CN110683473A - Winding control system of overhead working truck and control method thereof - Google Patents
Winding control system of overhead working truck and control method thereof Download PDFInfo
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- CN110683473A CN110683473A CN201911097858.3A CN201911097858A CN110683473A CN 110683473 A CN110683473 A CN 110683473A CN 201911097858 A CN201911097858 A CN 201911097858A CN 110683473 A CN110683473 A CN 110683473A
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- 238000004804 winding Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009434 installation Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000033001 locomotion Effects 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 62
- 239000010720 hydraulic oil Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001095 motoneuron effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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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
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- 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 hoisting control system of an overhead working truck and a control method thereof, wherein the hoisting control system comprises a hoisting control valve, an electromagnetic valve, a hoisting 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, the one-way valve and the sequence valve are connected in parallel to form a balance valve and then are connected in series between a V1 port and a C1 port, the hydraulic control reversing valve is a three-position four-way reversing valve and is connected in parallel between a V1 port, a C1 port, a V2 port and a C2 port, the electromagnetic valve is a three-position four-way electromagnetic valve and is installed between the hydraulic control reversing valve and an oil pump, the winch motor is connected with the winch control valve and a winding drum, and the brake is. The hydraulic control reversing valve is used for establishing the logical relation among the port A, the port B, the port Dr and the port K, so that the brake is efficiently and reliably regulated, the balance valve is used for balancing the hoisting load, the motion stability of the hoisting motor is ensured, and the hydraulic control reversing valve has the advantages of simple structure, flexibility in control, reliability, safety, good economy, easiness in popularization and implementation and the like.
Description
Technical Field
The invention belongs to the technical field of high-altitude operation equipment, and particularly relates to a winch control system of a high-altitude operation vehicle and a control method thereof.
Background
When the overhead working truck is used, articles are transferred to the ground by a hydraulic winch which is usually arranged on a working platform and consists of a hydraulic motor, a planetary gear, a brake, a winch control valve and the like. In the process of hoisting the hydraulic winch, the motor is under the action of pulling force applied to the motor by a hoisted object, and in order to prevent the motor from moving in an accelerating way under the action of the 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 the hydraulic hoisting and hoisting of the crane, the hoisting brake is mainly used for maintaining the crane to be free from sliding downwards. However, in the actual aloft work process, the hoisting brake is influenced by factors such as long system pipelines, large system oil return pressure and the like, and sometimes can be automatically opened in the hoisting static process to cause the hoisting weight to slide down, so that great potential safety hazards are generated.
For example, in a chinese patent with publication No. CN103803443, whose application publication date is 2014, 5/21, a crane and its hoisting brake control system are disclosed, the control system comprises a hoisting motor and a hoisting brake, the hoisting brake is communicated with a falling port of the hoisting motor and is also communicated with a braking oil inlet oil path or a braking oil discharge oil path through a directional control valve, an oil pressure sensor and a control valve are arranged on the oil inlet path of the hoisting motor, the proposal can control the opening time of the hoisting controller, avoid the secondary falling when the heavy object is hoisted, but a significant problem of the proposal is that the oil outlet of the hoisting brake is directly communicated with the drop port of the hoisting motor, so that the oil outlet pressure of the hoisting brake is influenced by the outlet pressure of the hoisting motor, when the pipeline of the system is long and the oil return pressure is increased, the oil outlet pressure of the brake is increased, so that the heavy object slides downwards due to the fact that the brake is not firmly locked.
Therefore, it is desirable to design a new hoisting control system for an aerial work platform, which can realize efficient and reliable regulation and control of a hoisting brake so as to improve the working safety of the hoisting when the hoisting is used at high altitude or in long-distance pipelines.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the winding control system of the high-altitude operation vehicle and the control method thereof, which have the advantages of simple structure, flexible control, reliability, safety and good economical efficiency.
The technical scheme adopted by the invention for solving the problems is as follows: this high altitude construction car hoist control system, including hoist control valve, solenoid valve, hoist motor, stopper and reel, its characterized in that: the winch control valve comprises a one-way valve, a sequence valve and a hydraulic control reversing valve, the one-way valve and the sequence valve are connected in parallel to form a balance valve, the balance valve is connected between V1 and C1 ports in series, and the hydraulic control reversing valve is connected between V1 and C1 ports and V2 and C2 ports in parallel; the solenoid valve is installed between hoist control valve and oil pump, the hoist motor is connected with the hoist control valve, and the U mouth and the C1 mouth of hoist motor are connected, and the D mouth and the C2 mouth of hoist motor are connected, the U mouth and the D mouth of hoist motor control respectively the hoist and rotate along opposite direction, install the stopper on the hoist motor, the stopper links to each other with the K mouth of hydraulically controlled switching-over valve to be connected with the oil tank through the Dr mouth of hydraulically controlled switching-over valve when the hydraulically controlled switching-over valve is in the meso position, the reel is connected to the hoist motor, and the reel carries out clockwise or anticlockwise rotation under the hoist motor effect. When the winch works, the hoisting weight is hoisted below the winding drum through the rope, the winding drum drives the hoisting weight to ascend or descend when rotating, the winch control valve controls the movement of the winch motor by controlling the winch brake, the winding drum is static or rotates under the action of the winch motor, the rotation direction of the winding drum can be changed by switching the working state of a hydraulic control reversing valve in the winch control valve, and the electromagnetic valve can control the on-off of an oil path or the direction of the oil path of a switching system. When the hydraulic control reversing valve is positioned at 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 locking reliability of the brake is ensured.
