Tower crane jacking hydraulic system capable of realizing slow jacking and quick resetting

Abstract

The utility model discloses a tower crane jacking hydraulic system capable of realizing slow jacking and quick resetting, and relates to the technical field of cranes. The hydraulic system comprises an oil cylinder, a balance valve set connecting oil way, a pressure gauge, a one-way valve, a plunger pump, a motor, a multi-stage electro-hydraulic pilot overflow valve and an oil tank which are connected, and a two-way two-position electromagnetic valve is connected between the oil cylinder and the oil tank. The balance valve set connecting oil way is jointly connected with a stacked type double one-way throttle valve, a stacked type one-way throttle valve, a second three-position four-way electromagnetic valve and an electro-hydraulic reversing valve. And the two balance valve groups are connected with the oil path, so that the retraction speed is increased, and the working efficiency is greatly improved. The integrated valve group is provided with an anti-explosion valve, when a balance valve fails, oil is supplied through a double-pump and double-motor combination, and the jacking efficiency is high; when one pump motor set fails, it can still be guaranteed that jacking work is completed at the original half speed, and the risk of high-altitude maintenance is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a tower crane jacking hydraulic system capable of realizing slow jacking and fast resetting. Background Technique

[0002] At present, the installation of wind power equipment increasingly relies on luffing tower cranes. This is because the independent height of wind power equipment is high and the overall hoisting weight is heavy. Basically, the installation of one wind power generation equipment can be completed by one or two hoisting operations. At this time, it is necessary to disassemble the tower and shift it to install the next fan, which requires the jacking oil cylinder to jack smoothly and slowly and retract the cylinder quickly, so as to improve the working efficiency of the tower crane jacking and adding standard sections. Content of the Utility Model

[0003] To solve the above problems, that is, to solve the problems proposed in the above background technique, the utility model provides a tower crane jacking hydraulic system capable of realizing slow jacking and fast resetting, which includes a hydraulic system. The hydraulic system includes a pair of oil cylinders, a balance valve group connection oil circuit, a pressure gauge, a pair of one-way valves, a pair of plunger pumps, a pair of motors, a multi-stage electro-hydraulic pilot relief valve and a fuel tank connected. A pair of two-way two-position solenoid valves are connected between a pair of the oil cylinders and the fuel tank. The balance valve group connection oil circuit includes a first balance valve group connection oil circuit and a second balance valve group connection oil circuit. The first balance valve group connection oil circuit and the second balance valve group connection oil circuit are jointly connected with a stacked double one-way throttle valve, a stacked one-way throttle valve, a second three-position four-way solenoid valve and an electro-hydraulic reversing valve.

[0004] The further setting of the utility model is that the first balance valve group connection oil circuit includes a first balance valve group, and the first balance valve group is connected with a first high-pressure ball valve, a second high-pressure ball valve, a third high-pressure ball valve and a fourth high-pressure ball valve. The first high-pressure ball valve and the second high-pressure ball valve are connected with a first three-position four-way solenoid valve, and the third high-pressure ball valve and the fourth high-pressure ball valve are connected with the stacked double one-way throttle valve and the stacked one-way throttle valve.

[0005] The further setting of the utility model is that the second balance valve group connection oil circuit includes a second balance valve group, and the second balance valve group is connected with a fifth high-pressure ball valve, a sixth high-pressure ball valve, a seventh high-pressure ball valve and an eighth high-pressure ball valve. The seventh high-pressure ball valve and the eighth high-pressure ball valve are connected with a third three-position four-way solenoid valve, and the fifth high-pressure ball valve and the sixth high-pressure ball valve are connected with the stacked double one-way throttle valve and the stacked one-way throttle valve.

[0006] The beneficial technical effects of the present utility model are as follows: The combined oil supply of double pumps and double motors is adopted, and the jacking efficiency is high; when a set of pump-motor units fails, it can still ensure to complete the jacking work at half of the original speed, avoiding the risk of maintenance at high altitude; in the no-load working condition, two oil return circuits are arranged at the large chamber, which improves the retraction speed and greatly improves the working efficiency; compared with the traditional synchronous valve hydraulic system, this system has higher stability during the loading and jacking process. Brief Description of the Drawings

[0007] Figure 1 The schematic diagram of the tower crane jacking hydraulic system showing slow jacking and fast reset is shown.

[0008] Reference Signs: 1. Oil cylinder, 2. First balance valve group, 21. Second balance valve group, 3. Two-way two-position solenoid valve, 4. First high-pressure ball valve, 41. Second high-pressure ball valve, 42. Third high-pressure ball valve, 43. Fourth high-pressure ball valve, 44. Fifth high-pressure ball valve, 45. Sixth high-pressure ball valve, 46. Seventh high-pressure ball valve, 47. Eighth high-pressure ball valve, 5. Stacked double one-way throttle valve, 6. Stacked one-way throttle valve, 7. First three-position four-way solenoid valve, 71. Second three-position four-way solenoid valve, 72. Third three-position four-way solenoid valve, 8. Electro-hydraulic reversing valve, 9. Pressure gauge, 10. Check valve, 11. Plunger pump, 12. Motor, 13. Multi-stage electro-hydraulic pilot overflow valve, 14. Oil tank. Detailed Embodiments

[0009] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0010] The utility model provides a tower crane jacking hydraulic system capable of realizing slow jacking and fast resetting, which comprises a hydraulic system. The hydraulic system is connected with a pair of oil cylinders 1, an oil circuit connecting a balance valve group, a pressure gauge 9, a pair of one-way valves 10, a pair of plunger pumps 11, a pair of motors 12, a multi-stage electro-hydraulic pilot overflow valve 13 and an oil tank 14. A pair of two-way two-position solenoid valves 3 are connected between the pair of oil cylinders 1 and the oil tank 14. The oil circuit connecting the balance valve group includes a first oil circuit connecting the balance valve group and a second oil circuit connecting the balance valve group. The first oil circuit connecting the balance valve group and the second oil circuit connecting the balance valve group are jointly connected with a stacked double one-way throttle valve 5, a stacked one-way throttle valve 6, a second three-position four-way solenoid valve 71 and an electro-hydraulic reversing valve 8. The first oil circuit connecting the balance valve group includes a first balance valve group 2, and the first balance valve group 2 is connected with a first high-pressure ball valve 4, a second high-pressure ball valve 41, a third high-pressure ball valve 42 and a fourth high-pressure ball valve 43. The first high-pressure ball valve 4 and the second high-pressure ball valve 41 are connected with a first three-position four-way solenoid valve 7. The third high-pressure ball valve 42 and the fourth high-pressure ball valve 43 are connected with the stacked double one-way throttle valve 5 and the stacked one-way throttle valve 6. The second oil circuit connecting the balance valve group includes a second balance valve group 21, and the second balance valve group 21 is connected with a fifth high-pressure ball valve 44, a sixth high-pressure ball valve 45, a seventh high-pressure ball valve 46 and an eighth high-pressure ball valve 47. The seventh high-pressure ball valve 46 and the eighth high-pressure ball valve 47 are connected with a third three-position four-way solenoid valve 72. The fifth high-pressure ball valve 44 and the sixth high-pressure ball valve 45 are connected with the stacked double one-way throttle valve 5 and the stacked one-way throttle valve 6.

