JP4299748B2 - Attachment for work machine - Google Patents

Description

  The present invention relates to an attachment for a working machine provided with two operation parts driven by hydraulic pressure.

  In order to improve the versatility of the work machine, various work machine attachments can be attached to the arm tip of the work machine. For example, when hitting and crushing hard materials such as concrete and asphalt, a work machine attachment called a breaker is attached, and when excavating ore and earth and sand, a work machine attachment called a bucket is attached. . The work machine attachment is normally driven by hydraulic pressure, and some of them are equipped with two types of hydraulic equipment.

  For example, Patent Document 1 describes a hydraulic breaker with a cutting machine in which a hydraulic cutting machine is attached to a hydraulic breaker (see Claims, FIG. 1). Thereby, it is said that the dismantling work efficiency of a reinforced concrete structure etc. can be improved significantly (refer to [0010]). In this hydraulic breaker with a cutting machine, an electromagnetic switching valve for controlling the hydraulic breaking machine and an electromagnetic switching valve for controlling the hydraulic cutting machine are separately provided (see FIG. 4). The switching of the electromagnetic switching valve is alternately controlled (see [0008]).

  Further, Patent Document 2 describes an attachment device that swings an attachment attached to the tip of an arm of a construction machine by expanding and contracting a swinging cylinder (see claims, [0033], FIG. 4). . Thus, the attachment can be easily and easily adjusted to an appropriate working posture (see [0058]). In this attachment device, the hydraulic circuit that drives the swing cylinder is provided separately from the hydraulic circuit that drives the hydraulic breaker (see [0026], FIG. 3).

Japanese Patent Laid-Open No. 06-240889 JP 2004-052280 A

  However, the hydraulic breaker with a cutting machine of Patent Document 1 and the attachment device of Patent Document 2 are not necessarily easily attachable to a commercially available work machine. The main body of a commercially available work machine is generally provided with a hydraulic port for connection to the work machine attachment in advance, but the hydraulic breaker with a cutting machine of Patent Document 1 and the attachment device of Patent Document 2 This is because both of them occupied two sets (four) of hydraulic ports. For this reason, when there is only one set (two) of hydraulic ports, if the hydraulic breaker with a cutting machine of Patent Document 1 or the attachment device of Patent Document 2 is attached to the work machine, the hydraulic port is attached to the work machine. I had to make some additional modifications.

  Moreover, when attaching the hydraulic breaker with a cutting machine of patent document 1, and the attachment apparatus of patent document 2 to the arm front-end | tip part of a working machine, it is necessary to connect an arm front-end | tip part and a boom base end part with four hydraulic tubes. there were. For this reason, the hydraulic breaker with a cutting machine of patent document 1 and the attachment apparatus of patent document 2 require much work for attachment work and maintenance work because of the large number of hydraulic tubes.

  The present invention has been made in order to solve the above-mentioned problems, and can be easily attached to a commercially available work machine and has a maintenance work while being provided with two operating parts driven by hydraulic pressure. An easy attachment for a work machine is provided.

The above-described problems include a first working part and a second working part that are driven by hydraulic pressure, a first pipe (L ₁₀ ) that supplies working oil to a working oil supply port of the first working part, and a first working part. In the attachment for work machine having the second pipe (L ₂₀ ) for discharging the hydraulic oil from the hydraulic oil outlet of the first hydraulic pipe, the first pipe (L ₁₀ ) is the hydraulic oil supply port of the first operating section. the first branch conduit which is connected to the (L _11), is branched into the second branch conduit and (L ₁₂₎ which is connected to the hydraulic fluid outlet of the second operating unit, a second branch pipe The passage (L ₁₂ ) is provided with a check valve (V ₁ ) for restricting the flow of hydraulic oil from the first pipe (L ₁₀ ) to the second working part, and the second pipe (L ₂₀ ) The third branch line (L ₂₁ ) connected to the hydraulic oil discharge port of the first working part and the fourth branch line (L ₂₂ ) connected to the hydraulic oil supply port of the second working part is branched into bets, the third branch conduit To L _21), solved by providing a check valve (V ₂₎ working machine attachment made provided that the second conduit from (L ₂₀₎ to restrict the flow of hydraulic fluid to the first operating unit Is done. Thereby, it becomes possible to selectively drive the first operating part and the second operating part with one hydraulic system.

  The first operating unit is not particularly limited as long as it is a hydraulic device provided in the work machine attachment. Such hydraulic equipment includes a breaker for hitting and crushing hard materials, a cutting blade for cutting vegetation, etc., a bucket for scooping up earth and sand, a gripping arm for grabbing rocks, a reinforcing bar, etc. Examples include various attachments such as a cutting arm for cutting and a cutting blade for cutting asphalt and concrete. Especially, the hydraulic equipment which repeats operation | movement of 1 degree of freedom periodically is suitable as a 1st action | operation part. In particular, a breaker for hitting and crushing hard materials is suitable as the first operating portion.

  The second operating unit is not particularly limited as long as it is a hydraulic device provided in the work machine attachment and is selectively driven with the first operating unit (it is not necessary to be driven simultaneously with the first operating unit). . Examples of such a hydraulic device include a hydraulic motor and a hydraulic cylinder for changing the mounting direction and mounting angle of the first operating portion with respect to the arm of the work machine. Especially, the hydraulic equipment which performs operation | movement of 1 degree of freedom is suitable as a 2nd action | operation part. In particular, a first working part turning motor (hydraulic motor) for turning the first working part with respect to the arm of the work machine is suitable as the second working part. This configuration is particularly preferable when the first operating portion is a breaker.

  It is also preferable to provide an angle adjusting means for adjusting an angle formed by the first operating part with respect to the arm between the first operating part and the second operating part, and the angle adjusting means has a pair of side walls. A bracket having a bracket, a hinge pin installed between the pair of side walls, and a lock that is fitted into at least one positioning hole among the plurality of positioning holes provided in the pair of side walls to lock the first operating portion. It is more preferable that the angle formed by the first operating portion with respect to the arm can be adjusted by changing a positioning hole into which the lock pin is inserted. Thereby, it becomes possible to change the setting of the angle formed by the first operating part and the arm of the work machine according to the situation, and the work can be performed more efficiently. This configuration is suitable when the breaker is employed as the first operating portion and the first operating portion turning motor is employed as the second operating portion.

  As described above, the attachment for a work machine according to the present invention has only two sets of hydraulic ports provided in the work machine even though it has two operating parts driven by hydraulic pressure. In addition, the attachment for the working machine and the hydraulic port provided in the working machine can be connected by two hydraulic tubes. For this reason, even attachments for work machines with two working parts driven by hydraulic pressure can be easily attached to commercially available work machines, and the maintenance work can be simplified. Can do.

  A preferred embodiment of the work machine attachment of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a right side view showing an entire work machine 200 equipped with the work machine attachment 100 of the present invention. As shown in FIG. 1, the work machine 200 includes a main body part 210 provided with a driver's seat 211 and a traveling body 212, and a work part 220 provided with an arm 221 and a boom 222. The work machine 200 is the same as a commercially available work machine, and is a very common one. In a commercially available work machine, a bucket is often provided as a standard equipment at the tip of the arm, but in this embodiment, the standard equipment bucket is removed, and instead the work machine attachment 100 of the present invention is attached. .

[Work machine attachment]
FIG. 2 is an enlarged right side view of the work machine attachment 100 of the present invention. FIG. 3 is an enlarged rear view of the work machine attachment 100 of the present invention. As shown in FIGS. 2 and 3, the work machine attachment 100 includes a hydraulic breaker 110 and a hydraulic breaker turning motor 120, and has two operation parts driven by hydraulic pressure. It has become. The breaker 110 is used for hitting and crushing hard materials such as concrete and asphalt, and is provided as a first working part. On the other hand, the breaker turning motor 120 is provided as a first operating part turning motor (a subordinate concept of the second operating part) for turning the breaker 110 with respect to the arm 221 (FIG. 1).

