserting coupling pins into a pair of first and second pin holes arranged coaxially.

As a connection structure between the first connector and the second connector, for example, a connecting pin (insertion pin) to be inserted into a pair of first pin hole and second pin hole, and a hydraulic cylinder for retracting the connecting pin. A structure using a connecting pin having a spring that biases the connecting pin in the protruding direction has been proposed (see Japanese Patent Application Laid-Open No. 2012-41148).

The connecting pin described in the above publication is constructed such that the connecting pin can be retracted by expansion and contraction of the hydraulic cylinder. configured to be maintainable within the bore;

JP 2012-41148 A

The connecting pin described in the above publication uses hydraulic power and requires a hydraulic cylinder for inserting and withdrawing the connecting pin. Therefore, this connecting pin is heavy and difficult to handle manually. In addition, this connecting pin requires a power source such as a hydraulic tank and a pump, which increases manufacturing costs.

In view of the above inconvenience, it is an object of the present invention to provide a coupling pin attachment/detachment jig and a coupling pin attachment/detachment method capable of easily inserting and removing a coupling pin at low cost.

A coupling pin attachment/detachment jig according to the present invention, which has been made to solve the above-described problems, has a pair of first plate-shaped portions facing each other with a space therebetween, and a first plate-shaped portion coaxial with the pair of first plate-shaped portions. A pin hole is formed, one of the first plate-shaped portions is formed with an annular protrusion projecting outward in the opposite direction from the peripheral edge of the first pin hole, and a first locking hole is formed in the radial direction of the protrusion. A second connector having a first connector formed thereon and a second plate-like portion formed with a second pin hole inserted between the pair of first plate-like portions and arranged coaxially with the first pin hole. A coupling pin attachment/detachment jig capable of inserting and withdrawing a coupling pin into the pair of first and second pin holes in order to attach and detach the coupling pin, the coupling pin attachment/detachment jig configured to be externally fitted to the protrusion, and penetrating in the radial direction. an annular fixing portion having a second locking hole, an engaging member engageable with the first locking hole and the second locking hole, and a pair of the first pin hole and the second pin hole coaxially. A screw hole is formed through the fixing part and a holding part arranged at an interval in the axial direction of the fixing part, and below the pair of first pin hole and second pin hole A support portion for connecting the fixing portion and the holding portion and capable of supporting the coupling pin from below during insertion and removal, and a push bolt screwed into the screw hole are provided.

The coupling pin attachment/detachment jig has a ring-shaped fixing portion fitted onto a ring-shaped protrusion provided on the first plate-shaped portion of the first connector, and a first locking hole formed in the protrusion and the fixing portion. By engaging the engaging member with the second locking hole formed in the connector, the connector can be attached to the first connector. In the connecting pin attachment/detachment jig, a push bolt is screwed into a threaded hole formed in a holding portion spaced apart from the fixing portion, and the push bolt is rotated in a screwing direction to remove the connection pin. It can be inserted into a pair of first and second pin holes. Further, the coupling pin attachment/detachment jig can extract the coupling pin from the pair of first pin hole and second pin hole by rotating the push bolt in the unscrewing direction. In other words, the connecting pin attachment/detachment jig makes it possible to insert and remove a single connecting pin by screwing and unscrewing the push bolt without using hydraulic power. Therefore, the coupling pin attachment/detachment jig can easily insert and remove the coupling pin at low cost.

The fixing portion is formed with an engaging projection that protrudes radially inward from the inner peripheral surface thereof, and the engaging projection is a cut formed from the distal end side toward the proximal end side in the projecting direction of the projecting portion. It is good to be comprised so that engagement with a notch is possible. In this manner, the fixing portion is formed with an engaging projection that protrudes radially inward from the inner peripheral surface of the fixing portion. By being configured to be engageable with the formed notch, the fixing portion can be reliably fixed to the protrusion.

It is preferable that the second locking hole and the engaging projection are arranged at radially opposite positions of the fixing portion. In this manner, the second locking hole and the engaging projection are arranged at radially opposing positions of the fixing portion, so that the fixing portion of the fixing portion can be more securely fixed to the projecting portion.

It is preferable that the support portion has a gutter shape extending in the insertion/removal direction of the coupling pin. In this manner, since the support portion has a gutter shape extending in the insertion/removal direction of the connection pin, the connection pin can be guided by the support portion when the connection pin is inserted/removed.

