CN112855637B - High-reliability hydraulic rigid synchronization system and working method thereof - Google Patents
High-reliability hydraulic rigid synchronization system and working method thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
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Abstract
The invention discloses a high-reliability hydraulic rigid synchronization system and a working method thereof, wherein the system comprises an electromagnetic directional valve, a balance valve, N hydraulic control one-way valves, N overflow valves and N oil cylinders, an A port of the electromagnetic directional valve is communicated with a pilot port of the balance valve, a pilot port of each hydraulic control one-way valve and a rod cavity of each oil cylinder, a B port of the electromagnetic directional valve is communicated with an oil inlet of the balance valve, a load port of the balance valve is communicated with an oil inlet of each hydraulic control one-way valve, a load port of each hydraulic control one-way valve is communicated with a rodless cavity of the corresponding oil cylinder, an oil inlet of each overflow valve is communicated with a load port of the corresponding hydraulic control one-way valve and a rodless cavity of the corresponding oil cylinder, a pressure sensor is arranged between an oil inlet of the N hydraulic control one-way valves and the load port of the balance valve, and N is more than or equal to 2. The invention realizes rigid synchronization of a plurality of oil cylinders by using a conventional hydraulic element, has high synchronization precision and high safety, is not influenced by environmental temperature change, considers two working modes of large flow of the electric pump and small flow of the manual pump and has high integral reliability.
Description
Technical Field
The invention belongs to the technical field of hydraulic pressure, and particularly relates to a high-reliability hydraulic rigid synchronization system and a working method thereof.
Background
In some hydraulic lifting and lodging mechanisms of large heavy-duty equipment, two cylinders or multiple cylinders are adopted for driving simultaneously in order to realize larger thrust. Two cylinders or multiple cylinders need synchronous action to ensure that the mechanism can stably and safely operate. Meanwhile, in many fields, particularly military fields, hard requirements are placed on the environmental temperature adaptability of equipment and the manual emergency operation function under the condition of power loss, and a hydraulic system still needs to ensure good synchronization precision under the conditions.
Synchronous control in the prior hydraulic technology generally adopts synchronous motor synchronization, proportional speed regulating valve and position sensor closed-loop control synchronization and rigid synchronization.
Synchronous motors synchronously utilize equal output flow of all output ports of the motors to realize synchronization, the price of the synchronous motors is high, and due to mechanical manufacturing errors, internal leakage and the like, inherent errors exist in the output flow among all the output ports of the synchronous motors, and the errors are accumulated, so that the synchronization errors are overlarge finally. Meanwhile, the flow of the inlet of the synchronous motor has a limited range, and the flow of the manual pump is far lower than that of the electric pump, so that the limited range of the flow of the inlet of the synchronous motor cannot cover the flow of the electric pump and the flow of the manual pump, so that the synchronous precision is greatly reduced during manual emergency operation, and the risk of damaging equipment is caused.
The proportional speed regulating valve is in closed-loop control synchronization with the position sensor, the position sensor is installed on each oil cylinder, and the proportional speed regulating valve is used for independently controlling the speed of each oil cylinder, so that the displacement of each oil cylinder is the same, and synchronization is guaranteed. The method has high synchronization precision, but increases the number of valves and sensors, and has higher cost and lower reliability. And under the condition of power loss, the proportional speed regulating valve and the sensor cannot work, and manual emergency operation cannot be carried out.
The rigid synchronization utilizes a rigid mechanism to rigidly connect two or more oil cylinders with oil passages connected in parallel, and the flow is not actively controlled. When two or more oil cylinder pistons are in a stress balance state, the oil cylinder pistons perform uniform linear motion, and the oil cylinders act synchronously. When any one oil cylinder piston is unbalanced in stress to generate acceleration, the oil cylinders start to move asynchronously, the rigid connecting mechanism between the oil cylinders is elastically deformed, the elastic stress generated along with the elastic deformation enables the oil cylinder piston to be balanced in stress, and the oil cylinders restore to move synchronously. The rigid synchronization structure is simple, the precision is high, the cost is low, and the flow size has no influence on the synchronization precision.
