KR20200053356A - Safe-Locking Type Quick Coupler - Google Patents

Abstract

The present invention relates to a safe-locking type quick coupler (1) comprising: an external body (3); a fixing hook (5) for fitting and fixing a first coupling pin (P1) of a work tool; a movable hook (7) for biting and fixing a second coupling pin (P2) of the work tool when rotated to a fixed position, and uniting and releasing the second coupling pin (P2) when rotated to a release position; an operating cylinder (9) for operating the movable hook (7) to fix or release the second coupling pin (P2); and a safety lock mass (11) for blocking or allowing rotation of the movable hook (7) at the fixed position at which the second coupling pin (P2) is fixed. Therefore, when a coupling pin of the work tool such as a cutter or a bucket is engaged with the quick coupler on a boom, even when the movable hook fixed to the coupling pin loses fixing power to the coupling pin due to a failure in the operating cylinder, the movable hook can be kept at the fixed position by the safety lock mass to prevent an accident due to the work tool separated from the coupler, thereby greatly increasing work safety.

Description

Safe-Locking Type Quick Coupler

The present invention relates to a safety lock-type quick coupler, and more specifically, to a quick coupler that is mounted on a boom tip of various construction machinery equipment such as a hydraulic cutting machine or an excavator, so that a work mechanism can be replaced detachably according to the type of work. The present invention relates to a safety-locked quick coupler that greatly improves work safety by maintaining a movable hook for fixing a coupling pin such as a cutter or a bucket in a fixed position.

In general, construction machinery equipment using a boom, such as a hydraulic cutting machine or an excavator, is replaceable with a work mechanism at the end of the boom so that it can be used for various purposes in various working environments. However, in order to use the construction machinery equipment for various purposes as described above, it is inevitably required to replace the work tool, and for this purpose, a quick coupler is employed at the tip of the boom.

The quick coupler not only has to enable the compatibility of the work tool as described above, but recently, improvements have been made in a direction to allow quick and easy replacement of the work tool.

As one of them, the applicant has proposed a safety lock device for a quick coupler (Registration Patent No. 10-1542226). This locking device, as shown by reference numeral 101 in Figure 1, the fixed hook 105 formed on the bottom of the outer body 103, the movable hook 107, the fixed hook clasp 109, the movable hook clasp 111 , By holding the engaging pins (P1, P2) of a work tool such as a bucket by the operation cylinder 113, and the hook linkage linkage 115, it is designed to be detached from the work tool quickly and easily.

Therefore, this locking device 101 adopts a hook interlocking linkage 115 to link the rotation of the movable hook 107 with the rotation of the fixed hook clasp 109 when the work mechanism is removed, the operating cylinder (113) is reduced and the movable hook (107) rotates counterclockwise around the pivot pin (133) to open to a fixed release position indicated by a hidden line. The movable hook (107) operates the hook linkage linkage (115). By pressing the roller 141, the fixed hook clasp 109 is rotated counterclockwise through the operation bar 143. Accordingly, the fixed hook clasp 109 is released to the position indicated by the hidden line in connection with the rotation of the movable hook 107, thereby releasing the fixation to the first coupling pin P1, by the clasp interlocking linkage 117. The movable hook clasp 111 is also opened. Conversely, when connecting a work tool, the operating cylinder 113 is extended to fix the second coupling pin P2 by the movable hook 107. In this process, the pressing of the movable hook 107 against the operating roller 141 As this is released, the fixed hook clasp 109 returns to the original locked position by the restoring force of the torsion spring to grip the first coupling pin P1.

By the way, the conventional safety lock for the quick coupler 101, the hook interlocking linkage 115 and the hook interlocking linkage 115 to interlock the rotation of the fixed hook clasp 109 and the movable hook clasp 111 to the rotation of the movable hook 107 Since a complex mechanism consisting of a number of parts, such as a clasp-linkage 117, is used, there is a high possibility of failure such as wear or damage of parts, and a relatively high probability of malfunction due to a complicated structure, and maintenance is relatively high. There was an issue that became tricky.

In addition, since there are many parts and a complicated structure, there is a problem in that production efficiency is reduced, such as increase in assembly time and time during production, and thus increase production cost.

Moreover, since the interlocking of each part such as an operation cylinder, a movable hook, a movable hook clasp, or a fixed hook clasp is mechanically made, there is a disadvantage in that interworking between parts cannot be avoided, and thus parts cannot be operated independently.

KR 10-1069636

The present invention has been proposed to solve the problems of the conventional quick coupler as described above, while allowing the tool to be quickly and detachably replaced with a detachable mechanism, preventing separation of the work tool even if an internal component such as an operation cylinder fails. Its purpose is to ensure work safety.

In addition, by making it possible to simplify the structure for preventing the separation of the above-described work equipment, the purpose is to improve the quality or production efficiency of the product and to facilitate maintenance.

The present invention to achieve this object is an external body; A fixing hook formed on one side of the outer body to fit and fasten the first coupling pin of the work tool; It is installed to be rotatable on the external body from the opposite side of the fixing hook, and when it is rotated to a fixed position, it is fixed by biting the second coupling pin of the work mechanism, and when it is rotated to a fixed release position, the second coupling pin is released. A movable hook for unlocking; One end is coupled to one side of the external body, the other end is coupled to one side of the movable hook, the operation cylinder to operate the movable hook to fix or release the second coupling pin; And a safety lock bundle that prevents or allows rotation of the movable hook at a fixed position to fix the second coupling pin.

In addition, the safety lock bundle is mounted on the force point side end of the movable hook, it is preferable to stop the rotation of the movable hook by being fitted to the external body in the fixed position.

In addition, the safety lock bundle, wedge mounted to reciprocate on the movable hook; And it is preferably made to include; by pressing one end of the wedge, the operating means for causing the wedge to move in a direction to restrain or release the movable hook.

In addition, it is preferably formed on one side of the movable hook to insert the wedge, it includes a guide hole for guiding the movement of the wedge.

In addition, it is preferable to include a wedge hole formed on one side of the outer body so that the wedge can be fitted when the movable hook is restrained at the fixed position.

In addition, the wedge hole, the cap member for closing the inner opening; And a rebound spring which is built in to be supported by the cap member and is configured to repel in one direction with respect to the reciprocating motion of the wedge.

According to the safety lock type quick coupler of the present invention, when the coupling pin of a work tool such as a cutter or a bucket is bitten by a quick coupler, the movable hook fixed to the coupling pin becomes inoperative due to a malfunction of the operation cylinder, etc. Even if the fixing force for the loss is lost, since the movable hook can be maintained in the fixed position by the safety lock bundle, it is possible to prevent accidents due to work tools separated from the coupler, and thus, it is possible to greatly increase the safety of work.

In addition, since the above-described safety lock bundle is simply implemented by the wedge and the operation means, the internal structure of the coupler can be simplified, so that the product quality or production efficiency can be doubled, and the maintainability and service life can be further improved. do.

In addition, since the wedge moving by the actuating means restrains the movable hook in a fixed position while the actuating means is stopped, the movable hook cannot be operated even if the operating cylinder and the operating means fail simultaneously. By doing so, it is not possible to rotate, but it is possible to further improve work safety by maintaining a fixed position so that the connection with the coupling pin can be maintained.

1 is a front view showing a conventional quick coupler.
Figure 2 is a front view showing a safety lock-type quick coupler according to an embodiment of the present invention in an assembled working state.
3 is a plan view of FIG. 2;
FIG. 4 is a partially enlarged plan view showing an enlarged portion of the safety lock bundle of FIG. 3.
5 is a partially enlarged plan view showing a state in which the operation means of FIG. 4 is operated to release the restraint of the movable hook by the wedge.

Hereinafter, a safety-locking quick coupler according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The quick coupler according to the present invention, as shown by reference numeral 1 in FIGS. 2 and 3, largely the outer body (3), the fixed hook (5), the movable hook (7), the operating cylinder (9), and the safety lock It comprises a bundle (11).

Here, first, the outer body 3 is a part forming the outer shape of the quick coupler 1, as shown in FIGS. 2 to 5, the front plate 21 and the back plate 23 made of a plurality of plate materials And it is made of a plurality of connecting rods (25) connecting them, and thus, the external body (3) is coupled to a boom such as an excavator through a connecting rod (25), a fixed hook (5) or a movable hook (projecting downward) 7) By using a gripping means such as a bucket, tongs, a work tool such as a breaker or cutter is combined.

