Pneumatic control device and related equipment

Abstract

The invention discloses a pneumatic control device and related equipment. The pneumatic control device comprises a positioner, an air cylinder and a connecting part; the positioner is connected with the cylinder through the connecting part; the connecting part comprises a feedback device, a feedback linear plate and a first connecting plate; the mounting stand column is used for fixing the positioner on the feedback device; the feedback device comprises a first feedback shaft, and the positioner connecting shaft is connected with the first feedback shaft and a second feedback shaft of the positioner so as to transmit a rotation angle fed back by the feedback device to the second feedback shaft; the first connecting plate is used for connecting a piston rod of the air cylinder and the feedback linear plate so that the piston rod can drive the feedback linear plate to move in the horizontal direction in the horizontal movement state, and displacement of the piston rod in the horizontal direction is converted into the rotation angle of a first feedback shaft in the feedback device through the feedback linear plate. Linkage and accurate position feedback between the air cylinder and the positioner can be achieved, the overall structure is compact, and the device is suitable for various installation spaces.

Description

Technical Field

[0001] The present invention relates to the field of control technology, and in particular to a pneumatic control device and related equipment. Background Art

[0002] Valve positioners are usually used in the electric power, chemical industry, mineral processing and other industries. The positioner acts on the cylinder, and the displacement of the cylinder controls the opening and closing of the valve.

[0003] For example, a typical electro-pneumatic valve positioner in a valve positioner converts the output signal of an electric controller into a gas signal to drive a pneumatic actuator. It has two functions: an electro-pneumatic converter and a pneumatic valve positioner. An electro-pneumatic valve positioner has the function of an electro-pneumatic converter on the one hand, and a pneumatic valve positioner on the other hand, which can accurately locate the valve position according to the signal sent by the controller (i.e., the input signal and the valve position are in a one-to-one correspondence).

[0004] In the existing technology, the mechanical connection structure between the valve positioner and the cylinder usually uses a connecting rod mechanism. If the cylinder stroke is long and the connecting rod size is long, it will affect the positioner accuracy. In addition, the overall shape of this structure is large, which ultimately limits the installation space. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a pneumatic control device and related equipment that overcome the above problems or at least partially solve the above problems.

[0006] In a first aspect, an embodiment of the present invention provides a pneumatic control device, comprising: a positioner and a cylinder; and further comprising: a connecting portion;

[0007] The positioner is connected to the cylinder via a connecting portion;

[0008] The connecting part includes: a feedback device, a feedback linear plate and a first connecting plate;

[0009] The mounting column is used to fix the positioner on the feedback device;

[0010] The feedback device comprises a first feedback shaft, and the positioner connecting shaft connects the first feedback shaft of the feedback device and the second feedback shaft of the positioner, so as to transmit the rotation angle fed back by the feedback device to the second feedback shaft of the positioner;

[0011] The first connecting plate is used to connect the piston rod of the cylinder and the feedback linear plate, so that the piston rod drives the feedback linear plate to move in the horizontal direction when in a horizontal motion state, and converts its own horizontal displacement into the rotation angle of the first feedback shaft in the feedback device through the feedback linear plate.

[0012] In one embodiment, the feedback device further includes:

[0013] A first bearing, a second connecting plate, a feedback spring and a feedback unit;

[0014] The first bearing is sleeved on the first feedback shaft, and the lower end of the first bearing is rotatably connected to the second connecting plate;

[0015] The upper end of the feedback unit is connected to the second connecting plate, and the lower end is in contact with one side of the feedback linear plate, so that when the feedback linear plate moves back and forth on a horizontal plane, the feedback unit is driven to move, and then the first bearing is driven to rotate through the second connecting plate.

