CN109458365B - Engineering machinery hydraulic system and engineering machinery - Google Patents
Engineering machinery hydraulic system and engineering machinery Download PDFInfo
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- CN109458365B CN109458365B CN201811580351.9A CN201811580351A CN109458365B CN 109458365 B CN109458365 B CN 109458365B CN 201811580351 A CN201811580351 A CN 201811580351A CN 109458365 B CN109458365 B CN 109458365B
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- 238000010276 construction Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 114
- 238000005553 drilling Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0802—Actuators for final output members
- F16H2007/0812—Fluid pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic system of engineering machinery and the engineering machinery, relates to the field of engineering machinery, and is used for realizing real-time tensioning of a chain in the working process of the engineering machinery. The hydraulic system of the engineering machinery comprises a hydraulic pump, a control valve group, a first executing element and a second executing element. The first executing element is connected with the hydraulic pump through the control valve group; the second actuating element is connected with the hydraulic pump through the control valve group and is used for tensioning the chain wound on the first actuating element. Wherein the control valve block is configured to simultaneously supply oil to the first and second actuators. According to the technical scheme, the control valve group is arranged, and oil is continuously supplied to the first executive component and the second executive component in the working process of the first executive component. As soon as the chain is loose, the second actuating element pushes the chain to move to tension the chain. The technical scheme realizes real-time tensioning of the chain.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to an engineering machinery hydraulic system and engineering machinery.
Background
Along with the rapid increase of capital construction investment at home and abroad, more and more foundation engineering construction projects exist, and the multifunctional drilling machine is used as one of equipment for foundation construction, so that the use frequency of the multifunctional drilling machine is also more and more frequent.
The multifunctional drilling machine adopts a tensioning system to realize tensioning of the chain. Specifically, tensioning system realizes the tensioning of chain through mechanical system, and it includes chain, connector, round pin axle, screw rod, nut, screw rod fixing base and fixed bolster. The chain is connected with the connector through a pin shaft, the screw is connected with the connector through threads, the screw is fixed with the screw fixing seat through a nut, the screw fixing seat is connected with the power head sliding frame through a fixed support, and the screw fixing seat can rotate in the fixed support. When the chain loosens, the chain is tensioned through the adjusting nut.
The inventors found that at least the following problems exist in the prior art: first, in the power head back and forth movement in-process, because the rocking of chain makes the whole that connector and screw rod are constituteed receive irregular force, causes the root fracture that connector and screw rod are connected easily, forms unsafe factor. Secondly, this tensioning system need use the spanner to adjust through the manual work, and the regulation space is narrow and small, difficult regulation. Thirdly, because of space limitation, the tensioning system has relatively small adjusting stroke, and after the adjusting stroke limitation is reached, the tensioning system cannot be continuously adjusted, so that the chain is loosened, and the construction efficiency is influenced. Fourth, the adoption of the tensioning device can not implement real-time tensioning requirements, and the service life and the construction efficiency of the chain are seriously affected.
Disclosure of Invention
The invention provides an engineering machinery hydraulic system and an engineering machinery, which are used for realizing real-time tensioning of a chain in the working process of the engineering machinery.
The invention provides a hydraulic system of engineering machinery, which comprises:
a hydraulic pump;
a control valve group;
the first executing element is connected with the hydraulic pump through the control valve group; and
the second execution element is connected with the hydraulic pump through the control valve group and is used for tensioning a chain wound on the first execution element;
wherein the control valve block is configured to simultaneously supply oil to the first and second actuators.
In some embodiments, the first actuator comprises:
a power head;
the working part is in driving connection with the power head; and
and the brake is used for braking the working part, wherein the brake is in an oil inlet state, and the working part is unlocked.
Wherein the control valve block is configured to simultaneously supply oil to the working member, the brake, and the second actuator.
