WO2004027162A1

WO2004027162A1 - Attachment fixing/removing device

Info

Publication number: WO2004027162A1
Application number: PCT/JP2003/004436
Authority: WO
Inventors: Shuichi Hazama; Hiroyasu Nishikawa; Takahiro Iwamoto
Original assignee: Shin Caterpillar Mitsubishi Ltd.
Priority date: 2002-09-17
Filing date: 2003-04-08
Publication date: 2004-04-01
Also published as: JP2004107936A; AU2003221084A1

Abstract

An attachment fixing/removing device in which the position of an attachment with respect to a supporting member when the attachment is coupled with the supporting member through the fixing/removing device is kept the same as when the fixing/removing device is not used. The attachment fixing/removing device comprises a coupling pin (6) provided in the attachment (4), a coupling hook (9) provided in the supporting member (8) and engaging with the coupling pin (6) or disengaging therefrom freely, and a grasping hook (12) provided movably in the supporting member (8) in order to block uncoupling of the coupling pin (6) from the coupling hook (9), wherein the attachment is fixed to the same position as when the fixing/removing device is not used.

Description

Specification

Attachment attachment / detachment device

Technical field

The present invention relates to an attachment attachment / detachment device, and more particularly to an attachment attachment / detachment device used for detachably and quickly connecting an attachment such as a working tool or a working device to a support member such as a working arm of a working machine.

Background art

A typical work machine, for example, a hydraulic shovel, can perform various works by appropriately replacing attachments such as work tools and work devices attached to its work arms with different ones. For example, excavation and loading of earth and sand can be performed by installing a bucket, quarrying and road crushing work can be performed by installing a hydraulic breaker, and demolition of a structure can be performed by installing a crusher. . Therefore, if various attachments such as buckets, breakers, crushers, etc. are properly attached and detached and replaced, one hydraulic excavator can be used for multiple purposes and multiple functions. Therefore, for this type of working machine, an attachment attaching / detaching device for detachably and quickly connecting the attachment has been developed and put to practical use.

A typical attachment / detachment device will be described with reference to FIG. The attachment attachment / detachment device generally designated by reference numeral 50 includes a bracket 54 having a fixed hook 54a and a movable hook 54b, which is swingably connected to the tip of a working arm 52 as a support member. A pair of connecting pins 58a and 58b are provided on a bucket 58 as an attachment so as to engage with the fixed hook 54a and the movable hook 54b, respectively. The bracket 54 is provided with a hydraulic cylinder 56 for driving the movable hook 54 b, and a swing driving member 6 for swinging the bracket 54 around the tip of the work arm 52. 0-power connection.

In order to connect the bucket 58 to the working arm 52 by the attachment / detachment device 50, the movable hook 54b of the bracket 54 is driven by the hydraulic cylinder 56 to the fixed hook 54a side (two points). The distance between the movable hook 54b and the fixed hook 54a is reduced. First, one connecting pin 58a of the bucket 58 is engaged with the fixed hook 54a, and then the movable hook 54 Drive b in the direction away from the fixed hook 5 4 a to move the movable hook 5 4 b And the connecting pin 58b are engaged (the state shown by the solid line). To release the engagement, the movable hook 54b is driven by the hydraulic cylinder 56 in the direction of the fixed hook 54a (shown by a two-dot chain line). Then, the engagement between the fixing hook 54a and the connecting pin 58a is released. Thus, the bucket 58 is detachably and quickly connected to the work arm 52 as a support member via the attachment / detachment device 50.

Therefore, if the above-mentioned bracket 54 is provided on the work arm 52 as a support member and the connecting pins 58a and 58b are provided on various attachments, different attachments can be easily and easily attached to the work machine. It can be quickly attached and detached. When the bucket 58 is attached to or detached from the work arm 52 without using the attachment / detachment device 50, the connection pin 58a of the bucket 58 is swung to the tip of the work arm 52, and the connection pin 58b is swung. Pull out and attach to the leading end of the driving member 60 respectively.

Disclosure of the invention

However, the conventional attachment attachment / detachment device of the above-described embodiment has the following problems to be solved.

