CN206988215U - Pressure unloading control device - Google Patents
Pressure unloading control device Download PDFInfo
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- CN206988215U CN206988215U CN201720457464.4U CN201720457464U CN206988215U CN 206988215 U CN206988215 U CN 206988215U CN 201720457464 U CN201720457464 U CN 201720457464U CN 206988215 U CN206988215 U CN 206988215U
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- pressure
- branch road
- load branch
- foil gauge
- oil pump
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Abstract
This patent is related to hydraulic means field, disclose a kind of pressure unloading control device, including prime mover, working connection, fuel tank and oil pump, prime mover is connected with oil pump, the outlet working connection of oil pump, working connection is provided with off-load branch road, off-load branch road connects fuel tank, off-load branch road is provided with unloading valve, also include pressure acquisition device and PLC module, pressure acquisition device is arranged on the off-load branch road between working connection and unloading valve, pressure acquisition device includes the deformation capsule and foil gauge that can be plastically deformed, deformation capsule inner hollow, deformation capsule connects with off-load branch road, foil gauge is arranged in the side wall of deformation capsule, foil gauge, unloading valve and frequency converter are electrically connected with PLC module, PLC module is provided with touch display screen.This patent is intended to control the pressure unloading in hydraulic system, extends the service life of hydraulic system.
Description
Technical field
It the utility model is related to hydraulic means field.
Background technology
In hydraulic system, as long as motor（Or other prime mover）Rotate, oil pump will continue to produce pumping pressure, to master
Pumping pressure oil in oil circuit.And when the load of hydraulic system connection is failure to actuate, it is not necessary to pressure oil, the pressure oil that oil pump pumps out
Have nowhere to go, fuel tank can only be returned to by overflow valve, now overflow valve caloric value is very big, and lasting high pressure can also be damaged
Oil pump and hydraulic valve.Release oil return box that now must be hydraulic oil by off-load branch road no pressure, this action are just named（Oil
Pump）Off-load.
In off-load, due to the suddenly change of pressure, enormous impact will be produced to the valve in hydraulic circuit, influence valve
The service life of door.In the prior art, although oil pump is controlled using variable pump before off-load to pressure unloading, reduce in advance
Pressure, although can alleviate this problem, variable pump is complicated, and price is high, and maintenance cost is also high, and noise is big.
Utility model content
The utility model is intended to provide a kind of pressure unloading control device, to control the pressure unloading in hydraulic system.
Pressure unloading control device in this programme, including prime mover, working connection, fuel tank and oil pump, prime mover and oil pump
Connection, the outlet working connection of oil pump, working connection are provided with off-load branch road, and off-load branch road connects fuel tank, set on off-load branch road
There is a unloading valve, described prime mover is the variable-frequency motor with frequency converter, in addition to pressure acquisition device and PLC module, pressure acquisition
Device is arranged on the off-load branch road between working connection and unloading valve, and pressure acquisition device includes the deformation that can be plastically deformed
Capsule and foil gauge, deformation capsule inner hollow, deformation capsule are connected with off-load branch road, and foil gauge is arranged in the side wall of deformation capsule, should
Become piece, unloading valve and frequency converter to be electrically connected with PLC module.
The technical principle of this programme and have the beneficial effect that：Pressure unloading is preset in PLC module.Start variable-frequency motor, become
Frequency motor driven oil pump rotates, the discharge pressure oil into working connection and off-load branch road.Pressure oil in off-load branch road enters shape
Become in capsule, deformation capsule expands in the presence of pressure oil oil pressure, and oil pressure is higher, and the deformation quantity of deformation capsule is bigger.And foil gauge is
A kind of testing tool for being used for measuring object strain, becomes piece and is made up of insulating substrate and metal sensitive grid, when unit under test is by outer
During force deformation, sensitive grid also deforms therewith, therefore the resistance value of sensitive grid can produce corresponding change.Unloaded when oil pressure reaches default
During lotus pressure, the deformation of deformation capsule reaches extreme value, and the resistance of foil gauge also reaches extreme value, and PLC module turns the resistance of foil gauge
Change electric signal into, and electric signal be input in frequency converter and unloading valve, while control variable-frequency motor slow down, reduce working connection and
Oil pressure in off-load branch road, while control unloading valve opens release.
Further, the deformation capsule is in spindle, and the foil gauge is arranged on the middle part of deformation capsule.Fusiform deformation capsule
The diameter at middle part is more than the diameter at both ends, causes deformation capsule in expansion, and the type variable in the middle part of it is more than the type variable at both ends, then
Foil gauge is arranged on to the middle part of deformation capsule, more conducively delicately tests out the deflection of deformation capsule, and then more delicately sense
Oil pressure.
Further, the oil pump is quantitative oil pump.Compared with variable pump, constant displacement pump is simpler, and noise is smaller.In this programme
Oil pressure is reduced using the rotating speed for reducing variable-frequency motor, and effect is identical with using variable pump.
Further, the unloading valve is two-position two-way solenoid valve.Two-position two-way solenoid valve can electrically connect with PLC module,
It can quickly commutate, thus be easy to be combined to complete release with PLC module.
Further, the quantity of the foil gauge is at least three, and foil gauge is circumferentially distributed on the deformation capsule outer surface
On.The resistance of foil gauge depend on itself type variable and deformation capsule deformation quantity, foil gauge may itself existing defects and make
Error be present into resistance, the type variable of deformation capsule may also have error because of the skewness of deformation, therefore use three
Individual above foil gauge, and foil gauge is uniformly distributed in the axial external surface of deformation capsule, can use when measuring deformation should
Become the average value of piece measured values, reduce systematic error.
Further, in addition to touch display screen, touch display screen electrically connect with PLC module.Touch display screen can be more directly perceived
Ground carries out input-output operation, default pressure unloading of being more convenient for, man-machine interaction of being more convenient for.
Brief description of the drawings
Fig. 1 is the hydraulic circuit figure of the utility model embodiment pressure unloading control device；
Fig. 2 is the electrical connection schematic diagram of PLC module.
Embodiment
The utility model is described in further detail below by embodiment：
Reference in Figure of description includes：Variable-frequency motor 1, quantitative oil pump 2, working connection 3, fuel tank 4, off-load branch road
5th, unloading valve 6, touch display screen 7, PLC module 8, deformation capsule 9, foil gauge 10.
Embodiment
Pressure unloading control device is substantially as shown in Figure 1：Including variable-frequency motor 1, working connection 3, fuel tank 4 and quantitative oil pump
2, variable-frequency motor 1 is connected with quantitative oil pump 2, the outlet working connection 3 of quantitative oil pump 2, and working connection 3 is provided with off-load branch road 5,
Off-load branch road 5 connects fuel tank 4, and off-load branch road 5 is provided with unloading valve 6, in addition to pressure acquisition device, touch display screen 7 and PLC
Module 8, pressure acquisition device are arranged on the off-load branch road 5 between working connection 3 and unloading valve 6, and pressure acquisition device includes can
The deformation capsule 9 being plastically deformed and four foil gauges 10, deformation capsule 9 are in the inner hollow of spindle deformation capsule 9, deformation capsule 9 with
Off-load branch road 5 is connected, and foil gauge 10 is circumferential to be distributed on the outer surface of deformation capsule 9, foil gauge 10, unloading valve 6, touch display screen 7
It is electrically connected with the frequency converter of variable-frequency motor 1 in PLC module 8, the electrical connection schematic diagram of PLC module 8 is as shown in Figure 2.
Pressure unloading is preset in PLC module 8 by touch display screen 7.Start variable-frequency motor 1, variable-frequency motor 1 drives fixed
Dispensing pump 2 rotates, the discharge pressure oil into working connection 3 and off-load branch road 5 of quantitative oil pump 2.Pressure oil in off-load branch road 5 enters
Into deformation capsule 9, deformation capsule 9 expands in the presence of pressure oil oil pressure, and oil pressure is higher, and the deformation quantity of deformation capsule 9 is bigger.Four
Foil gauge 10 is in the type variable maximum of deformation capsule 9, and the tissue of foil gauge 10 becomes with the change of the type variable of deformation capsule 9
Change, the resistance of foil gauge 10 is converted to electric signal by PLC module 8（Take the average value of four resistances of foil gauge 10）, PLC module 8
Electric signal is visually displayed in touch display screen 7.When oil pressure reaches default pressure unloading, PLC module 8 sends a letter
Number into frequency converter and unloading valve 6, while control variable-frequency motor 1 slows down, the oil pressure in working connection 3 and off-load branch road 5 is reduced, one
Side control unloading valve 6 opens release.
Above-described is only embodiment of the present utility model, and the general knowledge such as known concrete structure and characteristic is herein in scheme
Do not describe excessively.It should be pointed out that for those skilled in the art, the premise of the utility model structure is not being departed from
Under, several modifications and improvements can also be made, these should also be considered as the scope of protection of the utility model, and these are all without influence
The effect and practical applicability that the utility model is implemented.This application claims protection domain should be with the content of its claim
It is defined, the record such as embodiment in specification can be used for the content for explaining claim.
Claims (6)
1. pressure unloading control device, including prime mover, working connection, fuel tank and oil pump, prime mover are connected with oil pump, oil pump goes out
Mouth connection working connection, working connection are provided with off-load branch road, off-load branch road connection fuel tank, and off-load branch road is provided with unloading valve, and it is special
Sign is：Described prime mover is the variable-frequency motor with frequency converter, in addition to pressure acquisition device and PLC module, pressure acquisition dress
Put on the off-load branch road between working connection and unloading valve, pressure acquisition device includes the deformation capsule that can be plastically deformed
And foil gauge, deformation capsule inner hollow, deformation capsule connect with off-load branch road, foil gauge is arranged in the side wall of deformation capsule, strain
Piece, unloading valve and frequency converter are electrically connected with PLC module.
2. pressure unloading control device according to claim 1, it is characterised in that：The deformation capsule is in spindle, described
Foil gauge is arranged on the middle part of deformation capsule.
3. pressure unloading control device according to claim 1, it is characterised in that：The oil pump is quantitative oil pump.
4. pressure unloading control device according to claim 1, it is characterised in that：The unloading valve is bi-bit bi-pass electromagnetism
Valve.
5. pressure unloading control device according to claim 1, it is characterised in that：The quantity of the foil gauge is at least three
Piece, and foil gauge is circumferentially distributed on the deformation capsule outer surface.
6. pressure unloading control device according to claim 1, it is characterised in that：Also include touch display screen, touch aobvious
Display screen electrically connects with PLC module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720457464.4U CN206988215U (en) | 2017-04-27 | 2017-04-27 | Pressure unloading control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720457464.4U CN206988215U (en) | 2017-04-27 | 2017-04-27 | Pressure unloading control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206988215U true CN206988215U (en) | 2018-02-09 |
Family
ID=61391844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720457464.4U Expired - Fee Related CN206988215U (en) | 2017-04-27 | 2017-04-27 | Pressure unloading control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206988215U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109334933A (en) * | 2018-11-16 | 2019-02-15 | 中国船舶重工集团公司第七0四研究所 | The bidirectional locking arrangement of controllable pitch propeller of low hydraulic shock |
-
2017
- 2017-04-27 CN CN201720457464.4U patent/CN206988215U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109334933A (en) * | 2018-11-16 | 2019-02-15 | 中国船舶重工集团公司第七0四研究所 | The bidirectional locking arrangement of controllable pitch propeller of low hydraulic shock |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180209 Termination date: 20190427 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |