CN210423919U - Double-piston shifting fork type pneumatic actuator with bidirectional adjusting function - Google Patents
Double-piston shifting fork type pneumatic actuator with bidirectional adjusting function Download PDFInfo
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- CN210423919U CN210423919U CN201920883805.3U CN201920883805U CN210423919U CN 210423919 U CN210423919 U CN 210423919U CN 201920883805 U CN201920883805 U CN 201920883805U CN 210423919 U CN210423919 U CN 210423919U
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- piston
- shifting fork
- end cover
- pneumatic actuator
- shell
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- 230000002457 bidirectional effect Effects 0.000 title claims description 12
- 238000007789 sealing Methods 0.000 claims description 25
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000009711 regulatory function Effects 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model discloses a double-piston shifting fork type pneumatic actuator with two-way regulatory function belongs to the executor field. Comprises a shell and end covers arranged at two ends of the shell; the end covers comprise a left end cover and a right end cover; a shifting fork is arranged in the center of the shell; u-shaped grooves are formed in the two ends of the shifting fork; pistons are symmetrically arranged on two sides in the shell; one end of the piston is provided with a piston pin; the piston pin is provided with a ball; the ball is clamped in the U-shaped groove in a matched manner; a flat end fastening bolt is arranged on the left end cover, and an adjusting bolt is arranged on the right end cover; a through hole is formed in the piston corresponding to the adjusting bolt; the piston is sleeved on an adjusting bolt through a through hole, and the adjusting bolt is used for limiting the stroke of the piston. The utility model discloses can play the effect of the two-way regulation of shifting fork formula pneumatic actuator.
Description
Technical Field
The utility model belongs to the executor field, concretely relates to double-piston shifting fork type pneumatic actuator with two-way regulatory function.
Background
The pneumatic actuator is an actuating device for opening and closing or regulating a valve by air pressure, is also called a pneumatic actuating mechanism or a pneumatic device, but is generally called a pneumatic head. The pneumatic actuator is sometimes provided with a certain auxiliary device, the existing market has two types of rack type pneumatic actuators and shifting fork type pneumatic actuators, the shifting fork type pneumatic actuator is a piston driven by compressed air, and the piston converts linear motion into a special device for rotary motion of an output shaft through a shifting fork, so that the control of the valve is realized. Therefore, the limit adjustment of the stroke of the piston can play a role in adjusting the rotating angle of the output shaft.
The original design of the shifting fork pneumatic actuator is that a flat-end fastening bolt is respectively arranged on the centers of end covers at two ends, and the length of the flat-end fastening bolt extending into the actuator shell is not more than the distance between the end cover and the bottom of a piston when the piston runs to the middle. The ball is fixed on the piston through the piston pin and is clamped in the U-shaped groove of the shifting fork. When the piston moves to the middle, when the piston R angle touches the lining, the piston stops moving, because the piston R angle and the lining size are fixed, the piston does not have the stroke adjusting function at the position, when the piston moves to two ends, the flat-end fastening bolt props against the bottom of the piston, the effect of limiting the motion stroke of the piston is achieved, because the flat-end fastening bolt can be screwed inwards or outwards, the stroke of the piston when the piston is close to the end cover can be adjusted, but the effect of the left flat-end fastening bolt and the right flat-end fastening bolt is the same, and the stroke of the piston when the piston is close to the end cover can only be adjusted in a one-way mode.
Disclosure of Invention
Problem to prior art scheme existence, the utility model aims to provide a two-piston shifting fork formula pneumatic actuator with two-way regulatory function to the piston that exists among the solution prior art only has the problem of one-way regulation stroke.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a double-piston shifting fork type pneumatic actuator with a bidirectional adjusting function comprises a shell and end covers arranged at two ends of the shell; the end covers comprise a left end cover and a right end cover; a shifting fork is arranged in the center of the shell; u-shaped grooves are formed in the two ends of the shifting fork; pistons are symmetrically arranged on two sides in the shell; one end of the piston is provided with a piston pin; the piston pin is provided with a ball; the ball is clamped in the U-shaped groove in a matched manner; the left end cover is provided with a flat end fastening bolt which is used for limiting the stroke of the piston moving to the two ends; an adjusting bolt is arranged on the right end cover; a through hole is formed in the piston corresponding to the adjusting bolt; the piston is sleeved on an adjusting bolt through a through hole, and the adjusting bolt is used for limiting the stroke of the piston moving towards the middle.
Furthermore, a sealing groove is formed in the inner side wall of the through hole; and a sealing ring is arranged in the sealing groove.
