CN204386982U - A kind of lifting machine double pump hydraulic unloading power unit - Google Patents
A kind of lifting machine double pump hydraulic unloading power unit Download PDFInfo
- Publication number
- CN204386982U CN204386982U CN201420862411.7U CN201420862411U CN204386982U CN 204386982 U CN204386982 U CN 204386982U CN 201420862411 U CN201420862411 U CN 201420862411U CN 204386982 U CN204386982 U CN 204386982U
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- fluid port
- valve
- hydraulic fluid
- hydraulic
- pump
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of lifting machine double pump hydraulic unloading power unit, comprise centre valve block, be fixed on fuel tank and the motor at centre valve block two ends, in fuel tank centre valve block end face on be provided with the duplex pump and return tube that are connected with fuel sucking pipe, centre valve block sidewall installation system relief valve is communicated with vent line, described duplex pump side is provided with pilot relief valve assembly, the valve body of described pilot relief valve assembly is offered A hydraulic fluid port and B hydraulic fluid port, A hydraulic fluid port and B hydraulic fluid port respectively with the front pump oil outlet of duplex pump, after pump hydraulic fluid port be communicated with, A hydraulic fluid port is communicated with B hydraulic fluid port by oil road, oil road is provided with one-way valve, A hydraulic fluid port 21 is communicated with hydraulic control oil duct, hydraulic control oil duct is provided with hydraulic control spool, off-load oil duct is communicated with in B hydraulic fluid port, hydraulic control unloader valve is provided with after off-load oil duct, hydraulic control spool pushes away control hydraulic control unloader valve.After the utility model duplex pump, off-load opened by pump pilot relief valve, Low-pressure load discharge, and energy loss is little, reduces power of motor and size, energy saving.
Description
Technical field
The utility model relates to hydraulic system power unit field, is specifically related to a kind of lifting machine double pump hydraulic unloading power unit.
Background technique
In the elongated boom operation of lifting machine, forklift, require time unloaded that the rate of climb is very fast, during load, require that pressure-bearing is large, therefore provide the power unit of power to adopt duplex pump work, conventional design, when load is less than system unloaded force value, before and after duplex pump, pump works simultaneously, and the large rate of climb of flow is very fast, when load is greater than system unloaded force value, off-load opened by the rear pump relief valve of duplex pump, and pressure unloading is working pressure, and energy loss is large.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of lifting machine double pump pressurize hydraulic unloading power unit, when load be greater than rear pump setting unload charge values time, after duplex pump, off-load opened by pump pilot relief valve, pressure unloading is little, energy loss is little, reduces power of motor and size, energy saving.
The utility model is achieved through the following technical solutions:
A kind of lifting machine double pump hydraulic unloading power unit, comprise centre valve block, be fixed on fuel tank and the motor at centre valve block two ends, in fuel tank centre valve block end face on be provided with the duplex pump and return tube that are connected with fuel sucking pipe, centre valve block sidewall installation system relief valve is communicated with vent line, described duplex pump side is provided with pilot relief valve assembly, the valve body of described pilot relief valve assembly is offered A hydraulic fluid port and B hydraulic fluid port, A hydraulic fluid port and B hydraulic fluid port respectively with the front pump oil outlet of duplex pump, after pump hydraulic fluid port be communicated with, A hydraulic fluid port is communicated with B hydraulic fluid port by oil road, oil road is provided with one-way valve, A hydraulic fluid port 21 is communicated with hydraulic control oil duct, hydraulic control oil duct is provided with hydraulic control spool, off-load oil duct is communicated with in B hydraulic fluid port, hydraulic control unloader valve is provided with after off-load oil duct, hydraulic control spool pushes away control hydraulic control unloader valve.
The further improvement project of the utility model is, the valve body of described pilot relief valve assembly is provided with trimmer valve, and trimmer valve is communicated with oil duct.Trimmer valve is for getting rid of the air in oil duct.
The utility model further improvement project is, described centre valve block is provided with pair manual solenoid valve and the pressure-compensated valve that are communicated with oil circuit.
The utility model compared with prior art, has following obvious advantage:
The front and back pump of the utility model duplex pump is two force value, and when load is less than rear pump pressure unloading value, the duplex gear pump rate of climb that simultaneously works is very fast; When load is greater than rear pump pressure unloading value, after duplex gear pump, pump hydraulic control unloader valve opens off-load, and front pump works independently, and the rate of climb is comparatively slow, and pressure unloading is very little, and energy loss is little, reduces power of motor, the energy-conservation energy.
Accompanying drawing explanation
Fig. 1 is the utility model hydraulic schematic diagram.
Fig. 2 is the utility model hydraulic-controlled unloading overflow valve assembly sectional view.
Embodiment
As Fig. 1, shown in Fig. 2, the utility model comprises centre valve block, be fixed on fuel tank and the motor at centre valve block two ends, in fuel tank centre valve block end face on be provided with the duplex pump and return tube that are connected with fuel sucking pipe, centre valve block sidewall installation system relief valve 1 is communicated with vent line, described duplex pump side is provided with pilot relief valve assembly, the valve body of described pilot relief valve assembly is offered A hydraulic fluid port 21 and B hydraulic fluid port 22, A hydraulic fluid port 21 and B hydraulic fluid port 22 are respectively by front pump 3 oil outlet of hollow screw and duplex pump, rear pump 4 oil outlet is communicated with, A hydraulic fluid port 21 is communicated with by oil road 31 with B hydraulic fluid port 22, oil road 31 is provided with one-way valve 5, A hydraulic fluid port 21 is communicated with hydraulic control oil duct 32, and hydraulic control oil duct 32 is provided with hydraulic control spool 6, B hydraulic fluid port 22 and is communicated with off-load oil duct 33, and off-load oil duct 33 is provided with hydraulic control unloader valve 7, and hydraulic control spool 6 pushes away control hydraulic control unloader valve 7.
The valve body of described pilot relief valve assembly is provided with trimmer valve 8, and trimmer valve 8 is communicated with oil duct, as automatic control pressure vent.
Described centre valve block is provided with pair manual solenoid valve 9 and the pressure-compensated valve 10 that are communicated with oil circuit.
Working principle, as shown in Figure 1, 2, the load value that hydraulic control unloader valve setting is lower, when load value is less than setting, pump co-operation before and after driven by motor duplex pump, rear pump 4 hydraulic oil flows through B hydraulic fluid port 22, come together in A hydraulic fluid port 21 from oil road 31 through one-way valve 5 and enter centre valve block vent line together, and then promoting oil hydraulic cylinder rising, double pump flow is large, and the rate of climb is fast; When load is risen, reach hydraulic control unloader valve setting value, fluid enters hydraulic control oil duct 32, pass hydraulic control spool 6, open hydraulic control unloader valve 7, rear pump 4, from unloading oil duct 33 off-load, quits work, front pump 3 works independently, oil hydraulic cylinder high pressure rises slowly, rear pump Low-pressure load discharge, and energy loss is little, reduce power of motor, the energy-conservation energy.
Claims (3)
1. a lifting machine double pump hydraulic unloading power unit, comprise centre valve block, be fixed on fuel tank and the motor at centre valve block two ends, in fuel tank centre valve block end face on be provided with the duplex pump and return tube that are connected with fuel sucking pipe, centre valve block sidewall installation system relief valve (1) is communicated with vent line, it is characterized in that: described duplex pump side is provided with pilot relief valve assembly, the valve body of described pilot relief valve assembly is offered A hydraulic fluid port (21) and B hydraulic fluid port (22), A hydraulic fluid port (21) and B hydraulic fluid port (22) respectively with front pump (3) oil outlet of duplex pump, rear pump (4) oil outlet is communicated with, A hydraulic fluid port (21) is communicated with B hydraulic fluid port (22) by oil road (31), oil road (31) is provided with one-way valve (5), A hydraulic fluid port 21 is communicated with hydraulic control oil duct (32), hydraulic control oil duct (32) is provided with hydraulic control spool (6), in B hydraulic fluid port, (22) are communicated with off-load oil duct (33), off-load oil duct (33) is provided with hydraulic control unloader valve (7) afterwards, hydraulic control spool (6) pushes away control hydraulic control unloader valve (7).
2. a kind of lifting machine double pump hydraulic unloading power unit according to claim 1, is characterized in that: the valve body of described pilot relief valve assembly is provided with trimmer valve (8), and trimmer valve is communicated with oil duct.
3. a kind of lifting machine double pump hydraulic unloading power unit according to claim 1, is characterized in that: described centre valve block is provided with pair manual solenoid valve (9) and the pressure-compensated valve (10) that are communicated with oil circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420862411.7U CN204386982U (en) | 2014-12-31 | 2014-12-31 | A kind of lifting machine double pump hydraulic unloading power unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420862411.7U CN204386982U (en) | 2014-12-31 | 2014-12-31 | A kind of lifting machine double pump hydraulic unloading power unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204386982U true CN204386982U (en) | 2015-06-10 |
Family
ID=53359706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420862411.7U Expired - Fee Related CN204386982U (en) | 2014-12-31 | 2014-12-31 | A kind of lifting machine double pump hydraulic unloading power unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204386982U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106050762A (en) * | 2016-07-18 | 2016-10-26 | 江苏恒立液压科技有限公司 | Unloading hydraulic system |
| CN113374761A (en) * | 2021-06-18 | 2021-09-10 | 苏州艾沃意特汽车设备有限公司 | Vehicle lifter hydraulic control system, control circuit and lifter |
-
2014
- 2014-12-31 CN CN201420862411.7U patent/CN204386982U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106050762A (en) * | 2016-07-18 | 2016-10-26 | 江苏恒立液压科技有限公司 | Unloading hydraulic system |
| CN106050762B (en) * | 2016-07-18 | 2018-02-27 | 江苏恒立液压科技有限公司 | Off-load hydraulic system |
| CN113374761A (en) * | 2021-06-18 | 2021-09-10 | 苏州艾沃意特汽车设备有限公司 | Vehicle lifter hydraulic control system, control circuit and lifter |
| CN113374761B (en) * | 2021-06-18 | 2024-01-05 | 苏州艾沃意特汽车设备有限公司 | Hydraulic control system and control circuit of vehicle lifter and lifter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20181231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |