CN2241804Y

CN2241804Y - Opening and closing drive device for pneumatic reciprocating valve

Info

Publication number: CN2241804Y
Application number: CN 95226110
Authority: CN
Inventors: 张雄飞
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-17
Filing date: 1995-11-17
Publication date: 1996-12-04
Anticipated expiration: 2005-11-17

Abstract

The utility model relates to an opening and closing drive device for a pneumatic reciprocating valve, which is composed of a cylinder body, a cylinder cover, two pistons, a linkage mechanism and a drive shaft, wherein the linkage mechanism between the two pistons is a linkage shifting fork sheet with an oblong cross section, and a square hole is arranged in the middle of the linkage shifting fork sheet, and square guiding grooves are arranged on both ends; the drive shaft is a square drive shaft matched with the square hole arranged in the middle of the linkage shifting fork sheet, the linkage shifting fork piece can be clamped on the square drive shaft, and the square drive shaft rotates by using the square drive shaft as a shaft; the drive shaft is connected with a valve rod, so the opening and the closing of the valve are driven. Two pins used as guiding rods are respectively arranged on the two pistons in the cylinder body, the pins can be inserted into the square guiding grooves arranged on both of the two ends of the linkage shifting fork sheet, and the linkage of the two pistons is realized.

Description

Pneumatic reciprocating type valve opening and closing drive unit

The utility model relates to a kind of pneumatic reciprocating type valve opening and closing drive unit, be specifically a kind of by gas pressure make reciprocating motion of the pistons drive the valve rod of valve suitable/contrary rotation, thereby drive the piston reciprocating type valve actuator of valve opening and closing, belong to the transmission device technical field.

In background technique, piston reciprocating type valve opening and closing drive unit is seen Fig. 1, and it is mainly by two that install in cylinder body 2 and the cylinder body mutually corresponding tooth bars 4 that have

Shape piston 1 and gear drive axle 8 formed, and gear 3 is installed on gear drive axle 8, gear 3 and two Tooth bar 4 mutual interlocks on the shape piston 1, on cylinder body 2, have and lead to advancing/air outlet hole of cylinder between two-piston, the matching gap of two-piston and inboard wall of cylinder block is zero, when in cylinder, exerting pressure by inlet hole, two pistons outwards stretch, tooth bar on the piston will driven gear 3, live axle 8 is rotated counterclockwise, and makes valve opening/switching, at this moment has pressurized air to produce between two-piston 1 and the cylinder cap 6; When the pressure in the cylinder reduced, pressurized air promoted piston again and compresses in cylinder, simultaneously, gear 3 live axles 8 that tooth bar 4 on the piston drives interlock mutual with it turn clockwise, make valve closing/unlatching, make a round trip like this, finish the process that valve was once opened and closed to valve.The defective of this device is that tooth bar 4 on the piston of mutual interlock and gear drive between the gear 3 on the axle 8, be prone to stuck phenomenon, and because of limitting in the space in the cylinder body, it is too big that gear can not be done, thereby required driving torque is big; In addition, for preventing the gas blowby between piston and inboard wall of cylinder block, the matching gap of piston and inboard wall of cylinder block will equal zero as far as possible, just exists the problem of dry friction so between the two, directly influences the working life of this device.

The purpose of this utility model is a kind of friction, rotation valve opening and closing drive unit flexible, easy to use that can reduce between piston and the cylinder body of design.

For achieving the above object, it is square interlock fork sheet that the utility model adopts a kind of cross section, has square guiding groove at its two ends, and the centre has square hole; Live axle is a square drive axle that matches with institute's opening square hole in the middle of the interlock fork sheet, and it can be installed in interlock fork sheet; On left and right two upper pistons, respectively be provided with a pin, in the square guiding groove that it can be opened interlock fork sheet two ends is plugged on, when two-piston compression or stretching, extension, pin on the piston just slides in the square guiding groove that interlock fork sheet two ends are opened, interlock fork sheet is in a good mood/contrary rotation in the square drive axle being, drives the square drive axle and rotate, simultaneously, the valve rod that driving links to each other with the square drive axle just drives valve opening/close; Piston and inboard wall of cylinder block are Spielpassung in addition, and " O " RunddichtringO is installed on piston, to reduce the friction of piston and cylinder body, seal simultaneously.