Furthermore, the flat-end fastening bolt and the adjusting bolt are connected with a sealing nut through threads; and a sealing ring is arranged between the sealing nut and the outer side end cover.
Furthermore, an end cover sealing ring is arranged at the joint of the shell and the end cover.
Furthermore, the upper end and the lower end of the shifting fork are both connected with bushings.
Furthermore, one end of the adjusting bolt penetrating through the through hole is provided with a top step.
Compared with the prior art, the beneficial effects of the utility model are that:
the adjusting bolt is arranged between the right piston and the end cover, when the piston moves to the middle, the top step of the adjusting bolt holds the piston to limit the moving stroke of the piston towards the middle, and the adjusting bolt can be adjusted outwards or inwards, so that the stroke adjusting effect is realized when the piston is close to the shifting fork; in addition, because the left end is simultaneously provided with a flat end fastening bolt, when the piston moves towards the end covers at the two sides, the flat end fastening bolt can prop against the piston, and the stroke of the piston moving towards the two ends is limited; therefore, when the piston moves towards the middle or two ends, the piston can be limited by the flat-end fastening bolt and the adjusting bolt, namely the rotating angles of the open position and the closed position of the output shaft of the actuator can be adjusted simultaneously, and the bidirectional adjustment effect can be achieved.
Drawings
FIG. 1 is a schematic structural view of the present invention when the piston moves to the middle;
fig. 2 is a schematic structural diagram of the present invention when the piston moves to both ends.
Reference numerals: 1-a shell; 2-end cap; 3-a piston; 4-shifting fork; 5-a bushing; 6-piston pin; 7-a ball bearing; 8-end cap seal ring; 9-sealing ring; 10-a sealing nut; 11-flat end fastening bolt; 12-adjusting the bolt; 13-a seal groove; 14-U type groove.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and fig. 2, a double-piston shifting fork type pneumatic actuator with a bidirectional adjusting function comprises a housing 1 and end covers 2 arranged at two ends of the housing 1; the end cover 2 comprises a left end cover and a right end cover; a shifting fork 4 is arranged at the center in the shell 1; two ends of the shifting fork 4 are provided with U-shaped grooves 14; pistons 3 are symmetrically arranged on two sides in the shell 1; one end of the piston 3 is provided with a piston pin 6; the piston pin 6 is provided with a ball 7; the ball 7 is clamped in the U-shaped groove 14 in a matching mode; a flat end fastening bolt 11 is arranged on the left end cover, and an adjusting bolt 12 is arranged on the right end cover; a through hole is arranged on the piston 3 corresponding to the adjusting bolt 12; the piston 3 is sleeved on an adjusting bolt 12 through a through hole, and the adjusting bolt 12 is used for limiting the stroke of the piston 3.
The lower end of the shifting fork 4 is connected with a bush 4.
The flat end fastening bolt 11 and the adjusting bolt 12 are connected with a sealing nut 10 through threads; a sealing ring 9 is arranged between the sealing nut 10 and the outer end cover 2.
An end cover sealing ring 8 is arranged at the joint of the shell 1 and the end cover 2.
A sealing groove 13 is arranged on the inner side wall of the through hole; be provided with sealing washer 9 in the seal groove, the centre of piston 3 sets up the through-hole for adjusting bolt 12 can run through, and set up seal groove 13 on piston 3, be used for placing sealing washer 9, prevent gas leakage.
Selecting a sealing ring 9, wherein in order to ensure the concentricity of the piston 3 and the outer end cover 2 of the corresponding end, an O-shaped sealing ring 9 with a compensation function is to be selected;
an adjusting bolt 12 penetrates through a through hole at the bottom of the piston 3 and is fixed on a central thread of the end cover 2, and a ball 7 is fixed on the piston 3 through a piston pin 6 and is clamped in a U-shaped groove 14 of the shifting fork 4. The length of the flat-end fastening bolt 11 extending into the actuator shell is not more than the distance between the end cover 2 and the bottom of the piston 3 when the piston 3 runs to the middle; the length of the adjusting bolt 12 is greater than 1/2, which is the wall thickness of the bottom of the piston 3 is smaller than the length of the housing 1, that is, the turning radius of the shift fork 4, that is, the adjusting bolt 12 cannot interfere with the movement track of the shift fork 4 at the longest.
