Oil supply system for mutual emergency cranes

Abstract

The invention discloses an oil supply system for mutually emergency cranes, which comprises two oil supply devices and oil way systems, each oil way system is communicated with one oil supply device and one crane, each oil way system comprises an oil supply pipeline, an oil return pipeline and an oil drainage pipeline, and the three pipelines are respectively provided with a reversing valve for controlling the oil flow direction; when the reversing valve is at the normal position, the pipeline where the reversing valve is located is conducted, and oil is guided to the corresponding pipeline of the other oil way system after reversing; when any oil supply device breaks down, the reversing valve on the oil return pipeline and the oil drainage pipeline connected with the fault oil supply device is reversed, and the reversing valve on the oil supply pipeline connected with the normal oil supply device is reversed, so that the crane connected with the fault oil supply device can obtain oil supply, and the return oil and the drainage oil of the crane are guided to the normal oil supply device; according to the device, when any oil supply device in the two cranes cannot supply oil normally, the oil supply device of the other crane can supply oil.

Description

Technical Field

[0001] The present invention relates to a crane, in particular to an oil supply system for cranes that serve as an emergency for each other Background Art

[0002] Generally, when lifting larger objects, especially slender objects such as rails, two or more cranes are usually used to operate simultaneously. The cranes need an oil supply system to provide them with hydraulic oil as a power source.

[0003] The Chinese invention patent with publication number CN105438989B discloses a crane loading and unloading oil supply system, including: an oil supply module, a transfer module, an execution module and an oil integration module; the oil supply module is located in the unloading car, and can provide high-pressure oil for the oil supply system; the transfer module is located between the unloading car, connected with the oil supply module and the execution module, and can realize the normal transmission of oil between the unloading car and the unloading car during the rotation of the loading car; the execution module is located in the loading car or in the loading and unloading car, and can control the execution of the crane; the oil integration module is arranged on the oil circuit between the transfer module and the execution module, and can realize the oil supply of the oil supply module with one input and multiple outputs, multiple inputs and one output for oil return, and / or multiple inputs and one output for oil leakage. The invention of the crane loading and unloading oil supply system effectively reduces the number of transfer module channels, reduces the number of connecting pipelines, and has a simple layout. This optimization of the structure of the loading and unloading oil supply hydraulic system improves the compactness of the whole vehicle and also saves costs.

[0004] Although the above-mentioned oil supply system can supply oil to the crane and improve the compactness of the whole vehicle, the oil supply systems between different cranes are independent of each other, have no emergency function, and have poor maneuverability. When the oil supply module of the oil supply system of any crane fails, other cranes that have not yet been operated cannot provide emergency power to it in time, resulting in a waste of resources. It is also easy for safety accidents to occur because the faulty crane fails to obtain power support in time. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide an oil supply system for two cranes that can be used as an emergency crane when the oil supply device of one of the two cranes cannot supply oil normally, and the oil supply device of the other crane can supply oil.

[0006] Technical solution: The oil supply system for cranes that serve as an emergency for each other described in the present invention includes two oil supply devices and an oil circuit system, each oil circuit system is connected to an oil supply device and a crane, the oil circuit system includes pipelines for oil supply, oil return and oil leakage, and each of the three pipelines is provided with a reversing valve for controlling the direction of oil flow; when the reversing valve is in the normal position, the pipeline where it is located will divert the oil to the corresponding pipeline of the other oil circuit system after reversing; when any oil supply device fails, the reversing valve on the return and oil leakage pipelines connected to the failed oil supply device is reversed, and the reversing valve on the oil supply pipeline connected to the normal oil supply device is reversed to enable the crane connected to the failed oil supply device to obtain oil supply and divert its return and leakage oil to the normal oil supply device.

