CN210290327U - Oil cylinder micro-movement control system - Google Patents
Oil cylinder micro-movement control system Download PDFInfo
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- CN210290327U CN210290327U CN201921138467.7U CN201921138467U CN210290327U CN 210290327 U CN210290327 U CN 210290327U CN 201921138467 U CN201921138467 U CN 201921138467U CN 210290327 U CN210290327 U CN 210290327U
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- inlet pipe
- oil cylinder
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Abstract
The utility model discloses a small mobile control system of hydro-cylinder, include: the oil cylinder, the servo valve, the first oil pump and the first motor are arranged, an execution oil port of the servo valve is connected with an oil inlet pipeline end of the oil cylinder, an inlet end of the first oil pump is connected between the servo valve and an oil inlet pipeline of the oil cylinder, an outlet end of the first oil pump is communicated with an oil return box, the first motor is connected and installed on the first oil pump, the first oil pump is controlled and started by the first motor in the oil supply process of the oil cylinder controlled by the servo valve, and partial flow of the oil inlet pipeline of the oil cylinder is released by the first oil. The utility model discloses the certain leakage quantity that lets out of oil inlet pipe design for the hydro-cylinder discharges unnecessary flow, and the oil input reduces to the requirement that accords with the hydro-cylinder, makes the hydro-cylinder accomplish small removal, improves the precision.
Description
Technical Field
The utility model relates to an accurate hydraulic control system specifically is used for equipment such as mechanical testing machine of the small removal of accurate control hydro-cylinder.
Background
In the hydraulic testing machine for mechanical testing, accurate hydraulic control needs to be carried out on a hydraulic control system, the oil inlet flow of an oil cylinder is controlled only through a servo valve, and due to the characteristics of the servo valve, the oil inlet flow is easy to be overlarge, so that the control precision is not up to the standard. When the servo valve controls the oil cylinder to slightly move, if the fine adjustment lower limit of the servo valve is still higher than the oil quantity required by the oil cylinder to slightly move, namely, the oil supply of the servo valve every time exceeds the oil quantity required by the oil cylinder to slightly move, the oil cylinder cannot meet the precision requirement of the small movement at the moment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome above-mentioned prior art not enough, provide a small mobile control system of hydro-cylinder.
The utility model provides a technical scheme that above-mentioned technical problem adopted is: a kind of little movement control system of the cylinder, including: the oil cylinder, the servo valve, the first oil pump and the first motor are arranged, an execution oil port of the servo valve is connected with an oil inlet pipeline end of the oil cylinder, an inlet end of the first oil pump is connected between the servo valve and an oil inlet pipeline of the oil cylinder, an outlet end of the first oil pump is communicated with an oil return box, the first motor is connected and installed on the first oil pump, the first oil pump is controlled and started by the first motor in the oil supply process of the oil cylinder controlled by the servo valve, and partial flow of the oil inlet pipeline of the oil cylinder is released by the first oil.
The oil cylinder is provided with a low-position oil inlet pipeline and a high-position oil inlet pipeline, two execution oil ports of the servo valve are respectively connected with the low-position oil inlet pipeline and the high-position oil inlet pipeline, and the first oil pump is arranged on the low-position oil inlet pipeline of the oil cylinder.
The oil cylinder is provided with a low-position oil inlet pipeline and a high-position oil inlet pipeline, two execution oil ports of the servo valve are respectively connected with the low-position oil inlet pipeline and the high-position oil inlet pipeline, and the two first oil pumps are respectively arranged on the low-position oil inlet pipeline and the high-position oil inlet pipeline.
The system further comprises: oil tank, second oil pump and second motor, the oil inlet of oil tank, exit end connection servovalve is connected to the entry end of second oil pump, and the second motor is connected and is installed on the second oil pump, and the second motor cooperation second oil pump provides hydraulic oil for this system.
The system further comprises: and one end of the overflow valve is connected with the outlet end of the second oil pump, and the other end of the overflow valve is communicated with the oil return tank, so that the overflow valve only limits the upper pressure limit of hydraulic pressure and protects against overpressure.
The first motor and the second motor are constant-speed motors, servo motors or variable-frequency motors.
The first and second oil pumps are gear pumps, screw pumps, plunger pumps or vane pumps.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses the certain leakage quantity that lets out of oil inlet pipe design for the hydro-cylinder discharges unnecessary flow, and the oil input reduces to the requirement that accords with the hydro-cylinder, makes the hydro-cylinder accomplish small removal, improves the precision. According to the scheme, the oil cylinder is controlled to move slightly, so that the whole hydraulic system is accurately controlled.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced, wherein:
fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for the sake of clarity only, and are not intended to limit the scope of the invention, its relative relationship between the terms and their derivatives, and the scope of the invention should be understood as being limited by the claims.
Referring to fig. 1, a system for controlling micro movement of an oil cylinder according to a preferred embodiment of the present invention mainly includes: hydro-cylinder 5, servo valve 4, first oil pump 6 and servo motor 7, servo valve 4 connects on the oil inlet pipe of hydro-cylinder 5, the hydraulic oil flow that the servo valve 4 control got into hydro-cylinder 5, the entry end of first oil pump 6 is connected between servo valve 4 and the hydro-cylinder 5 oil inlet pipe, the exit end of first oil pump 6 leads to back to oil tank 9, servo motor 7 is connected and is installed on first oil pump 6, open and close first oil pump 6 by servo motor 7 control, in-process at the servo valve 4 for the hydro-cylinder 5 oil feed, control servo motor 7 and start first oil pump 6, release the oil inlet pipe flow of a part hydro-cylinder 5 by first oil pump 6. For example, the following steps are carried out: the minimum oil feeding amount of the servo valve 4 is 90ml/s, when the oil feeding amount of the servo valve 4 is 100ml/s, the moving speed of the oil cylinder 5 is 0.01mm/s, if the moving speed of the oil cylinder 5 needs to be controlled to be as low as 0.001mm/s, the flow of an oil inlet pipeline of the oil cylinder 5 is discharged at 90ml/s through the first oil pump 6, therefore, the oil feeding amount entering the oil cylinder 5 is reduced to 10ml/s, the moving speed of the oil cylinder 5 reaches 0.001mm/s, and the control precision of the oil cylinder is improved accordingly.
In the present embodiment specifically: the system further comprises: oil tank 1, second oil pump 2 and motor 3, oil tank 1 is used for the oil storage, and motor 3 connects and installs on second oil pump 2, opens and close second oil pump 2 by motor 3 control, and oil tank 1 is inserted to the entry end of second oil pump 2, and servo valve 4's oil inlet P is connected to the exit end of second oil pump 2, and motor 3 cooperates second oil pump 2, turns into the hydraulic energy that has certain pressure with the electric energy to provide hydraulic oil for this system.
The system may further comprise: and one end of the overflow valve 8 is connected with the outlet end of the second oil pump 2, one end of the overflow valve 8 is communicated with the oil return tank 9, and the overflow valve 8 is used for controlling the highest pressure of the oil outlet of the second oil pump 2 so as to protect the whole hydraulic system from overpressure.
The servo valve 4 is a standard component and has four interfaces, namely an oil inlet P, an oil return port T leading to the oil return tank 9, and two execution oil ports a and B capable of being connected with an oil inlet pipeline, wherein the two execution oil ports a and B are connected with the oil inlet P or the oil return port T respectively according to different function setting requirements. For example, when the function is set to the middle position function, the four interfaces are closed, and the oil cylinder 5 does not work; when the left function is set, PB is connected and TA is connected, and when the right function is set, PA is connected and TB is connected.
When the servo valve 4 is specifically connected with the oil cylinder 5, the oil cylinder 5 can be divided into two most common installation conditions on the market:
the utility model provides a, hydro-cylinder 5 has two oil feed pipelines, is low level oil feed pipeline and high-order oil feed pipeline respectively, and two execution hydraulic ports A and B of servovalve 4 are connected to low level oil feed pipeline and high-order oil feed pipeline respectively this moment, and first oil pump 6 then preferably sets up on the low level oil feed pipeline of hydro-cylinder 5. When the oil cylinder 5 works, when the servo valve 4 is in ｃA right position function, hydraulic oil enters the lower end of the oil cylinder 5 through ｃA P-A-low position oil inlet pipeline, the hydraulic oil at the upper end of the oil cylinder 6 returns to the oil return tank 9 through ｃA high position oil inlet pipeline-B-T, the oil cylinder 5 is driven to move towards one direction at the moment, and the first oil pump 6 releases flow through the low position oil inlet pipeline to directly play ｃA role in micro-movement control; when the servo valve 4 is in a left position function, hydraulic oil enters the upper end of the oil cylinder 5 through a P-B-high position oil inlet pipeline, the hydraulic oil at the lower end returns to the oil return tank 9 through a low position oil inlet pipeline-A-T, the oil cylinder 5 is driven to move towards the other direction, and the first oil pump 6 accelerates the release of flow through the low position oil inlet pipeline, so that the micro-movement control function is indirectly realized;
the above manner is designed based on cost consideration, and in other embodiments, the first oil pump 6 and the servo motor 7 may be disposed on both oil inlet pipes of the oil cylinder 5.
