KR100861487B1 - Attachment coupler for heavy machinery having an improved automatic safety function - Google Patents

Abstract

The attachment coupler for heavy equipment according to the present invention, the fixed hook 60 and the moving hook 40, the hydraulic cylinder 70 for moving the mobile hook 40, the hydraulic pressure to generate the hydraulic power to shrink or expand the hydraulic cylinder Coupler locked side hydraulic line for providing a passage through which the hydraulic pressure is transferred from the hydraulic pump 350 to the cylinder head side 70b of the hydraulic cylinder 70 for the expansion of the pump 350, the hydraulic cylinder 70 ( 102, a passage through which hydraulic pressure is transmitted from the hydraulic pump 350 to the cylinder rod side 70a of the hydraulic cylinder 70 and the automatic safety device cylinder 110 for contraction of the hydraulic cylinder 70. A sequence valve installed between the coupler release side hydraulic line 101 and the coupler release side hydraulic line 101 and the cylinder rod side 70a of the hydraulic cylinder and opened only when a hydraulic pressure of a predetermined pressure level or more is applied. Pov 72 The coupler release side hydraulic line 101 branches in front of the sequence valve 72 so that one line is connected to the sequence valve 72 and another line directly to the fail-safe cylinder 110. Connected. According to the present invention, by additionally installing a sequence valve on a hydraulic line to which hydraulic pressure is supplied to release (shrink) the hydraulic cylinder, the releasing operation of the safety device cylinder and the releasing operation of the hydraulic cylinder are sequentially performed during the release operation of the attachment coupler. If you want to remove the attachment coupler normally, there is an effect to ensure that the automatic safety device is not locked unnecessarily.

Attachment, Coupler, Heavy Equipment, Check Valve, Sequence Valve, Steel Ball, Rod, Cylinder, Solenoid Valve, Hydraulic, Hydraulic Oil, Automatic Safety Device

Description

Attachment coupler for heavy machinery having an improved automatic safety function}

1 is a cross-sectional view showing the configuration of a conventional heavy duty attachment coupler 10a.

2 is a perspective view showing the configuration of the attachment coupler (10b) for heavy equipment that improves the disadvantages of the attachment coupler (10a) for heavy equipment of FIG.

FIG. 3 is an exploded perspective view showing the internal configuration of the failsafe cylinder 110 in the attachment coupler 10b for heavy equipment of FIG. 2.

4 is a hydraulic circuit diagram of the attachment coupler 10b for heavy equipment of FIG.

Figure 5 is a perspective view of the attachment coupler 10 for heavy equipment with improved automatic safety function according to the present invention.

6 and 7 are hydraulic circuit diagrams of the attachment coupler 10 for the heavy equipment of FIG. 5, of which FIG. 6 shows a state in which the sequence valve 72 is closed, and FIG. 7 shows a state in which the sequence valve 72 is opened. Illustrated.

8 is a cross-sectional view showing the operation of the attachment coupler for heavy equipment equipped with an improved automatic safety function according to the present invention, showing the hydraulic cylinder 70 and the automatic safety device cylinder 110 of the attachment coupler 10 is extended.

Figure 9 is a cross-sectional view of the safety device cylinder 110 in the contracted state in the attachment coupler for heavy equipment according to the present invention, Figure 10 is a cross-sectional view taken along the line X-X in FIG.

11 and 12 illustrate a process in which the failsafe cylinder 110 extends in the attachment coupler for heavy equipment according to the present invention.

Figure 13 shows a state in which the fail-safe cylinder 110 is locked and no longer contracted in the attachment coupler for heavy equipment according to the present invention.

14 and 15 illustrate a process in which shrinkage is performed in a state in which the safety device cylinder 110 is not locked in the attachment coupler for heavy equipment according to the present invention.

* Description of the symbols for the main parts of the drawings *

10,10a.10b: attachment coupler for heavy equipment

20: coupler body 30: attachment

40: moving hook 50: hinge shaft

60: fixed hook 70: hydraulic cylinder

70a: Hydraulic cylinder rod side 70b: Hydraulic cylinder head side

71: pilot check valve 72: sequence valve

72a: bypass line 80: hydraulic cylinder housing

90: hydraulic cylinder rod 100: hydraulic cylinder release side port

101: coupler release side hydraulic line 102: coupler locked side hydraulic line

103: hydraulic line 104: return line

110: self-locking cylinder

120: (automatic safety cylinder) housing

130: (automatic safety cylinder) rod

140: first piston 150: second piston

160: spring 170: steel ball

180: hose union 190: first stop

200: second stop jaw 210: third stop jaw

220: fourth stopper 230: tapered machining portion

231: locking groove 240: tapered space portion

250: round processing part 260: intake and exhaust passage

280: first fixing pin 290: second fixing pin

300: first fixing hole 310: second fixing hole

320: hydraulic line 330: solenoid valve

340: oil tank 350: hydraulic pump

The present invention relates to an attachment coupler for heavy equipment with an improved automatic safety function, and in particular, the safety of the attachment coupler in a state in which the attachment coupler is dually supported by the hydraulic cylinder and the automatic safety device cylinder. It relates to an attachment coupler for a heavy equipment that allows the hydraulic cylinder and the safety device cylinder to perform the release operation smoothly by preparing the release operation first and then releasing the hydraulic cylinder.

The heavy equipment widely used in civil engineering and construction sites can be combined with various attachments according to the needs of the work. Excavators, which are typical construction equipment, are used by attaching and detaching various attachments such as a bucket, a breaker, a vibrator, a hammer, and the like using a coupler installed at the lower side of the excavator arm and the lower side of the link. A mechanism for coupling such attachment to the arm of heavy equipment is called a coupler, and FIG. 1 shows the structure of a conventional heavy duty attachment coupler 10a.

As shown in FIG. 1, the conventional heavy duty attachment coupler 10a has a fixed hook 60 and a movable hook 40, and the coupling shafts 31a and 31b of the attachment 30 are respectively moved. The hook 40 and the fixed hook 60 are inserted and supported. In addition, the movable hook 40 is rotated by the operation of the hydraulic cylinder 70 in a state where one end is pin-coupled to the coupler 10 and the other end is pin-coupled to the rod 90 of the hydraulic cylinder 70. The coupling shaft 31a is restrained or released.

However, the conventional attachment coupler 10 for heavy equipment has a problem in that the attachment 30 is separated from the coupler when the hydraulic oil supplied to the hydraulic cylinder 70 leaks or the hydraulic cylinder rod 90 is broken. That is, when the hydraulic oil supplied to the hydraulic cylinder 70 leaks, the hydraulic cylinder 70 is contracted at a high speed, and when the hydraulic cylinder is contracted, the moving hook 40 of the coupler 10 restraining the attachment 30. The attachment 30 is separated from the coupler 10 while the restraining force restraining the pin of the attachment is released.

In addition, even when the hydraulic cylinder rod 90 is broken, the force pushing the movable hook 40 is removed, so that the attachment hook 30 is separated from the coupler 10 by the backward movement of the movable hook 40. there was.

In order to solve this problem, the applicant of the present invention has applied for a "application attachment coupler for heavy equipment equipped with an automatic safety device" as a patent application No. 2006-29751, the contents of the present invention as shown in Figs. same.

Figure 2 is a perspective view showing the configuration of the attachment coupler (10b) for heavy equipment to improve the disadvantages of the attachment coupler (10a) for heavy equipment of Figure 1, Figure 3 is an automatic safety in the attachment coupler (10b) for heavy equipment of Figure 2 4 is an exploded perspective view showing the internal configuration of the apparatus cylinder 110, and FIG. 4 is a hydraulic circuit diagram of the attachment coupler 10b for heavy equipment of FIG.

2, the attachment coupler (10b) for heavy equipment according to the invention of the patent application No. 2006-29751 has a body 20, the fixed hook 60 and the movable hook 40 in the lower portion of the body 20 Are provided with a predetermined interval so that the mutually arranged. The fixed hook 60 is integrally formed with the body 20, the movable hook 40 rotates about the hinge shaft 50, and a hydraulic cylinder 70 is installed to rotate the movable hook 40. do. In addition, the hydraulic cylinder 70 is composed of a cylinder housing 80 and a cylinder rod 90, the cylinder housing 80 is fixed to the body 20 by a second fixing pin 290, the cylinder rod 90 is fixed to one side of the movable hook 40 by the first fixing pin 280.

Then, the hydraulic cylinder 70 is extended or contracted by the pressure oil supplied from the excavator serves to rotate the moving hook (40). In the attachment coupler 10b according to the invention of Patent Application No. 2006-29751, the first fixing hole 300 formed in the housing 120 of the failsafe cylinder 110 moves with the hydraulic cylinder rod 90. Coaxial with the first fixing pin 280 coupled to the hook 40, it is fixed together by the first fixing pin 280. In addition, the second fixing hole 310 of the rod portion 130 of the automatic safety device cylinder 110 is a second fixing pin 290 which couples the housing 80 of the hydraulic cylinder 70 and the coupler body 20. Coaxial with and fixed together by the same second fixing pin 290.

