CN218030864U - Rotary hydraulic system and rotary drilling rig - Google Patents
Rotary hydraulic system and rotary drilling rig Download PDFInfo
- Publication number
- CN218030864U CN218030864U CN202222466311.XU CN202222466311U CN218030864U CN 218030864 U CN218030864 U CN 218030864U CN 202222466311 U CN202222466311 U CN 202222466311U CN 218030864 U CN218030864 U CN 218030864U
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- port
- oil pump
- rotary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model relates to an engineering machine tool technical field, concretely relates to gyration hydraulic system and dig rig soon. The rotary hydraulic system includes: a rotary motor having a first oil port and a second oil port; the first reversing valve is provided with an oil inlet, an oil return port, a first working oil port and a second working oil port; the first oil pump is communicated with the oil inlet; the first sequence valve is connected between the first working oil port and the first oil port; and the second sequence valve is connected between the second working oil port and the second oil port. The utility model discloses connect first sequence valve on first hydraulic fluid port, connect the second sequence valve on the second hydraulic fluid port, the hydraulic pressure oil stream is in the unobstructed switch-on when to the rotary motor, and the sequence valve can provide stable backpressure when hydraulic oil flows back from the rotary motor, the oil return passageway of first sequence valve and second sequence valve is opened and is closed can not receive the influence that oil feed pressure changed, make the rotary motor keep steady state, effectively solved among the prior art dig the rig gyration process steadily lead to the problem that is difficult to the operation.
Description
Technical Field
The utility model relates to an engineering machine tool technical field, concretely relates to gyration hydraulic system and dig rig soon.
Background
The rotary drilling rig is a construction machine suitable for hole forming operation in building foundation engineering, is mainly applied to foundation construction of large-scale engineering such as bridge construction, high-rise buildings and the like at present, the rotation function of the rotary drilling rig is completed by a rotation motor, and the rotary drilling rig requires accurate rotation positioning and stable start and stop during construction due to construction characteristics of the rotary drilling rig.
At present, in order to ensure the stability of the rotation process of the rotary drilling rig, the rotation process is generally realized by arranging a rotary buffer valve on a hydraulic loop of a rotary motor, the oil return pressure of the rotary buffer valve is controlled by the pressure of an oil inlet of the rotary drilling rig, but a mast of the rotary drilling rig is higher, the rotary drilling rig can rock due to the inertia effect of the mast after being started, the mast rocks to enable the rotary motor to switch back and forth between different working conditions, the pressure of the oil inlet of the rotary buffer valve is further enabled to change continuously, the oil return channel of a balance valve in the rotary buffer valve is enabled to be opened and closed back, and the problem of inaccurate operation caused by the instability of the rotation process also exists in the subsequent construction process.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that the rotary drilling rig gyration process is unstable among the prior art and leads to being difficult to operate to a gyration hydraulic system and rotary drilling rig are provided.
In order to solve the above problem, the utility model provides a gyration hydraulic system, include: a rotary motor having a first oil port and a second oil port; the first reversing valve is provided with an oil inlet, an oil return port, a first working oil port and a second working oil port, the first working oil port is communicated with the first oil port, and the second working oil port is communicated with the second oil port; the first oil pump is communicated with the oil inlet; the first sequence valve is connected between the first working oil port and the first oil port so that the first working oil port is in unobstructed conduction towards the first oil port; and the second sequence valve is connected between the second working oil port and the second oil port, so that the second working oil port is free from resistance conduction towards the second oil port.
Optionally, the hydraulic system further includes a first overflow valve and a second overflow valve, the first oil port is communicated with the second oil port through the first overflow valve, the first overflow valve has a first overflow state of a first overflow pressure and a second overflow state of a second overflow pressure, the second oil port is communicated with the first oil port through the second overflow valve, the second overflow valve has a third overflow state of a third overflow pressure and a fourth overflow state of a fourth overflow pressure, wherein the first overflow pressure is greater than the second overflow pressure, and the third overflow pressure is greater than the fourth overflow pressure.
