CN110683473B - Hoisting control system and control method for overhead working truck - Google Patents
Hoisting control system and control method for overhead working truck Download PDFInfo
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- CN110683473B CN110683473B CN201911097858.3A CN201911097858A CN110683473B CN 110683473 B CN110683473 B CN 110683473B CN 201911097858 A CN201911097858 A CN 201911097858A CN 110683473 B CN110683473 B CN 110683473B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 36
- 230000009471 action Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 68
- 239000010720 hydraulic oil Substances 0.000 description 17
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
- B66D1/42—Control devices non-automatic
- B66D1/44—Control devices non-automatic pneumatic of hydraulic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/24—Operating devices
- B66D5/26—Operating devices pneumatic or hydraulic
- B66D5/28—Operating devices pneumatic or hydraulic specially adapted for winding gear, e.g. in mining hoists
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D2700/00—Capstans, winches or hoists
- B66D2700/03—Mechanisms with latches or braking devices in general for capstans, hoists or similar devices as well as braking devices actuated electrically or by fluid under pressure
- B66D2700/035—Fluid operated braking devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Control And Safety Of Cranes (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a control system and a control method for a winch of an overhead working truck, which comprises a winch control valve, an electromagnetic valve, a winch motor, a brake and a winding drum, and is characterized in that: the winch control valve comprises a one-way valve, a sequence valve and a hydraulic control reversing valve, wherein the one-way valve and the sequence valve are connected in parallel to form a balance valve and then are connected between a V1 port and a C1 port in series, the hydraulic control reversing valve is a three-position four-way reversing valve and is connected between the V1 port, the C1 port, the V2 port and the C2 port in parallel, the electromagnetic valve is a three-position four-way electromagnetic valve and is arranged between the hydraulic control reversing valve and the oil pump, the winch motor is connected with the winch control valve and the winding drum, and the brake is arranged on the winch motor. The invention establishes the logic relation among the port A, the port B, the port Dr and the port K by utilizing the hydraulic control reversing valve, realizes the efficient and reliable regulation and control of the brake, balances the heavy load by utilizing the balance valve, ensures the motion stability of the hoisting motor, and has the advantages of simple structure, flexible control, reliability and safety, good economy, easy popularization and implementation and the like.
Description
Technical Field
The invention belongs to the technical field of overhead working equipment, and particularly relates to a hoisting control system and a control method for an overhead working truck, which are mainly used for the overhead working truck.
Background
When the overhead working truck is used, a hydraulic winch on a working platform is commonly used for transmitting objects with the ground, and the hydraulic winch is commonly composed of a hydraulic motor, a planetary gear, a brake, a winch control valve and the like. In the hydraulic winch lifting process, the motor can be subjected to the action of pulling force exerted on the lifted object, and in order to prevent the motor from accelerating under the action of pulling force, a balance valve is usually arranged in a hydraulic system to maintain the pressure stability in the hydraulic system and balance the pulling force; in the process of resting the hydraulic winch hoisting weight, the hoisting weight is maintained not to slide downwards mainly by a winch brake. However, in the actual high-altitude operation process, the hoisting brake is affected by factors such as long system pipelines, high system oil return pressure and the like, and the hoisting brake can be automatically opened in the hoisting static process to cause the hoisting to slide downwards, so that great potential safety hazards are generated.
For example, in a chinese patent with publication number CN103803443 and publication number CN103803443, the control system of crane and winch is disclosed, the control system includes winch motor and winch brake, the winch brake is communicated with the drop port of winch motor, and is also communicated with brake oil inlet oil path or brake oil discharge oil path through directional control valve, and is equipped with oil pressure sensor and control valve on the oil inlet path of winch motor, the scheme can control the opening time of winch controller, avoid secondary drop when lifting heavy object, but a significant problem of this scheme is that the oil outlet of winch brake is directly communicated with drop port of winch motor, and the oil outlet pressure of winch brake is affected by outlet pressure of winch motor, when the pipeline of system is longer, when the oil return pressure is increased, the oil outlet pressure of winch is raised, and the locking is not firm, resulting in falling heavy object.