The utlity model has following advantage: 1, because piston and inboard wall of cylinder block are Spielpassung, by on the piston overlap " O " type rubber seal and form sealing, avoided direct friction between piston and the inboard wall of cylinder block, piston and inboard wall of cylinder block are not fragile, thereby long service life, easily damaged parts is " O " RunddichtringO just, changes easily.2, utilize interlock fork sheet to drive live axle, moment is big, rotates flexibly, and valve opening is convenient.

Description of drawings is as follows:

Fig. 1: be reciprocating piston type valve opening and closing apparatus structure schematic representation in the prior art;

Fig. 2: be the utility model embodiment 1 structural representation;

Fig. 3: be the utility model embodiment 2 structural representations;

Fig. 4: be piston structure schematic representation among the utility model embodiment 1.

Found out that by Fig. 2 it is made up of interlock fork sheet 15 and square drive axle 12 between cylinder body 9, cylinder cap 11, double-piston 14 and two-piston, piston 14 is

Type, it with cylinder body 9 for the gap greater than zero cooperate, be set with " O " type rubber seal 10 on it, promptly seal, can prevent the dry friction between piston 14 and the inboard wall of cylinder block again; Connect for interlock fork sheet 15 between the two-piston 14, the cross section of interlock fork sheet 15 is a rectangular, the centre has square hole, two ends have the rectangular guiding groove, square hole in the middle of it matches with the square of square drive axle 12, interlock fork sheet 15 can be connected on the square drive axle 12, respectively be provided with one in two ends of two-piston relative angle and make guide rod pin 13, in this pin can be plugged on the rectangular guiding groove that open at interlock fork sheet 15 two ends that are stuck on the square drive axle 12; On cylinder cap 11, be provided with air inlet/outlet, when piston 14 being exerted pressure by inlet hole, piston is compression just, pin 13 on the piston just in the square guiding groove that open at interlock fork sheet 15 two ends to central slide, making interlock fork sheet 15 is that the center is rotated counterclockwise with square drive axle 12, driving live axle 12 rotates, simultaneously, drive the valve rod link to each other with the square drive axle, just can drive the unlatching of valve or close, if reduce external pressure, compressed air expansion in 14 cylinders of cylinder body 9 inner carriers stretches two-piston, and the pin 13 on the piston 14 slides to two ends in the set square guiding groove in interlock fork sheet 15 two ends, interlock fork sheet 15 is clockwise rotated, drive live axle 12 and rotate, simultaneously, drive the valve rod that links to each other with the square drive axle, drive valve closing or unlatching, thereby realize the purpose of this utility model.

Fig. 3 is another example structure schematic representation of the utility model, among the figure, cylinder body 9, cylinder cap 11, " O " type rubber seal, interlock fork sheet 15 between two-piston and square drive axle 12 all with embodiment 1 in identical, different is, and two-piston is made into the longitudinal cross-section is " Contraband " font (see figure 4), in piston, be provided with and have four pawls at interval mutually, two earrings 17 that pawl is a pin 13 wherein, two pawls are the support guide pawl in addition, when two pistons are compressed, four pawls of one of them piston can be plugged in the interval each other of four pawls of another piston, piston can be slided in cylinder body flexibly, on four pawls of piston, " O " type rubber ring also can be installed, prevent the friction between piston and the inboard wall of cylinder block.

Claims

1, a kind of pneumatic reciprocating type valve opening and closing drive unit is made up of linking mechanism between cylinder body, cylinder cap, double-piston and two-piston and live axle, it is characterized in that:

(1) linking mechanism between two-piston is that a cross section is a rectangular interlock fork sheet (15), has square hole in the middle of it, and two ends have square guiding groove;

(2) live axle is a square drive axle (12) that matches with the middle institute opening square hole of interlock fork sheet (15), and it can be connected to interlock fork sheet, and rotates as axle, and live axle links to each other with valve rod, drives the keying of valve;

(3) respectively establish one on two pistons in cylinder body (9) and make guide rod with pin (13), it can be plugged in the square guiding groove of interlock fork sheet (15) two ends that are connected on the square drive axle (12) opening, and realizes the interlock of two-piston.

2, pneumatic reciprocating type valve opening and closing drive unit according to claim 1, it is characterized in that between piston (14) and cylinder body (9) inwall for the gap greater than zero cooperate, on piston (14), be set with " O " type rubber seal.

3, pneumatic reciprocating type valve opening and closing drive unit according to claim 1 and 2 is characterized in that piston (14) is Type or " Contraband " type which is provided with a pair of earrings (17) that pin (13) are installed.