CN101537984B - Hoist motor closed type hydraulic system for preventing pipelines from bursting and control method thereof - Google Patents
Hoist motor closed type hydraulic system for preventing pipelines from bursting and control method thereof Download PDFInfo
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- CN101537984B CN101537984B CN2009100497263A CN200910049726A CN101537984B CN 101537984 B CN101537984 B CN 101537984B CN 2009100497263 A CN2009100497263 A CN 2009100497263A CN 200910049726 A CN200910049726 A CN 200910049726A CN 101537984 B CN101537984 B CN 101537984B
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Abstract
The invention provides a hoist motor closed type hydraulic system for preventing pipelines from bursting, comprising a hoist motor, a rising oilway and a descending oilway thereof, and a closed type pump serially arranged in the oilways thereof; a brake and a braking electromagnetic valve are connected; the oilways of the hoist motor is connected with the oil supplementing oilways and oil supplementing pumps, oil sump tank and oil sump oilways of the braking electromagnetic valve; a pipeline bursting prevention device comprises a two-way cartridge inserted valve and a reversing valve; the two-way cartridge inserted valve is arranged in the oilway between the hoist motor and the closed type pump, the two ports: B-port and A-port are respectively corresponding to the oilway between the hoist motor and the closed type pump; the reversing valve is respectively connected with B-port and C-port by the pipelines, G-port of the reversing valve is connected with the descending oilway of the hoist motor, and T-port is connected with the oil sump tank. In the invention, the starting of the hydraulic control reversing valve is controlled by the pressure of the closed type system oil supplementing oilways, and a security overflow valve is arranged in the oil sump oilways for preventing the pressure of the rising port of the hoist motor from being too high to protect the hoist motor.
Description
Technical field
The present invention relates to the safety system of hydraulic lift, particularly a kind of hoist motor closed type hydraulic system of preventing pipelines from bursting and control method thereof.
Background technology
At present, in the crane field, crane hoisting (contain and promote and luffing) hydraulic efficiency pressure system adopts open circuit usually, installs balance cock additional and can solve the problem that load steadily descends and prevents pipelines from bursting on hoist motor.But, in the large-tonnage weight-lifting equipment,, then can have problems such as system effectiveness is low, heating is serious, the fuel tank volume is too big, running stability difference if continue to adopt open circuit.
In the large-tonnage weight-lifting equipment, adopt closed circuit, just can be good at overcoming the above problems.But, owing on the closed system motor balance cock can not be set, the inside and outside existing hydraulic lift hoist motor closed type hydraulic system in native land does not all install the anti-pipeline demolition set of hydraulic pressure additional, if the pipeline explosion takes place, only can rely on Parking Brake to carry out dynamic brake.And the dynamic brake poor effect of Parking Brake, and in dynamic brake, very easily burn, therefore just in case when the lifting weight, the flexible pipe explosion takes place, cause the born safety misadventure of weight possibly.Even if after the drg friction is burnt the weight braking has been lived, but hovering over aerial a period of time, weight is difficult to put down, this also can cause new problem.
Summary of the invention
The hoist motor closed type hydraulic system and the control method thereof that the purpose of this invention is to provide a kind of preventing pipelines from bursting are to improve the safety of hoist motor closed type hydraulic system.
Technology implementation scheme of the present invention is:
A kind of hoist motor closed type hydraulic system of preventing pipelines from bursting, it comprises that hoist motor and rising oil circuit thereof, decline oil circuit, series connection are arranged at the enclosed pump in the above-mentioned oil circuit of hoist motor; The drg and the corresponding braking electromagnetic valve thereof that connect hoist motor; Be connected to repairing oil circuit and slippage pump, oil sump tank and the oil return circuit of hoist motor oil circuit, braking electromagnetic valve; It is characterized in that also comprise a preventing pipelines from bursting device, this preventing pipelines from bursting device comprises two-way plug-in valve, change-over valve and corresponding pressure sensor; This two-way plug-in valve is arranged in the oil circuit between hoist motor and enclosed pump, and two port B mouths of this two-way plug-in valve, A mouth be the oil circuit between corresponding hoist motor and enclosed pump respectively; Change-over valve is connected by another port of pipeline and two-way plug-in valve C mouth and B mouth respectively, and this change-over valve is also established G mouth, T mouth, and the G mouth connects hoist motor decline oil circuit, and the T mouth is connected with oil sump tank; Pressure sensor is arranged in the hoist motor decline oil circuit.