In some embodiments, the control valve block comprises:
the reversing valve comprises an oil inlet, an oil return port, a first working oil port and a second working oil port; and
the cartridge valve comprises a first oil port, a second oil port, a third oil port, a fourth oil port and a fifth oil port; the first oil port is connected with the first working oil port, the oil port of the second actuating element and the oil port of the brake, and the second oil port is connected with the second working oil port; the third oil port is connected with the first port of the working part; the fourth oil port is connected with the second port of the working part; the fifth oil port is connected with the oil port of the second executing element and the oil port of the brake.
In some embodiments, the cartridge valve comprises:
the first valve group is arranged between the first oil port and the second oil port; and
the second valve group is arranged among the first oil port, the second executing element and the brake.
In some embodiments, the first valve block comprises:
the oil outlet of the first one-way valve is connected with the first port of the working part, and the first one-way valve is used for controlling oil to flow into the first port of the working part in one way through the first oil port; and
the oil inlet of the pilot valve is connected with the first port of the working part, the oil outlet of the pilot valve is connected with the second port of the working part, and the control oil port of the pilot valve is connected with the second port of the working part and the second working oil port of the reversing valve.
In some embodiments, a control port of the pilot valve is provided with a throttle valve.
In some embodiments, the second valve block comprises:
the first oil inlet of the shuttle valve is connected with the first working oil port of the reversing valve, the second oil inlet of the shuttle valve is connected with the second working oil port of the reversing valve and the second port of the working part, and the oil outlet of the shuttle valve is connected with the oil port of the second executing element.
In some embodiments, the second valve block further comprises:
the pressure reducing valve is arranged between the oil outlet of the shuttle valve and the oil port of the second executing element.
In some embodiments, the second valve block further comprises:
the logic valve is arranged between the oil outlet of the pressure reducing valve and the oil port of the second executing element.
In some embodiments, the logic valve comprises a two-position three-way valve.
In some embodiments, the reversing valve comprises a three-position four-way valve.
In some embodiments, the working component comprises a hydraulic motor configured to drive the power head up and down.
In some embodiments, the second actuator comprises a single-acting ram.
In some embodiments, the oil port of the second actuator is provided with an oil return path, and the oil return path is provided with a regulating valve.
In some embodiments, the regulator valve comprises a relief valve.
Another embodiment of the present invention provides an engineering machine, including an engineering machine hydraulic system provided by any one of the technical solutions of the present invention.
In some embodiments, the work machine further comprises:
a chain wound around the first actuator; and
the supporting device is propped against the chain;
the second executing element is in driving connection with the supporting device so as to resist the supporting device to move when the chain loosens, so that the chain is tensioned.
In some embodiments, the work machine further comprises:
and the guide device is provided with the support device and is used for providing guide for the movement of the support device.
In some embodiments, the guide comprises a slide.
In some embodiments, the support device comprises:
a support frame; and
the idler wheel is propped against the chain and is arranged on the supporting frame.
In some embodiments, the work machine includes a drill.
According to the engineering machinery hydraulic system provided by the technical scheme, the control valve group is arranged, and in the working process of the first executive component, the control valve group continuously supplies oil to the first executive component and the second executive component. The second actuating element is used for tensioning the chain wound on the first actuating element, and the second actuating element pushes the chain to move so as to tension the chain as long as the chain loosens. The technical scheme realizes real-time tensioning of the chain.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a hydraulic system of an engineering machine according to an embodiment of the present invention;
fig. 2 is a schematic view of a partial structure of a construction machine at a tensioning position according to another embodiment of the present invention.
Detailed Description
The technical scheme provided by the invention is described in more detail below with reference to fig. 1-2.
For convenience in describing the technical scheme of the embodiment of the invention, the hydraulic system is used for a drilling machine as an example.
Referring to fig. 1 and 2, the invention provides a hydraulic system of engineering machinery, which comprises a hydraulic pump 1, a control valve group 2, a first executing element 3 and a second executing element 4. The first executive component 3 is connected with the hydraulic pump 1 through the control valve group 2; the second actuator 4 is connected to the hydraulic pump 1 via the control valve block 2, the second actuator 4 being used to tension a chain 6 wound on the first actuator 3. Wherein the control valve group 2 is configured to supply oil to both the first 3 and the second 4 actuators.
