CN210655927U - Automatic hook-retracting and overload-preventing hydraulic system suitable for straight-arm lorry-mounted crane - Google Patents
Automatic hook-retracting and overload-preventing hydraulic system suitable for straight-arm lorry-mounted crane Download PDFInfo
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- CN210655927U CN210655927U CN201921397499.9U CN201921397499U CN210655927U CN 210655927 U CN210655927 U CN 210655927U CN 201921397499 U CN201921397499 U CN 201921397499U CN 210655927 U CN210655927 U CN 210655927U
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- 239000003921 oil Substances 0.000 claims description 103
- 239000010720 hydraulic oil Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000002265 prevention Effects 0.000 abstract description 4
- 230000002079 cooperative effect Effects 0.000 abstract description 3
- 230000001960 triggered effect Effects 0.000 description 4
- 241001669679 Eleotris Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model discloses an automatic hook retracting and overload preventing hydraulic system suitable for a straight-arm lorry-mounted crane, which belongs to the technical field of cranes and comprises a hoisting control unit, a balance valve, a hoisting motor, a hoisting hook assembly, a limit switch, a hoisting device, a hoisting brake, a third overflow valve and an electromagnetic directional valve; the hoist control allies oneself with includes: the first overflow valve, the manual reversing valve and the second overflow valve; the utility model has the functions of overwinding prevention and overload prevention during normal hoisting operation; the automatic hook retracting can be realized only when the hook is empty; the operation step and the cooperative action of other parts are not additionally increased, and the operation comfort level is high.
Description
Technical Field
The utility model relates to a straight arm lorry crane's automation is received and is hooked and overload hydraulic system belongs to straight arm lorry crane hydraulic pressure technical field.
Background
The lorry-mounted crane is a multi-action crane mounted on the automobile for lifting and horizontally carrying heavy objects, and mainly comprises a stable supporting leg, a rotary base, a rotary table, a suspension arm assembly, a lifting hook and the like. The device has the characteristics of rapidness, flexibility, high efficiency, convenience, integration of loading, unloading and transportation and the like, is widely applied to various loading, unloading, installing and hoisting operations, and is particularly suitable for field hoisting and rescue operations and narrow places such as stations, ports, warehouses, construction sites and the like. The crane is divided into a straight-arm type lorry-mounted crane and a folding-arm type lorry-mounted crane according to different structural forms. The straight arm type lorry-mounted crane completes the loading and unloading operation of goods by means of a telescopic boom, a luffing mechanism and a hoisting mechanism (steel wire rope).
The lifting hook is a key component of the lorry-mounted crane, and when the crane runs, the lifting hook must be fixed reliably, and should be prevented from being positioned above a cab so as not to interfere with the view of a driver; when the crane lifts, the lifting hook is loosened to lift. At present crane hook can not receive the hook automatically, will go on with artifical auxiliary mode, generally is through the fixed artifical fixed rope in back of lifting hook, perhaps leans on the manual work to plug into the sleeper in lifting hook and arm head space and fix the lifting hook, and not only consuming time hard, and the security performance is low, easily leads to the incident. The working efficiency, the driving safety and the practicability of the equipment are reduced.
Therefore, how to provide an automatic hook receiving system of a lorry-mounted crane with easy operation, safety and reliability, and improving the efficiency of the lorry-mounted crane is a problem to be solved urgently in the technical field of cranes at present.
Through searching, the prior patents have the following defects:
patent CN206599390U provides an automatic hook retracting mechanism of crane hook, and its characteristics are: be provided with stop gear, wire rope guide pulley mechanism, the lifting hook assembly rises to the horn mouth department that stop gear's first direction bent plate, second direction bent plate enclose, realizes spacing chucking, and the laminating of rethread curb plate and limiting plate bottom surface is accomplished and is received the hook, is applied to the automation of the less hoist of tonnage and receives the hook.
Patent CN205381882U proposes a hook retracting device and a hook retracting system of a crane, which are characterized in that: the tail end of the crane boom is provided with a bayonet, the upper end of the crane hook is provided with a clamping piece, and when the crane hook is lifted to a terminal point, the clamping piece and the bayonet are rotatably clamped by controlling the drawing in and putting down of a steel wire rope, so that automatic hook retraction is realized.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model aims to provide an automatic hook-retracting and overload-preventing hydraulic system suitable for a straight-arm lorry-mounted crane, so that the overwinding-preventing and overload-preventing protection functions are realized during normal hoisting operation; the automatic hook retracting can be realized only when the hook is empty; the operation step and the cooperative action of other parts are not additionally increased, and the operation comfort level is high.
In order to solve the above problem, the utility model adopts the following technical scheme:
an automatic hook retracting and overload preventing hydraulic system suitable for a straight-arm lorry-mounted crane comprises a hoisting control unit, a balance valve, a hoisting motor, a lifting hook assembly, a limit switch, a hoisting device, a hoisting brake, a third overflow valve and an electromagnetic directional valve; the hoist control allies oneself with includes: the first overflow valve, the manual reversing valve and the second overflow valve;
the hydraulic oil source is communicated with the winch control oil connecting port P and supplies oil to the whole hydraulic system; the oil inlet of the manual reversing valve is communicated with an oil port P of the winch control unit, the oil outlet of the manual reversing valve is respectively communicated with oil ports A1 and B1 of the winch control unit, and the first overflow valve and the second overflow valve are respectively connected to oil paths from the two oil outlets of the manual reversing valve to the oil ports A1 and B1 of the winch control unit. Oil return ports of the manual reversing valve, the first overflow valve and the second overflow valve are communicated with a hydraulic oil tank of the hydraulic system; the oil ports A1 and B1 of the winch control unit are respectively communicated with oil ports V1 and C1, V2 and C2 of a balance valve; an oil inlet D of the electromagnetic directional valve is communicated with an oil port C1 of the balance valve 2, an oil outlet of the electromagnetic directional valve is communicated with a third overflow valve, and an oil port C3 of the balance valve is communicated with an oil port P1 of a winch brake; an oil port a on the lifting side of the hoisting motor is communicated with an oil port C1 of the balance valve, an oil port C3 of the balance valve is communicated with an oil port P1 of the hoisting brake 7, an oil port C2 of the balance valve is communicated with an oil port E of a third overflow valve, and an oil port b on the descending side of the hoisting motor is communicated with an oil port E of the third overflow valve; the lifting hook assembly is connected with a hoisting device through a steel wire rope, the hoisting device is driven by a hoisting motor, and the electromagnetic directional valve is controlled by a limit switch.
Furthermore, the set pressure value of the third overflow valve is 5-10 bar greater than the opening pressure value of the hoisting brake,
furthermore, the set pressure value of the second overflow valve corresponds to the rated hoisting capacity of the hoisting motor.
During operation, the load rises and the limit switch is not triggered: the handle of the manual reversing valve 1-2 is operated to be in an upper position. At this time, the electromagnetic directional valve is in a power-off state and works in an upper position, and the oil passages from the D position to the electromagnetic directional valve 9 and the third overflow valve are cut off.
If the overload does not exist, the hoisting pressure of the hoisting motor is smaller than the set pressure of the second overflow valve, and the second overflow valve is in a closed state. At the moment, an oil inlet of the manual reversing valve is communicated with an oil port P of the winch control linkage, oil is supplied by a hydraulic oil source, hydraulic oil passes through an oil port A1 of the winch control linkage and an oil port V1 of the balance valve through the port P and enters an oil port a on the lifting side of the winch motor through an oil port C1 of the balance valve 2, meanwhile, the hydraulic oil enters an oil port P1 of a winch brake 7 through an oil port C3 of the balance valve, the winch brake 7 is opened under the action of hydraulic oil pressure, and mechanical braking is not performed on the winch device 6 any more. An output shaft of the hoisting motor drives the hoisting device to hoist the hook assembly and the heavy object, at the moment, hydraulic oil output by the hoisting motor sequentially passes through an oil outlet E of the third overflow valve, an oil outlet C2 and a V2 of the balance valve 2 to an oil outlet B1 of the hoisting control unit 1 through an oil port B, and finally flows to an oil port T oil return tank of the hoisting control unit through the manual reversing valve, hoisting goods rise, and normal hoisting operation is realized. The load rises, and a limit switch is triggered: the electromagnet of the electromagnetic directional valve is electrified to enable the electromagnetic directional valve to be reversed to the lower position, oil passages of oil ports C1 to D of the balance valve, the electromagnetic directional valve and the third overflow valve are communicated with an oil passage of an oil passage E, at the moment, hydraulic oil passes through a winch control oil connecting port A1 and an oil