Preferably, the inlet of the check valve of the present invention is connected to the port V1, the outlet of the check valve is connected to the port C1, 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 check valve, and the function of preventing the hydraulic oil from flowing back is achieved; when the V1 is an oil outlet, hydraulic oil cannot flow out of the one-way valve and only can flow out of the sequence valve in the direction opposite to the 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 internally controlled sequence valve. Because the pressure of the main oil circuit is not high, the sequence valve can be selected in an internal control mode, oil is directly taken through the main oil circuit, the sequence valve plays a role of a back pressure valve when the hoisting motor performs descending operation, and pressure difference is formed at two ends of the sequence valve and used for balancing load applied by a hoisting weight, so that 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 positioned at a 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 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. When the electromagnetic valve is in the middle position, the oil inlet P is disconnected, and the hoisting motor keeps static; when the electromagnetic valve is in a first working state, hydraulic oil flows in from a U port of the hoisting motor along a port P, a port A, V1 and C1, so that the hoisting performs ascending operation; when the electromagnetic valve is in a second working state, hydraulic oil flows from a port D of the hoisting motor along ports P, B, V1 and C1, so that the hoisting machine performs 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 the first working state, the K port is connected with the V1 port, and when the hydraulic control reversing valve is in the 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 hydraulic control reversing valve and the electromagnetic valve 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 to open the brake; when the hydraulic brake is 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 aerial work platform is characterized in that: the pressure oil output from the oil pump is divided into two parts after passing through the electromagnetic valve, one part acts on the hoisting motor, and the other part acts on the brake through the hydraulic control reversing valve.
When the overhead working truck needs to perform lifting operation, the electromagnetic valve and the hydraulic control reversing valve are switched to a first working state at the same time, pressure oil enters from the port A through the electromagnetic valve, one part of the pressure oil flows into the port U of the hoisting motor through the one-way valve along the directions of V1 and C1, the port K of an oil inlet of the brake is connected with the port V1 through the hydraulic control reversing valve, the other part of the pressure oil flows into the brake, the brake is kept in a released state, the hoisting motor starts to work and drives the winding drum to rotate, and the hoisting weight hoisted on the winding drum is lifted;
when the overhead working truck needs to perform descending operation, the electromagnetic valve and the hydraulic control reversing valve are switched to a second working state at the same time, pressure oil enters from the port B through the electromagnetic valve, one part of the pressure oil flows into the port D of the hoisting motor along the directions of V2 and C2, the port K of an 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 hoisting motor starts to work and drives the winding drum to rotate reversely, and the hoisting weight hoisted on the winding drum descends;
when the overhead working truck needs to make the hoisting weight still in the air, the electromagnetic valve and the hydraulic control reversing valve are reset to a neutral position state, the oil inlet P is disconnected, the hoisting motor stops working, pressure oil at the hoisting motor reflows to the oil tank through the oil outlet T, pressure oil at the brake independently flows into the oil tank through the K port and the Dr port, the brake is closed and locks the hoisting motor, and the hoisting motor is prevented from moving under the load action of the hoisting weight.
Compared with the prior art, the invention has the following advantages and effects: according to the invention, the hydraulic control reversing valve is used for balancing the influence of the pressure of the port A and the port B on the port K, so that the pressure oil at the brake independently flows back, the use reliability and the safety of the brake are improved, the hydraulic control reversing valve and the electromagnetic valve are used for realizing the switching of the ascending and descending processes of the hoisting motor in a matching way, and the balance valve is arranged for balancing the hoisting load, so that the stable rotating speed of the hoisting motor is ensured; the system has simple structure, flexible control, good economical efficiency and easy popularization and implementation.
Drawings
In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a winch control valve according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a hydraulic hoisting structure according to an embodiment of the present invention.
Fig. 4 is a state diagram of use of an embodiment of the present invention.
Description of reference numerals: 1. a winch 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 hydraulic control directional control valve; 9. an oil tank; 10. hoisting; 11. hydraulic hoisting; 12. a working arm; 13. a manned working bucket; 14. a small boom.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 4, the winding control system of the aerial work platform of the embodiment includes a winding control valve 1, an electromagnetic valve 2, a winding motor 3, a brake 4 and a winding drum 5.
The winch control valve 1 of the embodiment comprises a check valve 6, a sequence valve 7 and a hydraulic control reversing valve 8, wherein 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 an oil path between a V1 port and a C1 port, an inlet of the check valve 6 is connected with a V1 port, an outlet of the check valve 6 is connected with a C1 port, the installation direction of the sequence valve 7 is opposite to that of the check valve 6, an inlet of the sequence valve 7 is connected with a C1 port, and an outlet of the sequence valve is connected with a V1 port. The hydraulic control reversing valve 8 is connected in parallel between the ports V1 and C1, V2 and C2, the hydraulic control reversing valve 8 is an internal control type three-position four-way reversing valve, an inlet is connected with the port V1 and the port V2, an outlet is connected with the port K and the port Dr, when the hydraulic control reversing valve 8 is in a neutral position, the port K is connected with the port Dr, when the hydraulic control reversing valve 8 is in a first working state, the port K is connected with the port V1, and when the hydraulic control reversing valve 8 is in a second working state, the port K is connected with the port V2.
Install solenoid valve 2 between the hoist control valve 1 and the oil pump of this embodiment, this solenoid valve 2 is three-position four-way solenoid valve, its entry links to each other with oil inlet P and oil-out T respectively, the export links to each other with A mouth and B mouth respectively, when solenoid valve 2 is in the meso position, oil inlet P disconnection, A mouth and B mouth link to each other with oil-out T simultaneously, when solenoid valve 2 is in first operating condition, oil inlet P links to each other with A mouth, oil-out T links to each other with B mouth, when solenoid valve 2 is in the second operating condition, oil inlet P links to each other with B mouth, oil-out T links to each other with A mouth.
The hoist motor 3 and the hoist control valve 1 of this embodiment all are located hydraulic hoist 11, the hoist control valve 1 is installed in the below of hoist motor 3, and the U mouth and the C1 mouth of hoist motor 3 are connected, the D mouth and the C2 mouth of book are connected, the U mouth and the D mouth of hoist motor 3 control the motor respectively and rotate along different directions, install the stopper 4 that is used for its motion on the hoist motor 3, stopper 4 links to each other with the K mouth of hydraulic control switching-over valve 8, rely on the hydraulic oil that flows in from the K mouth to work, stopper 4 keeps the unclamped state at the during operation, make hoist motor 3 can the free rotation, stopper 4 is in the closed condition when the stop work, with hoist motor 3 locking restriction hoist motor 3 rotation. The hoisting motor 3 is further connected with a winding drum 5, the winding drum 5 is suspended with a hoisting weight 10 through a rope, and when the winding drum 5 is driven by the hoisting motor 3 to rotate clockwise or anticlockwise, the hoisting weight 10 is driven to ascend or descend.
In the embodiment, when the lifting operation is performed, the electromagnetic valve 1 and the pilot-controlled directional valve 8 are switched to the first working state, hydraulic oil flows into the port V1 from the port a, one part of the hydraulic oil flows into the brake 4 through the port K of the pilot-controlled directional valve 8, so that the maker 4 starts to work and keeps in a release state, the other part of the hydraulic oil flows to the port C1 along the check valve 1, the port U entering the hoisting motor 3 drives the reel 5 to rotate, so that the hoisting weight 10 is lifted, and the check valve 1 is used for preventing the hydraulic oil at the port C1 from flowing back.
In the embodiment, when the descending operation is executed, the electromagnetic valve 1 and the pilot-controlled directional valve 8 are switched to the second working state, hydraulic oil flows into the port V2 from the port B, one part of the hydraulic oil flows into the brake 4 through the port K of the pilot-controlled directional valve 8, so that the maker 4 starts to work and keeps in a loose state, the other part of the hydraulic oil enters the port D of the hoisting motor 3 along the port C2 to drive the winding drum 5 to rotate reversely to lower the hoist weight 10, the hydraulic oil flowing out from the port U of the hoisting motor 3 can only flow out through the sequence valve 7 under the action of the balance valve, the sequence valve 7 can form a pressure difference at two ends of the sequence valve 7, and only when the pressure at the inlet of the sequence valve 7 exceeds a set pressure value, the hydraulic oil can flow out along the sequence valve 7, so that the load applied by the hoist weight 10 can be balanced, the hoisting motor 3 can rotate at a set speed.
In the embodiment, when the hoisting weight 10 is static in mid-air, the electromagnetic valve 2 and the hydraulic control reversing valve 8 are reset to a neutral position state, the oil inlet P is disconnected, the hoisting motor 3 stops working, pressure oil at the hoisting motor 3 reflows 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 hoisting motor 3, the hoisting motor 3 is prevented from moving under the load action of the hoisting weight 10, the pressure oil at the brake 4 independently reflows to the oil tank 9 without reflowing through the oil outlet T, the purpose is to enable the oil outlet pressure of the brake 4 not to be influenced by the pressures of the A port and the B port, the locking reliability of the brake 4 is ensured, and the safety of a control system is improved.
