JPH0372121A - Device for attaching/detaching working tool of boom type working machine - Google Patents

Abstract

PURPOSE:To facilitate attaching/detaching work of a backet by providing a fixing pin on a mounting bracket in such a manner as to be freely moved, the fixing pin being freely engaged in an engagement portion provided in a link plate, and releasing the locked state of the fixing pin when connecting shaft portions are fitted with respective fitting portions. CONSTITUTION:A pair of right and left mounting brackets 37 provided on the reverse face side of a backet 13 are provided with an upper fitting portion 41 to be fitted with an upper side connecting shaft portion 31 and a lower fitting portion 42 to be fitted with a lower side connecting shaft portion 30. A fixing device 44 comprising a fixing pin 45 and an engagement portion 46 provided on the side of a link plate 24 is provided on the reverse face of the backet 13. To detach the backet 13, an operating portion 55 is raised against a pressing spring 54 and a pin 45 is detached from the engagement portion 46 and the vehicle body is retreated so that the shaft portion 31 is detached. To attach the backet 13, the pin 45 is retreated in a connection-awaiting position, and the shaft portions 31, 30 are fitted with the respective fitting portions 41, 42 and the pin 45 is released and engaged in the engagement portion 46.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a work implement attachment/detachment device for a boom type work machine such as a front loader.

(Prior Art) Conventionally, there is a front loader, for example, as a boom-type working machine mounted on a traveling vehicle body such as a tractor. It is equipped with a pair of left and right booms that are pivotally connected to the top and a packet serving as a working tool that is connected to the tips of both booms, and a boom cylinder that swings the boom up and down is provided between the boom and the mast. A packet cylinder for rotating the packet is provided between the boom and the packet.

A pair of left and right mounting brackets are provided on the back side of the packet, and each mounting bracket is provided with a pair of left and right connecting plates. A pair of upper and lower pin insertion holes are formed in each of the left and right connecting plates, and the end of the packet cylinder and the tip of the boom are inserted between the reconnecting plates, and each upper pin insertion hole and the end of the packet cylinder are inserted between the reconnecting plates. The packet can be attached and detached by making the upper stop pin penetrating through the lower part and removably attaching it, and by making the lower pin insertion hole and the boom tip part pass through and attaching and detaching the lower retaining pin. It was designed to be installed. For example, it is disclosed in Japanese Utility Model Application No. 87250/1983.

(Problem to be Solved by the Invention) However, according to the above-mentioned packet attachment/detachment structure, when replacing the packet or replacing it with another work tool such as a fork, a total of four It is necessary to remove the retaining pin, and when installing it, match the end of the cylinder with each pin insertion hole of the connecting plate, and the tip of the boom with each pin insertion hole of the connecting plate at a total of 4 locations. It was necessary to attach a stopper pin9, making attachment and detachment work troublesome.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a device that facilitates the attachment and detachment of work tools such as packets.

(Means for solving the problem) The technical means is that a pair of left and right booms are supported on the traveling vehicle body side by boom cylinders so as to be able to swing up and down, and one end of a work tool cylinder is pivotally supported on each boom. Along with being
The other end of the cylinder and the tip of the boom are removably connected to a pair of left and right mounting brackets provided on the back side of the work implement, separated vertically, and the work implement is rotated by expansion and contraction of the work implement cylinder. In a movable device, the tip of each boom and the other end of each work implement cylinder are each
In addition to being connected by a link plate, a connecting shaft portion is provided at the tip of the boom and the other end of the work implement cylinder that protrudes to both sides in the left and right direction, and the upper connecting shaft portion is integrated on the left and right sides, and each mounting bracket is It is equipped with a pair of left and right connecting plates, and the upper part of each connecting plate has a rear-open guide part that guides the upper connecting shaft part upward, and a guide part that is located at the upper end of the guide part and into which the connecting shaft part is fitted from below. A dohyo mating part having a fitting recess that can be removably fitted is provided at the lower part of each connecting plate, and the lower connecting shaft part is disposed rearwardly when the fitting recess and the connecting shaft part are fitted together. A lower fitting part is provided which is removably fitted to the lower fitting part, and when each connecting shaft part and each fitting part are fitted, the fixing part is removably engaged with a temporarily provided retaining part of the link. A connection in which a pin is provided on a mounting bracket so as to be movable in an axial direction, a biasing spring is provided for biasing the fixed pin in the engagement direction, and the fixed pin is retracted from the engagement position against the biasing spring. A locking part that locks in the ready position is provided, and when each connecting shaft part and each fitting part are fitted,
A release operation part for releasing the locking state of the fixing pin is provided on the link plate.

(Function) According to the present invention, when removing the working tool 13, the boom 9 is lowered to lower the working tool 13 to the ground, and in this state, the fixing pin 45 is disengaged from the engaging portion 46, and the lower fitting is performed. The connecting shaft portion 30 below the joining portion 42 is removed, and the dohyo joining portion 41 is removed.
It is only necessary to remove the upper connecting shaft portion 31.

Next, when attaching the work tool 13, the fixing pin 45 is retracted to the connection preparation position against the urging force of the urging spring 54 and is locked in the locking part 56, and the upper connecting shaft part 31 is fixed to the ring. Place it on the guide part 39 of the joining part 41, and under the guidance of the guide part 39,
By fitting the fixing pin 45 into the fitting recess 40 and then fitting the lower connecting shaft portion 30 into the lower fitting portion 42, the locking state of the fixing pin 45 with respect to the locking portion 56 is released by the release operation portion 63. The fixing pin 45 is moved in the axial direction by the biasing force of the biasing spring 54 and automatically engages with the retaining portion 46 in a detachable manner, thereby obtaining a locked state.

During this attachment/detachment operation, since the upper connecting shaft portions 31 are integrated on the left and right sides, the left and right booms 9, link plates 24, etc. move synchronously, and the attachment/detachment operation can be performed smoothly.

(Embodiment) Hereinafter, embodiments of the present invention will be described based on the drawings. In Figs. The engine 3 is covered with a bonnet 5.

8 is a front loader as a boom type work machine, and the vehicle body 1
a pair of left and right booms 9 located on both sides of the hood 5;
A pair of left and right mast elements 1 for vertically swingingly supporting each boom 9 via a pivot 10, a pair of left and right boom cylinders 12 for raising and lowering the boom 9, and a pair of left and right boom cylinders 12 connected to the front end of the boom 9. Packet 13 as a work tool and bucket bucket 3
A pair of left and right packet cylinder cylinders 4 serve as working tool cylinders for rotating the hood, and a pair of left and right braces protrude diagonally downward from the mast 1) and are provided in the front-rear direction along both sides of the bonnet 5. 15. Further, the front end portions of the left and right braces 15 are connected to each other by a connecting member 16.

Reference numeral 18 denotes a mounting bracket, which is provided in an outwardly projecting manner on the left and right sides of the tractor body l in the longitudinal direction. and are removably connected and fixed by a fixture (not shown) inserted and removably inserted across both.

The boom cylinder 12 is disposed below the boom 9 and between the boom 9 and the mast 1 ), and the packet cylinder 14 is disposed above the boom 9 between the boom 9 and the packet 13 .

Connecting pins 22 and 23 are provided in a penetrating manner in the tip end 20 of the boom 9 and the front end 21 of the packet cylinder 14 and having the pin insertion hole, respectively.
．． Link plates 24 are fitted to the protruding parts on both sides of 23, and collars 26 and 27 are attached, and retaining rings 28 and 29 are attached.
The collars 26 protruding on both sides are held in place by
．． 27 constitutes a connecting shaft portion 30.31. Here, each tip portion 20 and front end portion 21 are held at a predetermined distance from each other by each link plate 24. Note that this predetermined interval is configured to be the same on the left and right sides, and is the same as the conventional one.

