CN1099854A

CN1099854A - Actuactor

Info

Publication number: CN1099854A
Application number: CN93117081.8A
Authority: CN
Inventors: 迈克尔·A·卡尔弗特; 克里斯托弗·P·希弗
Original assignee: Prime Actuator Control Systems Ltd
Current assignee: Prime Actuator Control Systems Ltd
Priority date: 1992-05-02
Filing date: 1993-09-01
Publication date: 1995-03-08
Also published as: NO932971L; CA2108109A1; NO932971D0; EP0569211A1

Abstract

An actuator which can transform rectilineal motion into revolutional motion includes a pressure cavity for holding working fluid, an actuator shell having longitudinal groove inside, a frame-shaped yoke mounted in the shell, a shaft passing through longitudinal groove into frame-shaped yoke, a pushing rod mounted on the shaft in frame-shaped yoke, a restoring device for resisting the pressure of working fluid, and a manual device for releasing the force stored in the actuator, once the actuator has trouble.

Description

Actuactor

What the present invention relates to is a kind of actuator, and what relate in particular to is a kind of valve formula actuator by pneumatic gas or hydraulic pressure installation operation, becomes angular motion in this valve formula actuator cathetus movement conversion.For many years, in the industrial field of valve formula actuator, make translational forces and linear motion convert specified " dog link " (scotch yoke) mechanism that is the rotating force of 90 degree to the maximum and rotatablely moves to by mechanical advantage and be subjected to extensive use.Purpose of the present invention just is the improvement to this valve actuator.

When valve actuator is driven by pressure source, require to be provided with the hand-operating device that the user selects.This device can allow operator by direct manually operated device desired rotation angle be arrived in valve regulation, and does not need normal extra power.This function is finished by multiple device according to the required moment size of valve actuator.

Generally speaking, big actuator by hydraulic pressure installation and intermediate module by mechanical device, be often referred to by hand wheel, reduction gear or other device that can increase manually input and carry out manually-operable, and smaller actuator directly carries out work by the input of jack.In industry, the estimation of artificial maximum, force is generally 36.32 kilograms (80 pounds) in this career field.

Hydraulic manual system in the above-mentioned known devices has one can produce the hand pump that enough pressure rotates valve.This system complex, the manufacturing price costliness, and be generally used for requiring the place of very big power.

Make the manual gear device send at double manual force by the hand wheel that is connected to the actuator torque generating means by gear.Thereby operation just can make the valve rotation during hand wheel.

The screw jack manual operating device has a thread spindle, and this can directly be contained in the ram of actuator, and axle rotation is screwed in the actuator, so just can produce the longitudinal movement that can make the piston that valve rotates.There are pressure type or non-pressurised type in this system.

There is a hard-wired screw jack that is used for ram in the system of being pressurised into.Because can allow operator that jack is sent in the pressurized cylinder, this structure is with regard to more complicated.For this reason, system is necessary for the compression energy the big ventilation/path of giving vent to anger is provided, or the manual operating device case design must be become can bear working pressure.In many cases, the actuator in this atmosphere is directly by gas-operated, and this gas can cause the serious corrosion that impels gear to be easy to wear and tear.

The non-pressure system requires the outer end plate of an obstruction from cylinder moved down usually.In case move down, the respective threaded that the screw jack that above-mentioned threaded termination is hexahedron or analogous shape is installed in the end plate of cylinder puts.Because to the thrust that piston assembly produced of actuator, the rotation of jack just causes the rotation of valve, this thrust has just replaced the common compression energy.The shortcoming of this system is to move lower cylinder body to obstruction, does danger close like this, and both inapplicable or also improper.

Purpose of the present invention is exactly to overcome or alleviate the problem relevant with above-mentioned known devices at least.

According to an aspect of the present invention, provide a kind of and straight line motion can have been converted to the actuator that rotatablely moves, this actuator comprises: the pressure chamber that holds working fluid; Have the actuator casing of cannelure in it; Be contained in the shaped as frame york piece in the housing; By cannelure enter in the shaped as frame york piece the axle; Be contained in the push strut on the axle in the shaped as frame york piece; Resist the recovery device of working fluid pressure and allow and be stored in the manual operating device that the power in the actuator can obtain discharging when in a single day actuator breaks down.

Axle preferably can longitudinally slide in groove.

For simplicity, recovery device has a spring in the spring module that is contained on the actuator housings, and this spring module operationally links to each other with axle.

Manual operating device preferably has a safety installations, has the hook-like part that is contained on the spring module, this device to open each corresponding hole of matching with these hook-like parts in addition in this safety installations on housing.

This manual operating device preferably is useful on manual tune this actuator hand wheel or wrench device.

Now with example embodiments of the invention are described in conjunction with the accompanying drawings.In the drawings:

Fig. 1 is the schematic representation according to the actuator of one aspect of the invention;

Figure 1A is the sectional drawing according to the actuator of one aspect of the invention;

Figure 1B is the cross-section profile of the actuator of Figure 1A;

Fig. 2 is the schematic representation of the spring cabin module of Fig. 1 actuator;

Fig. 3 is another schematic representation of the spring cabin module of Fig. 1;

Fig. 4 is the side view of plate face of the module of Fig. 2;

Fig. 5 is the view of plate face when opening of Fig. 4;

Fig. 6 is the view of plate face when closing of Fig. 4.

Back referring to accompanying drawing, actuator has a housing 1 now, and the hollow space 2 through mach longitudinal moment tee section is arranged in this housing.The shaped as frame york piece 3 of a known type is contained in vertical hollow section slidably.This shaped as frame york piece 3 can directly be bearing in the housing 1, also can load onto bearing on the smooth surface between shaped as frame york piece 3 and the housing 1.In addition, shaped as frame york piece 3 can be made up of shown in Fig. 1 dotted line or two boards.

A pair of transmission shaft A, B are contained in the rectangular section of hollow slidably.These two axles (axle shown in Figure 1A) are connected with the piston of actuator, vertically move in rectangular section under their fluid pressure action in the actuator pressure chamber.Cardan-shaft suspension is in cannelure, and under any circumstance they all contact with the surface of bearing.Because axle is bigger with the area of contact of bearing, is subjected to low-down supporting force so just guaranteed actuator.

In shaped as frame york piece 3, a push strut 4 is arranged, the installation of this bar makes it can quite cooperate with the arm of shaped as frame york piece.This push strut 4 is contained in by in axle A and transverse holes of B, and for example this push strut can be a bar and a block mechanism.This mechanism is a kind of device that can produce the rotation output movement according to actuator.

With link or screwed connecting rod 6 spring cabin module 5 is linked to each other with actuator casing 1.Not shown among screwed transmission shaft 7(Figure 1A) longitudinally be contained on the end plate in spring cabin.Axle 7 can rotate but can not be along the longitudinal movement.Axle 7 can for example at needle roller/ball bearing, rotate on thrust button or other the similar low frictional torque bearings 8 at low rubbing device.Can outside plate, utilize hand wheel 9 or other forms of wrench device 10 that axle is rotated.When requiring to select than direct manual pushing force (because product and/or the industrial runner that can allow or spanner cover are restricted the size of runner 9 or spanner in generation, for example their suffered power is 36.32 kilograms of output pushing forces that (80 pounds) are big, will adopt external means, for example toothed chain driving belt or other device, also can finish with an input shaft, this axle vertically is provided with, and also can become unspecified angle with the longitudinal axis of actuator.

With proper device manual push part or positioning element and path are on every side separated, a locking device can be installed prevent that hand screw from uncontrollable rotation taking place.

The inner of screwed axle 7 enter in the shaped as frame york piece 3 and be screwed into the second pushing nut 4 ' in, and this nut is fixed, it can not rotate with shaped as frame york piece 3.By circlip, cotter pin or roll pin and prevent that axle 7 screw thread from throwing off.

Spring cabin module 5 mainly contains by the stored energy of pressure spring 12, also can be installed in the assembly other for power apparatus.

A safety installations links to each other with the faying surface of spring cabin module 5 and actuator casing 1, this safety installations has a fixing device, when spring force produced, connector was malfunctioning or will still be fixed on spring cabin module on the actuator casing by safety installations when being disassembled.

Have two or more through holes 14 on the end face 13 of housing 1, can reach these through holes from the inboard of housing end face.Two or more hook-like means 15 are equipped with in the front of the installation header board of spring cabin module, and the end of each hook-like means 15 has the size of its diameter can enter latch 16 in the hole 14 of actuator movingly.

The assembling of unit can make fixing device enter in the housing 1 of actuator, and can forward 14 and 16 alignment that make the maintenance connector to.As when alignment marquis, the hook-like part 15 of safety installations directly is placed on the internal surface inlet top in hole 14 by the housing end face, and leaves this inlet a little.

The working principle of this device is as follows: for the proper functioning of the actuator that adopts pressure source, the device that manual operating device will have an invalid longitudinal movement remains on stand as shown in Figure 5, and this motion is because allow the inner of rectangle pushing face of shaped as frame york piece 3 move and cause along not rotating hand screw axle 7.The rotation of hand wheel 9, other of the transmission of spanner or operator operation are rotated input devices and are made manual pushing nut 4 ' tighten towards the inner of spline shaped as frame york piece 3, and actuator is rotated.

In the actuator rotation process, spring is subjected to the pressure opposite with the actuator direction, and the rotation of actuator is to be produced by the rotation of hand wheel 9.The counter-rotation of hand screw slewing gear makes pressure spring power be released, thereby causes that actuator rotates.

Common fixing device malfunctioning or come off with spring cabin module 5 of stored energy can cause that this cabin is from actuator casing 1 moving outwardly.During this action, the latch on the hook-like part 15 of safety installations enters hole 14, thereby makes location, spring cabin.Other advantage of secure context is that this device can not only disconnect because rotate.

Above-mentioned device is used for the single-acting device, but it also can become the double-action device by adopting force application device, and this force application device adopts an end of shaped as frame york piece 3 or the other end are pushed away or draw.

The advantage of this device is that this installation weight is light, and structure is very simple.It can not connect in slippage, and the possibility of blocking is extremely low.It all is not connected with any pressure source, thus do not need under the moving of obstruction, thus during manually-operable, when the authorized pressure source is to actuator operated again operator there is not danger.

Certainly, though preferred embodiment of the present invention description is that spring maintenance module and manual safety device are arranged, embodiments of the invention also can be designed to not have the spring fixing device.

Claims

1, a kind ofly straight line motion can be converted to the actuator that rotatablely moves and comprise: a pressure chamber that holds working fluid; The actuator casing that cannelure is arranged in it; A shaped as frame york piece that is contained in the housing; An axle that enters the shaped as frame york piece by cannelure; One be contained in the shaped as frame york piece the axle on push strut; The recovery device of opposing working fluid pressure and away from pressure chamber, allow be stored in the manual operating device that the power in the actuator can obtain discharging when in a single day actuator break down.

2, according to the actuator of claim 1, the longitudinal sliding motion in groove of its axis.

3, according to the actuator of claim 1 or 2, wherein recovery device has a spring in the module that is contained on the actuator housings, and this module operatively links to each other with axle.

4, according to the actuator of claim 3, wherein manual operating device has a safety installations, has in this safety installations to be contained in the hook-like part on the spring module and to open each corresponding aperture that matches with these hook-like parts on housing.

5, according to the actuator of above-mentioned arbitrary claim, wherein manual operating device has a hand wheel or a wrench device that is used for manual actuator.