CN107917117A

CN107917117A - A kind of mechanical hydraulic servo cylinder

Info

Publication number: CN107917117A
Application number: CN201610886674.5A
Authority: CN
Inventors: 张利
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-10-11
Filing date: 2016-10-11
Publication date: 2018-04-17

Abstract

The invention discloses a kind of mechanical hydraulic servo cylinder, it includes cylinder body, piston rod, cylinder bottom, cylinder head, motor, cored screw bar, spool, valve pocket, guide runner, oil return opening, oil inlet, leads to back cavity oil circuit, logical oil circuit composition in area's to be allocated, when motor rotation driving cored screw bar rotary motion, band movable valve plug are for linear motion, valve port is opened, piston rod tracks valve core movement under the action of hydraulic fluid pressure, and closed loop is formed with valve port opening.So only need to control the direction of rotation of motor, rotating speed, corner, be achieved that the direction of motion, speed, position of control piston bar.

Description

A kind of mechanical hydraulic servo cylinder

Technical field

Invention belongs to fluid operating system regions, specifically, more particularly to a kind of high frequency sound, big flow, long stroke , while there is accurately speed, a kind of mechanical hydraulic servo cylinder of position control.

Background technology

Fluid cylinder, which is used to drive, to be positioned, and is widely used and is developed in industrial circle, hydraulic cylinder is only used as letter Single executive component, its accurate speed control and position control, generally using Hydraulic Servo Control Technology.Installation oil cylinder position Displacement sensor, by the physical location of sensor detection oil cylinder, speed signal, gives controller, controller is adjusted by computing, output The valve port opening of signal control servo valve is saved, so as to change the change of its flow, reaches control cylinder position, the purpose of speed. This set system price is high, and debugging is difficult, and contamination resistance is poor.Traditional servo valves, nozzle-flapper servo valve will to oil cleanliness Ask higher, generally require cleannes to reach NAS5-6 grades.It is easy to nozzle flapper plugging fault occur.Mechanical hydraulic servo cylinder is with motor For driving source, there is no the structure easy to pollute to be throttled with nozzle, therefore contamination resistance greatly improves.The high-end servo of existing market Control technology in order to pursue the speed of higher, position control accuracy and the arithmetic speed of controller is continuously improved（Millisecond）And servo The high frequency of valve is corresponding（500Hz）.And in high-volume hydraulic servo-control system, big flow will certainly increase valve core of servo valve Diameter, increases the inertia force of valve core movement, so as to reduce the frequency response of servo valve.Current high-end servo valve is by institute of offshore company ridge It is disconnected.The quality of domestic servo valve lags behind imported product always, the serious development for restricting Chinese hydraulic pressure industry.Therefore study a kind of High frequency sound, big flow, long stroke, while have accurately that speed, the servoBcylinder of position control are extremely urgent.

The content of the invention

The present invention be directed to problem present in traditional servo control technology, invention has high frequency sound, big flow, long row Journey, while there is accurately speed, a kind of mechanical hydraulic servo cylinder of position control.

The present invention is achieved in that a kind of mechanical hydraulic servo cylinder, it includes cylinder body, piston rod, cylinder bottom, cylinder head, motor, sky Heart screw rod, spool, valve pocket, guide runner, oil return opening, oil inlet, leads to back cavity oil circuit, leads to one of oil circuit composition in area's to be allocated Entirety, the cylinder head, cylinder bottom are fixed on cylinder barrel both sides, and the piston rod is arranged in the inner wall of cylinder barrel, by inner cavity of cylinder It is divided into rod chamber and rodless cavity.Rodless cavity is partitioned into a part of region bar inner cavity by spool, valve pocket again.

Especially, there is rank of presenting a theatrical performance as the last item on a programme on spool, the unbalanced force on balance valve core.

Especially, guide runner is fixed with spool, and it prevents spool from producing rotary motion, only produces rectilinear movement.

Especially, there is internal thread on spool, there is external screw thread on cored screw bar, the external screw thread of cored screw bar and spool Internal thread forms screw pair.

Especially, to be hollow inside cored screw bar, it connects fuel tank by cylinder bottom oil return opening.

Especially, cored screw bar is connected through cylinder bottom with motor.

Especially, the motor is stepper motor, servomotor.

Beneficial effects of the present invention are that the screw pair of cored screw bar and spool composition can realize long stroke, large pitch, Spool and piston rod direct position closed loop feedback, simple in structure, frequency response is high, and gain is big.Realize oil cylinder high frequency sound, big flow, Long stroke, while there is accurately speed, position control.

Brief description of the drawings

Fig. 1 is a kind of typical structure schematic diagram of mechanical hydraulic servo cylinder of the present invention.

In figure：1- motors；2- cored screw bars；3- spools；4- guide runners；5- valve pockets；6- leads to back cavity oil circuit；7-, which leads to, to be treated Subregion oil circuit；8- high pressure oils treat subregion；9- hollow piston rods；10- cylinder heads；11- cylinder bodies；12- cylinder bottoms；13- oil cylinder back cavities；14- Oil cylinder ante-chamber；15- oil return openings；16- oil inlets；17- bars inner cavity.

Embodiment

The present invention is described in further detail below in conjunction with attached drawing：

In the present invention, there is internal thread on spool 3, screw pair is formed by external screw thread and with spool 3 on cored screw bar 2.It is hollow The inside of screw rod 2 is hollow, it connects fuel tank by oil return opening 15 on cylinder bottom 12.Guide runner 4 is fixed with spool 3, and it makes valve Core cannot produce rotary motion, only produce rectilinear movement.

When oil cylinder connects oil sources, high pressure oil treats that the entrance of subregion oil circuit 7 is treated through the entrance oil cylinder of oil inlet 16 ante-chamber 14 by logical High pressure oil treats subregion 8.1 rotation driving cored screw bar of motor, 2 rotary motion, band movable valve plug 3 it is for linear motion, when spool 3 to When moving left, valve port is opened, the high pressure oil in high pressure oil area 8 to be allocated connects oil cylinder back cavity 13 through valve port, logical back cavity oil circuit 6, because 13 area of oil cylinder back cavity is more than oil cylinder ante-chamber area 14, and piston rod 9 is under the effect of the pressure to left movement, until valve port is closed. When spool 3 moves right, valve port is opened, 13 high pressure oil of oil cylinder back cavity is through logical back cavity oil circuit 6, valve port, bar inner cavity 17, hollow spiral shell The hollow connection oil return opening 15 of swing arm 2, piston rod 9 move right under the action of 14 high pressure oil of oil cylinder ante-chamber, until valve port closes Close.

If motor continuously rotates, when making spool 3 lasting to left movement, then piston rod 9 is persistently tracked constantly to left movement Spool 3.It is conversely, also identical.So only need to control the direction of rotation of motor, rotating speed, corner, be achieved that control piston bar Movement direction, speed, position.

Claims

1. a kind of mechanical hydraulic servo cylinder, including cylinder body 11, hollow piston rod 9, cylinder bottom 12, cylinder head 10, motor 1, and each runner With oil inlet and oil return mouth, it is characterized in that further include hollow screw bar 2, spool 3, valve pocket 5, guide runner 4, oil return opening 15, oil inlet 16, Logical back cavity oil circuit 6, leads to area's oil circuit 7 to be allocated.

2. valve pocket 5 is fixed as an entirety with hollow piston rod 9, hollow piston rod 9 is only for linear motion in cylinder body 11, is oriented to Sliding block 4 is fixed on spool 3, its lean out end can in the sliding slot of valve pocket 5 Yanzhong sky piston rod movement direction linear slide.

3. cored screw bar 2 forms screw pair with spool 3, the head of hollow piston rod 9 is connected through cylinder bottom 12 with motor 1.

4. the boss acted among spool 3 for the sealing and switching of oil circuit, high pressure oil enter oil cylinder ante-chamber 14 through oil inlet 16, after Treat that subregion oil circuit 7 treats subregion 8 into high pressure oil through logical, it is to be allocated.

5. motor 1 rotates hollow screw bar 2, band movable valve plug 3 moves under the action of guide runner 4, switches oil circuit.

6. oil return is flowed through the hollow of hollow screw bar 2, through 12 oil return line of cylinder bottom, is returned from oil return opening 15 by bar inner cavity 17 Oil.

7. mechanical hydraulic servo cylinder according to claim 1, it is characterised in that cored screw bar 2, spool 3 form screw pair, with Guide runner 4 coordinates, and the rotary motion of cored screw bar 2 is converted into the linear motion of spool 3.

8. mechanical hydraulic servo cylinder according to claim 2, for its feature in outer threaded hollow screw rod 2, the screw thread of spool 3 can be with It is screw thread, can be leading screw, can is ball-screw.

9. mechanical hydraulic servo cylinder according to claim 1, it is characterised in that motor 1 is stepper motor or servo electricity Machine.

10. mechanical hydraulic servo cylinder according to claim 1, it is characterised in that fluid media (medium) can be that various liquid or gas are situated between Matter.

11. mechanical hydraulic servo cylinder according to claim 1, it is characterised in that valve pocket 5, can be independent valve pocket, can also Directly it is process on hollow piston rod 9.

12. mechanical hydraulic servo cylinder according to claim 1, it is characterised in that guide runner 4, can be fixed on spool 3, its End is leant out to slide in the sliding slot of valve pocket 5.

13. can also be fixed on valve pocket 5, it leans out end and is slided in the sliding slot of spool 3.