JP6729936B2 - Multi-motion attachment for construction machinery - Google Patents

Description

The present invention relates to a combined operation type attachment of a construction machine, in which a hydraulic linear motion cylinder, which is one of the two actuators, reaches a working end, and then a hydraulic rotary motor or a hydraulic linear motion cylinder, which is the other of the actuators, starts to operate.

After the hydraulic linear motion cylinder that is one of the two actuators reaches the working end , the hydraulic rotary motor or hydraulic linear motion cylinder that is the other of the actuators starts to operate. Two different operations can be performed. For example, in Patent Document 1, one is a hydraulic direct-acting cylinder and the other is a hydraulic rotary motor, and when the rod of the hydraulic direct-acting cylinder is fully contracted to fully open the crush claw, oil starts to flow to the hydraulic rotary motor and the main body turns. A crushing attachment is disclosed (Patent Document 1, [Claim 1], etc.). The combined operation type attachment disclosed in Patent Document 1 achieves continuous opening and closing of the crushing claw and rotation of the main body, and has an effect of providing easy and good operability (Patent Document 1 effect])

JP 2000-027239

The combined operation type attachment disclosed in Patent Document 1 is a branch that feeds oil to a hydraulic rotary motor by configuring a hydraulic circuit using switching valves that are all hydraulically actuated while considering backflow prevention at the branching portion of the pipe. The piping was limited, and the branch specified the timing of sending oil to the transfer. For this reason, for example, there is a problem in that the crushing claw is closed and the main body is rotated, and the rotation direction of the main body cannot be reversed. Therefore, in the combined operation type attachment of the construction machine, while increasing the timing of switching from the hydraulic direct acting cylinder which is one of the actuators to the hydraulic rotary motor or the hydraulic direct acting cylinder which is the other of the actuators , the hydraulic rotary motor which is the other of the actuators or We examined a configuration that does not impose any restrictions on the operation of the hydraulic linear cylinder .

As a result of the study, it is a combined operation type attachment of a construction machine in which a hydraulic rotary motor or a hydraulic direct drive cylinder which is the other of the actuators starts to operate after the hydraulic direct drive cylinder which is one of the two actuators reaches an operating end. A bridge circuit is provided across two main pipes connected to one of the actuators, and two branch pipes connected to the other of the actuators are connected to the high-voltage side and the low-voltage side of the bridge circuit, respectively. A switching valve is provided so as to switch the circulation or cutoff of oil in each of the two branch pipes, and a hydraulic power generation motor is provided as a bypass pipe connecting the two branch pipes near the bridge circuit from the electromagnetic switching valve. A multi-action attachment of a construction machine has been developed, in which a valve control unit is provided, which is directly fed from a generator rotated by the hydraulic power generation motor and is connected to an electromagnetic switching valve by an operation line.

For example if one hydraulic linear cylinder actuator, a combination other actuator is a hydraulic rotary motor is typically an attachment or gripping provided in the main body to rotate the pair of gripping claws, the body that rotates the pair of crushing claw The provided crushing attachment can be configured. Further, since it suffices that one of the actuators has an actuating end, one and the other of the actuators may both be hydraulic direct-acting cylinders.

As seen in Patent Document 1, when the other of the actuators is a hydraulic rotary motor or a single-acting hydraulic direct-acting cylinder, the electromagnetic switching valve is provided so as to switch the flow or cutoff of oil in each branch pipe. It may be a two-position switching valve that switches between and. However, if the direction of rotation of the hydraulic rotary motor is switched or the other of the actuators is a hydraulic direct-acting cylinder that moves backward, the electromagnetic switching valve will switch the parallel position, the disconnecting line, and the crossing position. Valve. The electromagnetic switching valve, which is a three-position switching valve, can easily switch the pipeline to three ways without requiring complicated hydraulic piping. The valve control unit may be connected to the valve operation unit in the driver's seat by wire or wirelessly.

The combined operation type attachment of the present invention can send oil to the branch pipe through the bridge circuit as long as a high pressure is generated in any of the main pipes connected to the hydraulic linear cylinder that is one of the actuators . This means increasing the timing of switching from the hydraulic direct acting cylinder which is one of the actuators to the hydraulic rotary motor or hydraulic direct acting cylinder which is the other of the actuators. For example one hydraulic linear cylinder actuator, when the other actuator is gripping the attachment is a hydraulic rotary motor, if the state of the hydraulic linear cylinder is closed state or open the claws gripping by stretching or degenerated rod In any case, it is possible to obtain the effect of improving the operability of rotating the main body. A similar type of operability can be expected for a combined motion type attachment in which the other of the actuators is a hydraulic direct acting cylinder.

Further, in the combined operation type attachment of the present invention, the electromagnetic switching valve can be switched by electricity generated by the oil sent from the bridge circuit to control the oil to the hydraulic rotary motor or the hydraulic direct acting cylinder which is the other of the actuators . For example one hydraulic linear cylinder actuator, when the other actuator is gripping the attachment is a hydraulic rotary motor, even in a state where the hydraulic linear cylinder is closed state or open the claws gripping by stretching or degenerated rod , And the effect of improving operability that allows the main body to be rotated or stopped can be obtained. A similar type of operability can be expected for a combined motion type attachment in which the other of the actuators is a hydraulic direct acting cylinder.

In addition to increasing the timing of switching from the hydraulic direct acting cylinder that is one of the actuators to the hydraulic rotary motor or hydraulic direct acting cylinder that is the other of the actuators, if the electromagnetic switching valve is a three-position switching valve, the operation of the other actuator is limited. Is not required. For example one hydraulic linear cylinder actuator, when the other actuator is gripping the attachment is a hydraulic rotary motor, even in a state where the hydraulic linear cylinder is closed state or open the claws gripping by stretching or degenerated rod It is possible to select whether to rotate or stop the main body, and also to select the rotation direction, thereby improving the operability. A similar type of operability can be expected for a combined motion type attachment in which the other of the actuators is a hydraulic direct acting cylinder.

While hydraulic linear cylinder actuator is a block diagram showing an example of a hydraulic circuit combined operation type attachment to the structure of the present invention other actuator is a hydraulic rotary motor. It is a block diagram showing the state which has extended the rod of the hydraulic direct-acting cylinder in the hydraulic circuit which the compound action type attachment of this example comprises. FIG. 6 is a block diagram showing a state in which a switching signal for switching an electromagnetic switching valve to a parallel pipeline is transmitted when the rod of the hydraulic direct-acting cylinder is extended in the hydraulic circuit configured by the combined operation type attachment of the present example. It is a block diagram showing the state where the rod of the hydraulic direct-acting cylinder reached the working end on the extension side in the hydraulic circuit configured by the combined operation type attachment of the present example. A block diagram showing a state in which a switching signal for switching the electromagnetic switching valve to a parallel pipe is transmitted when the rod of the hydraulic direct-acting cylinder reaches the working end on the extension side in the hydraulic circuit configured by the combined operation type attachment of the present example. Is. A block diagram showing a state in which a switching signal for switching an electromagnetic switching valve to a cross pipe is transmitted when a rod of a hydraulic direct-acting cylinder reaches an operating end on an extension side in a hydraulic circuit configured by a composite operation type attachment of this example. Is. It is a block diagram showing the state where the rod of the hydraulic direct-acting cylinder is contracted in the hydraulic circuit configured by the combined motion type attachment of the present example. FIG. 6 is a block diagram showing a state in which a rod of a hydraulic direct-acting cylinder has reached an operation end on a retracted side in a hydraulic circuit configured by a combined operation type attachment of the present example. A block diagram showing a state in which a switching signal for switching an electromagnetic switching valve to a parallel pipe is transmitted when a rod of a hydraulic direct-acting cylinder reaches an operating end on the retracted side in a hydraulic circuit configured by a composite operation type attachment of this example. Is. It is a block diagram showing an example of a hydraulic circuit which a compound operation type attachment of the present invention in which one side and the other side of an actuator are both hydraulic direct acting cylinders.

Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. The composite operation type attachment 1 of the present invention is configured as shown in FIG. 1 when applied to a crushing attachment provided on a rotating body (not shown) with a pair of crushing claws (not shown) (in the figure) The one-dot chain line frame is a compound movement attachment 1). The crushing attachment extends the rod 21 of the hydraulic linear cylinder 2 which is one of the actuators to close the crushing claw, and contracts the rod 21 to open the crushing claw. When the present invention is applied, when the crushing claw is fully opened or fully closed, oil is further continuously fed, and the electromagnetic switching valve 35 is switched to flow oil to the hydraulic rotary motor 3 which is the other of the actuators to rotate the main body.

The hydraulic direct-acting cylinder 2 that opens and closes the crushing claw is a return type, and when the bottom side main pipe 23 is connected to a pump (not shown) and oil is fed, the rod 21 is extended from the tube 22 to extend, When the main pipe 24 is connected to a pump (not shown) and oil is sent in, the rod 21 is housed in the tube 22 and contracted. Depending on the structure of the crushing claws, the hydraulic direct-acting cylinders 2 may be used in pairs. In this case, the bottom side main pipe 23 and the rod side main pipe 24 are branched so that the two hydraulic direct acting cylinders 2 are operated in parallel.

In the present invention, the bridge circuit 25 is provided across the bottom side main pipe 23 and the rod side main pipe 24. The bridge circuit 25 is a hydraulic circuit in which the high-pressure side output end H and the low-pressure side input end L are determined regardless of the direction of the oil flowing through the bottom side main pipe 23 and the rod side main pipe 24. The bridge circuit 25 of this example branches the bottom side main pipe 23 into the bottom side feed pipe 251 and the bottom side return pipe 255, and the rod side main pipe 24 into the rod side feed pipe 253 and the rod side return pipe 257. Then, the bottom side feed pipe 251 and the rod side feed pipe 253 are connected to form a high pressure side output end H, and the bottom side return pipe 255 and the rod side return pipe 257 are connected to form a low pressure side input end L. Constitute.

The bottom side feed pipe 251 is provided with a bottom side feed valve 252 that is a check valve that opens in the direction in which oil flows to the high pressure side output end H, and the rod side feed pipe 253 also has a direction in which oil flows to the high pressure side output end H. A rod side feed valve 254, which is a check valve that opens at the bottom, is provided. In addition, the bottom side return pipe 255 is provided with a bottom side return valve 256 which is a check valve that opens in the direction in which oil flows from the low pressure side input end L, and the rod side return pipe 257 also receives oil from the low pressure side input end L. A rod-side return valve 258, which is a check valve that opens in the flowing direction, is provided.

The bridge circuit 25 opens the bottom side feed valve 252 by the hydraulic pressure and opens the bottom side return valve 255 when, for example, the rod 21 of the hydraulic linear cylinder 2 reaches the working end on the extension side and the hydraulic pressure of the bottom side main pipe 23 increases. Close. The rod side feed valve 254 and the rod side return valve 258 are free. As a result, the oil sent to the bottom side main pipe 23 flows into the high pressure side upstream branch pipe 33 from the high pressure side output end H via the bottom side feed valve 252, and closes the rod side feed valve 254. Then, the oil flowing from the low pressure side upstream branch pipe 34 to the low pressure side input end L avoids the closed bottom side return valve 256, opens the rod side return valve 258, and returns to the rod side pipe 24.

Contrary to the above, the bridge circuit opens the rod side feed valve 254 by the hydraulic pressure when the rod 21 of the hydraulic direct acting cylinder 2 reaches the retracted side operation end and the hydraulic pressure of the rod side main pipe 23 increases, and returns to the rod side return. Close valve 258. The bottom feed valve 252 and bottom return valve 256 are free. As a result, the oil sent to the rod-side main pipe 24 flows into the high-pressure upstream branch pipe 33 from the high-pressure side output end H via the rod-side feed valve 254 and closes the bottom-side feed valve 252. Then, the oil flowing from the low pressure side upstream branch pipe 34 to the low pressure side input end L avoids the closed rod side return valve 258, opens the bottom side return valve 256, and returns to the bottom side pipe 23.