Between the breaker 110 and the breaker turning motor 120, as shown in FIGS. 2 and 3, a bracket 130 having a pair of side walls 131 and 132 is disposed. The bracket 130 is provided as angle adjusting means for adjusting the angle formed by the breaker 110 (first operating portion) with respect to the arm 221 (FIG. 1). The base end of the bracket 130 is fixed to an internal gear 150 described later. The side wall 131 is provided with a hinge hole 131H ₁ and positioning holes 131H _{2 to} 131H ₅ , and the side wall 132 has a similar hinge hole 132H ₁ (FIG. 3) and positioning holes 132H ₂ (FIG. 3), 132H. _{3 to} 132H ₅ (not shown) are provided. The positioning holes 131H _{2 to} 131H ₅ are arranged on an arc C ₁ (not shown) centered on the hinge hole 131H _{1. The} positioning holes 132H _{2 to} 132H ₅ are arcs centered on the hinge hole 132H _2. Arranged above C ₂ (not shown). The radius of the arc C ₂ is equal to the radius of the arc C ₁ .

Interval arranging the positioning holes 131H ₂ ~131H ₅ differs depending dimensions of number and bracket 130 to provide a positioning hole 131H ₂ ~131H _5, is not particularly limited, usually, the positioning holes 131H ₂ ~131H _The angle formed by connecting the center of two adjacent positioning holes out of ₅ and the center of the hinge hole 131H ₁ (the center of the hinge hole 131H ₁ is the vertex) is 5 to 90 °. Arranged. If the angle is less than 5 °, the spacing between the positioning holes becomes too narrow, and the strength of the bracket 130 may be significantly reduced. If the angle is greater than 90 °, the breaker 110 This is because the fixed position (the bending angle of the breaker 110 with respect to the arm 221 (FIG. 1)) may not be adjusted in small increments. The size of the corner is 30 ° in this embodiment. The intervals at which the positioning holes 132H _{2 to} 132H ₅ are arranged are the same as those of the positioning holes 131H _{2 to} 131H ₅ .

As shown in FIG. 3, a hinge pin 133 is inserted and fixed in the hinge holes 131H ₁ and 132H ₁ , and the hinge pin 133 is installed between the side wall 131 and the side wall 132. . The hinge pin 133 is also inserted into hinge holes 113H ₁ and 113H ₂ described later. On the other hand, a lock pin 134 is inserted and fixed in the positioning holes 131H ₂ and 132H ₂ . The lock pin 134 is also inserted into lock holes 113H ₃ and 113H ₄ described later. Therefore, the breaker 110 is in a state of being fixed with respect to the bracket 130. Like the bracket 130, the hinge pin 133 and the lock pin 134 are provided as angle adjusting means for adjusting the angle formed by the breaker 110 (first operating portion) with respect to the arm 221 (FIG. 1). When the lock pin 134 is removed from the lock holes 113H ₃ and 113H ₄ , the state becomes possible to swing about the hinge pin 133. As shown by the phantom line (two-dot chain line) in FIG. 2, the breaker 110 can adjust the fixing position stepwise by switching the positioning hole into which the lock pin 134 is inserted.

[breaker]
As shown in FIG. 3, the breaker 110 includes a chisel 111 for hitting and crushing hard materials such as concrete and asphalt, a chisel vibration cylinder 112 for vibrating the chisel 111, and a chisel vibration cylinder 112. It consists of a jaw 113 for connecting to. The chisel 111 is housed in the chisel vibration cylinder 112 at its base end, and reciprocates when hydraulic oil is supplied to the chisel vibration cylinder 112 (the hydraulic oil supply port 110P ₁ (FIG. 4) of the breaker 110). It moves (vibrates). The chisel vibration cylinder 112 is fixed inside the jaw 113. Hinge holes 113H ₁ and 113H ₂ are provided at the base end of the jaw 113, and a hinge pin 133 is inserted into the hinge holes 113H ₁ and 113H ₂ with play. The jaw 113 is provided with lock holes 113H ₃ and 113H _{4 at a} predetermined distance from the hinge holes 113H ₁ and 113H ₂ , and a lock pin 134 is inserted into the lock holes 113H ₃ and 113H ₄ . . The distances from the hinge holes 113H ₁ and 113H ₂ to the lock holes 113H ₃ and 113H ₄ are equal to the radii of the arcs C ₁ and C ₂ (see [0016]).