Under the condition that the elastic stress required by the stress balance of the oil cylinder piston of the rigid synchronous mechanism is certain, the higher the rigidity of the mechanism is, the smaller the elastic deformation amount is, and the higher the synchronous precision is. Because self weight is great, in order to prevent that equipment from warping and improving stability, the overall rigidity is very high in the design, in order to satisfy the requirement that can manual emergency operation, is fit for adopting the rigidity synchronization mode simultaneously. The smaller the stress difference between two or more oil cylinder pistons of the rigid synchronization mechanism is, the smaller the elastic stress required by stress balance is, the smaller the elastic deformation of the mechanism is, and the higher the synchronization precision is. In order to minimize the stress difference between two or more oil cylinder pistons, the rigid synchronization generally adopts an equal-load and equal-pressure design. The load of the equipment is uniformly distributed on the structure, and the oil cylinders are uniformly distributed relative to the load, so that the load force acting on the piston of each oil cylinder is equal. The hydraulic schematic diagram of the existing hydraulic rigid synchronous system is shown in fig. 1, two oil cylinders have the same specification, oil paths are connected in parallel, rod cavities are communicated with each other, a rodless cavity is a bearing cavity, two oil cylinder rodless cavities are respectively provided with a balance valve as a safety and speed control valve, and the rodless cavities are communicated with each other after passing through the balance valves. When the lifting mechanism is lifted, the oil cylinders extend out, the oil passages of the rodless cavities are pressurized, the balance valves are opened in the positive direction, the opening pressure is very low, the pressure loss and the difference caused by the pressure loss can be ignored, the pressure of the rodless cavities of the two cylinders is equal, and the thrust of the rodless cavities is equal. When the device is laid down, the oil cylinders retract, the oil passages with rod cavities pressurize, the rod cavities of the two cylinders are communicated with each other, the pressure is equal, and the thrust of the rod cavities is equal. When the equipment is lodged, the balance valves are reversely opened to form balance pressure in the rodless cavity, the set values of the balance pressures of the two cylinder balance valves are the same, the balance pressure acts on the piston to form balance force, the balance force is generally at least 1.3 times of the load force, and the stall of the equipment is prevented from playing a role in speed control; when the oil cylinder stops at any position or the oil pipe bursts, the balance valve is closed, so that the oil cylinder stops at the current position and does not fall down to ensure safety. The main stress of the oil cylinder piston during lifting is rodless cavity thrust and load force, the rodless cavity thrust and the load force borne by the two cylinder pistons are equal, the two cylinder pistons are stressed differently due to the influence of factors such as load deviation and friction force, but the stress difference caused by the load deviation and the friction force is smaller, the mechanism only needs micro elastic deformation, the generated elastic stress can balance the stress of the two cylinder pistons, and the synchronization precision is high. When the piston is laid down, the oil cylinder piston is mainly stressed by the rod cavity thrust, the loading force and the balance force, the rod cavity thrust, the loading force and the balance force of the two cylinder pistons are equal, and the two cylinder pistons are stressed differently due to the influence of factors such as loading deviation, balance force error and friction force. The stress difference caused by the load deviation and the friction force is small, the proportion of the balance force in the stress of the oil cylinder piston is large, and the stress difference caused by the balance force error is relatively large. Compared with lifting, the mechanism needs to generate larger elastic deformation when lodging, the generated elastic stress can enable the two cylinder pistons to be stressed in balance, synchronization can be ensured, but the precision is relatively low in lifting. The hydraulic system is provided with a multi-stage filter, but impurities inevitably exist in hydraulic oil after long-term operation. The spring valve core mechanism is arranged in the balance valve, the spring valve core mechanism is relatively precise and is easily influenced by impurities, the balance force is greatly changed, the stress difference of the two cylinder pistons is increased when the balance valve is laid down, the elastic stress required by stress balance is increased, and the elastic deformation of the mechanism is increased. According to practical engineering experience, when the balance force applied to the two-cylinder piston is influenced by impurities to generate difference, the situation that the elastic stress still cannot balance the stress of the two-cylinder piston after the mechanism reaches the elastic deformation limit easily occurs, the mechanism is continuously deformed until plastic deformation or even breakage occurs, and permanent damage to equipment is caused.
Disclosure of Invention
In order to solve the problems, the invention provides a high-reliability hydraulic rigid synchronization system and a working method thereof.
The technical solution for achieving the above purpose is as follows:
a high-reliability hydraulic rigid synchronization system comprises an electromagnetic directional valve, a balance valve, N hydraulic control one-way valves, N overflow valves and N oil cylinders.
The port A of the electromagnetic reversing valve is communicated with a pilot port of the balance valve, a pilot port of each hydraulic control one-way valve and a rod cavity of each oil cylinder, the port B of the electromagnetic reversing valve is communicated with an oil inlet of the balance valve, a load port of the balance valve is communicated with an oil inlet of each hydraulic control one-way valve, a load port of each hydraulic control one-way valve is communicated with a rodless cavity of the corresponding oil cylinder, and N is more than or equal to 2.
And furthermore, the hydraulic control valve further comprises a pressure sensor, and the pressure sensor is connected between the oil inlets of the N hydraulic control one-way valves and the load port of the balance valve.
And the oil inlet of each overflow valve is communicated with the load port of the corresponding hydraulic control one-way valve and the rodless cavity of the corresponding oil cylinder, and the oil outlet of each overflow valve is communicated with the oil tank.
Furthermore, the overflow pressure of each overflow valve is 5% -10% higher than the working pressure of the system.
Furthermore, the valve core of the overflow valve is of a cone valve structure.
Further, N =2.
Furthermore, each hydraulic control one-way valve and the corresponding overflow valve are arranged on the corresponding oil cylinder in an integrated valve block mode.
Further, the N oil cylinders are oil cylinders with the same specification.
Further, the N oil cylinders are uniformly arranged relative to the load.
According to the working method of the high-reliability hydraulic rigid synchronous system, the method comprises a lifting process and a lodging process, wherein the lifting process comprises the following steps:
the electromagnetic directional valve is electrified and switched to a left functional position, a port P of the electromagnetic directional valve is communicated with a port B, a port T is communicated with a port A, pressure oil is output from the port B of the electromagnetic directional valve, the pressure oil is opened in the forward direction and respectively enters corresponding rodless cavities of N oil cylinders through the balance valve and the N hydraulic control one-way valves, the N overflow valves are in a closed state and have no leakage, hydraulic oil in rod cavities of the N oil cylinders returns to the port T through the port A of the electromagnetic directional valve, once a rodless cavity oil pipe between the balance valve and the hydraulic control one-way valves bursts in the lifting process, the pressure at an oil inlet of the hydraulic control one-way valves is sharply reduced until no pressure exists, the hydraulic control one-way valves are closed, the hydraulic oil in the rodless cavities of the oil cylinders cannot leak, and the oil cylinders stop at the current positions to ensure safety;
the lodging process is as follows:
when the oil pipe of the rodless cavity of the N oil cylinders reversely passes through the corresponding hydraulic control one-way valve and the balance valve, the hydraulic oil returns to the T port through the opening of the electromagnetic directional valve B, once the oil pipe of the rodless cavity bursts, the balance valve releases the balance pressure, the pressure sensor detects that the pressure is reduced, the lodging action is closed, no pressure exists at the pressure guide opening of the hydraulic control one-way valve, the hydraulic control one-way valve is closed, the hydraulic oil in the rodless cavity of the oil cylinders cannot leak, the oil cylinder stops at the current position to ensure safety, when the oil cylinder is in the lifting state and collapses rapidly, if the environmental temperature rises, the volume of the oil cylinder in the rodless cavity expands, the volume of the hydraulic control one-way valve in the rod cavity expands, the hydraulic oil in the rodless cavity of the oil cylinder cannot leak, the hydraulic oil pressure of the hydraulic control one-way valve can not exceed the set value of the pressure of the hydraulic oil cylinder, and the pressure of the hydraulic oil cylinder can not leak when the hydraulic oil cylinder is in the lifting state and the rod-free pressure working system starts to open, and the pressure of the hydraulic oil cylinder can not exceed the set value.
Compared with the prior art, the invention has the beneficial effects that:
(1) The rodless cavities of the oil cylinders are respectively provided with an integrated valve block mounting type hydraulic control one-way valve as a safety valve, the hydraulic control one-way valves are closed when the oil cylinders stop at any position or an oil pipe bursts, so that the oil cylinders stop at the current position and do not drop to ensure safety, the hydraulic control one-way valves of the oil cylinders are connected in parallel and then connected in series with a balance valve, the balance valve plays a role in controlling speed to prevent equipment from stalling when the equipment is laid down, the rodless cavities of the oil cylinders are mutually communicated through the hydraulic control one-way valves to ensure that the balance pressure is equal when the equipment is laid down, so that the stress of the piston of the oil cylinder cannot generate difference due to the balance pressure error and change of the balance valve, the synchronization precision is high, and the reliability is high;
(2) An overflow valve is arranged between a load port of the hydraulic control one-way valve and a rodless cavity of the oil cylinder, a valve core of the overflow valve is of a cone valve structure, the overflow pressure is 5% -10% higher than the working pressure of the system, the overflow valve is guaranteed to be reliably closed and leak-free when in normal working, the normal action of the oil cylinder is not influenced, when the volume of hydraulic oil in the rodless cavity of the oil cylinder is expanded due to the rise of the environmental temperature, the overflow valve starts to overflow when the pressure generated by thermal expansion reaches the overflow pressure, so that the pressure of the load port of the hydraulic control one-way valve cannot exceed the limit value, the working pressure of the system can reversely open the hydraulic control one-way valve, and the influence of the change of the environmental temperature is avoided;
(3) A pressure sensor is arranged between the oil inlet of the hydraulic control one-way valve and the load port of the balance valve, if the oil pipe bursts in the action process, the control module can timely detect pressure change and close the action, and the safety is improved.
