阅读说明：本技术 一种快换液压系统 (Quick-change hydraulic system ) 是由 杨娟 谢朝阳 朱右东 刘亚 张安民 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种快换液压系统,包括补油泵、合流泵、多路阀、快换阀组、快换机具；补油泵或合流泵的供油管路与多路阀相连快换阀组设置多路阀和快换机具之间,与补油泵、合流泵、多路阀中的第一控制阀以及快换机具连通循环油路；快换阀组还包括内置的泄压油路,通过切换内置的换向阀切换循环油路和泄压油路,其中泄压油路包括匹配不同流量机具所设置的大流量泄压油路和小流量泄压油路,并根据切换的机具流量的大小切换对应的泄压油路。本发明通过所设置的快换阀组集成多个匹配不同流量的快换接头,能够实现具有不同流量的机具的快速切换,避免目前市场上整机快换接头处漏油的情况,同时降低作业人员的劳动强度,提高作业效率。(The invention discloses a quick-change hydraulic system which comprises an oil supplementing pump, a flow combining pump, a multi-way valve, a quick-change valve group and a quick-change machine tool, wherein the oil supplementing pump is connected with the flow combining pump through a pipeline; an oil supply pipeline of the oil supplementing pump or the merging pump is connected with the multi-way valve, is arranged between the multi-way valve and the quick-change machine tool and is communicated with a circulating oil way through the oil supplementing pump, the merging pump, a first control valve in the multi-way valve and the quick-change machine tool; the quick-change valve group also comprises a built-in pressure relief oil way, the circulating oil way and the pressure relief oil way are switched by switching the built-in reversing valve, the pressure relief oil way comprises a large-flow pressure relief oil way and a small-flow pressure relief oil way which are matched with different flow machines, and the corresponding pressure relief oil way is switched according to the flow of the switched machines. According to the invention, the quick-change valve bank is integrated with a plurality of quick-change connectors matched with different flows, so that the quick switching of machines with different flows can be realized, the oil leakage at the quick-change connector of the complete machine in the current market is avoided, the labor intensity of operators is reduced, and the operation efficiency is improved.)

1. A quick change hydraulic system is characterized in that: the device comprises an oil supplementing pump (1), a confluence pump (2), a multi-way valve (4), a quick change valve group (5) and a quick change machine tool (6);

an oil supply pipeline of the oil supplementing pump (1) or the combined flow pump (2) is connected with the multi-way valve (4), and the quick-change valve group (5) is arranged between the multi-way valve (4) and the quick-change tool (6) and communicated with a circulating oil way through the oil supplementing pump (1), the combined flow pump (2), a first control valve in the multi-way valve (4) and the quick-change tool (6);

the quick-change valve group (5) further comprises a built-in pressure relief oil way, the circulating oil way and the pressure relief oil way are switched by switching built-in reversing valves (11, 12), the pressure relief oil way comprises a large-flow pressure relief oil way and a small-flow pressure relief oil way which are matched with different flow machines, and the corresponding pressure relief oil way is switched according to the flow of the switched machines.

2. The quick-change hydraulic system according to claim 1, characterized in that: the quick-change valve group (5) comprises two parallel switching pipelines, each switching pipeline comprises one reversing valve (11, 12), one large-drift-diameter quick-change connector (13, 17) and one small-drift-diameter quick-change connector (14, 16), the large-drift-diameter quick-change connectors (13, 17) and the corresponding small-drift-diameter quick-change connectors (14, 16) are connected in parallel, one end of each switching pipeline is connected with the corresponding reversing valve (11, 12), and the other end of each switching pipeline is connected with the corresponding quick-change machine tool in a switching mode; and two switching ports of the reversing valves (11, 12) are respectively communicated with a pressure relief oil circuit and a circulating oil circuit.

3. The quick-change hydraulic system according to claim 2, characterized in that: when the machine tool is switched, the two parallel reversing valves (11, 12) in the switching pipeline are switched simultaneously, and the reversing valves (11, 12) switch the switching ports connected with the oil drainage ports and are communicated with the pressure relief oil way.

4. A quick-change hydraulic system according to claim 2 or 3, characterized in that:

when a small-flow machine tool is switched, the two switching pipelines simultaneously switch small-drift-diameter quick-change connectors (14 and 16), and meanwhile, the reversing valves (11 and 12) are communicated with oil drainage ports;

when a large-flow machine is switched, the two switching pipelines simultaneously switch the large-drift-diameter quick-change connectors (13 and 17), and meanwhile, the reversing valves (11 and 12) are communicated with oil drainage ports.