(1) Changing the working range of the attachment:

A bracket 54 with hooks 54a and 54b is interposed between the work arm 52 and the bucket 58, so the length L1 from the work arm 52 to the tip of the bucket 58 is attached and detached. The length L2 of the bracket 54 is longer than when the bucket 58 is directly attached to the work arm 52 without using the device 50, and the tip of the baguette 58 is moved by the movement of the work arm 52. The range of movement becomes larger. Therefore, the work may feel uncomfortable, and the attachment may easily interfere with the body of the working machine or surrounding structures.

(2) Change in attachment work force:

In addition, the distance L 1 from the work arm 52 to the tip of the bucket 58 becomes longer by L 2 of the bracket 54 than when the attaching / detaching device 50 is not used, so that the bucket 58 is driven to swing. When the swinging motion is made about the tip of the work arm 52 by the member 60, the tip force of the bucket 58 becomes far from the pivoting center, so that the excavating force at the tip of the bucket by the moving moment decreases. The work capacity of the work machine is reduced.

The present invention has been made in view of the above facts, and the technical problem is that the support member has It is an object of the present invention to provide an attachment attachment / detachment device capable of keeping the position of the attachment with respect to a support member when the attachment is connected via the attachment / detachment device unchanged from the case where the attachment / detachment device is not used.

In the present invention, as an attachment attaching / detaching device for removably attaching an attachment to a support member, which solves the above technical problem, a connection pin provided on the attachment, and a detachable engagement with the connection pin provided on the support member A connecting hook, and a holding hook movably provided on the support member for removably engaging the connecting pin connected to the connecting hook and preventing the connecting pin from being detached from the connecting hook. Attachment attachment / detachment device provided with one, two or more sets.

Then, a connection hook is provided on the support member to which the attachment is to be attached, and the connection pin of the attachment is engaged there, and the attachment is attached so that the connection pin is not detached from the connection hook by the holding hook. Conversely, remove the gripping hook from the connecting pin, detach the connecting pin from the connecting hook, and remove the attachment. By doing so, the position of the attachment with respect to the support member is kept the same as in the case where the attachment / detachment device is not used.

In a preferred embodiment, a cylindrical member rotatably fitted to the connecting pin is provided, and the connecting hook and the gripping hook are engaged with the connecting pin via the cylindrical member. Then, the attachment and the support member are rotatably connected by the tubular member. In a preferred embodiment, a guide means is provided between the support member and the holding hook for guiding the movement of the holding hook in the direction of engagement and disengagement with the connection pin.

The guiding means ensures that the gripping hook force << the connecting pin can be reliably gripped.

In a preferred embodiment, the hydraulic cylinder further includes a hydraulic cylinder connected to the gripping hook, the hydraulic cylinder includes an urging means for urging the gripping hook in a direction to engage the coupling pin, and The biasing means is built in the support member. In addition, the gripping hook can be easily disengaged from the connecting pin by the fluid pressure cylinder, and the gripping hook is always urged in the direction of the connecting pin by the urging means, so that the gripping hook can reliably grip the connecting pin. To do. In addition, a fluid pressure cylinder and And a biasing means built into the support member so that they will not be damaged by obstacles, etc., and that there is no malfunction in operation.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view showing a state in which a bucket as an attachment is attached to an arm as a support member and a drive link by an attachment attaching / detaching device configured according to the present invention.

Figure 2 is a perspective view of the baguette of Figure 1.

Fig. 3 is an enlarged view of A-A section in Fig. 2.

FIG. 4 is a side view showing the support member of FIG. 1 with a baguette removed. FIG. 5 is a plan view of the arm portion of the support member in the direction of arrows BB in FIG. FIG. 6 is an enlarged view of FIG. 5 as viewed in the direction of arrow C-C. FIG. (B) is a diagram in which the grip hook is detached from the connecting pin.

FIG. 7 is a diagram showing a part of the guide means of the connecting hook and the gripping hook when viewed in the direction of the arrows D—D in FIG.

Fig. 8 is a plan view of the drive link portion of the support member in the direction of arrows E-E in Fig. 1. FIG. 9 is a side view showing a state in which a bucket as an attachment by a conventional attachment attaching / detaching device is attached to an arm as a support member and a drive link.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the attachment attaching / detaching device configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment.

