Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank

A confluence valve and hydraulic pump technology, applied in cranes, fluid pressure actuating devices, mechanical equipment, etc., can solve problems such as cost reduction, limited pressure, and large specific weight, and achieve the effects of cost reduction, simplified line connection, and quantity reduction

Inactive Publication Date: 2011-06-15
XUZHOU HEAVY MASCH CO LTD
7 Cites 29 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The cost of the power source of the hydraulic system of the crane has a relatively large proportion in the cost of the whole crane. As mentioned above, in the prior art, the oil pump system for getting off the car needs to be equipped with five oil pumps in total, which is a large number. Obviously, the manufacturing cost of the corresponding main engine Second, the large number of oil pumps increases the difficulty of ge...
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Method used

In this embodiment, the third oil outlet A2 and the fourth oil outlet B2 can be connected with the selector valve. During normal working conditions, the third oil outlet A2 can be connected with the steering system oil passage of the vehicle through the selector valve. connected, the oil of the first hydraulic pump D1 flows out from the third oil outlet A2 of the confluence valve group to supply oil for the steering system when getting off the car, and the fourth oil outlet B2 communicates with the fuel tank through the selector valve, then the second The oil of the hydraulic pump D2 flows out from the fourth oil outlet B2 of the confluence valve group, and flows back to the oil tank through the selector valve; when the first hydraulic pump D1 does not work, the second reversing valve Y2 is stuck or other reasons cause When there is no action, the fourth oil outlet B2 communicates with the oil circuit of the alighting steering system through the selector valve, and the oil of the second hydraulic pump D2 flows out from the fourth oil outlet B2 of the confluence valve group to supply power to the alighting steering system. The oil is used as an emergency pump to ensure the reliable and stable operation of the crane.
The core of the present invention is to provide a kind of confluence valve group, this confluence valve group can make the pressure oil of two hydraulic pumps merge to the same oil outlet, work for corresponding load, thereby reduce the quantity of hydraulic pump in the hydraulic system . Another core of the present invention is to provide a multi-pump confluence hydraulic system for a crane.
The first check valve 1 can be set on the passage from the second reversing valve Y2 to the first main oil port of the first control valve C1 and the first main oil port of the second control valve C2, and the third reversing valve Y3 A second check valve 2 is provided on the passage to the first main oil port of the first control valve C1 and the first main oil port of the second control valve C2. Then the oil in the first oil inlet P1 and the oil in the second oil inlet P2 respectively pass through the first check valve 1 and the second check valve 2 to merge to the first main oil ports of the two control valves, which can Prevent the oil from flowing back, thereby maintaining the pressure of the combined oil.
The first priority flow speed regulating valve 7 can be set on the passage of the first oil inlet P1 and the second reversing valve Y2, and the second oil inlet P2 and the passage of the third reversing valve Y3 can be set Priority flow speed regulating valve 8. The priority flow speed regulating valve includes oil inlet, priority flow oil port and excess flow oil port. Under a set flow rate, when the oil supply of the pump does not exceed the flow required by the actuator, the excess flow oil port will not flow out , so as to ensure the smooth work of the actuator, and ...
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Abstract

The invention discloses a concurrent valve bank which is provided with a first oil outlet, a second oil outlet, a first oil inlet, a second oil inlet and an oil return port, and the valve body of the concurrent valve bank is internally provided with a first control valve, a second control valve and a first reversing valve; the on and off of the first control valve and the second control valve arecontrolled through the switching of the working position of the first reversing valve, so that the oil liquid which enters from the first oil inlet and the second oil inlet can flow out of a second main oil port of the first control valve and the second control valve, and then enters the load which is communicated with the first oil outlet and the second oil outlet. Thus the oil liquid output from two hydraulic pumps concurrently flows to the same oil outlet by virtue of the concurrent flow bank; and because the concurrent flow quantity of the oil liquid is greater, a larger amount of load work can be satisfied simultaneously, the number of the hydraulic pumps in a hydraulic system is reduced, the manufacturing cost is lowered, and the hydraulic system is simplified. The invention also discloses a multi-pump concurrent flow hydraulic system for a crane.

Application Domain

Technology Topic

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  • Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank
  • Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank
  • Multi-pump concurrent flow hydraulic system for crane and concurrent valve bank

Examples

  • Experimental program(1)

Example Embodiment

[0024] The core of the present invention is to provide a confluence valve group, which can make the pressure oil of two hydraulic pumps merge to the same oil outlet for corresponding load work, thereby reducing the number of hydraulic pumps in the hydraulic system. Another core of the present invention is to provide a multi-pump confluence hydraulic system for cranes.
[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] Please refer to figure 1 , figure 1 It is a working principle diagram of a specific implementation of the confluence valve group provided by the present invention.
[0027] The valve body of the converging valve group provided by the invention has a first oil inlet P1 and a second oil inlet P2. The first oil inlet P1 is connected with the pump oil port of the first hydraulic pump D1 in the hydraulic system. The second oil inlet P2 is connected with the pump oil port of the second hydraulic pump D2 in the hydraulic system, that is, the oil of the hydraulic system enters the converging valve group through the first oil inlet P1 and the second oil inlet P2. The valve body of the converging valve group is also provided with a first oil outlet A1 and a second oil outlet B1, and the oil entering the valve body from the oil inlet flows out from the oil outlet.
[0028] The valve body is also provided with a first control valve C1 and a second control valve C2, both of which have a first main oil port and a second main oil port, and control the first main oil port and the second main oil port. Control oil port; and the first main oil port of the first control valve C1 and the first main oil port of the second control valve C2 are both connected with the first oil inlet P1 and the second oil inlet P2, that is, the first hydraulic pump The oil from the second hydraulic pump D2 merges with the oil inlets of the first control valve C1 and the second control valve C2. In addition, the second main oil port of the first control valve C1 and the second control valve C2 are The two main oil ports are respectively communicated with the first oil outlet A1 and the second oil outlet B1. Therefore, the control oil port of the first control valve C1 and the control oil port of the second control valve C2 actually control the opening and closing of the first oil outlet A1 and the first control valve C1, and the second oil outlet B1 and the second oil outlet respectively. Two control valve C2 on and off.
[0029] The confluence valve group also includes a first reversing valve Y1. The valve body of the first reversing valve Y1 includes a first oil port, a second oil port, a third oil port, and a fourth oil port. In the first working position, The first oil port is connected to the third oil port, and the second oil port is connected to the fourth oil port. In the second working position, the first oil port is connected to the fourth oil port, and the second oil port is connected to the fourth oil port. The oil port is open. And the first oil port of the first reversing valve Y1 is connected with the first oil inlet P1 and the second oil inlet P2, that is, connected with the oil inlet; the second oil port is connected with the oil return port, such as figure 1 The first oil return port T1 shown, that is, the second oil port is connected to the oil tank; the third oil port and the fourth oil port are respectively connected with the control oil port of the first control valve C1 and the control oil port of the second control valve C2 .
[0030] Therefore, under the action of the first reversing valve Y1, the control oil port of the first control valve C1 communicates with the oil tank, and the control oil port of the second control valve C2 communicates with the oil inlet, or vice versa, the first control valve The control oil port of C1 is in communication with the oil inlet, and the control oil port of the second control valve C2 is in communication with the oil tank. When communicating with the oil tank, the chamber pressure corresponding to the control port of the first control valve C1 or the control port of the second control valve C2 is zero, and the first control valve C1 or the second control valve C2 is opened; it is connected to the oil inlet When the pressure in the chamber corresponding to the control oil port of the first control valve C1 or the control oil port of the second control valve C2 is the inlet pressure, the first control valve C1 or the second control valve C2 is closed.
[0031] Through this merging valve group, the oil from the two hydraulic pumps can merge to the first main oil port of the first control valve C1 and the first main oil port of the second control valve C2, because the first reversing valve Y1, the two control ports are in opposite working states, the first control valve C1 and the second control valve C2 are also in opposite working states, and the combined oil can only flow from the second main port of the first control valve C1 Or the second main oil port of the second control valve C2 flows out, and then enters the load communicating with the first oil outlet A1 or the load communicating with the second oil outlet B1. Therefore, the merging valve group can make the oil output from the two hydraulic pumps merge to the same oil outlet for corresponding load work. Because the merged oil pressure is higher, it can meet a larger number of load jobs at the same time, thereby reducing The number of hydraulic pumps in the hydraulic system reduces the production cost and simplifies the hydraulic system circuit connection.