5. The quick-change hydraulic system according to claim 2, characterized in that: one switching port of each of the two reversing valves (11, 12) is connected to the same oil drainage port, and the other switching port is connected with the first function.

6. The quick-change hydraulic system according to claim 2, characterized in that: the quick-change valve group (5) further comprises a pressure relief quick-change connector (15), one end of the pressure relief quick-change connector (15) is connected with the quick-change machine tool (6), and the other end of the pressure relief quick-change connector is connected to the oil drainage port.

7. The quick-change hydraulic system according to claim 2, characterized in that: the circulating oil way further comprises two electromagnetic valves (4.1, 4.2), the two electromagnetic valves are communicated with the oil supplementing pump (1) and the first function connector, two reversing valves in the circulating oil way are switched and connected with the first function connector respectively to serve as an oil inlet pipeline and an oil return pipeline, and the electromagnetic valves connected with the oil return tank are connected with each other to serve as an oil return pipeline.

8. The quick-change hydraulic system according to claim 7, characterized in that: the flow combining pump (2) is selectively opened, the flow combining valve (3) is connected between the flow combining pump (2) and the multi-way valve (4), the flow combining valve (3) is opened when a large-flow machine is switched, and the flow combining valve (3) is closed when a small-flow machine is switched.

9. The quick-change hydraulic system according to claim 8, characterized in that: and the two circulating oil ways adopt large-drift-diameter quick change connectors (13 and 17).

10. The quick-change hydraulic system according to claim 1, characterized in that: the multi-way valve (4) adopts a triple method, and further comprises a tipping bucket oil cylinder (7) and a movable arm oil cylinder (8) which are respectively connected with a second function link and a third function link of the multi-way valve (4).

Technical Field

The invention belongs to the technical field of engineering machinery, and particularly relates to a quick-change hydraulic system.

Background

At present, machines for engineering operation such as loaders, skid loaders, backhoe loaders and the like at home and abroad are provided with various machines and tools for meeting different working conditions; when switching between machines, the quick-change couplings are particularly laborious to dock, or sometimes impossible to dock, because of the pressure in the system. The solution on the market at present: the first is to add a quick-change valve which is not integrated with a quick-change connector, but because the transition connectors are too many, the oil leakage condition at the quick-change connector is more; the second is to select the quick change coupler of self-relieving pressure, and the cost is higher and the effect is not good.

Disclosure of Invention

Aiming at the problem that machines and tools with different flow rates are not easy to switch in the engineering machinery loader in the prior art, the invention provides a quick-change hydraulic system suitable for a loader.

The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:

a quick-change hydraulic system comprises an oil supplementing pump, a flow combining pump, a multi-way valve, a quick-change valve group and a quick-change machine tool;

an oil supply pipeline of the oil supplementing pump or the flow combining pump is connected with the multi-way valve, and the quick-change valve group is arranged between the multi-way valve and the quick-change machine tool and is communicated with a circulating oil way through the oil supplementing pump, the flow combining pump, a first control valve in the multi-way valve and the quick-change machine tool;

the quick-change valve group also comprises a built-in pressure relief oil way, the circulating oil way and the pressure relief oil way are switched by switching the built-in reversing valve, the pressure relief oil way comprises a large-flow pressure relief oil way and a small-flow pressure relief oil way which are matched with different flow machines, and the corresponding pressure relief oil way is switched according to the flow of the switched machines.

As a further improvement of the present invention, the quick-change valve group comprises two parallel switching pipelines, each of the switching pipelines comprises one reversing valve, one large-bore quick-change connector and one small-bore quick-change connector, the large-bore quick-change connector and the corresponding small-bore quick-change connector are connected in parallel, one end of each of the large-bore quick-change connectors is connected with the reversing valve, and the other end of each of the large-bore quick-change connectors is connected with the quick-change machine in a switching manner; and two switching ports of the reversing valve are respectively communicated with the pressure relief oil way and the circulating oil way.

As a further improvement of the invention, when the machine tool is switched, the reversing valves in the two parallel switching pipelines are switched simultaneously, and the reversing valves switch the switching ports connected with the oil drainage ports and are communicated with the pressure relief oil path.

