CN207297964U - The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated - Google Patents
The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated Download PDFInfo
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- CN207297964U CN207297964U CN201721107179.6U CN201721107179U CN207297964U CN 207297964 U CN207297964 U CN 207297964U CN 201721107179 U CN201721107179 U CN 201721107179U CN 207297964 U CN207297964 U CN 207297964U
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- valve pocket
- valve
- screw
- spool
- ball
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Abstract
The utility model discloses the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated, its servomotor spindle is connected with screw rod, the screw rod other end and spool screw-internal thread fit, spool is in valve pocket, screw rod band movable valve plug slides axially along valve pocket, valve pocket is in valve body, spool lateral wall is equipped with multiple boss, valve pocket madial wall is equipped with and the corresponding groove of spool boss, spool and valve pocket, which coordinate, forms three-position four-way hydraulic valve, body wall is radially provided with and the corresponding oil circuit through hole of three-position four-way hydraulic valve, valve pocket is being equipped with internal thread and the cooperation of ball-screw external screw thread close to cylinder body end, valve pocket can slide axially under ball-screw drive along valve body, the ball-screw other end is flush-mounted in hollow piston rod, feed screw nut is arranged on the piston of piston rod.The utility model adds housing configuration on the outside of spool, by the servo-actuated position dynamical feedback for realizing hydraulic cylinder of valve pocket, so as to be disconnected the mechanical attachment of spool and ball-screw, improves the controllability of spool.
Description
Technical field
It the utility model is related to digital hydraulic technical field, and in particular to the machine feedback formula numeral that a kind of valve pocket can be servo-actuated
Hydraulic cylinder.
Background technology
Traditional Numeric hydraulic cylinder is divided into the valve core movement that step/servo motor directly drove and controlled hydraulic valve substantially,
It is equipped with the machine feedback structure that ball-screw is directly connected to spool, it is possible to achieve Direct Digital signal controls, and can reach
The position control accuracy of 0.01mm.But since spool one end couples with the output shaft of step/servo motor, the other end and liquid
The ball-screw connection of cylinder pressure, both ends can be subject to the motive force of step/servo motor and the feedback force of ball-screw at the same time, complete
It is not easy to realize the Dynamic Matching of motive force and feedback force in work period, have impact on the dynamic response of spool and hydraulic cylinder, also deposit
In failure hidden danger.
The content of the invention
For above-mentioned there are problem, the utility model proposes the machine feedback formula Numeric hydraulic cylinder knot that a kind of valve pocket can be servo-actuated
Structure, can solve the problems, such as the two of Numeric hydraulic cylinder spool to connecting firmly, and fundamentally improve the stressing conditions of spool, so that spool
Exercise performance is improved.
Technical solution is used by the utility model solves its technical problem：The machine feedback formula that a kind of valve pocket can be servo-actuated
Numeric hydraulic cylinder, including servomotor, screw rod, spool, valve pocket, valve body, ball-screw, feed screw nut, piston rod, cylinder body, are watched
The main shaft for taking motor is connected by shaft coupling with screw rod one end, and the screw rod other end is engaged with the internal thread of spool, and spool is embedded in
In in valve pocket, screw rod can slide axially with movable valve plug along valve pocket, and valve pocket is in valve body, and the lateral wall of spool is equipped with multiple convex
Platform, the madial wall of valve pocket are equipped with the corresponding groove of boss with spool, and spool and valve pocket, which coordinate, forms three-position four-way hydraulic valve,
Body wall be radially provided with the corresponding oil circuit through hole of three-position four-way hydraulic valve, valve pocket close to cylinder body end be equipped with internal thread with
The external screw thread of ball-screw one end is engaged, and valve pocket can slide axially under ball-screw drive along valve body, and ball-screw is another
End is flush-mounted in hollow piston rod, and feed screw nut is arranged on the piston of piston rod, and ball-screw can only rotate, the work
Stopper rod can only be translatable under the action of internal friction and outer load, can not rotate.
The utility model adds housing configuration on the outside of Numeric hydraulic cylinder spool, and hydraulic cylinder is realized in servo-actuated by valve pocket
Position dynamical feedback, so as to be disconnected the mechanical attachment of spool and ball-screw, improve the controllability of spool.This practicality is new
The spool of type is driven by servomotor and controlled, and valve pocket is driven by ball-screw and controlled, by feedback valve pocket and both spools phase
Control to movement, realizes the closed-loop digital control to Numeric hydraulic cylinder displacement.
Compared with conventional digital hydraulic cylinder, the utility model has following technical advantage：
(1) control system is simple
The feedback control of Numeric hydraulic cylinder is realized using high-precision ball-screw, and utilizes the opposite position of spool and valve pocket
Put the aperture size for carrying out control valve, it is not necessary to complicated control system, therefore the control system is relative to ordinary numbers hydraulic cylinder
It is simpler.
(2) reliability is high
Fed back in high precision using fully mechanical in digital hydraulic cylinder interior, substantially increase the internal drive of Numeric hydraulic cylinder
Reliability, make hydraulic cylinder works safe and reliable.
Brief description of the drawings
Fig. 1 is the structure diagram for the machine feedback formula Numeric hydraulic cylinder that valve pocket can be servo-actuated.
Fig. 2 is the partial enlarged view of Fig. 1.
Embodiment
The utility model is described further with reference to the accompanying drawings and embodiments：
As shown in Fig. 1~2, machine feedback formula Numeric hydraulic cylinder is by servomotor 1, shaft coupling 2, screw rod 3, spool 4, sealing
Circle 5, valve protecgulum 6, valve pocket 7, valve body 8, cylinder rear cover 9, sealing ring 10, bearing 11, ball-screw 12, feed screw nut 13, piston rod
14 and cylinder body 15 form.Servomotor 1 is used for return pulse signal and communicates rotational motion to screw rod 3, spiral shell by shaft coupling 2
The internal thread that bar 3 closes on 1 one end of servomotor with spool is engaged, and spool 4 is nested in valve pocket 7 and can slide axially, valve pocket 7
It is nested in valve body 8 and can slides axially, the valve pocket 7 is outer equipped with internal thread and with 12 one end of ball-screw close to cylinder body one end
Screw thread is engaged, and feed screw nut 13 is fixed on 14 one end of piston rod, and ball-screw 12 is nested in hollow piston rod 14, can only
Rotate.Piston rod 14 can only be translatable, not rotatably under the action of internal friction and outer load.8 both ends of valve body
Cylinder rear cover 9 and valve protecgulum 6 are fixedly connected with, cylinder rear cover 9 is connected with cylinder body 15, the cage connection of valve protecgulum 6 and servomotor 1.Cylinder
The rodless cavity end of body 15 is equipped with bearing, and bearing realizes axial restraint by cylinder body 15 and cylinder rear cover 9, only rotatable, for propping up
Support ball-screw.Valve body 8 is provided with axial cylindrical hole, for being embedded in valve pocket 7, the lateral wall of spool 4 be equipped with four boss c,
D, e, f, the madial wall of valve pocket 7 are equipped with four corresponding grooves of boss with spool, and spool 4 and valve pocket 7, which coordinate, forms three
Four-way hydraulic valve, 15 side wall of valve body are radially provided with and three-position four-way hydraulic valve corresponding oil circuit through hole A, B, T, P, body wall
Oil circuit via openings position at be equipped with the oil circuit open slot that axially expands, between each oil circuit open slot and oil circuit open slot
Do not connected mutually between valve body end face.The aperture of oil circuit open slot is 3 times of oil circuit through-hole diameter.
As shown in Fig. 2, spool 4 and valve pocket 7 coordinate in the three-position four-way hydraulic valve formed, valve pocket 7 and valve body 8 it is axial according to
Secondary arrangement corresponds to T, A, P, the oilhole and oil circuit of B interface, 4 corresponding A of spool, boss d, e and valve pocket 7 of B interface oilhole
Inner wall between surround with the P mouthfuls of cavitys connected, the inner wall between boss c and boss d, between boss e and boss f with valve pocket 7
Surround the cavity with T orifices.
The specific work process of the Numeric hydraulic cylinder of the utility model is as follows：Sent first by Numeric hydraulic cylinder control system
One pulse signal, starts to rotate after 1 return pulse signal of servomotor, because servomotor 1 passes through shaft coupling 2 and screw rod 3
Connection, and spool 4 closes on 1 one end of servomotor the internal thread for having and coordinating with screw rod 3 and cooperates, and spool 4 can only be axial
It is mobile, so screw rod 3 is moved axially with movable valve plug 4 under turning effort.If spool 4 is moved to the left, P mouthfuls and A mouthfuls even
Logical, B mouthfuls connect with T mouthfuls.High pressure oil at P mouthfuls, hydraulic cylinder rodless cavity is flowed into by A mouthfuls, rodless cavity supercharging, piston rod 14 to
Left movement, the oil of hydraulic cylinder rod chamber flow back to fuel tank by B mouthfuls, T mouthfuls.