Drawings
Fig. 1 is a hydraulic schematic diagram of a conventional hydraulic rigid synchronous system.
Fig. 2 is a hydraulic schematic diagram of the high reliability hydraulic rigid synchronization system of the present invention.
In the figure: the system comprises an electromagnetic directional valve 1, a balance valve 2, a pressure sensor 3, a hydraulic control one-way valve 4 a, a hydraulic control one-way valve 5 b, an overflow valve 6 a, an overflow valve 7 b, an oil cylinder 8 a, an oil cylinder 9 b, an oil tank 10 and an oil pipe 11 without a rod cavity.
Detailed Description
The invention is described in further detail below with reference to fig. 2.
In the following, the two numbers of the pilot operated check valves, the relief valves and the cylinders are described as an example, but the number of the above components of the present invention may be more than two.
Referring to fig. 2, a high-reliability hydraulic rigid synchronization system includes an electromagnetic directional valve 1, a balance valve 2, a pressure sensor 3, a pilot operated check valve a4, a pilot operated check valve b5, an overflow valve a6, an overflow valve b7, an oil cylinder a8, and an oil cylinder b9. The port 1A of the electromagnetic directional valve is communicated with the pilot port of the balance valve 2, the pilot port of the hydraulic control one-way valve a4, the pilot port of the hydraulic control one-way valve B5, the rod cavity of the oil cylinder a8 and the rod cavity of the oil cylinder B9, the port 1B of the electromagnetic directional valve is communicated with the oil inlet of the balance valve 2, the load port of the balance valve 2 is communicated with the oil inlet of the hydraulic control one-way valve a4 and the oil inlet of the hydraulic control one-way valve B5, the load port of the hydraulic control one-way valve a4 is communicated with the rodless cavity of the oil cylinder a8, the load port of the hydraulic control one-way valve B5 is communicated with the rodless cavity of the oil cylinder B9, and the pressure sensor 3 is positioned between the oil inlet of the hydraulic control one-way valve a4, the oil inlet of the hydraulic control one-way valve B5 and the load port of the balance valve 2.
Preferably, an oil inlet of the overflow valve a6 is communicated with a load port of the hydraulic control one-way valve a4 and a rodless cavity of the oil cylinder a8, and an oil outlet of the overflow valve a6 is communicated with the oil tank 10. The oil inlet of the overflow valve b7 is communicated with the load port of the hydraulic control one-way valve b5 and the rodless cavity of the oil cylinder b9, and the oil outlet of the overflow valve b7 is communicated with the oil tank 10.
Preferably, the relief valves a and b set the relief pressure to be 5% -10% higher than the system working pressure.
Preferably, the valve cores of the relief valves a6 and b7 are cone valves.
Preferably, the hydraulic control one-way valve a4 and the overflow valve a6 are installed on the oil cylinder a in an integrated valve block mode. And the hydraulic control one-way valve b5 and the overflow valve b7 are arranged on the oil cylinder b in an integrated valve block mode.
Preferably, the oil cylinder a8 and the oil cylinder b9 are oil cylinders with the same specification.
Preferably, the oil cylinder a8 and the oil cylinder b9 are uniformly arranged relative to the load.
And the rodless cavities of the oil cylinder a8 and the oil cylinder b9 are bearing cavities, extend out when lifted and retract when laid down.