As a further improvement of the invention, when switching a small-flow machine, the two switching pipelines simultaneously switch the small-bore quick-change connector, and the reversing valve is communicated with the oil drain port;

when a large-flow machine is switched, the two switching pipelines simultaneously switch the large-drift-diameter quick-change connector, and the reversing valve is communicated with the oil drain port.

As a further improvement of the invention, one switching port of the two reversing valves is connected to the same oil drainage port, and the other switching port is connected with the first function.

As a further improvement of the invention, the quick-change valve group further comprises a pressure relief quick-change connector, one end of the pressure relief quick-change connector is connected with the quick-change tool, and the other end of the pressure relief quick-change connector is connected to the oil drain port.

As a further improvement of the present invention, the circulating oil path further includes two electromagnetic valves, the two electromagnetic valves communicate the oil replenishing pump and the first functional coupler, and the reversing valves in the two switching pipelines in the circulating oil path are switched and respectively connected with the first functional coupler to serve as an oil inlet pipeline and connected with the electromagnetic valve connected with the oil return tank to serve as an oil return pipeline.

As a further improvement of the invention, the confluence pump is selectively opened, and the confluence pump further comprises a confluence valve connected between the confluence pump and the multi-way valve, wherein the confluence valve is opened when a large-flow machine tool is switched, and the confluence valve is closed when a small-flow machine tool is switched.

As a further improvement of the invention, the two circulating oil paths adopt quick change connectors with large drift diameters.

As a further improvement of the invention, the multi-way valve adopts a triple method, and further comprises a tipping bucket oil cylinder and a movable arm oil cylinder which are respectively connected with the second function link and the third function link of the multi-way valve.

The invention has the beneficial effects that:

according to the quick-change hydraulic system, the quick-change valve group is integrated with the plurality of quick-change connectors matched with different flows, so that the quick switching of machines with different flows can be realized, the oil leakage at the quick-change connectors of the complete machine in the current market is avoided, the labor intensity of operators is reduced, and the operation efficiency is improved. In addition, the flow of the system is adjusted according to the flow of the running machine tool by controlling the configured flow-combining valve, so that the system is suitable for the requirements of various types of machine tools.

Drawings

FIG. 1 is a diagram of the structure of the oil path of the quick-change hydraulic system of the present invention

Fig. 2 is a structure diagram of an oil port of the quick-change valve group;

wherein: the hydraulic control system comprises a 1-oil supplementing pump, a 2-flow combining pump, a 3-flow combining valve, a 4-multi-way valve, a 5-quick-change valve group, a 6-quick-change machine tool, a 7-skip bucket oil cylinder, an 8-movable arm oil cylinder, a 9-working pump, a 10-hydraulic oil tank, 4.1, 4.2-electromagnetic valves, 11, 12-reversing valves, 13, 17-large-drift-diameter quick-change connectors, 14, 16-small-drift-diameter quick-change connectors and 15-pressure-relief quick-change connectors.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.

As shown in fig. 1, a quick-change hydraulic system includes an oil supply pump 1, a confluence pump 2, a confluence valve 3, a multi-way valve 4, a quick-change valve group 5, a quick-change tool 6, a skip cylinder 7, a boom cylinder 8, a working pump 9, a hydraulic oil tank 10, two solenoid valves 4.1,4.2, two reversing valves 11,12, two large-drift-diameter quick-change connectors 13,17, two small-drift-diameter quick-change connectors 14,16, and a pressure-relief quick-change connector 15. The hydraulic oil tank 10 is connected with the multi-way valve 4 through the working pump 9, the flow combining pump 2 is connected with the multi-way valve 4 through the flow combining valve 3, and the oil supplementing pump 2 is connected with the electromagnetic valve 4.1 and the electromagnetic valve 4.2.

The multi-way valve 4 is a triple valve and comprises a first control valve (multifunctional union) connected with a quick-change valve group 5, and the quick-change valve group is connected with a quick-change machine tool 6. The multi-way valve also comprises a second control valve (a movable arm linkage) connected with the movable arm oil cylinder 8 and a third control valve (a tipping bucket linkage) connected with the tipping bucket oil cylinder 7. The PS1 port and the PS2 port of the multi-way valve are connected with the outlet of the oil replenishing pump 1, and the O1 port and the O2 port of the multi-way valve are independently connected back to the oil tank.

The electromagnetic valves 4.1 and 4.2 are two-position three-way reversing valves and comprise oil paths connected with the oil replenishing pump 1, the quick change machine tool 6 and the multifunctional union.

The reversing valves 11 and 12 are two-position two-way manual reversing valves.

