CN210290328U - Oil cylinder micro-movement control system - Google Patents
Oil cylinder micro-movement control system Download PDFInfo
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- CN210290328U CN210290328U CN201921138468.1U CN201921138468U CN210290328U CN 210290328 U CN210290328 U CN 210290328U CN 201921138468 U CN201921138468 U CN 201921138468U CN 210290328 U CN210290328 U CN 210290328U
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- oil
- servo valve
- oil cylinder
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Abstract
The utility model discloses a small mobile control system of hydro-cylinder, include: the oil cylinder, the first servo valve and the second servo valve are arranged, an execution oil port of the first servo valve is connected with an oil inlet pipeline end of the oil cylinder, the second servo valve is connected with the first servo valve in parallel, and partial flow of the oil inlet pipeline of the oil cylinder is released through an oil return port of the second servo valve in the oil supply process of the oil cylinder controlled by the first servo valve. The invention designs a certain leakage amount for the oil inlet pipeline of the oil cylinder, discharges redundant flow, reduces the oil inlet amount to meet the requirement of the oil cylinder, enables the oil cylinder to realize micro movement, and 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 first servo valve and the second servo valve are arranged, an execution oil port of the first servo valve is connected with an oil inlet pipeline end of the oil cylinder, the second servo valve is connected with the first servo valve in parallel, and partial flow of the oil inlet pipeline of the oil cylinder is released through an oil return port of the second servo valve in the oil supply process of the oil cylinder controlled by the first servo valve.
The oil cylinder is provided with a low-position oil inlet pipeline and a high-position oil inlet pipeline, and two execution oil ports of the first servo valve and the second servo valve are respectively connected with the low-position oil inlet pipeline and the high-position oil inlet pipeline.
And the oil inlet of the second servo valve is closed in the whole process.
The system further comprises: oil tank, oil pump and motor, the inlet end of oil pump inserts the oil tank, the oil inlet of first servo valve is connected to the exit end, and the motor is connected and is installed on the oil pump, and the motor cooperation oil pump provides hydraulic oil for this system.
The system further comprises: one end of the overflow valve is connected with the outlet end of the oil pump, and the other end of the overflow valve is communicated with the oil return tank.
The motor is a constant speed motor, a servo motor or a variable frequency motor.
The oil pump is a gear pump, a screw pump, a plunger pump or a vane pump.
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: the hydraulic oil cylinder comprises an oil cylinder 5, a first servo valve 4 and a second servo valve 6, wherein the first servo valve 4 is connected to an oil inlet pipeline of the oil cylinder 5, the first servo valve 4 controls the flow of hydraulic oil entering the oil cylinder 5, the second servo valve 6 is connected with the first servo valve 4 in parallel, the second servo valve 6 is started in the process that the first servo valve 4 supplies oil to the oil cylinder 5, and a part of the flow of the oil inlet pipeline of the oil cylinder 5 is released by the second servo valve 6. For example, the following steps are carried out: the minimum oil feeding amount of the first servo valve 4 is 90ml/s, when the oil feeding amount of the first 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 second servo valve 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 accuracy of the oil cylinder is improved accordingly.
In the present embodiment specifically: the system further comprises: oil tank 1, oil pump 2 and motor 3, oil tank 1 is used for the oil storage, and motor 3 connects and installs on oil pump 2, opens and close oil pump 2 by motor 3 control, and oil tank 1 is inserted to the entry end of oil pump 2, and the oil inlet P of first servo valve 4 is connected to the exit end of oil pump 2, and motor 3 cooperation 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 7 is connected with the outlet end of the oil pump 2, one end of the overflow valve 7 is communicated with the oil return tank 8, and the overflow valve 7 is used for controlling the highest pressure of the oil discharged by the oil pump 2 so as to protect the whole hydraulic system from overpressure.
The first servo valve 4 is used for controlling the oil supply flow of the oil cylinder 5, the first servo valve 4 is a standard component and is provided with four interfaces, namely an oil inlet P, an oil return port T leading to the oil return tank 8 and two execution oil ports A and B which can be connected with an oil inlet pipeline, and 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.
The second servo valve 6 has the same connection structure as the first servo valve 4, but is used differently in that the second servo valve 6 is not used for controlling the supply flow rate but for partially draining the supply flow rate. For example, when the medium function is set, the four ports are closed, and the second servo valve 6 does not participate in oil drainage; when the left-position function is set, only TA is connected, and when the right-position function is set, only TB is connected, and only oil is discharged and not supplied.
When the first servo valve 4 and the second servo valve 6 are specifically connected with the oil cylinder 5, the oil cylinder 5 can be divided into two most common installation conditions:
in one embodiment, the cylinder 5 has two oil inlet pipes, a low-level oil inlet pipe and a high-level oil inlet pipe, and the two actuating oil ports a and B of each servo valve are connected to the low-level oil inlet pipe and the high-level oil inlet pipe, respectively. When the oil cylinder 5 works, when the first 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 8 through ｃA high position oil inlet pipeline-B-T, the oil cylinder 5 is driven to move towards one direction at the moment, the second servo valve 6 needs to be in ｃA left position function at the moment, and redundant flow is released through the low position oil inlet pipeline to play ｃA role in micro-movement control; when the first servo valve 4 is in the left position function, hydraulic oil enters the upper end of the oil cylinder 5 through a P-B-high position oil inlet pipeline, the lower end hydraulic oil returns to the oil return tank 8 through a low position oil inlet pipeline-A-T, the oil cylinder 5 is driven to move in the other direction, the second servo valve 6 needs to be in the right position function, redundant flow is released through the high position oil inlet pipeline, and the function of micro-movement control is achieved;
in another mode, the oil cylinder 5 is only provided with one oil inlet pipeline, at the moment, the first servo valve 4 and the second servo valve 6 only need to start the corresponding left machine function or right machine function and are directly connected to the oil inlet pipeline, the first servo valve 4 controls oil supply, the second servo valve 6 releases redundant flow, and all movement of the oil cylinder 5 is controlled through hydraulic oil of one oil inlet pipeline.
It should be particularly noted that the motor 3 mentioned in this embodiment may also 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; the oil pump 2 mentioned in this embodiment can be specifically a gear pump, a screw pump, a plunger pump, a vane pump, etc., and can be applied to various types of oil pumps as long as they can achieve the same control effect.
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 first servo valve and the second servo valve are arranged, an execution oil port of the first servo valve is connected with an oil inlet pipeline end of the oil cylinder, the second servo valve is connected with the first servo valve in parallel, and partial flow of the oil inlet pipeline of the oil cylinder is released through an oil return port of the second servo valve in the oil supply process of the oil cylinder controlled by the first servo valve.
2. The system for controlling the micro-movement of the oil cylinder as claimed in claim 1, wherein the oil cylinder has a low position oil inlet pipe and a high position oil inlet pipe, and the two actuating oil ports of the first and second servo valves are respectively connected to the low position oil inlet pipe and the high position oil inlet pipe.
3. The oil cylinder micro-movement control system as claimed in claim 1, wherein the oil inlet of the second servo valve is closed all the way.
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, oil pump and motor, the inlet end of oil pump inserts the oil tank, the oil inlet of first servo valve is connected to the exit end, and the motor is connected and is installed on the oil pump, and the motor cooperation 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 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 motor is a constant speed motor, a servo motor or a variable frequency motor.
7. The system for controlling the micro-movement of the oil cylinder as claimed in claim 4, wherein the oil pump is a gear pump, a screw pump, a plunger pump or a vane pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921138468.1U CN210290328U (en) | 2019-07-19 | 2019-07-19 | Oil cylinder micro-movement control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921138468.1U CN210290328U (en) | 2019-07-19 | 2019-07-19 | Oil cylinder micro-movement control system |
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| Publication Number | Publication Date |
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| CN210290328U true CN210290328U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921138468.1U Active CN210290328U (en) | 2019-07-19 | 2019-07-19 | Oil cylinder micro-movement control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242635A (en) * | 2019-07-19 | 2019-09-17 | 湖北万测试验设备有限公司 | A kind of oil cylinder minute movement control system |
-
2019
- 2019-07-19 CN CN201921138468.1U patent/CN210290328U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110242635A (en) * | 2019-07-19 | 2019-09-17 | 湖北万测试验设备有限公司 | A kind of oil cylinder minute movement control system |
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