Referring to FIG. 1, the attachment attachment / detachment device, which is indicated by a reference numeral in its entirety, is a pair of connecting pins 6, 6 provided substantially parallel to a bucket 4 as an attachment, and a support member for supporting the bucket 4. Connecting hooks 9, 11 provided on each of the arm 8 and the driving link 10 for removably connecting to each of the connecting pins 6, 6, and connecting hooks 9, 1 1 provided on each of the arm 8 and the driving link 10 Gripping hook that engages with each of the connecting pins 6 and 6 (the state shown in FIG. 1) in a state where the connecting pins 6 and 6 are connected to the connecting hooks 9 and 11 in the engaged state. 1 2 and 1 3 are provided. The other end of the drive link 10 is rotatably connected to an intermediate link 16 that is swingably attached to the hydraulic cylinder 14 and the arm 8. The baguette 4 connected to the arm 8 and the drive link 10 via the attachment / detachment device 2 is oscillated by the hydraulic cylinder 14 connected to the drive link 10 around the tip of the arm 8.

The baguette 4 will be described with reference to FIGS. 2 and 3 together with FIG. At the top of the baguette 4, a pair of brackets 4a and 4b are erected at an interval in the width direction (perpendicular to the plane of FIG. 1). The bracket 4a has a pair of bearing bosses 4c and 4c, and the bracket 4b has a pair of bearing bosses 4d and 4d. d, and are mounted such that the connecting pins 6, 6 are substantially parallel. The connecting pin 6 is fixed to the bearing boss 4c or 4d by means such as a bolt (not shown). A sleeve 18 as a cylindrical member is rotatably fitted to each of the connecting pins 6.

The bucket 4 may be the same as a well-known bucket directly attached to a support member such as the arm 8 and the drive link 10 without using a detachable device except for the sleeve 18.

The sleeve 18 has a cylindrical shape, and its length is formed to be substantially the same as the installation inner width of the bearing boss 4c and the bearing boss 4d. The inner diameter of the sleeve 18 is finished to be rotatable around the outer circumference of the connecting pin 6, a lubricating oil reservoir 18a is formed in the center of the inner diameter in the longitudinal direction, and seals 18 are provided at both ends of the inner diameter. b is installed.

The connection hook 9 provided on the arm 8 will be described with reference to FIGS. The arm 8 extending straight is formed in a forked shape from the mounting portion of the above-mentioned intermediate link 16 to the leading end, and a connecting hook is provided at each leading end of the divided ends 8a and 8b across the forked space S. It is formed 9 strong. The connecting hook 9 is provided with a U-shaped cross-section engaging groove 9a which is detachably engaged with the outer diameter of the sleeve 18 of the connecting pin 6 provided in the bucket 4, and the engaging groove 9a is an arm. It is open in the direction (left direction in FIG. 4) substantially perpendicular to the extending direction of the 8.

A holding hook 12 and a hydraulic cylinder 20 which is a fluid pressure cylinder connected to the holding hook 12 are provided in a space S at the distal end of the arm 8. The gripping hooks 12 are attached to the tip of the rod 20a of the hydraulic cylinder 20, and the cylinder body 20b of the hydraulic cylinder 20 is attached to the pin 22 that attaches the intermediate link 16 to the arm 8. Have been.

This will be described with reference to FIG. 5, which is an enlarged sectional view of FIG. The holding hook 12 is provided with an engagement groove 12 a having a U-shaped cross section which is detachably engaged with the outer diameter of the sleeve 18 of the connecting pin 6. The engagement groove 12a opens in the direction of the connecting pin 6, and extends in the direction of expansion and contraction of the hydraulic cylinder 20 indicated by an arrow T. That is, the engagement groove 12a is opened in a direction substantially orthogonal to the opening direction of the engagement groove 9a of the connection hook 9.

Therefore, as shown in FIG. 6 (a), the gripping hook 12 is the sleeve of the connecting pin 6 which is connected to the pair of connecting hooks 9, 9 when the opening 20a of the hydraulic cylinder 20 is extended. 18 and maintain this connected state in the engaged state.

A compression coil spring 24 as a biasing means is provided between the gripping hook 12 and the cylinder body 20 b on the rod 20 a of the hydraulic cylinder 20. I have. Accordingly, the spring 24 urges the rod 20a in the direction in which the gripping hook 12 engages with the connecting pin 6.

When pressure oil was supplied to the hydraulic cylinder 20 to contract the rod 20a as shown in FIG. 6 (b), the gripping hook 12 was connected to the pair of connecting hooks 9, 9 while compressing the spring 24. The connecting pin 6 and the sleeve 18 are separated from the sleeve 18 of the connecting pin 6 so that the connecting pin 6 and the sleeve 18 can be detached from the engaging groove 9 a of the connecting hook 9 through the opening thereof.

Referring to FIG. 7 together with FIG. 6, the adjacent portion of the arm 8 and the holding hook 12, that is, the portion where the divided ends 8 a and 8 b of the arm 8 and the holding hook 12 face each other, has a holding hook. Guide grooves 26 are provided as guide means for guiding movement in the direction indicated by the arrow T of 12. The guide groove 26 extends in the direction of expansion and contraction of the arrow T of the hydraulic cylinder 20 (the direction perpendicular to the paper surface of FIG. 7). The protrusion 26 a formed on the gripping hook 12 and the fitting thereof are divided. It has a recess 26b formed at the ends 8a and 8b.

Referring to FIG. 8 together with FIGS. 1 and 4, the connecting hook 11 provided on the drive link 10 and removably engaging the sleeve 18 of the connecting pin 6 and the connecting hook 11 are connected. Gripping hook 13 movably provided on the drive link 10 that detachably engages the sleeve 18 of the connecting pin 6 in the disengaged state and prevents the connecting pin 6 from being detached from the connecting hook 11 Will be described.

The drive link 10 is formed in a substantially H shape in plan view (FIG. 8). At the forked part (upper side in Fig. 8), the intermediate link 16 and the hydraulic cylinder 14 mentioned above are pinned.

It is rotatably connected by 23. The other forked portion has divided ends 10a and 10b sandwiching the space S, and is formed with a connecting hook 11 at the tip of each of the divided ends 10a and 10b. The connection hook 11 has a U-shaped cross-section engagement groove 11 a that removably engages the outer diameter of the sleeve 18 of the connection pin 6, and the engagement groove 11 a extends the drive link 10. It is open in a direction substantially perpendicular to the direction in which it is located (rightward in Fig. 4). The connecting hook 11 is formed in substantially the same shape as the connecting hook 9 provided on the arm 8 described above.

In the space S of the drive link 10, a gripping hook 13 and a hydraulic cylinder 28 which is a fluid pressure cylinder connected to the gripping hook 13 are provided. The gripping hook 13 is attached to the tip of a rod 28 a of a hydraulic cylinder 28, and the cylinder body 28 b of the hydraulic cylinder 28 is rotatably attached to the drive link 10. The gripping hooks 13 are formed in substantially the same shape as the gripping hooks 12 described above, and have a U-shaped engaging groove 13 a with a cross-sectional shape that removably engages the outer diameter of the sleeve 18 of the connecting pin 6. Equipped, engagement groove 1

Reference numeral 3a extends in the direction in which the drive link 10 extends, which is the direction in which the hydraulic cylinder 28 expands and contracts, and is opened in a direction substantially orthogonal to the opening direction of the connecting hook 11.

The gripping hooks 13 are, like the gripping hooks 12 provided on the arm 8 described above, connected in a state where the rods 28 a of the hydraulic cylinder 28 are extended and connected to the connecting hooks 11, 11. The pin 6 is arranged to engage with the sleeve 18 and maintain this connection state in the engaged state. The rod 28 of the hydraulic cylinder 28 is provided with a compression coil spring 30 as an urging means between the gripping hook 13 and the cylinder body 28b, and the spring 30 is provided with the rod 28a. The gripping hooks 13 are biased in a direction to engage the sleeves 18.

When pressure oil is supplied to the hydraulic cylinder 28 to contract the rod 28 a, the gripping hooks 13 compress the springs 30 while the connecting pins 11 and 11 are connected to the pair of connecting hooks 11. The connecting pin 6 and the sleeve 18 can be separated from the engaging groove 9 a of the connecting hook 9 by being separated from the sleeve 18 of the pin 6. Also, the guide groove, which is the aforementioned guide means,

26 (FIG. 7), a guide means for guiding the movement of the grip hook 13 is provided at a portion where the divided ends 10a, 10b of the drive link 10 and the grip hook 13 face each other. Guide grooves (not shown) are provided.