When the electromagnetic valve is not powered, the oil port P is communicated with the oil port T, oil of the confluence pump 2 is directly connected back to the oil tank through the T port, and the multi-function connection of the multi-way valve 4 can only be used for machines with small flow; when the electromagnetic valve is electrified, the oil port P is communicated with the oil port A, the oil coming from the confluence pump is converged with the multifunctional union of the multi-way valve 4 through the port P1, and the multifunctional union of the multi-way valve 4 can be used for machines and tools with large flow.

When the complete machine needs to quickly change the machines to work, one control mode is as follows: when the electromagnetic valve 4.1 is electrified, the oil ports a and C are communicated, the first control valve is switched to the left position, hydraulic oil enters the port C2 of the quick change valve group 5 through the port B1 of the multi-way valve 4, corresponding oil return is connected to the port A1 of the multi-way valve 4 through the port C1 of the quick change valve group 5, the electromagnetic valve 4.2 is not electrified at the moment, the oil ports d and e are communicated, oil in the valve core is returned to an oil tank through the port O2 of the multi-way valve through the electromagnetic valve 4.2, pressure relief is achieved, and the valve core is quickly reversed. Similarly, when the electromagnetic valve 4.1 is not electrified when reverse action is required, the electromagnetic valve 4.2 is electrified.

As shown in fig. 2, the specific oil path interface structure of the quick-change valve group 5 includes two directional valves 11,12, and when switching the machines, oil ports m and n are communicated, and oil ports i and j are communicated; a pair of quick change connectors 13 and 17 with large drift diameters are integrated, oil ports h and g are communicated, oil ports v and t are communicated, the oil port g is connected to the oil port m, and the oil port t is connected to the oil port j; the oil ports l and k are communicated, the oil ports s and r are communicated, the oil port k is connected to the oil port m, the oil port r is connected to the oil port j, and two pairs of quick-change connectors with different sizes are used for selecting machines with different flow rates; and a quick-change connector 15 for oil drainage is integrated, and oil ports p and o are communicated. A port C1 of the quick-change valve group 5 is connected with a port A1 of the multi-way valve 4, a port C2 of the quick-change valve group 5 is connected with a port B1 of the multi-way valve 4, a port T2 of the quick-change valve group 5 is connected with an oil return tank, a port D1 of the quick-change valve group 5 is connected with a port D3 of the quick-change tool 6, a port D2 of the quick-change valve group 5 is connected with a port D4 of the quick-change tool 6, and a port T1 of the quick-change valve group 5 is connected with a port T3 of the quick-change;

when a tool with large flow rate needs to be connected, for example, outlets D3 and D4 of a tool quick-change tool 6 with the flow rate of 50L/min-95L/min are sequentially connected with a pair of large-diameter quick-change connectors D1 and D2 of the quick-change valve group 5. When other machines with larger flow need to be replaced, two pairs of quick-change connectors are pushed, two manual reversing valves 11 and 12 in the quick-change valve group 5 are reversed, oil ports m are communicated with n, i is communicated with j, at the moment, oil ports h are communicated with g, oil ports v are communicated with T, the oil port g is connected to the oil port m, the oil port T is connected to the oil port j, and oil in the quick-change system and the quick-change machine tool system is returned to an oil tank through T2 of the quick-change valve group 5 through m-n and i-j, so that pressure relief is achieved. The operator can quickly change other large-flow machines. Similarly, the replacement of the low-flow machine tool is also operated according to the steps, such as the machine tool with the flow rate of 75L/min-145L/min, and the difference is that a pair of quick-change connectors E1 and E2 with small drift diameters are switched.

In addition, when the complete machine needs to operate the action of the movable arm, the handle or the button corresponding to the movable arm linkage can be operated. When the movable arm linkage of the multi-way valve 4 is at the right position, the oil from the working pump 9 enters the large cavity of the movable arm oil cylinder 8 through the port A3 of the multi-way valve to execute the arm lifting action; when the movable arm linkage of the multi-way valve 4 is at the left position, the oil from the working pump 9 enters the small cavity of the movable arm oil cylinder 8 through the port B3 of the multi-way valve to execute the arm falling action; when the movable arm linkage of the multi-way valve 4 is at the leftmost position, the large cavity and the small cavity of the movable arm oil cylinder are communicated with oil, and the movable arm oil cylinder is in a floating state. Similarly, the tipping action is also operated according to the steps.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.