JP2009013730A - Connection pin attaching/detaching jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection pin attaching/detaching jig which is of a single type, and can attach and detach connection pins having different external diameters. <P>SOLUTION: The connection pin attaching/detaching jig is formed of: a hydraulic cylinder 41 which moves a cylinder connection pin 23 (connection pin) in an axial direction; a cylindrical member 42 which supports a tube 41a of the hydraulic cylinder 41 on a proximal end, allows a rod 41b of the hydraulic cylinder 41 to reciprocatively move therein, and has a tip abutting on the peripheral edge of an attachment-side pin insertion hole 22a (pin hole) of a cylinder support 22; a tensile reaction receiving member 43 which is arranged at the tip of the cylindrical member 42 for receiving a tensile reaction applied to the cylindrical member 42; and a locking member 45 which has a proximal end connected to the tensile reaction receiving member 43, and a tip locked to a front boom 6 (first connector). Then the tensile reaction receiving member 43 is made rotatable about the axial direction of the cylindrical member 42 with respect to an eye bolt 44. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connecting pin detachment jig which is inserted into a pin hole provided in each of a first connecting body and a second connecting body of a construction machine, and which inserts and removes a connecting pin which connects the first and second connecting bodies. It is about.

  Conventionally, large excavators and dismantling machines have to disassemble the attachment to limit transportation. In large construction machines, the attachment pin has a large outer diameter and requires a very large force to be inserted and removed, so it is difficult to remove it even if the connection pin is hit manually. .

  For example, in the dismantling machine disclosed in Patent Document 1, a pair of shearing blades are attached to a work arm in a replaceable manner by a connection pin. Each of the pair of shear blades and the working arm is formed with a pin hole for inserting a connection pin. The shearing blade is attached to the working arm by inserting the connecting pin into these pin holes, and the shearing blade is detached from the working arm by removing the connecting pin from the pin hole.

Patent Document 1 discloses a connecting pin detaching device for inserting / removing a connecting pin into / from a pin hole when a shearing blade is exchanged. The connecting / removing device for the connecting pin includes a frame fixed to the working arm. A hydraulic cylinder for moving the connecting pin in the axial direction is attached to the frame. When pulling out the connecting pin using the connecting pin detaching device configured as described above, first, the rod of the hydraulic cylinder is contracted, and the axis of the rod of the hydraulic cylinder and the axis of the connecting pin substantially coincide with each other. In this state, fix the frame to the work arm. After that, by supplying pressure oil to the hydraulic cylinder and extending the rod, the connecting pin is pushed out from the pin hole to the opposite side of the hydraulic cylinder and comes off. On the other hand, when inserting the connecting pin into the pin hole, the rod of the hydraulic cylinder is contracted, the frame is fixed to the working arm, and the connecting pin is attached to the tip of the rod so that its axis is substantially the same as the axis of the pin hole. The connecting pins are pushed into the pin holes by supplying pressure oil to the hydraulic cylinders and extending the rods after arranging them to coincide. By using the desorption device of this Patent Document 1, the cutting blade can be replaced without having to transport the dismantling machine to a factory or service center having a press device, for example, and labor and time required for replacement Can be reduced.
JP 2005-226316 A

  For larger construction machines, the bucket attached to the tip of the arm and the crusher's mounting pin become larger, and the cylinder also becomes two large cylinders. ing.

  However, the size of the connecting pin and the size of the attachment for fixing the frame differ depending on the connecting portion of the attachment. For this reason, in the connection pin removal jig of the above-mentioned patent document 1, all the connection parts cannot be fixed with one frame, and as a result, a plurality of connection pin removal jigs are provided for one construction machine. Must be used. For this reason, there is a problem that the manufacturing cost is increased and the replacement of the connecting pin attaching / detaching jig is troublesome.

  This invention is made | formed in view of this point, The place made into the objective is to enable the attachment / detachment of the connection pin of a different outer diameter with one connection pin removal | desorption jig | tool.

  In order to achieve the above object, in the present invention, at least the tensile reaction force receiving member side of the connecting pin attaching / detaching jig is made rotatable.

  Specifically, in the first invention, the connection pin that is inserted into the pin hole provided in each of the first connection body and the second connection body of the construction machine and connects the first and second connection bodies is inserted and removed. The connecting pin removal tool to be used is the target.

And the connecting pin removal jig is
A hydraulic cylinder for moving the connecting pin in the axial direction;
A tubular member in which the tube of the hydraulic cylinder is supported on the base end side, and the rod of the hydraulic cylinder goes back and forth inside, and the tip can be brought into contact with the peripheral edge of the pin hole of the first connecting body;
A tensile reaction force receiving member attached to the distal end side of the cylindrical member and receiving a tensile reaction force applied to the cylindrical member;
A proximal end side is coupled to the tensile reaction force receiving member, and a distal end side is latched to the first coupling body;
At least the tensile reaction force receiving member is configured to be rotatable about the axial direction of the cylindrical member with respect to the first coupling body.

  According to said structure, although arrangement | positioning of the site | part (henceforth a to-be-latched part) to which the latching member in a 1st coupling body latches differs with the shape of a 1st and 2nd coupling body, when extracting a connection pin In addition, since the tensile reaction force receiving member can rotate around the axial direction in accordance with the locked portion, the locking member is rotated to an optimum position even with respect to the locked portions of different arrangements. Locked to the locked portion. In this state, the connecting pin is pushed out of the pin hole by extending the rod of the hydraulic cylinder while receiving the tensile reaction force by the tensile reaction force receiving member. When inserting the connecting pin, with the tip of the cylindrical member in contact with the periphery of the pin hole, while receiving the compression reaction force, the connecting pin is pulled by shortening the rod of the hydraulic cylinder and pulling the connecting pin. Inserted into the hole. At this time, it is not always necessary to pull the connecting pin into the tubular member, and even if the connecting pin is pulled into the tubular member, the inner diameter of the tubular member is the outer diameter of the largest connecting pin. It is sufficient to make it slightly larger than that, and by doing so, even a plurality of connecting pins having different outer diameters can be easily inserted and removed. Note that the tensile reaction force receiving member alone may be rotatable, or the entire cylindrical member may be rotatable.

In the second invention, in the first invention,
A connecting member that can rotate at least about the axial direction of the rod is provided at the tip of the rod of the hydraulic cylinder.

  According to the above configuration, by rotating the connecting member around the axial direction of the rod, both the rod tip and the connecting pin can be connected easily by inserting the pin in a direction perpendicular to the axial direction. Connected. Further, if the rotation is possible not only in the axial direction of the rod but also in the direction perpendicular to the axial direction, the connecting operation is further facilitated.

In the third invention, in the first or second invention,
On the base end side of the connecting pin, a collar is formed,
The locking member is locked to a side opposite to the flange portion of the connection pin in the first connection body.

  According to said structure, a connection pin is extruded by extending | stretching the rod of a hydraulic cylinder, receiving the tension reaction force in the state which latched the latching member to the 1st coupling body. Conversely, when the rod of the hydraulic cylinder is contracted, the connecting pin is pulled into the pin hole by pulling the connecting pin while receiving the compression reaction force at the tip of the cylindrical member. Thus, even if it is a connection pin which has a collar part, since it inserts / inserts from the front end side, since the collar part of a connection pin does not pass the inside of the cylindrical member which supports a hydraulic cylinder, a cylindrical member There is no need to make it larger to fit the buttocks or to make a notch. Further, since the connecting pin is pushed out when the rod having a large thrust is extended, the connecting pin requiring a larger force can be easily extracted.

In a fourth invention, in any one of the first to third inventions,
The tensile reaction force receiving member is attached to the outer periphery of the distal end of the cylindrical member so as to be rotatable about the axial direction of the cylindrical member.

  According to the above configuration, since only the tensile reaction force receiving member rotates around its axial direction and the locking member and the locked portion of the first coupling body are aligned, the cylindrical member is lifted up. Positioning is easy and the hydraulic cylinder piping does not twist.

In a fifth invention, in any one of the first to fourth inventions,
A guide pipe having an outer diameter slightly smaller than that of the connecting pin is configured to be connectable to the distal end side of the rod of the hydraulic cylinder.

  That is, when the front end side of the connecting pin is pushed and pulled directly by the rod of the hydraulic cylinder, the rod enters the pin hole, so that the pin hole of the first connecting body and the pin hole of the second connecting body are displaced. If this occurs, there is a risk that the rod will be strained and the hydraulic cylinder will be damaged. However, according to the above configuration, since the connecting pin is pushed and pulled through the guide pipe, the rod does not enter the pin hole, and even if the pin hole is displaced, the hydraulic cylinder is not damaged. Moreover, since the guide pipe can be replaced with respect to the tip of the rod, the guide pipe is replaced in correspondence with the pin hole. By doing so, if only a plurality of guide pipes are prepared according to the outer diameter of the connecting pin, it is possible to select one having a slightly smaller outer diameter than the connecting pin to be inserted and removed, and the pin hole. By providing a slight allowance, it is easy to insert and remove even if the pin hole is slightly deviated. Even when the guide pipe enters the cylindrical member, if the inner diameter of the cylindrical member is made larger than that of the guide pipe having the maximum outer diameter, all the connecting pins can be inserted and removed with one cylindrical member.

In the sixth invention, in the fourth or fifth invention,
An adapter that narrows toward the tip is attached to the tip of the guide pipe.

  According to the above configuration, the guide pipe is guided to the pin hole by the adapter even when it is difficult to insert the connecting pin like the clevis pin hole of the cylinder having the spherical bearing or the pin holes of the two cylinders. Therefore, the guide pipe can be easily inserted.

In a seventh invention, in the first to sixth inventions,
The locking member is configured to be locked to an eyebolt fastened to the first connecting body.

  According to the above configuration, the eyebolt only needs to be fastened when the connecting pin is inserted or removed, so that the eyebolt does not get in the way during normal operation, etc., and the tap having a screw hole or screw hole on the first connecting body side Since the eyebolt can be attached simply by providing the block, the structure is simple, and the increase in the mass of the first coupling body can be minimized.

In an eighth invention, in any one of the first to seventh inventions,
The said locking member shall consist of a chain and the hook connected with the front-end | tip.

  According to the above configuration, the chain can be twisted or bent while the hook is hooked on the locked portion of the first linking body. easy.

In a ninth invention, in the first to eighth inventions,
The cylindrical member is provided with a control unit including a lever and a control valve for controlling the hydraulic cylinder.

  According to said structure, operation of a hydraulic cylinder can be performed immediately, piping to a hydraulic cylinder is easy, and conveyance of a connecting pin removal jig | tool is easy. Furthermore, if the hydraulic source is a construction machine, it is not necessary to prepare a new hydraulic source.

In a tenth invention, in any one of the third to ninth inventions,
The cylindrical member is
A lifting ring for lifting;
And a leg for mounting on the ground.