When piston rod 14 is translatable to the left, drives and be fixed on feed screw nut 13 on piston rod 14 to left movement, ball screw
12 do not move in the axial direction, and ball screw 12 occurs with servomotor 1 to despining, because ball-screw 12 is on hydraulic valve
External screw thread and 7 screw thread of valve pocket it is matched, valve pocket 7 can move axially, therefore 12 valve pocket 7 of ball-screw is given birth under turning effort
Move axially and move right, valve port is closed, and a stepping process terminates.
Claims (5)
- A kind of 1. machine feedback formula Numeric hydraulic cylinder that valve pocket can be servo-actuated, it is characterised in that including servomotor, screw rod, spool, Valve pocket, valve body, ball-screw, feed screw nut, piston rod, cylinder body, the main shaft of servomotor are connected by shaft coupling and screw rod one end Connect, the screw rod other end is engaged with the internal thread of spool, and for spool in valve pocket, screw rod can be axially sliding along valve pocket with movable valve plug Dynamic, valve pocket is in valve body, and the lateral wall of spool is equipped with multiple boss, and the madial wall of valve pocket is equipped with opposite with the boss of spool The groove answered, spool and valve pocket, which coordinate, forms three-position four-way hydraulic valve, and body wall is radially provided with and three-position four-way hydraulic valve phase Corresponding oil circuit through hole, valve pocket are engaged close to cylinder body end equipped with internal thread with the external screw thread of ball-screw one end, and valve pocket exists Ball-screw can slide axially under driving along valve body, and the ball-screw other end is flush-mounted in hollow piston rod, and feed screw nut is set Put on the piston of piston rod, ball-screw can only rotate, the piston rod under the action of internal friction and outer load, It can only be translatable, can not rotate.
- 2. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 1 can be servo-actuated, it is characterised in that described Valve body both ends are fixedly connected with cylinder rear cover and valve protecgulum, and the cylinder rear cover is connected with cylinder body, outside the valve protecgulum and servomotor Shell connects.
- 3. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 2 can be servo-actuated, it is characterised in that described The rodless cavity end of cylinder body is equipped with bearing, and bearing realizes axial restraint by cylinder body and cylinder rear cover, only rotatable, is used to support rolling Ballscrew.
- 4. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 1 can be servo-actuated, it is characterised in that described The oil circuit open slot that axially expands is equipped with the oil circuit via openings position of body wall, between each oil circuit open slot and oil Do not connected mutually between road open slot and valve body end face.
- 5. the machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket according to claim 4 can be servo-actuated, it is characterised in that described The aperture of oil circuit open slot is 3 times of oil circuit through-hole diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721107179.6U CN207297964U (en) | 2017-08-31 | 2017-08-31 | The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721107179.6U CN207297964U (en) | 2017-08-31 | 2017-08-31 | The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207297964U true CN207297964U (en) | 2018-05-01 |
Family
ID=62438397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721107179.6U Expired - Fee Related CN207297964U (en) | 2017-08-31 | 2017-08-31 | The machine feedback formula Numeric hydraulic cylinder that a kind of valve pocket can be servo-actuated |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207297964U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109322874A (en) * | 2018-12-17 | 2019-02-12 | 湖北三江航天万山特种车辆有限公司 | A kind of high-precision processing position control hydraulic cylinder |
| CN113530917A (en) * | 2021-08-25 | 2021-10-22 | 长沙亿美博智能科技有限公司 | Digital hydraulic cylinder |
| CN116517904A (en) * | 2023-05-19 | 2023-08-01 | 东方电气自动控制工程有限公司 | Digital hydraulic servo control valve with closed-loop feedback |
-
2017
- 2017-08-31 CN CN201721107179.6U patent/CN207297964U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109322874A (en) * | 2018-12-17 | 2019-02-12 | 湖北三江航天万山特种车辆有限公司 | A kind of high-precision processing position control hydraulic cylinder |
| CN109322874B (en) * | 2018-12-17 | 2020-07-03 | 湖北三江航天万山特种车辆有限公司 | Position control hydraulic cylinder for high-precision machining |
| CN113530917A (en) * | 2021-08-25 | 2021-10-22 | 长沙亿美博智能科技有限公司 | Digital hydraulic cylinder |
| CN116517904A (en) * | 2023-05-19 | 2023-08-01 | 东方电气自动控制工程有限公司 | Digital hydraulic servo control valve with closed-loop feedback |
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| 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: 20180501 Termination date: 20210831 |
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| CF01 | Termination of patent right due to non-payment of annual fee |