Therefore, it is desirable to design a new overhead working truck winch control system, which can realize efficient and reliable regulation and control of a winch brake so as to improve the working safety of the winch in use of high-altitude or long-distance pipelines.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the overhead working truck winch control system and the control method thereof, which have the advantages of simple structure, flexible control, reliability, safety and good economy.
The invention solves the problems by adopting the following technical scheme: the overhead working truck winch control system comprises a winch control valve, an electromagnetic valve, a winch motor, a brake and a winding drum, and is characterized in that: the winch control valve comprises a one-way valve, a sequence valve and a hydraulic control reversing valve, wherein the one-way valve and the sequence valve are connected in parallel to form a balance valve, the balance valve is connected in series between the V1 port and the C1 port, and the hydraulic control reversing valve is connected in parallel between the V1 port and the C1 port and between the V2 port and the C2 port; the electromagnetic valve is arranged between the winch control valve and the oil pump, the winch motor is connected with the winch control valve, the U port of the winch motor is connected with the C1 port, the D port of the winch motor is connected with the C2 port, the U port and the D port of the winch motor respectively control the winch to rotate along opposite directions, a brake is arranged on the winch motor, the brake is connected with the K port of the hydraulic control reversing valve, and the hydraulic control reversing valve is connected with the oil tank through the Dr port of the hydraulic control reversing valve when the hydraulic control reversing valve is in the middle position, the winch motor is connected with the winding drum, and the winding drum rotates clockwise or anticlockwise under the action of the winch motor. When the winch works, the hoisting weight is hoisted below the winding drum through the rope, the hoisting weight is driven to ascend or descend when the winding drum rotates, the winch control valve controls the movement of the winch motor through controlling the winch brake, the winding drum is enabled to be static or rotate under the action of the winch motor, the change of the rotating direction of the winding drum can be realized by switching the working state of the hydraulic control reversing valve in the winch control valve, and the electromagnetic valve can control the on-off of an oil way or the direction of the oil way of a switching system. When the hydraulic control reversing valve is in the middle position, the brake is connected with the oil tank through the K port and the Dr port, and control oil in the brake directly flows back to the oil tank, so that the brake is ensured to be locked reliably.
Preferably, the inlet of the check valve is connected with the V1 port, the outlet of the check valve is connected with the C1 port, and the installation direction of the sequence valve is opposite to the installation direction of the check valve. When the V1 port is an oil inlet, hydraulic oil can only be introduced into the C1 port along the one-way valve, and the effect of preventing the hydraulic oil from flowing back is achieved; when V1 is an oil outlet, hydraulic oil cannot flow out from the one-way valve, and can only flow out through the sequence valve with the reverse installation direction of the one-way valve after the pressure exceeds the set pressure value of the sequence valve.
Preferably, the sequence valve of the present invention is an internal control sequence valve. Because the pressure of the main oil way is not high, the sequence valve can be internally controlled, oil is directly taken out through the main oil way, the sequence valve plays a role of a back pressure valve when the winch motor executes descending operation, pressure difference is formed at two ends of the sequence valve, the pressure difference is used for balancing load applied by the crane, the motor rotates at a set speed, and the descending speed is controlled.
Preferably, the electromagnetic valve is a three-position four-way electromagnetic valve, and when the electromagnetic valve is in the middle position, the oil inlet P is disconnected; when the electromagnetic valve is in a first working state, the oil inlet P is connected with the port A, and the oil outlet T is connected with the port B; when the electromagnetic valve is in the second working state, the oil inlet P is connected with the port B, and the oil outlet T is connected with the port A. When the electromagnetic valve is in the middle position, the oil inlet P is disconnected, and the winch motor is kept static; when the electromagnetic valve is in a first working state, hydraulic oil flows in from the U-shaped opening of the winch motor along the P-shaped opening, the A-shaped opening, the V1 and the C1, so that the winch executes lifting operation; when the electromagnetic valve is in the second working state, hydraulic oil flows in from the port D of the winch motor along the port P, the port B, the port V1 and the port C1, so that the winch executes descending operation.