  According to said structure, a tension reaction force receiving member rotates easily in the state which lifted the cylindrical member. Moreover, since it is stabilized by a leg part when it puts on the ground, conveyance is easy. In addition, what is necessary is just to comprise a cylindrical member so that rotation with respect to a suspension ring is made possible with respect to a 1st coupling body with the cylindrical member.

  As described above, according to the first invention, at least the tensile reaction force receiving member is configured to be rotatable about the axial direction of the tubular member with respect to the first connection body, thereby providing the first connection body. Therefore, the locking member can be rotated to an optimum position to receive a tensile reaction force against the thrust of the hydraulic cylinder. For this reason, the connection pin of different outer diameter can be attached or detached with one connection pin attaching / detaching jig.

  According to the second aspect of the present invention, the connecting member is provided at the tip of the rod of the hydraulic cylinder at least about the axial direction of the rod, and the connecting pin is connected to the connecting member. The connecting member can be connected to the connecting pin very easily as compared with the one fixed to the rod.

  According to the third aspect of the present invention, since the connecting pin is inserted and removed from the distal end side of the connecting pin having the flange on the proximal end side, the restriction on the shape of the cylindrical member is reduced, and one tube The connecting / disconnecting operation of the connecting pins having different outer diameters can be performed only by the shaped member. Further, since the connecting pin can be pushed out when the rod having a large thrust is extended, the connecting pin can be easily detached.

  According to the fourth aspect of the present invention, since the tensile reaction force receiving member is rotatably attached to the outer periphery of the distal end of the cylindrical member, the piping of the hydraulic cylinder is not twisted while the cylindrical member is suspended. The positioning of the locking member and the locked portion of the first connector can be easily performed.

  According to the fifth aspect of the present invention, since the guide pipe having a slightly smaller outer diameter than the connecting pin can be connected to the tip of the rod of the hydraulic cylinder, the connecting pin has a different outer diameter while preventing damage to the hydraulic cylinder. However, desorption can be performed very easily.

  According to the sixth aspect, since the guide pipe can be easily guided to the pin hole by attaching the adapter to the tip of the guide pipe, the connecting pin can be detached and attached more easily.

  According to the seventh invention, the eyebolt fastened to the first connecting body is locked to the locking member, so that the portion for locking the locking member has a simple structure that can be easily attached and detached. And design changes such as attachments can be minimized.

  According to the eighth aspect of the invention, since the locking member is made of a flexible chain and a hook connected to the tip of the locking member, it is possible to flexibly cope with locked portions with different arrangements. As a result, it is possible to more efficiently remove the connecting pins having different outer diameters.

  According to the ninth aspect of the invention, by providing the control member for controlling the hydraulic cylinder in the cylindrical member, it is possible to obtain a connecting pin detaching jig that is easy to pipe, operate and carry.

  According to the tenth aspect of the present invention, by providing the tubular member with the hanging ring and the leg portion, an easy-to-handle connecting pin removal jig can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 6, a hydraulic excavator 1 as a construction machine according to an embodiment of the present invention includes a lower traveling body 2 and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. A main boom 4 is connected to the front portion 3a of the upper swing body 3 so as to be raised and lowered. The main boom 4 can be raised and lowered by a pair of right and left raising and lowering cylinders 5. By connecting various attachments to the main boom 4, the excavator 1 can be used for various purposes.

  In the present embodiment, a so-called separate boom is connected. That is, the front boom 6 is pin-coupled to the front end bracket 4a at the front end of the main boom 4 so as to be rotatable. The front boom 6 can be rotated by a jib cylinder 12 whose tube side is rotatably connected to the abdominal surface of the front boom 6 and whose rod side is rotatably connected to the abdominal surface of the main boom 4.

  An arm 7 is pin-connected to an end of the front boom 6 by an arm connecting pin 8. The arm 7 is rotatably connected to the rear surface of the front boom 6 by a pair of arm cylinders 9 having a piston rod 9 a connected to the base end of the arm 7.

  An arm top pin insertion hole 11 is formed at the tip of the arm 7. An arm top pin 13 can be inserted into the arm top pin insertion hole 11, and the bucket 10 is connected as a tip attachment by the arm top pin 13. One end of the bucket link 14 is connected to the proximal end of the bucket 10 by a bucket side link pin 14 a, and the other end of the bucket link 14 is connected to the tip of the arm 7. The bucket 10 can be rotated by a bucket cylinder 16 whose tube side is rotatably connected to the rear surface of the base end side of the arm 7 and whose rod side is connected to the bucket link 14 by a rod side link pin 15. The tip attachment is not limited to the bucket 10 and may be a crusher or the like.

  As shown in FIG. 5, a clevis 20 is provided at the tip of the piston rod 9 a of the arm cylinder 9. A spherical bearing 21 having a cylinder side pin insertion hole 21a as a pin hole at the center is provided in the through hole 20a of the clevis 20.

  On the base end side of the arm 7, a cylinder support portion 22 having an attach side pin insertion hole 22a as a pin hole is formed so as to protrude. Specifically, the cylinder support portion 22 has a central portion 22b and both end portions 22c standing with a gap between both ends of the central portion 22b, and the clevis 20 of each arm cylinder 9 is inserted into the two gaps. , So as to be pivotally supported. The center part 22b and the both end parts 22c each consist of a welded structure of a plurality of steel plates.