In addition, the upper connecting pin 23 is welded to the vibe body 32.
The left and right sides are integrated. Furthermore, the upper portions of the front edges of each link plate 24 are bent inwardly, and the insertion guide portion 3
3.

A pair of left and right mounting brackets 37 are provided on the back side of the packet 13 in correspondence with each boom 9 and packet cylinder 14, and each mounting bracket 37 has a pair of left and right mounting brackets 37 facing each other with a predetermined interval. A connecting plate 38 is provided, and each connecting shaft portion 31 of the upper connecting pin 23 is provided on the upper part of each connecting plate 38.
The upper part has a rear-opening guide part 39 that guides the upper part upward, and a downwardly-opening fitting recess 40 located at the upper end of the guide part 39 and into which the connecting shaft part 31 is removably fitted from below. A fitting portion 41 is provided. Further, the lower part of each connecting plate 38 has a rear open shape into which the lower both side connecting shaft parts 30 are removably fitted from the rear when the fitting recess 40 and the connecting shaft part 31 are fitted together. A lower fitting portion 42 is provided.

Between the back of the packet 13 and the upper and lower connecting pins 22 and 23,
A fixing device 44 is provided to lock the connecting shaft portion 30.31 and each fitting portion 41.42 in the fitted state. and a retaining portion 46 provided on the link plate 24 side.

As shown in FIG. 1, the fixing pin 45 has an upper support plate 47 installed between the upper ends of the reconnection plate 38 and a pair of upper and lower middle supports installed between the lower ends of the reconnection plate 38. Board 4
8. Fitting holes 50, 51 formed in the lower support plate 49, respectively.
A pair of engagement blades 53 are fitted between the fixing pins 45 and protrude outward in the radial direction by welding or the like in the middle of the fixing pin 45, and are in contact with the upper surface of the middle support plate 48. It is locked. Further, a biasing spring 54 made of a coil spring is compressedly fitted between the upper support plate 47 and the engagement blade 53, and resiliently biases the fixing pin 45 downward via the engagement blade 53. . 58, the spring holder is a washer. An operating portion 55 bent approximately 90 degrees is provided at the upwardly projecting end of the fixing pin 45 . Here, the fixing pin 45 is made freely operable in the axial direction, that is, in the vertical direction along the back surface of the packet 13, by the operating portion 55 against the biasing force of the biasing spring 54. Furthermore, a fixing pin 4 is provided at a predetermined position between the upper support plate 47 and the middle support plate 48 on the negative side.
A locking portion 56 is provided in an overhanging manner to lock one of the engagement blades 53 when the blade 5 is rotated about the axis. Reference numeral 57 denotes a stopper that is brought into contact with the engagement blade 53 so as to be able to move toward and away from the engagement blade 53, and regulates the amount of rotation of the fixing pin 45. On the other hand, the retaining portion 46
is a connection plate 60 installed across the lower part of each link plate 24, each connection pin 22.23 provided in a forward protruding shape from the front surface of the connection plate 60, and each fitting part 41.42. In the assembled state, it comprises a protruding plate 61 located between the middle support body 4 and the lower support plate 49, and the fixing pin 45 is removably fitted into the position of the protruding plate 61 corresponding to the fixing pin 45. engagement hole 6
2 is provided. In addition, in one link plate 24, in order to release the locked state between the engaging blade 53 and the locking portion 56 in the above-mentioned fitted state, the other engaging blade 53 is pushed to release the fixing pin 45. A release operation section 63 that is rotated in the direction is provided in a forward-projecting shape.

Reference numeral 65 denotes a soil intrusion prevention plate, which is attached to the upper support plate 47 to prevent soil spilled from the packet 13 side from entering the mounting bracket 37.
It is provided on the rear end edge in an upwardly projecting manner.