Preferably, the hydraulic control reversing valve is an internal control type three-position four-way reversing valve, when the hydraulic control reversing valve is in a first working state, the K port is connected with the V1 port, and when the hydraulic control reversing valve is in a second working state, the K port is connected with the V2 port. The first working state and the second working state of the hydraulic control reversing valve correspond to the first working state and the second working state of the electromagnetic valve, and when the first working state and the second working state are both in the first working state, hydraulic oil flows into the brake from the V1 port through the hydraulic control reversing valve and the K port, so that the brake is opened; when both are in the second working state, hydraulic oil flows into the brake from the V2 port through the hydraulic control reversing valve and the K port, and the brake is opened.
A control method of a hoisting control system of an overhead working truck is characterized by comprising the following steps of: the pressure oil output from the oil pump is divided into two parts after passing through the electromagnetic valve, one part acts on the winch motor, and the other part acts on the brake through the hydraulic control reversing valve.
When the high-altitude operation vehicle needs to execute ascending operation, the electromagnetic valve and the hydraulic control reversing valve are simultaneously switched to a first working state, at the moment, pressure oil enters from an A port through the electromagnetic valve, one part of the pressure oil flows into a U port of a winding motor along the V1 and C1 directions through the one-way valve, meanwhile, an oil inlet K port of a brake is connected with the V1 port through the hydraulic control reversing valve, the other part of the pressure oil flows into the brake, the brake is kept in a loosening state, the winding motor starts to work and drives a winding drum to rotate, and a hoisting weight hoisted on the winding drum ascends;
When the high-altitude operation vehicle needs to execute descending operation, the electromagnetic valve and the hydraulic control reversing valve are simultaneously switched to a second working state, at the moment, pressure oil enters from the port B through the electromagnetic valve, one part of the pressure oil flows into the port D of the winding motor along the directions V2 and C2, meanwhile, the port K of the oil inlet of the brake is connected with the port V2 through the hydraulic control reversing valve, the other part of the pressure oil flows into the brake, the brake is kept in a loosening state, the winding motor starts to work and drives the winding drum to reversely rotate, and the hoisting weight hoisted on the winding drum descends;
When the overhead working truck needs to rest the crane in mid-air, the electromagnetic valve and the hydraulic control reversing valve are reset to a neutral state, the oil inlet P is disconnected, the winch motor stops working, pressure oil at the winch motor flows back to the oil tank through the oil outlet T, the pressure oil at the brake independently flows into the oil tank through the K port and the Dr port, the brake is closed, the winch motor is locked, and the winch motor is prevented from moving under the load action of the crane.
Compared with the prior art, the invention has the following advantages and effects: according to the hydraulic control reversing valve, the influence of the pressure of the opening A and the pressure of the opening B on the opening K is balanced by the hydraulic control reversing valve, so that pressure oil at a brake is independently refluxed, the use reliability and the safety of the brake are improved, the lifting and descending process switching of a winch motor is realized by the cooperation of the hydraulic control reversing valve and an electromagnetic valve, the balance valve is arranged to balance the heavy load of the crane, and the rotating speed stability of the winch motor is ensured; the system has the advantages of simple structure, flexible control, good economy and easy popularization and implementation.
Drawings
In order to more clearly illustrate the embodiments of the invention or the solutions in the prior art, a brief description will be given below of the drawings that are needed in the description of the embodiments or the prior art, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a winch control valve according to an embodiment of the present invention.
Fig. 3 is a schematic view of a hydraulic hoisting structure according to an embodiment of the present invention.
Fig. 4 is a use state diagram of an embodiment of the present invention.
Reference numerals illustrate: 1. a hoisting control valve; 2. an electromagnetic valve; 3. a hoist motor; 4. a brake; 5. a reel; 6. a one-way valve; 7. a sequence valve; 8. a hydraulically controlled reversing valve; 9. an oil tank; 10. hanging the weight; 11. hydraulic hoisting; 12. a working arm; 13. a manned working bucket; 14. and a small suspension arm.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1 to 4, the hoist control system of the overhead working truck of the present embodiment includes a hoist control valve 1, an electromagnetic valve 2, a hoist motor 3, a brake 4, and a spool 5.
The winch control valve 1 of this embodiment includes a check valve 6, a sequence valve 7 and a pilot operated directional valve 8, the check valve 6 and the sequence valve 7 are connected in parallel to form a balance valve, the balance valve is connected in series on the oil path between the port V1 and the port C1, the inlet of the check valve 6 is connected with the port V1, the outlet is connected with the port C1, the installation direction of the sequence valve 7 is opposite to the installation direction of the check valve 6, the inlet of the sequence valve 7 is connected with the port C1, and the outlet is connected with the port V1, since the pressure of the main oil path is not high, the sequence valve 7 can select internal control type to directly take oil through the main oil path. The hydraulic control reversing valve 8 is connected between the V1, C1, V2 and C2 ports in parallel, the hydraulic control reversing valve 8 is an internal control three-position four-way reversing valve, an inlet is connected with the V1 port and the V2 port, an outlet is connected with the K port and the Dr port, when the hydraulic control reversing valve 8 is in a neutral position, the K port is connected with the Dr port, when the hydraulic control reversing valve 8 is in a first working state, the K port is connected with the V1 port, and when the hydraulic control reversing valve 8 is in a second working state, the K port is connected with the V2 port.
The electromagnetic valve 2 is installed between the winch control valve 1 and the oil pump in the embodiment, the electromagnetic valve 2 is a three-position four-way electromagnetic valve, the inlet of the electromagnetic valve 2 is connected with the oil inlet P and the oil outlet T respectively, the outlet of the electromagnetic valve is connected with the port A and the port B respectively, when the electromagnetic valve 2 is in the middle position, the oil inlet P is disconnected, the port A and the port B are simultaneously connected with the oil outlet T, when the electromagnetic valve 2 is in the first working state, the oil inlet P is connected with the port A, the oil outlet T is connected with the port B, and when the electromagnetic valve 2 is in the second working state, the oil inlet P is connected with the port B, and the oil outlet T is connected with the port A.
The winch motor 3 and the winch control valve 1 of the embodiment are both positioned in the hydraulic winch 11, the winch control valve 1 is installed below the winch motor 3, the U port of the winch motor 3 is connected with the C1 port, the D port of the coil is connected with the C2 port, the U port and the D port of the winch motor 3 respectively control the motors to rotate in different directions, the winch motor 3 is provided with a brake 4 for movement, the brake 4 is connected with the K port of the hydraulic reversing valve 8, the winch motor 3 works by means of hydraulic oil flowing from the K port, the brake 4 keeps a loosening state during working, the winch motor 3 can rotate freely, and the brake 4 is in a closing state during stopping working, so that the winch motor 3 is locked and limited to rotate. The winding motor 3 is also connected with a winding drum 5, the winding drum 5 is suspended with a hanging weight 10 through a rope, and when the winding drum 5 rotates clockwise or anticlockwise under the drive of the winding motor 3, the hanging weight 10 is driven to ascend or descend.
When the lifting operation is executed, the electromagnetic valve 1 and the hydraulic control reversing valve 8 are switched to a first working state, hydraulic oil flows into the V1 port from the A port, one part of the hydraulic oil flows into the brake 4 through the K port of the hydraulic control reversing valve 8, so that the maker 4 starts working and keeps a loosening state, the other part of the hydraulic oil flows to the C1 port along the one-way valve 1, the U port entering the winding motor 3 drives the winding drum 5 to rotate to lift the lifting weight 10, and the one-way valve 1 is used for preventing the hydraulic oil at the C1 port from flowing back.
In this embodiment, when the lowering operation is performed, the solenoid valve 1 and the pilot operated directional valve 8 are switched to the second working state, hydraulic oil flows into the V2 port from the B port, a part of hydraulic oil flows into the brake 4 through the K port of the pilot operated directional valve 8, so that the maker 4 starts working and keeps the releasing state, another part of hydraulic oil enters the D port of the hoist motor 3 along the C2 port, drives the winding drum 5 to reversely rotate to lower the hoist 10, hydraulic oil flowing out of the U port of the hoist motor 3 only flows out through the sequence valve 7 under the action of the balance valve, the pressure difference can be formed at two ends of the sequence valve 7, and the hydraulic oil flows out along the sequence valve 7 only after the pressure at the inlet of the sequence valve 7 exceeds the set pressure value, so that the load applied by the hoist 10 can be balanced, the hoist motor 3 rotates at the set speed, and the lowering speed of the hoist 10 is controlled.
In the embodiment, when the crane 10 is stationary in mid-air, the electromagnetic valve 2 and the hydraulic control reversing valve 8 are reset to a neutral state, the oil inlet P is disconnected, the winch motor 3 stops working, pressure oil at the winch motor 3 flows back to the oil tank through the oil outlet T, pressure oil at the brake 4 independently flows into the oil tank 9 through the K port and the Dr port of the hydraulic control reversing valve 8, the brake 4 is closed and locks the winch motor 3, the winch motor 3 is prevented from moving under the load action of the crane 10, the pressure oil at the brake 4 independently flows back to the oil tank 9 and does not flow back through the oil outlet T, and the aim is to ensure the locking reliability of the brake 4 and improve the safety of a control system.
The winch control system of this embodiment is generally used to simplify the process of transferring articles between the manned working bucket 13 of the overhead working truck and the ground, specifically, the hydraulic winch 11 is installed at the connection position between the working arm 12 and the manned working bucket 13 of the overhead working truck and is connected to the small boom 14, the winding drum 5 is located at the front end of the small boom 14, when in use, the articles are suspended on the small boom 14, and the operator controls the hydraulic winch 11 through the operation console located on the manned working bucket 13, so that the small boom 14 performs operations such as rotation, lifting and the like.
In addition, it should be noted that the specific embodiments described in the present specification may vary from part to part, from name to name, etc., and the above description in the present specification is merely illustrative of the structure of the present invention. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present patent. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (4)
1. The utility model provides an aerial working truck hoist control system, includes hoist control valve (1), solenoid valve (2), hoist motor (3), stopper (4) and reel (5), its characterized in that: the winch control valve (1) comprises a one-way valve (6), a sequence valve (7) and a hydraulic control reversing valve (8), wherein the one-way valve (6) and the sequence valve (7) are connected in parallel to form a balance valve, the balance valve is connected in series between the V1 port and the C1 port, and the hydraulic control reversing valve (8) is connected in parallel between the V1 port and the C1 port and between the V2 port and the C2 port; the electromagnetic valve (2) is arranged between the winch control valve (1) and the oil pump, the winch motor (3) is connected with the winch control valve (1), a U port of the winch motor (3) is connected with a C1 port, a D port of the winch motor (3) is connected with a C2 port, the U port and the D port of the winch motor (3) respectively control the winch to rotate along opposite directions, a brake (4) is arranged on the winch motor (3), the brake (4) is connected with a K port of the hydraulic control reversing valve (8), and is connected with the oil tank (9) through a Dr port of the hydraulic control reversing valve (8) when the hydraulic control reversing valve (8) is in a neutral position, the winch motor (3) is connected with the winding drum (5), and the winding drum (5) rotates clockwise or anticlockwise under the action of the winch motor (3); the inlet of the one-way valve (6) is connected with the V1 port, the outlet of the one-way valve (6) is connected with the C1 port, and the installation direction of the sequence valve (7) is opposite to the installation direction of the one-way valve (6); the hydraulic control reversing valve (8) is an internal control three-position four-way reversing valve, when the hydraulic control reversing valve (8) is in a first working state, the K port is connected with the V1 port, and when the hydraulic control reversing valve (8) is in a second working state, the K port is connected with the V2 port.
2. The overhead working truck hoist control system of claim 1, characterized in that: the sequence valve (7) is an internal control sequence valve.
3. The overhead working truck hoist control system of claim 1, characterized in that: the electromagnetic valve (2) is a three-position four-way electromagnetic valve, when the electromagnetic valve (2) is in a middle position, the oil inlet P is disconnected, when the electromagnetic valve (2) is in a first working state, the oil inlet P is connected with the port A, the oil outlet T is connected with the port B, when the electromagnetic valve (2) is in a second working state, the oil inlet P is connected with the port B, and the oil outlet T is connected with the port A.
4. A control method of a hoist control system of an overhead working truck according to any one of claims 1 to 3, characterized by: the pressure oil output from the oil pump is divided into two parts after passing through the electromagnetic valve (2), one part acts on the winch motor (3), and the other part acts on the brake (4) through the hydraulic control reversing valve (8);
When the high-altitude operation vehicle needs to execute ascending operation, the electromagnetic valve (2) and the hydraulic control reversing valve (8) are simultaneously switched to a first working state, at the moment, pressure oil enters from an A port through the electromagnetic valve (2), one part of the pressure oil flows into a U port of the winding motor (3) along the V1 and C1 directions through the one-way valve (6), meanwhile, an oil inlet K port of the brake (4) is connected with the V1 port through the hydraulic control reversing valve (8), the other part of the pressure oil flows into the brake (4), the brake (4) is kept in a loosening state, the winding motor (3) starts to work and drives the winding drum (5) to rotate, and a hoisting weight (10) hoisted on the winding drum (5) is ascended;
When the high-altitude operation vehicle needs to execute descending operation, the electromagnetic valve (2) and the hydraulic control reversing valve (8) are simultaneously switched to a second working state, at the moment, pressure oil enters from the port B through the electromagnetic valve (2), one part of the pressure oil flows into the port D of the winding motor (3) along the directions V2 and C2, meanwhile, the port K of the oil inlet of the brake (4) is connected with the port V2 through the hydraulic control reversing valve (8), so that the other part of the pressure oil flows into the brake (4), the brake (4) is kept in a released state, the winding motor (3) starts to work and drives the winding drum (5) to reversely rotate, and the lifting weight (10) lifted on the winding drum (5) is lowered;
When the overhead working truck needs to be static in mid-air, the electromagnetic valve (2) and the hydraulic control reversing valve (8) are reset to a neutral state, the oil inlet P is disconnected, the winch motor (3) stops working, pressure oil at the winch motor (3) flows back to the oil tank through the oil outlet T, the pressure oil at the brake (4) independently flows into the oil tank (9) through the K port and the Dr port, the brake (4) is closed and locks the winch motor (3), and the winch motor (3) is prevented from moving under the load action of the overhead working truck (10).
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| CN201911097858.3A CN110683473B (en) | 2019-11-12 | 2019-11-12 | Hoisting control system and control method for overhead working truck |
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| CN201911097858.3A CN110683473B (en) | 2019-11-12 | 2019-11-12 | Hoisting control system and control method for overhead working truck |
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| CN211198430U (en) * | 2019-11-12 | 2020-08-07 | 杭州爱知工程车辆有限公司 | Winding control system of overhead working truck |
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| CN2892805Y (en) * | 2006-04-29 | 2007-04-25 | 徐州重型机械有限公司 | Motor rotational speed memory hoisting braker control device |
| JP4737114B2 (en) * | 2007-02-26 | 2011-07-27 | コベルコクレーン株式会社 | Hydraulic winch control device |
| CN101734565B (en) * | 2008-11-25 | 2011-04-06 | 徐州重型机械有限公司 | Crane and winch control system thereof |
| CN105217508B (en) * | 2014-10-30 | 2017-09-19 | 徐州重型机械有限公司 | A kind of hoist brake control system, method and crane |
| CN205895725U (en) * | 2016-07-28 | 2017-01-18 | 都兰金辉矿业有限公司 | Haulage gear hydraulic control system for gold mine |
| CN109896461B (en) * | 2019-03-29 | 2020-07-14 | 北京航天发射技术研究所 | High-reliability and high-safety large-load hoister braking system and method |
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| CN211198430U (en) * | 2019-11-12 | 2020-08-07 | 杭州爱知工程车辆有限公司 | Winding control system of overhead working truck |
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