It is preferable that the inner peripheral edge of the support portion is located closer to the center than the inner peripheral edge of the fixing portion. In this way, by positioning the inner peripheral edge of the support portion closer to the center than the inner peripheral edge of the fixing portion, the peripheral edges of the pair of first and second pin holes and the inner peripheral edge of the support portion The step between them can be made small, and the coupling pin can be easily and reliably guided by the support portion.

The coupling pin attachment/detachment jig may further include a pressing member that is screwed onto the front end side of the push bolt and integrates the push bolt with the coupling pin. In this way, by further providing a pressing member that is screwed onto the distal end side of the push bolt and integrates the push bolt with the coupling pin, the rotation of the coupling pin about the axis of the push bolt is prevented. The coupling pin can be easily and reliably inserted and removed.

In addition, a coupling pin attaching/detaching method according to the present invention, which has been made to solve the above problems, includes the steps of engaging the fixing portion of the coupling pin attaching/detaching jig with the projecting portion of the first connector, and using an impact wrench. inserting and extracting the coupling pin into the pair of first and second pin holes by screwing or unscrewing the push bolt.

The coupling pin attachment/detachment method uses the coupling pin attachment/detachment jig having the above configuration, so that the coupling pin can be easily inserted and removed at low cost.

In the present invention, "lower" means "lower" in a state where the connecting pin attachment/detachment jig is attached to the projecting portion of the first connector. “Gutter shape” means a partial cylindrical shape obtained by notching a part of the circumferential direction along the axial direction.

The coupling pin attaching/detaching jig and coupling pin attaching/detaching method according to the present invention can easily insert and remove the coupling pin at low cost.

1 is a schematic perspective view of a coupling pin attachment/detachment jig according to an embodiment of the present invention, viewed from diagonally above; FIG. FIG. 2 is a schematic diagram showing an example of a connection structure connected by a coupling pin using the coupling pin attachment/detachment jig of FIG. 1 ; FIG. 3 is a schematic enlarged perspective view showing a connection portion of the connection structure of FIG. 2; FIG. 2 is a schematic perspective view of the main body of the coupling pin attaching/detaching jig of FIG. 1 as seen from the diagonally lower side thereof; 3. It is a schematic perspective view which shows the state which attached the connecting pin attachment/detachment jig|tool of FIG. 1 to the connection part of FIG. FIG. 6 is a schematic perspective view showing a state in which a coupling pin is extracted from the connecting portion of FIG. 5 using the coupling pin attaching/detaching jig of FIG. 1;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Coupling pin attaching/detaching jig]
FIG. 1 shows a coupling pin attachment/detachment jig 1 according to one embodiment of the present invention.

2 and 3 show a boom 21 and a revolving frame 22 ( 1 shows a connection structure with a revolving frame provided on an upper revolving structure. In addition, connection structures other than those described above include, for example, a connection structure between a boom and a jib of a tower crane.

2 and 3, a first connector 21a is formed at the end of the boom 21 connected to the revolving frame 22, and a second connector 22a is formed at the connecting portion of the revolving frame 22 to the boom 21. is formed. The first connector 21 a and the second connector 22 a are detachably connected by the coupling pin 3 .

The first connector 21a has a pair of first plate-like portions 31a and 31b facing each other with a space therebetween. A pair of first plate-like portions 31a and 31b are formed with coaxial first pin holes H, and one of the first plate-like portions 31a has an annular protrusion that protrudes outward in the opposite direction from the periphery of the first pin hole H. A portion 32 is formed. The projecting portion 32 is, for example, cylindrical. A first locking hole 32a is formed in the radial direction of the projecting portion 32 . A notch 32b is formed in the projecting portion 32 from the distal end side toward the proximal end side in the projecting direction. The first locking hole 32a and the notch 32b are formed at positions facing each other in the radial direction of the projecting portion 32. As shown in FIG.

The second connector 22a is inserted between the pair of first plate-like portions 31a and 31b of the first connector 21a, and is provided with a second pin hole (not shown) arranged coaxially with the first pin hole H. It has two plate-shaped parts 33 .

A coupling pin 3 is inserted into the pair of first pin hole H and second pin hole. The coupling pin 3 has a shaft portion 3a that is inserted into a pair of first pin hole H and second pin hole. An insertion/extraction screw hole 3b that can be screwed with the part is formed. Both ends of a fixing pin P passing through the connecting pin 3 in the radial direction are locked in the first locking hole 32a and the notch 32b of the first connector 21a, so that the connecting pin 3 can be prevented from falling off from the connection structure. is prevented.