The safety device cylinder 110 is extended or contracted together with the hydraulic cylinder 80 is extended or contracted in conjunction with the expansion or contraction by the pressure oil supplied from the excavator, the safety device cylinder 110 is a hydraulic cylinder ( The principle that can be operated in accordance with 70) is that the internal structure of the failsafe cylinder 110 is designed so that the cylinder's contraction is always free while the cylinder's contraction is free only when the cylinder is in the unlocked state. Because. That is, the automatic safety device cylinder 110 is connected to the release side port 100 and the hydraulic line 320 of the hydraulic cylinder 70, when the hydraulic cylinder 70 extends freely with the hydraulic cylinder On the other hand, when the hydraulic cylinder 70 is contracted, the contraction is caused by an abnormal contraction action by distinguishing whether the contraction is caused by a normal contraction action or an abnormal contraction action (pressure oil leakage, rod breakage, etc.). When the automatic safety device cylinder 110 is locked (locking) to prevent the hydraulic cylinder 70 from contracting any more, if the normal contraction action, the locking of the automatic safety device cylinder 110 is released to the hydraulic cylinder Allow 70 to contract.

Referring to the exploded perspective view of Figure 3, the internal structure of the automatic safety device cylinder 110 of the attachment coupler (10b) for heavy equipment according to the invention of the patent application No. 2006-29751 will be described.

In FIG. 3, the first piston 140 is formed at the tip of the rod 130 in a state where the second piston 150 and the spring 160 are assembled to the rod 130 of the failsafe cylinder 110 first. Assembly is fastened. In addition, the first and second pistons 140 and 150 have through-holes formed in the center thereof, and the rod 130 is formed to have a diameter smaller than the rear portion 132 while the front portion 131 forms a step. have. The second piston 150 has a stepped jaw portion (see the third stop jaw 210 of FIGS. 3 and 7A) and a first piston in a state where the second piston 150 is fitted into the stepped small diameter portion 131 of the rod 130. It is flowable between 140. Subsequently, the rod 130 in which the first and second pistons 140 and 150 and the spring 160 are assembled is assembled with the housing 120.

A plurality of holes 171 are formed through the surface of the second piston 150 in the circumferential direction, and each of the holes 171 has a size and a state where steel balls 170 can pass freely. do.

Meanwhile, the hose union 180 may be connected to the rod portion 130 of the automatic safety device cylinder 110 so that the release side port 100 of the hydraulic cylinder 70 (see FIG. 2) and the hydraulic line 320 (see FIG. 2) may be connected. ) Is assembled.

Figure 4 is a hydraulic circuit diagram of the release operation of the attachment coupler according to the invention of the above patent application 2006-29751. Referring to Figure 4, the hydraulic pressure generated in the hydraulic pump 350 during the release operation of the conventional attachment coupler is transmitted to the hydraulic cylinder 70 via the solenoid valve 330. Here, the solenoid valve 330 and the hydraulic cylinder rod side 70a are connected by the release side hydraulic line 101 of the coupler, and are commonly used as the hydraulic cylinder rod side 70a and the automatic safety device cylinder 110. The thin hydraulic line 320 branches from the hydraulic cylinder release side port 100 and is supplied with hydraulic oil to the hydraulic cylinder rod side 70a and the automatic safety device cylinder 110, respectively.

Thus, the pressurized oil branched from the hydraulic cylinder release side port 100 is supplied to the safety device cylinder 110 through the hydraulic line 320 on the one hand to prepare for the operation of releasing the locking of the safety device. On the other hand, it is also supplied to the hydraulic cylinder rod side 70a to perform the release (contraction) operation of the hydraulic cylinder 70.

At this time, the hydraulic cylinder 70 and the automatic safety device cylinder 110 are fixed by the same first and second fixing pins 280 and 290 (see FIG. 2) to automatically release (shrink) the hydraulic cylinder 70. The safety device cylinder 110 also performs a release (contraction) operation.

Meanwhile, in FIG. 4, reference numeral 70b denotes a hydraulic cylinder head side, and receives hydraulic pressure through the pilot check valve 71. When the hydraulic pressure is supplied, the hydraulic cylinder 70 is extended. In addition, reference numeral 340 is an oil storage tank, 102 is a coupler locked side hydraulic line connecting the pilot check valve 71 and the solenoid valve 330, 103 is a hydraulic pump 350 and the solenoid valve 330 ) Is a hydraulic supply line connecting the oil, and 104 is a return line for returning oil to the oil storage tank 340.

However, the invention of the patent application No. 2006-29751 is to support the moving hook 40 of the attachment coupler (10b) to the automatic safety device cylinder 110 and the hydraulic cylinder (70) to separate the attachment due to an accident accident Although there was an advantage that can be prevented, in the process of supplying the hydraulic oil to the safety device cylinder 110 and the hydraulic cylinder 70 at the same time, the reverse operation of the hydraulic cylinder 70 is preceded by the safety device cylinder 110 In this case, the locking of the failsafe cylinder 110 may not be released. Thus, in the state in which the lock of the automatic safety device cylinder 110 is not released, the hydraulic cylinder 70 fixed by the same fixing pins 280 and 290 also cannot be released, even if the attachment is normally to be removed. There was a problem that the release operation is not made smoothly.

In order to solve the above problems, the sequential operation of preparing the releasing operation by releasing the automatic safety device cylinder 110 prior to the releasing operation of the hydraulic cylinder during the releasing operation of the attachment coupler, and then releasing the hydraulic cylinder. It is an object of the present invention to provide an attachment coupler for heavy equipment with an improved automatic safety function that allows the detachment operation to be performed smoothly when the attachment is normally detached.

Heavy duty attachment coupler with an improved automatic safety function provided by the present invention to achieve the above object, the fixed hook 60 and the movable hook (40) and the movable hook to be engaged with the engaging pins formed in the construction equipment for heavy construction, respectively In the attachment coupler 10 for heavy equipment including a hydraulic cylinder 70 for moving the hook 40, one end of the movable hook 40 is hinged to a portion of the body of the coupler 10 and the movable hook 40 At the other end of the hydraulic cylinder 70 and the automatic safety device cylinder 110 are pin-coupled at the same time, the hydraulic pump 350 for generating a hydraulic power to contract or extend the hydraulic cylinder; A coupler locking side hydraulic line (102) for providing a passage through which hydraulic pressure is transmitted from the hydraulic pump (350) to the cylinder head side (70b) of the hydraulic cylinder (70) for the expansion of the hydraulic cylinder (70); A coupler release providing a passage through which hydraulic pressure is transmitted from the hydraulic pump 350 to the cylinder rod side 70a of the hydraulic cylinder 70 and the automatic safety device cylinder 110 for contraction of the hydraulic cylinder 70. Side hydraulic line 101; And a sequence valve (72) installed between the coupler release side hydraulic line (101) and the cylinder rod side (70a) of the hydraulic cylinder and opened only when hydraulic pressure is applied at a predetermined pressure level or higher. The coupler release side hydraulic line 101 is branched in front of the sequence valve 72 so that one line is connected to the sequence valve 72 and another line is directly connected to the failsafe cylinder 110. It is done.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and effect of the attachment coupler for heavy equipment with an improved automatic safety function according to the present invention. 5 to 15, the same reference numerals are used for the same components as those of the prior art.

Figure 5 is a perspective view of the attachment coupler 10 for heavy equipment with improved automatic safety function according to the present invention.

Comparing the present invention of FIG. 5 with the invention of the above-mentioned Patent Application No. 2006-29751 of FIG. 2, the difference is that the sequence valve 72 is added to the hydraulic cylinder 70 of the attachment coupler 10. The sequence valve 72 is connected to the hydraulic cylinder release side port 100, in order for the hydraulic pressure generated from the hydraulic pump to flow into the hydraulic cylinder release side port 100 for contraction (release) of the hydraulic cylinder 70. Pass through sequence valve 72.

In general, the sequence valve is a valve that closes the passage of the fluid until the set pressure is reached and then opens the passage of the fluid only when the set pressure is reached. The sequence valve mainly controls the operation sequence of the circuit according to the pressure of the fluid in the hydraulic circuit. Used for. That is, in order to operate a plurality of actuators in a certain order in the hydraulic circuit, sequence valves are installed in front of each actuator, and the set pressure of each sequence valve is adjusted. Actuators can be activated.

As described above, in the present invention, by adding the sequence valve 72 to the hydraulic cylinder 70 of the attachment coupler 10, the safety cylinder 110 first prepares the release operation during the release operation of the attachment coupler 10, and then the hydraulic cylinder. Allow 70 to release. That is, by implementing the sequential operation between the automatic safety device cylinder 110 and the hydraulic cylinder 70 to prepare for the release of the automatic safety device cylinder 110 in advance, and then to release the hydraulic cylinder 70 by releasing the automatic safety device cylinder It is possible to prevent an unexpected locking phenomenon that may occur during the rapid contraction of the 110.

Other components shown in FIG. 5 are the same as those of the invention of Patent Application No. 2006-29751 shown in FIG. 2, and thus, further description thereof will be omitted.

6 and 7 are hydraulic circuit diagrams of the attachment coupler 10 for the heavy equipment of FIG. 5, of which FIG. 6 shows a state in which the sequence valve 72 is closed, and FIG. 7 shows a state in which the sequence valve 72 is opened. Illustrated.

The hydraulic circuit diagram of Figure 6 is applied to the sequence valve 72 so that the hydraulic cylinder 70 and the automatic safety device cylinder 110 can be operated in sequence when the attachment coupler for heavy equipment with an improved automatic safety function according to the present invention is released. The configuration shown is shown. Referring to FIG. 6, the attachment coupler for heavy equipment with an improved automatic safety function according to the present invention, the hydraulic pressure generated from the hydraulic pump 350 is passed through the solenoid valve 330, the hydraulic cylinder 70, and the safety device cylinder 110. Is the same as the invention of the prior patent application No. 2006-29751, but specifically, in the hydraulic transmission path between the solenoid valve 330 and the hydraulic cylinder 70 and the automatic safety device cylinder 110, the patent application There is a difference from the invention.

That is, in the present invention, the solenoid valve 330 and the automatic safety device cylinder 110 are connected by the coupler release side hydraulic line 101 and the hydraulic line 320, the solenoid valve 330 and the hydraulic cylinder rod side ( 70a) is to be connected via a sequence valve 72 in the coupler release side hydraulic line 101.

By such a changed configuration, the attachment coupler of the present invention is the hydraulic pressure generated in the hydraulic pump 350 during the release operation via the solenoid valve 330 through the coupler release side hydraulic line 101 and the hydraulic line 320 The hydraulic oil is first supplied to the safety device cylinder 110 to prepare for the release operation. Meanwhile, the hydraulic oil supplied from the coupler release side hydraulic line 101 to the hydraulic cylinder rod side 70a of the sequence valve 72 is removed. When the pressure cannot be supplied until the set pressure is reached (see Fig. 6) and finally becomes higher than the set pressure (see Fig. 7), the sequence valve 72 is opened to supply the hydraulic oil to the hydraulic cylinder rod side 70a. The release (contraction) operation of 70 is performed.

Here, the preparation of the release operation of the failsafe cylinder 110 refers to the unlocking of the failsafe cylinder 110. For the locking and unlocking operation of the failsafe cylinder 110, FIGS. This will be described with reference to 15.

First, when the hydraulic cylinder 70 is to be released (contracted), the hydraulic oil is transferred to the hydraulic cylinder rod side 70a through the hydraulic cylinder release side port (100 in FIG. 5), in which case the hydraulic cylinder disassembly side port 100 ) And the pressure oil is also delivered to the rod 130 of the safety device cylinder 110 is connected to the hydraulic line.

Referring to FIG. 13, the pressurized oil supplied through the hose union 180 coupled to the rod 130 of the failsafe cylinder 110 passes through the inner passage 181 of the cylinder rod 130 and then into the inside. It acts on the tapered space 240 of the second piston 150 through the vertical flow path 181a connected to the flow path 181. When the hydraulic pressure pushes the tapered space 240, the second piston 150 moves to the left in the state shown in FIG. 13 to be in close contact with the first piston 140 as shown in FIG. 14.

As such, the second piston 150 is directed toward the first piston 140 until the second stop 200 of the second piston 150 touches the fourth stop 220 of the first piston 140. In the axial direction, at this time, the steel ball 170 of the second piston 150 is lowered down the hole 171 (that is, the cylinder rod 130 side) so that the safety device cylinder 110 is contracted. This can be done (see Fig. 14).

In this case, since the hydraulic cylinder 70 and the automatic safety device cylinder 110 are fixed together by the same first and second fixing pins 280 and 290 (see FIG. 5), the hydraulic cylinder 70 and the automatic cylinder are automatically released when the hydraulic cylinder 70 is released. The safety cylinder 110 also performs the release operation as well.

However, if the steel balls 170 do not descend below the holes 171 (ie, toward the cylinder rod 130), the steel balls 170 may be angled upon contraction of the failsafe cylinder 110. It is caught by the round processing part 250 of the locking groove 231, so that the safety device cylinder is no longer contracted and locked (see FIG. 13).

6 and 7, reference numeral 72a denotes a bypass line through which pressure oil of the sequence valve 72 is bypassed.

8 is a cross-sectional view showing the operation of the attachment coupler for heavy equipment with an improved automatic safety function according to the present invention, showing the hydraulic cylinder 70 and the safety device cylinder 110 of the attachment coupler 10 is extended together. .

Figure 9 is a cross-sectional view of the safety device cylinder 110 in the contracted state in the attachment coupler for heavy equipment according to the present invention, Figure 10 is a cross-sectional view taken along the line X-X in FIG.

Referring to FIG. 9, a plurality of locking grooves 231 are successively formed on an inner wall of the housing 120 of the failsafe cylinder 110. When the failsafe cylinder 110 extends, the steel balls ( As shown in FIGS. 11 and 12, 170 passes through the locking grooves 231 through and out of the hole 171 through holes 171 formed in the circumferential direction on the surface of the second piston 150. Will pass.

" 형으로 라운드 가공되어 있어 강구(170)가 걸리게 된다. The locking grooves 231 formed on the inner wall of the housing 120 serve as a stopper for locking the failsafe cylinder 110 so that it does not shrink anymore, and the inner shape of each locking groove 231. The surface 230 in the direction in which the cylinder is extended (right in FIG. 9) and the surface 250 in the direction in which the cylinder is contracted (left in FIG. 9) are processed differently. That is, the surface 230 of the locking groove 231 in the direction in which the cylinder is extended may be tapered with a gentle slope so that the steel ball 170 may ride over, but the locking groove 231 in the direction in which the cylinder on the opposite side is contracted. ) Surface 250 has a predetermined radius of curvature.

It is rounded into a shape, and the steel ball 170 is caught.

Meanwhile, referring to FIGS. 9 and 11, first stop jaw 190 and second stop jaw 200 are formed at both ends of the second piston 150, respectively, and the stepped portion of the cylinder rod 130 is formed. A third stop jaw 210 is formed in the second piston 150 to be in contact with the first stop jaw 190 of the second piston 150, and the second piston 150 has a second stop of the second piston 150. A fourth stopper 220 may be formed to be in contact with the stopper 200. 9 and 11, the spring 160 is assembled between the first piston 140 and the second piston 150 coupled to the rod 130 of the failsafe cylinder 110. The second piston 150 until the first stop jaw 190 touches the third stop jaw 210 of the rod 130 and the second stop jaw 200 the first piston 140. It is possible to reciprocate in the axial direction until it reaches the fourth stop (220) of.

The steel balls 170 inserted into the holes 171 formed on the surface of the second piston 150 have a second piston 150 formed on the first piston 140 as shown in FIGS. 9 and 12. The bottom of the hole 171 (ie, in accordance with FIG. 9) or as it is moved in contact with the third stop (210, see FIG. 7A) of the cylinder rod 130 (FIG. 12). , Rod side) (see Fig. 9), or may be pushed up (i.e. housing side) above the hole 171 (see Fig. 12).

In a state where no additional force is applied to the inside of the safety device cylinder 110 from the outside, the second piston 150 is always biased toward the third stop jaw 210 by the spring 160, in this state. When the safety device cylinder 110 is extended, the steel ball 170 is not caught by the locking grooves 231, and thus the cylinder 170 can be stretched by naturally riding the tapered portion 230 (see FIG. 11). . However, on the contrary, when the self-safety cylinder 110 is contracted, the steel ball 170 is caught by the round processing part 250 of the locking grooves 231, so that the cylinder can no longer be contracted and locked in place (see FIG. 13). ).

In FIG. 9, reference numeral 131a represents an inclined portion in front of the third stopping jaw 210 of the rod 130, and 131b represents a flat portion of the inclined portion 131a.

11 and 14, reference numeral 240 denotes a tapered space formed on the inner wall of the second piston 150, and the tapered space 240 is a vertical flow path 181a formed in the cylinder rod 130. Connected to the internal flow path 181, when the pressure is supplied when the attachment coupler is to be released, the pressure acts to push the second piston 150 toward the first piston 140 by the pressure of the pressure (partial enlargement of FIG. 14). See also).

11 and 12 are cross-sectional views illustrating a process of extending the safety device cylinder 110 in the attachment coupler for heavy equipment according to the present invention, and FIGS. 14 and 15 are views in which the safety device cylinder 110 is not locked. Sectional drawing which shows the progress state at the time of contraction in a state. And, Figure 13 shows a state in which the safety device cylinder 110 is locked and no longer contracted in the attachment coupler for heavy equipment according to the present invention.

11 and 12 show when the fail-safe cylinder 110 of the present invention is extended. In this case, since pressure oil is not supplied to the release side port of the hydraulic cylinder, pressure is also applied to the flow paths 181 and 181a in the rod 130. No oil is supplied. Therefore, the second piston 150 is pushed toward the third stop jaw 210 of the rod 130 by the elastic force of the spring 160, the steel ball 170 is the third stop jaw 210 of the rod 130 As it is mounted on the inclined portion 131 immediately forward, it rises into the locking groove 231 of the housing 120. In this way, even when the steel ball 170 is raised inside the locking groove 231, since the tapered portion 230 of the locking groove 231 has a gentle tapered shape, the steel ball 170 passes over the locking groove. I can go. As a result, even if the hydraulic oil is not supplied to the inside of the safety device cylinder 110, the autonomous cylinder cylinder 110 can be extended together when the hydraulic cylinder 70 is extended.

"형으로 라운드된 턱에 걸려 자동안전장치 실린더(110)가 더 이상 수축되지 못한다. However, as shown in FIGS. 13 and 14, the tapered space portion inside the second piston 150 through the inner flow paths 181 and 181a of the cylinder rod 130 when the failsafe cylinder 110 is retracted. The safety device cylinder 110 may be contracted only when pressure oil is supplied to the inner space formed by the 240 and the cylinder rod 130. That is, the pressure oil is supplied into the tapered space 240 of the second piston 150 so that the second piston 150 must move toward the first piston 140 to overcome the elastic force of the spring 160, and thus the steel balls 170 May enter the hole 171 and pass through the locking grooves 231. When the hydraulic oil is not supplied into the tapered space 240, the second piston 150 remains in contact with the third stopper 210, so that the steel ball 170 is formed at the position of the locking grooves 231.

The safety device cylinder 110 can no longer be retracted by being caught in a round jaw.

FIG. 13 shows that the steel ball 170 is not applied when the hydraulic oil is not supplied to the tapered space 240 inside the second piston 150 of the failsafe cylinder 110 (that is, the hydraulic cylinder is abnormally contracted). It shows that the locking groove 231 is caught. On the other hand, FIG. 14 illustrates a case in which pressure oil is supplied to the internal space formed by the tapered space portion 240 and the cylinder rod 130 inside the second piston 150 of the failsafe cylinder 110 (that is, the hydraulic cylinder is When the steel ball 170 enters the inside of the hole 171 in the case where it is normally contracted, it is shown that the contraction of the failsafe cylinder 110 is performed smoothly.

As shown in the hydraulic circuit diagram of the present invention shown in Fig. 6, when the hydraulic oil is supplied to the coupler release side hydraulic line 101 to separate the attachment coupler, the hydraulic cylinder 70 by the sequence valve 72 exhibiting a constant delay effect. Although the hydraulic pressure does not immediately act on the rod side 70a of), the safety device cylinder 110 directly connected by the coupler release side hydraulic line 101 and the hydraulic line 320 is directly acted on the hydraulic pressure. As such, when the pressure oil acts on the tapered space portion 240, the second piston 150 is pushed by the hydraulic pressure to move toward the first piston 140, and as a result, the steel ball 170 moves inside the hole 171. (I.e., the cylinder rod 130 side), the locking state is released first.

Referring to FIGS. 13 and 14, this will be described in more detail. The pressure oil delivered through the coupler release-side hydraulic line 101 and the hydraulic line 320 is formed along the hose union 180 and the internal flow paths 181 and 181a. When introduced into the inner space between the tapered space portion 240 and the cylinder rod 130 of the two piston 150, the second piston 150 is pushed toward the first piston 140 by the pressure of the hydraulic pressure, The second stop 200 of the second piston 150 is transferred in the axial direction (to the left in FIG. 14) until it reaches the fourth stop 220 of the first piston 140.

FIG. 15 is a cross-sectional view of adding a lubrication feed port 270 and an intake and exhaust passage 260 to the failsafe cylinder 110 shown in FIG. 15 is a cross-sectional structure of the failsafe cylinder 110 shown in Figs. 9 to 14, ① the feeder 270 for lubrication is added to the inside of the housing 120 of the failsafe cylinder 110, ② It is characterized in that the air intake and exhaust passage 260 is added to allow the rod 130 to smoothly move in and out of each sealed space inside the elongation or contraction of the automatic safety device cylinder 110.

The attachment coupler for heavy equipment with an improved automatic safety function according to the present invention is improved to enable the invention of patent application No. 2006-29751 filed by the present applicant to operate more smoothly. In particular, the present invention by additionally installing a sequence valve on the hydraulic line is supplied with hydraulic pressure for the release (contraction) of the hydraulic cylinder, the release operation of the automatic safety device cylinder and the release operation of the hydraulic cylinder sequentially during the release operation of the attachment coupler When the attachment coupler is normally disconnected by making it happen, there is an effect of ensuring that the automatic safety device is not locked unnecessarily.

Claims (5)

In the attachment coupler (10) for heavy equipment including a fixed hook (60) and a movable hook (40) and a hydraulic cylinder (70) for moving the movable hook (40) to be engaged with the coupling pins formed in the attachment for construction equipment, One end of the movable hook 40 is hinged to a portion of the body of the coupler 10, the other end of the movable hook 40 is pin-coupled to the hydraulic cylinder 70 and the automatic safety device cylinder 110 at the same time , A hydraulic pump 350 generating hydraulic power for contracting or extending the hydraulic cylinder; A coupler locking side hydraulic line (102) for providing a passage through which hydraulic pressure is transmitted from the hydraulic pump (350) to the cylinder head side (70b) of the hydraulic cylinder (70) for the expansion of the hydraulic cylinder (70); A coupler release providing a passage through which hydraulic pressure is transmitted from the hydraulic pump 350 to the cylinder rod side 70a of the hydraulic cylinder 70 and the automatic safety device cylinder 110 for contraction of the hydraulic cylinder 70. Side hydraulic line 101; And And a sequence valve (72) installed between the coupler release side hydraulic line (101) and the cylinder rod side (70a) of the hydraulic cylinder, and opened only when hydraulic pressure above a predetermined pressure level is applied. The coupler release side hydraulic line 101 branches in front of the sequence valve 72 so that one line is connected to the sequence valve 72 and another line is directly connected to the failsafe cylinder 110. An attachment coupler for heavy equipment with improved auto-safety, characterized in that. According to claim 1, wherein the safety device cylinder 110, Cylinder housing 120; A cylinder rod 130 linearly reciprocating in the cylinder housing 120 and formed to have a small step diameter; A first piston 140 having a through hole formed at a center thereof and having a front end portion of the cylinder rod 130 coupled to the through hole; A through-hole is formed in the center and is fitted to the small diameter portion of the cylinder rod 130, the second piston which is movable between the first piston 140 and the step portion in the state fitted to the cylinder rod 130 ( 150); A spring 160 disposed between the first piston 140 and the second piston 150; A plurality of holes 171 formed in the circumferential direction on the surface of the second piston 150; A plurality of steel balls 170 respectively inserted into the holes 171; And And a plurality of locking grooves (231) formed in the inner wall of the cylinder housing (120). According to claim 2, An inner flow passage 181 is formed in the interior of the cylinder rod 130 along the longitudinal direction, the inner flow passage 181 is a vertical flow passage (181a) to the surface of the cylinder rod 130 Connected to the On the inner wall surface of the second piston 150, a tapered space portion 240 is formed in the circumferential direction at a position that meets the vertical flow passage 181a, The internal flow path 181 of the cylinder rod 130 is connected to the coupler release side hydraulic line 101, and the hydraulic oil supplied from the hydraulic pump 350 only when the hydraulic cylinder 70 is contracted in a normal operation. (Iii) is supplied to the tapered space portion 240 through the inner passage 181 and the vertical passage 181a, attachment coupler for a heavy equipment with an improved automatic safety function. The surface of each of the locking grooves 231 is located in the direction of the direction in which the cylinder rod 130 travels upon contraction of the fail-safe cylinder 110 is rounded to a predetermined radius. round) and the portion 230 located in the direction in which the cylinder rod 130 proceeds when the failsafe cylinder 110 is extended, is tapered. Coupler. According to claim 2, The cylinder housing 120 is characterized in that it further has an intake and exhaust passage 260 connected to the closed space inside the cylinder rod 130 is inserted, for improved heavy safety equipment Attachment Coupler.

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