The fixing hook (5) is a means for inserting and fixing the first coupling pin (P1) of the coupling pin of the work tool, such as the bucket or cutter mentioned above, as shown in FIGS. 1 is formed to be concave in the form of a hook that opens to the right side on one side of the outer body 3, that is, in the lower right corner of FIG. 2, so as to fit and fix the coupling pin P1.

The movable hook (7) is a means for fixing or releasing the second coupling pin (P2) of the work tool on the opposite side of the fixing hook (5), as shown in Figures 2 and 3, as a whole hook shape It is, one end corresponding to the position of the hook handle is installed to be rotatable through the first pivot pin 31 on the lower left side of the drawing facing the fixed hook 5, that is, on one side of the external body 3. Accordingly, the movable hook 7 is rotated around the first rotating pin 31 by the operating cylinder 9, and the second coupling pin P2 of the work tool is fixed or unfixed according to the rotating position. . That is, in the fixed position shown in FIG. 2, the second engagement pin P2 is fixed by biting. On the contrary, in the fixed release position rotated in the direction of arrow A in FIG. 3, the second engagement pin P2 is released and fixed. . As described above, since the working point side end L of the movable hook 7 is slid toward the center of the outer body 3 to fix the second coupling pin P2, this quick coupler 1 is called a pull type. .

The operation cylinder 9 is an actuator for operating the movable hook 7 as mentioned above, as shown in FIGS. 2 to 5, the right end of the drawing, that is, the fixed end of the cylinder body 51 is an external body (3) is pivotably coupled through the second pivot pin 33, the left end of the drawing, that is, the end of the push rod 53, the push rod pin 36 to the force point side end E of the movable hook 7 ). Accordingly, the operation cylinder 9 rotates the movable hook 7 to a fixed or unlocked position by an expansion / contraction operation, and when extended, the movable hook 7 is positioned at a fixed position as shown in FIG. 2, and vice versa. When contracted, the movable hook 7 is rotated in the direction of the arrow A in FIG. 2 to be positioned at the fixed release position as shown in FIG. 2.

The safety lock bundle 11 is a safety means for maintaining the movable hook 7 in a fixed position in preparation for a failure of the quick coupler 1, especially the operation cylinder 9, as shown in FIGS. 2 to 5, In the fixed position, the movable hook 7 for fixing the second coupling pin P2 is restrained to prevent rotation, and in other positions, the movable hook 7 is allowed to rotate. At this time, it is possible to restrain the rotation of the movable hook 7 in the operated state as well as the safety lock bundle 11, but in this embodiment, when the operation is stopped, the rotation of the movable hook 7 is restricted to move the movable hook ( 7) is to be kept in a fixed position. In this case, of course, when the safety lock bundle 11 is operated, the movable hook 7 is allowed to rotate.

To this end, the safety lock bundle 11 is mounted on the force point side end E of the movable hook 7, for example, as shown in FIGS. 2 to 5, and fixed by being fitted to the external body 3 during operation. The movable hook 7 is prevented from rotating at the position. Therefore, the safety lock bundle 11 is made of a wedge 37 and an operation means 39, as shown in FIGS. 2 to 5, for example.

Here, the wedge 37 is a member that directly restricts the rotation of the movable hook 7, for example, as shown in Figs. 3 to 5, in the thickness direction of the outer body 3, that is, reciprocating in the front-rear direction It is mounted on the movable hook (7) or other parts in a state that can exercise. That is, the wedge 37 may be mounted at a position that prevents any part of the movable hook 7 from rotating by part of the movable hook 7 in accordance with the operation or stoppage of the safety lock bundle 11 regardless of the installation position. However, the wedge 37 is inserted into the guide hole 41 formed to extend in the thickness direction so as to insert the wedge 37 on one side of the movable hook 7 as shown in FIGS. It is preferable to stop the rotation of the movable hook 7 by engaging the neighboring member while reciprocating in the thickness direction along).