The hoist control system of the embodiment is generally used for simplifying the process of transferring articles between the manned working bucket 13 of the aerial work platform and the ground, specifically, the hydraulic hoist 11 is installed at the connecting position of the working arm 12 of the aerial work platform and the manned working bucket 13 and is connected with the small suspension arm 14, the winding drum 5 is located at the front end of the small suspension arm 14, when in use, the articles are hoisted on the small suspension arm 14, and an operator controls the hydraulic hoist 11 through an operation platform located on the manned working bucket 13, so that the small suspension arm 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 be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The utility model provides an aerial working car 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 between ports V1 and C1 in series, and the hydraulic control reversing valve (8) is connected between ports V1 and C1 and ports V2 and C2 in parallel; the electromagnetic valve (2) is installed between a winch control valve (1) and an 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 in opposite directions, a brake (4) is installed on the winch motor (3), the brake (4) is connected with a K port of a hydraulic control reversing valve (8), and the Dr port of the hydraulic control reversing valve (8) is connected with an oil tank (9) when the hydraulic control reversing valve (8) is located at a middle position, the winch motor (3) is connected with a winding drum (5), and the winding drum (5) rotates clockwise or anticlockwise under the action of the winch motor (3).
2. The aerial cage hoisting control system of claim 1, wherein: the inlet of the check valve (6) is connected with the port V1, the outlet of the check valve (6) is connected with the port C1, and the installation direction of the sequence valve (7) is opposite to that of the check valve (6).
3. The aerial cage hoisting control system of claim 1, wherein: the sequence valve (7) is an internal control type sequence valve.
4. The aerial cage hoisting control system of claim 1, wherein: the electromagnetic valve (2) is a three-position four-way electromagnetic valve, when the electromagnetic valve (2) is positioned at a middle position, the oil inlet P is disconnected, when the electromagnetic valve (2) is positioned at 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 positioned at 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.
5. The aerial cage hoisting control system of claim 1, wherein: the hydraulic control reversing valve (8) is an internal control type 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.
6. A control method for the aerial lift truck winch control system as defined in any one of claims 1 to 5, wherein: 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 hoisting 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 perform lifting operation, the electromagnetic valve (2) and the hydraulic control reversing valve (8) are switched to a first working state at the same time, pressure oil enters from the port A through the electromagnetic valve (2), one part of the pressure oil flows into the port U of the hoisting motor (3) through the one-way valve (6) along the directions of V1 and C1, the port K of an oil inlet of the brake (4) is connected with the port V1 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 hoisting motor (3) starts to work and drives the winding drum (5) to rotate, and the hoisting weight (10) hoisted on the winding drum (5) rises;
when the overhead working truck needs to perform descending operation, the electromagnetic valve (2) and the hydraulic control reversing valve (8) are switched to a second working state at the same time, 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 hoisting motor (3) along the directions of V2 and C2, the port K of an oil inlet of the brake (4) is connected with the port V2 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 release state, the hoisting motor (3) starts to work and drives the winding drum (5) to rotate reversely, and the hoisting weight (10) hoisted on the winding drum (5) descends;
when the overhead working truck needs to enable the hoisting weight (10) to be static in the midair, the electromagnetic valve (2) and the hydraulic control reversing valve (8) are reset to a neutral position state, the oil inlet P is disconnected, the hoisting motor (3) stops working, pressure oil at the hoisting motor (3) flows back to the oil tank through the oil outlet T, pressure oil at the brake (4) flows into the oil tank (9) through the K port and the Dr port independently, the brake (4) is closed and locks the hoisting motor (3), and the hoisting motor (3) is prevented from moving under the load action of the hoisting weight (10).
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| Application Number | Priority Date | Filing Date | Title |
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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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115676662A (en) * | 2022-11-22 | 2023-02-03 | 大连海事大学 | Electrohydraulic servo integrated hoister |
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| CN101734565A (en) * | 2008-11-25 | 2010-06-16 | 徐州重型机械有限公司 | Crane and winch control system thereof |
| CN105217508A (en) * | 2014-10-30 | 2016-01-06 | 徐州重型机械有限公司 | A kind of hoist brake control system, method and hoisting 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 |
| CN109896461A (en) * | 2019-03-29 | 2019-06-18 | 北京航天发射技术研究所 | A kind of high reliability and safety big load hoist braking system and method |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115676662A (en) * | 2022-11-22 | 2023-02-03 | 大连海事大学 | Electrohydraulic servo integrated hoister |
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