[0007] Based on the above technical scheme, when any oil supply device fails to supply oil, the reversing valve on the oil supply pipeline of another normal oil supply device will supply the oil in the oil tank of the normal oil supply device to the crane connected to the faulty oil supply device so that it can operate normally, and the reversing valve on the return oil and drain oil pipeline of the faulty oil supply device can divert the return oil and drain oil of the crane connected to the faulty oil supply device to the normal oil supply device, so that the crane connected to the faulty oil supply device can operate normally, and the oil in the oil supply device connected to the normal oil supply device will not be exhausted and can be circulated normally, thereby realizing the function of the oil supply devices connected to the two cranes being used for each other in an emergency, and the entire operation can be achieved by switching the working position of the corresponding reversing valve, which is simple and convenient to operate with high efficiency.

[0008] Preferably, the reversing valves on the oil supply, oil return and oil drain pipelines are respectively an oil supply reversing valve, an oil return reversing valve and an oil drain reversing valve.

[0009] Preferably, the oil supply reversing valve adopts a pilot solenoid valve, and an auxiliary reversing valve is connected between the pilot oil port of the oil supply reversing valve and the oil supply device; when the auxiliary reversing valve is in a normal position, the pilot oil port and the oil inlet of the oil drain reversing valve are connected, and after reversing, the oil supply device and the pilot oil port are connected to promote the reversing of the oil supply reversing valve.

[0010] An auxiliary reversing valve is set up to complete the switching of the valve core of the oil supply reversing valve through hydraulic assistance. When lifting objects of large tonnage, a large amount of oil supply is required, and under large flow conditions, a large current is required to switch the valve core position using an ordinary solenoid valve, which has high energy consumption. However, when a pilot solenoid valve is used, oil can be supplied through the pilot oil port to assist in pushing the valve core to switch direction. There is no need for a large current to drive the valve core to switch direction, which reduces energy consumption. An auxiliary reversing valve is set up to supply oil to its pilot oil port when the oil supply reversing valve needs to switch direction. When the oil supply reversing valve is in the normal position, the oil in its pilot oil port can be diverted back to the oil tank.

[0011] Preferably, a pilot pressure reducing valve is connected between the oil supply device and the auxiliary reversing valve, and the oil drain port of the pilot pressure reducing valve is connected to the oil inlet port of the oil drain reversing valve.

[0012] Setting a pilot pressure reducing valve can reduce the oil pressure. Generally, solenoid valves cannot withstand high pressure, and the pressure reducing valve can avoid damage to the solenoid valve core.

[0013] Preferably, a throttle valve is connected between the pilot pressure reducing valve and the oil tank.

[0014] Setting a throttle valve can reduce the workload of the pilot pressure reducing valve, reduce the flow of oil entering the auxiliary reversing valve, and avoid excessive oil flow through the auxiliary reversing valve when the oil supply reversing valve is switched, thereby increasing the difficulty of switching the auxiliary reversing valve.

[0015] Preferably, the oil return reversing valve is an electro-hydraulic reversing valve.

[0016] The oil return tank reversing valve adopts an electro-hydraulic reversing valve to adapt to the use scenarios of large flow rates. If an ordinary solenoid valve is used to face a large flow of return oil, the solenoid valve will be difficult to reverse and the energy consumption will be high.

[0017] Preferably, the oil return reversing valve comprises an electric valve and a hydraulic valve, and a pre-pressure valve for increasing the oil pressure at the oil inlet of the electric valve is provided between the oil inlets of the electric valve and the hydraulic valve.

[0018] A pre-pressure valve is set between the oil inlet of the electric valve and the hydraulic valve. In order to overcome the spring resistance of the pre-pressure valve, the oil pressure will increase, thereby increasing the oil pressure flowing into the solenoid valve. The oil output by the solenoid valve serves as the pilot oil of the hydraulic valve. The increased oil pressure can make the hydraulic valve easier to shift. In this way, there is no need to set up an additional pilot oil circuit to provide pilot oil to the electric valve separately to ensure that the oil pressure is large enough to achieve the reversal of the hydraulic valve. In addition, the pre-pressure valve has a one-way valve function to prevent oil backflow.

[0019] Preferably, the T port of the oil return reversing valve is connected to the oil inlet of the oil drain reversing valve.

[0020] The T port of the oil return reversing valve is connected with the oil inlet of the oil drain reversing valve so that the oil at the T port can be diverted back to the oil supply device, thereby preventing the oil pressure in the T port of the oil return reversing valve from hindering the reversing of the valve core.

[0021] Preferably, a one-way valve for preventing oil from flowing back to the oil supply device is provided between the oil supply reversing valve and the oil inlet of the crane.

[0022] A one-way valve is set between the oil supply reversing valve and the oil inlet of the crane to prevent the other oil supply device from supplying oil to the crane when the oil supply device to which it is connected fails to supply oil. The oil flows back to the faulty oil supply device through the oil supply reversing valve, reducing the oil volume of the normal oil supply device, making it impossible to build pressure and the crane unable to operate normally.

[0023] Preferably, a connecting valve is provided between the two oil supply devices.

[0024] Setting a connecting valve can balance the oil volume of the two oil supply devices, avoiding the situation where one oil supply device has too much oil and oil leaks due to a failure or leakage of the reversing valve, and the other oil tank is sucked empty.

[0025] Beneficial effects: Compared with the prior art, the present invention has significant beneficial effects: mainly, an oil supply reversing valve, an oil return reversing valve and an oil drain reversing valve are respectively arranged on the oil supply, oil return and oil drain pipelines, and the normal oil supply device can supply oil to the crane connected to the faulty oil supply device through valve core reversing, so that when either of the two oil supply devices fails, the other can be used as emergency power; secondly, the oil supply reversing valve adopts a pilot solenoid valve, and the oil return reversing valve adopts an electro-hydraulic reversing valve with an integrated pre-pressure valve, so that the system can be suitable for use scenarios with large oil volumes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the oil supply system of the present invention; Figure 2 It is a structural schematic diagram of the oil supply reversing valve; Figure 3 It is a structural schematic diagram of the oil return reversing valve; Figure 4 It is a structural schematic diagram of the oil leakage reversing valve. DETAILED DESCRIPTION

[0027] As shown in the figure, the oil supply system for mutually emergency cranes described in the present invention includes two oil supply devices 1 and an oil circuit system, each oil circuit system is connected to an oil supply device 1 and a crane, the oil circuit system includes an oil supply pipeline, an oil return pipeline and an oil drain pipeline, and the oil supply pipeline, the oil return pipeline and the oil drain pipeline are respectively connected with an oil supply reversing valve 2, an oil return reversing valve 3 and an oil drain reversing valve 4, the three reversing valves make the corresponding pipelines conductive when in the normal position, and after reversing, the oil is diverted to the corresponding pipeline of the other oil circuit system; when any oil circuit system cannot supply oil, the return oil reversing valve 3 and the oil drain reversing valve 4 of the faulty oil circuit system are reversed with the reversing valve 2 of the normal oil circuit system to make the crane connected to the faulty oil circuit system work.

[0028] The oil supply device 1 includes an oil tank and a plurality of hydraulic pumps for supplying oil to the oil circuit system.

[0029] The specific working states of the oil supply reversing valve 2, the oil return reversing valve 3 and the oil drain reversing valve 4 in the normal position and during reversal are: The oil supply reversing valve 2 conducts the oil supply pipeline where it is located when it is in the normal position. After reversing, the oil supply pipeline leading to another oil circuit system will supply oil to the crane connected to the other oil circuit system.

[0030] When the return oil reversing valve 3 is in the normal position, it guides the return oil of the crane connected to its oil circuit system to the oil tank of the oil supply device 1 connected to its oil circuit system. After reversing, it guides the return oil of the crane connected to its oil circuit system to the oil tank of another oil supply device 1.

[0031] When the oil leakage reversing valve 4 is in the normal position, it diverts the oil leakage of the crane and other reversing valves connected to its oil circuit system to the oil tank of the oil supply device 1 of its oil circuit system. After reversing, it diverts the oil leakage of the crane and other reversing valves connected to its oil circuit system to the oil tank of another oil supply device 1.

[0032] When any oil supply device 1 fails to supply oil, the return oil reversing valve 3, the oil leakage reversing valve 4 in the oil circuit system connected to the oil supply device 1 and the oil supply reversing valve 2 in the other oil circuit system are all switched so that the crane connected to the faulty oil supply device 1 can be supplied with oil and its return oil and leakage oil are diverted to the normal oil supply device 1.