When the piston 3 moves to the middle, the top step of the right adjusting bolt 12 pulls the piston 3 to limit the moving stroke of the piston 3 to the middle, and the adjusting bolt 12 can be adjusted outwards or inwards, so that the stroke adjusting function is realized on the piston 3; and because of the matching of the ball 7 and the shifting fork 4, when the piston 3 on one side is limited, the piston 3 on the other side can not move.
When the piston 3 moves to two ends, the flat end fastening bolt 11 is pressed against the bottom of the piston 3, which plays the role of limiting the movement stroke of the piston 3, because the flat end fastening bolt 11 can be screwed inwards or outwards, the stroke of the piston when approaching the end cover 2 can be adjusted,
when the piston 3 runs to the middle or both ends, the stroke of the piston 3 can be adjusted, that is, the rotating angles of the open position and the closed position of the output shaft of the actuator can be adjusted simultaneously, and the bidirectional adjustment effect can be achieved. Can be adjusted by 93-85 degrees.
When the piston 3 is in the middle position, the valve of the actuator is in a fully closed state, and generally because of the problem of valve precision, even in the fully closed state, the situation that the valve is dead or over-dead exists, and a pneumatic actuator which can simultaneously adjust the degree of closure and the opening degree is needed.
The default state is that the valve closes and dies later 3, dies promptly, as long as close dead angle in the default and subtract 3 degrees and just can close, this time the utility model discloses an adjusting bolt 12 plays, lets the valve just close.
The above-mentioned specific embodiments, right the utility model provides a technical problem, technical scheme and beneficial effect carry out further detailed description, should the utility model discloses the technical means that the scheme was disclosed is not only limited to the technical means that the above-mentioned embodiment was disclosed, still includes the technical scheme who constitutes by the arbitrary combination of above-mentioned technical characteristic. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (6)
1. A double-piston shifting fork type pneumatic actuator with a bidirectional adjusting function is characterized by comprising a shell and end covers arranged at two ends of the shell; the end covers comprise a left end cover and a right end cover; a shifting fork is arranged in the center of the shell; u-shaped grooves are formed in the two ends of the shifting fork; pistons are symmetrically arranged on two sides in the shell; one end of the piston is provided with a piston pin; the piston pin is provided with a ball; the ball is clamped in the U-shaped groove in a matched manner; the left end cover is provided with a flat end fastening bolt which is used for limiting the stroke of the piston moving to the two ends; an adjusting bolt is arranged on the right end cover; a through hole is formed in the piston corresponding to the adjusting bolt; the piston is sleeved on an adjusting bolt through a through hole, and the adjusting bolt is used for limiting the stroke of the piston moving towards the middle.
2. The double-piston shifting fork type pneumatic actuator with the bidirectional adjusting function as recited in claim 1, wherein a sealing groove is formed on an inner side wall of the through hole; and a sealing ring is arranged in the sealing groove.
3. The double-piston shifting fork type pneumatic actuator with the bidirectional adjusting function is characterized in that the flat-end fastening bolt and the adjusting bolt are connected with a sealing nut through threads; and a sealing ring is arranged between the sealing nut and the outer side end cover.
4. The double-piston shifting fork type pneumatic actuator with the bidirectional adjusting function is characterized in that an end cover sealing ring is arranged at the joint of the shell and the end cover.
5. The double-piston shifting fork type pneumatic actuator with the bidirectional adjusting function is characterized in that bushings are connected to the upper end and the lower end of the shifting fork.
6. The double-piston shifting fork type pneumatic actuator with the bidirectional adjusting function is characterized in that one end, penetrating through the through hole, of the adjusting bolt is provided with a top step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920883805.3U CN210423919U (en) | 2019-06-13 | 2019-06-13 | Double-piston shifting fork type pneumatic actuator with bidirectional adjusting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920883805.3U CN210423919U (en) | 2019-06-13 | 2019-06-13 | Double-piston shifting fork type pneumatic actuator with bidirectional adjusting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210423919U true CN210423919U (en) | 2020-04-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920883805.3U Expired - Fee Related CN210423919U (en) | 2019-06-13 | 2019-06-13 | Double-piston shifting fork type pneumatic actuator with bidirectional adjusting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210423919U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007426A (en) * | 2021-03-18 | 2021-06-22 | 北京瑞拓江南自控设备有限公司 | Angle stroke double shifting fork type hydraulic actuating mechanism |
-
2019
- 2019-06-13 CN CN201920883805.3U patent/CN210423919U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113007426A (en) * | 2021-03-18 | 2021-06-22 | 北京瑞拓江南自控设备有限公司 | Angle stroke double shifting fork type hydraulic actuating mechanism |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200428 |