By the system, when the power head of the multifunctional drilling machine moves back and forth, the tensioning device can tension the chain 6 in real time. The screw tightening device has the advantages that the hydraulic oil control mode is adopted to replace the screw tightening mode in the prior art, the problem that the screw is easy to break in the tensioning device is effectively solved, and the safety and reliability of the whole machine are improved. Moreover, by adopting the tensioning device, the problems that the screw is not easy to adjust and the adjusting stroke is short are effectively solved.
Referring to fig. 1, in some embodiments, the first actuator 3 includes a power head (not shown), a working member 31, and a brake 32. The working part 31 is in driving connection with the power head; the brake 32 is used to brake the working member 31. Wherein the brake 32 is in an oil-in state and the working member 31 is unlocked. Wherein the control valve group 2 is configured to simultaneously supply oil to the working member 31, the brake 32 and the second actuator 4.
As shown in fig. 1, the brake 32 is one-sided in oil. After oil is fed, the oil pushes the brake lever of the brake 32 to move so as to disengage from the first actuator 3, and the first actuator 3 is specifically a hydraulic motor. After the hydraulic motor is separated, the hydraulic motor rotates under the action of the oil conveyed by the hydraulic pump 1. The hydraulic motor rotates to drive the power head to stretch out and draw back. During the telescopic movement of the power head, the chain 6 wound on the power head may be loosened. However, as long as the chain 6 is loosened, the second actuating element 4 pushes the chain 6 to move towards the tensioning direction under the action of the oil conveyed by the hydraulic pump 1 so as to realize the tensioning of the chain. The brake 32 is in a non-oil-in state, and the brake lever of the brake 32 is extended to brake the working member 31 under the action of the spring in the brake 32.
Referring to fig. 1, the control valve block 2 includes a reversing valve 21 and a cartridge valve 22. The reversing valve 21 comprises an oil inlet P, an oil return port T, a first working oil port A and a second working oil port B. The cartridge valve 22 includes a first port V1, a second port V2, a third port C1, a fourth port C2, and a fifth port M. The first oil port V1 is connected with the first working oil port A. The second oil port V2 is connected with the second working oil port B; the third oil port C1 is connected to the first port K1 of the working member 31; the fourth port C2 is connected to the second port K2 of the working member 31. The fifth port M is connected to the port a of the second actuator 4 and the port of the stopper 32.
The reversing valve 21 is used to achieve forward rotation and reverse rotation of a hydraulic motor described later. The reversing valve 21 comprises a three-position four-way valve.
Referring to fig. 1, in some embodiments, cartridge valve 22 includes a first valve block 221 and a second valve block 222. The first valve group 221 is disposed between the first oil port V1 and the second oil port V2. The second valve group 222 is disposed between the first oil port V1, the second oil port V2, the second actuator 4, and the brake 32.
The first valve group 221 is configured to supply oil to the first port K1 of the first actuator 3. In some embodiments, the first valve group 221 is configured to form two oil paths, one of which is in operation. When the hydraulic motor rotates positively, the first oil way supplies oil to the first port K1 of the first executing element 3 in one way, and the second oil way does not work. When the hydraulic motor is reversed, the oil output from the first port K1 of the first actuator 3 flows back to the oil tank 11 through the second oil passage.
Referring to fig. 1, in some embodiments, the first valve block 221 includes a first check valve 223 and a pilot valve 224. The oil inlet P of the first check valve 223 is connected with the first oil port V1, the oil outlet of the first check valve 223 is connected with the first port K1 of the working member 31, and the first check valve 223 is used for controlling the oil to flow into the first port K1 of the working member 31 in a unidirectional manner through the first oil port V1. The oil inlet P of the pilot valve 224 is connected to the first port K1 of the working member 31, the oil outlet of the pilot valve 224 is connected to the second port K2 of the working member 31, and the control oil port of the pilot valve 224 is connected to the second port K2 of the working member 31 and the second working oil port B of the reversing valve 21.
Referring to fig. 1, the first check valve 223 is disposed on the first oil path of the first valve bank 221, for achieving one-way oil intake to the first port K1 of the first actuator 3.
Referring to fig. 1, the pilot valve 224 is on the second oil path of the first valve bank 221. The control port of the pilot valve 224 is connected to the second port K2 of the working member 31 and also connected to the second port V2 of the cartridge valve 22. The oil pressure of the second port V2 of the cartridge valve 22 controls the open and closed states of the pilot valve 224.
Referring to fig. 1, in some embodiments, the second valve group 222 includes a shuttle valve 225, a first oil inlet a of the shuttle valve 225 is connected to the first working oil port a of the reversing valve 21, a second oil inlet B of the shuttle valve 225 is connected to the second working oil port B of the reversing valve 21 and the second port K2 of the working member 31, and an oil outlet c of the shuttle valve 225 is connected to the oil port a of the second actuator 4.
Referring to fig. 1, in some embodiments, second valve block 222 further includes a relief valve 226, relief valve 226 being disposed between oil outlet c of shuttle valve 225 and oil port a of second actuator 4.
The relief valve 226 allows the pressure of the oil entering the second actuator 4 and the brake 32 to be satisfactory.
Referring to fig. 1, in some embodiments, second valve block 222 further includes a logic valve 227, logic valve 227 being disposed between the oil outlet of relief valve 226 and oil port a of second actuator 4.
Referring to fig. 1, the logic valve 227 is a two-position three-way valve, and when the logic valve is in the left position in fig. 1, the second actuator 4 is in an oil-in state to realize real-time tensioning of the chain 6. The brake 32 is also in an oil-in state to effect unlocking of the working member 31. When it is in the right position in fig. 1, the second actuator 4 is in a draining state, and the chain 6 is loosened in time. The brake 32 is also in a drain state so that the brake 32 is completely closed to effectively lock the working member 31.
In the above technical solution, the second valve group 222 adopts the combination of the pressure reducing valve 226 and the logic valve 227, so that when the feed hydraulic system works, the second valve group provides proper pressure for the brake 32 and the tensioning device; the pressure in the pipeline can be timely unloaded when the chain is not in operation, so that the brake 32 can timely brake, the chain 6 can be timely loosened, and the service life of the chain 6 can be prolonged.
In some embodiments, working member 31 comprises a hydraulic motor configured to drive the power head up and down.
In some embodiments, the second actuator 4 comprises a single-acting ram. And oil inlet and oil return of the second execution element 4 are both carried out through the same oil port a.
Referring to fig. 1, in some embodiments, the oil port a of the second actuator 4 is provided with an oil return path, and the oil return path is provided with a regulating valve 5 to realize oil drainage according to needs.
In some embodiments, the regulator valve 5 comprises one of the following: relief valve, sequence valve or logic control valve.
The following describes the operation of the hydraulic system of the construction machine with reference to fig. 1 and 2. The oil tank 11 is connected to an oil suction port of the hydraulic pump 1, a T port of the reversing valve 21, and a T port of the hydraulic motor, respectively. The oil outlet of the hydraulic pump 1 is connected with the P port of the reversing valve 21; the A, B ports of the reversing valve 21 are respectively connected with the V1 and V2 ports of the cartridge valve 22. The ports C1 and C2 of the cartridge valve 22 are respectively connected with the inlet port of the hydraulic motor. The M port of the cartridge valve 22 is connected with the M port of the brake 32 and the A port of the second one-way valve 10 respectively; the T port of the cartridge valve 22 is connected with the T port of the hydraulic motor and the T port of the regulating valve 5 respectively. The port B of the second check valve 10 is connected with the port P of the regulating valve 5 and the port a of the second actuating element (tensioning cylinder) 4 respectively.