At this time, the movable hook (7), as shown in Figures 2 to 5, while forming a hook-shaped ring portion 71 and a force point side end (E) constituting the working point side end (L), sandwiching the ring portion 71 A bar made of a pair of hinge parts (73,74) interposed with the bar, the hinge parts (73,74), as shown in Figure 2, guide the wedges (37) extended in the thickness direction in a forward and backward reciprocating state For mounting on the ball 41, the width of the rear hinge portion 74 is narrower than the front hinge portion 73 on which the guide hole 41 is formed. That is, the hinge portions 73 and 74 have a width sufficient to fit both ends of the push rod pin 36, and the front hinge portion 73 further has a width sufficient to form the guide hole 41. In addition, a support block 75 is attached to the upper surface of the ring portion 71 to support the operation means 39 to be described later.

Of course, even if the wedge 37 is inserted into the guide hole 41, it is possible to restrain the rotation of the movable hook 7 by being caught in an adjacent member while moving back and forth in the thickness direction, but as shown in FIG. 4, the movable hook ( It is preferable to restrain the rotation of the movable hook 7 by being fitted into the wedge hole 43 when projecting forward than 7). To this end, the wedge hole 43 is formed in the front plate 21 so as to be aligned with the guide hole 41 at a fixed position of the movable hook 7.

The operating means 39 is a means for reciprocating the wedge 37 as described above in the front-rear direction, as long as it can operate the wedge 37 regardless of the position or structure, any one can be employed. In Figure 3 to 5, as shown in Figure 5, employs a hydraulic cylinder that reciprocates by directly or indirectly pressing one end of the wedge 37. At this time, the hydraulic cylinder, as shown in Figures 2 and 3, by receiving hydraulic pressure from a hydraulic cylinder or a separate hydraulic source connected to the operating cylinder (9) connected through the hydraulic line 44, the wedge 37 is a movable hook (7) Try to exercise in the direction of restraint or liberation.

When the hydraulic cylinder is employed as the operating means 39, the wedge 37 can be directly pressed and operated by the hydraulic cylinder, of course, but in this embodiment, as shown in FIGS. 3 to 5, the wedge (37) The hydraulic cylinder may be operated indirectly through a linkage bar 45 connected to be disposed at a right angle in the rear end. At this time, the link bar 45 is designed to secure a minimum water pressure surface capable of receiving force from the piston 46 of the hydraulic cylinder. In addition, for example, the wedge 37 has a square shape so as to maintain the phase of the connecting bar 45 in contact with the piston 46, or always maintains contact with the wedge 37 regardless of the rotation of the wedge 37. To do so, the link bar 45 may be manufactured in the form of a disk (not shown) centered on the wedge 37.

On the other hand, since the wedge 37 is configured to reciprocate through the actuating means 39 as above, it can be designed to be entirely reciprocated by a hydraulic cylinder employed as the actuating means 39, as well as FIGS. As shown in FIG. 5, it may be designed to operate only in one direction by the hydraulic cylinder and to reciprocate while restoring to the original position when the operation is stopped.

To this end, the wedge hole 43 may include a cap member 55 and a rebound spring 57. Here, the cap member 55 is a means for closing the opening of the rear end of the opposite side end of the wedge hole 43 of the guide hole 41 into which the wedge 37 is fitted, as shown in FIGS. 3 to 5, The guide hole 41 serves to support one end, that is, the rear end of the rebound spring 57 mounted inside. In addition, the rebound spring 57 is interposed between the shoulder portion of the wedge 37 and the cap member 55 in the guide hole 41 so as to be supported by the cap member 55, and the reciprocation of the wedge 37 The movement is supposed to react in either direction. That is, for example, as shown in Figures 4 and 5, when the operating means 39 is actuated is compressed by the wedge 37, and when the actuating means 39 is stopped, the wedge 37 is repelled by the reaction force. By returning, the wedge 37 is reciprocated along the guide hole 41.

Now, the operation of the safety lock-type quick coupler 1 according to the preferred embodiment of the present invention will be described.

In order to mount a work tool such as a bucket or a cutter to the quick coupler 1 of the present invention, first, as shown in FIG. 2, the first coupling pin P1 of the work tool is inserted into the fixing hook 5 and the second The engaging pin (P2) is brought into contact with the movable hook (7) and the adjacent locking bar (28).