  A cylinder connecting pin 23 is inserted into the cylinder side pin insertion hole 21a and the attach side pin insertion hole 22a. A flange portion 23a for retaining and preventing rotation is welded to the base end side of the cylinder connecting pin 23, and the flange portion 23a is fastened to the cylinder support portion 22 while being pressed by the plate 27. On the base end side of the cylinder connecting pin 23, a pipe connecting screw hole 23b to which a distal end of a rod-like member 52b described later can be fastened is formed.

  The cylinder support portion 22 is configured to be able to connect a pair of arm cylinders 9 with a single cylinder connection pin 23. An anti-rotation member 24 is inserted between the inner surface of the cylinder support portion 22 and the outer surface of the spherical bearing 21 so as to sandwich the clevis 20 from both sides.

  When the connecting pins for connecting the attachments to each other or the attachment and the hydraulic cylinder that drives the attachment are inserted and removed, a connecting pin attaching / detaching jig 40 is used. In the present embodiment, the following case will be described as an example, but the connecting pin removing jig 40 can be used for any connecting pin.

  As described above, the cylinder connection pin 23 as a connection pin is connected to the attach side pin insertion hole 22a of the cylinder support portion 22 as the first connection body and the cylinder side pin insertion hole 21a of the arm cylinder 9 as the second connection body. Has been inserted. In the present embodiment, a case where the cylinder connecting pin 23 is inserted and removed will be described.

  As shown in FIGS. 1 to 4, the connecting pin attaching / detaching jig 40 includes a hydraulic cylinder 41 that moves the cylinder connecting pin 23 in the axial direction. The distal end of the tube 41 a of the hydraulic cylinder 41 is supported in a state of being coupled to the proximal end side of the cylindrical tubular member 42. The rod 41 b of the hydraulic cylinder 41 is configured to go back and forth inside the cylindrical member 42. An annular contact portion 42 a is formed at the tip of the cylindrical member 42. The abutting portion 42 a can abut on the peripheral edge of the attach-side pin insertion hole 22 a of the cylinder support portion 22.

  A tensile reaction force receiving member 43 is attached to the base end side of the abutting portion 42a of the cylindrical member 42. The tensile reaction force receiving member 43 has a pair of members having a semicircular cross section having an inner diameter slightly larger than the outer periphery of the cylindrical member 42 and having a flange formed thereon. The tensile reaction force receiving member 43 is rotatably attached to the outer periphery of the distal end of the cylindrical member 42 by tightening these members with the bolt 43a in a state where the outer peripheral surface of the cylindrical member 42 is fitted. By coming into contact with the rear surface of the contact portion 42a, it can be prevented from coming off and can support a tensile reaction force.

  On the other hand, as shown in FIG. 5, an eyebolt 44 as a locked portion can be attached in the vicinity of the attach-side pin insertion hole 22 a in the cylinder support portion 22. That is, a pair of tapped blocks 60 having screw holes 60 a are welded to the periphery of the attach side pin insertion hole 22 a, and the eyebolt 44 can be attached to the tapped block 60. The tapped block 60 is provided on the cylinder support portion 22 on the side opposite to the flange portion 23 a of the cylinder connecting pin 23.

  As shown in FIG.1 and FIG.2, the base end side of a pair of chain 45a as the latching member 45 is connected with the said tensile reaction force receiving member 43 rotatably. A hook-like hook 45b is connected to the tip of each chain 45a. The hook 45b is locked to the eyebolt 44.

  As shown in FIGS. 3 and 4, flange portions 46 are formed at the intermediate portion and the base end of the cylindrical member 42. At the upper end of the flange portion 46, a suspension ring 46a for lifting the whole connecting pin attaching / detaching jig 40 is formed. A bent plate-like leg portion 46b is formed at the lower end of the flange portion 46, and supports the entire connecting pin removing jig 40 when placed on the ground. Thus, since it stabilizes by the leg part 46b when it puts on the ground, conveyance is easy.

  A control unit 55 including a lever 47 and a control valve 48 for controlling the hydraulic cylinder 41 is provided above the intermediate portion of the cylindrical member 42. The control unit 55 includes a case 56 in which the lever 47 and the control valve 48 are built. A pipe 49 is connected from the control valve 48 to the hydraulic cylinder 41, and a pipe 49 can be connected from a hydraulic pump (not shown) of the excavator 1. Thus, the operation of the hydraulic cylinder 41 can be performed in the immediate vicinity, the piping to the hydraulic cylinder 41 is easy, and the connection pin detachment jig 40 can be easily transported. Furthermore, if the hydraulic source is the excavator 1, it is not necessary to prepare a new hydraulic source.

  As shown in FIGS. 1 and 2, a cylinder protection pipe 50 having the same diameter as that of the tubular member 42 is connected to the flange portion 46 on the rear side of the tubular member 42. By fixing the intermediate portion of the tube 41a of the hydraulic cylinder 41 to the rear end of the cylinder protection pipe 50, the hydraulic cylinder protruding from the base end of the cylindrical member 42 is protected. A rear end flange 50 a having leg portions 46 b is provided at the rear end of the cylinder protection pipe 50 in the same manner as the flange portion 46.

  As shown in FIG. 4, a connecting member 51 is connected to the tip of the rod 41 b of the hydraulic cylinder 41. The connecting member 51 is connected to the rod 41b so as to be rotatable about its axial direction. The connecting member 51 slides on the inner surface of the cylindrical member 42, so that the rod 41b moves back and forth within the cylindrical member 42 stably. A connecting hole 51a is formed at the distal end of the connecting member 51, and a guide pipe 52 having a slightly smaller outer diameter than the cylinder connecting pin 23 can be connected to the connecting hole 51a. A plurality of guide pipes 52 are prepared according to the outer diameter of the connecting pin, and all of them can be connected to the connecting member 51.

  As shown in FIGS. 7 to 13, the guide pipe 52 is closed at the front end and the rear end by a disc 52 a, and a rod-like member 52 b is inserted and fixed to both discs 52 a. An adapter 53 that is tapered toward the tip is detachably provided at the tip screw portion of the rod-shaped member 52b. The distal end of the rod-shaped member 52 b can be fastened to the pipe connection screw hole 23 b on the proximal end side of the cylinder connection pin 23 with the adapter 53 removed. A pipe eye bolt 52c is fastened to the rear end of the rod-shaped member 52b. By inserting the pipe connecting pin 54 into the pipe eye bolt 52c and the connecting hole 51a of the connecting member 51, the guide pipe 52 adapted to the pin hole can be connected to the tip of the rod 41b. The connecting member 51 is swingably connected to the guide pipe 52 around the pipe connecting pin 54. For this reason, the guide pipe 52 and the connecting member 51 can be connected even if the cylinder connecting pin 23 and the shaft center of the connecting pin removing jig 40 are not perfectly aligned, and the operation is easy. Become. Thus, the connecting member 51 has two degrees of freedom with respect to the guide pipe 52 (cylinder connecting pin 23).

-How to use the connecting pin removal jig 40-
Next, the usage method of the connection pin removal | desorption jig | tool 40 concerning this embodiment is demonstrated.

  First, the pin extracting operation for extracting the cylinder connecting pin 23 will be described with reference to FIGS. For simplification, the control unit 55, the piping 49, etc. are not shown.

  As shown in FIG. 7, the cylinder connecting pin 23 is inserted into the cylinder side pin insertion hole 21a and the attach side pin insertion hole 22a with the clevis 20 sandwiched between the rotation prevention members 24 inserted into the cylinder support portion 22. ing.

  First, a pipe 49 from a hydraulic pump (not shown) of the excavator 1 is connected to the control valve 48.

  Next, the eyebolt 44 is fastened to the tapped block 60. Thus, since the eyebolt 44 only needs to be fastened when the cylinder connecting pin 23 is inserted and removed, the eyebolt 44 does not get in the way during normal operation or the like, and the screw hole 60a or screw is not provided on the cylinder support portion 22 side. Since the eyebolt 44 can be attached simply by providing the tapped block 60 having the hole 60a, the structure is simple, and the increase in the mass of the cylinder support portion 22 is also minimized.

  Next, a guide pipe 52 slightly smaller than the outer diameter of the cylinder connecting pin 23 is prepared, and the tip of the rod-like member 52b of the guide pipe 52 is fastened to the pipe connecting screw hole 23b on the tip end side of the cylinder connecting pin 23.

  Next, the connecting member 51 is rotated about the axial direction and aligned with the pipe eyebolt 52c. Thus, since the connecting member 51 rotates freely with respect to the rod 41b, the connecting operation is easy.

  Next, the guide pipe 52 is connected to the connecting member 51 at the tip of the rod 41 b by the pipe connecting pin 54. Thus, since the guide pipe 52 can be replaced with respect to the tip of the rod 41b, the guide pipe 52 is replaced in correspondence with the attach side pin insertion hole 22a. By doing so, if only a plurality of guide pipes 52 are prepared in accordance with the outer diameter of the cylinder connecting pin 23, it is possible to select one having a slightly smaller outer diameter than the cylinder connecting pin 23 to be inserted and removed. . Further, by providing a slight margin for the outer diameter of the guide pipe 52 with respect to the attach-side pin insertion hole 22a, the guide pipe 52 can be easily inserted and removed even if the attach-side pin insertion hole 22a is slightly deviated. .

  At this time, since only the tensile reaction force receiving member 43 rotates in the state where the cylindrical member 42 is lifted, only the tensile reaction force receiving member 43 is rotated to align the locking member 45 and the eyebolt 44, As shown in FIG. 8, the hook 45 b is connected to the eyebolt 44. For this reason, the cylindrical member 42 is easily lifted and positioned, and the piping of the hydraulic cylinder 41 is not twisted. Thus, although the arrangement of the eyebolt 44 differs depending on the connecting pin of the attachment, the tensile reaction force receiving member 43 can be rotated in accordance with the eyebolt 44, so that the eyebolt 44 with a different arrangement can be locked at an optimum position. The member 45 is rotated and locked to the eyebolt 44. Further, since the chain 45a can be twisted or bent while the hook 45b is hooked on the eyebolt 44, it is easy to cope with the arrangement of different eyebolts 44.

  Next, after removing the plate 27 that holds the flange 23a, the lever 47 is operated to extend the rod 41b of the hydraulic cylinder 41 while receiving the tensile reaction force while the locking member 45 is locked to the eyebolt 44. .

  Then, as shown in FIG. 9, the cylinder connection pin 23 is pushed out from the attach side pin insertion hole 22a by the guide pipe 52 connected to the tip of the rod 41b. For this reason, even if the rod 41b does not enter the attach-side pin insertion hole 22a and the cylinder-side pin insertion hole 21a and the attach-side pin insertion hole 22a are misaligned, the hydraulic cylinder 41 is not damaged. Further, since the cylinder connecting pin 23 is pushed out when the rod 41b having a large thrust is extended, the cylinder connecting pin 23 requiring a larger force can be easily pulled out.

  Finally, the cylinder connecting pin 23 is removed from the guide pipe 52, and the guide cylinder 52 is shortened by shortening the hydraulic cylinder 41 while the contact portion 42a of the cylindrical member 42 is in contact with the peripheral edge of the attach-side pin insertion hole 22a. Extract. This completes the operation of extracting the cylinder connecting pin 23.

  Next, a pin insertion operation for inserting the cylinder connecting pin 23 will be described with reference to FIGS. 10 to 13.

  First, as shown in FIG. 10, a guide pipe 52 having an adapter 53 fastened to the tip is connected to the tip of the rod 41b by a pipe connecting pin 54, and the rod 41b of the hydraulic cylinder 41 is shortened and drawn into the cylindrical member 42. deep.

  Next, the hook 45 b is locked to the eyebolt 44 in the same manner as the above pinning operation. Then, as shown in FIG. 11, the lever 47 is operated to extend the rod 41b, and the guide pipe 52 is inserted into the attach-side pin insertion hole 22a and the cylinder-side pin insertion hole 21a. At this time, since the guide pipe 52 is guided to the attach-side pin insertion hole 22a and the cylinder-side pin insertion hole 21a by the adapter 53, even if the two arm cylinders 9 are connected, the guide pipe 52 Insertion is easy.

  Next, the adapter 53 is removed from the tip of the guide pipe 52, and as shown in FIG. 12, the cylinder connecting pin 23 is fastened instead, the hook 45b is removed from the eyebolt 44, and the eyebolt 44 is removed.

  Next, the rod 41b of the hydraulic cylinder 41 is shortened and the cylinder connecting pin 23 is pulled in while the compression reaction force is received while the contact portion 42a of the cylindrical member 42 is in contact with the peripheral edge of the attach-side pin insertion hole 22a. . As a result, as shown in FIG. 13, the cylinder connecting pin 23 is inserted into the attach side pin insertion hole 22a and the cylinder side pin insertion hole 21a. At this time, it is not always necessary to pull the cylinder connecting pin 23 into the cylindrical member 42, but even when the guide pipe 52 enters the cylindrical member 42, the inner diameter of the cylindrical member 42 is set to the maximum outer diameter. If it is made larger than the guide pipe 52, all the connecting pins can be inserted and removed with one cylindrical member.

  Next, the flange portion 23 a is fastened to the cylinder support portion 22 while being pressed by the plate 27.

  Finally, by removing the guide pipe 52 from the cylinder connecting pin 23, the pin insertion work is completed.

  In this way, even the cylinder connecting pin 23 having the flange portion 23a is inserted and removed from the distal end side thereof, so that the flange portion 23a of the cylinder connecting pin 23 supports the inside of the cylindrical member 42 that supports the hydraulic cylinder 41. Therefore, it is not necessary to enlarge the cylindrical member 42 in accordance with the flange 23a or to provide a notch.

-Effect of Embodiment 1-
Therefore, according to the connecting pin detaching jig 40 according to the present embodiment, the tensile reaction force receiving member 43 is configured to be rotatable about the axial direction of the cylindrical member with respect to the eyebolt 44, thereby Thus, the locking member 45 can be rotated to an optimal position, and a tensile reaction force against the thrust of the hydraulic cylinder 41 can be received. For this reason, the cylinder connecting pin 23 having different outer diameters can be attached and detached with one connecting pin attaching / detaching jig 40.

  According to the above-described embodiment, the connecting member 51 that can rotate at least around the axial direction of the rod 41 b is provided at the tip of the rod 41 b of the hydraulic cylinder 41, and the guide pipe 52 is connected to the connecting member 51. The connecting member 51 can be connected to the guide pipe 52 very easily as compared with the connecting member 51 fixed to the rod 41b.

  According to the above embodiment, since the cylinder connecting pin 23 is inserted and removed from the distal end side of the cylinder connecting pin 23 having the flange 23a on the base end side, the restriction on the shape of the cylindrical member 42 is reduced. The cylinder connecting pin 23 having different outer diameters can be attached and detached with only one cylindrical member 42. Further, since the cylinder connecting pin 23 can be pushed out when the rod 41b having a large thrust is extended, the cylinder connecting pin 23 can be easily attached and detached.

  According to the above-described embodiment, the tensile reaction force receiving member 43 is rotatably attached to the outer periphery of the distal end of the cylindrical member 42, so that the pipe 49 of the hydraulic cylinder 41 is twisted while the cylindrical member 42 is suspended. Therefore, the positioning of the locking member 45 and the eyebolt 44 can be easily performed.

  According to the above embodiment, the guide pipe 52 having a slightly smaller outer diameter than the cylinder connecting pin 23 can be connected to the tip of the rod 41b of the hydraulic cylinder 41, so that the outer diameter is different while preventing damage to the hydraulic cylinder 41. Even the cylinder connecting pin 23 can be attached and detached very easily.

  According to the above embodiment, the adapter 53 is attached to the tip of the guide pipe 52, so that the guide pipe 52 can be easily guided to the attach-side pin insertion hole 22a and the cylinder-side pin insertion hole 21a. In addition, the cylinder connecting pin 23 can be attached and detached.

  According to the above embodiment, the eyebolt 44 fastened to the cylinder support portion 22 is locked to the locking member 45, so that the locked portion can be easily attached and detached, Design changes such as attachments can be minimized.