Further, also comprise a safety overflow valve, this safety overflow valve connects hoist motor and enclosed pump respectively.
Described change-over valve is pilot operated directional control valve or solenoid directional control valve.
Described pilot operated directional control valve is 23 logical pilot operated valve device.
The control method of the hoist motor closed type hydraulic system of preventing pipelines from bursting of the present invention, in a closed hydraulic circuit that is formed by hoist motor, enclosed pump, the drg that connects hoist motor and corresponding braking electromagnetic valve, slippage pump and oil sump tank a preventing pipelines from bursting device is set, this preventing pipelines from bursting device comprises two-way plug-in valve, change-over valve; This two-way plug-in valve is arranged in the oil circuit between hoist motor and enclosed pump, and two port A mouths of this two-way plug-in valve, B mouth be the oil circuit between corresponding hoist motor and enclosed pump respectively; Change-over valve is connected by another port of pipeline and two-way plug-in valve C mouth and B mouth respectively, change-over valve is according to hoist motor rising mouth or port for drawdown pressure condition, cut off or connect A, B mouth passage, i.e. cut-out or connection and hoist motor bonded assembly two-way plug-in valve A mouth fluid are realized preventing pipelines from bursting.
Further, make hoist motor decline oil circuit always keep an oil compensation pressure PB, the response pressure P1 of change-over valve; When PB＞P1, change-over valve is opened, and the spool of change-over valve is moved to the left, and is communicated with the C mouth and the oil return inlet T of two-way plug-in valve, makes guide's control oil channel of two-way plug-in valve take back fuel tank, and two-way plug-in valve is in the low-pressure opening state; Because two-way plug-in valve is opened, thus no matter rise or the oil circuit that descends all is not obstructed, can normal operation, be not subjected to the influence of preventing pipelines from bursting valve; Simultaneously, drg is the normally closed of hydraulic pressure opening, and slippage pump is system's repairing, for opening and closing, drg provides operation pressure oil again, when the needs hoisting system is worked, when starting the enclosed pump, it is electric that braking electromagnetic valve is got, and connects drg and discharge oil circuit, hoist motor normal operation; When hoisting system is not worked, braking electromagnetic valve dead electricity, arrester close.
Be used for the preventing pipelines from bursting device of hoist motor closed type hydraulic system, it comprises, valve body is offered a first passage that runs through valve body, is communicated with the four-way of second, third passage of valve body with second, third passage and that first passage intersects in it; Wherein, a port A mouth of first passage connects the rising oil circuit of hoist motor closed type hydraulic system enclosed pump; Second channel is provided with the B mouth of valve body; Two-way plug-in valve is arranged in the other end of valve body first passage, and it comprises a valve pocket, is positioned at the baffle plate of valve pocket external side end, the spool of an end attached cavity, an end are positioned at the spring of the spool other end against baffle plate; Wherein, the valve pocket side has the through hole of corresponding valve body second channel; Baffle plate has through hole--two-way plug-in valve C mouth; First passage in the corresponding valve body of spool; Can conducting or the connection of sealing first, second passage by valve core movement; The explosion relief valve cover plate is arranged at the port of valve body first passage, the port T mouth of establishing a cavity in it and being communicated with cavity, A ' mouth, G mouth, P mouth, E mouth and interface channel; Wherein, the T mouth should connect oil return circuit makes oily oil sump tank, and the G mouth connects the repairing oil circuit, and A ' mouth connects two-way plug-in valve C mouth in the valve body first passage by interface channel, and the P mouth is communicated with the B mouth of valve body; The rising mouth of B mouth hoist motor rising oil circuit side; Change-over valve is arranged at by the E mouth in the cavity of explosion relief valve cover plate; Safety overflow valve is arranged at four-way one end in the valve body; Pressure measuring tie-in is arranged at the four-way other end in the valve body.
Again, the third channel middle part connects and establishes a pressure measuring tie-in that is in communication with the outside in the described valve body.
Described change-over valve is pilot operated directional control valve or solenoid directional control valve.
In addition, pilot operated directional control valve of the present invention is 23 logical pilot operated valve device.
