CN212928344U - Pilot control system and engineering machinery - Google Patents
Pilot control system and engineering machinery Download PDFInfo
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- CN212928344U CN212928344U CN202021852026.6U CN202021852026U CN212928344U CN 212928344 U CN212928344 U CN 212928344U CN 202021852026 U CN202021852026 U CN 202021852026U CN 212928344 U CN212928344 U CN 212928344U
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Abstract
The utility model relates to an engineering machine tool control system technical field especially relates to a pilot control system and engineering machine tool, and the pilot control system includes the pilot valve group, and the pilot valve group includes relief pressure valve, first overflow valve and off-load control valve, and the oil-out of pilot pump has first branch road and second branch road through first pipeline intercommunication, and first branch road communicates with the energy storage ware, and the second branch road communicates with the oil tank through first overflow valve, and the off-load control valve can be according to the break-make of the pressure control first overflow valve that charges of energy storage ware; an oil outlet of the working pump is communicated with a fourth branch and a fifth branch through a second pipeline, the fourth branch is communicated with the energy accumulator through a pressure reducing valve, and the fifth branch is communicated with the executing element through a working valve group. The utility model discloses a guide's pump and working pump are the energy storage ware fuel feeding in turn, make guide's pump be in low pressure off-load state for a long time, have effectively practiced thrift the energy, have avoided moreover because guide's pump lasts the high-pressure overflow and produces a large amount of heats, have saved the oil cooler, the cost is reduced.
Description
Technical Field
The utility model relates to an engineering machine tool control system technical field especially relates to a guide's control system and engineering machine tool.
Background
The existing pilot control system generally comprises a pilot pump, a one-way valve, an overflow valve, an oil cooler, a stop valve, an energy accumulator, a handle and a multi-way valve, wherein when the handle works, the stop valve is opened, the pilot pump absorbs oil from an oil tank, the oil goes to the handle and the energy accumulator through the one-way valve, the action of a working device is controlled, when the pilot pressure is greater than the set pressure of the overflow valve, the oil overflows from the overflow valve, and the oil returns to an oil tank after being cooled by the oil cooler. In order to ensure the normal opening of the pilot valve, the set pressure of the overflow valve is higher, and is generally 2.5 MPa. When the engine is started, the pilot pump can continuously supply oil, and when the handle is not operated, the pressure of the pilot pump can overflow only when the pressure reaches the overflow pressure, so that a large amount of heat is generated, and a large amount of power is consumed. On the other hand, for reducing to generate heat and increase devices such as oil cooler, increased system cost and tube coupling's the degree of difficulty.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a guide's control system and engineering machine tool has realized that guide's pump and working pump are the energy storage ware fuel feeding in turn, makes guide's pump be in low pressure off-load state for a long time, has effectively practiced thrift the energy, has avoided moreover because guide's pump lasts the high-pressure overflow and produces a large amount of heats, has saved the oil cooler, the cost is reduced.
To achieve the purpose, the utility model adopts the following technical proposal:
a pilot control system, comprising: the hydraulic control system comprises an oil tank, a pilot pump, a working pump, a pilot valve group, a working valve group, an execution element, an energy accumulator and a handle, wherein the pilot valve group comprises a pressure reducing valve, a first overflow valve and an unloading control valve;
an oil inlet of the pilot pump is communicated with the oil tank, an oil outlet of the pilot pump is communicated with one end of a first pipeline, the other end of the first pipeline is communicated with a first branch and a second branch, the first branch is communicated with the energy accumulator, the second branch is communicated with the oil tank through a first overflow valve, and the unloading control valve can control the on-off of the first overflow valve according to the charging pressure of the energy accumulator;
an oil inlet of the working pump is communicated with the oil tank, an oil outlet of the working pump is communicated with one end of a second pipeline, the other end of the second pipeline is communicated with a fourth branch and a fifth branch, the fourth branch is communicated with the energy accumulator through the pressure reducing valve, and the fifth branch is communicated with the executing element through the working valve group;
the energy accumulator is communicated with the oil inlet of the handle, and the oil outlet of the handle is communicated with the control end of the working valve group.
As a preferred technical scheme of the pilot control system, both ends of the first overflow valve are provided with control oil passages communicated with the second branch, wherein the control oil passage at the first end of the first overflow valve is further communicated with the oil tank through an unloading control oil passage, the unloading control valve is arranged on the unloading control oil passage, and the control end of the unloading control valve is communicated with the energy accumulator.
As a preferable technical solution of the pilot control system, the pilot valve group further includes a safety valve, the first pipeline is further communicated with a third branch connected in parallel with the first branch and the second branch, the third branch is communicated with an oil tank, the safety valve is disposed on the third branch, and an opening pressure of the safety valve is greater than a set upper limit pressure of the accumulator.