The embodiment of the present invention is configured as described above, and when the packet 13 is to be removed, the operating section 55 is pulled up against the biasing spring 54, rotated at a predetermined position, and the engaging blade 53 is removed.
is placed on the release operation part 63 and locked.

In this state, the fixing pin 45 is disengaged from the engagement hole 62 of the engagement portion 46. and packet cylinder 14
When the vehicle body 1 is extended and the vehicle body 1 is moved backward, the connecting shaft portion 30 is detached from the lower joining portion 42, and when the boom 9 is further lowered and the vehicle body 1 is moved backward, the connecting shaft portion 31 is removed from the upper joining portion 41.

At this time, the fixing pin 45 is moved downward by the urging force of the urging spring 54.

Next, when attaching the bucket) 13, as shown in FIG. 6, the fixing pin 45 is pulled upward, the engagement blade 53 is engaged with the locking part 56, and the connection is prepared by retreating from the locking position. Hold it in position. When the vehicle body 1 is moved forward with the tip end 20 of the boom 9 and the front end 21 of the packet cylinder 14 lowered, the front end of the link plate 24 is inserted between the reconnection plates 38, and each packet cylinder 1
The connecting shaft portions 31 on both sides of the front end portion 21 of 4 are brought into contact with the guide portions 39 of the upper joint portion 41, respectively. When the link plate 24 is inserted between the reconnection plates 38, since the insertion guide portion 33 is provided, the link plate 24 is smoothly guided between the reconnection plates 38. Next, when the boom cylinder 12 is extended and the boom 9 is raised, the connecting shaft portion 31 is fitted into the fitting recess 40. In this state, if the packet cylinder 14 is shortened, a state is obtained in which the lower connecting shaft portion 30 is relatively fitted into the lower connecting portion 42.

At this time, the release operation part 63 pushes the engagement part m53 and rotates the fixing pin 45 in the release direction, and the engagement state between the engagement blade 53 and the engagement part 56 is released, and the fixing pin 45 is moved downward by the urging force of the urging spring 54, and as shown in FIG. A locked state is obtained. As described above, the packet 13 can be attached and detached by one-touch operation of the fixing pin 45, and unlike the conventional structure, the tip of the boom and the front end of the packet cylinder are connected individually and a total of four retaining pins are attached and detached. In comparison, attachment and detachment work is easier.

Further, the distal end portion 20 of the boom 9 and the front end portion 21 of the packet cylinder 14 are maintained at a predetermined distance by the link plate 24, and the fitting recess 40 and the connecting shaft portion 31 are connected under the guidance of the guide portion 39. It is a structure in which the lower fitting part 42 and the connecting shaft part 30 are fitted in the fitted state, and as in the conventional case,
This also makes the attachment/detachment work easier compared to the case where the tip of the boom or the front end of the packet cylinder is individually aligned with each pin insertion hole. Further upper connecting shaft portion 31
Since the left and right are integrated, each cylinder 12.1
The left and right sides move synchronously in conjunction with the expansion and contraction of 4, making attachment and detachment easy and smooth. If other working tools such as a fork are provided with a mounting bracket 37 having a similar structure, replacement work can be easily performed. In addition, the fixing device 44 is attached to the back of the packet 13 of the mounting bracket 37 and each connecting shaft portion 3.
This structure is provided by utilizing a dead space of 0.31 mm, does not protrude rearward, can be constructed compactly, and is protected by the reconnection plate 38, which has the advantage of being able to prevent damage.

Although the above embodiment shows a structure in which the upper connecting shaft portions 31 are integrally connected to each other by the vibrator body 32, it may be a connecting pin that is continuous on the left and right sides.

(Effects of the Invention) According to the present invention, the tip of each boom and the other end of each work implement cylinder are connected by a link plate, and the tip of the boom and the other end of the work implement cylinder are Connecting shaft parts are provided that protrude on both sides in the direction, and the upper connecting shaft part is integrated on the left and right sides, and each mounting bracket is provided with a pair of left and right connecting plates, and the upper connecting shaft part is attached to the top of each connecting plate. An upper fitting part is provided, which has a rear-open guide part that guides the parts upward, and a fitting recess, which is located at the upper end of the guide part and into which the connecting shaft part is removably fitted from below. At the bottom of the connecting plate,
A lower joint portion is provided in which the lower connecting shaft portion is removably fitted from the rear when the fitting recess and the connecting shaft portion are fitted together;
A fixing pin that removably engages with a retaining part provided on the link plate when each connecting shaft part and each fitting part are fitted is provided on the mounting bracket so as to be movable in the axial direction. A biasing spring that biases the fixing pin in the engagement direction is provided, and a locking portion that engages the fixing pin in a connection preparation position retracted from the engagement position against the biasing spring is provided. A release operation part is provided on the link plate to release the locked state of the fixing pin when the part and each fitting part are mated, and a one-touch operation by operating the fixing pin releases the work tool and the boom side. It is easy to attach and detach the connectors, and the alignment is smooth due to the engagement of each connecting shaft with each fitting part.Furthermore, since the upper connecting shaft is constructed as one piece, the left and right sides are synchronized. It moves smoothly, making attachment and detachment work smooth.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side sectional view of the main part;
Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view from Figure 1 ■.
4 is a cross-sectional view taken along the line IV--IV in FIG. 1, FIG. 5 is an overall side view, and FIG. 6 is a side view of main parts when installed. 1... Vehicle body, 8... Front loader, 9... Boom, 12... Boom cylinder, 13... Packet,
14... Packet cylinder, 24... Link board, 3
0...Connection shaft part, 31...Connection shaft part, 37...Mounting bracket, 38...Connection plate, 39...Guide part, 40...Fitting recess, 41...Top Fitting portion, 42...
・Lower region joining part, 45...fixing pin, 46...engaging part,
54...Biasing spring, 56...Locking part, 63...Release operation part. Patent applicant: Kubota Iron Works Co., Ltd.-12:

Claims (1)

[Claims] (1) On the traveling vehicle side, the boom cylinder swings up and down,
A pair of left and right booms are freely supported, one end of a work tool cylinder is pivotally supported on each boom, and the other end of the cylinder and the tip of the boom are connected to the left and right booms provided on the back side of the work tool. In a device in which the work implement is removably connected to a pair of mounting brackets, spaced apart vertically from each other, and is rotatable by the expansion and contraction of the work implement cylinder, the tip of each boom and the above-mentioned components of each work implement cylinder are The ends are connected by a link plate, and a connecting shaft portion is provided at the tip of the boom and the other end of the work tool cylinder, protruding to both sides in the left-right direction, and the upper connecting shaft portion is integrated into the left and right sides, Each mounting bracket is equipped with a pair of left and right connecting plates, and on the top of each connecting plate,
an upper fitting section having a rear-open guide section that guides the upper connecting shaft section upward; and a fitting recess that is located at the upper end of the guide section and into which the connecting shaft section is removably fitted from below. A lower fitting part is provided at the lower part of each connecting plate, into which the lower connecting shaft part is removably fitted from the rear when the fitting recess and the connecting shaft part are fitted together. A fixing pin is provided on the mounting bracket so as to be movable in the axial direction, and is movable in the axial direction, and is removably engaged with the engaging part provided on the link plate when each connecting shaft part and each fitting part are in the fitted state. A biasing spring that biases the pin in the engagement direction is provided, and a locking portion that engages the fixing pin in a connection preparation position retracted from the engagement position against the biasing spring is provided, and each connection A work implement attachment/detachment device for a boom-type work machine, characterized in that a link plate is provided with a release operation part for releasing the locking state of a fixing pin when a shaft part and each fitting part are fitted together.