Then, when the operation cylinder 9 is operated, the push rod 53 is extended to the left in the drawing, and the movable hook 7 is rotated in the opposite direction to the arrow A. Accordingly, the movable hook (7), the lower hook portion 71 gradually approaches the second coupling pin (P2), and finally the second coupling pin (P2) as shown in Figure 2 between the locking bar 28 and , And as a result, the second coupling pin P2 reaches a fixed position.

In this fixed position, the guide hole 41 and the wedge hole 43 are aligned, and when the operation of the operation means 39 is stopped by the user's operation, as shown in FIGS. 3 and 4, the wedge 37 ) Is inserted into the wedge hole 43 by advancing by the restoring force of the rebound spring 57. Accordingly, the wedge 37 is inserted into the guide hole 41 and the wedge hole 43 at the same time, so that the movable hook 7 cannot move relative to the front plate 21, and thus is restrained from being able to rotate. do.

Thereafter, in order to rotate the movable hook 7 in a fixed position, the operating means 39, that is, the hydraulic cylinder operates according to the user's operation so as to be extended as illustrated in FIG. 5. Thus, when the operating means 39 is extended, the link bar 45 is retracted by the operating means 39, and thus the wedge 37 is also reversed, while the wedge 37 compresses the rebound spring 57. It retreats and detaches from the wedge hole 43.

In this way, the movable hook 7, which is released from the restraint by the wedge 37, is rotated in the direction of the arrow A in FIG. 2 by the contraction of the operation cylinder 9, thereby fixing it to the second coupling pin P2. Will release it.

 Finally, the first and second coupling pins P1 and P2 are separated from the fixing hook 5 and the movable hook 7 when the first coupling pin P1 is removed from the fixing hook 5 to release the fixing. The mechanism can be easily separated from the quick coupler (1), and the work mechanism can be detached again and again by repeating the above process at a later operation.

1: Quick coupler 3: External body
5: fixed hook 7: movable hook
9: Operation cylinder 11: Safety lock bundle
21: front panel 23: back panel
37: wedge 39: operating means
41: guide 43: wedge hole
45: connection bar 55: cap member
57: recoil spring 71: ring
73, 74: front and rear hinges E: force point side
L: Action point side ends P1, P2: first and second coupling pins

Claims (6)

External body 3;
A fixing hook (5) formed on one side of the outer body (3) to fit and fasten the first coupling pin (P1) of the work tool;
It is installed to be rotatable on the external body 3 on the opposite side of the fixing hook 5, when it is rotated to a fixed position, it is fixed by biting the second coupling pin P2 of the work tool and rotating to a fixed release position A movable hook (7) that releases and releases the second coupling pin (P2) at one time;
One end is coupled to one side of the outer body (3), the other end is coupled to one side of the movable hook (7), to operate the movable hook (7) to fix or release the second coupling pin (P2) An operation cylinder (9); And
Safety lock type quick coupler, characterized in that it comprises a safety lock bundle (11) to prevent or allow the rotation of the movable hook (7) in a fixed position to secure the second coupling pin (P2). The method according to claim 1,
The safety lock bundle 11 is mounted on the force point side end (E) of the movable hook (7), it is fitted to the external body (3) at the fixed position to prevent the rotation of the movable hook (7) Features a safety lockable quick coupler. The method according to claim 1 or claim 2,
The safety lock bundle (11),
A wedge 37 mounted to reciprocate on the movable hook 7; And
Safety locking type, characterized in that comprises a; pressing the one end of the wedge (37), the wedge (37) operating means (39) to move in the direction of binding or releasing the movable hook (7) Quick coupler. The method according to claim 3,
Safety lock-type quick coupler, characterized in that it is formed on one side of the movable hook (7) to insert the wedge 37, a guide hole (41) for guiding the movement of the wedge (37). The method according to claim 3,
Safety lock-type quick coupler, characterized in that it comprises a wedge hole (43) formed on one side of the outer body (3) so as to fit the wedge (37) when the movable hook (7) in the fixed position . The method according to claim 5,
The wedge hole 43,
A cap member 55 closing the inner opening; And
It is built to be supported on the cap member 55, the rebound spring (57) is resilient to the reciprocating motion of the wedge (37) in any direction to repel; a safety lock-type quick coupler comprising a.

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