The hydraulic rotary motor 3 for rotating the main body includes a high pressure side downstream branch pipe 31 and a low pressure side downstream branch pipe 32, a high pressure side upstream branch pipe 33 and a low pressure side upstream branch pipe 35 extending from the bridge circuit 25, and an electromagnetic switching valve 35. Connect through. The high-pressure side downstream branch pipe 31 and the low-pressure side downstream branch pipe 32 have essentially no difference between high pressure and low pressure, but the high-pressure side upstream branch pipe 33 and the low-pressure side upstream branch pipe connected by the parallel pipe line 352 of the electromagnetic switching valve 35. In accordance with 35, it is referred to as "high pressure side" or "low pressure side" for convenience. The hydraulic rotary motor 3 rotates normally (clockwise in the drawing) when oil flows in from the high pressure side downstream branch pipe 31, and reversely rotates (clockwise in the drawing) when oil flows in from the low pressure side downstream branch pipe 32.

The electromagnetic switching valve 35 is a three-position switching valve having a parallel conduit 352 on the left side and a crossing conduit 353 on the right side across a cutting conduit 351 in the left and right center of the drawing. The electromagnetic switching valve 35 is moved to the right in the drawing by a solenoid that receives an operation signal from the valve control unit 11 through the parallel conduit switching operation line 111, and connects the high pressure side downstream branch pipe 31 and the high pressure side upstream branch pipe 33. Further, the low pressure side downstream branch pipe 32 and the low voltage side upstream branch pipe 35 are connected. Further, the electromagnetic switching valve 35 is moved to the left in the drawing by a solenoid that receives an operation signal from the valve control unit 11 through the crossing pipeline switching operation line 112, and connects the high pressure side downstream branch pipe 31 and the low pressure side upstream branch pipe 35. Also, the low-pressure side downstream branch pipe 32 and the high-pressure side upstream branch pipe 33 are connected.

When the valve control unit 11 receives an operation signal from the valve operation unit 12 while being supplied with power from the generator 41, the valve control unit 11 receives the operation signal from the parallel pipe line switching operation line 111 or the crossing pipe line switching operation line 112 according to the operation signal. An operation signal is transmitted to the electromagnetic switching valve 35. The parallel line switching operation line 111 or the crossing line switching operation line 112 may be wireless, but is preferably wired from the viewpoint of reliability because they are housed in the same combined operation type attachment 1. On the other hand, since the valve operating unit 12 is normally installed in the driver's seat and is apart from the valve control unit 11, it may be difficult to connect by wire, and it is preferable to connect wirelessly as in this example. ..

The bypass pipe 43 connecting the high-pressure side upstream branch pipe 33 and the low-pressure side upstream branch pipe 34 is provided with a throttle resistor 431, a sequence valve 432, and a hydraulic power generation motor 4 in the order described above from the high-pressure side upstream branch pipe 33 side. The throttle resistance 431 limits the amount of oil flowing into the bypass pipe 43, and when the high-pressure side upstream branch pipe 33 and the high-pressure side downstream branch pipe 31 or the low-pressure side downstream branch pipe 32 are connected, oil is also fed to the hydraulic power generation motor 4. While allowing the oil to flow, a suitable amount of oil also flows to the hydraulic rotary motor 3. The sequence valve 432 shuts off the bypass pipe 43 when oil is not flowing through the high pressure side upstream branch pipe 33.

The hydraulic power generation motor 4 rotates to the right in the drawing when oil flows through the bypass pipe 43, and rotates the generator 41 connected to the rotary shaft to generate electric power. The electricity generated by the generator 41 is supplied to the valve control unit 11 through the power supply line 42. The valve control unit 11 operates only while power is being supplied from the generator 41. As described above, the hydraulic power generation motor 4 serves as a switch of the valve control unit 11. From this, it is possible to operate the valve control unit 11 to move the electromagnetic switching valve 35 and rotate the hydraulic rotary motor 3 because the rod 21 of the hydraulic direct-acting cylinder 2 reaches the working end on the extension side or the contraction side. Also continues to supply oil, and only when the hydraulic power generation motor 4 is rotated.

