JPH0581361U - Hydraulic construction machine with hydraulic crusher - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To improve the operability of a construction machine with a hydraulic crusher when the boom and hydraulic crusher operate simultaneously. [Composition] The boom is driven by a boom hydraulic cylinder 15, and the hydraulic crusher is equipped with an attachment cylinder 14.
Driven by two first and second hydraulic pumps 10
1, 102. When the attachment cylinder performs the crushing operation of the crusher or when it opens to release the crushing operation of the crusher, the first device that outputs a signal indicating that the attachment cylinder is in operation, and the boom hydraulic pressure When the cylinder 15 does not move the boom upward, a second device that outputs a signal indicating that the boom is in a light load state, a signal that is output by the first device that indicates the operation of the attachment cylinder, and a second device And a third device for supplying both hydraulic output streams of the two hydraulic pumps to the crusher hydraulic cylinder when both signals are output indicating a light load condition.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic construction machine having a hydraulic crusher, and more particularly to a hydraulic construction machine having a hydraulic crusher and a plurality of hydraulic pumps.

[0002]

[Prior Art]

 In the conventional hydraulic circuit for attachment cylinders as shown in FIG. 5, the hydraulic output flows from the hydraulic pumps 101, 102 merge via the check valves 231, 232 and reach the drive hydraulic circuit for the attachment cylinder 14. Therefore, in the boom cylinder extension operation, the output flows from the two pumps are combined and supplied to the boom cylinder, and in the extension cylinder alone operation, the output flows from the two pumps are combined and supplied to the attachment cylinder. When the tension cylinder is contracted independently, the output flows from the two pumps merge and are supplied to the attachment cylinder. When the boom cylinder extension operation and the attachment cylinder extension operation are linked, there are two pumps for each cylinder. The output flows from the two pumps are combined and supplied in parallel. In the linked operation of the boom cylinder extension operation and the attachment cylinder contraction operation, the output flows from the two pumps are combined and supplied in parallel to each cylinder. It

[0003]

[Problems to be solved by the device]

 In the attachment hydraulic circuit configured as described above, when the boom cylinder extension operation and the attachment cylinder extension or contraction operation are linked (case and), the operating pressure varies depending on the operating pressure of the boom cylinder and the attachment cylinder. In some cases, the hydraulic output flow of the pump is taken by the lower cylinder, and the cylinder with the higher operating pressure does not move. Specifically, in the case of, because the operating pressure of the attachment cylinder is low, it is not possible to extend the boom cylinder at the same time.

Also in the case, when the operating pressure of the boom cylinder extending operation such as the maximum reach posture becomes high, most of the hydraulic output flow rate of the pump flows to the attachment cylinder having the low operating pressure, and There was a problem that stretching operations could not be performed at the same time. For this reason, in operations that require frequent use of linked operations of boom cylinder extension and attachment cylinder extension / contraction operations, simultaneous operations cannot be performed, which requires a lot of work time, resulting in poor productivity and poor operability. There was a defect.

[0005]

[Means for Solving the Problems]

 According to the present invention, the boom is driven by a boom hydraulic cylinder, the hydraulic crusher is driven by a crusher hydraulic cylinder, and a hydraulic crusher having two hydraulic pumps, first and second, is provided. The construction machine outputs a signal indicating that the crusher hydraulic cylinder is in operation when the crusher hydraulic cylinder performs the crushing operation of the crusher or when the crusher opens to release the crushing operation of the crusher. Operation of the crusher hydraulic cylinder output by the first device and the second device that outputs a signal indicating that the boom hydraulic cylinder is in a light load state when the boom hydraulic cylinder does not move the boom upward. When there is both a signal to be displayed and a signal to show the light load condition output by the second device, both the hydraulic output flow of the two hydraulic pumps are connected to the crusher hydraulic cylinder. And a third device for supplying.

