CN207632362U - Emergent overload protective device - Google Patents

Abstract

The utility model provides a kind of emergent overload protective device, including hydraulic pump, reversal valve, safety valve, balanced valve, hydraulic motor, brake, winch and fuel tank, fuel tank, hydraulic pump, reversal valve and hydraulic motor form open circuit, the oil outlet of hydraulic pump is equipped with safety valve, hydraulic motor drives winch, the hydraulic fluid port that hydraulic motor corresponds to winch vertical motion is equipped with balanced valve, winch is equipped with brake, winch is tied with steel wire rope and is equipped with suspender, it further include the emergent overload protection valve being arranged between hydraulic pump and reversal valve, repairing oil sources, control oil sources, second shuttle valve, third shuttle valve, brake control valve and brake release oil sources.Overload protective device provided by the utility model is safe and reliable; it is possible to prevente effectively from loop wheel machine causes to damage because of overload; suitable for open type hydraulic system; keep loop wheel machine function more comprehensive; control is more reasonable; in the case of realizing that loop wheel machine damage is shut down by the way that emergent decentralization circuit is arranged, cargo can safety decentralization, ensure loop wheel machine and platform safety.

Description

Emergent overload protective device

Technical field

The utility model is related to a kind of emergent overload protective devices, are used for loop wheel machine elevator winch, belong to lifting equipment technology Field.

Background technology

The especially marine loop wheel machine such as jack up used of existing loop wheel machine or semisubmersible drilling platform loop wheel machine, were using It is possible that suspension hook is recharged ship or other motive objects tangle in journey, since tender or other motive objects are under wind wave action It can move therefore suspension hook can be caused, which to pull loop wheel machine, makes loop wheel machine overload, so as to cause loop wheel machine structural damage, under serious conditions, loop wheel machine meeting It caves in and as tender or other motive objects sink to seabed together, consequence is very serious, loop wheel machine is as marine important in addition Safety equipment, if loop wheel machine damages, it will the normal operation of platform is seriously affected, especially if loop wheel machine is dashed forward in hoisting process So damage, weight hover in the air it is abnormally dangerous, if under extreme case typhoon arrive before weight cannot fall safely, gently then Damage loop wheel machine, safety that is heavy then threatening entire platform.

Invention content

The purpose of this utility model is to provide a kind of emergent overload protective devices, it is possible to prevente effectively from loop wheel machine is due to overload Cause to damage, while can accomplish to transfer weight safely after loop wheel machine damages, avoids that accident occurs.