[0011] Specific implementation: A pair of oil cylinders 1 are equipped with a first balancing valve group 2 and a second balancing valve group 21, and the first balancing valve group 2 and the second balancing valve group 21 include a safety valve, a throttle valve, and a one-way valve. The first balancing valve group 2 and the second balancing valve group 21 also include a large chamber oil port B, a small chamber oil port A, a large chamber direct oil return port T when no-load retraction, and an overflow oil return port T1 when the safety valve set pressure is reached. A pair of plunger pumps 11 and a pair of motors 12 are combined to supply oil, and the first three-position four-way solenoid valve 7 or the electro-hydraulic reversing valve 8 is energized to achieve the lifting and lowering of the oil cylinder. The first three-position four-way solenoid valve 7 and the electro-hydraulic reversing valve 8 are energized at the same time for rapid lifting and lowering, and the first three-position four-way solenoid valve 7 alone is energized for slow lifting and lowering. The lifting and lowering speeds required by the working conditions are adjusted by the superimposed double one-way throttle valve 5 and the superimposed one-way throttle valve 6. The first three-position four-way solenoid valve 7 and the third three-position four-way solenoid valve 72 can realize the action of any oil cylinder to achieve the result of forced adjustment of the synchronization of the two oil cylinders. The premise is that when the two cylinders are linked, the third high-pressure ball valve 42, the fourth high-pressure ball valve 43, the fifth high-pressure ball valve 44, and the sixth high-pressure ball valve 45 are opened, and the first high-pressure ball valve 4, the second high-pressure ball valve 41, the seventh high-pressure ball valve 46, and the eighth high-pressure ball valve 47 are closed. When the single lever is moved, the first high-pressure ball valve 4, the second high-pressure ball valve 41, the seventh high-pressure ball valve 46, and the eighth high-pressure ball valve 47 are closed and opened, and the third high-pressure ball valve 42, the fourth high-pressure ball valve 43, the fifth high-pressure ball valve 44, and the sixth high-pressure ball valve 45 are closed. When the cylinder is quickly closed without load, a pair of two-position two-way solenoid valves 3, the second three-position four-way solenoid valve 71, and the electro-hydraulic reversing valve 8 are energized at the same time to achieve the effect of fast reset.

[0012] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0013] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0014] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that a process, article or apparatus / device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent in these processes, articles or apparatus / devices.

[0015] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. A tower crane lifting hydraulic system capable of achieving slow lifting and fast resetting, comprising a hydraulic system, characterized in that: The hydraulic system comprises a pair of oil cylinders (1), a balancing valve group connecting oil circuit, a pressure gauge (9), a pair of one-way valves (10), a pair of plunger pumps (11), a pair of motors (12), a multi-stage electro-hydraulic pilot overflow valve (13) and an oil tank (14) connected to each other; a pair of two-way, two-position solenoid valves (3) are connected between the pair of oil cylinders (1) and the oil tank (14); the balancing valve group connecting oil circuit comprises a first balancing valve group connecting oil circuit and a second balancing valve group connecting oil circuit; the first balancing valve group connecting oil circuit and the second balancing valve group connecting oil circuit are commonly connected to a superimposed double one-way throttle valve (5), a superimposed one-way throttle valve (6), a second three-position, four-way solenoid valve (71) and an electro-hydraulic reversing valve (8).

2. A tower crane lifting hydraulic system capable of achieving slow lifting and fast resetting according to claim 1, characterized in that: The first balancing valve group connecting oil circuit comprises a first balancing valve group (2), the first balancing valve group (2) is connected to a first high-pressure ball valve (4), a second high-pressure ball valve (41), a third high-pressure ball valve (42), and a fourth high-pressure ball valve (43), the first high-pressure ball valve (4) and the second high-pressure ball valve (41) are connected to a first three-position four-way solenoid valve (7), the third high-pressure ball valve (42) and the fourth high-pressure ball valve (43) are connected to a stacked double one-way throttle valve (5) and a stacked one-way throttle valve (6).

3. The tower crane lifting hydraulic system capable of achieving slow lifting and fast resetting according to claim 1, characterized in that: The second balancing valve group connecting oil circuit comprises a second balancing valve group (21), the second balancing valve group (21) is connected to a fifth high-pressure ball valve (44), a sixth high-pressure ball valve (45), a seventh high-pressure ball valve (46), and an eighth high-pressure ball valve (47), the seventh high-pressure ball valve (46) and the eighth high-pressure ball valve (47) are connected to a third three-position four-way solenoid valve (72), and the fifth high-pressure ball valve (44) and the sixth high-pressure ball valve (45) are connected to the stacked double one-way throttle valve (5) and the stacked one-way throttle valve (6).

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