  According to the above embodiment, since the locking member 45 is composed of the flexible chain 45a and the hook 45b connected to the tip thereof, it is possible to flexibly cope with differently arranged eyebolts 44. Therefore, the cylinder connecting pins 23 having different outer diameters can be attached and detached more efficiently.

  According to the above embodiment, by providing the cylindrical member 42 with the control unit 55 that controls the hydraulic cylinder 41, the connecting pin detaching jig 40 that is easy to pipe, operate, and carry is obtained.

  According to the above-described embodiment, by providing the tubular member 42 with the suspension ring 46a and the leg portion 46b, the easy-to-handle connecting pin removal jig 40 is obtained.

(Embodiment 2)
14 to 16 show a connecting pin attaching / detaching jig 140 according to Embodiment 2 of the present invention. The difference from Embodiment 1 is that the connecting pin is inserted and removed mainly from the flange side of the connecting pin. In the following embodiments, the same portions as those in FIGS. 1 to 13 are denoted by the same reference numerals, and detailed description thereof is omitted.

  That is, in Embodiment 1 described above, the tensile reaction force receiving member 43 alone can be rotated, but in this embodiment, the entire cylindrical member 142 is rotatable as shown in FIG. The cylindrical member 142 is configured to be rotatable with respect to the flange portion 146 (the suspension ring 146a).

  In this embodiment, as shown in FIGS. 17 and 18, an arm connecting pin 8 that connects the rear end of the arm 7 and the front boom 6 will be described. The arm connection pin 8 is inserted through an arm connection pin insertion hole 6a (pin hole) of the front boom 6 as a first connection body and an arm side insertion hole 7a of the arm 7 as a second connection body. A screw hole 60a for fastening the eyebolt 44 is provided in the vicinity of the arm connecting pin insertion hole 6a. The arm connecting pin 8 has a flange portion 8a on the base end side, and a pin connecting screw hole 8b at the center thereof.

  As in the first embodiment, the connecting member 51 is connected to the rod 41b so as to be rotatable about its axial direction. As shown in FIG. 19, a pin connecting eye bolt 152c fastened to the pin connecting screw hole 8b is directly connected to the connecting member 51 at the tip of the rod 41b. The connecting member 51 is swingably connected to the arm connecting pin 8 around the pin connecting pin 154. For this reason, even if the arm connecting pin 8 and the shaft center of the connecting pin detaching jig 140 are not completely positioned on a straight line, they can be connected to each other, and the work is facilitated. As described above, the connecting member 51 has two degrees of freedom with respect to the arm connecting pin 8.

  The tensile reaction force receiving member 143 of this embodiment is welded to the tip of the cylindrical member 142. The locking member 145 is composed of a plate-like member whose base end side is rotatably connected to the tensile reaction force receiving member 143 and whose distal end side can be connected to the eyebolt 44.

  A contact portion 142a is formed at the distal end of the cylindrical member 142, and an opening 142b is formed on the upper side thereof toward the proximal end side. As a result, the flange portion 8 a of the arm connecting pin 8 can pass through the cylindrical member 142.

  The use method of the connecting pin detaching jig 140 of this embodiment will be briefly described. Unlike the first embodiment, the arm connecting pin 8 is directly inserted and removed without using the guide pipe 52.

  That is, when inserting the arm connecting pin 8, as shown in FIG. 15, the arm connecting pin 8 is placed in the cylindrical member 142 and is brought close to the arm connecting pin insertion hole 6 a, as shown in FIG. 16. The cylindrical member 142 is rotated about its axial direction, and the locking member 145 is positioned and connected to the eyebolt 44. As shown in FIG. The connecting pin 8 is inserted into the arm connecting pin insertion hole 6a. Next, after removing the pin connecting pin 154, the flange portion 8a is fixed, and the pin connecting eye bolt 152c is removed.

  On the other hand, when pulling out the arm connecting pin 8, the pin connecting eyebolt 152c is fastened to the pin connecting screw hole 8b of the arm connecting pin 8, and the connecting member 51 is moved close to it and rotated around its axial direction. The pin connection pin 154 is connected to the pin connection eyebolt 152c. Then, the rod 41b is contracted while the abutting portion 142a of the tubular member 142 is brought into contact with the peripheral edge of the arm connecting pin insertion hole 6a, and the arm connecting pin 8 is drawn into the tubular member 142 as shown in FIG. Then, the arm connecting pin 8 is extracted. At this time, if the arm connecting pin 8 is rotated in the axial direction to align the flange portion 8a with the opening 142b, the flange portion 8a does not collide with the cylindrical member 142.

  Therefore, the connecting pin detachment jig 40 according to the present embodiment can also rotate the entire cylindrical member 142 so that the locking member 145 can be positioned on the eyebolt 44, so that the optimum position with respect to the eyebolt 44 is achieved. Since the locking member 45 can be rotated and the tensile reaction force against the thrust of the hydraulic cylinder 41 can be received, the connecting pins with different outer diameters can be attached and detached with one connecting pin attaching / detaching jig 140.

  According to the above-described embodiment, the connecting member 51 that is rotatable about at least the axial direction of the rod 41b is provided at the tip of the rod 41b of the hydraulic cylinder 41, and the arm connecting pin 8 is connected to the connecting member 51. Thus, the connecting member 51 can be connected to the arm connecting pin 8 very easily as compared with the connecting member 51 fixed to the rod 41b.

  In addition, although the locking member 145 was comprised with the plate-shaped member, it is good also as what consists of the chain 45a and the hook 45b similarly to the said Embodiment 1. FIG.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, the locking members 45 and 145 may be directly locked to the first connector instead of the eyebolt 44.

  Further, as described above, the connecting pin is not limited to the cylinder connecting pin 23 or the arm connecting pin 8, and the present invention is applied to a connecting pin that connects the attachments to each other or the attachment and a hydraulic cylinder that drives the attachment. be able to.

  Moreover, in the said embodiment, although the example of the hydraulic shovel was shown as a construction machine, a crane and a civil engineering machine may be used.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

It is a side view of the connection pin removal jig concerning Embodiment 1 of the present invention. It is a top view of a connection pin removal jig. It is the III-III sectional view taken on the line of FIG. It is side sectional drawing which expands and shows the front end side of a connection pin removal | desorption jig | tool. It is sectional drawing which shows a mode that the cylinder connection pin connected the arm cylinder. It is a side view showing the whole hydraulic excavator. It is sectional drawing which shows 1 process of a pinning operation | work. It is sectional drawing which shows 1 process of a pinning operation | work. It is sectional drawing which shows 1 process of a pinning operation | work. It is sectional drawing which shows 1 process of a pin insertion operation | work. It is sectional drawing which shows 1 process of a pin insertion operation | work. It is sectional drawing which shows 1 process of a pin insertion operation | work. It is sectional drawing which shows 1 process of a pin insertion operation | work. It is a top view of the connection pin removal tool concerning Embodiment 2 of the present invention. It is a side view which shows a partially broken connection pin detachment jig showing a state in which an arm top pin is extracted. FIG. 16 is a cross-sectional view taken along the line XVI-XVI of FIG. It is a side view of an arm top. It is the XVIII-XVIII sectional view taken on the line of FIG. It is sectional drawing which looked at one process of the insertion / extraction operation | work of a pin from the side.

Explanation of symbols

1 Excavator (construction machine)
6 Front boom (first connected body)
7 Arm (second connected body)
8 Arm connection pin (connection pin)
8a collar 9 arm cylinder (second connected body)
9a Piston rod 21a Cylinder side pin insertion hole (pin hole)
22 Cylinder support (first connected body)
22a Attached side pin insertion hole (pin hole)
23 Cylinder connection pin (connection pin)
23a Hook 40 Connecting Pin Detachment Jig 41 Hydraulic Cylinder 42 Tubular Member 42a Abutting Part 43 Tensile Reaction Force Member 44 Eye Bolt 45 Locking Member 45a Chain 45b Hook 46a Hanging Ring 46b Leg 47 Lever 48 Control Valve 51 Connection Member 52 Guide pipe 53 Adapter 55 Control unit 60 Tapped block 60a Screw hole 140 Connecting pin removal jig 142 Cylindrical member 142a Abutting portion 143 Tensile reaction force receiving member 145 Locking member 146a Suspension ring

Claims (10)

A connection pin detachment jig that is inserted into a pin hole provided in each of the first connection body and the second connection body of the construction machine and inserts and removes a connection pin that connects the first and second connection bodies,
A hydraulic cylinder for moving the connecting pin in the axial direction;
A tubular member in which the tube of the hydraulic cylinder is supported on the base end side, and the rod of the hydraulic cylinder goes back and forth inside, and the tip can be brought into contact with the peripheral edge of the pin hole of the first connecting body;
A tensile reaction force receiving member attached to the distal end side of the cylindrical member and receiving a tensile reaction force applied to the cylindrical member;
A proximal end side is coupled to the tensile reaction force receiving member, and a distal end side is latched to the first coupling body;
A connecting pin attaching / detaching jig, wherein at least the tensile reaction force receiving member is configured to be rotatable about the axial direction of the cylindrical member with respect to the first connecting body. In the connecting pin detaching jig according to claim 1,
A connecting pin attaching / detaching jig characterized in that a connecting member capable of rotating at least about the axial direction of the rod is provided at the tip of the rod of the hydraulic cylinder. In the connection pin detachment jig according to claim 1 or 2,
On the base end side of the connecting pin, a collar is formed,
The engagement pin detachment jig, wherein the engagement member is engaged with a side opposite to the flange portion of the connection pin in the first connection body. In the connecting pin detaching jig according to any one of claims 1 to 3,
The connecting pin attaching / detaching jig, wherein the tensile reaction force receiving member is attached to an outer periphery of a distal end of the cylindrical member so as to be rotatable in an axial direction of the cylindrical member. In the connection pin removal jig according to any one of claims 1 to 4,
A connecting pin attaching / detaching jig, wherein a guide pipe having a slightly smaller outer diameter than the connecting pin is connectable to a tip end side of the rod of the hydraulic cylinder. In the connection pin removal jig according to claim 4 or 5,
An adapter for attaching and detaching a connecting pin, wherein an adapter that narrows toward the tip is attached to the tip of the guide pipe. In the connecting pin detaching jig according to any one of claims 1 to 6,
The connecting pin attaching / detaching jig, wherein the locking member is locked to an eyebolt fastened to the first connecting body. In the connection pin detachment jig according to any one of claims 1 to 7,
The engagement pin detachment jig is characterized in that the locking member comprises a chain and a hook connected to the tip of the chain. In the connection pin removal jig according to any one of claims 1 to 8,
A connecting pin attaching / detaching jig, wherein the cylindrical member is provided with a control unit including a lever and a control valve for controlling the hydraulic cylinder. In the connection pin detachment jig according to any one of claims 1 to 9,
The cylindrical member is
A lifting ring for lifting;
A connecting pin detaching jig comprising a leg for placing on the ground.

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