[0016] In one embodiment, the second connecting plate is triangular, and the upper end of the feedback unit, one end of the feedback spring, and the first bearing and the first feedback shaft sleeved by the first bearing are respectively arranged at corresponding positions of the three corners of the second connecting plate;

[0017] The center positions of the first bearing and the first feedback shaft do not move on the horizontal plane. When the feedback linear plate moves back and forth in the horizontal direction, the side of the triangle connected by the feedback unit and the feedback spring moves with the center of the first bearing as the center.

[0018] In one embodiment, the feedback device further comprises: a support for a spring;

[0019] One end of the feedback spring is hung on the second connecting plate, and the other end is hung on the spring support.

[0020] In one embodiment, the feedback unit has a second bearing; the feedback linear plate is an L-shaped plate, and the feedback linear plate includes a horizontal plate and a vertical plate connected vertically;

[0021] The edge of the side of the horizontal plate not connected to the vertical plate is at least partially configured as a feedback curve;

[0022] The outer wall of the second bearing of the feedback unit abuts against the edge of the side.

[0023] In one embodiment, the feedback curve is generated by:

[0024] During the movement of the cylinder piston rod, the feedback linear plate moves accordingly, and the second bearing of the feedback unit also moves accordingly. The angle α between the line connecting the axis of the second bearing and the axis of the positioner feedback shaft and the horizontal axis also changes accordingly. The coordinates of the tangent point between the second bearing of the feedback unit and the feedback linear plate (X 切 ,Y 切), determine the number of points on the feedback curve by the cylinder stroke, and calculate the coordinate value of each point (X 切 ,Y 切 ), thereby generating the feedback curve;

[0025] The horizontal axis is the extending direction of the side where the horizontal plate is connected to the vertical plate.

[0026] In one embodiment, the coordinates of the tangent point satisfy the following formula:

[0027] X 切n =X 心n +R×sinθ n ;

[0028] Y 切n =Y 心n -R×cosθ n ;

[0029] Where: θ n =arctan(Y 心n -Y 心n-1 ) / (X 心n -X 心n-1 );

[0030] X 心n =X 0n -L×cosα n ;

[0031] Y 心n =Y0-L×sinα n ;

[0032] Wherein, R is the radius of the second bearing of the feedback unit, which is a constant; L is the distance between the positioner feedback axis and the feedback unit second bearing axis, which is a constant; α is the angle between the line between the positioner feedback axis and the feedback unit axis and the horizontal axis; θ is the rotation angle of the positioner feedback axis; the vertex of the right angle side where the feedback linear plate is connected to the first connecting plate and the horizontal plate is connected to the vertical plate is the origin of the horizontal plane coordinate system; (X 切n ,Y 切n ) are the coordinates of each tangent point between the second bearing of the feedback unit and the feedback linear plate on the horizontal plane in the coordinate system; (X 心n ,Y 心n ) is the coordinate of the center point of the second bearing of the feedback unit in the coordinate system; X 0n ,Y0 is the point coordinate of the feedback axis of the positioner when the feedback linear plate moves. The value of Y0 is fixed. 0n It changes at different positions as the linear plate moves.

[0033] In one embodiment, the number of the tangency points is determined according to the cylinder stroke.

[0034] In one embodiment, the pneumatic control device further comprises:

[0035] A first guide rail, a second guide rail, a protection plate and a mounting plate; the feedback linear plate is arranged between the first guide rail and the second guide rail and is limited in the vertical direction by the first guide rail and the second guide rail, so that the feedback linear plate can move in the horizontal direction;

[0036] The protection plate is arranged above the first guide rail and is fixedly connected to the first guide rail; the mounting plate is arranged below the second guide rail and is fixedly connected to the second guide rail.

[0037] In a second aspect, an embodiment of the present invention provides a device, the device comprising a valve and also comprising a pneumatic control device as described above;

[0038] The pneumatic control device is used to control the opening and closing of the valve.