Hydraulic cylinder 20 and compression coil spring 24 provided in space S of arm 8 and hydraulic cylinder 28 and compression coil spring provided in space S of drive link 10

As shown in FIGS. 4, 5, and 8, each space S is closed by a pair of covers 32, 32 and covers 34, 34, and the arm 8 and the drive link 10 It is built in. Covers 32 and 34 are attached to arm 8 and drive link 10 by bolts, welding, etc. (not shown).

As described above, the attachment attachment / detachment device 2 of the present embodiment includes a connection pin provided on the attachment, a combination of a connection hook and a holding hook provided on the support member, a connection pin 6, a connection hook 9, and a holding hook 12. And a combination of a connection pin 6, a connection hook 11 and a grip hook 13 are provided.

Next, the attachment / detachment of the bucket 4 as the attachment by the attachment attachment / detachment device 2 to / from the arm 8 and the drive link 10 as the support member will be described.

(1) Mounting the bucket:

To attach the baguette 4 (Fig. 2) to the arm 8 and the drive link 10, as shown in Fig. 4, the grip hook 12 provided on the arm 8 is supplied with hydraulic oil to the hydraulic cylinder 20. Also, the gripping hooks 13 provided on the drive link 10 are contracted by supplying pressure oil to the hydraulic cylinder 28, and the engagement groove 9 a of the connecting hook 9 of the arm 8 and the connecting hook 1 of the driving link 10 are reduced. 1 engagement groove 1 1a Keep each opening open.

(2) Next, the arm 8 is moved to position the connecting hook 9 between the pair of connecting pins 6 and 6 of the bucket 4, and is moved toward one connecting pin 6 (the connecting pin 6 on the left side in FIG. 4). This connection pin 6 is connected. In this state, the rod 20a of the hydraulic cylinder 20 connected to the holding hook 12 is extended to engage the holding hook 12 with the sleeve 18 of the connecting pin 6, and the connecting hook 9 and the connecting pin 6 are connected. To maintain the connection with the sleeve 18.

(3) Move the hydraulic cylinder 14 further to connect the connecting hook 11 With the other connecting pin 6 (the right connecting pin 6 in FIG. 4). In this state, the rod 28 a of the hydraulic cylinder 28 connected to the grip hook 13 is extended, and the grip hook 13 is engaged with the sleeve 18 of the connection pin 6. Maintain the connection with 18 Thus, the bucket 4 is attached to the arm 8 and the drive link 10 as shown in FIG.

(4) Removing the bucket:

In order to remove the bucket 4 attached to the arm 8 and the drive link 10, the gripping hook 12 of the arm 8 is compressed by supplying pressure oil to the mouth side of the hydraulic cylinder 20, and the drive link 10 is removed. Supply the pressurized oil to the hydraulic cylinder 28 and contract the gripping hooks 13 of, open the connecting hooks 9 and 11, and remove the sleeve 18 of the connecting pin 6 from the connecting hooks 9 and 11.

The operation of the attachment attachment / detachment device 2 as described above will be described mainly with reference to FIG.

(1) Attachment mounting position:

The connecting hooks 9 and 11 are provided at the tip of each of the arm 8 and the drive link 10 as the supporting members, to which the attachment 4 is directly attached when the attachment / detachment device is not used, and the connecting pin of the bucket 4 Since 6, 6 are engaged and connected, the position of the attachment with respect to the support member can be made the same as when the attachment / detachment device is not used.

(2) Working range of attachment:

Since the bracket is not interposed between the arm 8 and the drive link 10 which are the support members as in the conventional case, the length L1 from the arm 8 to the tip of the baggage 4 It does not change when directly installed. Therefore, it is possible to eliminate the problem that the work is uncomfortable and the attachment easily interferes with the machine body of the working machine and surrounding structures.