The coupling pin attachment/detachment jig 1 is configured such that the coupling pin 3 can be inserted into and removed from a pair of the first pin hole H and the second pin hole. As shown in FIGS. 1 and 4, the coupling pin attachment/detachment jig 1 includes an annular fixing portion 11 configured to be externally fitted to the projecting portion 32 and having a second locking hole 11b penetrating in the radial direction; An engaging member 12 that can be engaged with the first locking hole 32a and the second locking hole 11b and a screw hole 13a that can be coaxial with the pair of the first pin hole H and the second pin hole are formed to penetrate, The fixing part 11 and the holding part 13 arranged with a gap in the axial direction of the fixing part 11, and the fixing part 11 and the holding part 13 are connected below the pair of the first pin hole H and the second pin hole. In addition, a support portion 14 capable of supporting the coupling pin 3 from below during insertion and removal, and a push bolt 15 screwed into the screw hole 13a are provided. Further, the coupling pin attachment/detachment jig 1 includes a pressing member 16 that is screwed onto the distal end side of the push bolt 15 and integrates the push bolt 15 with the coupling pin 3 . The fixing portion 11 , the holding portion 13 and the supporting portion 14 are integrally formed (that is, formed as one member) and constitute the main body 2 of the coupling pin attachment/detachment jig 1 . The body 2 is mainly composed of metal, for example. Examples of this metal include stainless steel and steel. In addition, a "main component" means a component with the largest content in terms of mass. Since the main body 2 of the coupling pin attachment/detachment jig 1 is composed of the fixing portion 11, the holding portion 13, and the support portion 14, it can be easily reduced in weight and manufactured at a relatively low cost.

The coupling pin attachment/detachment jig 1 is attached to the projecting portion 32 in a state in which the fixing pin P is extracted from the first locking hole 32a and the notch 32b of the first connector 21a. The coupling pin attachment/detachment jig 1 is attached to the projecting portion 32 by fitting the fixing portion 11 onto the projecting portion 32, as shown in FIG.

(Fixed part)
The fixing portion 11 has an annular engaging portion 11a that can be fitted onto the projecting portion 32 . The inner peripheral surface of the engaging portion 11 a has a shape corresponding to the outer peripheral surface of the projecting portion 32 . In this embodiment, the engaging portion 11a is cylindrical. The second locking hole 11b penetrates the engaging portion 11a in its radial direction. Specifically, the second locking hole 11b extends vertically through the lower end of the engaging portion 11a. The second locking hole 11b is preferably a screw hole. The second locking hole 11b is formed at a position overlapping the first locking hole 32a when the fixing part 11 is fitted onto the projecting part 32 so as to communicate with the first locking hole 32a of the projecting part 32. .

The fixing portion 11 has an engaging protrusion 11c protruding radially inward from the inner peripheral surface of the engaging portion 11a. As shown in FIG. 5, the engagement protrusion 11c is configured to be engageable with a notch 32b formed from the distal end side of the projecting portion 32 toward the proximal end side thereof. The engaging projection 11c and the second locking hole 11b are arranged at radially opposite positions of the fixing portion 11 (more specifically, the engaging portion 11a). That is, in this embodiment, the engaging projection 11c is configured to project downward from the upper end portion of the inner peripheral surface of the engaging portion 11a. Note that "upper" means "upper" in a state where the joint pin attachment/detachment jig is attached to the projecting portion of the first connector.

The engaging protrusion 11c has a substantially rectangular parallelepiped shape whose longitudinal direction is parallel to the axial direction of the engaging portion 11a. The protrusion height of the engaging protrusion 11 c is equal to or less than the thickness of the protrusion 32 .

(engagement member)
The engaging member 12 fixes the fixing portion 11 to the projecting portion 32 by engaging with the first locking hole 32a and the second locking hole 11b. The engaging member 12 has a shaft portion that is inserted into the first locking hole 32a and the second locking hole 11b. When the second locking hole 11b is the screw hole described above, the engaging member 12 is preferably a bolt. According to this configuration, even when the second locking hole 11b is formed in the lower end portion of the engaging portion 11a, the engaging member 12 can be screwed into the second locking hole 11b by screwing the engaging member 12 into the engaging member. 12 can be easily and reliably prevented from coming off.

The coupling pin attaching/detaching jig 1 can fix the fixing portion 11 to the projecting portion 32 at one point by engaging the engaging member 12 . As a result, the coupling pin attachment/detachment jig 1 can restrict the movement of the fixing portion 11 in the circumferential direction and the axial direction. Further, the coupling pin attachment/detachment jig 1 is configured such that the engagement projection 11c is engaged with the notch 32b of the projecting portion 32 in addition to the engagement of the engagement member 12. As shown in FIG. As a result, the coupling pin attachment/detachment jig 1 uses the notch 32b provided for locking the fixing pin P to more reliably prevent the movement of the fixing portion 11, and the fixing portion is attached to the projecting portion. can be fixed securely.

In addition, the connecting pin attachment/detachment jig 1 is arranged such that the second locking hole 11b and the engaging projection 11c are arranged in positions facing the engaging portion 11a in the radial direction, particularly when the main body 2 falls off, the upper and lower sides of the jig 1 tend to serve as fulcrums and points of action. , so that the fixing portion 11 can be fixed to the protruding portion 32 more securely.

(Holding part)
The holding portion 13 is a plate member whose surface is perpendicular to the axial direction of the fixing portion 11, and has a screw hole 13a penetrating in the thickness direction. The threaded hole 13a is formed coaxially with the central axis of the fixing portion 11 so that the tip of the push bolt 15 can be screwed into the threaded hole 3b for inserting and withdrawing the coupling pin 3 while being screwed to the base end side of the push bolt 15. It is The holding portion 13 preferably has a sufficient thickness so that the screw holes 13a can be formed in the correct orientation.

(support part)
The support portion 14 has a gutter shape extending in the insertion/removal direction of the coupling pin 3 in a state where the main body 2 is attached to the projecting portion 32 . The longitudinal length of the support portion 14 is greater than the axial length of the coupling pin 3 so that the coupling pin 3 can be placed on its inner peripheral surface. The support portion 14 is configured such that the coupling pin 3 can be inserted into and removed from the pair of first pin hole H and second pin hole while sliding the coupling pin 3 in the longitudinal direction on the inner peripheral surface. The connecting pin attachment/detachment jig 1 can appropriately guide the connecting pin 3 in the longitudinal direction when the connecting pin 3 is inserted and removed because the support portion 14 has a gutter shape extending in the insertion/removal direction of the connection pin 3 .

As shown in FIG. 4 , the support portion 14 has a through hole 14 a for draining water at the end portion of the side connected to the holding portion 13 . The connecting pin attachment/detachment jig 1 tends to bend downward on the holding portion 13 side due to its own weight, the weight of the connecting pin 3, and the like in the state of use. In this respect, the coupling pin attachment/detachment jig 1 has a through hole 14a at the end of the side where the support portion 14 is connected to the holding portion 13, so that water accumulated on the support portion 14 can be drained from the through hole 14a. Can be easily discharged. Thereby, the coupling pin attachment/detachment jig 1 can easily suppress corrosion of the main body 2 .

The inner peripheral edge of the support portion 14 is preferably located closer to the center than the inner peripheral edge of the fixing portion 11 (more specifically, the engaging portion 11a). More specifically, the inner peripheral edge of the support portion 14 is preferably located closer to the center than the inner peripheral edge of the fixed portion 11 within a range not closer to the center than the inner peripheral edge of the projecting portion 32 . According to this configuration, the coupling pin attachment/detachment jig 1 reduces the step between the peripheral edges of the pair of first pin holes H and the second pin holes and the inner peripheral edge of the support portion 14, so that the coupling pin 3 can be attached to the support portion. 14 can be easily and reliably guided. From the viewpoint of reducing the difference in level between the pair of first pin hole H and second pin hole peripheral edges and the inner peripheral edge of the support part 14, the coupling pin attachment/detachment jig 1 has the inner peripheral edge of the support part 14 , is also preferably at least partially flush with the inner peripheral edge of the projection 32 .

(push bolt)
The push bolt 15 is configured so that the tip thereof can be screwed into the screw hole 3 b for inserting and withdrawing the coupling pin 3 . The push bolt 15 is screwed into the threaded hole 13a on the base end side (head side) so that the tip portion is positioned on the fixed portion 11 side and the head portion is positioned on the opposite side of the fixed portion 11 .

The shape of the head of the push bolt 15 may be any shape that allows the push bolt 15 to be rotated by a tool, and it is preferable to adopt the shape and dimensions of a general hexagon head. Tools for hexagon bolts with relatively large diameters are widely distributed, and sockets that can be used for impact wrenches are particularly easy to obtain. Also, the head of the push bolt 15 may have a square hole with which the square drive (convex insertion part) of the impact wrench directly engages.

Also, the push bolt 15 may have a head shape for a hexagon bolt with a nominal diameter smaller than the diameter of the threaded portion. Conversely, the push bolt 15 can be prevented from bending by adopting a threaded portion having a nominal diameter larger than that of available tools.

(Pressing member)
The pressing member 16 is screwed onto the tip side of the push bolt 15, and presses the coupling pin 3 when the coupling pin 3 is inserted and removed. The pressing member 16 abuts on one axial end of the shaft portion 3a of the coupling pin 3 when the tip portion of the push bolt 15 is screwed into the insertion/removal screw hole 3b. The pressing member 16 is, for example, a nut. The pressing member 16 presses one end of the shaft portion 3 a of the coupling pin 3 to fix the coupling pin 3 to the push bolt 15 so as not to rotate. The connecting pin attachment/detachment jig 1 can integrally rotate the connecting pin 3 and the push bolt 15 by pressing the connecting pin 3 with the pressing member 16 . The connecting pin attachment/detachment jig 1 presses the connecting pin 3 with the pressing member 16 to prevent the connecting pin 3 from rotating around the axis of the pressing bolt 15 independently of the pressing bolt 15, thereby preventing the connecting pin 3 from rotating around the axis of the pressing bolt 15. It is possible to easily and reliably prevent the bolt 15 from coming off the coupling pin 3 .

[Method of attaching and detaching coupling pin]
A method for attaching and detaching the coupling pin 3 using the coupling pin attachment/detachment jig 1 will be described with reference to FIG. The coupling pin attachment/detachment method includes a step of engaging the fixing portion 11 of the coupling pin attachment/detachment jig 1 with the projecting portion 32 of the first connector 21a (engagement step), and screwing the push bolt 15 using an impact wrench X. Alternatively, a step (insertion/removal step) of inserting/removing the coupling pin 3 into/from the pair of the first pin hole H and the second pin hole by unscrewing is provided.

When the connecting pin 3 is inserted into the pair of first pin hole H and second pin hole, the connecting pin 3 is inserted into the pair of the connecting pin 3 while the tip of the push bolt 15 is screwed into the threaded hole 3b for insertion and removal of the shaft portion 3a. into the first pin hole H and the second pin hole side. On the other hand, when the coupling pin 3 is pulled out from the pair of first pin hole H and the second pin hole, the coupling pin 3 is pulled out while the tip of the push bolt 15 is screwed into the insertion/removal screw hole 3b of the shaft portion 3a. Pull out to the holding part 13 side.

(engagement process)
In the engaging step, first, the first connector 21a and the second connector 22a are fitted together so that the pair of first pin holes H and second pin holes are coaxial. Subsequently, in the engaging step, the fixing pin P is removed as necessary, and the projecting portion 32 is adjusted so that the engaging projection 11c of the fixing portion 11 is engaged with the notch 32b of the projecting portion 32 of the first connector 21a. The fixing part 11 is fitted on the outside. Further, in the engaging step, the engaging member 12 is engaged with the first locking hole 32a and the second locking hole 11b in this outer fitting state.

(insertion/extraction process)
Regarding the insertion/removal process, first, the case where the coupling pin 3 is inserted into the pair of the first pin hole H and the second pin hole will be described. In the insertion/removal step, first, the coupling pin 3 is placed on the inner peripheral surface of the support portion 14, and the tip of the push bolt 15 is screwed into the insertion/removal screw hole 3b of the coupling pin 3. As shown in FIG. Next, in the insertion/removal step, the pressing member 16 is screwed to abut against one end of the shaft portion 3a of the coupling pin 3 in the axial direction. Further, in the inserting/removing process, the push bolt 15 is rotated and screwed in with the impact wrench X, and the connecting pin 3 is pushed toward the pair of first pin holes H and second pin holes, thereby inserting the connecting pin 3 into the pair of second pin holes. It is inserted into the 1st pin hole H and the 2nd pin hole.