[0033] Every two oil supply devices and the oil circuit system form an emergency whole, that is, the oil supply system provided by the present invention. When an oil supply failure occurs in one of the oil supply devices 1, the other oil supply device 1 can be used as a replacement oil supply device 1 to supply oil and power to the crane connected to the failed oil supply device 1. For the convenience of description, the two oil supply devices 1 are respectively referred to as I oil supply device and II oil supply device. The oil circuit system connected to each oil supply device 1, the reversing valve in the oil circuit system and the crane connected thereto are distinguished by adding a serial number I or II in front of them. The working status of the I oil supply device 1 and the connected components are described in detail below. The II oil supply device 1 and the connected components are the same, except that the corresponding serial numbers need to be swapped. Therefore, the working status of the II oil supply device 1 and the connected components will not be repeated.

[0034] A plurality of hydraulic pumps are arranged in the oil tank, and each hydraulic pump is individually connected to the P port of the oil supply reversing valve 2. The hydraulic pumps include a plunger pump 1-1, an emergency gear pump 1-2 and a manual emergency pump 1-3. Under normal circumstances, only the plunger pump 1-1 supplies oil to the P port of the oil supply reversing valve 2. When a fault occurs, the emergency gear pump 1-2 will take over its work. If the emergency gear pump 1-2 also fails, the manual emergency pump 1-3 can be manually opened to supply oil to the P port of the oil supply reversing valve 2. When all three hydraulic pumps fail, another oil supply device 1 is required to be used as emergency power.

[0035] The I oil supply reversing valve 2 adopts a two-position three-way pilot solenoid valve, the P port of the I oil supply reversing valve 2 is connected to the I oil tank, the A port is connected to the oil inlet of the I crane, and the B port is connected to the oil inlet of the II crane; a I check valve 9 is provided between the B port of the I oil supply reversing valve 2 and the A port of the II oil supply reversing valve 2, which is used to prevent the oil flowing out of the B port of the I oil supply reversing valve 2 from entering the II oil supply reversing valve 2, so that it can only flow to the II crane for oil supply; the I check valve 9 can also be arranged on the oil supply pipeline between the I oil supply reversing valve 2 and the I oil supply device 1; the I check valve 9 can also be not arranged, but it is necessary that when any oil supply reversing valve 2 is reversed, the other oil supply reversing valve 2 also changes direction; in the normal position, the P port of the I oil supply reversing valve 2 is connected to the A port, and the B port is closed. After the reversal, the P port is connected to the B port, and the A port is closed, that is, in the normal position, the I oil supply reversing valve 2 supplies oil to the I crane, and after the reversal, it supplies oil to the II crane.

[0036] An auxiliary reversing valve 5 is connected between the pilot oil port of the oil supply reversing valve 2 and the oil supply device 1. The auxiliary reversing valve 5 is a two-position three-way solenoid valve, whose P port is connected to the oil supply device 1, the A port is connected to the pilot oil port of the oil supply reversing valve 2, and the B port is connected to the P port of the oil leakage reversing valve 4. In the normal position of the auxiliary reversing valve 5, the A port is connected to the B port, and the P port is closed. After reversing, the P port is connected to the A port, and the B port is closed. In the normal position, the auxiliary reversing valve 5 guides the oil in the pilot oil port of the oil supply reversing valve 2 to the oil leakage reversing valve 4 to prevent the oil from being retained in the pilot oil port and hindering the oil supply reversing valve 2 from switching back to the normal position. After reversing, the auxiliary reversing valve 5 can supply oil to the pilot oil port to assist in pushing the valve core of the oil supply reversing valve 2 to reversing.

[0037] A pilot pressure reducing valve 6 may also be connected between the P port of the auxiliary reversing valve 5 and the oil supply device 1, and a throttle valve 7 may also be connected between the P1 port of the pilot pressure reducing valve 6, that is, the oil inlet, and the oil supply device 1 to limit the oil flow to the pilot pressure reducing valve 6; the P2 port of the pilot pressure reducing valve 6, that is, the oil outlet, is connected to the P port of the auxiliary reversing valve 5, and the L port of the pilot pressure reducing valve 6, that is, the oil drain port, is connected to the P port of the oil drain reversing valve 4, and the pilot pressure reducing valve 6 is used to limit the oil pressure of the oil flowing to the auxiliary reversing valve 5.

[0038] The oil return reversing valve 3 adopts an electro-hydraulic reversing valve including an electric valve and a hydraulic valve. The oil inlets of the electric valve and the hydraulic valve are connected to the total oil inlet of the oil return reversing valve 3, that is, the P port, that is, the oil inlets of the electric valve and the hydraulic valve are connected to each other. A pre-compression valve 8 for increasing the oil pressure at the oil inlet of the electric valve is provided between the oil inlet of the electric valve and the oil inlet of the hydraulic valve. The pre-compression valve 8 is a one-way valve structure that allows oil to flow from the P port of the oil return reversing valve to the oil inlet of the hydraulic valve in one direction. Because this process needs to overcome the resistance of the spring of the pre-compression valve 8, the oil pressure will increase, thereby increasing the oil pressure of the oil inlet of the electric valve, so as to ensure that the oil output by the electric valve can realize the reversal of the hydraulic valve as the pilot oil of the hydraulic valve.

[0039] The I electric valve and I hydraulic valve are two-position four-way reversing valves, and the P port and T port of the I electric valve and the I hydraulic valve are connected to the P port and T port of the I oil return reversing valve 3 respectively; the A port of the I electric valve is connected to the pilot oil port b of the I hydraulic valve, and the B port of the I electric valve is connected to the pilot oil port a of the I hydraulic valve, and the A port and B port of the I hydraulic valve are connected to the A port and B port of the I oil return reversing valve 3 respectively; when the I electric valve is in the normal position, the P port is connected to the A port, and the T port is connected to the B port. After reversing, the P port is connected to the B port, and the T port is connected to the A port; that is, when the I electric valve is in the normal position, oil is supplied to the pilot oil port b of the I hydraulic valve, so that the I hydraulic valve is in the normal position. When the I electric valve is reversed, oil is supplied to the pilot oil port a of the I hydraulic valve, so that the main valve core of the I hydraulic valve is reversed to complete the reversal of the I hydraulic valve.

[0040] The P port of the oil return reversing valve 3 is connected with the oil return port of the I crane, the T port of the oil return reversing valve 3 is connected with the P port of the I oil drain reversing valve 4, the A port of the I oil return reversing valve 3 is connected with the I oil tank, and the B port is connected with the II oil tank; when the I oil return reversing valve 3 is in the normal position, the P port is connected with the A port, and the B port is closed. After reversing, the P port is connected with the B port, and the A port is closed. That is, in the normal position, the I oil return reversing valve 3 diverts the return oil of the I crane to the I oil tank, and after reversing, the I oil return reversing valve 3 diverts the return oil of the I crane to the II oil tank.

[0041] The I oil leakage reversing valve 4 adopts a two-position three-way solenoid valve, and the P port of the I oil leakage reversing valve 4 is also connected to the oil leakage port of the I crane, the A port is connected to the I oil tank, and the B port is connected to the II oil tank; in the normal position, the P port of the I oil leakage reversing valve 4 is connected to the A port, and the B port is closed. After the reversal, the P port is connected to the B port, and the A port is closed. That is, in the normal position, the I oil leakage reversing valve 4 guides the oil leakage of the I oil supply reversing valve 2, the I oil return reversing valve 3 and the I crane back to the I oil tank, and guides the above leakage oil to the II oil tank after the reversal.

