CN2057484U

CN2057484U - Pneumatic actuator

Info

Publication number: CN2057484U
Application number: CN 89217678
Authority: CN
Inventors: 贾福民; 蒋伯雄; 张洪志; 蔡志
Original assignee: TIANJIN INSTRUMENT SPECIAL EQUIPMENT FACTORY
Current assignee: TIANJIN INSTRUMENT SPECIAL EQUIPMENT FACTORY
Priority date: 1989-10-07
Filing date: 1989-10-07
Publication date: 1990-05-23

Abstract

The utility model relates to a pneumatic actuator which is widely used for the adjustment process of the air door baffle plate and the valve of large scale equipment. The utility model comprises an automatic part and a hand-operated part, and the automatic part is the same as the prior art. The utility model is characterized in that the hand-operated part is a hydraulic hand-operated device composed of an oil cylinder, a hand-operated oil pump, a hydraulic hand-operated reversal valve and a linkage device which can make automatic state and hand-operated state synchronously switched, and the hand-operation condition is improved. The carry-over moment of the utility model above the moment can reach to more than 20000N under the condition of the operation with natural human power.

Description

Pneumatic actuator

The utility model relates to a kind of pneumatic actuator that is used for damper baffle plate, valve.

Existing pneumatic actuator partly is made of with the manual part of machinery automatically air pressure.Pneumatic part is power and under the adjusting of regulon or artificial given electrical signal or gas signal with pressurized air, makes cylinder operation, by the displacement of output shaft output corner.Manually part adopts screw thread to pay or the worm gear pairs mechanical drive mode.Under the automatic runnability of air pressure, the half nuts on the slide block of manual operating device is what to separate with leading screw, and slide block can move freely on leading screw.When needing hand behaviour, earlier changer lever is pulled behaviour in one's hands position, half nuts is moved upward and mesh with leading screw, the upper and lower chamber of cylinder is communicated with simultaneously, can directly operate like this with handwheel, when handwheel rotated, slide block moved axially along leading screw, and swing arm rotates under slide block drives and changes the corner displacement of output shaft.There is obvious deficiency in this mechanical manual operating device: (1) parts engagement place is easy to wear, volume is big, difficulty of processing is high.(2) carry-over moment is little, and pneumatic actuator hand behaviour effort, general nature power operation maximum delivered 400N.m moment that middle moment is above then need be used auxiliary handwheel greater than 4000N.m.

The purpose of this utility model is exactly the problem at above-mentioned pneumatic actuator, change manual mode, design a kind of pneumatic actuator that is different from the band hydraulic manual device of prior art, make it simple in structure, easy to manufacture, flexible operation is laborsaving, can transmit big moment for the above actuator of middle moment under natural manual operation.

The utility model is realized by such technological scheme: basic structure comprises a support, is cut down, is switched and cut down automatic part of the air pressure of forming and manual part by cylinder, positioning work piece, locking.Described manual part adopts a kind of the commutation by oil cylinder, hand oil pump, hydraulic manual to cut down the hydraulic manual device of forming.Automatically the switching of part is cut down and is adopted three switching constructions to cut down switching synchronously with the three-position four-way hydraulic manual reverse of direction of manual part, or by a continuous action device with switching cut down, commutating to cut down links together, switch by the order of manauto-manual.When moving automatically, manually the upper and lower chamber of the oil cylinder of part is connected, and oil cylinder piston is quick condition; When needing manually-operable, to switch the continuous action device handle wrench to manual position, at this moment the upper and lower chamber of cylinder is connected, oil pump under manual operation constantly to oil cylinder cavity of resorption or epicoele fuel feeding, under the oil pressure effect, promote piston and rise or descend, drive the crank that is fixed on the output shaft, thereby make the displacement of output shaft output corner.The connection of oil circuit, commutation, the connection of gas circuit is switched and to be switched continuous action device synchronously by one and control, and guarantees pneumaticly to switch synchronously with hydraulic manual, works alone, and constitutes a kind of pneumatic actuator integral body with hydraulic pressure installation.

The output shaft of described pneumatic actuator is bearing in horizontal position, cylinder and oil cylinder separately the drawing head on the piston rod respectively be fixed on output shaft on two cranks in corresponding one be hinged.The position of cylinder, oil cylinder is on the support of the one or both sides of output shaft axis.

Switch and cutting down six the switching holes that evenly distribute on the pedestal, switch each time and then connect wherein two holes, as with the position of representing six holes on the flat square system of coordinates, the hole seat external body nose end that is in 30 degree, 150 degree, 270 degree has screw thread, the hole of 90 degree, 210 degree, 330 degree is half logical blind hole, 90 degree holes communicate with the air source hole of pedestal side, and 270 degree holes connect regulates that parts 30 degree holes and 330 degree holes, 150 degree holes and 210 spend that holes connect respectively and by 30 spending, 150 spending holes and connect the upper and lower chamber of cylinder.

The utility model makes the manual part operation of pneumatic actuator flexible owing to adopted hydraulic pressure hand behaviour system, and structure is simpler than existing machinery manual operating device, and carry-over moment can be up to 20000N.m.

Fig. 1, a kind of concrete structure drawing of device that provides according to the utility model.

Fig. 2 switches and cuts down sectional view.

Fig. 3 switches and cuts down the A-A sectional view.

Be described in detail below in conjunction with accompanying drawing 1 to 3:

Pneumatic actuator of the present utility model support (16) as shown in Figure 1 is a supporting mass, and output shaft (11) is arranged on support top.Crank (12), crank (13) are fastened on the output shaft (11), and by tow attachment (14), (15) respectively with its bottom hinge be connected on oil cylinder (1) on support (16) pedestal, cylinder (4) separately piston rod be connected.Crank (12) and crank (13) are installed on the output shaft, are 180 degree along the diameter of axle to stretching out the relative position angle.When oil cylinder piston was in upper dead center, cylinder piston then was in lower dead point position, and moving direction is opposite.Oil cylinder (1) divides both sides to install with cylinder (4).Automatically the switching of part cut down (7) by connecting rod (8), to connect continuous action device that handle (9), pivoted arm (10) form be intermediary with hydraulic manual commutates and cut down (2) and be connected.Switching is cut down (7) and is cut down three switchings of (2) employing with manual reverse of direction.Be in position (1), the upper and lower chamber of cylinder communicates, and the oil cylinder cavity of resorption connects the pressure hydraulic fluid port, and epicoele takes back the road; Be in position (2), the cylinder activation source of the gas is connected in the upper and lower chamber of oil cylinder; Position (3), the upper and lower chamber of cylinder communicates, and the oil cylinder epicoele connects the pressure hydraulic fluid port, and cavity of resorption takes back the road.

Switch cut down (7) pedestal (71) shape as shown in Figure 3, in six equally distributed holes, hole A, hole C, hole E are through hole, there is screw thread in the hole by the bottom nose end, they are connected by pipe with upper chamber of air cylinder, positioning work piece (5), lower chamber of air cylinder respectively; Hole B, hole D, hole F are that blind hole communicates with the hole G of hole A, hole E and pedestal (71) side respectively.The G center that communicates with source of the gas in hole is axle, press Fig. 2 successively go up at pedestal (71) assemble diaphragm (72), pedestal assembly body (73), steel ball (74), accessory (75) and spring, packing ring, then with nut check.Accessory (75) is 120 degree with the axle slewing area, and the steel ball on the accessory also moves thereupon, and three switching position angles are respectively 30 degree, 90 degree, 150 degree.Each switching position all has the hole and the steel ball of two relative 180 degree to be interlocked, because the diaphragm between hole and the steel ball is not compacted, so this two hole communicates, remaining hole is plugged.

The utility model compared with prior art has the following advantages:

For the pneumatic actuator more than the middle moment, the hydraulic manual structural volume is smaller, simple in structure, processing and manufacturing easy, part standard degree height, and manually-operated is laborsaving, and output torque is big.

The preferred plan that the utility model is implemented is: the diameter of hydraulic cylinder (1) is got 50～100mm, and the discharge capacity of hand oil pump (3) is at 2.3 milliliters/time.

Claims

1, a kind of pneumatic actuator, form by automatic part and manual part, cylinder (4) is hinged on the support (16), by positioning work piece (5), (6) are cut down in locking, switching is cut down (7) and is worked under the pressurized air effect, tow attachment on the cylinder piston rod is that crank (13) on the output shaft (11) of supporting is hinged with being fixed on support (16), cylinder (4) piston is with on the cylinder, cavity of resorption pressure change and rise or descend, output shaft drives the output corner displacement by crank, it is characterized in that manually part adopts the hydraulic manual device, by oil cylinder (1), (2) are cut down in the hydraulic manual commutation, hand oil pump (3), form and connect three switchings of automatic part by a synchronous switching continuous action device and cut down (7), (2) are cut down in the hydraulic manual commutation of hydraulic manual part.

2, pneumatic actuator according to claim 1 is characterized by that oil cylinder (1) and cylinder (4) are installed in output shaft axis both sides respectively or with on the side support.

3, pneumatic actuator according to claim 1 is characterized in that switching continuous action device and is made up of connecting rod (8), handle (9), pivoted arm (10).

4, pneumatic actuator according to claim 1, it is characterized in that being fixed on (13) two shaft arms of crank (12), crank on the output shaft, to stretch out direction opposite, along radially relative 180 degree of axle (11).

5, pneumatic actuator according to claim 1 is characterized in that switching on the pedestal (71) that cuts down (7) six equally distributed switching holes is arranged.

6, as pneumatic actuator as described in claim 1 or 5, it is characterized in that switching last six any three holes of switching relative angle 60 degree in the hole of the pedestal (71) that cuts down (7) is the through hole that threaded coupling is arranged, all the other holes are blind hole, the hole with pedestal (71) sidewall connects in the blind hole, and other two blind holes communicate with the adjacent hole of their non-common adjacencies respectively with in three through holes.