As a preferable technical scheme of the pilot control system, the safety valve is an overflow valve or a spring type check valve.
As a preferable technical solution of the pilot control system, the pilot valve group further includes a first check valve disposed on the first branch line, and the first check valve is configured to be unidirectionally conducted from the pilot pump to the accumulator.
As a preferable technical solution of the pilot control system, the pilot valve group further includes a second check valve, the second check valve is disposed on the fourth branch and located between the pressure reducing valve and the accumulator, and the second check valve is configured to be communicated from the pressure reducing valve to the accumulator in a one-way manner.
As a preferred technical scheme of a pilot control system, the working valve group comprises a first reversing valve and a second reversing valve, the executing element comprises a lifting oil cylinder and an inclined oil cylinder, a fifth branch is communicated with oil inlets of the first reversing valve and the second reversing valve, the fifth branch is communicated with the oil tank through a second overflow valve, a first working port of the first reversing valve is communicated with a rod cavity of the lifting oil cylinder, a second working port of the first reversing valve is communicated with a rodless cavity of the lifting oil cylinder, a first working port of the second reversing valve is communicated with a rod cavity of the inclined oil cylinder, a second working port of the second reversing valve is communicated with a rodless cavity of the inclined oil cylinder, and oil return ports of the first reversing valve and the second reversing valve are communicated with the oil tank.
As a preferable technical scheme of the pilot control system, an oil filter is arranged on a communication pipeline between the oil return ports of the first reversing valve and the second reversing valve and the oil tank.
A work machine comprising a pilot control system as claimed in any one of the preceding claims.
As a preferable technical scheme of the engineering machine, the engineering machine is a bulldozer.
The utility model has the advantages that:
the utility model provides a guide's control system has realized that guide's pump and working pump are the energy storage ware fuel feeding in turn, makes guide's pump be in low pressure off-load state for a long time, has effectively practiced thrift the energy, has avoided moreover because guide's pump lasts the high-pressure overflow and produces a large amount of heats, has saved the oil cooler, the cost is reduced.
Drawings
Fig. 1 is a hydraulic schematic diagram of a pilot control system according to an embodiment of the present invention.
In the figure:
10. an oil tank; 20. a pilot pump; 30. a working pump;
40. a pilot valve group; 41. a pressure reducing valve; 42. a first overflow valve; 421. an unloading control oil way; 43. an unloading control valve; 44. a safety valve; 45. a first check valve; 46. a second one-way valve;
50. a working valve group; 51. a first direction changing valve; 52. a second directional control valve;
60. a second overflow valve;
71. lifting the oil cylinder; 72. inclining the oil cylinder;
80. an accumulator; 90. a handle; 100. an oil filter.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the utility model provides a pilot control system, include: the hydraulic control system comprises an oil tank 10, a pilot pump 20, a working pump 30, a pilot valve group 40, a working valve group 50, an actuating element, an accumulator 80 and a handle 90, wherein the pilot valve group 40 comprises a pressure reducing valve 41, a first overflow valve 42 and an unloading control valve 43. An oil inlet of the pilot pump 20 is communicated with the oil tank 10, an oil outlet of the pilot pump 20 is communicated with one end of a first pipeline, the other end of the first pipeline is communicated with a first branch and a second branch, the first branch is communicated with the energy accumulator 80, the second branch is communicated with the oil tank 10 through a first overflow valve 42, and the unloading control valve 43 can control the on-off of the first overflow valve 42 according to the charging pressure of the energy accumulator 80. An oil inlet of the working pump 30 is communicated with the oil tank 10, an oil outlet of the working pump 30 is communicated with one end of a second pipeline, the other end of the second pipeline is communicated with a fourth branch and a fifth branch, the fourth branch is communicated with the energy accumulator 80 through the pressure reducing valve 41, and the fifth branch is communicated with the executing element through the working valve group 50. The energy accumulator 80 is communicated with an oil inlet of the handle 90, and an oil outlet of the handle 90 is communicated with a control end of the work valve group 50.
The utility model provides a guide's control system's theory of operation as follows:
when the handle 90 is not operated, the oil source of the pilot pump 20 charges the energy accumulator 80 through the first branch, when the charging pressure of the energy accumulator 80 reaches a set upper limit pressure (in the embodiment, the set upper limit pressure is 3.9MPa), the unloading control valve 43 controls the first overflow valve 42 to open, and the oil source of the pilot pump 20 is unloaded to the oil return tank 10 through the first overflow valve 42 at a low pressure (in the embodiment, the overflow pressure of the first overflow valve 42 is set to 0.3 MPa); at this time, the work valve group 50 is in the middle position function, and the oil source of the work pump 30 is unloaded to the oil tank 10 via the middle position function of the work valve group 50.
When the handle 90 is actuated, the oil source of the working pump 30 supplies oil to the working valve set 50 and the actuator through the fifth branch, so that the actuator is actuated. Because the handle 90 is operated by supplying oil to the handle 90 from the accumulator 80, the oil in the accumulator 80 is reduced and the pressure is reduced along with the operation of the handle 90, when the pressure of the accumulator 80 is reduced to a set lower limit pressure, the system can select the pilot pump 20 or the working pump 30 to charge the accumulator 80 according to the state of the working pump 30, specifically, if the working pump 30 does not supply oil to an execution element at the moment, the pilot pump 20 is started to charge the accumulator 80, and if the working pump 30 supplies oil to the execution element at the moment, the oil source of the working pump 30 is decompressed by the decompression valve 41 and then charges the accumulator 80. Therefore, the pilot pump 20 and the working pump 30 alternately supply oil to the energy accumulator 80, the pilot pump 20 is in a low-pressure unloading state for a long time, energy is effectively saved, a large amount of heat generated by continuous high-pressure overflow of the pilot pump 20 is avoided, an oil cooler is saved, and cost is reduced. In addition, the accumulator 80 serves as an oil source for the handle 90, and pulse-free impact can be achieved as compared with the case where the pilot pump 20 serves as an oil source.
In this embodiment, both ends of the first relief valve 42 are provided with control oil passages communicated with the second branch, wherein the control oil passage at the first end of the first relief valve 42 is further communicated with the oil tank 10 through an unloading control oil passage 421, the unloading control valve 43 is arranged on the unloading control oil passage 421, and the control end of the unloading control valve 43 is communicated with the accumulator 80. When the charging pressure of the energy accumulator 80 reaches the set upper limit value, the valve core of the unloading control valve 43 can move under the action of the oil pressure of the energy accumulator 80, so as to conduct the unloading control oil path 421, so that the control pressure at the first end of the first overflow valve 42 is reduced, at this time, the control pressure at the second end of the first overflow valve 42 is greater than the control pressure at the first end, the valve core of the first overflow valve 42 can move under the action of the control pressure at the second end, so that the first overflow valve 42 is opened, and the oil of the pilot pump 20 is unloaded back to the oil tank 10 through the low pressure of the first overflow valve 42.
The pilot valve group 40 further includes a first check valve 45 and a second check valve 46, the first check valve 45 is disposed on the first branch, the first check valve 45 is configured to be unidirectionally conducted from the pilot pump 20 to the accumulator 80, the second check valve 46 is disposed on the fourth branch and is located between the pressure reducing valve 41 and the accumulator 80, and the second check valve 46 is configured to be unidirectionally conducted from the pressure reducing valve 41 to the accumulator 80. By providing the first check valve 45 and the second check valve 46, the reverse flow of the oil in the accumulator 80 can be prevented.
The pilot valve group 40 further includes a safety valve 44, the first pipeline is further communicated with a third branch connected in parallel with the first branch and the second branch, the third branch is communicated with the oil tank 10, the safety valve 44 is arranged on the third branch, and the opening pressure of the safety valve 44 is greater than the set upper limit pressure of the energy accumulator 80. When the first overflow valve 42 is jammed, the oil in the pilot pump 20 can flow back to the oil tank 10 through the relief valve 44, and the system pressure is prevented from continuously rising. Alternatively, the relief valve 44 is a relief valve or a spring-loaded check valve, and the situation is shown in fig. 1 when the relief valve 44 is a spring-loaded check valve.
The working valve group 50 comprises a first reversing valve 51 and a second reversing valve 52, the executive component comprises an inclined oil cylinder 72 and a lifting oil cylinder 71, a fifth branch is communicated with oil inlets of the first reversing valve 51 and the second reversing valve 52, the fifth branch is also communicated with the oil tank 10 through a second overflow valve 60, a first working port of the first reversing valve 51 is communicated with a rod cavity of the lifting oil cylinder 71, a second working port of the first reversing valve 51 is communicated with a rodless cavity of the lifting oil cylinder 71, a first working port of the second reversing valve 52 is communicated with a rod cavity of the inclined oil cylinder 72, a second working port of the second reversing valve 52 is communicated with a rodless cavity of the inclined oil cylinder 72, and oil return ports of the first reversing valve 51 and the second reversing valve 52 are communicated with the oil tank 10. The actuator pressure (i.e., the system line pressure) is set by the second relief valve 60, and in this embodiment, the set pressure of the second relief valve 60 is 21 MPa. The valve cores of the first reversing valve 51 and the second reversing valve 52 can be controlled to move through the handle 90, so that different working positions of the first reversing valve 51 and the second reversing valve 52 are connected, oil feeding of rod cavities or rodless cavities of the tilting oil cylinder 72 and the lifting oil cylinder 71 is controlled, and different actions are completed. Preferably, an oil filter 100 is disposed on a communication pipeline between the oil return ports of the first and second direction changing valves 51 and 52 and the oil tank 10, so as to filter the system oil and ensure the cleanliness of the system oil.
The utility model also provides an engineering machine tool, include as above guide's control system. The working machine may be a bulldozer, but is not limited thereto.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A pilot control system, comprising: the hydraulic control system comprises an oil tank (10), a pilot pump (20), a working pump (30), a pilot valve group (40), a working valve group (50), an actuating element, an energy accumulator (80) and a handle (90), wherein the pilot valve group (40) comprises a pressure reducing valve (41), a first overflow valve (42) and an unloading control valve (43);
an oil inlet of the pilot pump (20) is communicated with the oil tank (10), an oil outlet of the pilot pump (20) is communicated with one end of a first pipeline, the other end of the first pipeline is communicated with a first branch and a second branch, the first branch is communicated with the energy accumulator (80), the second branch is communicated with the oil tank (10) through the first overflow valve (42), and the unloading control valve (43) can control the on-off of the first overflow valve (42) according to the charging pressure of the energy accumulator (80);
an oil inlet of the working pump (30) is communicated with the oil tank (10), an oil outlet of the working pump (30) is communicated with one end of a second pipeline, the other end of the second pipeline is communicated with a fourth branch and a fifth branch, the fourth branch is communicated with the energy accumulator (80) through the pressure reducing valve (41), and the fifth branch is communicated with the executing element through the working valve group (50);
the energy accumulator (80) is communicated with an oil inlet of the handle (90), and an oil outlet of the handle (90) is communicated with a control end of the working valve group (50).
2. The pilot control system according to claim 1, wherein both ends of the first relief valve (42) are provided with control oil passages communicated with the second branch, wherein the control oil passage at the first end of the first relief valve (42) is further communicated with the oil tank (10) through an unloading control oil passage (421), the unloading control valve (43) is arranged on the unloading control oil passage (421), and the control end of the unloading control valve (43) is communicated with the accumulator (80).
3. Pilot control system according to claim 1, characterised in that the pilot valve group (40) further comprises a safety valve (44), in that the first line is further connected to a third branch in parallel with the first and second branches, the third branch being connected to the tank (10), in that the safety valve (44) is arranged on the third branch, and in that the opening pressure of the safety valve (44) is greater than the set upper limit pressure of the accumulator (80).
4. The pilot control system according to claim 3, wherein the relief valve (44) is a relief valve or a spring-loaded check valve.
5. Pilot control system according to any one of claims 1-4, characterized in that the pilot valve group (40) further comprises a first one-way valve (45), which first one-way valve (45) is arranged on the first branch, which first one-way valve (45) is configured to be unidirectionally conducted by the pilot pump (20) to the accumulator (80).
6. Pilot control system according to one of claims 1-4, characterised in that the pilot valve group (40) further comprises a second one-way valve (46), which second one-way valve (46) is arranged in the fourth branch between the pressure reducing valve (41) and the accumulator (80), and which second one-way valve (46) is arranged to be in one-way communication from the pressure reducing valve (41) to the accumulator (80).
7. The pilot control system according to any one of claims 1 to 4, wherein the work valve group (50) comprises a first direction changing valve (51) and a second direction changing valve (52), the actuator comprises a lift cylinder (71) and a tilt cylinder (72), the fifth branch communicates with oil inlets of both the first direction changing valve (51) and the second direction changing valve (52), the fifth branch further communicates with the oil tank (10) through a second relief valve (60), a first working port of the first direction changing valve (51) communicates with a rod chamber of the lift cylinder (71), a second working port of the first direction changing valve (51) communicates with a rod chamber of the lift cylinder (71), a first working port of the second direction changing valve (52) communicates with a rod chamber of the tilt cylinder (72), and a second working port of the second direction changing valve (52) communicates with a rod chamber of the tilt cylinder (72), and oil return ports of the first reversing valve (51) and the second reversing valve (52) are communicated with the oil tank (10).
8. The pilot control system according to claim 7, wherein an oil filter (100) is provided on a communication line between the oil return ports of the first and second direction changing valves (51, 52) and the oil tank (10).
9. A working machine, characterized in that it comprises a pilot control system according to any one of claims 1-8.
10. The work machine of claim 9, wherein the work machine is a bulldozer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021852026.6U CN212928344U (en) | 2020-08-28 | 2020-08-28 | Pilot control system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021852026.6U CN212928344U (en) | 2020-08-28 | 2020-08-28 | Pilot control system and engineering machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212928344U true CN212928344U (en) | 2021-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021852026.6U Active CN212928344U (en) | 2020-08-28 | 2020-08-28 | Pilot control system and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212928344U (en) |
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2020
- 2020-08-28 CN CN202021852026.6U patent/CN212928344U/en active Active
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