port V1 of the balance valve through a port P, enters the electromagnetic directional valve through oil ports C1 and D of the balance valve, passes through the electromagnetic directional valve and the third overflow valve to the oil passage E, then sequentially passes through the oil ports C2 and V2 of the balance valve to an oil port B1 of the winch control oil connecting port, and finally returns to an oil tank through a manual directional valve 1. Because the set pressure value of the third overflow valve is 5-10 bar higher than the pressure of the hoisting brake, the hoisting motor continues to work under low pressure, but the pressure is lower, and the hoisting device cannot be driven to hoist cargos, so that the lifting hook and the cargos stop rising, the load limiting function is realized, and the damage caused by overwinding of the hoisting device is avoided. When goods are unloaded and the lifting hook assembly is pulled to ascend in an empty hook state, after the limit switch is triggered, the electromagnet of the electromagnetic reversing valve is electrified to reverse the lifting hook assembly to the lower position, at the moment, the hydraulic oil circuit is the same as that after the limit switch 5 is triggered in the loaded ascending process, the set pressure value of the third overflow valve is 5-10 bar higher than the pressure of the hoisting brake, so that the hoisting brake is started, the hoisting motor continues to work under the low pressure to drive the lifting hook to ascend, and the lifting hook is matched with the hook collecting mechanism until the automatic hook collecting action is completed.
Compared with the prior art, the utility model has the functions of overwinding prevention and overload prevention during normal hoisting operation; the automatic hook retracting can be realized only when the hook is empty; no additional operation steps and the cooperative action of other parts are added, and the operation comfort level is high.
Drawings
Fig. 1 is a hydraulic schematic block diagram of the present invention.
The reference numbers in the figures illustrate:
1: winch control unit, 1-1: first relief valve, 1-2: manual directional control valve, 1-3: a second overflow valve; 2: balance valve, 3: hoisting motor, 4: hook assembly, 5: limit switch, 6: hoisting device, 7: hoisting brake, 8: third relief valve, 9: electromagnetic directional valve, 10: a source of hydraulic oil.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
As shown in fig. 1, an automatic hook retracting hydraulic system of a straight-arm lorry-mounted crane comprises: the device comprises a winch control unit 1, a balance valve 2, a winch motor 3, a lifting hook assembly 4, a limit switch 5, a winch device 6, a winch brake 7, a third overflow valve 8 and an electromagnetic directional valve 9. The hoist control unit 1 includes: the manual reversing valve comprises a first overflow valve 1-1, a manual reversing valve 1-2 and a second overflow valve 1-3.
The hydraulic oil source 10 is communicated with an oil port P of the winch control unit 1 and supplies oil to the whole hydraulic system.
An oil inlet of the manual reversing valve 1-2 is communicated with an oil port P of the winch control unit 1, an oil outlet of the manual reversing valve 1-2 is respectively communicated with oil ports A1 and B1 of the winch control unit 1, and the first overflow valve 1-1 and the second overflow valve 1-3 are respectively connected to oil paths from two oil outlets of the manual reversing valve 1-2 to the oil ports A1 and B1 of the winch control unit 1. Oil return ports of the manual reversing valve 1-2, the first overflow valve 1-1 and the second overflow valve 1-3 are all communicated with a hydraulic oil tank of a hydraulic system.
The oil ports A1 and B1 of the winch control unit 1 are respectively communicated with the oil ports V1 and C1, V2 and C2 of the balance valve 2.
An oil inlet D of the electromagnetic directional valve 9 is communicated with an oil port C1 of the balance valve 2, an oil outlet of the electromagnetic directional valve 1-2 is communicated with a third overflow valve 8, and an oil port C3 of the balance valve 2 is communicated with an oil port P1 of the winch brake 7.
The oil port a on the lifting side of the hoisting motor 3 is communicated with the oil port C1 of the balance valve 2, the oil port C3 of the balance valve 2 is communicated with the oil port P1 of the hoisting brake 7, the oil port C2 of the balance valve 2 is communicated with the oil outlet E of the third overflow valve 8, and the oil port b on the descending side of the hoisting motor 3 is communicated with the oil outlet E of the third overflow valve 8.
The lifting hook assembly 4 is connected with a hoisting device 6 through a steel wire rope, the hoisting device 6 is driven by a hoisting motor 3, and an electromagnetic directional valve 9 is controlled by a limit switch 5.