[0032] The first control valve C1 and the second control valve C2 can be respectively figure 1 The first cartridge valve and the second cartridge valve shown in. The first reversing valve Y1 can be a solenoid valve. When the first reversing valve Y1 is not energized, the first control oil port of the first cartridge valve is connected to the oil inlet, and the pressure of the spring cavity is the same as the oil inlet. Then the first cartridge valve is closed, and its first main oil port is disconnected from the second main oil port; at this time, the second control oil port of the second cartridge valve is connected to the oil tank, and the pressure in the spring cavity is zero. The cartridge valve is opened, its first main oil port is connected with the second main oil port, and the confluent oil flows to the second main oil port and flows out from the second oil outlet B1 on the valve body. When the first reversing valve Y1 is energized, the working processes of the first cartridge valve and the second cartridge valve are reverse to the above. Cartridge valve has the advantage of large flow rate, which can improve the effect of confluence and reduce the heat of the system.
[0033] In another specific embodiment, the confluence valve group may further include a third oil outlet A2, a fourth oil outlet B2, a second reversing valve Y2, and a third reversing valve Y3. The second reversing valve Y2 and The third reversing valve Y3 has two working positions. When the second reversing valve Y2 is in the first working position, the first oil inlet P1 is connected to the third oil outlet A2 through the second reversing valve Y2. When the inlet reversing is in the second working position, the first oil inlet Port P1 communicates with the first main oil port of the first control valve C1 and the first main oil port of the second control valve C2; ​​when the third directional valve Y3 is in the first working position, the second oil inlet P2 passes through the third The reversing valve Y3 communicates with the fourth oil outlet B2. When the reversing is in the second working position, the second oil inlet P2 is connected to the first main oil port of the first control valve C1 and the first main oil port of the second control valve C2. The oil port is connected.
[0034] By setting the second reversing valve Y2 and the third reversing valve Y3, a third oil outlet A2 and a fourth oil outlet B2 can be added to the valve body, so that the oil passing through the converging valve group can be divided into more groups. The load provides power.
[0035] The first reversing valve Y1, the second reversing valve Y2, and the third reversing valve Y3 can all be solenoid valves, which is convenient for electrical system control and automation. Such as figure 1 As shown, the three reversing valves are all in a non-electric state. When the first oil outlet A1 is required to discharge oil, the electrical system controls the three reversing valves to be energized, and then the second reversing valve Y2 and the third The reversing valve Y3 is in the second working position. The oil from the first oil inlet P1 and the second oil inlet P2 merges to the first main oil port of the two control valves. After the valve Y1 is energized, the direction changes, the first cartridge valve is opened, the second cartridge valve is closed, and the combined oil flows out of the first oil outlet A1; when the second oil outlet B1 is required to discharge oil, it is controlled by the electrical system The second reversing valve Y2 and the third reversing valve Y3 are energized and reversing, and the first reversing valve Y1 is not energized, the first cartridge valve is closed, the second cartridge valve is opened, and the combined oil flows from the second The oil outlet B1 flows out; when the third oil outlet A2 and the fourth oil outlet B2 are required to discharge oil, the second reversing valve Y2 and the third reversing valve Y3 are not energized, then the second reversing valve Y2 and the second The three-way valve Y3 is in the first working position, the oil entering from the first oil inlet P1 flows out from the third oil outlet A2, and the oil entering from the second oil inlet P2 flows from the fourth oil outlet B2 Outflow.
[0036] The first check valve 1 and the third check valve Y3 to the first main oil port of the second control valve C2 can be provided in the passage from the second reversing valve Y2 to the first main oil port of the first control valve C1. A second check valve 2 is provided in the passage of the first main oil port of the control valve C1 and the first main oil port of the second control valve C2. Then the oil from the first oil inlet P1 and the oil from the second oil inlet P2 are merged to the first main oil ports of the two control valves through the first check valve 1 and the second check valve 2, respectively. Prevent the oil from flowing back, thereby maintaining the pressure of the confluent oil.
[0037] A first priority flow rate regulating valve 7 can be provided on the passage between the first oil inlet P1 and the second reversing valve Y2, and a second priority flow regulating valve can be provided on the passage between the second oil inlet P2 and the third reversing valve Y3. Speed ​​valve 8. Priority flow speed control valve includes oil inlet, priority flow port and excess flow port. Under a set flow, when the pump oil supply does not exceed the required flow of the actuator, there will be no flow out of the excess flow port , So as to ensure the smooth operation of the actuator, and when the pump oil supply exceeds the required flow of the actuator, the excess flow can flow back to the tank through the remaining flow port and the oil return port to prevent the excess flow from flowing away through the overflow valve. Thereby reducing the heating of the system. Such as figure 1 As shown, in order to facilitate the installation of internal parts of the valve body, a second oil return port T2 and a third oil return port T3 can be further provided to connect the remaining flow port of the first priority flow rate regulating valve 7 to the second reversing valve Y2 , Through the second reversing valve Y2 to communicate with the second oil return port T2, the remaining flow port of the second priority flow rate regulating valve 8 is connected to the third reversing valve Y3, through the third reversing valve Y3 and the third oil return Port T3 is connected. The first priority flow speed regulating valve 7 and the second priority flow speed regulating valve 8 are specifically three-way priority speed regulating valves. By making full use of the advantages of the priority flow, the system heats up and the energy loss is reduced.