The opening and closing of the crushing claw and the rotation of the main body in the crushing attachment which is the combined motion type attachment 1 of this example will be described (see FIGS. 2 to 9). When closing the crushing claw, as shown in FIG. 2, the rod 21 of the hydraulic linear motion cylinder 2 is extended. Therefore, the pump is connected to the bottom side main pipe 23, and the oil is supplied. The rod-side main pipe 24 is connected to a tank, and the oil discharged from the hydraulic direct-acting cylinder 2 is returned to the tank. While the rod 21 extends, the oil does not have a high pressure and is not sent out from the bridge circuit 25 to the high pressure side upstream branch pipe 23. This means that the generator 41 does not generate power and the valve control unit 11 does not operate.

Therefore, while the rod 21 of the hydraulic direct-acting cylinder 2 is being extended, as shown in FIG. 3, even if an operation signal is transmitted from the valve operating unit 12 to the valve control unit 11, the valve control unit 11 operates. Without doing so, the electromagnetic switching valve 35 does not switch. Since the electromagnetic switching valve 35 does not switch, both the high-pressure side downstream branch pipe 31 and the low-pressure side downstream pipe 32 connected to the hydraulic rotary motor 3 are closed to brake the hydraulic rotary motor 3. This eliminates the risk that the main body will rotate carelessly while opening and closing the crushing claw.

After the rod 21 of the hydraulic direct-acting cylinder 2 reaches the working end on the extension side, if oil is still sent to the bottom side main pipe 23, the pressure of the oil rises, and as shown in FIG. Oil begins to flow into the high pressure side upstream branch pipe 33 through. The oil does not flow from the high pressure side upstream branch pipe 33 into the high pressure side downstream branch pipe 31 or the low pressure side downstream branch pipe 32 which is cut by the electromagnetic switching valve 35. However, in the detour pipe 43, the oil flows in when the sequence valve 432 is opened, and the hydraulic power generation motor 4 is rotated. In this way, power supply to the valve control unit 11 is started by the generator 41, but the valve control unit 11 does not switch the electromagnetic switching valve 35 unless an operation signal from the valve control unit 11 is received.

When the valve operating unit 12 is operated while the generator 41 is supplying power to the valve control unit 11, the electromagnetic switching valve 35 is switched. For example, when an operation signal for rotating the main body to the right is transmitted from the valve operation unit 12, the valve operation unit 11 receiving the operation signal operates the electromagnetic switching valve 35 through the parallel conduit switching operation line 111, as shown in FIG. A signal is sent to move the electromagnetic switching valve 35 to the right in the drawing. Thereby, the parallel pipe line 352 connects the high-pressure side downstream branch pipe 31 and the high-pressure side upstream branch pipe 33 to the low-pressure side downstream branch pipe 32 and the low-pressure side upstream branch pipe 34.

The oil flowing from the bridge circuit 25 into the high pressure side upstream branch pipe 33 continues to flow into the bypass pipe line 43, so that the power supply to the valve control unit 12 by the generator 41 is continued. A part of the oil flowing from the bridge circuit 25 into the high-pressure side upstream branch pipe 33 flows into the hydraulic rotary motor 3 through the high-pressure downstream branch pipe 31 connected to the high-pressure upstream branch pipe 33, and the hydraulic rotary motor 3 is shown in the drawing. Rotate right up. In this way, the hydraulic rotary motor 3 rotates the main body to the right. The hydraulic rotary motor 3 stops when oil is no longer sent to the bottom-side main pipe 23, but even when the valve operating unit 12 stops sending an operation signal, the electromagnetic switching valve 35 returns to its original position and stops. If the valve operating unit 12 does not send the operation signal while the oil is being sent to the bottom side main pipe 23, the oil continues to flow to the bypass pipe line 43, so that the generator 41 continues to supply power to the valve control unit 11.

As shown in FIG. 6, the hydraulic rotary motor 3 can switch the electromagnetic switching valve 35 to rotate counterclockwise in the drawing contrary to the above. Specifically, the valve control unit 11 that has received the operation signal from the valve operation unit 12 sends an operation signal to the electromagnetic switching valve 35 through the crossing pipeline switching operation line 112, and moves the electromagnetic switching valve 35 to the left in the drawing. Then, the cross pipe 353 connects the high pressure side downstream branch pipe 31 and the low pressure side upstream branch pipe 34, and connects the low pressure side downstream branch pipe 32 and the high pressure side upstream branch pipe 33. Then, a part of the oil flowing from the bridge circuit 25 into the high-pressure side upstream branch pipe 33 flows into the hydraulic rotary motor 3 through the low-pressure downstream branch pipe 32 connected to the high-pressure upstream branch pipe 33, and the hydraulic rotary motor 3 is shown in the drawing. Rotate up and left.

Even when the hydraulic rotary motor 3 is rotated counterclockwise in the drawing, the hydraulic rotary motor 3 naturally stops when oil is no longer sent to the bottom side main pipe 23. Further, in the hydraulic rotary motor 3, the electromagnetic switching valve 35 returns to the original state and stops even if the valve operating unit 12 does not transmit the operation signal. If the valve operating unit 12 does not send the operation signal while the oil is being sent to the bottom side main pipe 23, the oil continues to flow to the bypass pipe line 43, so that the generator 41 continues to supply power to the valve control unit 11. However, since the operation signal is not transmitted from the valve operation unit 12, the valve control unit 11 does not switch the electromagnetic switching valve 35.

When opening the crushing claw, as shown in FIG. 7, the rod 21 of the hydraulic linear motion cylinder 2 is contracted. Therefore, the pump is connected to the rod-side main pipe 24 and oil is supplied. The bottom side main pipe 23 is connected to a tank, and the oil discharged from the hydraulic direct-acting cylinder 2 is returned to the tank. While the rod 21 is contracted, the oil does not have a high pressure, and the oil is not sent from the bridge circuit 25 to the high pressure side upstream branch pipe 23. This means that the generator 41 does not generate power and the valve control unit 11 does not operate. Therefore, even if an operation signal is transmitted from the valve operating unit 12, the valve control unit 11 does not switch the electromagnetic switching valve 35, and the hydraulic rotary motor 3 naturally does not rotate.

If the oil is continuously fed to the rod side main pipe 24 after the rod 21 of the hydraulic direct-acting cylinder 2 reaches the retracted working end, the oil pressure rises, and as shown in FIG. Oil begins to flow into the high pressure side upstream branch pipe 33 through. Oil does not flow from the high-pressure side upstream branch pipe 33 into the high-pressure side downstream branch pipe 31 or the low-pressure side downstream branch pipe 32 which is cut by the electromagnetic switching valve 35. However, in the detour pipe 43, the oil flows in when the sequence valve 432 is opened, and the hydraulic power generation motor 4 is rotated. In this way, power supply to the valve control unit 11 is started by the generator 41, but the valve control unit 11 does not switch the electromagnetic switching valve 35 unless an operation signal from the valve control unit 11 is received.

When the valve operating unit 12 is operated while the generator 41 is supplying power to the valve control unit 11, the electromagnetic switching valve 35 is switched. For example, when an operation signal for rotating the main body to the right is transmitted from the valve operation unit 12, the valve operation unit 11 receiving the operation signal operates the electromagnetic switching valve 35 through the parallel conduit switching operation line 111, as shown in FIG. A signal is sent to move the electromagnetic switching valve 35 to the right in the drawing. Thereby, the parallel pipe line 352 connects the high-pressure side downstream branch pipe 31 and the high-pressure side upstream branch pipe 33 to the low-pressure side downstream branch pipe 32 and the low-pressure side upstream branch pipe 34.

The oil flowing from the bridge circuit 25 into the high pressure side upstream branch pipe 33 continues to flow into the bypass pipe line 43, so that the power supply to the valve control unit 12 by the generator 41 is continued. A part of the oil flowing from the bridge circuit 25 into the high-pressure side upstream branch pipe 33 flows into the hydraulic rotary motor 3 through the high-pressure downstream branch pipe 31 connected to the high-pressure upstream branch pipe 33, and the hydraulic rotary motor 3 is shown in the drawing. Rotate right up. In this way, the hydraulic rotary motor 3 rotates the main body to the right. The hydraulic rotary motor 3 stops when oil is no longer sent to the rod-side main pipe 24, but the electromagnetic switching valve 35 returns to its original position and stops even if the valve operating unit 12 stops transmitting an operation signal. If the valve operating unit 12 does not send the operation signal while the oil is being sent to the rod-side main pipe 24, the oil continues to flow to the bypass pipe line 43, so that the generator 41 continues to supply power to the valve control unit 11.

When oil is sent to the rod side main pipe 24 to rotate the hydraulic rotary motor 3 to the left in the drawing, it is the same as when oil is sent to the bottom side main pipe 23 to rotate the hydraulic rotary motor 3 to the left in the drawing. The description is omitted. As will be understood from the following, the crushing attachment, which is the combined operation type attachment 1 of the present invention, has a state in which the rod 21 of the hydraulic linear cylinder 2 for opening and closing the crushing claw reaches the working end on either the extension side or the retracted side. The main body can be rotated clockwise or counterclockwise according to an operation signal from the valve operation unit 12. Even if the rod 21 of the hydraulic direct-acting cylinder 2 reaches the operating end on either the extension side or the contraction side, the main body will not rotate unless the valve operating portion 12 is operated. As described above, the present invention improves the operability of the combined movement type attachment 1.

Further, according to the present invention, by using the electromagnetic switching valve 35 as a three-position switching valve, not only the hydraulic rotary motor 3 as the other of the actuators but also the return movement for retracting the rod 51 from the tube 52 as seen in FIG. Shaped hydraulic direct acting cylinders 5 can be used. When the rod 51 of the hydraulic direct acting cylinder 5 is extended, after the rod 21 of the hydraulic direct acting cylinder 2 reaches the working end on the extension side or the retracting side, the electromagnetic switching valve 35 is moved to the right in the drawing and the parallel conduit 352 The high pressure side downstream branch pipe 31 and the high pressure side upstream branch pipe 33 are connected by. On the contrary, when the rod 51 of the hydraulic direct-acting cylinder 5 is contracted, the electromagnetic switching valve 35 is moved to the left in the drawing after the rod 21 of the hydraulic direct-acting cylinder 2 reaches the working end on the extension side or the contraction side, and the cross pipe A high pressure side downstream branch pipe 31 and a low pressure side upstream branch pipe 32 are connected by a path 352.

1 Complex movement type attachment
11 Valve control section
12 Valve operating part 2 Hydraulic direct acting cylinder
21 rod
22 tubes
23 Bottom side main piping
24 Rod side main piping
25 bridge circuit 3 hydraulic rotary motor
31 High-pressure side downstream branch pipe
32 Low pressure side downstream branch pipe
33 High pressure side upstream branch pipe
34 Low pressure side upstream branch piping
35 Electromagnetic switching valve 4 Hydraulic generator motor
41 generator
42 feeder
43 Detour piping 5 Hydraulic direct acting cylinder
51 rod
52 Tube H High-voltage side output end L Low-voltage side input end

Claims (2)

A combined motion type attachment of a construction machine, in which a hydraulic rotary motor or a hydraulic direct drive cylinder which is the other of the actuators starts to operate after a hydraulic direct drive cylinder which is one of the two actuators reaches an operating end,
A bridge circuit is provided across two main pipes connected to one of the actuators,
Two branch pipes connected to the other of the actuators are connected to the high pressure side and the low pressure side of the bridge circuit,
An electromagnetic switching valve is provided so as to switch the flow or cutoff of oil in each of the two branch pipes,
A hydraulic power generation motor is provided in a bypass pipe connecting the two branch pipes near the bridge circuit from the electromagnetic switching valve,
A combined operation type attachment for a construction machine, in which a valve control unit is directly powered by a generator rotated by the hydraulic power generation motor and is connected to an electromagnetic switching valve by an operation line. Electromagnetic switching valve, parallel line, a three-position switching valve for switching the cutting line and cross line according to claim 1 Symbol placement for a construction machine combined operation type attachment.

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