CN203602273U - Hydraulic control system for controlling lifting of amplitude-variable mast of crane and crane - Google Patents

Hydraulic control system for controlling lifting of amplitude-variable mast of crane and crane Download PDF

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Publication number
CN203602273U
CN203602273U CN201320620084.XU CN201320620084U CN203602273U CN 203602273 U CN203602273 U CN 203602273U CN 201320620084 U CN201320620084 U CN 201320620084U CN 203602273 U CN203602273 U CN 203602273U
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CN
China
Prior art keywords
described
mast
valve
hydraulic
jacking cylinder
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CN201320620084.XU
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Chinese (zh)
Inventor
李葳
高一平
黎伟福
宋春阳
袁知华
刘娟容
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中联重科股份有限公司
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Priority to CN201320620084.XU priority Critical patent/CN203602273U/en
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Publication of CN203602273U publication Critical patent/CN203602273U/en

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Abstract

The utility model discloses a hydraulic control system for controlling the lifting of an amplitude-variable mast of a crane. The hydraulic control system comprises a motor, an oil pump, an oil tank, a reversing valve, two hydraulic valves and two mast jacking oil cylinders, wherein the oil pump is connected with the oil tank; the motor is connected with the oil pump; the reversing valve is connected to a hydraulic pipeline at the outlet end of the oil pump; the hydraulic valves are connected to hydraulic pipelines between the mast jacking oil cylinders and the reversing valve; the two hydraulic valves are respectively connected with the two mast jacking oil cylinders; overflow valves are arranged in the hydraulic valves; inlets of the overflow valves are connected with rod-free cavities of the mast jacking oil cylinder; outlets of the overflow valves are connected with the oil tank; and the rod-free cavities of the two mast jacking oil cylinders are connected through a connection pipeline. The hydraulic control system disclosed by the utility model can reliably prevent bending of the amplitude-variable mast during lifting of the amplitude-variable mast.

Description

Control hydraulic control system and the hoisting crane of the lifting of crane amplitude variation mast

Technical field

The utility model relates to hoisting crane technical field, particularly about a kind of hydraulic control system of controlling the lifting of crane amplitude variation mast.

Background technology

At present crawler crane only installs amplitude mast and when crane arm is not installed, the action of amplitude mast relies on luffing elevator and mast jacking cylinder to realize.Luffing elevator is put rope, and mast jacking cylinder stretches out simultaneously, and amplitude mast is realized the action that hoists under the effect of mast jacking cylinder; Luffing elevator rope closing, mast jacking cylinder provides certain back pressure simultaneously, and amplitude mast is realized down maneuver.

Current Domestic crane mast jacking cylinder is installed on amplitude mast bottom, and effect is that power is provided in the time that amplitude mast hoists, and in the time that amplitude mast declines, provides back pressure, prevents amplitude mast decline hypervelocity.In the time that mast jacking cylinder adopts single-acting cylinder, oil cylinder only has an oil circuit, and balance cock needs two oil circuits, therefore on oil cylinder, cannot select balance cock to prevent amplitude mast decline hypervelocity.Therefore when amplitude mast declines, on mast jacking cylinder, the general by pass valve that adopts provides back pressure, prevents amplitude mast decline hypervelocity.

When by pass valve pressure debugging improper, or when by pass valve hair fastener, can be by the bending of mast jacking cylinder under too high back pressure when amplitude mast declines.

Utility model content

In view of this, embodiment of the present utility model provides a kind of hydraulic control system of controlling the lifting of crane amplitude variation mast, can in the time of amplitude mast lifting, prevent reliably amplitude mast bending.

Embodiment of the present utility model provides a kind of hydraulic control system of controlling the lifting of crane amplitude variation mast, comprise motor, oil pump, fuel tank, change-over valve, hydraulic valve, and mast jacking cylinder, described oil pump is connected with described fuel tank, described motor is connected with described oil pump, described change-over valve is connected on the hydraulic tubing of exit end of described oil pump, described hydraulic valve is connected on the hydraulic tubing between described mast jacking cylinder and described change-over valve, the quantity of described mast jacking cylinder and hydraulic valve includes two, two described hydraulic valves are connected with two described mast jacking cylinders respectively, in each described hydraulic valve, be provided with by pass valve, the entrance of described by pass valve is connected with the rodless cavity of described mast jacking cylinder, the outlet of described by pass valve is connected with described fuel tank, between the rodless cavity of two described mast jacking cylinders, connect by a connecting line.

Further, a pressure sensor is also installed on described connecting line, described pressure sensor is for detection of the oil pressure in described connecting line and in the time that oil pressure exceedes preset value, send control signal.

Further, described pressure sensor is oil pressure sensor or pressure relay.

Further, in described hydraulic valve, be also provided with balance cock, the entrance of described balance cock is connected with the rodless cavity of described mast jacking cylinder, the outlet of described balance cock is connected with a wherein working oil path of described change-over valve, and another working oil path of described change-over valve is connected with a control mouthful of described balance cock.

Further, be also provided with check valve in described hydraulic valve, described check valve and described balance cock are arranged in parallel, and the two ends of described check valve are connected with the entrance and exit of described balance cock respectively.

Further, described change-over valve is a 3-position 4-way solenoid directional control valve.

Further, described change-over valve is in the time of the first control position, and the pressure oil of described oil pump arrives described hydraulic valve through described change-over valve, and through the check valve in described hydraulic valve, arrive the rodless cavity of described mast jacking cylinder, promote described mast jacking cylinder and stretch out.

Further, described change-over valve is in the time of meta, and under the effect of described luffing elevator rope closing, described amplitude mast declines, promote described mast jacking cylinder retraction, the fluid of the rodless cavity of described mast jacking cylinder returns to described fuel tank through the by pass valve in described hydraulic valve.

Further, described change-over valve is in the time of the second control position, the pressure oil of described oil pump arrives described hydraulic valve through described change-over valve, then reach the control mouth of described balance cock and open described balance cock, the fluid of the rodless cavity of described mast jacking cylinder returns to described fuel tank through balance cock and described change-over valve in described hydraulic valve.

Embodiment of the present utility model also provides a kind of hoisting crane, comprise main platform, amplitude mast, mast jacking cylinder, luffing elevator, variable-amplitude steel wire rope and luffing pulley, described hoisting crane has adopted the hydraulic control system of above-mentioned control crane amplitude variation mast lifting, and utilizes described hydraulic control system to control the lifting of described amplitude mast.

The beneficial effect that the technical scheme that embodiment of the present utility model provides is brought is: the hydraulic control system of the control crane amplitude variation mast lifting that above-described embodiment provides, by a connecting line is set between the rodless cavity at two mast jacking cylinders, in the time that amplitude mast declines, if the by pass valve pressure debugging in one of them hydraulic valve is improper or when hair fastener, the fluid of the rodless cavity of mast jacking cylinder can be by the by pass valve oil sump tank in another hydraulic valve, back pressure is still maintained normally, and therefore probability failure reduces by 50%; Secondly, by setting pressure sensor on this connecting line, in the time that amplitude mast declines, if the equal pressure debugging of by pass valve in two hydraulic valves is improper or when hair fastener, the pressure signal control amplitude mast that can be provided by this pressure sensor stops down maneuver, until get rid of the fault of hydraulic valve, and after the pressure providing at by pass valve recovers normally, just continue to do the down maneuver of amplitude mast, thereby it is bending to prevent reliably amplitude mast to occur.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in embodiment of the present utility model, below the accompanying drawing of required use during embodiment is described is briefly described.

Fig. 1 is the part-structure schematic diagram of the hoisting crane with amplitude mast of the utility model embodiment proposition;

Fig. 2 is the composition schematic diagram of the hydraulic control system of the amplitude mast lifting of the control hoisting crane of the utility model embodiment proposition.

The specific embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model embodiment is further described.

Fig. 1 is the part-structure schematic diagram of the hoisting crane with amplitude mast of the utility model embodiment proposition, please refer to the drawing 1, this hoisting crane comprises main platform 11, crane arm (not shown), amplitude mast 12, mast jacking cylinder 13, luffing elevator 14, variable-amplitude steel wire rope 15 and luffing pulley 16.Particularly, this hoisting crane is a crawler crane.

One end (bottom) of amplitude mast 12 is hingedly mounted on main platform 11.One end (bottom) of mast jacking cylinder 13 is hingedly mounted on main platform 11, the other end (top) of mast jacking cylinder 13 is hingedly mounted on amplitude mast 12, in the present embodiment, the cylinder end of mast jacking cylinder 13 is hingedly mounted on main platform 11, and the rod end of mast jacking cylinder 13 is hingedly mounted on amplitude mast 12.Luffing elevator 14 is arranged on main platform 11.Luffing pulley 16 comprises the first pulley 161 and the second pulley 162, and wherein, the first pulley 161 is fixedly mounted on the other end (top) of amplitude mast 12, and the second pulley 162 is fixedly mounted on main platform 11.One end of variable-amplitude steel wire rope 15 is connected with luffing elevator 14, and variable-amplitude steel wire rope 15 is being walked around after the first pulley 161 and the second pulley 162, and the other end and main platform 11 are fixing.One end (bottom) of crane arm is hingedly mounted on main platform 11, between the other end (top) of crane arm and the top of amplitude mast 12, is connected with stay cord (not shown).Like this, by luffing elevator 14, the folding and unfolding of variable-amplitude steel wire rope 15 is changed the length of variable-amplitude steel wire rope 15, amplitude mast 12 is rotated around the hinge-point of itself and main platform 11, because amplitude mast 12 is fixedly connected with the top of crane arm by stay cord, the rotation of amplitude mast 12 can correspondingly drive crane arm also to rotate around the hinge-point of itself and main platform 11, thereby reaches the object of the angle of adjusting crane arm.

When this hoisting crane is not installed crane arm only installing amplitude mast 12, the action of amplitude mast 12 relies on luffing elevator 14 and mast jacking cylinder 13 to realize.Luffing elevator 14 is put rope, and mast jacking cylinder 13 stretches out simultaneously, and amplitude mast 12 is realized the action that hoists under the effect of mast jacking cylinder 13; Luffing elevator 14 rope closings, mast jacking cylinder 13 provides certain back pressure simultaneously, and amplitude mast 12 is realized down maneuver.

Fig. 2 is the composition schematic diagram of the hydraulic control system of the amplitude mast lifting of the control hoisting crane of the utility model embodiment proposition, the hoisting crane of Fig. 1 has adopted the hydraulic control system of Fig. 2, and utilizes this hydraulic control system to control the lifting of amplitude mast 12.Please refer to the drawing 2, this hydraulic control system comprises motor 21, oil pump 22, fuel tank 23, change-over valve 24, hydraulic valve 25 and mast jacking cylinder 13.Oil pump 22 is connected with fuel tank 23, and motor 21 is connected with oil pump 22, and change-over valve 24 is connected on the hydraulic tubing of exit end of oil pump 22, and hydraulic valve 25 is connected on the hydraulic tubing between mast jacking cylinder 13 and change-over valve 24.In the present embodiment, the quantity of mast jacking cylinder 13 and hydraulic valve 25 includes two, is respectively the first mast jacking cylinder 13a and the second mast jacking cylinder 13b, and the first hydraulic valve 25a and the second hydraulic valve 25b; Two mast jacking cylinder 13a, 13b are arranged on the left and right sides of amplitude mast 12, and two hydraulic valve 25a, 25b are connected with two mast jacking cylinder 13a, 13b respectively.

More specifically, change-over valve 24 is a 3-position 4-way solenoid directional control valve 24, is connected between the outlet and hydraulic valve 25 of oil pump 22, for controlling the action of mast jacking cylinder 13.The Median Function of change-over valve 24 is Y shape, i.e. meta off-load.Hydraulic valve 25 is integrated valve bodies, interior integrated balance cock 251, by pass valve 252 and the check valve 253 of being provided with of each hydraulic valve 25; Wherein, the entrance of the entrance of balance cock 251 and by pass valve 252 is all connected with the rodless cavity of mast jacking cylinder 13, the outlet of balance cock 251 is connected with a wherein working oil path a1 of change-over valve 24, another working oil path a2 of change-over valve 24 is connected with a control mouthful of balance cock 251, the outlet of by pass valve 252 is connected with fuel tank 23, check valve 253 is arranged in parallel with balance cock 251, and the two ends of check valve 253 are connected with the entrance and exit of balance cock 251 respectively.

In the time that motor 21 moves, oil pump 22 is worked and hydraulic oil is pressed into hydraulic tubing from fuel tank 23.When change-over valve 24 is when the first control position (in figure be right position), the pressure oil of oil pump 22 is through change-over valve 24, arrive the F mouth of hydraulic valve 25 from working oil path a1, through the check valve 253 in hydraulic valve 25, arrive the rodless cavity of mast jacking cylinder 13, promote mast jacking cylinder 13 and stretch out, thereby amplitude mast 12 is realized the action that hoists under the effect of mast jacking cylinder 13.

When change-over valve 24 is during in meta, under the effect of luffing elevator 14 rope closings, amplitude mast 12 declines, promoting mast jacking cylinder 13 bounces back, the fluid of the rodless cavity of mast jacking cylinder 13 is greater than the response pressure of by pass valve 252 through the response pressure of the by pass valve 252 oil sump tank 23(balance cocks 251 in hydraulic valve 25, now balance cock 251 is in closing), thereby the rodless cavity at mast jacking cylinder 13 produces back pressure, the size of back pressure is set by the response pressure size of by pass valve 252, thereby the gravity of balance amplitude mast 12, avoid amplitude mast 12 hypervelocities to decline.

In the utility model, between the rodless cavity of two the mast jacking cylinders 13 in left and right, also connect by a connecting line 26, in amplitude mast 12 decline processes, if by pass valve 252 pressure debuggings in the first hydraulic valve 25a are improper or when by pass valve 252 hair fastener, the fluid of the rodless cavity of the first mast jacking cylinder 13a can be by by pass valve 252 oil sump tanks 23 in the second hydraulic valve 25b; If by pass valve 252 pressure debuggings in the second hydraulic valve 25b are improper or when by pass valve 252 hair fastener, the fluid of the rodless cavity of the second mast jacking cylinder 13b can be by by pass valve 252 oil sump tanks 23 in the first hydraulic valve 25a.In above-mentioned two situations, back pressure still maintains normally, and therefore probability failure reduces by 50%.

Further, a pressure sensor 27 is also installed on this connecting line 26, pressure sensor 27 is for detection of the oil pressure in connecting line 26 and in the time that oil pressure exceedes preset value, send control signal.For example, this pressure sensor 27 is oil pressure sensor, the oil pressure in connecting line 26 can be transformed into electric signal, and pass to control system using this as control signal.In amplitude mast 12 decline processes, if the equal pressure debugging of the by pass valve in two hydraulic valves 25 252 is improper or when by pass valve 252 hair fastener, once the pressure in connecting line 26 exceedes normal pressure, pressure sensor 27 is passed pressure signal back to control system, and can be by the programming control of setting, automatically stop the down maneuver of amplitude mast 12, when getting rid of the fault of hydraulic valve 25, make pressure that by pass valve 252 provides recover normal after, just continue to do the down maneuver of amplitude mast 12, thereby it is bending to prevent reliably amplitude mast 12 to occur.

In other embodiments, this pressure sensor 27 can also be a pressure relay, electric elements that this pressure relay is also controlled 14 retractable rope actions of luffing elevator with one (as motor etc.) be connected, this pressure relay utilizes the oil pressure in connecting line 26 to open and close this electric elements, in the time that the pressure in connecting line 26 reaches the setting of this pressure relay, this pressure relay sends electric signal, make this electric elements action, and make luffing elevator 14 stop rope closing, thereby stop the down maneuver of amplitude mast 12.

In the time that mast jacking cylinder 13 does not need to provide back pressure, for example install after crane arm, in the time utilizing luffing elevator 14 and amplitude mast 12 to carry out luffing to crane arm, now change-over valve 24 is switched in the second control position (being left position in figure), the pressure oil of oil pump 22 is through change-over valve 24, arrive the S mouth of hydraulic valve 25 from working oil path b1, then reach the control mouth of balance cock 251 and open balance cock 251, the fluid of the rodless cavity of mast jacking cylinder 13 is through the balance cock 251 in hydraulic valve 25, from the working oil path a1 oil sump tank 23 of change-over valve 24, in the oil circuit of oil return, do not provide back pressure, therefore can accelerate the retraction speed of mast jacking cylinder 13.

Comprehensively above-mentioned, the hydraulic control system of the amplitude mast lifting of the control hoisting crane that the utility model embodiment provides, by a connecting line is set between the rodless cavity at two mast jacking cylinders, in the time that amplitude mast declines, if the by pass valve pressure debugging in one of them hydraulic valve is improper or when hair fastener, the fluid of the rodless cavity of mast jacking cylinder can, by the by pass valve oil sump tank in another hydraulic valve, still maintain normally back pressure, and therefore probability failure reduces by 50%; Secondly, by setting pressure sensor on this connecting line, in the time that amplitude mast declines, if the equal pressure debugging of by pass valve in two hydraulic valves is improper or when hair fastener, the pressure signal control amplitude mast that can be provided by this pressure sensor stops down maneuver, until get rid of the fault of hydraulic valve, and after the pressure providing at by pass valve recovers normally, just continue to do the down maneuver of amplitude mast, thereby it is bending to prevent reliably amplitude mast to occur.

It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (10)

1. control the hydraulic control system of crane amplitude variation mast lifting for one kind, comprise motor (21), oil pump (22), fuel tank (23), change-over valve (24), hydraulic valve (25), and mast jacking cylinder (13), described oil pump (22) is connected with described fuel tank (23), described motor (21) is connected with described oil pump (22), described change-over valve (24) is connected on the hydraulic tubing of exit end of described oil pump (22), described hydraulic valve (25) is connected on the hydraulic tubing between described mast jacking cylinder (13) and described change-over valve (24), it is characterized in that: the quantity of described mast jacking cylinder (13) and hydraulic valve (25) includes two, two described hydraulic valve (25a, 25b) respectively with two described mast jacking cylinder (13a, 13b) be connected, in each described hydraulic valve (25), be provided with by pass valve (252), the entrance of described by pass valve (252) is connected with the rodless cavity of described mast jacking cylinder (13), the outlet of described by pass valve (252) is connected with described fuel tank (23), two described mast jacking cylinder (13a, between rodless cavity 13b), connect by a connecting line (26).
2. the hydraulic control system of control crane amplitude variation mast as claimed in claim 1 lifting, it is characterized in that: a pressure sensor (27) is also installed on described connecting line (26), and described pressure sensor (27) is for detection of the oil pressure in described connecting line (26) and in the time that oil pressure exceedes preset value, send control signal.
3. the hydraulic control system of control crane amplitude variation mast as claimed in claim 2 lifting, is characterized in that: described pressure sensor (27) is oil pressure sensor or pressure relay.
4. the hydraulic control system of control crane amplitude variation mast as claimed in claim 1 lifting, it is characterized in that: in described hydraulic valve (25), be also provided with balance cock (251), the entrance of described balance cock (251) is connected with the rodless cavity of described mast jacking cylinder (13), the outlet of described balance cock (251) is connected with a wherein working oil path (a1) of described change-over valve (24), and another working oil path (a2) of described change-over valve (24) is connected with a control mouthful of described balance cock (251).
5. the hydraulic control system of control crane amplitude variation mast as claimed in claim 4 lifting, it is characterized in that: in described hydraulic valve (25), be also provided with check valve (253), described check valve (253) is arranged in parallel with described balance cock (251), and the two ends of described check valve (253) are connected with the entrance and exit of described balance cock (251) respectively.
6. the hydraulic control system of control crane amplitude variation mast as claimed in claim 5 lifting, is characterized in that: described change-over valve (24) is a 3-position 4-way solenoid directional control valve.
7. the hydraulic control system of control crane amplitude variation mast as claimed in claim 6 lifting, it is characterized in that: described change-over valve (24) is in the time of the first control position, the pressure oil of described oil pump (22) arrives described hydraulic valve (25) through described change-over valve (24), and through the check valve (253) in described hydraulic valve (25), arrive the rodless cavity of described mast jacking cylinder (13), promote described mast jacking cylinder (13) and stretch out.
8. the hydraulic control system of control crane amplitude variation mast as claimed in claim 6 lifting, it is characterized in that: described change-over valve (24) is in the time of meta, under the effect of luffing elevator (14) rope closing, amplitude mast (12) declines, promote described mast jacking cylinder (13) retraction, the fluid of the rodless cavity of described mast jacking cylinder (13) returns to described fuel tank (23) through the by pass valve (252) in described hydraulic valve (25).
9. the hydraulic control system of control crane amplitude variation mast as claimed in claim 6 lifting, it is characterized in that: described change-over valve (24) is in the time of the second control position, the pressure oil of described oil pump (22) arrives described hydraulic valve (25) through described change-over valve (24), then reach the control mouth of described balance cock (251) and open described balance cock (251), the fluid of the rodless cavity of described mast jacking cylinder (13) returns to described fuel tank (23) through balance cock (251) and described change-over valve (24) in described hydraulic valve (25).
10. a hoisting crane, comprise main platform (11), amplitude mast (12), mast jacking cylinder (13), luffing elevator (14), variable-amplitude steel wire rope (15) and luffing pulley (16), it is characterized in that: described hoisting crane has adopted the hydraulic control system of the control crane amplitude variation mast lifting as described in claim 1 to 9 any one, and utilizes described hydraulic control system to control the lifting of described amplitude mast (12).
CN201320620084.XU 2013-10-09 2013-10-09 Hydraulic control system for controlling lifting of amplitude-variable mast of crane and crane CN203602273U (en)

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Application Number Priority Date Filing Date Title
CN201320620084.XU CN203602273U (en) 2013-10-09 2013-10-09 Hydraulic control system for controlling lifting of amplitude-variable mast of crane and crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320620084.XU CN203602273U (en) 2013-10-09 2013-10-09 Hydraulic control system for controlling lifting of amplitude-variable mast of crane and crane

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105060137A (en) * 2015-08-03 2015-11-18 河南省三马起重机械有限公司 No-explosionproof valve lifting system of crawler crane
CN105090143A (en) * 2015-07-22 2015-11-25 南京梅山冶金发展有限公司 Control system and control method for pitch oil cylinder of stacker-reclaimer
CN106704313A (en) * 2016-12-16 2017-05-24 上海中联重科桩工机械有限公司 Rotary drilling rig, mast hydraulic control system and mast lifting up/ down control method
CN106698199A (en) * 2017-01-23 2017-05-24 武汉船用机械有限责任公司 Double-derricking cylinder hydraulic control system
CN110005648A (en) * 2019-04-08 2019-07-12 浙江大学 A kind of pressure stabilizing hydraulic circuit based on marine tidal-current energy generator group

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105090143A (en) * 2015-07-22 2015-11-25 南京梅山冶金发展有限公司 Control system and control method for pitch oil cylinder of stacker-reclaimer
CN105060137A (en) * 2015-08-03 2015-11-18 河南省三马起重机械有限公司 No-explosionproof valve lifting system of crawler crane
CN106704313A (en) * 2016-12-16 2017-05-24 上海中联重科桩工机械有限公司 Rotary drilling rig, mast hydraulic control system and mast lifting up/ down control method
CN106698199A (en) * 2017-01-23 2017-05-24 武汉船用机械有限责任公司 Double-derricking cylinder hydraulic control system
CN106698199B (en) * 2017-01-23 2018-08-07 武汉船用机械有限责任公司 A kind of double amplitude oil cylinder hydraulic control systems
CN110005648A (en) * 2019-04-08 2019-07-12 浙江大学 A kind of pressure stabilizing hydraulic circuit based on marine tidal-current energy generator group

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