[0039] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0040] The pneumatic control device and related equipment provided by the embodiment of the present invention, through a feedback device, a feedback linear plate and a first connecting plate, etc., the feedback device has a first feedback shaft, and the first feedback shaft is connected to the second feedback shaft of the positioner. When the cylinder piston rod drives the feedback linear plate to move through the first connecting plate, the feedback linear plate can convert its own displacement in the horizontal direction into a rotation angle of the first feedback shaft in the feedback device, and further feed back to the second feedback shaft of the positioner, thereby realizing the linkage and precise position feedback between the cylinder and the positioner, and the connecting part is between the positioner and the cylinder, so that the overall structure is compact and suitable for installation spaces of various sizes.

[0041] Furthermore, the second connecting plate is triangular. When the feedback linear plate moves forward or backward, the second connecting plate rotates, driving the first feedback shaft to rotate, pulling the feedback spring to generate tension, and the force and reaction force interact to play a braking role. The entire feedback structure has only one rotation axis (the first feedback shaft), and the triangular structure is more stable and will not produce eccentricity.

[0042] Furthermore, the cylinder piston rod extends and drives the feedback linear plate forward through the first connecting plate connected to the cylinder piston rod. The second bearing acts on the second connecting plate through the feedback unit, thereby tightening the feedback spring. At the same time, the second feedback shaft of the positioner rotates clockwise through the first feedback shaft and the positioner connecting shaft. The second feedback shaft of the positioner acts on the angle sensor. Through the adjustment of the internal processing circuit of the positioner or the balance block, the input current of the positioner is consistent with the output position of the cylinder, thereby improving the feedback accuracy.

[0043] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0044] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0046] Figure 1 It is a schematic diagram of the overall structure of the pneumatic control device in an embodiment of the present invention;

[0047] Figure 2A and Figure 2B This is a schematic diagram of the detailed structure of the connecting part in an embodiment of the present invention;

[0048] Figure 3 It is a schematic diagram of the structure of the feedback device in an embodiment of the present invention;

[0049] Figure 4 Schematic diagram of the structural relationship between the second connecting plate, the feedback unit and the first bearing, etc. in an embodiment of the present invention;

[0050] Figure 5 A schematic diagram of structural parameters related to a feedback curve in an embodiment of the present invention;

[0051] Figure 6 It is a structural schematic diagram of a feedback linear plate in an embodiment of the present invention;

[0052] Figure 7 It is a schematic diagram of the feedback linear plate and the second connecting plate in the first position and the second position according to an embodiment of the present invention;

[0053] Description of reference numerals:

[0054] Positioner-1 Cylinder-2 Positioner connecting shaft-3 Feedback device-4 Mounting column-5 Mounting plate-6 Feedback linear plate-7 First connecting plate-8;

[0055] Piston rod-21 first feedback shaft-41 first bearing-42 first guide rail-43 second guide rail-44 protection plate-45 second connecting plate 46 feedback spring-47 feedback unit-48 support for spring-49;

[0056] Second bearing - 481. DETAILED DESCRIPTION

[0057] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0058] In order to solve the problems in the prior art of the connecting rod structure of the valve positioner that may affect the positioner accuracy, the overall appearance is large, and the installation space is limited, the present invention provides a novel pneumatic control device.

[0059] An embodiment of the present invention provides a pneumatic control device, referring to Figure 1 , Figure 2A and Figure 2B As shown, in addition to the positioner 1 and the cylinder 2, the pneumatic control device also includes a connecting part; wherein:

[0060] The positioner 1 is connected to the cylinder 2 via a connecting portion;

[0061] The connection part specifically includes: a feedback device 4, a feedback linear plate 7 and a first connection plate 8;

[0062] The mounting column 5 is used to fix the positioner 1 on the feedback device 4;

[0063] The feedback device 4 includes a first feedback shaft 41, and the positioner connecting shaft 3 connects the first feedback shaft 41 of the feedback device 4 and the second feedback shaft (not shown in the figure) inside the positioner 1, so as to transmit the rotation angle fed back by the feedback device 4 to the second feedback shaft of the positioner 1;

[0064] The first connecting plate 8 is used to connect the piston rod 21 of the cylinder 2 and the feedback linear plate 7, so that the piston rod 21 drives the feedback linear plate 7 to move in the horizontal direction when in a horizontal motion state, and converts its own horizontal displacement into the rotation angle of the first feedback shaft 41 in the feedback device 4 through the feedback linear plate 7.

[0065] In the embodiment of the present invention, the movement direction of the piston rod of the cylinder and the movement direction of the feedback linear plate are referred to as the horizontal direction; and the direction in which the positioner and the cylinder are stacked up and down is referred to as the vertical direction.

[0066] Furthermore, the first connecting plate 8 is rigidly connected to the piston rod 21 of the cylinder and the feedback linear plate 7. In this way, under the action of the first connecting plate, the movement of the piston rod of the cylinder will drive the movement of the feedback linear plate.

[0067] Further, the feedback device, referring to Figure 2A and2B as well as Figure 3 As shown, it also includes:

[0068] A first bearing 42, a second connecting plate 46, a feedback spring 47 and a feedback unit 48;

[0069] The first bearing 42 is sleeved on the first feedback shaft 41, and the lower end of the first bearing 42 is rotatably connected to the second connecting plate 46;

[0070] The upper end of the feedback unit 48 is connected to the second connecting plate 46, and the lower end is abutted against one side of the feedback linear plate 7, so that when the feedback linear plate 7 moves back and forth in the horizontal direction, it drives the feedback unit 48 to move, and then drives the first bearing 42 to rotate through the second connecting plate 46.

[0071] The second connecting plate 46 is connected to three components, namely, the first feedback shaft 41 (and the first bearing 42 sleeved outside the first feedback shaft), the feedback spring 47 and the feedback unit 48 .

[0072] Reference Figure 4 As shown, the second connecting plate 46 is triangular, and the upper end of the feedback unit 48, one end of the feedback spring 47, the first bearing 42, and the first feedback shaft 41 sleeved with the first bearing 42 are respectively arranged at corresponding positions of the three corners of the second connecting plate 46;

[0073] The center positions of the first bearing 42 and the first feedback shaft 41 do not move (meaning they do not move on the plane where the second connecting plate is located, but can rotate). When the feedback linear plate 7 moves in the horizontal direction, the sides of the triangle connected by the feedback unit 48 and the feedback spring 47 move with the center of the first bearing 42 as the center.

[0074] Further, refer to Figure 4 As shown, the feedback device also includes: a spring support 49;

[0075] One end of the feedback spring 47 is hung on a position corresponding to a certain corner of the second connecting plate 46 , and the other end is hung on the spring support 49 .

[0076] When the feedback linear plate 7 moves forward, since the second connecting plate 46 is rigid and the position of the spring support 49 connected to the feedback spring 47 does not move, the feedback unit 48 will be displaced obliquely upward, and the feedback spring 47 extends forward, and the tension provided further makes the lower end of the feedback unit 48 abut against the side of the feedback linear plate 7, and continue to displace following the movement of the feedback linear plate 7, thereby driving the first feedback shaft 41 to rotate, and then transmitting the rotation angle of the first feedback shaft 41 to the second feedback shaft of the positioner 1.

[0077] Reference Figure 4As shown, the second connecting plate 46 is a triangle, one fulcrum is used to fix the first feedback shaft 41 for connecting the second feedback shaft of the positioner 1, one fulcrum is used to fix the feedback unit 48, and the other fulcrum is used to install the feedback spring 47. The other end of the feedback spring 47 is fixed by the spring support 49 to ensure the source of the pulling force. When the feedback linear plate 7 moves forward or backward, the second connecting plate 46 rotates, driving the first feedback shaft 41 to rotate, pulling the feedback spring 47 to generate pulling force, and the force and the reaction force interact to play a braking role. The entire feedback structure has only one rotation axis (the first feedback shaft), and the triangular structure is more stable and will not produce eccentricity.