[0006]

[Action]

 When the crusher hydraulic cylinder is operating and the boom hydraulic cylinder is under light load, both hydraulic output flows of the two hydraulic pumps are supplied to the crusher hydraulic cylinder, so When the boom hydraulic cylinder is operational and the boom hydraulic cylinder is under heavy load, both hydraulic output flows of the two hydraulic pumps are supplied to the crusher hydraulic cylinder, and the crusher hydraulic cylinder operates at high speed. Prevents the boom hydraulic cylinder from operating at the desired speed due to insufficient hydraulic output flow supplied to the boom hydraulic cylinder.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a hydraulic excavator, 2 denotes a front portion, and a boom 5 has a crusher 3 attached to an end thereof as an attachment. 4 is an opening / closing cylinder of the crusher. A hydraulic pump 101 passes through oil passages 32 and 33 to reach a control valve 29 for the boom cylinder 15 that drives the boom 5. A hydraulic pump 102 passes through an oil passage 31 to reach a control valve 22 of the attachment cylinder 14 and a control valve 21 for the boom cylinder 15. Reference numeral 30 denotes a drive oil passage for the attachment, in which oil flows from the pump 102 via the oil passage 31 and the check valve 232, and joins from the pump 101 via the oil passage 32, the logic valve 24 and the check valve 231.

Reference numeral 12 denotes an operation valve of the attachment cylinder 14, which operates the attachment cylinder 14 by generating a signal pressure in the attachment cylinder opening side pilot oil passage 18 or the attachment cylinder closing side pilot oil passage 19 to move the operation valve 22. That is, when it is desired to operate the attachment cylinder 14 to perform the compression crushing operation, the pressure in the pilot oil passage 19 is increased, the pressure in the pilot oil passage 18 is lowered, and the crushing operation is released to open the attachment. , The pressure in the pilot oil passage 19 is lowered to increase the pressure in the pilot oil passage 18. When it is desired to stop the movement of the attachment cylinder 14, the pressure in both the oil passage 18 and the oil passage 19 is lowered. Reference numeral 13 is an operation valve of the boom cylinder 15, which generates a signal pressure in the boom cylinder expansion side pilot oil passage 35 and the boom cylinder contraction side pilot oil passage 36 to move the operation valve 21 and the operation valve 29, that is, to operate the boom cylinder 15 to operate the front brake. When it is desired to raise the boom 2, the pressure in the oil passage 35 is increased to lower the pressure in the oil passage 36. When it is desired to lower the front boom 2, the pressure in the oil passage 35 is decreased to reduce the pressure in the oil passage 36. Increase power. A shuttle valve 16 selects a high signal pressure for the pilot oil passages 18 and 19 and outputs it to the pilot oil passage 17. That is, when the pressure in either the oil passage 18 or the oil passage 19 is high, the pressure in the pilot oil passage 17 is kept high.

A selector valve 25 controls the pressure of the back pressure oil chamber 241 of the logic valve 24. That is, if the output pressure of the pilot valve A is low, the pressure of the pump 101 is introduced into the back pressure oil chamber 241 through the oil passage 32 to make it high pressure, so that the hydraulic pressure output flow from the pump 101 to the attachment cylinder control valve 22. If the output pressure of the pilot valve A is high, the back pressure oil chamber 241 is connected to the tank oil passage 252 to reduce the pressure therein, and the hydraulic pressure from the pump 101 to the attachment cylinder control valve 22 is reduced. Supply an output stream. A pilot valve A 26 receives the pilot oil passage 17 as an input and outputs the oil passage to the switching oil chamber 251 of the selector valve 25 as an output. When the output pressure of the pilot valve B27 is low, the pressure in the switching oil chamber 251 is made equal to the pressure of the oil passage 17, and when the output pressure of the pilot valve B27 is high, the pressure in the switching oil chamber 251 is drained. Drop it. 262 is a drain tank oil passage. Reference numeral 27 denotes a pilot valve B, which inputs the boom cylinder extension side pilot oil passage 35 and outputs the oil passage to the switching oil chamber 261 of the pilot valve 26. Numeral 272 is a tank oil passage. Numeral 28 is a manual stop valve that inputs the oil passage 18 on the attachment cylinder opening side and outputs the oil passage to the switching oil chamber 271 of the pilot valve 27. The stop valve 28 is movable between a position where the pressure of the oil passage 18 and the pressure of the switching oil chamber 271 are equalized and a position where the pressure of the switching oil chamber 271 is dropped to the drain. When the pressure in the switching chamber 271 is high, the output pressure of the pilot valve B27 becomes the drain pressure of the oil passage 272. Conversely, when the pressure is low, the output pressure is equal to the pressure of the oil passage 35.

The function of the attachment hydraulic circuit configured as described above will be described. When the boom operation valve 13 is operated only by extending the boom cylinder 15 and raising the front boom 2, a signal pressure rises in the boom cylinder extension side pilot oil passage 35, and the operation valves 21 and 29 move upward to move the pumps 101 and 102. The oils merge through the operation valves 29 and 21 and the oil passage 34 to operate the boom cylinder 15.

When the operation valve 12 is operated in a single operation of only opening (crushing operation release) and closing (crushing operation) of the attachment cylinder 14, the attachment cylinder open side pilot oil passage 18 or the attachment closing pilot oil A signal pressure rises in the passage 19 to move the operation valve 22 downward (when the pressure in the oil passage 18 is high and low in the oil passage 19) or upward (when the pressure in the oil passage 19 is high and the pressure in the oil passage 18 is low). Further, a signal pressure rises in the pilot oil passage 17 via the shuttle valve 16 and acts in the switching oil chamber 25 of the selector valve 25 via the pilot valve A26 to operate the selector valve 25 and open the logic valve 24. Through the oil passage 32, the logic valve 24, and the check valve 231, the oil reaches the drive oil passage 30, merges with the oil of the pump 102, and moves the attachment cylinder 14 through the operation valve 22.

In a linked operation in which the boom cylinder 15 is extended and the front boom 2 is raised and at the same time the attachment cylinder 14 is extended and a crushing operation is performed, the signal pressure of the boom cylinder extension side pilot oil passage 35 is transferred to the switching oil chamber 261 via the pilot valve B27. When the pilot valve A26 operates, the pressure in the switching oil chamber 251 of the selector valve 25 is released to the tank oil passage 262, the selector valve 25 returns to its position by the spring, and the logic valve 24 closes to the valve 22 of the pump 101, 102. Will not be merged and supplied. Therefore, the oil of the pump 101 does not flow into the drive oil passage 30, but flows into the boom cylinder 15 only via the oil passage 33 and the operation valve 29. The oil of the pump 102 flows into the operation valves 22 and 21 in parallel at the same time via the oil passage 31 so that the oil of the pump 101 flows into the boom cylinder 15 while the oil having the lower working pressure (usually the attachment side is lower) flows. Therefore, the boom cylinder 15 will always move.

The interlocking operation of the extension operation of the boom cylinder 15 and the contraction operation of the attachment cylinder 14 has different functions depending on whether the stop valve 28 is opened or closed. When the stop valve 28 is opened (the pressure in the oil passage 17 and the pressure in the switching chamber 271 are equal): In this case, the signal pressure in the pilot oil passage 18 acts on the switching oil chamber 271 via the stop valve 28, so that the pilot valve B27 is The pilot valve A26 is returned to its original position by the spring because it operates and releases the pressure of the switching oil chamber 261 to the tank oil passage 272, and the signal pressure of the pilot oil passage 18 is switched through the shuttle valve 16, the oil passage 17, and the pilot valve A26. By acting on the oil chamber 251, the selector valve 25 is operated and the logic valve 24 is opened, so that the oils of the pumps 101 and 102 join the expansion operation of the boom cylinder 15 and the contraction operation of the attachment cylinder 14 to form a parallel circuit. Since the operating pressure when the attachment cylinder 15 is contracted is quite high, the boom cylinder 15 and the attachment cylinder 14 can be operated at the same time unless the operating pressure of the boom cylinder 15 is particularly high when the front boom 2 is in the maximum reach position. Is.