Optionally, the rotary hydraulic system further includes a second oil pump, and an oil outlet of the second oil pump is communicated with the first control chamber of the first overflow valve.
Optionally, the hydraulic system further includes a second direction valve, the second direction valve is connected between the second oil pump and the first control chamber, and the second direction valve has an open state for communicating the second oil pump with the first control chamber and a closed state for blocking the second oil pump from the first control chamber.
Optionally, an oil outlet of the second oil pump is further communicated with a second control cavity of the second overflow valve, a third reversing valve is further connected between the second oil pump and the second control cavity, and the third reversing valve has an open state for communicating the second oil pump with the second control cavity and a closed state for blocking the second oil pump from the second control cavity.
Optionally, the rotary hydraulic system further comprises an oil tank, an oil inlet of the first oil pump is communicated with the oil tank, and a third overflow valve is further connected between an oil outlet of the second oil pump and the oil tank.
Optionally, the rotary hydraulic system further includes a third oil pump, a first check valve and a second check valve, the third oil pump is in one-way communication with the first oil port through the first check valve, and the third oil pump is in one-way communication with the second oil port through the second check valve.
Optionally, the rotary hydraulic system further includes an oil tank, an oil inlet of the first oil pump is communicated with the oil tank, and a fourth overflow valve is further disposed between the third oil pump and the oil tank.
Optionally, the first direction valve is an electromagnetic direction valve.
The utility model also provides a dig the rig soon, it includes: the rotary hydraulic system is described above.
The utility model has the advantages of it is following:
1. connect first sequence valve on the first hydraulic fluid port of rotary motor, connect the second sequence valve on the second hydraulic fluid port of rotary motor, first sequence valve and second sequence valve make hydraulic oil flow to the rotary motor when can unimpededly switch on, and first sequence valve and second sequence valve can provide stable backpressure when hydraulic oil flows back from the rotary motor, the oil return passageway of first sequence valve and second sequence valve is opened and is closed can not receive the influence that the oil feed pressure changes, make the rotary motor keep the steady state, the problem that the rotary process of rotary drilling rig among the prior art is unstable and leads to being difficult to the operation has effectively been solved, make the rotary process more stable.
2. The first sequence valve and the second sequence valve are one-way sequence valves, and when the oil supply pressure of the first oil pump is insufficient, the one-way sequence valves can prevent the hydraulic oil at the oil inlet of the rotary motor from flowing back, so that the pressure loss is avoided; meanwhile, the one-way sequence valve connected with the oil outlet of the rotary motor can continuously provide oil return back pressure, so that the rotary motor is prevented from stalling.
3. The rotary hydraulic system further comprises a third oil pump, a first check valve and a second check valve, when the rotary hydraulic system is started, the oil inlet of the rotary motor is connected with the high-pressure cavity, the oil outlet of the rotary motor is connected with the low-pressure cavity, when the rotary motor is started in a left-hand rotary mode or a right-hand rotary mode, the low-pressure cavity can be vacuumed, the third oil pump can continuously supplement hydraulic oil into the low-pressure cavity, and cavitation erosion of the low-pressure cavity can be effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic view of a rotary hydraulic system according to an embodiment of the present invention.
Description of reference numerals:
10. a rotary motor; 20. a first direction change valve; 30. a first oil pump; 41. a first sequence valve; 42. a second sequence valve; 51. a first overflow valve; 52. a second overflow valve; 61. a second oil pump; 62. a second directional control valve; 63. a third directional control valve; 64. a third overflow valve; 71. a third oil pump; 72. a first check valve; 73. a second check valve; 74. a fourth spill valve; 80. and an oil tank.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the swing hydraulic system of the present embodiment includes: the hydraulic control system comprises a rotary motor 10, a first reversing valve 20, a first oil pump 30, a first sequence valve 41 and a second sequence valve 42, wherein the rotary motor 10 is provided with a first oil port and a second oil port; the first reversing valve 20 is provided with an oil inlet, an oil return port, a first working oil port and a second working oil port, the first working oil port is communicated with the first oil port, and the second working oil port is communicated with the second oil port; the first oil pump 30 is communicated with the oil inlet; the first sequence valve 41 is connected between the first working oil port and the first oil port, so that the first working oil port is in unobstructed conduction towards the first oil port; the second sequence valve 42 is connected between the second working port and the second port such that the second working port is unobstructed toward the second port.