[Breaker turning motor]
As shown in FIG. 2, the breaker turning motor 120 is housed and fixed inside the arm mounting portion 140. The arm attachment portion 140 is provided to attach the work machine attachment 100 to the tip of the arm 221 (FIG. 1). The breaker turning motor 120 rotates when the working oil is supplied to the working oil supply port 120P ₁ (FIG. 4), and rotates the external gear 121 connected to the breaker turning motor 120. The external gear 121 is arranged so that the teeth provided on the outer peripheral surface thereof mesh with the teeth provided on the inner peripheral surface of the internal gear 150. Therefore, when the breaker turning motor 120 rotates, the internal gear 150 rotates in conjunction with the external gear 121, and the breaker 110 turns with respect to the arm 221 (FIG. 1).

[Hydraulic circuit]
Next, the hydraulic circuit 300 that drives the work machine attachment 100 of the present invention will be described. FIG. 4 is a hydraulic circuit diagram showing a hydraulic circuit 300 for driving the work machine attachment 100 of the present invention. Of the hydraulic circuit 300, the first hydraulic circuit 310 is provided in the main body 210 (FIG. 1) of the work machine 200, and the second hydraulic circuit 320 is provided in the work machine attachment 100 (FIG. 1). It is a thing. As shown in FIG. 4, the first hydraulic circuit 310 and the second hydraulic circuit 320 are connected via two parallel pipelines 330 and 331. One end of the pipe 330 is connected to the hydraulic port 210P ₁ provided in the main body 210 of the work machine 200 (FIG. 1), and the other end is connected to the hydraulic port 100P ₁ provided in the work machine attachment 100 (FIG. 1). It is connected to the. Further, the conduit 331 has one end connected to the hydraulic port 210P ₂ provided in the main body portion 210 of the work machine 200, the other end is connected to the hydraulic port 100P ₂ provided in the work machine attachment 100.

[First hydraulic circuit]
First, the first hydraulic circuit 310 will be described. The first hydraulic circuit 310 selectively sends hydraulic oil from the pair of hydraulic ports 210P ₁ and 210P ₂ . The first hydraulic circuit 310 is a standard hydraulic circuit provided in advance on a commercially available work machine, assuming that the swinging direction of a bucket or the like is reversed. The work machine attachment 100 of the present invention uses the first hydraulic circuit 310 to selectively operate the breaker 110 (first operating part) and the breaker turning motor 120 (second operating part). .

The first hydraulic circuit 310 is not limited as long as the hydraulic oil can be selectively sent from the pair of hydraulic ports 210P ₁ and 210P ₂ , but in this embodiment, the hydraulic oil is stored as shown in FIG. A tank 311 for pumping, a pump 312 for sucking up hydraulic oil from the tank 311, a switching valve 313 for switching the flow path of hydraulic oil drawn up from the pump 312, and pipe lines 314 to 318. . Conduit 314 has one end connected to the actuating Yuso outlet 311P ₁ of the tank 311 and the other end connected to the hydraulic oil supply port 312P ₁ of the pump 312. Conduit 315 has one end connected to the hydraulic fluid discharge port 312P ₂ pump 312, the other end is connected to the P port (pressure port) 313p ₁ of the switching valve 313. One end of the pipe 316 is connected to the hydraulic oil return port 311P ₂ of the tank 311 and the other end is connected to the R port (return port) 313P ₂ of the switching valve 313. Conduit 317 has one end connected to the A port 313p ₃ of the switching valve 313 and the other end connected to the hydraulic port 210P _1. Conduit 318 has one end connected to the B port 313p ₄ of the switching valve 313 and the other end connected to the hydraulic port 210P _2.

The switching valve 313 is not particularly limited as long as the hydraulic oil can be selectively sent out from the A port 313P ₃ or the B port 313P _4, but in this embodiment, as shown in FIG. Port 3 position valve. In the switching valve 313, when the valve is in one offset position, the P port 313P ₁ and the A port 313P ₃ , and the R port 313P ₂ and the B port 313P ₄ are communicated with each other. When the valve is in the other offset position, the P port 313P ₁ and the B port 313P ₄ , and the R port 313P ₂ and the A port 313P ₃ communicate with each other (hereinafter referred to as “communication state”). This state is sometimes called a cross communication state.) When the valve is in the neutral position, the P port 313P ₁ , the R port 313P ₂ , the A port 313P ₃ and the B port 313P ₄ are all shut off. The position of the switching valve 313 can be switched and controlled by operating a button, lever or the like (not shown) provided in the driver's seat 211 of the work machine 200 (FIG. 1).

[Second hydraulic circuit]
Next, the second hydraulic circuit 320 will be described. The second hydraulic circuit 320, as shown in FIG. 4, a breaker 110, a breaker swing motor 120, a line L _10, has assumed that a line L _20. Line L ₁₀ has one end connected to the hydraulic port 100P _1, the other end is branched into a branch line L ₁₁ and the branch line L _12. Branch line L ₁₁ is connected to the hydraulic oil supply port 110P ₁ breaker 110, branch line L ₁₂ is connected to the hydraulic fluid discharge port 120P ₂ breaker swing motor 120. On the other hand, line L ₂₀ has one end connected to the hydraulic port 100P _2, the other end is branched into a branch line L ₂₁ and the branch line L _22. Branch line L ₂₁ is connected to the hydraulic fluid discharge port 110P ₂ breaker 110, branch line L ₂₂ is connected to the hydraulic oil supply port 120P ₁ breaker swing motor 120.

The branch line L _12, as shown in FIG. 4, the check valve V ₁ is provided such that a direction from the breaker rotation motor 120 to the branch point J ₁ as a forward. Therefore, the operating oil flowing through the second hydraulic circuit 320, the hydraulic oil discharge port 120P ₂ breaker swing motor 120 can flow to the branch point J _1, breaker turning motor 120 from the branch point J ₁ the hydraulic oil outlet 120P ₂ so that the can not flow. On the other hand, a check valve V ₂ is provided in the branch pipe L ₂₁ with the direction from the breaker 110 toward the branch point J ₂ as the forward direction. Therefore, the operating oil flowing through the second hydraulic circuit 320, which can flow from the hydraulic fluid discharge port 110P ₂ breaker 110 to the branch point J _2, hydraulic oil outlet breaker 110 from the branch point J ₂ 110P ₂ Can not flow. In the present embodiment, hydraulic oil throttle valve V ₃ for adjusting the flow rate of the hydraulic oil supplied to the breaker 110 is provided in the branch line L _11, supplied to the breaker rotation motor 120 A throttle valve V ₄ for adjusting the flow rate is provided in the branch line L ₂₂ .

[Operating principle of hydraulic circuit]
Next, the operation principle of the hydraulic circuit 300 will be described. First, the case where the switching valve 313 is in a straight communication state (see [0024]) will be described. The hydraulic oil sucked up from the hydraulic oil outlet 311P ₁ of the tank 311 by the pump 312 passes through the switching valve 313 and is connected to the hydraulic port 210P ₁ provided in the main body 210 of the work machine 200 (FIG. 1). Sent to 330. Hydraulic oil delivered to the conduit 330 is introduced into the work from the hydraulic port 100P ₁ mechanical attachment 100 (Fig. 1), flows through the pipe L _10. Hydraulic oil flowing in the conduit L ₁₀ is eventually reaches the branch point J _1. The hydraulic oil that has reached the branch point J ₁ cannot flow into the branch line L ₁₂ by the check valve V ₁ , and therefore flows only into the branch line L ₁₁ . Hydraulic oil flowing through the branch conduit L ₁₁ is regulated the flow rate by the throttle valve V ₃ is supplied to the breaker 110 from the working oil supply port 110P _1.

Hydraulic oil supplied to the breaker 110, after the hydraulic driving the breaker 110 is lowered, it is discharged from the hydraulic oil discharge port 110P ₂ to branch line L _21. Hydraulic oil discharged to the branch pipe L ₂₁ is a check valve V ₂ through the forward direction to reach the branch point J _2. At this time, the hydraulic oil flows into the branch line L ₂₂ from the branch point J _2, there is a risk of operating the breaker swing motor 120 is false, the hydraulic pressure of the branching point J ₁ is higher than the hydraulic pressure of the branching point J ₂ Since the check valve V ₁ is closed, the hydraulic oil that has reached the branch point J ₂ cannot flow into the branch line L ₂₂ . Accordingly, the hydraulic oil that has reached the branch point J ₂ flows to one end side (not branched side) of the pipe L ₂₀ and is discharged from the hydraulic port 100P ₂ to the outside of the work machine attachment 100 (FIG. 1). The Hydraulic oil discharged to the outside of the work machine attachment 100 flows through conduit 331 and is introduced into the body portion 210 of the work from the hydraulic port 210P ₂ machine 200 (Figure 1). Hydraulic oil introduced into the main body portion 210, flows through the conduit 318, after passing through the switching valve 313, is fed back from the hydraulic fluid return port 311P ₂ to the tank 311.

Next, the case where the switching valve 313 is in the cross communication state (see [0024]) will be described. Hydraulic oil sucked up from the working Yuso outlet 311P ₁ of the tank 311 by the pump 312 passes through the switching valve 313, the work machine 200 line from the hydraulic port 210P ₂ provided in the main body portion 210 (FIG. 1) Sent to 331. Hydraulic oil delivered to the conduit 331 is introduced into the work from the hydraulic port 100P ₂ mechanical attachment 100 (Fig. 1), flows through the conduit L _20. Hydraulic oil that flows through the pipe L ₂₀ is eventually reaches the branching point J _2. The hydraulic oil that has reached the branch point J ₂ cannot flow into the branch line L ₂₁ by the check valve V ₂ , and therefore flows only into the branch line L ₂₂ . Hydraulic oil flowing through the branch line L ₂₂ has its flow rate by the throttle valve V ₄ is adjusted, it is supplied to the breaker rotary motor 120 from the hydraulic fluid supply opening 120P _1.

Hydraulic oil supplied to the breaker rotation motor 120, after the hydraulic drives the breaker swinging motor 120 is lowered, it is discharged from the hydraulic oil discharge port 120P ₂ to branch line L _12. Hydraulic oil discharged to the branch pipe L ₁₂ is a check valve V ₁ through a forward reaching the branch point J _1. At this time, the hydraulic oil flows into the branch line L ₁₁ from the branch point J _1, there is a possibility that the breaker 110 is malfunctioning, the oil pressure of the branching point J ₂ are higher than the hydraulic pressure of the branching point J ₁ Since the check valve V ₂ is closed, the hydraulic oil that has reached the branch point J ₁ cannot flow into the branch pipe L ₁₁ . Accordingly, the hydraulic oil that has reached the branch point J ₁ flows to one end side (not branched side) of the pipe L ₁₀ and is discharged from the hydraulic port 100P ₁ to the outside of the work machine attachment 100 (FIG. 1). The Hydraulic oil discharged to the outside of the work machine attachment 100 flows through conduit 330 and is introduced into the body portion 210 of the work from the hydraulic port 210P ₁ machine 200 (Figure 1). Hydraulic oil introduced into the main body portion 210, flows through the conduit 317, after passing through the switching valve 313, is fed back from the hydraulic fluid return port 311P ₂ to the tank 311.

As described above, the hydraulic circuit 300 can selectively drive the breaker 110, which is the first operating portion, and the breaker turning motor 120, which is the second operating portion, by switching the position of the switching valve 313. It has become a thing. Therefore, the work machine attachment 100 has two sets of hydraulic ports provided in the main body 210 of the work machine 200 (hydraulic ports 210P ₁ , 210P ₂ ), while having two drive parts driven by hydraulic pressure. Only two). Further, the work machine attachment 100 can be connected to the main body 210 of the work machine 200 by two hydraulic tubes.

It is the right view which showed the whole working machine with which the attachment for working machines of this invention was mounted | worn. It is the right view which expanded the attachment for work machines of this invention. It is the rear view to which the attachment for work machines of the present invention was expanded. 1 is a hydraulic circuit diagram illustrating a hydraulic circuit for driving an attachment for a work machine according to the present invention.

Explanation of symbols

100 Work Machine Attachment 100P ₁ , 100P ₂ Hydraulic Port 110 Breaker (First Actuator)
110P ₁ hydraulic oil supply port 110P ₂ hydraulic oil discharge port 111 chisel 112 chisel vibration cylinder 113 jaw 113H ₁ , 113H ₂ hinge hole 113H ₃ , 113H ₄ lock hole 120 breaker turning motor (second operation part)
120P ₁ hydraulic oil supply port 120P ₂ hydraulic oil discharge port 121 external gear 130 bracket (angle adjusting means)
131 Side wall 131H ₁ hinge hole 131H _{2 to} 131H ₅ positioning hole 132 Side wall 132H ₁ hinge hole 132H ₂ positioning hole 133 Hinge pin (angle adjusting means)
134 Lock pin (angle adjustment means)
140 arm mounting 150 within gear 200 work machine 210 main body portion 210P _1, 210P ₂ hydraulic pressure port 211 the driver's seat 212 running body 220 working portion 221 the arm 222 boom 300 hydraulic circuit 310 first hydraulic circuit 311 tank 311P ₁ operating Yuso outlet 311P ₂ Hydraulic oil return port 312 Pump 312P ₁ Hydraulic oil supply port 312P ₂ Hydraulic oil discharge port 313 Switching valve 313P ₁ P port (pressure port)
313P ₂ R port (return entrance)
313P ₃ A port 313P ₄ B ports 314 to 318 Pipe line 320 Second hydraulic circuit 330, 331 Pipe line J ₁ , J ₂ branch point L ₁₀ pipe line (first pipe line)
L ₁₁ branch pipeline (first branch pipeline)
L ₁₂ branch pipeline (second branch pipeline)
L ₂₀ pipeline (second pipeline)
L ₂₁ branch pipeline (third branch pipeline)
L ₂₂ branch pipeline (fourth branch pipeline)
V ₁ , V ₂ check valve V ₃ , V ₄ throttle valve

Claims (5)

A first working part and a second working part driven by hydraulic pressure, a first pipe (L ₁₀ ) for supplying the working oil to the working oil supply port of the first working part, and a working oil discharge of the first working part; In an attachment for a work machine having a second pipe (L ₂₀ ) that discharges hydraulic oil from the outlet, the first pipe (L ₁₀ ) is connected to the hydraulic oil supply port of the first working part. a first branch conduit (L _11), is branched into the second branch conduit and (L ₁₂₎ which is connected to the hydraulic fluid outlet of the second operating unit, a second branch conduit (L ₁₂ ) Is provided with a check valve (V ₁ ) for restricting the flow of hydraulic oil from the first pipe (L ₁₀ ) to the second working part, and the second pipe (L ₂₀ ) Branched into a third branch line (L ₂₁ ) connected to the hydraulic oil discharge port of the working part and a fourth branch line (L ₂₂ ) connected to the hydraulic oil supply port of the second working part Te, the third branch conduit (L _21), Second conduit (L ₂₀₎ from the check valve to restrict the flow of hydraulic fluid to the first operating portion (V ₂₎ a working machine for attachment is provided.   The work machine attachment according to claim 1, wherein the first operating part is a breaker for hitting and crushing hard materials. The work machine attachment according to claim 1 or 2, wherein the second operation part is a first operation part turning motor for turning the first action part with respect to the arm of the work machine. The work according to any one of claims 1 to 3, wherein an angle adjusting means for adjusting an angle formed by the first operating part with respect to the arm of the work machine is provided between the first operating part and the second operating part. Attachment for machine.   The angle adjusting means is inserted into at least one positioning hole among a bracket having a pair of side walls, a hinge pin installed between the pair of side walls, and a plurality of positioning holes provided in the pair of side walls. The work machine according to claim 4, further comprising: a lock pin that locks the first operating portion, and an angle formed by the first operating portion with respect to the arm can be adjusted by changing a positioning hole into which the lock pin is inserted. Attachment for.

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