To solve the above problems, the utility model provides a kind of emergent overload protective device, including hydraulic pump, reversal valve, Safety valve, balanced valve, hydraulic motor, brake, winch and fuel tank, the fuel tank, the hydraulic pump, the reversal valve and the liquid Pressure motor forms open circuit, and the oil outlet of the hydraulic pump is equipped with safety valve, and the hydraulic motor drives the winch, described The hydraulic fluid port that hydraulic motor corresponds to the winch vertical motion is equipped with the balanced valve, and the winch is equipped with the brake, institute It states winch to be tied with steel wire rope and be equipped with suspender, further includes that the emergent overload being arranged between the hydraulic pump and the reversal valve is protected Protect valve, repairing oil sources, control oil sources, the second shuttle valve, third shuttle valve, brake control valve and brake release oil sources, the reversal valve Two actuator ports be respectively communicated with two oil inlets of second shuttle valve, the oil outlet of second shuttle valve is connected to the third The oil outlet of one oil inlet of shuttle valve, the third shuttle valve is connected to the hydraulic control mouth of the brake control valve, the balanced valve Control mouth connects the brake by the brake control valve with the liberation port of the brake and discharges oil sources, the brake control valve Spring position so that the control mouth of the balanced valve and the liberation port draining of the brake, the control bit of the brake control valve is made institute It states the control mouth of balanced valve and the liberation port of the brake connects the brake release oil sources, the oil of the emergent overload protection valve Mouthful it include P mouthfuls, T mouthfuls, A mouthfuls, B mouthfuls, T1 mouthfuls, C1 mouthfuls, C2 mouthfuls and C3 mouthfuls, described P mouthfuls is connected to A mouthfuls, described between A mouthfuls and B mouthful Two logical logical valves are provided with, the hydraulic fluid port of the two logical logical valve includes a mouthfuls, b mouthfuls and x mouthfuls, and described A mouthfuls is connected to described a mouthfuls, institute It states B mouthfuls to be connected to described b mouthfuls, described A mouthfuls is also connected to by the first check valve x mouthfuls described respectively with described B mouthfuls, and described two logical patrol By pilot operated directional control valve equipped with overload protection overflow valve, the spring position of the pilot operated directional control valve makes x mouthfuls described the x mouthfuls of volume valve The control bit of cut-off, the pilot operated directional control valve makes the x mouthfuls of connection overload protection overflow valve, the emergent overload protection valve The C2 mouthfuls and it is P mouthfuls described between successively be equipped with the first pilot operated directional control valve, pressure reducing valve and the second check valve, first hydraulic control The spring position of reversal valve makes the entrance of the pressure reducing valve be connected to described T1 mouthful, described in the control bit of first pilot operated directional control valve makes Described C2 mouthful, the T mouthfuls of the emergent overload protection valve of the entrance connection of pressure reducing valve and it is B mouthfuls described between equipped with logical valve, The control port of the logical valve is connected to described T1 mouthfuls by the second pilot operated directional control valve, the spring position of second pilot operated directional control valve The control port of the logical valve is set to be connected to described T1 mouthfuls, the control bit of second pilot operated directional control valve makes the control of the logical valve Liquefaction mouth ends, and the logical valve, in cut-off position, connection is in its control port draining when its control port ends , emergent decentralization pilot operated directional control valve is also equipped between described B mouthfuls and A mouthful successively, meets an urgent need and transfers throttle valve and third check valve, institute Stating the spring position of emergent decentralization pilot operated directional control valve makes the emergent decentralization throttle valve end with described B mouthfuls, the emergent lower tapping The control bit of control reversal valve makes described B mouthfuls to connect with described A mouthfuls by the emergent decentralization throttle valve and the third check valve Logical, the hydraulic control mouth of the pilot operated directional control valve connects described C1 mouthfuls by overload protection solenoid valve, and the overload protection solenoid valve is not Described T1 mouthfuls of the hydraulic control mouth connection of the pilot operated directional control valve, overload protection solenoid valve liquid controlled reversing when obtaining electric when obtaining electric The hydraulic control mouth of valve is connected to described C1 mouthfuls, and the first shuttle valve is additionally provided on the oil outlet of the overload protection solenoid valve, and the overload is protected The oil outlet of shield solenoid valve is connected to one of first shuttle valve into there is a mouth, the hydraulic control mouth of first pilot operated directional control valve and described The hydraulic control mouth of second pilot operated directional control valve is connected to the oil outlet of described C3 mouthfuls and first shuttle valve, the emergent decentralization liquid controlled reversing The hydraulic control mouth of valve connects described C1 mouthful by emergent decentralization solenoid valve, the emergent decentralization solenoid valve when must not be electric it is described meet an urgent need under Put described T1 mouthfuls of the hydraulic control mouth connection of pilot operated directional control valve, the emergent decentralization solenoid valve emergent decentralization liquid controlled reversing when obtaining electric Valve hydraulic control mouth connection it is described C1 mouthful, it is described it is emergent transfer solenoid valve oil outlet be also connected to first shuttle valve another into Hydraulic fluid port, the oil outlet of the P mouthfuls of the emergent overload protection valve connection hydraulic pumps, described T mouthfuls be connected to described T1 mouthfuls The fuel tank, the oil inlet of the A mouthfuls of connection reversal valve, the oil return opening of the B mouthfuls of connection reversal valve are C1 mouthfuls described Be connected to the control oil sources, the C2 mouthfuls of connection repairing oil sources, described C3 mouthful be connected to the third shuttle valve another into Hydraulic fluid port.

Further, the pilot operated directional control valve is two position and four-way reversing valves, and oil inlet is saved by first throttle valve and second Stream valve is connected to the x mouthfuls of described two logical logical valves, and an actuator port of the pilot operated directional control valve is protected equipped with the overload Protect overflow valve, another actuator port cut-off of the pilot operated directional control valve.

Further, total overload protection overflow valve, total overload protection are additionally provided on the x mouthfuls of described two logical logical valves Overflow valve and it is x mouthfuls described between be equipped with the second throttle.

Further, the oil outlet of the overload protection solenoid valve is additionally provided with overload protection pressure sensor, and the overload is protected Protect pressure sensor on carry pressure display table, first check valve and it is x mouthfuls described between be additionally provided with third throttle valve.

Further, the driving input terminal in the winch is arranged in the brake, and the brake carries holdback, the winch When vertical motion, the brake need not open, and when the winch lowering action, the brake needs to open.

The utility model also provides the working method of above-mentioned emergent overload protective device, including ascending fashion, drop mode, Protected mode and emergent lower mode playback：

Ascending fashion：Start the hydraulic pump, the reversal valve is switched into upper raise-position, after hydraulic pump pressurization Oil enters the reversal valve through the emergent overload protection valve, then enters the hydraulic motor through the balanced valve, presses simultaneously The hydraulic control mouth that power oil enters the brake control valve through second shuttle valve and the third shuttle valve makes the brake control Valve is in control bit, and the brake release oil sources is connected to the brake, the brake is opened, to drive on the winch It rises, the oil return of the hydraulic motor flows back to fuel tank, the overload protection through the reversal valve and the emergent overload protection valve Solenoid valve and the emergent decentralization solenoid valve must not be electric, and inside the emergent overload protection valve, P mouthfuls of the pressure oil is through institute It states the first check valve to close described two logical logical valves into described x mouthfuls, first pilot operated directional control valve, second hydraulic control are changed It is in spring position to valve and the emergent decentralization pilot operated directional control valve, the logical valve is in connection position, the pressure reducing valve connection It is T1 mouthfuls described；

Drop mode：Start the hydraulic pump, the reversal valve is switched into lower decrease, after hydraulic pump pressurization Oil enters the hydraulic motor through the emergent overload protection valve and the reversal valve, at the same pressure oil through second shuttle valve and The hydraulic control mouth that the third shuttle valve enters the brake control valve makes the brake control valve be in control bit, and the brake is released The source of draining the oil is connected to the liberation port of the control mouth and the brake of the balanced valve, and the balanced valve and the brake are opened, from And the winch is driven to decline, the oil return of the hydraulic motor flows back to oil through the reversal valve and the emergent overload protection valve Case, the overload protection solenoid valve and the emergent decentralization solenoid valve must not be electric, described inside the emergent overload protection valve P mouthfuls of pressure oil enters described x mouthfuls through first check valve and closes described two logical logical valves, first liquid controlled reversing Valve, second pilot operated directional control valve and the emergent decentralization pilot operated directional control valve are in spring position, and the logical valve is in connection Position, described T1 mouthfuls of the pressure reducing valve connection；

Protected mode：Control the reversal valve and switch to lower decrease, control the overload protection solenoid valve obtain it is electric, it is described to answer Anxious decentralization solenoid valve must not be electric, and inside the emergent overload protection valve, described C3 mouthfuls through the described C1 mouthfuls connection control oil Source, the pilot operated directional control valve are in control bit, and described x mouthfuls is connected to the overload protection overflow valve, institute through the pilot operated directional control valve It states the first pilot operated directional control valve and second pilot operated directional control valve is in control bit, the emergent decentralization pilot operated directional control valve is in bullet Spring position, the logical valve are in cut-off position, and the pressure reducing valve is connected to the repairing oil sources, and the pressure oil of the control oil sources is through institute The hydraulic control mouth for stating C3 mouthfuls and the third shuttle valve into the brake control valve makes the brake control valve be in control bit, institute The liberation port that brake release oil sources is connected to the control mouth and the brake of the balanced valve is stated, by the balanced valve and the brake It opens, the winch can passively decline under the effect of external force at this time, and keep some tension；

Emergent lower mode playback：It controls the reversal valve and switches to lower decrease, obtaining for the emergent decentralization solenoid valve of control is electric, described Overload protection solenoid valve must not be electric, and inside the emergent overload protection valve, described C3 mouthfuls through the described C1 mouthfuls connection control Oil sources, the emergent decentralization pilot operated directional control valve, first pilot operated directional control valve and second pilot operated directional control valve are in control Position, the pilot operated directional control valve are in spring position, and the logical valve is in cut-off position, and the pressure reducing valve is connected to the repairing oil sources, Described B mouthfuls is connected to the A by the emergent decentralization pilot operated directional control valve, the emergent decentralization throttle valve with the third check valve Mouthful, while the pressure oil of the control oil sources enters the hydraulic control mouth of the brake control valve through described C3 mouthfuls and the third shuttle valve So that the brake control valve is in control bit, the brake release oil sources is connected to the control mouth of the balanced valve and the brake Liberation port, the balanced valve and the brake are opened, at this time the winch under the action of hanging loading object gravity controllably It is lower to incite somebody to action.

Compared with prior art, the technical solution of the utility model has the following advantages：

Overload protective device and its working method provided by the utility model are safe and reliable, it is possible to prevente effectively from loop wheel machine is because of mistake It carries and causes to damage, especially suitable for open type hydraulic system, the loop wheel machine function of making is more comprehensive, and control is more reasonable, by setting It sets decentralization circuit of meeting an urgent need and realizes that loop wheel machine damages in the case of shutdown, the decentralization that can cargo safe ensures loop wheel machine and platform safety.

Description of the drawings

Fig. 1 is the principle schematic of the utility model embodiment one；

In figure：1 is hydraulic pump, and 2 be reversal valve, and 3 be safety valve, and 4 be balanced valve, and 5 be hydraulic motor, and 6 be brake, and 7 are Winch, 8 be emergent overload protection valve, and 9 be repairing oil sources, and 10 oil sources in order to control, 11 be two logical logical valves, and 12 is unidirectional for first Valve, 13 be pilot operated directional control valve, and 14 be overload protection overflow valve, and 15 be the first pilot operated directional control valve, and 16 be pressure reducing valve, and 17 is single for second Pilot operated directional control valve is transferred to be emergent to valve, 18,19 be logical valve, and 20 be the second pilot operated directional control valve, and 21 be pressure display table, 22 transfer throttle valve to be emergent, and 23 be total overload protection overflow valve, and 24 be overload protection pressure sensor, and 25 be first throttle Valve, 26 be second throttle, and 27 be third throttle valve, and 28 be overload protection solenoid valve, and 29 be third check valve, and 30 be the first shuttle Valve, 31 be emergent decentralization solenoid valve, and 32 be the second shuttle valve, and 33 be third shuttle valve, and 34 be brake control valve, and 35 be brake release oil Source.

Specific implementation mode

It is understandable to enable the above objects, features, and advantages of the utility model to become apparent, below in conjunction with the accompanying drawings to this The specific embodiment of utility model is described in detail.

Those skilled in the art of the present technique are appreciated that unless otherwise defined all terms used herein include technology art Language and direction term have meaning identical with the general understanding of the those of ordinary skill in the utility model fields.

Embodiment

A kind of emergent overload protective device as shown in Figure 1, including hydraulic pump 1, reversal valve 2, safety valve 3, balanced valve 4, liquid Pressure motor 5, brake 6, winch 7 and fuel tank, the fuel tank, the hydraulic pump 1, the reversal valve 2 and the hydraulic motor 5 form The oil outlet of open circuit, the hydraulic pump 1 is equipped with safety valve 3, and the hydraulic motor 5 drives the winch 7, the hydraulic pressure horse The hydraulic fluid port that 7 vertical motion of winch is corresponded to up to 5 is equipped with the balanced valve 4, and the winch 7 is equipped with the brake 6, described Winch 7 is tied with steel wire rope and is equipped with suspender, further includes the emergent overload being arranged between the hydraulic pump 1 and the reversal valve 2 Protect valve 8, repairing oil sources 9, control oil sources 10, the second shuttle valve 32, third shuttle valve 33, brake control valve 34 and brake release oil sources 35, two actuator ports of the reversal valve 2 are respectively communicated with two oil inlets of second shuttle valve 32, second shuttle valve 32 Oil outlet is connected to an oil inlet of the third shuttle valve 33, and the oil outlet of the third shuttle valve 33 is connected to the brake control valve The liberation port of 34 hydraulic control mouth, the control mouth of the balanced valve 4 and the brake 6 is connected described by the brake control valve 34 Brake release oil sources 35, the spring position of the brake control valve 34 make the release of the control mouth and the brake 6 of the balanced valve 4 The control bit of mouth draining, the brake control valve 34 makes the control mouth of the balanced valve 4 connect institute with the liberation port of the brake 6 Brake release oil sources 35 is stated, the hydraulic fluid port of the emergent overload protection valve 8 includes P mouthfuls, T mouthfuls, A mouthfuls, B mouthfuls, T1 mouthfuls, C1 mouthfuls, C2 mouthfuls With C3 mouthfuls, described P mouthfuls is connected to A mouthfuls, and two logical logical valves 11 are provided between described A mouthfuls and B mouthful, the two logical logical valve 11 Hydraulic fluid port includes a mouthfuls, b mouthfuls and x mouthfuls, and described A mouthfuls is connected to described a mouthfuls, and described B mouthfuls is connected to described b mouthfuls, described A mouthfuls and the B Mouth is also connected to by the first check valve 12 x mouthfuls described respectively, and the x mouthfuls of the two logical logical valve 11 pass through pilot operated directional control valve 13 Equipped with overload protection overflow valve 14, the spring position of the pilot operated directional control valve 13 makes the x mouthfuls of cut-off, the pilot operated directional control valve 13 Control bit makes the x mouthfuls of connection overload protection overflow valve 14, the C2 mouthful and the P of the emergent overload protection valve 8 The first pilot operated directional control valve 15, pressure reducing valve 16 and the second check valve 17 are equipped between mouthful successively, first pilot operated directional control valve 15 Spring position makes the entrance of the pressure reducing valve 16 be connected to described T1 mouthfuls, and the control bit of first pilot operated directional control valve 15 makes the decompression Described C2 mouthful, the T mouthfuls of the emergent overload protection valve 8 of the entrance connection of valve 16 and it is B mouthfuls described between equipped with logical valve 19, The control port of the logical valve 19 be connected to by the second pilot operated directional control valve 20 it is T1 mouthfuls described, second pilot operated directional control valve 20 Spring position makes the control port of the logical valve 19 be connected to described T1 mouthful, described in the control bit of second pilot operated directional control valve 20 makes The control port of logical valve 19 ends, and the logical valve 19 is in cut-off position when its control port ends, in its control port Also it is equipped with emergent decentralization pilot operated directional control valve 18, emergent decentralization throttling when draining successively between connection position, described B mouthfuls and A mouthful The spring position of valve 22 and third check valve 29, the emergent decentralization pilot operated directional control valve 18 makes the emergent decentralization throttle valve 22 and institute State B mouthfuls of cut-offs, the control bit of the emergent decentralization pilot operated directional control valve 18 make described B mouthfuls by the emergent decentralization throttle valve 22 with And the third check valve 29 is connected to described A mouthfuls, the hydraulic control mouth of the pilot operated directional control valve 13 passes through overload protection solenoid valve 28 Connect C1 mouthfuls described, the hydraulic control mouth connection T1 of the pilot operated directional control valve 13 when must not be electric of the overload protection solenoid valve 28 Mouthful, described C1 mouthfuls of the hydraulic control mouth connection of the overload protection solenoid valve 28 pilot operated directional control valve 13 when obtaining electric, the overload is protected It protects on the oil outlet of solenoid valve 28 and is additionally provided with the first shuttle valve 30, the oil outlet connection described first of the overload protection solenoid valve 28 One of shuttle valve 30 is into having mouth, the hydraulic control mouth of the hydraulic control mouth of first pilot operated directional control valve 15 and second pilot operated directional control valve 20 It is connected to the oil outlet of described C3 mouthfuls and first shuttle valve 30, the hydraulic control mouth of the emergent decentralization pilot operated directional control valve 18, which passes through, meets an urgent need Decentralization solenoid valve 31 connects C1 mouthfuls described, the emergent decentralization pilot operated directional control valve 18 when must not be electric of the emergent decentralization solenoid valve 31 Hydraulic control mouth connection it is described T1 mouthful, it is described it is emergent decentralization solenoid valve 31 it is electric when it is described it is emergent transfer pilot operated directional control valve 18 hydraulic control The oil outlet of described C1 mouthfuls of mouth connection, the emergent decentralization solenoid valve 31 is also connected to another oil inlet of first shuttle valve 30 Mouthful, the P mouthful of the emergent overload protection valve 8 be connected to the oil outlet of the hydraulic pump 1, described T mouthfuls be connected to described T1 mouthfuls The fuel tank, the described A mouthfuls oil inlet for being connected to the reversal valve 2, the described B mouthfuls oil return opening for being connected to the reversal valve 2, the C1 Mouth is connected to the control oil sources 10, and the C2 mouthfuls of connection repairing oil sources 9, described C3 mouthfuls is connected to the another of the third shuttle valve 33 One oil inlet.

The pilot operated directional control valve 13 is two position and four-way reversing valves, and oil inlet passes through first throttle valve 25 and second throttle The x mouthfuls of the 26 connection two logical logical valves 11, an actuator port of the pilot operated directional control valve 13 is equipped with the overload Protect overflow valve 14, another actuator port cut-off of the pilot operated directional control valve 13.

Total overload protection overflow valve 23 is additionally provided on the x mouthfuls of the two logical logical valve 11, total overload protection overflows Flow valve 23 and it is x mouthful described between equipped with the second throttle 26.

The oil outlet of the overload protection solenoid valve 28 is additionally provided with overload protection pressure sensor 24, the overload protection pressure On force snesor 24 carry pressure display table 21, first check valve 12 and it is x mouthfuls described between be additionally provided with third throttle valve 27.

Working method

A kind of working method of emergent overload protective device, including ascending fashion, drop mode, protected mode and it is emergent under Mode playback：

Ascending fashion：Start the hydraulic pump 1, the reversal valve 2 is switched into upper raise-position, pressurizes through the hydraulic pump 1 Oil afterwards enters the reversal valve 2 through the emergent overload protection valve 8, then enters the hydraulic motor through the balanced valve 4 5, while hydraulic control mouth of the pressure oil through second shuttle valve 32 and the third shuttle valve 33 into the brake control valve 34 makes It obtaining the brake control valve 34 and is in control bit, the brake release oil sources 35 is connected to the brake 6, the brake 6 is opened, To drive the winch 7 to rise, the oil return of the hydraulic motor 5 is through the reversal valve 2 and the emergent overload protection valve 8 Fuel tank is flowed back to, the overload protection solenoid valve 28 and the emergent decentralization solenoid valve 31 must not be electric, in the emergent overload protection Inside valve 8, P mouthfuls of the pressure oil enters described x mouthfuls through first check valve 12 and closes described two logical logical valves 11, institute It states the first pilot operated directional control valve 15, second pilot operated directional control valve 20 and the emergent decentralization pilot operated directional control valve 18 and is in spring Position, the logical valve 19 are in connection position, and the pressure reducing valve 16 is connected to T1 mouthfuls described；

Drop mode：Start the hydraulic pump 1, the reversal valve 2 is switched into lower decrease, pressurizes through the hydraulic pump 1 Oil afterwards enters the hydraulic motor 5 through the emergent overload protection valve 8 and the reversal valve 2, while pressure oil is through described the The hydraulic control mouth that two shuttle valves 32 and the third shuttle valve 33 enter the brake control valve 34 makes the brake control valve 34 be in Control bit, the brake release oil sources 35 are connected to the liberation port of the control mouth and the brake 6 of the balanced valve 4, will be described flat Weigh valve 4 and the brake 6 opened, to drive the winch 7 to decline, the oil return of the hydraulic motor 5 through the reversal valve 2 with And the emergent overload protection valve 8 flows back to fuel tank, the overload protection solenoid valve 28 and the emergent decentralization solenoid valve 31 must not Electricity, inside the emergent overload protection valve 8, P mouthfuls of the pressure oil enters described x mouthfuls by institute through first check valve 12 State the closing of two logical logical valves 11, first pilot operated directional control valve 15, second pilot operated directional control valve 20 and the emergent lower tapping Control reversal valve 18 is in spring position, and the logical valve 19 is in connection position, and the pressure reducing valve 16 is connected to T1 mouthfuls described；

Protected mode：It controls the reversal valve 2 and switches to lower decrease, control the overload protection solenoid valve 28 and obtain electric, institute Stating emergent decentralization solenoid valve 31 must not be electric, and inside the emergent overload protection valve 8, described C3 mouthfuls through described in described C1 mouthfuls connection Oil sources 10 is controlled, the pilot operated directional control valve 13 is in control bit, and described x mouthfuls is connected to the overload through the pilot operated directional control valve 13 and protects Protect overflow valve 14, first pilot operated directional control valve 15 and second pilot operated directional control valve 20 are in control bit, it is described it is emergent under It puts pilot operated directional control valve 18 and is in spring position, the logical valve 19 is in cut-off position, and the pressure reducing valve 16 is connected to the repairing oil sources 9, the pressure oil of the control oil sources 10 enters the hydraulic control of the brake control valve 34 through described C3 mouthfuls and the third shuttle valve 33 Mouthful so that the brake control valve 34 be in control bit, the brake release oil sources 35 be connected to the control mouth of the balanced valve 4 with The liberation port of the brake 6 opens the balanced valve 4 and the brake 6, and the winch 7 can be in the effect of external force at this time Lower passive decline, and keep some tension；

Emergent lower mode playback：It controlling the reversal valve 2 and switches to lower decrease, obtaining for the emergent decentralization solenoid valve 31 of control is electric, The overload protection solenoid valve 28 must not be electric, and inside the emergent overload protection valve 8, described C3 mouthfuls through described C1 mouthfuls connection institute State control oil sources 10, the emergent decentralization pilot operated directional control valve 18, first pilot operated directional control valve 15 and second liquid controlled reversing Valve 20 is in control bit, and the pilot operated directional control valve 13 is in spring position, and the logical valve 19 is in cut-off position, the pressure reducing valve The 16 connection repairing oil sources 9, described B mouthfuls passes through the emergent decentralization pilot operated directional control valve 18, the emergent decentralization throttle valve 22 Be connected to the third check valve 29 it is A mouthfuls described, while it is described control oil sources 10 pressure oil through described C3 mouthfuls and the third The hydraulic control mouth that shuttle valve 33 enters the brake control valve 34 makes the brake control valve 34 be in control bit, the brake release Oil sources 35 is connected to the liberation port of the control mouth and the brake 6 of the balanced valve 4, by the balanced valve 4 and the brake 6 dozens It opens, the winch 7 is controllably lower under the action of hanging loading object gravity at this time will.

Although the utility model discloses as above, the utility model is not limited to this.Any those skilled in the art, It does not depart from the spirit and scope of the utility model, can make various changes or modifications, therefore the scope of protection of the utility model It should be subject to claim limited range.

Claims (5)

1. a kind of emergent overload protective device, including hydraulic pump（1）, reversal valve（2）, safety valve（3）, balanced valve（4）, hydraulic pressure horse It reaches（5）, brake（6）, winch（7）And fuel tank, the fuel tank, the hydraulic pump（1）, the reversal valve（2）With the hydraulic pressure horse It reaches（5）Form open circuit, the hydraulic pump（1）Oil outlet be equipped with safety valve（3）, the hydraulic motor（5）Described in driving Winch（7）, the hydraulic motor（5）The corresponding winch（7）The hydraulic fluid port of vertical motion is equipped with the balanced valve（4）, described Winch（7）It is equipped with the brake（6）, the winch（7）It is tied with steel wire rope and is equipped with suspender, it is characterised in that：Further include setting It sets in the hydraulic pump（1）With the reversal valve（2）Between emergent overload protection valve（8）, repairing oil sources（9）, control oil sources （10）, the second shuttle valve（32）, third shuttle valve（33）, brake control valve（34）Oil sources is discharged with brake（35）, the reversal valve（2） Two actuator ports be respectively communicated with second shuttle valve（32）Two oil inlets, second shuttle valve（32）Oil outlet connection The third shuttle valve（33）An oil inlet, the third shuttle valve（33）Oil outlet be connected to the brake control valve（34）'s Hydraulic control mouth, the balanced valve（4）Control mouth and the brake（6）Liberation port pass through the brake control valve（34）Connection institute State brake release oil sources（35）, the brake control valve（34）Spring position make the balanced valve（4）Control mouth and the brake Vehicle（6）Liberation port draining, the brake control valve（34）Control bit make the balanced valve（4）Control mouth and the brake （6）Liberation port connect brake release oil sources（35）, the emergent overload protection valve（8）Hydraulic fluid port include P mouthfuls, T mouthfuls, A Mouthful, B mouthfuls, T1 mouthfuls, C1 mouthfuls, C2 mouthfuls and C3 mouthfuls, described P mouthfuls is connected to A mouthfuls, and two logical logical valves are provided between described A mouthfuls and B mouthful （11）, the two logical logical valve（11）Hydraulic fluid port include a mouthfuls, b mouthfuls and x mouthfuls, described A mouthfuls is connected to described a mouthfuls, described B mouthfuls with The b mouthfuls of connection, described A mouthfuls and described B mouthfuls also passes through the first check valve respectively（12）It is connected to x mouthfuls described, the two logical logic Valve（11）The x mouthfuls pass through pilot operated directional control valve（13）Equipped with overload protection overflow valve（14）, the pilot operated directional control valve（13）'s Spring position makes the x mouthfuls of cut-off, the pilot operated directional control valve（13）Control bit make the x mouthfuls of connection overload protection overflow valve （14）, the emergent overload protection valve（8）The C2 mouthfuls and it is P mouthfuls described between successively be equipped with the first pilot operated directional control valve（15）、 Pressure reducing valve（16）With the second check valve（17）, first pilot operated directional control valve（15）Spring position make the pressure reducing valve（16）Enter Described T1 mouthfuls of mouth connection, first pilot operated directional control valve（15）Control bit make the pressure reducing valve（16）Entrance be connected to the C2 Mouthful, the emergent overload protection valve（8）The T mouthfuls and it is B mouthfuls described between be equipped with logical valve（19）, the logical valve（19）'s Control port passes through the second pilot operated directional control valve（20）It is connected to T1 mouthfuls described, second pilot operated directional control valve（20）Spring position make institute State logical valve（19）Control port connection it is described T1 mouthfuls, second pilot operated directional control valve（20）Control bit make the logical valve （19）Control port cut-off, the logical valve（19）When its control port ends in cut-off position, let out in its control port Also it is equipped with emergent decentralization pilot operated directional control valve when oily successively between connection position, described B mouthfuls and A mouthful（18）, emergent decentralization throttling Valve（22）With third check valve（29）, the emergent decentralization pilot operated directional control valve（18）Spring position make the emergent decentralization throttle valve （22）End with described B mouthfuls, the emergent decentralization pilot operated directional control valve（18）Control bit make described B mouthfuls by the emergent decentralization Throttle valve（22）And the third check valve（29）It is connected to described A mouthfuls, the pilot operated directional control valve（13）Hydraulic control mouth pass through Overload protection solenoid valve（28）Connect C1 mouthfuls described, the overload protection solenoid valve（28）Pilot operated directional control valve when must not be electric （13）Hydraulic control mouth connection it is described T1 mouthfuls, the overload protection solenoid valve（28）Pilot operated directional control valve when obtaining electric（13）Hydraulic control Described C1 mouthfuls of mouth connection, the overload protection solenoid valve（28）Oil outlet on be additionally provided with the first shuttle valve（30）, the overload guarantor Protect solenoid valve（28）Oil outlet be connected to first shuttle valve（30）One into having mouth, first pilot operated directional control valve（15）'s Hydraulic control mouth and second pilot operated directional control valve（20）The connection of hydraulic control mouth C3 mouthful and first shuttle valve（30）Oil outlet, The emergent decentralization pilot operated directional control valve（18）Hydraulic control mouth pass through emergent decentralization solenoid valve（31）Connect it is C1 mouthfuls described, it is described emergent Transfer solenoid valve（31）Emergent decentralization pilot operated directional control valve when must not be electric（18）Hydraulic control mouth connection it is described T1 mouthful, it is described meet an urgent need Transfer solenoid valve（31）Emergent decentralization pilot operated directional control valve when obtaining electric（18）Hydraulic control mouth connection it is described C1 mouthful, it is described meet an urgent need under Discharge magnet valve（31）Oil outlet be also connected to first shuttle valve（30）Another oil inlet, the emergent overload protection valve （8）The P mouthfuls of connection hydraulic pumps（1）Oil outlet, described T mouthfuls be connected to the fuel tank with described T1 mouthfuls, described A mouthfuls is even Lead to the reversal valve（2）Oil inlet, the B mouthfuls of connection reversal valve（2）Oil return opening, the C1 mouthfuls of connection control Oil sources（10）, the C2 mouthfuls of connection repairing oil sources（9）, the C3 mouthfuls of connection third shuttle valve（33）Another oil inlet Mouthful.

2. a kind of emergent overload protective device according to claim 1, it is characterised in that：The pilot operated directional control valve（13）For Two position and four-way reversing valves, oil inlet pass through first throttle valve（25）And second throttle（26）It is connected to described two logical logical valves （11）The x mouthfuls, the pilot operated directional control valve（13）An actuator port be equipped with the overload protection overflow valve（14）, institute State pilot operated directional control valve（13）Another actuator port cut-off.

3. a kind of emergent overload protective device according to claim 2, it is characterised in that：The two logical logical valve（11）'s Total overload protection overflow valve is additionally provided on x mouthfuls described（23）, total overload protection overflow valve（23）With it is x mouthfuls described between be equipped with The second throttle（26）.

4. a kind of emergent overload protective device according to claim 2, which is characterized in that the overload protection solenoid valve （28）Oil outlet be additionally provided with overload protection pressure sensor（24）, the overload protection pressure sensor（24）It is upper to carry pressure Show table（21）, first check valve（12）With it is x mouthfuls described between be additionally provided with third throttle valve（27）.

5. a kind of emergent overload protective device according to claim 2, which is characterized in that the brake（6）Setting is in institute State winch（7）Driving input terminal, the brake（6）With holdback, the winch（7）When vertical motion, the brake（6） It need not open, the winch（7）When lowering action, the brake（6）It needs to open.