The set pressure value of the third overflow valve 8 is 5-10 bar larger than the opening pressure value of the hoisting brake 7, and the set pressure value of the second overflow valve 1-3 is determined by the rated hoisting capacity of the hoisting motor 3.
Claims (3)
1. An automatic hook retracting and overload preventing hydraulic system suitable for a straight-arm lorry-mounted crane is characterized by comprising a hoisting control unit (1), a balance valve (2), a hoisting motor (3), a lifting hook assembly (4), a limit switch (5), a hoisting device (6), a hoisting brake (7), a third overflow valve (8), an electromagnetic directional valve (9) and a hydraulic oil source (10); the hoisting control unit (1) comprises: the manual reversing valve comprises a first overflow valve (1-1), a manual reversing valve (1-2) and a second overflow valve (1-3);
the hydraulic oil source (10) is communicated with an oil port P of the winch control unit (1) and supplies oil to the whole hydraulic system; an oil inlet of the manual reversing valve (1-2) is communicated with an oil port P of the winch control unit (1), an oil outlet of the manual reversing valve (1-2) is respectively communicated with oil ports A1 and B1 of the winch control unit (1), and a first overflow valve (1-1) and a second overflow valve (1-3) are respectively connected to oil paths from two oil outlets of the manual reversing valve (1-2) to the oil ports A1 and B1 of the winch control unit (1); oil return ports of the manual reversing valve (1-2), the first overflow valve (1-1) and the second overflow valve (1-3) are communicated with a hydraulic oil tank of the hydraulic system; oil ports A1 and B1 of the winch control unit (1) are respectively communicated with oil ports V1 and C1, V2 and C2 of the balance valve (2); an oil inlet D of the electromagnetic directional valve (9) is communicated with an oil port C1 of the balance valve (2), an oil outlet of the electromagnetic directional valve (9) is communicated with a third overflow valve (8), and an oil port C3 of the balance valve (2) is communicated with an oil port P1 of the winch brake (7); an oil port a on the lifting side of the hoisting motor (3) is communicated with an oil port C1 of the balance valve (2), an oil port C3 of the balance valve (2) is communicated with an oil port P1 of the hoisting brake (7), an oil port C2 of the balance valve (2) is communicated with an oil outlet E of a third overflow valve (8), and an oil port b on the descending side of the hoisting motor (3) is communicated with an oil outlet E of the third overflow valve (8); the lifting hook assembly (4) is connected with the hoisting device (6) through a steel wire rope, the hoisting device (6) is driven by the hoisting motor (3), and the electromagnetic directional valve (9) is controlled by the limit switch (5).
2. The automatic hook retracting and overload preventing hydraulic system for the straight-arm lorry-mounted crane according to claim 1, characterized in that: the set pressure value of the third overflow valve (8) is 5-10 bar greater than the opening pressure value of the winch brake (7).
3. The automatic hook retracting and overload preventing hydraulic system for the straight-arm lorry-mounted crane according to claim 1, characterized in that: the set pressure value of the second overflow valve (1-3) corresponds to the rated hoisting capacity of the hoisting motor (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921397499.9U CN210655927U (en) | 2019-08-27 | 2019-08-27 | Automatic hook-retracting and overload-preventing hydraulic system suitable for straight-arm lorry-mounted crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921397499.9U CN210655927U (en) | 2019-08-27 | 2019-08-27 | Automatic hook-retracting and overload-preventing hydraulic system suitable for straight-arm lorry-mounted crane |
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| CN210655927U true CN210655927U (en) | 2020-06-02 |
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| CN201921397499.9U Active CN210655927U (en) | 2019-08-27 | 2019-08-27 | Automatic hook-retracting and overload-preventing hydraulic system suitable for straight-arm lorry-mounted crane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110407117A (en) * | 2019-08-27 | 2019-11-05 | 徐州徐工随车起重机有限公司 | A kind of automatic receipts hook and antioverloading hydraulic system suitable for straight-arm lorry-mounted crane |
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2019
- 2019-08-27 CN CN201921397499.9U patent/CN210655927U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110407117A (en) * | 2019-08-27 | 2019-11-05 | 徐州徐工随车起重机有限公司 | A kind of automatic receipts hook and antioverloading hydraulic system suitable for straight-arm lorry-mounted crane |
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