CN217377074U - Pressure flow control valve for crawler crane boom - Google Patents
Pressure flow control valve for crawler crane boom Download PDFInfo
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- CN217377074U CN217377074U CN202121117625.8U CN202121117625U CN217377074U CN 217377074 U CN217377074 U CN 217377074U CN 202121117625 U CN202121117625 U CN 202121117625U CN 217377074 U CN217377074 U CN 217377074U
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Abstract
A pressure flow control valve for a crawler crane boom. The problem of current super kiloton level crawler crane different load operating mode, different to system pressure flow demand is solved. The hydraulic control system comprises a main overflow valve, a first pressure control valve, a second pressure control valve, a first reversing valve, a second reversing valve, a third reversing valve, a speed regulating valve, a main oil inlet, a working oil port, an oil return port and a load sensitive interface, wherein the first reversing valve is arranged between the load sensitive interface and the first pressure control valve; the second reversing valve is arranged between the main oil inlet and the second pressure control valve; and the third reversing valve and the speed regulating valve are connected in parallel on a pipeline of the main oil inlet and the working oil port. The beneficial effects of the utility model are that, according to the different operating modes of different cantilever crane output cylinder, pressure flow control valve can control pressure level and flow size, fully guarantees output cylinder's operation stationarity and security, improves the work efficiency of product.
Description
Technical Field
The utility model relates to a hydraulic system, concretely relates to pressure flow control valve for crawler crane cantilever crane.
Background
The crane refers to a multi-action crane for vertically lifting and horizontally carrying heavy objects within a certain range. Also known as overhead traveling cranes, aviation cranes, cranes. The crawler crane is a mobile crane which is provided with a hoisting operation part on a crawler chassis and runs by a crawler device. Belongs to material handling machinery. For the majority of actions of the ultra-kiloton crawler crane, the actions are realized by driving an oil cylinder or a motor through a hydraulic system, for example, a frame lifting mechanism and an arm frame back-tilting prevention mechanism are realized by driving the oil cylinder.
The working condition of the crawler crane is complex, and the operation of the arm support is required in two main aspects in the normal hoisting process: 1. the stability of the boom operation is fully guaranteed, different working conditions are met, and the hydraulic system can provide different pressure limiting levels. 2. The operation efficiency is ensured, and the boom cylinder can realize two working conditions of light load, fast speed and heavy load, slow speed. Therefore, in order to meet different load working conditions of the ultra-kiloton crawler crane, the requirements on the pressure and the flow of the system are different, the hydraulic system is required to be capable of adjusting the pressure of the system in time according to the change of the load pressure, and the stability, the safety and the operation efficiency of the boom operation are ensured.
SUMMERY OF THE UTILITY MODEL
For solving the different load operating mode of current super kiloton level crawler crane among the background art, to the different problem of system pressure flow demand, the utility model provides a crawler crane is pressure flow control valve for cantilever crane.
The technical scheme of the utility model is that: a pressure flow control valve for a crawler crane boom comprises a main overflow valve, a first pressure control valve, a second pressure control valve, a first reversing valve, a second reversing valve, a third reversing valve, a speed regulating valve, a main oil inlet, a working oil port, an oil return port and a load sensitive interface, wherein the first reversing valve is arranged between the load sensitive interface and the first pressure control valve and is provided with a first position and a second position, the first position and the second position are separated, and the first position enables the load sensitive interface and the first pressure control valve to be communicated; the second reversing valve is arranged between the main oil inlet and the second pressure control valve and is provided with a first position for separating the main oil inlet from the second pressure control valve and a second position for communicating the main oil inlet with the second pressure control valve; and the third reversing valve and the speed regulating valve are connected in parallel on a pipeline of the main oil inlet and the working oil port.
As a further improvement, the main oil inlet is communicated with the working oil port through the speed regulating valve, and the third reversing valve is provided with a first position and a second position which are separated, wherein the first position and the second position are used for enabling the main oil inlet and the working oil port to be communicated.
As a further improvement of the utility model, the flow rate of the speed regulating valve is adjustable.
As a further improvement of the present invention, the flow through the third direction valve is larger than the flow through the speed control valve when the third direction valve is at the first position.
As a further improvement of the utility model, the first reversing valve, the second reversing valve and the third reversing valve are two-position two-way reversing valves.
As a further improvement of the utility model, the first reversing valve and the third reversing valve are normally open reversing valves, and the second reversing valve is a normally closed reversing valve.
As a further improvement of the present invention, the opening pressure of the first pressure control valve is smaller than the opening pressure of the second pressure control valve.
As a further improvement, the oil-out of main overflow valve, first pressure control valve, second pressure control valve all be linked together with the oil return opening, the opening pressure of main overflow valve is greater than the opening pressure of second pressure control valve.
The beneficial effects of the utility model are that, according to the different operating modes of different cantilever crane output cylinder, pressure flow control valve can control pressure level and flow size, fully guarantees output cylinder's operation stationarity and security, improves the work efficiency of product. The utility model discloses simple structure still has, convenient assembling, and the action is reliable, advantages such as long service life.
Drawings
Fig. 1 is a hydraulic schematic diagram of an embodiment of the present invention.
Fig. 2 is a hydraulic schematic diagram of the hydraulic flow control valve 8 of fig. 1.
In the figure, 1, a main overflow valve; 2. a first pressure control valve; 3. a second pressure control valve; 4. a first direction changing valve; 5. a second directional control valve; 6. a third directional control valve; 7. a speed regulating valve; 8. a pressure flow control valve; 9. a load-sensitive variable displacement pump; 10. an output oil cylinder; p1, main oil inlet; p2, a working oil port; t, an oil return port; x, load sensitive interface.
Detailed Description
The embodiments of the present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1 and fig. 2, a pressure and flow control valve for a boom of a crawler crane includes a main overflow valve 1, a first pressure control valve 2, a second pressure control valve 3, a first direction valve 4, a second direction valve 5, a third direction valve 6, a speed control valve 7, a main oil inlet P1, a working oil port P2, an oil return port T and a load-sensitive interface X, wherein the first direction valve is arranged between the load-sensitive interface and the first pressure control valve, and the first direction valve has a first position and a second position, wherein the first position and the second position are separated, and the first position and the second position are communicated with each other; the second reversing valve is arranged between the main oil inlet and the second pressure control valve and is provided with a first position for separating the main oil inlet from the second pressure control valve and a second position for communicating the main oil inlet with the second pressure control valve; and the third reversing valve and the speed regulating valve are connected in parallel on a pipeline of the main oil inlet and the working oil port. The beneficial effects of the utility model are that, according to the different operating modes of different cantilever crane output cylinder, pressure flow control valve can control pressure level and flow size, fully guarantees output cylinder's operation stationarity and security, improves the work efficiency of product. The utility model discloses simple structure still has, convenient assembling, and the action is reliable, advantages such as long service life. Specific theory, the utility model discloses integrated main overflow valve, pressure control valve, flow control valve (switching-over valve) and governing valve in an organic whole, realized pressure flow control's integrated control valve piece, through logic control, realized the pressure flow demand of the different loads of large-tonnage cantilever crane hydro-cylinder system.
The main oil inlet is communicated with the working oil port through a speed regulating valve, and the third reversing valve is provided with a first position and a second position, wherein the first position and the second position are used for enabling the main oil inlet and the working oil port to be communicated, and the second position is separated.
The load sensitive interface is connected with a load sensitive X port of the variable pump, the port P1 is connected with an oil outlet of the variable pump, and the port P2 is connected with an oil inlet of a reversing control valve of an output oil cylinder so as to control the action of the oil cylinder. The pressure of the first pressure control valve port is set to be lower and is used for remote pressure regulation control of the variable displacement pump, the main overflow valve serves as a general safety valve of the protection system, the pressure of the second pressure control valve is lower than that of the main overflow valve, and the pressure control valve is mainly used for pressure protection of the system when the oil cylinder bears the working condition. The quick oil supply under the low pressure and the slow oil supply under the high pressure of the output oil cylinder are realized by reversing the third reversing valve, and the stability, the safety and the operation efficiency of the boom operation are ensured.
The flow passing through the speed regulating valve is adjustable. Thus, the flow of the speed regulating valve can be regulated according to requirements. Taking an arm support of a kiloton-level crawler crane as an example, the set pressure of a main overflow valve 1 is 250bar, the opening pressure of a first pressure control valve 2 is 35bar, and the opening pressure of a second pressure control valve 3 is 200bar, that is, the first pressure control valve can be used for safety protection during low-pressure quick action, the second pressure control valve can be used for safety protection during high-pressure slow action, and the main overflow valve is used for general safety protection of a system. The flow of the speed regulating valve 7 is 20L/min, the value can be regulated in a small range, the flow of the third reversing valve 6 is 200L/min, namely the third reversing valve is in the first position under the low-pressure condition, low-pressure quick oil supply is realized, the safety efficiency of the product is improved, when the load is high-pressure, the third reversing valve is in the second position, the system is high-pressure at the moment, when the flow can only supply oil through the speed regulating valve, high-pressure slow action is realized, and the stability and the safety of the product are improved.
And when the third reversing valve is at the first position, the flow passing through the third reversing valve is larger than the flow passing through the speed regulating valve. Specifically, the first reversing valve, the second reversing valve and the third reversing valve are all two-position two-way reversing valves. More specifically, the first reversing valve and the third reversing valve are normally open reversing valves, and the second reversing valve is a normally closed reversing valve. More specifically, the cracking pressure of the first pressure control valve is smaller than the cracking pressure of the second pressure control valve. More specifically, oil outlets of the main overflow valve, the first pressure control valve and the second pressure control valve are communicated with an oil return port, and the opening pressure of the main overflow valve is greater than that of the second pressure control valve. The structure is convenient for realizing logic judgment quickly, so that the product can meet the pressure flow requirements of different loads of a large-tonnage boom cylinder system.