(3) Working force of attachment:

The distance L1 from the arm 8 to the tip of the bucket 4 L1 Force, the excavation force at the tip of the bucket due to the moving moment because it does not change when using the attachment / detachment device 2 or when directly attaching the bucket 4 Can be eliminated. (4) Attachment:

According to the attachment / detachment device 2, a conventional baggage 58 shown in FIG. 9 can be attached / detached without substantially changing the engagement shafts 58a and 58b. Therefore, various attachments conventionally used can be used as they are.

(5) Tubular member:

By fitting a sleeve 18 of a rotatable cylindrical member as in this embodiment to the connecting pin 6 of the attachment, it is possible to form a rotary joint in a compact at the connecting portion between the support member and the attachment. it can.

(6) Energizing means:

A compression coil as urging means for urging the gripping hook 1 2 (1 3) in the direction of engagement with the connecting pin 6 between the gripping hook 1 2 (1 3) and the hydraulic cylinder 20 (28) that moves it Since the spring 24 (30) is provided, even if the hydraulic cylinder 20 (28) is damaged and hydraulic oil leaks, the engagement state can be maintained by the spring 24 (30). Never lose the connection of 6,

(7) Guide means:

Since the guide groove 26 is provided as a guide means for moving the gripping hooks 12 (1 3), the gripping hooks 12 (1 3) are surely guided to a predetermined position and maintained.

(8) Built-in:

The space S of the arm 8 (drive link 10) in which the hydraulic cylinder 20 (28) and the spring 24 (30) are accommodated is covered with a cover 32 (34), and the hydraulic cylinder and spring are built in the support member. The cylinder and the spring can be properly protected from damage by obstacles, etc., and can be operated properly.

As described above, the present invention has been described in detail based on the embodiments. The present invention is not limited to the above-described embodiments. For example, as described below, various modifications may be made within the scope of the present invention. Some t can be modified.

(1) Combination of connecting pin, connecting hook and gripping hook:

In the present embodiment, a pair of connecting pins 6, connecting hooks 9 (11), and gripping hooks 12 (13) are provided in a pair. The number of such combinations depends on the type and form of the attachment. May be one set or three or more sets. For example, In the case of an attachment such as a clamshell bucket which is appropriately connected with one connecting pin, one set may be used.

(2) Tubular member:

In the present embodiment, a sleeve 18 of a tubular member is rotatably placed on the connecting pin 6 so that the connection between the connecting hook 9 (1 1) and the gripping hook 12 (1 3) is rotatable. However, the connecting pin 6 may be rotatably attached to the bearing bosses 4 c and 4 d of the attachment bucket 4 without using the sleeve 18.

(3) Fluid pressure cylinder:

In the present embodiment, the hydraulic cylinder 20 (28) is used as the hydraulic cylinder for moving the grip hooks 12 (13), but a pneumatic cylinder may be used if appropriate.

(4) Energizing means:

In the present embodiment, a compression coil spring 24 (30) is provided as urging means for urging the gripping hooks 12 (13) in the direction of engagement, that is, in the direction of extending the hydraulic cylinder 20 (28). However, if the direction in which the gripping hook is engaged is to contract the fluid pressure cylinder, the urging means may be provided so as to urge the cylinder in the direction to contract the cylinder.

Claims

,The scope of the claims

1. Attachment attachment / detachment device that detachably attaches attachments to support members.

A connecting pin provided on the attachment, a connecting hook provided on the support member and removably engaged with the connecting pin, and a connecting pin releasably engaged with the connecting pin connected to the connecting hook. Attachment attachment / detachment device characterized by comprising one or more sets of gripping hooks movably provided on the support member for preventing the hooks from being detached from the hooks.

2. The attachment / detachment device according to claim 1, further comprising: a tubular member rotatably fitted to the connecting pin, wherein the connecting hook and the holding hook engage with the connecting pin via the tubular member. .

3. The attachment / detachment attachment / detachment according to claim 1 or 2, further comprising a guide between the support member and the gripping hook for guiding movement of the gripping hook with respect to the connection pin in the direction of engagement / disengagement.

4. A hydraulic cylinder connected to the grip hook, wherein the hydraulic cylinder includes biasing means for biasing the grip hook in a direction to engage with the connecting pin. Attachment attachment / detachment device as described in 1 above.

5. The attachment attaching / detaching device according to claim 4, wherein the fluid pressure cylinder and the urging means are built into the support member.