The present invention is provided with the preventing pipelines from bursting device at hoist motor closed type hydraulic system, and the B mouth of preventing pipelines from bursting valve is directly installed on the rising mouth of HM Hydraulic Motor; The repairing oil circuit of the G mouth welding system of preventing pipelines from bursting valve; The oil return circuit of the T mouth welding system of preventing pipelines from bursting valve.Preventing pipelines from bursting valve main valve plug adopts two-way plug-in valve, and the unlatching of the pressure control pilot operated directional control valve by closed system repairing oil circuit is provided with safety overflow valve in the loop, prevent that hoist motor rising mouth pressure is too high, the protection hoist motor.
When pipeline generation explosion, the G mouth decompression of pilot operated directional control valve, the spool of pilot operated directional control valve moves down, A ' the mouth of hydraulic directional control valve is communicated with the P mouth, because A ' mouth be communicated with the C mouth of two-way plug-in valve, the P mouth is communicated with the B mouth, so that the C mouth of two-way plug-in valve and the connection of B mouth.Because the C mouth of two-way plug-in valve and B mouth are communicated with, make under the combined action of hydraulic coupling that the spool at both ends area difference of two-way plug-in valve produces and spring force and move right, A, B mouth are closed, and sealing and hoist motor bonded assembly two-way plug-in valve B mouth fluid can't drop weight.
Beneficial effect of the present invention
Hoist motor closed type hydraulic system speed of response of the present invention is fast, compare with other conventional hydraulic efficiency pressure systems, and many safety control together are provided, and actv. prevents the generation of the safety misadventure that causes owing to pipelines from bursting more;
Preventing pipelines from bursting response valve speed among the present invention is fast, be active in one's movements, through-current capability is strong, high pressure resistant and profile is succinct, compact.
Description of drawings
Fig. 1 is the scheme drawing of hoist motor closed type hydraulic system first embodiment of preventing pipelines from bursting of the present invention;
Fig. 2 is the scheme drawing of hoist motor closed type hydraulic system second embodiment of preventing pipelines from bursting of the present invention;
Fig. 3 is the scheme drawing of hoist motor closed type hydraulic system the 3rd embodiment of preventing pipelines from bursting of the present invention;
Fig. 4 is the structural representation of preventing pipelines from bursting device of the present invention.
The specific embodiment
Referring to Fig. 1, the hoist motor closed type hydraulic system of band preventing pipelines from bursting device of the present invention, it comprises that hoist motor 1 and rising oil circuit 101 thereof, decline oil circuit 102, series connection are arranged at the enclosed pump 2 in the hoist motor 1 above-mentioned oil circuit; The drg 3 and the corresponding braking electromagnetic valve 31 thereof that connect hoist motor 1; Be connected to repairing oil circuit and slippage pump 4, oil sump tank 5 and the oil return circuit of hoist motor 1 oil circuit, braking electromagnetic valve 31; One preventing pipelines from bursting device 7, this preventing pipelines from bursting device 7 comprises two-way plug-in valve 8, change-over valve---pilot operated directional control valve 9; This two-way plug-in valve 8 is arranged in the oil circuit of 2 of hoist motor 1 and enclosed pumps, and two port B mouths of this two-way plug-in valve 8, A mouth be the oil circuit of 2 of corresponding hoist motor 1 and enclosed pumps respectively; Pilot operated directional control valve 9 is connected with two port B mouths, C mouths in addition of two-way plug-in valve 8 by pipeline respectively, and this pilot operated directional control valve 9 is also established G mouth, T mouth, and the G mouth of pilot operated directional control valve 9 connects hoist motor 1 decline oil circuit 102, and the T mouth is connected with oil sump tank 5; Safety overflow valve 10,14 is arranged at the oil return circuit of 2 oil circuits of hoist motor 1 and enclosed pump and slippage pump 4 respectively.Pressure sensor 13 is arranged in the hoist motor 1 decline oil circuit 102.
Referring to Fig. 2, second embodiment of the hoist motor closed type hydraulic system of band preventing pipelines from bursting device of the present invention, in the present embodiment, change-over valve adopts solenoid directional control valve 9 ', it cooperates with pressure sensor 13 in being arranged at hoist motor 1 decline oil circuit 102, and remaining part is identical with first embodiment.According to hoist motor 1 rising mouth or port for drawdown pressure condition, cut off or connect A, B mouth passage, i.e. cut-out or connection and hoist motor bonded assembly two-way plug-in valve A mouth fluid are realized preventing pipelines from bursting.
Referring to Fig. 3, the 3rd embodiment of the hoist motor closed type hydraulic system of band preventing pipelines from bursting device of the present invention, in the present embodiment, the oil circuit of two port A mouths of two-way plug-in valve 8, the respectively corresponding hoist motor 1 of B mouth and enclosed pump 2 in the preventing pipelines from bursting device 7; Remaining part is identical with first embodiment.
Referring to Fig. 4, the present invention is used for the preventing pipelines from bursting device 7 of hoist motor closed type hydraulic system, it comprises, valve body 70, the four-way 74 of the second channel 72 of offering a first passage 71 that runs through valve body 70 in it, intersecting with first passage 71, second, third passage 72,73 that third channel 73 and is communicated with valve body 70; Wherein, a port A mouth of first passage 71 connects the rising oil circuit of hoist motor closed type hydraulic system enclosed pump 2; Two-way plug-in valve 8 is arranged in the other end of valve body first passage 71, is positioned at the spring 83 of spool 82 other ends against baffle plate 84 comprising a valve pocket 81, the baffle plate 84 that is positioned at the valve pocket external side end, the spool 82 of an end attached cavity, an end; Wherein, valve pocket 81 sides have the through hole 811 of the second channel 72 of corresponding valve body 70; Baffle plate 84 has through hole 841--two-way plug-in valve C mouth, first passage 71 in the spool 82 corresponding valve bodies 70; Can conducting or the connection of sealing first, second passage 71,72 by spool 82 motion; Explosion relief valve cover plate 75 is arranged at the port of valve body first passage 71, the port of establishing a cavity 751 in it and being communicated with cavity ... T mouth, G mouth, E mouth, interface channel 752 and with valve B mouth bonded assembly passage 753; Wherein, corresponding oil return circuit and the oil sump tank of connecting of T mouth, the G mouth connects the repairing oil circuit, and interface channel 752 connects the C mouth of two-way plug-in valve 8 valve bodies 81 bottoms in the valve body first passage; Second channel 72 is provided with a B mouth, its corresponding hoist motor 1 rising oil circuit; Pilot operated directional control valve 9 is arranged at by the E mouth in the cavity 751 of explosion relief valve cover plate 75; Safety overflow valve 10 is arranged at four-way 74 1 ends in the valve body 70; Pressure measuring tie-in 11,12 is arranged at four-way 74 other ends and interior third channel 73 middle parts of valve body in the valve body, is in communication with the outside.
The control method of the hoist motor closed type hydraulic system of band preventing pipelines from bursting device of the present invention makes hoist motor 1 decline oil circuit always keep an oil compensation pressure PB, the response pressure P1 of pilot operated directional control valve 9; When PB＞P1, the liquid controlled reversing opening of valves, the spool of pilot operated directional control valve 9 is moved to the left, and is communicated with the C mouth and the oil return inlet T of two-way plug-in valve 8, makes guide's control oil channel of two-way plug-in valve 8 take back fuel tank, and two-way plug-in valve 8 is in the low-pressure opening state; Because two-way plug-in valve 8 is opened, thus no matter rise or the oil circuit that descends all is not obstructed, can normal operation, be not subjected to the influence of preventing pipelines from bursting valve; Simultaneously, drg 3 is the normally closed of hydraulic pressure opening, and slippage pump 4 is system's repairing, for opening and closing, drg provides the guide oil sources again, when the needs hoisting system is worked, when starting the enclosed pump, it is electric that braking electromagnetic valve 31 is got, and connects drg 3 and discharge oil circuits, hoist motor 1 normal operation; When hoisting system is not worked, braking electromagnetic valve 31 dead electricity, drg 3 closures.
1, when system's normal operation, according to the characteristics of closed circuit, the decline oil circuit always keeps the oil compensation pressure PB of a 2.8MPa, and the response pressure P1 of pilot operated directional control valve 9 is about 1.5MPa, at this moment PB＞P1; Because PB＞P1, pilot operated directional control valve 9 is opened, and the spool of pilot operated directional control valve 9 is moved to the left, and has been communicated with the C mouth and the oil return inlet T of two-way plug-in valve 8, so at this moment guide's control oil channel of two-way plug-in valve 8 takes back fuel tank, two-way plug-in valve 8 is in the low-pressure opening state; Because two-way plug-in valve 8 is opened, so no matter hoist motor 1 rises or the oil circuit that descends all is not obstructed, can normal operation, be not subjected to the influence of preventing pipelines from bursting valve.This explosion relief valve is actv. in this system, also is the most important first road safety control.
Simultaneously, the drg 3 of hoisting system also provides the guarantee of another road for system, drg 3 is the normally closed of hydraulic pressure opening, slippage pump 4 both had been system's repairing, provided the guide oil sources for drg opens and closes again, when the needs hoisting system is worked, pilot operated system (electric or hydraulic pressure) is when starting main pump, it is electric that braking electromagnetic valve 31 is got, and connect drg 3 and discharge oil circuits, but the motor normal operation.When hoisting system is not worked, braking electromagnetic valve 31 dead electricity, drg 3 closures.Because this preventing pipelines from bursting valve adopts two logical inserted valves of suit high-pressure high-flow, high response speed, therefore can cut off mouthful oil circuit that rises rapidly when booster, effectively avoids drg to enter the state of dynamic brake, protects drg 3.
2, when system works, no matter rising still descends, if riser culverts generation explosion, motor stall, the pressure P B of decline oil circuit descends rapidly, is lower than the response pressure P1 (being made as 1.5MPa) of pilot operated directional control valve 9 as decline oil circuit pressure P B, when being PB＜P1, pilot operated directional control valve 9 resets; So because the A mouth pressure of riser culverts explosion two-way plug-in valve 8 is zero, this moment, two-way plug-in valve 8 was at spring force F
xEffect under rapidly to moving to left, meanwhile reset owing to pilot operated directional control valve 9, guide's control oil channel of two-way plug-in valve 8 is set up pressure, because the pressure at both sides of two-way plug-in valve 8 equates, and the spring cavity area A 2 of two-way plug-in valve 8 is greater than the annulus area A1 of two-way plug-in valve 8, by F=P*A as can be known, the suffered power F in the right side of two-way plug-in valve 8
RightGreater than the suffered power F in left side
A left sideSo two-way plug-in valve 8 is at F
RightAnd F
xCombined action under close rapidly; Two-way plug-in valve 8 is closed, and cuts off hoist motor 1 a rising mouthful oil circuit, prevents that effectively weight from dropping suddenly, avoids taking place safety misadventure.This be system the first road safety control, simultaneously drg 3 also will be as the second road safety control of system.After the pressure P B of decline oil circuit decompression, then oil compensation pressure (pilot pressure) also will be by 6 releases of repairing check valve, drg 3 oil circuit decompressions then, drg 3 closures.
3, when system works, no matter rising still descends, in case decline pipeline generation explosion, the pressure P B of decline oil circuit is zero, is lower than the response pressure P1 of pilot operated directional control valve 9, i.e. PB＜P1, and pilot operated directional control valve 9 resets; Because the decline pipelines from bursting causes pilot operated directional control valve to reset, two-way plug-in valve 8 is closed (the pass closed procedure of two-way plug-in valve 4 together 2.).Because two-way plug-in valve 8 is closed, pipeline is normal between the A mouth of the A mouth of enclosed pump and two-way plug-in valve 8 simultaneously, so do not exist weight that the danger of tenesmus takes place.Equally, after the pressure P B of decline oil circuit decompression, oil compensation pressure (pilot pressure) also will be by 6 releases of repairing check valve, drg oil circuit decompression then, arrester close.
If 4 loads are bigger; in case pipeline generation explosion, two-way plug-in valve 8 is closed rapidly, between the B mouth of the rising mouth of hoist motor 1 and two-way plug-in valve 8; fluid can produce bigger hydraulic efficiency impact; this impact may cause damage to motor, therefore in the parallel connection of the next door of two-way plug-in valve 8 safety overflow valve 10, the setting pressure of this valve is 35MPa; when in case pressure is higher than 35MPa; safety overflow valve 10 is opened, and fluid is protected hoist motor 1 effectively by safety overflow valve 10 overflows.
In sum, the present invention is applied to crane hoisting (contain promote and the luffing) closed fhdraulic system in crane field, adopts a preventing pipelines from bursting device, the efficient height, is quick on the draw.In case pipeline generation explosion, the twice safety control can be provided: the first road safety control is that the preventing pipelines from bursting device can be closed rapidly behind the pipelines from bursting, effectively prevents the unexpected tenesmus that weight is caused by pipelines from bursting, and can prevent that motor rising mouth pressure is too high, the protection HM Hydraulic Motor; The second road safety control is, the pipelines from bursting rear brake discharges the oil circuit decompression, and arrester close more effectively prevents the unexpected tenesmus that weight is caused by pipelines from bursting.Because the preventing pipelines from bursting device is closed rapidly, cut off mouthful oil circuit that rises, can effectively avoid drg to enter the state of dynamic brake, the protection drg makes it injury-free.
Claims (10)
1. the hoist motor closed type hydraulic system of a preventing pipelines from bursting, it comprises that hoist motor and rising oil circuit thereof, decline oil circuit, series connection are arranged at the enclosed pump in the above-mentioned oil circuit of hoist motor; The drg and the corresponding braking electromagnetic valve thereof that connect hoist motor; Be connected to repairing oil circuit and slippage pump, oil sump tank and the oil return circuit of hoist motor oil circuit, braking electromagnetic valve; It is characterized in that also comprise a preventing pipelines from bursting device, this preventing pipelines from bursting device comprises two-way plug-in valve, change-over valve and corresponding pressure sensor; This two-way plug-in valve is arranged in the oil circuit between hoist motor and enclosed pump, and two port B mouths of this two-way plug-in valve, A mouth be the oil circuit between corresponding hoist motor and enclosed pump respectively; Change-over valve is connected by another port of pipeline and two-way plug-in valve C mouth and B mouth respectively, and this change-over valve is also established G mouth, T mouth, and the G mouth connects hoist motor decline oil circuit, and the T mouth is connected with oil sump tank; Pressure sensor is arranged in the hoist motor decline oil circuit.
2. the hoist motor closed type hydraulic system of preventing pipelines from bursting as claimed in claim 1 is characterized in that, also comprises a safety overflow valve, and this safety overflow valve connects hoist motor and enclosed pump respectively.
3. the hoist motor closed type hydraulic system of preventing pipelines from bursting as claimed in claim 1 is characterized in that, described change-over valve is pilot operated directional control valve or solenoid directional control valve.
4. the hoist motor closed type hydraulic system of preventing pipelines from bursting as claimed in claim 3 is characterized in that, described pilot operated directional control valve is 23 logical pilot operated valve device.
5. the control method of the hoist motor closed type hydraulic system of preventing pipelines from bursting as claimed in claim 1, in a closed hydraulic circuit that is formed by hoist motor, enclosed pump, the drg that connects hoist motor and corresponding braking electromagnetic valve, slippage pump and oil sump tank a preventing pipelines from bursting device is set, this preventing pipelines from bursting device comprises two-way plug-in valve, change-over valve; This two-way plug-in valve is arranged in the oil circuit between hoist motor and enclosed pump, and two port B mouths of this two-way plug-in valve, A mouth be the oil circuit between corresponding hoist motor and enclosed pump respectively; Change-over valve is connected by another port of pipeline and two-way plug-in valve C mouth and B mouth respectively, change-over valve is according to hoist motor rising mouth or port for drawdown pressure condition, cut off or connect A, B mouth passage, i.e. cut-out or connection and hoist motor bonded assembly two-way plug-in valve A mouth fluid are realized preventing pipelines from bursting.
6. the control method of the hoist motor closed type hydraulic system of preventing pipelines from bursting as claimed in claim 5 is characterized in that, makes hoist motor decline oil circuit always keep an oil compensation pressure PB, the response pressure P1 of change-over valve; When PB＞P1, change-over valve is opened, and the spool of change-over valve is moved to the left, and is communicated with the C mouth of two-way plug-in valve and the oil return inlet T of oil sump tank, makes guide's control oil channel of two-way plug-in valve take back fuel tank, and two-way plug-in valve is in the low-pressure opening state; Because two-way plug-in valve is opened, thus no matter rise or the oil circuit that descends all is not obstructed, can normal operation, be not subjected to the influence of preventing pipelines from bursting device; Simultaneously, drg is the normally closed of hydraulic pressure opening, and slippage pump is system's repairing, for opening and closing, drg provides operation pressure oil again, when the needs hoisting system is worked, when starting the enclosed pump, it is electric that braking electromagnetic valve is got, and connects drg and discharge oil circuit, hoist motor normal operation; When hoisting system is not worked, braking electromagnetic valve dead electricity, arrester close.
7. the preventing pipelines from bursting device that is used for hoist motor closed type hydraulic system, it is characterized in that, comprise that valve body is offered a first passage that runs through valve body, is communicated with the four-way of second, third passage of valve body with second, third passage and that first passage intersects in it; Wherein, a port A mouth of first passage connects the rising oil circuit of hoist motor closed type hydraulic system enclosed pump; Second channel is provided with the B mouth of valve body;
Two-way plug-in valve is arranged in the other end of valve body first passage, and it comprises a valve pocket, is positioned at the baffle plate of valve pocket external side end, the spool of an end attached cavity, an end are positioned at the spring of the spool other end against baffle plate; Wherein, the valve pocket side has the through hole of corresponding valve body second channel; Baffle plate has through hole--two-way plug-in valve C mouth; First passage in the corresponding valve body of spool; Can conducting or the connection of sealing first, second passage by valve core movement;
The explosion relief valve cover plate is arranged at the port of valve body first passage, the port T mouth of establishing a cavity in it and being communicated with cavity, A ' mouth, G mouth, P mouth, E mouth and interface channel; Wherein, the T mouth should connect oil return circuit makes oily oil sump tank, and the G mouth connects the repairing oil circuit, and A ' mouth connects two-way plug-in valve C mouth in the valve body first passage by interface channel, and the P mouth is communicated with the B mouth of valve body; The B mouth is communicated with the rising mouth of hoist motor rising oil circuit side;
Change-over valve is arranged at by the E mouth in the cavity of explosion relief valve cover plate;
Safety overflow valve is arranged at four-way one end in the valve body;
Pressure measuring tie-in is arranged at the four-way other end in the valve body.
8. the preventing pipelines from bursting device that is used for hoist motor closed type hydraulic system as claimed in claim 7 is characterized in that, the third channel middle part connects and establishes a pressure measuring tie-in that is in communication with the outside in the described valve body.
9. the preventing pipelines from bursting device that is used for hoist motor closed type hydraulic system as claimed in claim 7 is characterized in that described change-over valve is pilot operated directional control valve or solenoid directional control valve.
10. the preventing pipelines from bursting device that is used for hoist motor closed type hydraulic system as claimed in claim 9 is characterized in that, described pilot operated directional control valve is 23 logical pilot operated valve device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100497263A CN101537984B (en) | 2009-04-21 | 2009-04-21 | Hoist motor closed type hydraulic system for preventing pipelines from bursting and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100497263A CN101537984B (en) | 2009-04-21 | 2009-04-21 | Hoist motor closed type hydraulic system for preventing pipelines from bursting and control method thereof |
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| CN101537984A CN101537984A (en) | 2009-09-23 |
| CN101537984B true CN101537984B (en) | 2011-04-13 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102030267B (en) * | 2011-01-17 | 2012-09-05 | 徐州重型机械有限公司 | Hoist and closed hydraulic system thereof |
| CN102303422A (en) * | 2011-09-26 | 2012-01-04 | 南通锻压设备股份有限公司 | Safety device for burst of hydraulic oil circuit of hydraulic press sliding block |
| CN102734241B (en) * | 2012-06-27 | 2014-12-10 | 三一重工股份有限公司 | Opened and closed hydraulic system and engineering machinery |
| CN102718162B (en) * | 2012-06-29 | 2014-12-17 | 上海三一科技有限公司 | Winch hydraulic system safety device and crane |
| CN102992194B (en) * | 2012-11-30 | 2015-01-14 | 三一重工股份有限公司 | Crane, hydraulic assembly of crane, and method for controlling crane |
| CN103232005B (en) * | 2013-05-08 | 2015-09-02 | 昆山晋桦豹胶轮车制造有限公司 | A kind of hydraulic lifting apparatus with pipeline explosion-proof function |
| CN103613021B (en) * | 2013-11-11 | 2016-05-04 | 长沙中联消防机械有限公司 | Winch hydraulic control system and engineering machinery |
| CN105605001B (en) * | 2016-03-17 | 2017-08-04 | 上海振华重工(集团)股份有限公司 | A kind of enclosed elevator hydraulic safe valve group |
| CN111237294B (en) * | 2020-01-10 | 2021-10-19 | 浙江中锐重工科技有限公司 | Hydraulic system of walking pile driver |
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Effective date of registration: 20160108 Address after: Eight in the 313028 Zhejiang city of Huzhou province Cao Zhen Village daily standard factory Auxiliary Building No. 2 Patentee after: Zhejiang Sany Equipment Co., Ltd. Address before: 201200 Shanghai City Sichuan Road Pudong New Area Chuansha economic Park No. 319 Patentee before: Shanghai Sany Technology Co., Ltd. |