When the drilling machine feeds, the V1 feeds oil, and the power head rises. The hydraulic pump 1 supplies power to the hydraulic motor, the brake 32 and the tensioning cylinder through the reversing valve 21 and the cartridge valve 22. By controlling the reversing valve 21 to reverse, the brake 32 is opened, and the hydraulic motor is rotated in the forward and reverse directions, so that the power head of the drilling machine can be lifted and lowered back and forth. At the same time, the high pressure oil at the V1 and V2 ports provides proper opening pressure to the brake 32 and proper tensioning force to the tensioning cylinder through the shuttle valve 225, the relief valve 226 and the logic valve 227, respectively. When V2 is fed, the power head descends, and the power head is quickly and stably lowered through the first valve group 221 and the throttle valve 12.
The specific principle of the action process of the automatic tensioning and feeding hydraulic system is as follows: when the drill feed system is in operation, the hydraulic system powers the hydraulic motor, brake 32 and tensioning cylinder via the hydraulic pump 1 and cartridge valve 22. The brake 32 is opened and the power head is moved back and forth. Meanwhile, the tensioning cylinder is preloaded by filling oil through the second one-way valve 10, and oil in the tensioning cylinder is locked through the adjusting valve 5 and the second one-way valve 10, so that tensioning and pressure maintaining are achieved. When the force instantaneously received by the feed chain 6 is transmitted to the tensioning cylinder through the roller 72 to exceed the set value of the adjusting valve 5, the adjusting valve 5 is opened, thereby protecting the chain 6 and the tensioning device from being damaged. Thus, when the drilling machine is working, the tensioning device can be tensioned by the automatic tensioning feed hydraulic system.
When the tensioning cylinder is tensioned, the second one-way valve is adopted for oil way check, so that pressure limitation of the overflow valve to the cylinder body is facilitated, the tensioning effect is achieved, and the tensioning device is effectively prevented from being damaged due to overlarge stress.
According to the technical scheme, when the power head of the multifunctional drilling machine moves back and forth, the tensioning device is tensioned in real time; simultaneously, the tensioning device is not easy to damage, easy to adjust and long in adjusting stroke.
Another embodiment of the present invention provides an engineering machine, including an engineering machine hydraulic system provided by any one of the technical solutions of the present invention.
Referring to fig. 2, in some embodiments, the work machine further comprises a chain 6 and a support device 7. The chain 6 is wound around the first actuator 3; the supporting means 7 bear against the chain 6. Wherein the second actuator 4 is in driving connection with the supporting device 7 to move against the supporting device 7 to tighten the chain 6 when the chain 6 is loosened.
The second actuator 4 comprises a single-acting ram. The first actuator 3 comprises a hydraulic motor and a power head. The hydraulic motor drives the power head to lift.
Referring to fig. 2, the construction machine further comprises a guide device 8, the guide device 8 is provided with a supporting device 7, and the guide device 8 is used for providing guidance for the movement of the supporting device 7 so as to enable the movement of the supporting device 7 to be smooth.
Referring to fig. 2, in some embodiments, the guide 8 comprises a slideway. The second actuator 4 pushes the support means 7 to slide along the guide means 8.
Referring to fig. 2, in some embodiments, the supporting device 7 includes a supporting frame 71 and a roller 72, and the roller 72 abuts against the chain 6 and is mounted on the supporting frame 71.
Referring to fig. 2, the chain 6 is wound around the roller 72; one end of the tensioning cylinder is fixed on the support 71, and the other end is fixed on the drill mast. The supporting frame 71 is fixedly connected with the roller 72 through a pin shaft. When the feed chain 6 is loosened, the rollers 72 are pushed by the tensioning cylinder to move along the slideway, so that tensioning of the feed chain 6 is realized.
In some embodiments, the work machine includes a drill.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A hydraulic system for a construction machine, comprising:
a hydraulic pump (1);
a control valve group (2);
the first executing element (3) is connected with the hydraulic pump (1) through the control valve group (2); and
the second execution element (4) is connected with the hydraulic pump (1) through the control valve group (2), and the second execution element (4) is used for tensioning a chain (6) wound on the first execution element (3);
wherein the control valve group (2) is configured to supply oil to the first actuator (3) and the second actuator (4) simultaneously;
wherein the first actuator (3) comprises:
a power head;
a working member (31) drivingly connected to the power head; and
a brake (32) for braking the working member (31), wherein the brake (32) is in an oil-in state, and the working member (31) is unlocked;
wherein the control valve group (2) is configured to simultaneously supply oil to the working member (31), the brake (32) and the second actuator (4);
the control valve group (2) comprises:
the reversing valve (21) comprises an oil inlet, an oil return port, a first working oil port and a second working oil port; and
the cartridge valve (22) comprises a first oil port, a second oil port, a third oil port, a fourth oil port and a fifth oil port; the first oil port is connected with the first working oil port; the second oil port is connected with the second working oil port; the third oil port is connected with a first port of the working part (31); the fourth oil port is connected with a second port of the working part (31); the fifth oil port is connected with the oil port of the second execution element (4) and the oil port of the brake (32);
the cartridge valve (22) includes:
the first valve group (221) is arranged between the first oil port and the second oil port; and
a second valve group (222) provided between the first oil port, the second actuator (4), and the brake (32);
the first valve group (221) comprises:
the oil inlet of the first one-way valve (223) is connected with the first oil port, the oil outlet of the first one-way valve (223) is connected with the first port of the working part (31), and the first one-way valve (223) is used for controlling oil to flow into the first port of the working part (31) in one way through the first oil port of the first valve group (221); and
the oil inlet of the pilot valve (224) is connected with the first port of the working part (31), the oil outlet of the pilot valve (224) is connected with the second port of the working part (31), and the control oil port of the pilot valve (224) is connected with the second port of the working part (31) and the second working oil port of the reversing valve (21);
a throttle valve (12) is arranged at a control oil port of the pilot valve (224);
the second valve group (222) includes:
the first oil inlet of the shuttle valve (225) is connected with the first working oil port of the reversing valve (21), the second oil inlet of the shuttle valve (225) is connected with the second working oil port of the reversing valve (21) and the second port of the working part (31), and the oil outlet of the shuttle valve (225) is connected with the oil port of the second executing element (4);
the second valve block (222) further comprises:
the pressure reducing valve (226) is arranged between the oil outlet of the shuttle valve (225) and the oil port of the second execution element (4);
the second valve block (222) further comprises:
the logic valve (227) is arranged between the oil outlet of the pressure reducing valve (226) and the oil port of the second execution element (4);
the logic valve (227) comprises a two-position three-way valve; the reversing valve (21) comprises a three-position four-way valve;
-the working part (31) comprises a hydraulic motor configured to drive the power head up and down;
the second actuator (4) comprises a single-acting cylinder.
2. The hydraulic system of the engineering machinery according to claim 1, characterized in that the oil port of the second execution element (4) is provided with an oil return path, and the oil return path is provided with a regulating valve (5).
3. A hydraulic system of a construction machine according to claim 2, characterized in that the regulating valve (5) comprises a relief valve.
4. A construction machine comprising the construction machine hydraulic system according to any one of claims 1 to 3.
5. The work machine of claim 4, further comprising:
a chain (6) wound around the first actuator (3); and
-a support device (7) against the chain (6);
the second actuating element (4) is in driving connection with the supporting device (7) so as to resist the supporting device (7) to move when the chain (6) loosens, so that the chain (6) is tensioned.
6. The work machine of claim 5, further comprising:
-a guiding device (8) mounted with the supporting device (7), the guiding device (8) being adapted to provide guiding for the movement of the supporting device (7).
7. A working machine according to claim 6, characterized in that the guiding means (8) comprise a slideway.
8. A working machine according to claim 6, characterized in that the supporting means (7) comprise:
a support (71); and
and a roller (72) which is abutted against the chain (6) and is mounted on the support frame (71).
9. The work machine of claim 4, wherein the work machine comprises a drill.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811580351.9A CN109458365B (en) | 2018-12-24 | 2018-12-24 | Engineering machinery hydraulic system and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811580351.9A CN109458365B (en) | 2018-12-24 | 2018-12-24 | Engineering machinery hydraulic system and engineering machinery |
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| CN109458365A CN109458365A (en) | 2019-03-12 |
| CN109458365B true CN109458365B (en) | 2024-02-02 |
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