In another mode, the oil cylinder 5 only has one oil inlet pipeline, at the moment, the servo valve 4 only needs to start the corresponding left function or right function, the first oil pump 6 is directly arranged on the oil inlet pipeline, and all movement of the oil cylinder 5 is controlled by hydraulic oil of one oil inlet pipeline.
It should be noted that the servo motor 7 or the motor 3 mentioned in this embodiment may be replaced by a constant speed motor, a servo motor, a variable frequency motor, etc., and any power motor that can achieve the same control effect may be applied to the present invention; first oil pump 6 or second oil pump 2 mentioned in this embodiment specifically can be gear pump, screw pump, plunger pump, impeller pump etc. as long as can reach the various types of oil pumps of the same control effect, all can use the utility model discloses.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art can make any simple modification, equivalent change and modification to the above embodiments according to the technical spirit of the present invention without departing from the scope of the present invention.
Claims (7)
1. A kind of little movement control system of the cylinder, characterized by comprising: the oil cylinder, the servo valve, the first oil pump and the first motor are arranged, an execution oil port of the servo valve is connected with an oil inlet pipeline end of the oil cylinder, an inlet end of the first oil pump is connected between the servo valve and an oil inlet pipeline of the oil cylinder, an outlet end of the first oil pump is communicated with an oil return box, the first motor is connected and installed on the first oil pump, the first oil pump is controlled and started by the first motor in the oil supply process of the oil cylinder controlled by the servo valve, and partial flow of the oil inlet pipeline of the oil cylinder is released by the first oil.
2. The system for controlling the micro-movement of the oil cylinder according to claim 1, wherein the oil cylinder has a low level oil inlet pipe and a high level oil inlet pipe, two actuating oil ports of the servo valve are respectively connected with the low level oil inlet pipe and the high level oil inlet pipe, and the first oil pump is disposed on the low level oil inlet pipe of the oil cylinder.
3. The system for controlling the micro-movement of the oil cylinder according to claim 1, wherein the oil cylinder has a low level oil inlet pipe and a high level oil inlet pipe, two actuating oil ports of the servo valve are respectively connected with the low level oil inlet pipe and the high level oil inlet pipe, and the two first oil pumps are respectively disposed on the low level oil inlet pipe and the high level oil inlet pipe.
4. The system for controlling the minute movement of the oil cylinder according to any one of claims 1 to 3, characterized by further comprising: oil tank, second oil pump and second motor, the oil inlet of oil tank, exit end connection servovalve is connected to the entry end of second oil pump, and the second motor is connected and is installed on the second oil pump, and the second motor cooperation second oil pump provides hydraulic oil for this system.
5. The system for controlling the micro-movement of the oil cylinder as claimed in claim 4, further comprising: and one end of the overflow valve is connected with the outlet end of the second oil pump, and the other end of the overflow valve is communicated with the oil return tank.
6. The system for controlling the micro-movement of the oil cylinder as claimed in claim 4, wherein the first and second motors are constant speed motors, servo motors or variable frequency motors.
7. The system for controlling the micro-movement of the oil cylinder as claimed in claim 4, wherein the first and second oil pumps are gear pumps, screw pumps, plunger pumps or vane pumps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921138467.7U CN210290327U (en) | 2019-07-19 | 2019-07-19 | Oil cylinder micro-movement control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921138467.7U CN210290327U (en) | 2019-07-19 | 2019-07-19 | Oil cylinder micro-movement control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210290327U true CN210290327U (en) | 2020-04-10 |
Family
ID=70103261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921138467.7U Active CN210290327U (en) | 2019-07-19 | 2019-07-19 | Oil cylinder micro-movement control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210290327U (en) |
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2019
- 2019-07-19 CN CN201921138467.7U patent/CN210290327U/en active Active
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