[0038] In another specific embodiment, a third check valve 3 and a fourth check valve 4 may be further provided in the confluence valve group, and the third check valve 3 conducts the second oil return port T2 with the first oil inlet. Port P1, the fourth one-way valve 4 conducts the third oil return port T3 and the second oil inlet P2. When making a sharp turn, the oil intake of the first oil inlet P1 and the second oil inlet P2 is not enough to supplement the oil required by the actuator. When the actuator generates negative pressure, the oil in the oil tank can pass through the second oil return Port T2 and the third oil return port T3 flow back to the oil inlet path of the first oil inlet P1 and the oil inlet path of the second oil inlet P2, so as to achieve the purpose of replenishing oil for the system and prevent the suction of the actuator .
[0039] A first relief valve 5 and a second relief valve 6 may also be provided in the confluence valve group. The first relief valve 5 communicates with the first oil inlet P1 and the second oil return port T2, and the second relief valve 6 communicates with the second oil return port. The second oil inlet P2 and the third oil return port T3.
[0040] When the valve block or other reasons cause the outlet oil circuit on the valve block to be blocked, in order to prevent the hydraulic oil from overflowing from the main overflow valve at the outlet of the pump, forming a high pressure overflow, increasing the heat generation of the system, by setting the first overflow Valve 5 and the second relief valve 6, the pressure settings of the two relief valves are lower than the main relief valve, then a part of the high-pressure oil can be overflowed through the first relief valve 5 and the second relief valve 6 respectively It flows back to the oil tank to reduce the heat of the system; in addition, when the pressure of the oil flowing through the valve body is too high during operation, part of the oil can also pass through the first relief valve 5 and the second relief valve 6 It overflows back to the tank to limit the maximum working pressure of the hydraulic system, which can prevent system overload and act as a safety valve.
[0041] The present invention also provides a multi-pump confluence hydraulic system for cranes, including a valve group, and a first hydraulic pump D1 and a second hydraulic pump D2 that are connected to the oil inlet of the valve group. The valve group is any one of the above embodiments. The mentioned confluence valve group.
[0042] Please refer to figure 2 , figure 2 It is a schematic diagram of the working process of a specific implementation of the multi-pump confluence hydraulic system provided by the present invention.
[0043] The oil flowing out of the first oil outlet A1 can supply oil for the outriggers and the actuators of the oil and gas suspension; the oil flowing from the second oil outlet B1 can be used for the turning of the car, the counterweight, and the turning of the control room. The actuators for turntable lock and jib rotation are supplied with oil. The oil circuits of the latter four actuators can be controlled by a four-way valve. Since these two sets of actuators do not need to work at the same time, the first hydraulic pump D1 and the second hydraulic pump D2 can increase the flow of oil supply by merging, and supply oil for multiple actuators.
[0044] In addition, a third oil outlet A2 and a fourth oil outlet B2 may be provided, both of which supply oil for the actuators of the off-vehicle steering. The flow rate required by the off-truck steering system is low, but the steering has a great impact on the safety of the traveling crane. Therefore, although a single pump can work when off-truck and steering, an emergency pump can also be provided.
[0045] image 3 It is a diagram of the working principle of the selector valve in another specific embodiment of the multi-pump confluence hydraulic system provided by the present invention.
[0046] In this embodiment, the third oil outlet A2 and the fourth oil outlet B2 can be connected to the selector valve. In normal working conditions, the third oil outlet A2 is connected to the oil circuit of the off-car steering system through the selector valve. The oil of the first hydraulic pump D1 flows out from the third oil outlet A2 of the confluence valve group to supply oil to the steering system of the off-car, and the fourth oil outlet B2 is connected to the oil tank through the selector valve, the second hydraulic pump D2 The oil flows out from the fourth oil outlet B2 of the confluence valve group and flows back to the oil tank through the selector valve; when the first hydraulic pump D1 does not work, the second reversing valve Y2 is stuck or other reasons cause no reversing action , The fourth oil outlet B2 is connected with the oil circuit of the off-car steering system through the selector valve, and the oil of the second hydraulic pump D2 flows out from the fourth oil outlet B2 of the confluence valve group to supply oil to the off-car steering system as The emergency pump is used to ensure the reliable and stable operation of the crane.
[0047] The confluence valve set provided by the present invention and the multi-pump confluence hydraulic system for cranes have been introduced in detail above. Specific examples are used in this article to describe the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
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