By applying the rotary hydraulic system of the embodiment, the first sequence valve 41 is connected to the first oil port of the rotary motor 10, the second sequence valve 42 is connected to the second oil port of the rotary motor 10, the first sequence valve 41 and the second sequence valve 42 enable hydraulic oil to be conducted to the rotary motor 10 without blocking, the first sequence valve 41 and the second sequence valve 42 can provide stable back pressure when the hydraulic oil flows back from the rotary motor 10, opening and closing of oil return channels of the first sequence valve 41 and the second sequence valve 42 cannot be affected by changes of oil inlet pressure, so that the rotary motor 10 is kept in a stable state, the problem that operation is difficult due to unstable rotary process of the rotary drilling rig in the prior art is effectively solved, and the rotary process is more stable.
Specifically, the first sequence valve 41 and the second sequence valve 42 are one-way sequence valves, and are formed by connecting one-way valve and one sequence valve in parallel, the one-way valves are in one-way communication, the sequence valves can set passing pressure according to different models, the flow area of the sequence valves is not affected by oil inlet pressure, the one-way valves in the first sequence valve 41 and the second sequence valve 42 are both in one-way communication towards the rotary motor 10, during rotation, one of oil ports of the rotary motor 10 is an oil inlet, and the other is an oil outlet, at this time, the first oil pump 30 supplies oil to the oil inlet of the rotary motor 10, and the one-way sequence valve connected with the oil outlet of the rotary motor 10 can continuously provide oil return back pressure to prevent the rotary motor 10 from stalling.
In this embodiment, the hydraulic swing system further includes a first overflow valve 51 and a second overflow valve 52, the first oil port is communicated with the second oil port through the first overflow valve 51, the first overflow valve 51 has a first overflow state of a first overflow pressure and a second overflow state of a second overflow pressure, the second oil port is communicated with the first oil port through the second overflow valve 52, the second overflow valve 52 has a third overflow state of a third overflow pressure and a fourth overflow state of a fourth overflow pressure, wherein the first overflow pressure is greater than the second overflow pressure, the third overflow pressure is greater than the fourth overflow pressure, when the first oil port is an oil inlet and the second oil port is an oil outlet, the first overflow valve 51 is in the first overflow state, the second overflow valve 52 is in the fourth overflow state, when the first oil port is an oil outlet and the second oil port is an oil outlet, the first overflow valve 51 is in the second overflow state, the second overflow valve 52 is in the third overflow state, the overflow valve communicated with the oil inlet is in a higher overflow pressure state, so that a large torque start is realized, when the second overflow valve is communicated with the second overflow pressure, the overflow valve is in a slow pressure release state, and a slow swing brake is realized.
In this embodiment, the swing hydraulic system further includes a second oil pump 61, an oil outlet of the second oil pump 61 is communicated with the first control cavity of the first overflow valve 51, when the second oil pump 61 supplies oil to the first control cavity, the first overflow valve 51 is in a first overflow state, when the second oil pump 61 stops supplying oil, the first overflow valve 51 is in a second overflow state, and the overflow pressure of the first overflow valve 51 can be adjusted through the second oil pump 61, so that the overflow pressure of the first overflow valve 51 can be switched between high and low, and the control manner is reliable and is quickly adjusted. It is understood that, as an alternative embodiment, the first relief valve 51 may be an electromagnetic relief valve, an electric proportional relief valve, or other relief valves capable of automatically adjusting the relief pressure.
In this embodiment, the hydraulic swing system further includes a second direction valve 62, the second direction valve 62 is connected between the second oil pump 61 and the first control chamber, the second direction valve 62 has an open state for communicating the second oil pump 61 with the first control chamber and a closed state for blocking the second oil pump 61 from the first control chamber, and the second direction valve 62 is switched between a conducting state and a non-conducting state to control whether the second oil pump 61 supplies oil to the first control chamber, so that the control mode is simple and reliable.
Preferably, the second direction valve 62 is a solenoid direction valve, which is sensitive to control and easy to install. It will be appreciated that, as an alternative embodiment, the second direction valve 62 may be a direct-acting solenoid valve, and may also be other types of valve bodies such as a pneumatic direction valve or a hydraulic direction valve.
In this embodiment, the oil outlet of the second oil pump 61 is further communicated with the second control chamber of the second overflow valve 52, a third direction valve 63 is further connected between the second oil pump 61 and the second control chamber, the third direction valve 63 has an open state for communicating the second oil pump 61 with the second control chamber and a closed state for blocking the second oil pump 61 from the second control chamber, and the second direction valve 62 and the third direction valve 63 are matched to change the overflow pressure matching of the first overflow valve 51 and the second overflow valve 52, so as to ensure that the slewing start-up process and the slewing stop process are stable and reliable.
Preferably, the third direction changing valve 63 is an electromagnetic direction changing valve, and is easy to control and install. It will be appreciated that, as an alternative embodiment, the second direction valve 62 may be a direct-acting solenoid valve, and may also be other types of valve bodies such as a pneumatic direction valve or a hydraulic direction valve.
In this embodiment, the hydraulic system further includes an oil tank 80, an oil inlet of the first oil pump 30 is communicated with the oil tank 80, a third overflow valve 64 is further connected between an oil outlet of the second oil pump 61 and the oil tank 80, the first oil pump 30 sucks hydraulic oil from the oil tank 80 and supplies the hydraulic oil, and when the oil supply pressure of the second oil pump 61 is too high, the third overflow valve 64 can play a role in pressure relief, so as to ensure the safety of the oil supply path of the second oil pump 61.
In this embodiment, the hydraulic system further includes a third oil pump 71, a first check valve 72 and a second check valve 73, the third oil pump 71 is in one-way communication with the first oil port through the first check valve 72, the third oil pump 71 is in one-way communication with the second oil port through the second check valve 73, when starting, the oil inlet of the rotary motor 10 is connected to the high-pressure chamber, the oil outlet is connected to the low-pressure chamber, when the rotary motor 10 starts to rotate left or right, the low-pressure chamber will have a suction phenomenon, the third oil pump 71 will continuously supply hydraulic oil to the low-pressure chamber, and cavitation in the low-pressure chamber can be effectively avoided.
In this embodiment, an oil inlet of the first oil pump 30 is communicated with the oil tank 80, a fourth overflow valve 74 is further disposed between the third oil pump 71 and the oil tank 80, and when the oil supply pressure of the third oil pump 71 is too high, hydraulic oil can flow back to the oil tank 80 through the fourth overflow valve 74, so as to perform a pressure relief function, thereby effectively protecting an oil supply path of the third oil pump 71.
In this embodiment, the first direction valve 20 is an electromagnetic direction valve, and the adjustment sensitivity is reliable by controlling the change of the conduction loop of the direction valve through an electromagnet.
Specifically, the first directional valve 20 is a three-position four-way directional valve, when the first oil port of the rotary motor 10 is fed with oil and the second oil port is fed with oil, the first directional valve 20 is located at the left position, and when the second oil port of the rotary motor 10 is fed with oil and the first oil port is fed with oil, the first directional valve 20 is located at the right position. Here, the "left position" refers to a position in a direction indicated by "left" in fig. 1, and the "right position" refers to a position in a direction indicated by "right" in fig. 1.
The utility model also provides a dig the rig soon, it includes: the rotary hydraulic system is described above.
