CN113027841A - Integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system - Google Patents
Integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system Download PDFInfo
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- CN113027841A CN113027841A CN201911346445.4A CN201911346445A CN113027841A CN 113027841 A CN113027841 A CN 113027841A CN 201911346445 A CN201911346445 A CN 201911346445A CN 113027841 A CN113027841 A CN 113027841A
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- 239000003921 oil Substances 0.000 description 168
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- 238000006073 displacement reaction Methods 0.000 description 4
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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Abstract
The invention discloses an integrated bidirectional pump control high-speed double-cylinder synchronous hydraulic control system, which comprises a servo motor, a bidirectional pump, an oil tank, a quick oil cylinder and an oil path integrated block, wherein the oil path integrated block comprises a first safety valve, a pressure reducing valve, a two-position four-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a back pressure valve, a second safety valve, a brake overflow valve, a two-position two-way electromagnetic ball valve, a one-way valve, a pressure sensor and a liquid filling valve, the servo motor is connected with the bidirectional pump, and one end of the bidirectional pump is respectively connected with inlets of the pressure reducing valve, the first safety valve and the three-position four-way electromagnetic directional valve. The frame is deformed to different degrees and oil cylinders with different friction forces are adopted. High-speed short-stroke bending instability, slow switching point conversion and instability; the sliding block stops impacting greatly in the middle of the process of moving down; reduce the installation workload and the like.
Description
Technical Field
The invention belongs to the technical field of pump control hydraulic systems, and relates to a bidirectional pump control high-speed double-cylinder synchronous hydraulic control system, in particular to a bidirectional pump control system, which controls an oil cylinder (namely a quick cylinder) mode in a special structural form and is applied to the bending machine industry and other double-cylinder synchronous fields.
Background
With the development of control systems and hydraulic technologies and the trend of energy conservation, high efficiency and noise reduction in the current stage of the manufacturing industry, in the current bending machine industry, the application of a pump control system gradually exposes a head corner, and a bending machine synchronous control system controlled by an electro-hydraulic proportional valve is gradually replaced by the pump control system. However, in a pump control system in the current market, no matter a gear pump or a plunger pump, the oil discharge amount of a lower cavity of an oil cylinder is controlled in the quick descending stage of the oil cylinder, the quick descending speed of a sliding block is controlled, the power of the quick descending comes from the self weight of the sliding block, and the system is called as a passive quick system. The oil cylinder moves downwards mainly through the dead weight of the piston cylinder, and because the friction force of each oil cylinder is different, the oil cylinder moves downwards quickly uncontrollably strictly, the quick descending speed of the oil cylinder is not completely dependent on the oil discharge amount of the lower cavity of the oil cylinder, and the oil cylinder can be influenced by a series of external factors such as the friction force of a guide rail of a machine tool, the tightness degree of a piston of the oil cylinder, the verticality of a slide block and the like. The fast downlink speed cannot be fully controllable. Further, in the short-stroke bending, the instability of the operation and the difficulty of the operation adjustment are large. In the conventional pump control system, when the pump is stopped quickly and intermediately, actual braking is quickly closed by a switch valve, the impact of the quick stopping and intermediately stopping is large, and the switching point has an overshoot phenomenon, so that great difficulty is brought to debugging work. The system adopts a split type, the hydraulic system is connected with the oil cylinder through a pipeline, and the pipe joint leakage points connected through the pipeline are more, so that a plurality of defects exist. Therefore, how to overcome the above technical problems becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above problems, the present invention provides an integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system, which effectively solves the above disadvantages of the conventional pump control technology by combining a pump control system with a fast cylinder with a special structure.
In order to achieve the purpose, the invention provides the following technical scheme: an integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system comprises a servo motor, a bidirectional pump, an oil tank, a quick oil cylinder and an oil circuit integrated block, wherein the oil circuit integrated block comprises a first safety valve, a pressure reducing valve, a two-position four-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a back pressure valve, a second safety valve, a brake overflow valve, a two-position two-way electromagnetic ball valve, a one-way valve, a pressure sensor and a liquid filling valve, the servo motor is connected with the bidirectional pump, one end of the bidirectional pump is respectively connected with inlets of the pressure reducing valve, the first safety valve and the three-position four-way electromagnetic directional valve, an outlet of the pressure reducing valve is connected with an inlet of the two-position four-way electromagnetic directional valve, the other end of the bidirectional pump and an outlet of the first safety valve are respectively connected with the oil tank, the three-position four-, the two-position two-way electromagnetic ball valve is connected with the second safety valve, the back pressure valve, the check valve and the lower cavity of the oil cylinder, and the liquid filling valve is connected with the large cavity of the oil cylinder.
Preferably, the bidirectional pump comprises a first oil port and a second oil port, the first oil port is respectively connected with the pressure reducing valve, the first safety valve and the inlet of the three-position four-way electromagnetic directional valve, and the second oil port is connected with the oil tank.
Preferably, the two-position four-way electromagnetic directional valve comprises a first two-position four-way electromagnetic directional valve and a second two-position four-way electromagnetic directional valve, the second two-position four-way electromagnetic directional valve is respectively connected with the pressure sensor and the large oil cylinder cavity, the first two-position four-way electromagnetic directional valve is connected with the liquid filling valve, and an inlet of the second two-position four-way electromagnetic directional valve is connected with the three-position four-way electromagnetic directional valve.
Preferably, the servo motor and the bidirectional pump are connected with the quick oil cylinder through an oil circuit manifold block.
Preferably, the three-position four-way electromagnetic directional valve is respectively connected with the quick cavity of the quick oil cylinder and the two-position four-way electromagnetic directional valve, and the two-position four-way electromagnetic directional valve is connected with the large cavity of the quick cylinder.
Preferably, the quick oil cylinder is of a quick cylinder structure: namely, one cylinder of the main oil cylinder is divided into a quick cavity and a main pressurizing cavity, and the pressure sensor is connected with the pressurizing cavity of the main oil cylinder.
Preferably, the lower cavity of the oil cylinder is connected with the quick ball valve, the brake overflow valve, the one-way valve and the back pressure valve.
Compared with the prior art, the invention has the following beneficial effects: the servo motor oil pump is combined with the quick cylinder with the quick cavity through a hydraulic circuit, namely the same oil cylinder is divided into the quick cavity (small cavity) and the pressurizing cavity (large cavity), when the oil cylinder rapidly descends, the oil pump pumps oil to the quick cavity of the main cylinder to push the piston of the main oil cylinder to actively descend, the rapid descending speed of the oil cylinder is controlled by controlling the amount of oil pumped to the quick cavity by the oil pump, the descending speed of the oil cylinder is completely controllable, and the mode is different from the mode of rapidly descending by the dead weight of a sliding block in the past. On the premise of the same size of the oil pump, the rapid approaching speed is greatly improved by changing the area of the rapid cavity. The lower cavity quick-release ball valve is additionally provided with the brake overflow valve, no impact can be caused when the lower cavity quick-release ball valve stops quickly, the brake overflow valve is used, the response is quick during braking, and the overshoot problem during stopping can be solved. The pump control unit is directly connected with the oil cylinder, so that the connection of an intermediate pipeline can be omitted, the connection of an oil-free pipe of the bending machine can be realized, the installation is simple and easy, the oil leakage is reduced, the installation workload is reduced, and the like. The invention is two sets of completely independent pump control units with the same principle, and the pump control units are used simultaneously. The oil cylinder slide block positioning device is directly installed at the top of an oil cylinder respectively in installation, the oil discharge amount of a bidirectional pump is adjusted through real-time adjustment of the rotating speed of a servo motor and combined action of a displacement sensor, the operation speed of a bending machine is controlled, and finally the purpose of high-speed accurate positioning of the oil cylinder slide block is achieved. The descending speed of the oil cylinder can reach about 300mm/s, and the position of the oil cylinder is controllable.
Drawings
FIG. 1 is a schematic diagram of the system control of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system comprises a servo motor, a bidirectional pump, an oil tank, a quick oil cylinder and an oil path manifold block;
the oil circuit manifold block comprises a first safety valve, a pressure reducing valve, a two-position four-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a back pressure valve, a second safety valve, a brake overflow valve, a two-position two-way electromagnetic ball valve, a one-way valve, a pressure sensor and a liquid charging valve;
the servo motor is connected with the two-way pump, the servo motor and the two-way pump are connected with the quick oil cylinder through an oil circuit manifold block, preferably, one end of the two-way pump is respectively connected with a pressure reducing valve, a first safety valve and an inlet of a three-position four-way electromagnetic directional valve, wherein an outlet of the pressure reducing valve is connected with an inlet of the two-position four-way electromagnetic directional valve, the other end of the two-way pump and an outlet of the first safety valve are respectively connected with an oil tank, preferably, the two-way pump comprises a first oil port and a second oil port, the first oil port is respectively connected with the pressure reducing valve, the first safety valve and the inlet of the;
in the invention, a three-position four-way electromagnetic directional valve is respectively connected with a back pressure valve, a brake overflow valve, a one-way valve, a quick cylinder quick cavity and an inlet of a two-position four-way electromagnetic directional valve, the two-position four-way electromagnetic directional valve is connected with a pressure sensor, a large oil cylinder cavity and a liquid filling valve, the two-position two-way electromagnetic ball valve is respectively connected with a second safety valve, the back pressure valve, the one-way valve and a lower oil cylinder cavity, the liquid filling valve is connected with the large oil cylinder cavity, further preferably, the two-position four-way electromagnetic directional valve comprises a first two-position four-way electromagnetic directional valve and a second two-position four-way electromagnetic directional valve, the second two-position four-way electromagnetic directional valve is respectively connected with the pressure sensor and the large oil cylinder cavity, the first two-position four-way electromagnetic directional valve is connected with.
In the invention, a three-position four-way electromagnetic directional valve is respectively connected with a quick cavity of a quick oil cylinder and a two-position four-way electromagnetic directional valve, the two-position four-way electromagnetic directional valve is connected with a big cavity of the quick oil cylinder, wherein the quick oil cylinder is of a quick cylinder structure: namely, one cylinder of the main oil cylinder is divided into a quick cavity and a main pressurizing cavity, the pressure sensor is connected with the pressurizing cavity of the main oil cylinder, and the lower cavity of the oil cylinder is connected with the quick ball valve, the brake overflow valve, the check valve and the back pressure valve.
The following provides a specific embodiment of the present invention
Example 1
Referring to fig. 1, the integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system comprises a servo motor 5, a bidirectional pump 4, an oil tank 1, a quick oil cylinder 19 and an oil path integrated block, wherein the oil path integrated block comprises a first one-way valve 2, a second one-way valve 3.1, a third one-way valve 3.2, a pressure measuring joint 6, a liquid filling valve 7, a first two-position four-way electromagnetic directional valve 8, a pressure reducing valve 9, a first safety valve 10, a second safety valve 11, a quick lower ball valve 12, a back pressure valve 13, a brake overflow valve 14, a one-way valve 15, a three-position four-way electromagnetic directional valve 16, a second two-position four-way electromagnetic directional valve 17 and a pressure sensor 18. The servo motor 5 is connected with the two-way pump 4, the two-way pump 4 comprises a first oil port and a second oil port, wherein the first oil port 41 is respectively connected with an inlet of a pressure reducing valve 9, an inlet of a first safety valve 10 and an inlet of a three-position four-way electromagnetic directional valve 16, an outlet of the pressure reducing valve is connected with an inlet of a first two-position four-way electromagnetic directional valve 8, the second oil port 42 is connected with the oil tank 1, an outlet of the first safety valve 10 is connected with a third one-way valve 3.2, the three-position four-way electromagnetic directional valve 16 is respectively connected with an outlet of a back pressure valve 13, an outlet of a brake overflow valve 14, an inlet of a one-way valve 15, a quick cavity of a quick oil cylinder 19 and an inlet of a second two-position four-way electromagnetic directional valve 17, the second two-position four-way electromagnetic directional valve 17 is connected with a pressure sensor 18 and a large cavity of the quick oil cylinder 19, the first, the inlet of a back pressure valve 13, the outlet of a check valve 15 and the lower cavity of a quick oil cylinder 19 are connected, a liquid filling valve 7 is connected with the large cavity of the quick oil cylinder 19, the inlet of a brake overflow valve 14 is connected with the inlet of a quick lower ball valve 12, the outlet of a second safety valve 11 is connected with a first check valve 2, a T port of a three-position four-way electromagnetic directional valve 16 is connected with a T port of a second two-position four-way electromagnetic directional valve 17, the T port of the second two-position four-way electromagnetic directional valve is connected with a second check valve 3.1, the first check valve 2, the second check valve 3.1 and the third check valve 3.2 are connected. A fast cavity (small cavity) and a pressurizing cavity (large cavity) are arranged in the fast oil cylinder 19.