[0042] The two oil tanks are connected with a connecting valve 10. The connecting valve 10 is closed when the crane moves with the vehicle, travels on a slope or stops, to prevent excessive oil from flowing into the other tank due to shaking, causing oil leakage in the other tank, or one tank is in a high position and the other is in a low position, and too much oil from the high tank flows into the low tank, causing oil leakage. In other cases, the connecting valve can be opened to balance the oil volume of the two tanks to avoid the temporary pressure increase caused by the reversing of the reversing valve in the power mechanism when the crane is working, which impacts the oil supply reversing valve 2, the return oil reversing valve 3 or the oil leakage reversing valve 4, resulting in a slight deviation of the main valve core when the reversing is not required, causing oil to enter the other tank, which will lead to unbalanced oil volume in the two tanks in the long run. The connecting valve 10 can solve this problem. In addition, the reversing valve fails and cannot be reversed or the reversing is incomplete, which will also cause this problem, but the connecting valve 10 can only balance the oil volume within a certain flow rate. When the oil volume deviation of the two tanks increases too fast, the system still needs to be manually closed.

[0043] The oil supply reversing valve 2, the oil return reversing valve 3 and the oil drain reversing valve 4 may also be provided with a manual switching device, which can be manually switched when the electric device fails.

Claims

1. An oil supply system for cranes that serve as an emergency between each other, comprising two oil supply devices (1) and an oil circuit system, each oil circuit system connecting an oil supply device (1) and the crane, the oil circuit system comprising pipelines for oil supply, oil return and oil drain, characterized in that: Each of the three pipelines is provided with a reversing valve for controlling the direction of oil flow; the reversing valve conducts the pipeline in which it is located when in a normal position, and diverts the oil to the corresponding pipeline of another oil circuit system after reversing; when any oil supply device (1) fails, the reversing valve on the return oil and oil leakage pipeline connected to the failed oil supply device (1) is reversed, and the reversing valve on the oil supply pipeline connected to the normal oil supply device (1) is reversed to enable the crane connected to the failed oil supply device (1) to obtain oil supply and divert its return oil and leakage oil to the normal oil supply device (1).

2. The oil supply system for cranes used in an emergency situation according to claim 1, characterized in that: The reversing valves on the oil supply, oil return and oil drain pipelines are respectively an oil supply reversing valve (2), an oil return reversing valve (3) and an oil drain reversing valve (4).

3. The oil supply system for cranes used in an emergency situation according to claim 2, characterized in that: The oil supply reversing valve (2) adopts a pilot solenoid valve, and an auxiliary reversing valve (5) is connected between the pilot oil port of the oil supply reversing valve (2) and the oil supply device (1); when the auxiliary reversing valve (5) is in a normal position, the pilot oil port and the oil inlet of the oil drain reversing valve (4) are connected, and after reversing, the oil supply device (1) and the pilot oil port are connected to promote the reversing of the oil supply reversing valve (2).

4. The oil supply system for cranes serving as an emergency for each other according to claim 3, characterized in that: A pilot pressure reducing valve (6) is connected between the oil supply device (1) and the auxiliary reversing valve (5), and an oil drain port of the pilot pressure reducing valve (6) is connected to an oil inlet port of the oil drain reversing valve (4).

5. The oil supply system for cranes serving as an emergency for each other according to claim 4, characterized in that: A throttle valve (7) is connected between the pilot pressure reducing valve (6) and the oil supply device (1).

6. The oil supply system for cranes serving as an emergency for each other according to claim 2, characterized in that: The oil return reversing valve (3) is an electro-hydraulic reversing valve.

7. The oil supply system for cranes serving as an emergency for each other according to claim 6, characterized in that: The oil return reversing valve (3) comprises an electric valve and a hydraulic valve, and a pre-pressure valve (8) for increasing the oil pressure at the oil inlet of the electric valve is provided between the oil inlet of the electric valve and the oil inlet of the hydraulic valve.

8. The oil supply system for cranes serving as an emergency for each other according to claim 2, characterized in that: The T port of the oil return reversing valve (3) is in communication with the oil inlet port of the oil drain reversing valve (4).

9. The oil supply system for cranes serving as an emergency for each other according to claim 2, characterized in that: A one-way valve (9) is provided between the oil supply reversing valve (2) and the oil inlet of the crane, and is used to prevent oil from flowing back to the oil supply device (1).

10. The oil supply system for cranes serving as an emergency for each other according to claim 1, characterized in that: A connecting valve (10) is provided between the two oil supply devices (1).

Images