A control method comprises a load sensitive variable pump 9, an output oil cylinder 10 and a pressure flow control valve 8 for a crawler crane boom, wherein the load sensitive variable pump is connected with the output oil cylinder through the pressure flow control valve for the crawler crane boom;
under the low-pressure quick working condition: when the boom output oil cylinder needs low load to rapidly extend, the first reversing valve, the second reversing valve and the third reversing valve are not powered at the moment, the pressure of the output port of the load sensitive variable pump is a low pressure value, the third reversing valve is not powered, the flow is simultaneously supplied with oil through the large-flow third reversing valve and the small-flow speed regulating valve, the flow output to the boom output oil cylinder by the system is large at the moment, the pressure of the system is low, and the boom output oil cylinder is controlled to perform low-pressure rapid action;
under the high-pressure and low-speed working condition: when the boom output oil cylinder needs high load and stretches out slowly, the first reversing valve, the second reversing valve and the third reversing valve are all powered on, the third reversing valve is powered on, the flow is only supplied by the speed regulating valve, the flow is the set flow value of the speed regulating valve, the flow output to the boom output oil cylinder by the system is small, the pressure of the output port of the load sensitive variable pump is in a high-pressure state, and the boom output oil cylinder is controlled to perform high-pressure and slow-speed actions. The utility model discloses integrated main overflow valve, pressure control valve, flow control valve (switching-over valve) and governing valve in an organic whole, realized pressure flow control's integrated control valve piece, through logic control, realized the pressure flow demand of the different loads of large-tonnage cantilever crane hydro-cylinder system. According to different working conditions of different arm support oil cylinders, the pressure flow control valve can control the pressure grade and the flow, and the operation stability and the safety of the oil cylinder are fully guaranteed.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "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 the 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 the like 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 is to 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 as a specific case by those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The skilled person should understand that: although the present invention has been described in accordance with the above embodiments, the inventive concept is not limited to this embodiment, and any modification of the inventive concept will be included in the scope of the patent claims.
Claims (8)
1. A pressure flow control valve for a crawler crane boom is characterized by comprising a main overflow valve, a first pressure control valve, a second pressure control valve, a first reversing valve, a second reversing valve, a third reversing valve, a speed regulating valve, a main oil inlet, a working oil port, an oil return port and a load sensitive interface, wherein the first reversing valve is arranged between the load sensitive interface and the first pressure control valve and is provided with a first position enabling the load sensitive interface and the first pressure control valve to be communicated and a second position for isolating the load sensitive interface and the first pressure control valve; the second reversing valve is arranged between the main oil inlet and the second pressure control valve and is provided with a first position for separating the main oil inlet from the second pressure control valve and a second position for communicating the main oil inlet with the second pressure control valve; and the third reversing valve and the speed regulating valve are connected in parallel on a pipeline of the main oil inlet and the working oil port.
2. The pressure and flow control valve for the boom of the crawler crane as claimed in claim 1, wherein the main oil inlet is communicated with the working oil port through a speed regulating valve, and the third direction valve has a first position and a second position, wherein the first position and the second position are spaced, and the first position and the second position are communicated with each other.
3. The pressure and flow control valve for the crawler crane boom as recited in claim 2, wherein the flow passing through the speed regulating valve is adjustable.
4. The pressure and flow control valve for the boom of the crawler crane as recited in claim 2, wherein the flow rate through the third direction valve is greater than the flow rate through the speed control valve when the third direction valve is at the first position.
5. The pressure and flow control valve for the crawler crane boom as claimed in claim 1, wherein the first direction valve, the second direction valve and the third direction valve are two-position two-way direction valves.
6. The pressure and flow control valve for the crawler crane boom as claimed in claim 1, wherein the first and third direction valves are normally open direction valves, and the second direction valve is normally closed direction valve.
7. The pressure and flow control valve for the boom of the crawler crane as recited in claim 1, wherein the cracking pressure of the first pressure control valve is smaller than the cracking pressure of the second pressure control valve.
8. The pressure and flow control valve for the crawler crane boom according to claim 1, wherein oil outlets of the main overflow valve, the first pressure control valve and the second pressure control valve are all communicated with an oil return port, and the opening pressure of the main overflow valve is greater than the opening pressure of the second pressure control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121117625.8U CN217377074U (en) | 2021-05-24 | 2021-05-24 | Pressure flow control valve for crawler crane boom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121117625.8U CN217377074U (en) | 2021-05-24 | 2021-05-24 | Pressure flow control valve for crawler crane boom |
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| Publication Number | Publication Date |
|---|---|
| CN217377074U true CN217377074U (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121117625.8U Active CN217377074U (en) | 2021-05-24 | 2021-05-24 | Pressure flow control valve for crawler crane boom |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217377074U (en) |
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2021
- 2021-05-24 CN CN202121117625.8U patent/CN217377074U/en active Active
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