When the stop valve 28 is closed (the pressure in the switching chamber 271 drops to the drain): In this case, since the signal pressure in the pilot oil passage 18 does not act on the switching oil chamber 271, the pilot valve B27 remains in the normal position. The same operation as the extension operation of the boom cylinder 15 and the extension operation of the attachment cylinder 14 is performed, and the logic valve 24 is closed. Therefore, the oil of the pump 101 always flows into the boom cylinder 15 regardless of the operation of the attachment cylinder 14. Ensure the movement of the boom cylinder. This case is used when the operating pressure of the boom is high and the boom extension is poorly linked with the stop valve 28 left open. In the embodiment, the stop valve 28 is a manually operated valve, but this valve may be a remote operated valve such as an electromagnetic switching valve. In that case, switching according to work becomes easier, and the effectiveness of the hydraulic circuit of the present invention is improved. Was raised.

3 and 4 show another embodiment. In FIG. 3, the logic valve 24 and the selector valve 25 are modified, and in FIG. 4, the circuit in which the pilot valves A26 and B27 are omitted is provided, but its function and effect are the same as those of the hydraulic circuit of the present invention.

Table 1 shows the relationship between the merging of the two pumps 101 and 102 and the operation of the stop valve 28, the boom cylinder 15 and the attachment cylinder (ATT) 14 of the construction machine according to the present invention. 2P means that the circuit allows the oil for two pumps to join, and 1P means that the circuit allows only the oil for one pump to flow.

[0017]

[Table 1]

[0018]

[Effect of the device]

 In the hydraulic circuit for attachments configured as described above, the normal boom cylinder extension and the single operation of the attachment cylinders each provide two pump merging circuits to achieve a high operating speed. Even if the operation of the extension of the attachment cylinder or the operation of the extension of the boom cylinder and the contraction of the attachment cylinder is interlocked, the extension of the boom cylinder and the attachment cylinder will not be affected even if the operating pressure changes when the boom cylinder extends. Both can be operated simultaneously, improving workability and productivity. It is considered that the work to crush concrete or asphalt, which is close to the ground level, or the crusher is used as an attachment, and is effective for the work that frequently involves vertical work.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of an attachment according to a first embodiment of the invention.

FIG. 2 is an external view of a hydraulic excavator equipped with a crusher as an attachment.

FIG. 3 is a hydraulic circuit diagram according to a second embodiment of the present invention.

FIG. 4 is a hydraulic circuit diagram according to a third embodiment of the present invention.

FIG. 5 is a hydraulic circuit diagram for a conventional attachment.

[Explanation of symbols]

 14 Attachment cylinder 16 Shuttle valve 17 Pilot oil passage 24 Logic valve 25 Selector valve 26 Pilot valve A 27 Pilot valve B 28 Stop valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumihiko Ishise 2-5-1, Marunouchi, Chiyoda-ku, Tokyo Sanryo Heavy Industries Co., Ltd. (72) Masanori Hayashi 1-1-1, Kamishinchi, Nishi-ku, Kobe-shi, Hyogo Shinki Design Co., Ltd.

Claims (13)

[Scope of utility model registration request] 1. A hydraulic construction machine having a hydraulic crusher, in which a boom is driven by a boom hydraulic cylinder, a hydraulic crusher is driven by a crusher hydraulic cylinder, and which has two hydraulic pumps, first and second hydraulic pumps. The crusher hydraulic cylinder outputs a signal indicating that the crusher hydraulic cylinder is in operation when the crusher hydraulic cylinder performs the crushing operation of the crusher or when the crusher hydraulic cylinder is opened to release the crusher crushing operation. One device, a second device that outputs a signal indicating that the boom hydraulic cylinder is in a light load state when the boom hydraulic cylinder does not move the boom upward, and a signal that indicates the operation of the fracturing hydraulic cylinder output by the first device. And a signal indicating the light load condition output by the second device, both hydraulic output streams of the two hydraulic pumps are supplied to the crusher hydraulic cylinder. A hydraulic construction machine having a hydraulic crusher having a third device for feeding. 2. A hydraulic construction machine having a hydraulic crusher according to claim 1, wherein both of the hydraulic output flows of the two hydraulic pumps when the boom hydraulic cylinder operates to raise the boom upward. And a fourth device for supplying the boom hydraulic cylinder to a hydraulic construction machine having a hydraulic crusher. 3. A hydraulic construction machine having a hydraulic crusher according to claim 1, wherein the first device is a pilot type hydraulic directional control valve for controlling the hydraulic cylinder of the crusher when outputting the output. A hydraulic construction machine having a hydraulic crusher that determines the operating state of the crusher hydraulic cylinder from pilot pressure. 4. The hydraulic construction machine according to claim 1, wherein the second device is a pilot type hydraulic directional control valve that controls a boom hydraulic cylinder when the second device outputs the hydraulic crusher. A hydraulic construction machine having a hydraulic crusher that determines the operating state of a boom hydraulic cylinder from pressure. 5. The hydraulic construction machine having the hydraulic crusher according to claim 1, wherein the output of the first device is a hydraulic crusher having a hydraulic crusher. 6. The hydraulic construction machine according to claim 1, wherein the hydraulic crusher has a hydraulic crusher, and the output of the second device is a change in hydraulic pressure. 7. A hydraulic construction machine having a hydraulic crusher according to claim 1, further comprising a one-way valve for preventing generation of hydraulic flow from the first pump to the second pump. A hydraulic construction machine having a hydraulic crusher. 8. The hydraulic construction machine according to claim 1, wherein the hydraulic construction machine has a hydraulic crusher, and the third device has a pilot hydraulic opening / closing valve, and the crusher hydraulic cylinder is output by the first device. When there is both a signal indicating the operation of and the signal indicating the light load state output by the second device, the pilot pressure of the pilot type hydraulic opening / closing valve is reduced,
The pilot type hydraulic on-off valve is opened to supply both the hydraulic output flows of the two hydraulic pumps to the crusher hydraulic cylinder, and the signal indicating the operation of the crusher hydraulic cylinder output by the first device and the second When both signals indicating the light load condition output by the device are not aligned, the pilot hydraulic on / off valve is supplied with the output hydraulic pressure from the pump as the pilot pressure of the pilot type on / off valve. A hydraulic construction machine with a hydraulic crusher that closes and prevents both hydraulic output streams of two hydraulic pumps from supplying to the crusher hydraulic cylinder. 9. The hydraulic construction machine having a hydraulic crusher according to claim 1, wherein the boom hydraulic cylinder operates to raise the boom upward, and the crusher hydraulic cylinder performs a crushing operation, The third device is a hydraulic construction machine having a hydraulic crusher that prevents both hydraulic output streams of the two hydraulic pumps from being supplied to the crusher hydraulic cylinder. 10. A hydraulic construction machine having a hydraulic crusher according to claim 1, wherein the second device is in a light load state when the boom hydraulic cylinder operates to stop the movement of the boom. A hydraulic construction machine having a second device that outputs a signal indicating that there is a hydraulic crusher. 11. The hydraulic construction machine having a hydraulic crusher according to claim 1, wherein the second device also performs an opening operation so that the crusher hydraulic cylinder releases the crushing operation of the crusher. , A hydraulic construction machine having a hydraulic crusher that outputs a signal indicating that it is in a light load state. 12. A hydraulic construction machine having a hydraulic crusher according to claim 1, wherein the second device is in a light load state when the boom hydraulic cylinder operates to lower the boom. A hydraulic construction machine having a second device for outputting a signal for displaying and a hydraulic crusher. 13. A hydraulic construction machine having a hydraulic crusher according to claim 12, wherein the second device is a pilot type hydraulic directional control valve for controlling the hydraulic cylinder of the crusher when outputting the output. A hydraulic construction machine having a hydraulic crusher that determines the operating state of the crusher hydraulic cylinder from pilot pressure.