Winch hydraulic system safety device and crane
A technology of hydraulic system and safety device, which is applied in the direction of hoisting device and clockwork mechanism, etc.
Inactive Publication Date: 2012-10-10
ZHEJIANG SANY EQUIP
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Problems solved by technology
[0003]Before the present invention, the inventor found that the prior art had at least the following problems: During the application of the balance valve brake, the leakage of the motor would gradually increase, The demand for instantaneous oil replenishment flow of the system will also increase, and it is very easy to cause the failure of hoist motor suction and stall due to insufficient oil replenishment, which is extremely harmful. Therefore, a reliable oil replenishment device should be installed in the open system of the hoist motor. to improve system security
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[0024] The embodiments of the present invention will be specifically explained below in conjunction with the accompanying drawings.
[0025] Such as figure 1 A winch hydraulic system safety device according to an embodiment of the present invention shown in , wherein the hydraulic system includes a motor 1 , a gear pump 3 and a balance valve 2 . The balance valve 2 is provided at the rising port 12 of the motor 1 . The motor 1 includes a braking port 11 , an ascending port 12 and a descending port 13 .
[0026] The safety device includes a first reversing valve 4 and a second reversing valve 5 .
[0027] Such as figure 2 As shown in , the first reversing valve 4 includes a first pressure oil port P, a first opening B, a first closing port A and a first spool 41 . The second reversing valve 5 includes a second pressure oil port P1 , a second opening B1 , a second closing port A1 and a second valve core 51 . another example figure 1 As shown in , the first pressure oil ...
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The embodiment of the invention provides a winch hydraulic system safety device and a crane, and belongs to the technical field of engineering mechanical manufacturing. The winch hydraulic system safety device comprises a gear pump (3), a first reversing valve (4) and a second reversing valve (5), wherein the first reversing valve (4) comprises a first pressure oil port P, a first opening B, a first closed port A and a first valve core (41); the second reversing valve (5) comprises a second pressure oil port P1, a second opening B1, a second closed port A1 and a second valve core (51); the first pressure oil port P and the second pressure oil port P1 are communicated with the gear pump (3); the first opening B is communicated with a lifting port (11); the second closed port A1 is connected with the first valve core (41) of the first reversing valve (4); and the second closed port A1 is communicated with the brake port (11) of a motor (1). According to the embodiment of the invention, through the pilot control of the reversing valves, the sequential control of oil compensation and braking is realized, the match control of braking and oil compensation is realized, the opening impact is lowered, and the oil compensation demand is reduced.
Description
technical field [0001] The invention belongs to the field of machinery manufacturing, and relates to a safety device, in particular to a hoisting hydraulic system safety device and a crane. Background technique [0002] In the field of engineering lifting, the safety of the hoist is a problem that the whole industry attaches great importance to. At present, the hoisting hydraulic system of large-tonnage crawler cranes adopting an open hydraulic system installs a balance valve at the rising port of the motor to solve the problem of a stable load drop and play a role in stopping the brake. [0003] Before the present invention, the inventor found that the prior art had at least the following problems: during the application of the balance valve brake, the leakage of the motor would gradually increase, and the demand for the instantaneous replenishment flow of the system would also increase, which was very easy to occur The hoist motor cavitation stall fault caused by insuffi...
Claims
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IPC IPC(8): B66D1/08B66D1/54
Inventor 刘士杰王静汪云峰
Owner ZHEJIANG SANY EQUIP