The following describes a usage of the swing hydraulic system of the present embodiment:
left rotation: the first directional valve 20 is located at the left position, the first oil pump 30 supplies oil, hydraulic oil enters the first oil port of the rotary motor 10 through the first sequence valve 41, hydraulic oil flows out of the second oil port of the rotary motor 10, and the hydraulic oil flows back to the oil tank 80 through the second sequence valve 42; when the left slewing is started, the second reversing valve 62 is in an open state, the second oil pump 61 supplies oil, and the first overflow valve 51 is in a high overflow pressure state and provides high torque starting slewing for the left slewing; when the left rotation is stopped, the first reversing valve 20 is located at the middle position, the third reversing valve 63 is in the closed state, and the second overflow valve 52 is in the state of lower overflow pressure, so that the small torque is gently braked when the left rotation is stopped.
Turning right, the first reversing valve 20 is located at the right position, the first oil pump 30 supplies oil, hydraulic oil enters the second oil port of the turning motor 10 through the second sequence valve 42, hydraulic oil flows out of the first oil port of the turning motor 10, and the hydraulic oil flows back to the oil tank 80 through the first sequence valve 41; when the right slewing is started, the third reversing valve 63 is in an open state, the second oil pump 61 supplies oil, and the second overflow valve 52 is in a higher overflow pressure state, so that high-torque starting slewing is provided when the right slewing is started; when the right turn is stopped, the first direction valve 20 is located at the middle position, the second direction valve 62 is in the closed state, and the first relief valve 51 is in the state of lower relief pressure, so that the small torque is gently braked when the right turn is stopped.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:
1. the first sequence valve 41 is connected to a first oil port of the rotary motor 10, the second sequence valve 42 is connected to a second oil port of the rotary motor 10, the first sequence valve 41 and the second sequence valve 42 enable hydraulic oil to be conducted to the rotary motor 10 without resistance, the first sequence valve 41 and the second sequence valve 42 can provide stable back pressure when the hydraulic oil flows back from the rotary motor 10, oil return channels of the first sequence valve 41 and the second sequence valve 42 are opened and closed and cannot be affected by changes of oil inlet pressure, the rotary motor 10 is enabled to keep a stable state, and the rotary process is enabled to be more stable.
2. During the rotation action, the one-way sequence valve connected with the oil outlet of the rotation motor 10 can continuously provide oil return back pressure to prevent the rotation motor 10 from stalling.
3. When the rotary starting is carried out, the overflow valve communicated with the oil inlet channel is in a state of higher overflow pressure, so that the large-torque starting is realized during the rotary starting.
4. When the rotation is stopped, the overflow valve communicated with the oil return path is in a state of lower overflow pressure, and the overflow valve communicated with the oil return path is matched with the first reversing valve 20, so that the pressure is slowly released when the rotation is stopped, and the gentle braking is realized.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. A swing hydraulic system, comprising:
a rotary motor (10) having a first oil port and a second oil port;
the first reversing valve (20) is provided with an oil inlet, an oil return port, a first working oil port and a second working oil port, the first working oil port is communicated with the first oil port, and the second working oil port is communicated with the second oil port;
a first oil pump (30) communicated with the oil inlet;
the first sequence valve (41) is connected between the first working oil port and the first oil port, so that the first working oil port is in unobstructed conduction towards the first oil port;
and the second sequence valve (42) is connected between the second working oil port and the second oil port, so that the second working oil port is in unobstructed conduction towards the second oil port.
2. The rotary hydraulic system of claim 1, further comprising a first spill valve (51) and a second spill valve (52), the first port being in communication with the second port through the first spill valve (51), the first spill valve (51) having a first spill state of a first spill pressure and a second spill state of a second spill pressure, the second port being in communication with the first port through the second spill valve (52), the second spill valve (52) having a third spill state of a third spill pressure and a fourth spill state of a fourth spill pressure, wherein the first spill pressure is greater than the second spill pressure, and the third spill pressure is greater than the fourth spill pressure.
3. The swing hydraulic system according to claim 2, further comprising a second oil pump (61), an oil outlet of the second oil pump (61) being in communication with a first control chamber of the first spill valve (51).
4. The rotary hydraulic system according to claim 3, further comprising a second direction-changing valve (62), the second direction-changing valve (62) being connected between the second oil pump (61) and the first control chamber, the second direction-changing valve (62) having an open state communicating the second oil pump (61) with the first control chamber and a closed state blocking the second oil pump (61) with the first control chamber.
5. The rotary hydraulic system according to claim 3, characterized in that the oil outlet of the second oil pump (61) is further communicated with a second control chamber of the second relief valve (52), a third direction-changing valve (63) is further connected between the second oil pump (61) and the second control chamber, and the third direction-changing valve (63) has an open state communicating the second oil pump (61) with the second control chamber and a closed state blocking the second oil pump (61) with the second control chamber.
6. The rotary hydraulic system according to any one of claims 3 to 5, further comprising an oil tank (80), wherein an oil inlet of the first oil pump (30) is communicated with the oil tank (80), and a third overflow valve (64) is further connected between an oil outlet of the second oil pump (61) and the oil tank (80).
7. The rotary hydraulic system according to any one of claims 1 to 5, further comprising a third oil pump (71), a first check valve (72), and a second check valve (73), the third oil pump (71) being in one-way communication with the first port through the first check valve (72), the third oil pump (71) being in one-way communication with the second port through the second check valve (73).
8. The rotary hydraulic system according to claim 7, further comprising an oil tank (80), wherein an oil inlet of the first oil pump (30) is communicated with the oil tank (80), and a fourth relief valve (74) is further disposed between the third oil pump (71) and the oil tank (80).
9. The rotary hydraulic system according to any one of claims 1 to 5, characterized in that the first directional valve (20) is an electromagnetic directional valve.
10. A rotary drilling rig, comprising: a swing hydraulic system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222466311.XU CN218030864U (en) | 2022-09-16 | 2022-09-16 | Rotary hydraulic system and rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222466311.XU CN218030864U (en) | 2022-09-16 | 2022-09-16 | Rotary hydraulic system and rotary drilling rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218030864U true CN218030864U (en) | 2022-12-13 |
Family
ID=84355135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222466311.XU Active CN218030864U (en) | 2022-09-16 | 2022-09-16 | Rotary hydraulic system and rotary drilling rig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218030864U (en) |
-
2022
- 2022-09-16 CN CN202222466311.XU patent/CN218030864U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109779985A (en) | Gear pump control hydraulic control system of bender and its control method | |
| WO2021057727A1 (en) | Regeneration control hydraulic system | |
| CN111734701A (en) | Engineering machine, positive flow hydraulic system and control method thereof | |
| CN218030864U (en) | Rotary hydraulic system and rotary drilling rig | |
| CN207161404U (en) | The master winch control system and rotary drilling rig of rotary drilling rig | |
| US7080590B2 (en) | Valve arrangement and hydraulic drive | |
| US3746040A (en) | Directional control valve | |
| JP3101830B2 (en) | Hydraulic circuit of swivel working equipment | |
| CN213744202U (en) | Control system of hydraulic cylinder and excavator | |
| WO1990002267A1 (en) | Oil pressure feeder of work machine cylinder | |
| CN211844392U (en) | Hydraulic braking system and rotary drilling rig | |
| US4083381A (en) | Control valve | |
| JP2767482B2 (en) | Stack type hydraulic control valve device | |
| US3776273A (en) | Directional control valve | |
| CN217950836U (en) | Central rotary valve group assembly | |
| JP2010112493A (en) | Control device for working machine | |
| CN216867117U (en) | Mast type aerial work platform hydraulic system | |
| CN218581932U (en) | Pilot pressure reducing valve group, hydraulic system and operation machine | |
| CN217976788U (en) | Electronic control rotation control system and engineering vehicle | |
| CN217950822U (en) | Main hoisting valve group assembly | |
| EP0063025A1 (en) | Hydraulic control circuit for an hydraulic ram | |
| CN114439815B (en) | Test system and test host for rotary buffer valve | |
| CN214738393U (en) | Oil supplementing system of rotary motor and excavator | |
| JPH089441Y2 (en) | Hydraulic circuit | |
| CN218377103U (en) | Hydraulic oil supplementing loop system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |