JP2020090379A - Coupling pin attachment/detachment tool and method of attaching/detaching coupling pin - Google Patents

Abstract

To provide a coupling pin attachment/detachment tool by which a coupling pin can be easily inserted/removed at low cost and a method of attaching/detaching a coupling pin.SOLUTION: The coupling pin attachment/detachment tool includes an annular fixing part in that a first pin hole, which is coaxial with a pair of first plate-like parts facing each other with an interval, is formed, an annular protruding part protruding from a peripheral edge of the first pin hole is formed in one of the first plate-like parts, and a second locking hole is formed to be externally engaged with a protruding part of a first connector provided with a first locking hole in a radial direction of the protruding part so as to pass therethrough in the radial direction, an engaging member that can be screwed into the first locking hole and the second locking hole, a holding part arranged to be spaced from the fixing part in that a screw hole, which can be coaxial with the pair of first pin holes and the second pin hole of the second connector, is formed to pass therethrough, a supporting part that connects the fixing part and the holding part to each other at a lower side than the pair of first pin holes and the second pin hole and can support the connection pin from below at the time of insertion/extraction, and a push bolt screwed with the screw hole.SELECTED DRAWING: Figure 1

Description

The present invention relates to a connecting pin attaching/detaching jig and a connecting pin attaching/detaching method.

For example, for connecting the swing frame of the upper revolving structure of a large crane to the boom, and for connecting the components of the crane attachment, connecting holes formed in overlapping portions of these members so that these members can be detachably connected. A connection structure in which a coupling pin is inserted in the is widely adopted.

Generally, for the connection between the plurality of members, a first connector having a pair of first plate-shaped portions that are opposed to each other with a space therebetween, and coaxial first pin holes are formed, and the pair of first plate-shaped portions. A second connector having a second plate-shaped portion inserted between and having a second pin hole arranged coaxially with the first pin hole is used. The connection between the first connector and the second connector is performed by inserting the coupling pin into the pair of first pin hole and second pin hole that are coaxially arranged.

As such a connection structure between the first connector and the second connector, for example, a coupling pin (insertion pin) inserted into a pair of the first pin hole and the second pin hole, and a hydraulic cylinder for projecting and retracting the coupling pin. And a structure using a connecting pin having a spring for urging the connecting pin in the protruding direction is proposed (see Japanese Patent Laid-Open No. 2012-41148).

The connecting pin described in the above publication is configured such that the connecting pin can be retracted and retracted by expansion and contraction of the hydraulic cylinder, and by holding the protruding state of the connecting pin with a spring, the connecting pin is formed into a pair of first pin hole and second pin hole. It is configured to be maintainable in the hole.

JP, 2012-41148, A

The connecting pin described in the above publication uses hydraulic power and requires a hydraulic cylinder for inserting and removing the connecting pin. Therefore, this connecting pin is heavy and difficult to handle by hand. Further, this connecting pin requires a power source such as a hydraulic tank and a pump, which increases the manufacturing cost.

In view of the above-mentioned inconveniences, an object of the present invention is to provide a connecting pin attaching/detaching jig and a connecting pin attaching/detaching method capable of easily inserting and removing the connecting pin at low cost.

A connecting pin attaching/detaching jig according to the present invention made to solve the above problem has a pair of first plate-shaped portions facing each other with a space therebetween, and a first coaxial member that is coaxial with the pair of first plate-shaped portions. A pin hole is formed, an annular protruding portion is formed on one of the first plate-shaped portions and protrudes outward from the peripheral edge of the first pin hole in the opposite direction, and a first locking hole is formed in the radial direction of the protruding portion. A second connector having a formed first connector and a second plate-shaped portion formed between the pair of first plate-shaped portions and having a second pin hole formed coaxially with the first pin hole. A connecting pin attaching/detaching jig capable of inserting/removing the connecting pin into/from the pair of first pin hole and second pin hole for detaching and attaching An annular fixing portion having a second locking hole, an engaging member that can be engaged with the first locking hole and the second locking hole, and a pair of the first pin hole and the second pin hole that are coaxial with each other. A threaded hole that can be a through hole is formed therethrough, and the fixing portion and a holding portion that is arranged at a distance in the axial direction of the fixing portion, and below the pair of first pin holes and second pin holes. The fixing portion and the holding portion are connected to each other, and a supporting portion capable of supporting the coupling pin from below at the time of insertion/removal and a push bolt screwed into the screw hole are provided.

The connecting pin attaching/detaching jig has a ring-shaped fixing portion externally fitted to a ring-shaped protruding portion provided on the first plate-shaped portion of the first connector, and the first locking hole and the fixing portion formed on the protruding portion. By engaging the engaging member with the second locking hole formed in the first connector, the second connector can be attached to the first connector. The connecting pin attaching/detaching jig is configured such that a pressing bolt is screwed into a screw hole formed in a holding portion arranged at a distance from the fixing portion, and the connecting pin is rotated by screwing the pressing bolt. It can be inserted into the pair of first and second pin holes. In addition, the connecting pin attaching/detaching jig can extract the connecting pin from the pair of first pin hole and second pin hole by rotating the push bolt in the screw-returning direction. In other words, the connecting pin attaching/detaching jig allows the connecting pin alone to be inserted/removed by screwing and unscrewing the push bolt without using hydraulic power. Therefore, the connecting pin attaching/detaching jig can easily insert and remove the connecting pin at low cost.

An engaging projection is formed on the fixed portion so as to project inward in the radial direction from the inner peripheral surface of the fixing portion. The engaging projection is formed from the distal end side in the protruding direction of the protruding portion toward the base end side. It is preferable that the notch can be engaged. In this way, the engaging portion is formed on the fixed portion so as to project inward in the radial direction from the inner peripheral surface thereof, and the engaging protrusion extends from the front end side in the protruding direction of the protruding portion toward the base end side. By being configured to be engageable with the formed notch, the fixing portion can be reliably fixed to the protruding portion.

It is preferable that the second locking hole and the engagement protrusion are arranged at positions facing each other in the radial direction of the fixing portion. Thus, by disposing the second locking hole and the engaging projection at the positions of the fixing portion that are opposed to each other in the radial direction, the fixing of the fixing portion to the protruding portion becomes more reliable.

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

The inner peripheral edge of the supporting portion may be located closer to the center than the inner peripheral edge of the fixing portion. In this way, the inner peripheral edge of the support portion is located closer to the center than the inner peripheral edge of the fixing portion, so that the peripheral edges of the pair of first pin holes and second pin holes and the inner peripheral edge of the support portion are formed. The step between them can be reduced, and the coupling pin can be easily and reliably guided by the support portion.

The connecting pin attaching/detaching jig may further include a pressing member that is screwed onto the tip end side of the pressing bolt to integrate the pressing bolt with the connecting pin. As described above, by further including the pressing member that is screwed to the tip end side of the push bolt and that integrates the push bolt with the coupling pin, it is possible to prevent the coupling pin from rotating around the axis of the push bolt. The connecting pin can be easily and reliably inserted and removed.

Further, a connecting pin attaching/detaching method according to the present invention made to solve the above-mentioned problems includes a step of engaging the fixing portion of the connecting pin attaching/detaching jig with a protruding portion of the first connector, and an impact wrench. Inserting the connecting pin into the pair of first pin holes and the second pin hole by screwing or unscrewing the push bolt.

The connecting pin attaching/detaching method uses the connecting pin attaching/detaching jig having the above-described configuration, so that the connecting pin can be easily inserted/removed at low cost.

In the present invention, “lower” means “lower” when the connecting pin attaching/detaching jig is attached to the protruding portion of the first connector. The “trough shape” means a partial tubular shape in which a part of the circumferential direction is cut out along the axial direction.

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

FIG. 3 is a schematic perspective view of the coupling pin attaching/detaching jig according to the embodiment of the present invention seen from diagonally above. It is a schematic diagram which shows an example of the connection structure connected by the connecting pin using the connecting pin attachment/detachment jig of FIG. It is a typical expanded perspective view which shows the connection part of the connection structure of FIG. It is the typical perspective view which looked at the main part of the connecting pin attachment/detachment jig of Drawing 1 from the slanting lower side. FIG. 4 is a schematic perspective view showing a state in which the connecting pin attaching/detaching jig of FIG. 1 is attached to the connecting portion of FIG. 3. FIG. 6 is a schematic perspective view showing a state in which the connecting pin is extracted from the connecting portion of FIG. 5 using the connecting pin attaching/detaching jig of FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Connecting pin attachment/detachment jig]
FIG. 1 shows a connecting pin attaching/detaching jig 1 according to an embodiment of the present invention.

Before describing the connecting pin attaching/detaching jig 1, as an example of a connecting structure connected by connecting pins using the connecting pin attaching/detaching jig 1, a boom 21 and a swing frame 22 ( 3 shows a connection structure with a revolving frame provided on the upper revolving structure). In addition, as the connection structure other than the above, for example, a connection structure between a boom of a tower crane and a jib can be cited.

In the connection structure of FIGS. 2 and 3, a first connector 21a is formed at the end of the boom 21 on the side connected to the swing frame 22, and a second connector 22a is formed at the connection portion of the swing frame 22 with the boom 21. Are formed. The first connector 21a and the second connector 22a are detachably connected by the coupling pin 3.

The first connector 21a has a pair of first plate-shaped portions 31a and 31b facing each other with a space therebetween. A coaxial first pin hole H is formed in the pair of first plate-shaped portions 31a and 31b, and an annular protrusion projecting outward from the peripheral edge of the first pin hole H in the first plate-shaped portion 31a in the opposite direction. The part 32 is formed. The protrusion 32 has, for example, a cylindrical shape. A first locking hole 32a is formed in the radial direction of the protrusion 32. Further, the protruding portion 32 is formed with a notch 32b from the front end side in the protruding direction toward the base end side. The first locking hole 32a and the notch 32b are formed at the radially opposite positions of the projecting portion 32.

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

The 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 which is inserted into the pair of first pin hole H and second pin hole, and the tip of a push bolt 15 described later is provided at the center of one axial end of the shaft portion 3a. An insertion/extraction screw hole 3b that can be screwed into the portion is formed. Both ends of the fixed pin P, which penetrates the coupling 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 coupling pin 3 does not drop from the connection structure. It is prevented.

The connecting pin attaching/detaching jig 1 is configured such that the connecting pin 3 can be inserted into and removed from the pair of first pin holes H and second pin holes. As shown in FIGS. 1 and 4, the coupling pin attaching/detaching jig 1 is configured to be externally fitted to the protruding portion 32, and has an annular fixing portion 11 having a second locking hole 11b penetrating in the radial direction, An engaging member 12 engageable with the first locking hole 32a and the second locking hole 11b and a screw hole 13a which can be coaxial with the pair of first pin hole H and second pin hole are formed so as to penetrate therethrough, The fixing portion 11 and the holding portion 13 arranged with a space in the axial direction of the fixing portion 11 are connected to the fixing portion 11 and the holding portion 13 below the pair of first pin holes H and second pin holes. In addition, a support portion 14 that can support the coupling pin 3 from below at the time of insertion and removal and a push bolt 15 that is screwed into the screw hole 13a are provided. Further, the connecting pin attaching/detaching jig 1 includes a pressing member 16 that is screwed onto the tip end side of the pressing bolt 15 and that integrates the pressing bolt 15 with the connecting 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 connecting pin attaching/detaching jig 1. The main body 2 has, for example, a metal as a main component. 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 connecting pin attaching/detaching jig 1 is composed of the fixing portion 11, the holding portion 13, and the supporting portion 14, it is easy to reduce the weight and can be manufactured at a relatively low cost.

The connecting pin attaching/detaching jig 1 is attached to the projecting portion 32 with the fixing pin P pulled out from the first locking hole 32a and the notch 32b of the first connector 21a. As shown in FIG. 5, the connecting pin attaching/detaching jig 1 is attached to the protruding portion 32 by fitting the fixing portion 11 onto the protruding portion 32.

(Fixed part)
The fixed portion 11 has an annular engagement portion 11 a that can be externally fitted to the protruding portion 32. The inner peripheral surface of the engaging portion 11 a has a shape corresponding to the outer peripheral surface of the protruding portion 32. In this embodiment, the engaging portion 11a has a cylindrical shape. The 2nd locking hole 11b has penetrated the engaging part 11a in the radial direction. Specifically, the second locking hole 11b penetrates the lower end of the engaging portion 11a in the vertical direction. The second locking hole 11b is preferably a screw hole. The second locking hole 11b is formed at a position where the second locking hole 11b overlaps with the first locking hole 32a in a state where the fixed portion 11 is fitted onto the protruding portion 32 so as to communicate with the first locking hole 32a of the protruding portion 32. ..

The fixed portion 11 has an engagement protrusion 11c that protrudes radially inward from the inner peripheral surface of the engagement portion 11a. As shown in FIG. 5, the engagement protrusion 11c is configured to be engageable with the notch 32b formed in the protrusion 32 from the front end side to the base end side in the protruding direction. The engagement protrusion 11c and the second locking hole 11b are arranged at positions radially opposite to the fixed portion 11 (more specifically, the engagement portion 11a). That is, in this embodiment, the engagement protrusion 11c is configured to protrude downward from the upper end of the inner peripheral surface of the engagement portion 11a. In addition, "upper" means "upper" in a state in which the connecting pin attaching/detaching jig is attached to the protruding portion of the first connector.

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

(Engagement member)
The engaging member 12 fixes the fixing portion 11 to the protruding portion 32 by engaging with the first locking hole 32a and the second locking hole 11b. The engagement 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 above-mentioned screw hole, the engaging member 12 is preferably a bolt. According to this configuration, even when the second locking hole 11b is formed at the lower end of the engaging portion 11a, the engaging member 12 is screwed into the second locking hole 11b, so that the engaging member It is possible to easily and surely prevent 12 from falling off.

The connecting 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. Thereby, the connecting pin attaching/detaching jig 1 can regulate the movement of the fixing portion 11 in the circumferential direction and the axial direction. Further, the connecting pin attaching/detaching jig 1 is configured such that, in addition to the engagement of the engaging member 12, the engaging protrusion 11c is engaged with the notch 32b of the protruding portion 32. Accordingly, the connecting pin attaching/detaching jig 1 uses the notch 32b provided for locking the fixing pin P to more reliably prevent the fixing portion 11 from moving, and makes this fixing portion a protruding portion. Can be securely fixed.

In addition, in the connecting pin attaching/detaching jig 1, the second locking hole 11b and the engaging protrusion 11c are diametrically opposed positions of the engaging portion 11a, particularly when the main body 2 falls off, the upper and lower sides are likely to become fulcrums and action points. Since they are arranged at positions facing each other in the direction, the fixing of the fixing portion 11 to the projecting portion 32 becomes more reliable.

(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 screw hole 13a is formed coaxially with the central axis of the fixed portion 11 so that the tip end of the push bolt 15 can be screwed into the insertion/extraction screw hole 3b of the coupling pin 3 while being screwed into the base end side of the push bolt 15. Has been done. The holding portion 13 preferably has a sufficient thickness so that the screw hole 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 protruding portion 32. The longitudinal length of the support portion 14 is larger than the axial length of the connecting pin 3 so that the connecting pin 3 can be mounted on the inner peripheral surface thereof. The support portion 14 is configured so that the coupling pin 3 can be inserted into and removed from the pair of first pin holes H and second pin holes while sliding the coupling pin 3 in the longitudinal direction on the inner peripheral surface. The connecting pin attaching/detaching jig 1 can properly guide the connecting pin 3 in the longitudinal direction when the connecting pin 3 is inserted/removed because the supporting portion 14 has a trough shape extending in the inserting/removing direction of the connecting pin 3.

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

The inner peripheral edge of the support portion 14 is preferably positioned closer to the center than the inner peripheral edge of the fixed 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 that is not closer to the center than the inner peripheral edge of the protruding portion 32. According to this structure, the connecting pin attaching/detaching jig 1 reduces the step between the peripheral edges of the pair of first pin holes H and the second pin hole and the inner peripheral edge of the supporting portion 14 to support the connecting pin 3 in the supporting portion. It is possible to guide easily and surely by 14. It should be noted that the connecting pin attaching/detaching jig 1 is configured such that the inner peripheral edge of the support portion 14 has a small difference between the peripheral edge of the pair of first pin holes H and the second pin hole and the inner peripheral edge of the support portion 14. It is also preferable that the protrusion 32 is at least partially flush with the inner peripheral edge.

(Push bolt)
The tip of the push bolt 15 is configured to be screwed into the insertion/extraction screw hole 3b of the coupling pin 3. The push bolt 15 is screwed into the screw hole 13a on the base end side (head side) so that the tip end is located on the fixed part 11 side and the head part is located on the opposite side to the fixed part 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 size of the head of a general hexagon bolt. As tools for hexagon bolts, tools for relatively large diameters are widely distributed, and sockets that can be used especially for impact wrenches are easily available. Further, the head portion of the push bolt 15 may have a square hole with which the square drive (convex insertion portion) of the impact wrench is directly engaged.

Further, the push bolt 15 may have the shape of a head for a hexagonal bolt having a nominal diameter smaller than the diameter of the threaded portion. Conversely speaking, the push bolt 15 can employ a threaded portion having a nominal diameter larger than that of an available tool to prevent the threaded portion from bending.

(Pressing member)
The pressing member 16 is screwed on the tip side of the push bolt 15 and presses the connecting pin 3 when the connecting pin 3 is inserted and removed. The pressing member 16 comes into contact with one end in the axial direction of the shaft portion 3a of the coupling pin 3 when the tip end portion of the pressing bolt 15 is screwed into the insertion/extraction screw hole 3b. The pressing member 16 is, for example, a nut. The pressing member 16 presses one end of the shaft portion 3a of the connecting pin 3 to fix the connecting pin 3 to the push bolt 15 in a non-rotatable manner. The connecting pin attaching/detaching jig 1 can rotate the connecting pin 3 and the push bolt 15 integrally by pressing the connecting pin 3 with the pressing member 16. The connecting pin attaching/detaching jig 1 prevents the connecting pin 3 from rotating around the axis of the pressing bolt 15 independently of the pressing bolt 15 by pressing the connecting pin 3 with the pressing member 16, and pushes at the time of insertion/removal. It is possible to easily and surely prevent the bolt 15 from falling off the connecting pin 3.

[How to attach/detach the connecting pin]
With reference to FIG. 6, a method for attaching/detaching the connecting pin 3 using the connecting pin attaching/detaching jig 1 will be described. The connecting pin attaching/detaching method includes a step of engaging the fixing portion 11 of the connecting pin attaching/detaching jig 1 with the protruding portion 32 of the first connector 21a (engaging step), and screwing the push bolt 15 with the impact wrench X. Alternatively, the step of inserting and removing the coupling pin 3 into and from the pair of first pin hole H and second pin hole by screwing back (insertion/extraction step) is provided.

When the coupling pin 3 is inserted into the pair of first pin hole H and second pin hole, the pair of coupling pins 3 is inserted with the tip end portion of the push bolt 15 screwed into the insertion/extraction screw hole 3b of the shaft portion 3a. The first pin hole H and the second pin hole side. On the other hand, when the connecting pin 3 is pulled out from the pair of first pin hole H and second pin hole, the connecting pin 3 is inserted with the tip end portion of the push bolt 15 screwed into the insertion/extraction 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 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 needed, and then the protrusion 32 is formed so that the notch 32b of the protrusion 32 of the first connector 21a is engaged with the engaging protrusion 11c of the fixing portion 11. The fixed portion 11 is fitted on the outer surface of the fixed portion 11. 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 external fitting state.

(Insertion/removal process)
Regarding the insertion/removal process, first, a case where the coupling pin 3 is inserted into the pair of first pin hole H and 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 end portion of the push bolt 15 is screwed into the insertion/removal screw hole 3b of the coupling pin 3. Next, in the inserting/removing step, the pressing member 16 is screwed and brought into contact with one end of the connecting pin 3 in the axial direction of the shaft portion 3a. Further, in the inserting/removing step, the push bolt 15 is rotated and screwed by the impact wrench X, and the coupling pin 3 is pushed toward the pair of first pin holes H and the second pin hole, whereby the coupling pin 3 is paired. Insert into the 1st pin hole H and the 2nd pin hole.

On the other hand, when the connecting pin 3 is pulled out from the pair of first pin hole H and second pin hole, the tip end portion of the push bolt 15 is screwed into the inserting/extracting screw hole 3b of the connecting pin 3 in the inserting/removing step. Next, in the insertion/removal step, the pressing member 16 is screwed and brought into contact with one end of the shaft portion 3a of the coupling pin 3 in the axial direction. Further, in the insertion/removal step, the push bolt 15 is rotated by the impact wrench X and unscrewed to pull out the coupling pin 3 from the pair of first pin hole H and second pin hole.

<Advantages>
In the connecting pin attaching/detaching jig 1, the fixing portion 11 is externally fitted to the protruding portion 32 provided on the first plate-shaped portion 31a of the first connector 21a, and the first locking hole 32a and the fixing portion formed in the protruding portion 32 are fixed. 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. The connecting pin attaching/detaching jig 1 is configured such that the pressing bolt 15 is screwed into the screw hole 13a formed in the holding portion 13 and the pressing bolt 15 is rotated in a direction in which the pressing bolt 15 is screwed, thereby connecting the connecting pin 3 to the pair of first pins. It can be inserted into the hole H and the second pin hole. Further, the connecting pin attaching/detaching jig 1 can extract the connecting pin 3 from the pair of first pin hole H and second pin hole by rotating the push bolt 15 in the direction of unscrewing. In other words, the connecting pin attaching/detaching jig 1 allows the connecting pin 3 alone to be inserted/removed by screwing and unscrewing the push bolt 15 without using hydraulic power. Therefore, the connecting pin attaching/detaching jig 1 can easily insert and remove the connecting pin at low cost.

The connecting pin attaching/detaching jig 1 can be easily attached/detached to/from the protruding portion 32, and the connecting pin 3 can be easily inserted/removed in a relatively small space.

The connecting pin attaching/detaching jig 1 slides the connecting pin 3 on the inner peripheral surface of the supporting part 14 in the longitudinal direction of the supporting part 14, while connecting the connecting pin 3 to the pair of first pin holes H and second pin holes. Can be inserted and removed. Therefore, according to the connecting pin attaching/detaching jig 1, even if there is no space for pushing out the connecting pin 3 inserted in the pair of first pin hole H and second pin hole to the side opposite to the jig, the connecting pin 3 can be easily attached. And it can be pulled out reliably. Further, generally, the connecting pin 3 for a construction machine has a weight of about 20 kg or more and is very heavy. However, according to the connecting pin attaching/detaching jig 1, since the connecting pin 3 can be held on the inner peripheral surface of the supporting portion, the connecting pin 3 can be safely inserted and removed manually.

The connecting pin attaching/detaching method uses the connecting pin attaching/detaching jig 1 so that the connecting pin 3 can be easily inserted/removed at low cost.

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

For example, the support may not have a through hole for draining water. The connecting pin attaching/detaching jig is temporarily attached to the first connector when the connecting pin is attached/detached. Therefore, even if the connecting pin attaching/detaching jig does not have the through hole, by removing the connecting pin from the first connector after the attaching/detaching operation of the connecting pin, the water accumulated on the support portion can be easily discharged.

The connecting pin attaching/detaching jig may be separately provided as a connecting pin inserting-only product and a connecting pin extracting-only product. In this case, for example, the attachment/detachment jig for inserting the connecting pin may not have the pressing member at the tip of the pressing bolt. Further, the attachment/detachment jig for inserting the connecting pin may have an abutting member that abuts on one end of the shaft portion of the connecting pin at the tip of the push bolt. It is preferable that the contact member is provided so as to be rotatable around the axis of the push bolt. The connecting pin attaching/detaching jig can push the connecting pin in the insertion direction by the contact member.

The fixing portion does not necessarily have to have the engaging protrusion. The connecting pin attaching/detaching jig can be configured in a shape corresponding to the shape of the protruding portion of the first connector. Therefore, for example, when the protruding portion does not have a notch formed from the distal end side toward the proximal end side in the protruding direction, the coupling pin attaching/detaching jig has the protruding portion formed only by the engaging member. It is also possible to fix to. Further, even when the protruding portion has the notch, if the notch is not arranged at a position facing the first locking hole, the connecting pin attaching/detaching jig of the jig is not provided. The 2 locking holes and the engaging protrusions may not be arranged at the radially opposite positions of the fixed portion. In addition, if the protrusion has a protrusion protruding outward in the radial direction, the coupling pin attaching/detaching jig may have a notch formed in the fixing portion so that the protrusion can be engaged with the protrusion.

As described above, in the coupling pin attaching/detaching jig, it is preferable that the second engaging hole is a screw hole and the engaging member is a bolt from the viewpoint of preventing the engaging member from falling off. However, the second locking hole need not be a screw hole if the risk of the engaging member coming off is low, such as when the second locking hole is formed at the upper end of the engaging portion. Neither is it necessary that the engagement member be a bolt.

As described above, it is preferable that the support portion has a gutter shape from the viewpoint of easily guiding the coupling pin. However, for example, the supporting portion may be a plurality of rod-shaped members or flat plate-shaped members as long as the connecting pin can be held and the connecting pin can be smoothly inserted and removed without guiding the connecting pin. If the support portion can properly guide the coupling pin or if the coupling pin can be smoothly inserted and removed without guiding the coupling pin, the inner peripheral edge of the support portion is larger than the inner peripheral edge of the fixing portion. Does not have to be located near the center.

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

1 coupling pin attaching/detaching jig 2 main body 3 coupling pin 3a shaft portion 3b insertion/extraction screw hole 11 fixing portion 11a engaging portion 11b second locking hole 11c engaging protrusion 12 engaging member 13 holding portion 13a screw hole 14 supporting portion 14a Through hole 15 Push bolt 16 Pushing member 21 Boom 21a First connector 22 Revolving frame 22a Second connector 31a, 31b First plate-shaped portion 32 Projection portion 32a First locking hole 32b Notch 33 Second plate-shaped portion H First Pin hole P Fixed pin X Impact wrench

Claims (7)

It has a pair of 1st plate-shaped part which opposes at intervals, and a 1st pin hole which is coaxial is formed in this 1st plate-shaped part of this pair, and the said 1st pin hole is formed in one said 1st plate-shaped part. Is inserted between the pair of first plate-shaped portions and a first connector having a first locking hole formed in a radial direction of the protruding portion, the annular protruding portion protruding outward from a peripheral edge of the protruding portion in the opposite direction. A pair of the first pin hole and the second pin hole for attaching and detaching a second connector having a second plate-shaped portion having a second pin hole formed coaxially with the first pin hole. A connecting pin attachment/detachment tool that can insert and remove connecting pins.
An annular fixing portion configured to be externally fitted to the protruding portion and having a second locking hole penetrating in the radial direction;
An engaging member engageable with the first locking hole and the second locking hole,
A screw hole that can be coaxial with the pair of the first pin hole and the second pin hole, is formed so as to penetrate therethrough;
A support part that connects the fixing part and the holding part on the lower side of the pair of first pin hole and second pin hole, and that can support the connecting pin from below at the time of insertion and removal;
A coupling pin attachment/detachment jig comprising a push bolt that is screwed into the screw hole. An engaging projection is formed on the fixed portion so as to project inward in the radial direction from the inner peripheral surface of the fixing portion. The engaging projection is formed from the distal end side in the protruding direction of the protruding portion toward the base end side. The coupling pin attaching/detaching jig according to claim 1, which is configured to be engageable with the notch. The coupling pin attachment/detachment jig according to claim 2, wherein the second locking hole and the engagement protrusion are arranged at radially opposing positions of the fixing portion. The coupling pin attaching/detaching 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. The coupling pin attaching/detaching jig according to claim 4, wherein the inner peripheral edge of the supporting portion is located closer to the center than the inner peripheral edge of the fixing portion. The coupling pin attaching/detaching 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 that integrates the push bolt with the coupling pin. Engaging the fixing portion of the connecting pin attaching/detaching jig according to any one of claims 1 to 6 with the protruding portion of the first connector;
And a step of screwing or unscrewing the push bolt with an impact wrench to insert and remove the connecting pin into and from the pair of first pin hole and second pin hole.

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