In this embodiment, the servo motor 5, the bidirectional pump 4 and the bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system controlled by the fast oil cylinder 19 adjust the oil discharge amount of the bidirectional pump 4 by adjusting the rotation speed of the servo motor 5 in real time, and control the operation speed of the bending machine by the fast oil cylinder 19. Finally, the purpose of high-speed and accurate positioning of the sliding block is achieved. The bending machine can be well suitable for bending machines produced by most bending machine manufacturers at present.
In the existing bending machine industry, the oil cylinder moves downwards quickly mainly under the action of self weight of the sliding block through the piston cylinder, and the stability is poor due to the influence of friction force of a mechanical part and installation progress. In order to enable the oil cylinder to stably and quickly descend, the oil cylinder adopts a quick oil cylinder 19 with a special structure. The servo motor 5 is used for controlling the bidirectional pump 4 to provide hydraulic oil for the quick oil cylinder 19, the displacement sensor is used for detecting the positions of two sides of the bending machine sliding block 21 connected with the quick oil cylinder 19, a position signal is transmitted to the controller, the controller is used for adjusting the rotating speed of the servo motor 5 again by comparing the deviation between the position detection signal and a given signal, the quick oil cylinder 19 can drive the bending machine sliding block 21 to rapidly move downwards, the speed can reach about 300mm/s, and the position is controllable.
The invention can not only realize fast feeding, pressure maintaining, unloading and return instructions, fast speed, controllability, small volume and the like of the bending machine, but also be well suitable for bending machines produced by most bending machine manufacturers at present. The invention adopts the servo motor 5 and the bidirectional pump 4, and two oil ports of the bidirectional pump 4 are respectively connected with the upper cavity and the lower cavity of the quick oil cylinder 19 through the hydraulic circuit, thereby forming a control mode which has the same valve control effect. When the piston moves downwards quickly, the numerical control system gives a positive instruction to the servo motor 5, the bidirectional pump 4 rotates forwards to pump oil, the oil enters the quick cavity of the quick oil cylinder 19 through the hydraulic circuit, and the piston is actively pushed to realize the quick movement; the numerical control system continues to give a positive instruction to the servo motor 5 during the working process, the bidirectional pump 4 pumps oil to the quick cavity and the pressurizing cavity of the quick oil cylinder 19 simultaneously, and hydraulic oil in the lower cavity of the quick oil cylinder 19 returns to the oil tank 1 through the back pressure valve 13 and the right position of the three-position four-way electromagnetic directional valve 16 to realize slow approaching; during pressure maintaining, the numerical control system gives a very small rotating speed instruction to the servo motor 5 and only gives a torque instruction, the bidirectional pump 4 does not actually output oil, only under the driving of the servo motor 5, the bidirectional pump 4 is basically kept at a certain position, the pressure maintaining of the system is realized, and because the bidirectional pump 4 does not basically output flow, no overflow loss is generated during the pressure maintaining; when unloading, the numerical control system gives a negative instruction to the servo motor 5, the high-pressure oil in the pressurizing cavity and the high-pressure oil in the rapid cavity of the rapid oil cylinder 19 are pumped back to the oil tank 1 through the second two-position four-way electromagnetic directional valve of the three-position four-way electromagnetic directional valve 16 until the pressure is relieved by the pressure sensor 18; when pressure relief is finished and return stroke is performed, the numerical control system continues to give a positive instruction to the servo motor 5, the bidirectional pump 4 pumps oil, the oil enters the lower cavity of the quick oil cylinder 19 through the three-position four-way electromagnetic directional valve and enters the upper cavity to discharge oil, and return stroke action is realized. In the whole action cycle, the working process, the pressure maintaining and the return stroke are positive instructions, and the unloading is a negative instruction.
Referring to fig. 1, since the bending machine is controlled by two cylinders and is jointly realized by two independent servo hydraulic control units with the same control principle, the control principle of one cylinder is taken as an example for explanation, and the control principle of the other cylinder is completely the same as that described above.
Quickly getting down: electromagnets Y1 and Y4 are powered on, a numerical control system gives a positive instruction to a servo motor 5, a bidirectional pump 4 rotates positively to pump oil, the pumped oil enters a quick cavity of the quick cylinder through the right position of a three-position four-way electromagnetic reversing valve 16, the quick cylinder is pushed to move downwards quickly, meanwhile, a large amount of oil is supplemented in a pressurizing cavity (large cavity) through a liquid filling valve 7 in a self-absorption mode, the oil in a lower cavity passes through a quick lower ball valve 12, a brake overflow valve 14 and a right oil return tank of the three-position four-way electromagnetic reversing valve 16, and the quick descending of a sliding block is achieved. The speed of the slide block can be obtained by adjusting the numerical control system parameters to control the speed of the servo motor 5.
Feeding: the electromagnets Y3 and Y6 are electrified, and Y4 is continuously electrified. The numerical control system continues to give a positive instruction to the servo motor 5, the rotating speed of the servo motor 5 is gradually reduced, so that the speed of the sliding block is gradually stopped from fast descending, Y6 is electrified, the liquid filling valve 7 is closed, and the oil tank 1 is suspended from supplying oil to the upper cavity of the fast oil cylinder 19. The oil pumped by the oil pump partially enters the fast cavity and partially enters the pressurizing cavity, and the oil cylinder enters a slow working state because the area of the fast cavity is smaller than that of the pressurizing cavity. When the power of Y1 is lost, the oil in the lower cavity passes through the backpressure valve 13 and the right oil return tank of the three-position four-way electromagnetic directional valve. The working speed of the slide block can be obtained by adjusting the numerical control system parameters to control the rotating speed of the servo motor 5
Pressure maintaining: and power is continuously supplied to Y3, Y4 and Y6, the numerical control system gives a positive instruction to the servo motor 5 according to the deviation between the torque set value and the actual value, the servo motor 5 drives the bidirectional pump 4 to rotate at a low speed, the pressure of the upper cavity of the quick oil cylinder 19 is kept constant, and the sliding block is kept at the target value.
Unloading: and power is continuously supplied to Y3, Y4 and Y6, and the numerical control system gives a negative command to the servo motor 5. The servo motor 5 drives the bidirectional pump 4 to change speed and rotate reversely, high-pressure oil in the pressurizing cavity passes through the three-position four-way electromagnetic reversing valve 16, the second two-position four-way electromagnetic reversing valve 17, the bidirectional pump 4 and the oil return tank until pressure relief pressure set by the pressure sensor 18 is reached, pressure relief is finished, and the speed of pressure relief speed can be obtained by adjusting the rotating speed of the servo motor.
And (3) return stroke: and after pressure relief, Y5 is powered on, and the rest is powered off. The numerical control system gives a positive instruction to the servo motor 5. The servo motor 5 drives the bidirectional pump 4 to change speed and rotate reversely, and part of oil pumped by the oil pump enters the lower cavity of the oil cylinder through the three-position four-way electromagnetic directional valve 16 and the left check valve 15. The other part of the hydraulic oil passes through the first two-position four-way electromagnetic reversing valve 8 to open the liquid filling valve 7, most of the oil in the pressurizing cavity of the quick oil cylinder 19 returns to the oil tank through the liquid filling valve 7, and the other part of the oil returns to the oil tank through the two-position four-way electromagnetic reversing valve; the oil in the quick cavity directly returns to the oil tank through the left position of the three-position four-way electromagnetic reversing valve 16, and the quick upward movement of the sliding block is realized. The return speed can be adjusted by the numerical control system to obtain different speeds by adjusting the rotating speed of the servo motor 5.
The synchronous control of the two quick oil cylinders 19 of the bending machine is realized by two independent hydraulic control units consisting of two servo motors 5 and a bidirectional pump 4, and the two independent hydraulic control units are respectively controlled. And the device is controlled by a numerical control system and a displacement sensor 20 (a grating ruler or a magnetic grating ruler) together, so that the synchronous operation of the two quick oil cylinders 19 is realized, and the accurate positioning of the sliding block is realized. In the system, the synchronism of two quick oil cylinders 19 of the bending machine is adjusted by adjusting the oil discharge amount of the bidirectional pump 4. Meanwhile, the traditional piston cylinder is changed into a quick oil cylinder 19, the quick descending is changed from the former descending by self weight into the quick descending by actively pushing a quick cylinder piston by a quick cavity, and the former split type pump control is changed into a highly integrated pump control hydraulic system during installation.
On the basis of the control of the existing pump control system, the invention adopts a control mode of combining a pump control hydraulic system with a quick hydraulic cylinder (a quick cavity and a pressurizing cavity) with a special structure, changes a passive control mode depending on the self weight of a sliding block when the hydraulic cylinder is quickly lowered in the past on the premise of meeting the position control, and actively pumps oil to the quick cavity of the quick cylinder when the hydraulic cylinder is quickly lowered, actively pushes a piston rod to be quickly lowered, thereby weakening the factor of mechanical friction force, and having better stability and strong adaptability; the pressure sensor is adopted to detect the pressure relief pressure during pressure relief, the pressure relief is more thorough, the pressure relief mode depending on time in the past is changed, the pressure relief reaches the quantized degree, the pressure relief is more reliable, and the aim of flexible control is achieved. The lower cavity is additionally provided with the brake overflow valve, and the brake pressure can be adjusted according to the reality, so that the brake is more stable and reliable, and the problem of overshoot of the switching point in the past is solved. The special structure of the oil cylinder can change the area of a quick cavity of the oil cylinder on the premise of the same size of the oil pump, and compared with the prior art, the oil cylinder is easy to greatly increase the speed, thereby achieving the purpose of high-speed driving.
The control principle of one oil cylinder is one hydraulic unit, the invention uses two servo pump control units together, and other hydraulic systems which independently use one set of servo hydraulic unit control of the invention or simultaneously use two or more sets of servo hydraulic units control of the invention are all within the scope of the claims of the invention.
In conclusion, the hydraulic cylinder is simple in structure and reasonable in design, the servo motor oil pump is combined with the quick cylinder with the quick cavity through the hydraulic circuit, namely the same oil cylinder is divided into the quick cavity (small cavity) and the pressurizing cavity (large cavity), when the oil cylinder descends quickly, the oil pump pumps oil to the quick cavity of the main cylinder to push the piston of the main oil cylinder to descend actively, the quick descending speed of the oil cylinder is controlled by controlling the amount of oil pumped to the quick cavity by the oil pump, and the descending speed of the oil cylinder is completely controllable, so that the hydraulic cylinder is different from a conventional quick descending mode which depends on the self weight of a sliding block. On the premise of the same size of the oil pump, the rapid approaching speed is greatly improved by changing the area of the rapid cavity. The lower cavity quick-release ball valve is additionally provided with the brake overflow valve, no impact can be caused when the lower cavity quick-release ball valve stops quickly, the brake overflow valve is used, the response is quick during braking, and the overshoot problem during stopping can be solved. The pump control unit is directly connected with the oil cylinder, so that the connection of an intermediate pipeline can be omitted, the connection of an oil-free pipe of the bending machine can be realized, the installation is simple and easy, the oil leakage is reduced, the installation workload is reduced, and the like. The invention is two sets of completely independent pump control units with the same principle, and the pump control units are used simultaneously. The oil cylinder slide block positioning device is directly installed at the top of an oil cylinder respectively in installation, the oil discharge amount of a bidirectional pump is adjusted through real-time adjustment of the rotating speed of a servo motor and combined action of a displacement sensor, the operation speed of a bending machine is controlled, and finally the purpose of high-speed accurate positioning of the oil cylinder slide block is achieved. The descending speed of the oil cylinder can reach about 300mm/s, and the position of the oil cylinder is controllable.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The utility model provides a synchronous hydraulic control system of high-speed double-cylinder of two-way pump accuse of integral type which characterized in that: the hydraulic control system comprises a servo motor, a two-way pump, an oil tank, a quick oil cylinder and an oil line integrated block, wherein the oil line integrated block comprises a first safety valve, a pressure reducing valve, a two-position four-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, a back pressure valve, a second safety valve, a brake overflow valve, a two-position two-way electromagnetic ball valve, a check valve, a pressure sensor and a liquid filling valve, the servo motor is connected with the two-way pump, one end of the two-way pump is respectively connected with inlets of the pressure reducing valve, the first safety valve and the three-position four-way electromagnetic reversing valve, an outlet of the pressure reducing valve is connected with an inlet of the two-position four-way electromagnetic reversing valve, the other end of the two-way pump and an outlet of the first safety valve are respectively connected with the oil tank, the three-position four-way, The hydraulic cylinder comprises a large oil cylinder cavity and a liquid filling valve, wherein the two-position two-way electromagnetic ball valve is respectively connected with a second safety valve, a back pressure valve, a one-way valve and a lower oil cylinder cavity, and the liquid filling valve is connected with the large oil cylinder cavity.
2. The integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system of claim 1, characterized in that: the bidirectional pump comprises a first oil port and a second oil port, the first oil port is respectively connected with the pressure reducing valve, the first safety valve and the inlet of the three-position four-way electromagnetic directional valve, and the second oil port is connected with the oil tank.
3. The integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system of claim 1, characterized in that: the two-position four-way electromagnetic reversing valve comprises a first two-position four-way electromagnetic reversing valve and a second two-position four-way electromagnetic reversing valve, the second two-position four-way electromagnetic reversing valve is respectively connected with the pressure sensor and the large oil cylinder cavity, the first two-position four-way electromagnetic reversing valve is connected with the liquid filling valve, and an inlet of the second two-position four-way electromagnetic valve is connected with the three-position four-way electromagnetic reversing valve.
4. The integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system of claim 1, characterized in that: the servo motor and the bidirectional pump are connected with the quick oil cylinder through an oil circuit manifold block.
5. The integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system of claim 4, characterized in that: the three-position four-way electromagnetic directional valve is respectively connected with the quick cavity of the quick oil cylinder and the two-position four-way electromagnetic directional valve, and the two-position four-way electromagnetic directional valve is connected with the big cavity of the quick cylinder.
6. The integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system of claim 5, characterized in that: the quick oil cylinder is of a quick cylinder structure: namely, one cylinder of the main oil cylinder is divided into a quick cavity and a main pressurizing cavity, and the pressure sensor is connected with the pressurizing cavity of the main oil cylinder.
7. The integrated bidirectional pump-controlled high-speed double-cylinder synchronous hydraulic control system of claim 6, characterized in that: the lower cavity of the oil cylinder is connected with the quick ball valve, the brake overflow valve, the check valve and the back pressure valve.
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