Lifting working principle: the electromagnetic directional valve 1 is switched to a left functional position in an electrified mode, a port B of the electromagnetic directional valve 1P is communicated, a port A of the T is communicated, pressure oil is output from the port B of the electromagnetic directional valve 1, the pressure oil is opened in the forward direction and passes through the balance valve 2, the hydraulic control one-way valve a4 and the hydraulic control one-way valve B5, the overflow valve a6 and the overflow valve B7 are in a closed state and are not leaked, the pressure oil enters a rodless cavity of the oil cylinder a8 and a rodless cavity of the oil cylinder B9, a rod cavity of the oil cylinder a8 is provided, and hydraulic oil in the rod cavity of the oil cylinder B9 returns to the port T through the port A of the electromagnetic directional valve 1. The piston areas of the oil cylinder a8 and the oil cylinder b9 which have the same specification are equal, the pressure of two communicated cavities of a rodless cavity of the oil cylinder a8 and a rodless cavity of the oil cylinder b9 is equal, and the thrust of the rodless cavity borne by the piston of the oil cylinder a8 and the piston of the oil cylinder b9 are equal; the oil cylinder a8 and the oil cylinder b9 are equal to the load force borne by the piston which is uniformly distributed relative to the bearing equipment. The main stress of the oil cylinder piston during lifting is rodless cavity thrust and load force, so that the stress difference of the two cylinder pistons is very small, the two cylinder pistons can be stressed in a balanced manner only by small elastic stress, the two cylinders synchronously extend out, the elastic deformation of the mechanism is small, and the synchronization precision is high.
In the lifting process, once the oil pipe 11 in the rodless cavity bursts, the pressure at the oil inlets of the hydraulic control one-way valve a4 and the hydraulic control one-way valve b5 is sharply reduced until no pressure exists, the hydraulic control one-way valve a4 and the hydraulic control one-way valve b5 are closed, so that hydraulic oil in the rodless cavity of the oil cylinder a8 and the rodless cavity of the oil cylinder b9 cannot leak, and the oil cylinder a8 and the oil cylinder b9 stop at the current positions to ensure safety.
Lodging working principle: the electromagnetic directional valve 1 is switched to a right functional position by electrifying, a port P of the electromagnetic directional valve 1 is communicated with a port A, a port T is communicated with a port B, pressure oil is output to a rod cavity of an oil cylinder a8 from the port A of the electromagnetic directional valve 1, a rod cavity of the oil cylinder B9, a pilot port of a pilot-controlled check valve a4, a pilot port of a pilot-controlled check valve B5 and a pilot port of a balance valve 2 from the port A of the electromagnetic directional valve, the pilot-controlled check valve a4, the pilot-controlled check valve B5 and the balance valve 2 are opened reversely under the action of pilot pressure, a load port of the balance valve 2 generates balance pressure, an overflow valve a6 and an overflow valve B7 are in a closed state without leakage, and hydraulic oil in a rodless cavity of the oil cylinder a8 and a rodless cavity of the oil cylinder B9 reversely passes through the pilot-controlled check valve a4, the pilot-controlled check valve B5 and the balance valve 2 and then returns oil to the port T through the port B of the electromagnetic directional valve 1. The oil cylinder a8 and the oil cylinder b9 have the same specification and the same piston area, the pressure of a rod cavity of the oil cylinder a8 is equal to that of a rod cavity communicated with the rod cavity of the oil cylinder b9, and the thrust of the rod cavities of the oil cylinder a8 and the oil cylinder b9 is equal; the oil cylinder a8 and the oil cylinder b9 are uniformly distributed relative to the bearing equipment, and the load forces borne by the pistons are equal; the balance pressure of the two communicated cavities of the rodless cavity of the oil cylinder a8 and the rodless cavity of the oil cylinder b9 is equal, and the balance force borne by the piston of the oil cylinder a8 is equal to that borne by the piston of the oil cylinder b9. When the mechanism is laid down, the oil cylinder piston is mainly stressed by the rod cavity thrust force, the loading force and the balance force, so that the stress difference of the two cylinder pistons is very small, the two cylinder pistons can be stressed in a balanced manner only by small elastic stress, the two cylinders retract synchronously, the elastic deformation of the mechanism is small, and the synchronous precision is high.
In the lodging process, once the oil pipe 11 of the rodless cavity bursts, the balance pressure of the balance valve 2 is released, the pressure sensor 3 detects that the pressure is sharply reduced, the control module closes the lodging action, the pressure guide ports of the hydraulic control one-way valve a4 and the hydraulic control one-way valve b5 are free of pressure, the hydraulic control one-way valve a4 and the hydraulic control one-way valve b5 are closed, hydraulic oil in the rodless cavity of the oil cylinder a8 and the rodless cavity of the oil cylinder b9 cannot leak, and the oil cylinder a8 and the oil cylinder b9 stop at the current positions to ensure safety.
When the lifting type hydraulic control device is in a lifting state for lodging, if the lifting type hydraulic control device stands for a long time and the environmental temperature rises, the volumes of hydraulic oil in the rodless cavities of the oil cylinder a8 and the oil cylinder b9 expand, due to the sealing action of the hydraulic control one-way valve a4 and the hydraulic control one-way valve b5, pressure is formed in the rodless cavities of the oil cylinder a8 and the oil cylinder b9, when the pressure is higher than the set values of the overflow valve a6 and the overflow valve b7, the overflow is started, the pressure of a load port of the hydraulic control one-way valve a4 and the pressure of a load port of the hydraulic control one-way valve b5 cannot exceed the limit value, the working pressure of the system can be ensured to reversely open the hydraulic control one-way valve a4 and the hydraulic control one-way valve b5, and the normal lodging can be realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A working method of a high-reliability hydraulic rigid synchronous system comprises an electromagnetic directional valve (1), a balance valve (2), N hydraulic control one-way valves, N overflow valves and N oil cylinders,
the port A of the electromagnetic directional valve (1) is communicated with the pilot port of the balance valve (2), the pilot port of each hydraulic control one-way valve and the rod cavity of each oil cylinder, the port B of the electromagnetic directional valve (1) is communicated with the oil inlet of the balance valve (2), the load port of the balance valve (2) is communicated with the oil inlet of each hydraulic control one-way valve, the load port of each hydraulic control one-way valve is communicated with the rodless cavity of the corresponding oil cylinder, and N is more than or equal to 2;
the oil inlet of the N hydraulic control one-way valves is connected with the load port of the balance valve (2);
each hydraulic control one-way valve and the corresponding overflow valve are arranged on the corresponding oil cylinder in an integrated valve block mode;
the N oil cylinders are oil cylinders with the same specification;
the N oil cylinders are uniformly distributed relative to the load;
the method is characterized by comprising a lifting process and a lodging process, wherein the lifting process comprises the following steps:
the electromagnetic directional valve (1) is electrified and switched to a left functional position, a port P of the electromagnetic directional valve (1) is communicated with a port B, a port T is communicated with a port A, pressure oil is output from the port B of the electromagnetic directional valve (1), the pressure oil is opened in the forward direction and respectively enters corresponding rodless cavities of N oil cylinders through the balance valve (2) and the N hydraulic control one-way valves, N overflow valves are closed and do not leak, hydraulic oil in rod cavities of the N oil cylinders returns to the port T through the port A of the electromagnetic directional valve (1), once a rodless cavity oil pipe (11) between the balance valve (2) and the hydraulic control one-way valves bursts, the pressure at an oil inlet of the hydraulic control one-way valves is sharply reduced until no pressure exists, the hydraulic control one-way valves are closed, the hydraulic oil in the rodless cavities of the oil cylinders cannot leak, and the oil cylinders stop at the current positions to ensure safety;
the lodging process is as follows:
when the hydraulic oil in the rodless cavity oil pipe (11) bursts once, the balance pressure of the balance valve (2) is released, the pressure sensor (3) detects that the pressure is sharply reduced, the lodging action is closed, the pressure of the pilot port of the one-way valve is unpressurized, the one-way valve is closed, the pressure of the one-way valve is unpressurized, the hydraulic oil in the rodless cavity of the one-way valve is unpressurized, the one-way valve is closed, the leakage of the one-way valve in the rodless cavity of the oil cylinder is avoided, the pressure of the one-way valve is prevented from being leaked, the pressure of the one-way valve is prevented from being increased when the pressure of the one-way valve is not increased, the working temperature of the one-way valve is ensured to be higher than the preset value, and the working temperature of the one-way valve is ensured to be higher than the preset value.
2. The working method of claim 1, further comprising an oil tank (10), wherein an oil inlet of each overflow valve is communicated with a load port of the corresponding hydraulic control one-way valve and a rodless cavity of the corresponding oil cylinder, and an oil outlet of each overflow valve is communicated with the oil tank (10).
3. The method of claim 2, wherein the relief pressure of each relief valve is between 5% and 10% higher than the system operating pressure.
4. The method of claim 2, wherein the spool of the excess flow valve is of a cone valve configuration.
5. The operating method according to claim 2, characterized in that said N =2.
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| CN103130099B (en) * | 2013-03-11 | 2015-02-18 | 徐工集团工程机械股份有限公司 | Crawler crane mast lifting hydraulic control system and method |
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