On the other hand, when extracting the coupling pin 3 from the pair of first pin hole H and the second pin hole, the tip of the push bolt 15 is first screwed into the insertion/extraction threaded hole 3b of the coupling pin 3 in the insertion/extraction step. Next, in the insertion/removal step, the pressing member 16 is screwed to abut against one end of the shaft portion 3a of the coupling pin 3 in the axial direction. Further, in the insertion/removal step, the impact wrench X is used to rotate and unscrew the push bolt 15, thereby extracting the coupling pin 3 from the pair of first pin hole H and second pin hole.

<Advantages>
The coupling pin attachment/detachment jig 1 is configured such that the fixing portion 11 is fitted onto the projecting portion 32 provided on the first plate-like portion 31a of the first connector 21a, and the first locking hole 32a formed in the projecting portion 32 and the fixing hole 32a are formed. By engaging the engaging member 12 with the second locking hole 11b formed in the portion 11, it can be attached to the first connector 21a. In the connecting pin attaching/detaching jig 1, a push bolt 15 is screwed into a threaded hole 13a formed in a holding portion 13, and by rotating the push bolt 15 in a screwing direction, the connecting pin 3 is connected to a pair of first pins. It can be inserted into the hole H and the second pin hole. Further, the connecting pin attachment/detachment jig 1 can pull out the connecting pin 3 from the pair of first pin hole H and second pin hole by rotating the push bolt 15 in the unscrewing direction. That is, the coupling pin attachment/detachment jig 1 enables the single coupling pin 3 to be inserted and removed by screwing and unscrewing the push bolt 15 without using hydraulic power. Therefore, the joint pin attachment/detachment jig 1 can easily insert and remove the joint pin at low cost.

The coupling pin attachment/detachment jig 1 can be easily attached to and detached from the projecting portion 32, and the coupling pin 3 can be easily inserted and removed in a relatively small space.

The connecting pin attachment/detachment jig 1 slides the connecting pin 3 on the inner peripheral surface of the supporting portion 14 in the longitudinal direction of the supporting portion 14 and slides the connecting pin 3 into a pair of first pin hole H and second pin hole. can be inserted and removed. Therefore, according to the connecting pin attachment/detachment jig 1, even if there is no space for pushing out the connecting pin 3 inserted into the pair of first pin hole H and the second pin hole to the side opposite to the jig, the connecting pin 3 can be easily removed. and can be pulled out. Further, generally, the coupling pin 3 for construction machinery weighs about 20 kg or more, which is very heavy. However, according to the joint pin attachment/detachment jig 1, the joint pin 3 can be held on the inner peripheral surface of the support portion, so that the joint pin 3 can be safely inserted and removed manually.

In the coupling pin attaching/detaching method, the coupling pin attaching/detaching jig 1 is used so that the coupling pin 3 can be easily inserted/extracted at low cost.

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, according to the embodiment, it is possible to omit, replace, or add components of each part of the embodiment based on the description of the present specification and common general technical knowledge, and all of them should be interpreted as belonging to the scope of the present invention. be.

For example, the support may not have a through-hole for draining water. The coupling pin attaching/detaching jig is temporarily attached to the first connector when attaching/detaching the coupling pin. Therefore, even if the coupling pin attachment/detachment jig does not have the through hole, it can be removed from the first connector after the attachment/detachment operation of the coupling pin, so that the water accumulated on the support portion can be easily discharged.

The coupling pin attachment/detachment jig may be separately provided as a coupling pin insertion-dedicated article and a coupling pin extraction-dedicated article. In this case, for example, the attachment/detachment jig dedicated to inserting the coupling pin may not have a pressing member at the tip of the pressing bolt. Further, the attachment/detachment jig dedicated to inserting the coupling pin may have a contact member at the tip of the push bolt that contacts one end of the shaft portion of the coupling pin. It is preferable that the abutment member is rotatably provided around the axis of the push bolt. The coupling pin attachment/detachment jig can push the coupling pin in the insertion direction by means of this contact member.

The fixing portion does not necessarily have to have the engaging projection. The coupling pin attachment/detachment jig can be configured in a shape corresponding to the shape of the projecting portion of the first connector. Therefore, for example, if the projecting portion does not have a notch formed from the distal end side toward the proximal end side in the projecting direction, the coupling pin attachment/detachment jig can be secured to the projecting portion only by the above-described engaging member. can also be fixed to Furthermore, even if the projecting portion has the notch, if the notch is not disposed at a position facing the first locking hole, the joint pin attachment/detachment jig may have the above-mentioned first locking hole. 2. The locking hole and the engaging projection do not have to be disposed at radially opposite positions of the fixing portion. In addition, if the projecting portion has a projection projecting radially outward, the fixing portion of the coupling pin attachment/detachment jig may have a notch that can be engaged with the projection.

As described above, in the coupling pin attachment/detachment jig, it is preferable that the second locking hole is a screw hole and the engagement member is a bolt from the viewpoint of preventing the engagement member from coming off. However, if the possibility of the engaging member falling off is low, such as when the second locking hole is formed at the upper end of the engaging portion, the second locking hole need not be a screw hole. There is no requirement that the engaging member be a bolt.

As described above, the support portion is preferably gutter-shaped from the viewpoint of easily guiding the coupling pin. However, the supporting portion may be a plurality of rod-like members or plate-like members, for example, as long as the connecting pin can be held and the connecting pin can be smoothly inserted and removed without guiding the connecting pin. In addition, if the supporting portion can guide the coupling pin appropriately or if the coupling pin can be smoothly inserted and removed without guiding the coupling pin, the inner peripheral edge of the supporting portion should be lower than the inner peripheral edge of the fixing portion. may not be located near the center.

INDUSTRIAL APPLICABILITY The coupling pin attachment/detachment jig and the coupling pin attachment/detachment method according to the present invention can be suitably used for inserting and removing large coupling pins in construction machinery, such as connecting a plurality of divided booms.

Reference Signs List 1 coupling pin attachment/detachment jig 2 main body 3 coupling pin 3a shaft portion 3b insertion/extraction screw hole 11 fixing portion 11a engagement portion 11b second locking hole 11c engagement projection 12 engagement member 13 holding portion 13a screw hole 14 support portion 14a Through hole 15 Push bolt 16 Pressing member 21 Boom 21a First connector 22 Rotating frame 22a Second connectors 31a, 31b First plate-like portion 32 Protruding portion 32a First locking hole 32b Notch 33 Second plate-like portion H First Pin hole P Fixing pin X Impact wrench

Claims (7)

It has a pair of first plate-shaped portions facing each other with a space therebetween, coaxial first pin holes are formed in the pair of first plate-shaped portions, and the first pin holes are formed in one of the first plate-shaped portions. is inserted between the pair of first plate-like portions and a first connector having a first locking hole formed in the radial direction of the protrusion. and a second connector having a second plate-shaped portion formed with a second pin hole coaxially arranged with the first pin hole. A coupling pin attachment/detachment jig capable of inserting and removing a coupling pin,
an annular fixing portion configured to be externally fitted to the projecting portion and having a second locking hole penetrating in the radial direction;
an engaging member that can be engaged with the first locking hole and the second locking hole;
a holding portion having a threaded hole penetrating therethrough which can be coaxial with the pair of first pin holes and the second pin hole, the holding portion being spaced apart from the fixing portion in the axial direction of the fixing portion;
a support part that connects the fixing part and the holding part below the pair of first pin hole and the second pin hole and is capable of supporting the coupling pin from below during insertion and removal;
A coupling pin attachment/detachment jig comprising a push bolt screwed into the screw hole. The fixing portion is formed with an engaging projection that protrudes radially inward from the inner peripheral surface thereof, and the engaging projection is a cut formed from the distal end side toward the proximal end side in the projecting direction of the projecting portion. 2. The coupling pin attachment/detachment jig according to claim 1, which is configured to be engageable with the notch. 3. The coupling pin attachment/detachment jig according to claim 2, wherein the second locking hole and the engaging projection are arranged at radially opposite positions of the fixing portion. 4. The coupling pin attachment/detachment jig according to claim 1, 2 or 3, wherein the support portion has a gutter shape extending in the insertion/removal direction of the coupling pin. 5. The coupling pin attaching/detaching jig according to claim 4, wherein the inner peripheral edge of the support portion is located closer to the center than the inner peripheral edge of the fixing portion. 6. The coupling pin attachment/detachment jig according to any one of claims 1 to 5, further comprising a pressing member that is screwed onto the tip side of the push bolt and integrates the push bolt with the coupling pin. a step of engaging the fixed portion of the coupling pin attachment/detachment jig according to any one of claims 1 to 6 with the projecting portion of the first connector;
A coupling pin attaching/detaching method comprising: inserting and extracting the coupling pin into the pair of first and second pin holes by screwing or unscrewing the push bolt using an impact wrench.

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