[0078] The feedback unit 48 has a second bearing 481. When the input current signal of the positioner 1 increases, the pressure on the output (OUT1) side of the positioner rises, flows to the rear chamber of the cylinder through the air pipe, pushes the cylinder piston rod to extend, and drives the feedback linear plate 7 forward through the first connecting plate 8 connected to the cylinder piston rod 21. The second bearing 481 acts on the second connecting plate 46 through the feedback unit 48, thereby tightening the feedback spring 47. At the same time, the second feedback shaft of the positioner rotates clockwise through the first feedback shaft 41 and the positioner connecting shaft 3. The second feedback shaft of the positioner acts on the angle sensor. Through the adjustment of the internal processing circuit or the balance block of the positioner, the input current of the positioner 1 is consistent with the output position of the cylinder 2, thereby improving the feedback accuracy.

[0079] In order to make the feedback unit 48 more flexible when following the movement of the feedback linear plate 7, reduce the energy consumption and heat generated by friction when the first feedback shaft 41 rotates, prevent parts damage and increase reliability, the feedback unit 48 is installed with a second bearing 481, which can be, for example, a ball bearing. The first bearing 42 connected to the first feedback shaft 41 can be, for example, a flange ball bearing to improve the rotation accuracy.

[0080] Further, the above-mentioned pneumatic control device, referring to Figure 1 and Figure 3 As shown, it also includes: a first guide rail 43, a second guide rail 44, a protection plate 45 and a mounting plate 6; the feedback linear plate 7 is arranged between the first guide rail 43 and the second guide rail 44 and is limited by the first guide rail 43 and the second guide rail 44 in the vertical direction, so that the feedback linear plate 7 can only move in the horizontal direction;

[0081] The protection plate 45 is disposed above the first guide rail 43 and is fixedly connected to the first guide rail 43 ; the mounting plate 6 is disposed below the second guide rail 44 and is fixedly connected to the second guide rail 44 .

[0082] The first guide rail 43 and the second guide rail 44 limit the feedback linear plate 7 on the vertical plane, so that the feedback linear plate 7 is more stable and not easy to slide out during the lateral movement.

[0083] In addition, the first guide rail 43 and the second guide rail 44 are arranged opposite to each other in the upper and lower parts, and the first guide rail 43 and the second guide rail 44 are fixed by the protection plate 45 and the mounting plate 6. The axial position of the entire feedback device 4 only leaves a gap for the movement of the feedback linear plate, and there are no other gaps above and below. It is suitable for harsh working conditions such as dust, can adapt to poor working conditions, and has a wider applicability.

[0084] Further, the feedback linear plate 7 is an L-shaped plate, and the feedback linear plate 7 includes a horizontal plate and a vertical plate connected vertically;

[0085] The edge of the side of the horizontal plate not connected to the vertical plate is at least partially configured as a feedback curve;

[0086] The outer wall of the second bearing 481 of the feedback unit abuts against the edge of the side.

[0087] Furthermore, the above feedback curve is generated in the following way:

[0088] During the movement of the cylinder piston rod, the feedback linear plate moves accordingly, and the second bearing of the feedback unit also moves accordingly. The angle α between the line connecting the axis of the second bearing and the axis of the positioner feedback shaft and the horizontal axis also changes accordingly. The coordinates of the tangent point between the second bearing of the feedback unit and the feedback linear plate (X 切 ,Y 切 ), determine the number of points on the feedback curve by the cylinder stroke, and calculate the coordinate value of each point (X 切 ,Y 切 ), thereby generating the feedback curve.

[0089] The horizontal axis is the extending direction of the side edge where the horizontal plate is connected to the vertical plate.

[0090] Reference Figure 5 As shown, one end where the feedback linear plate is connected to the first connecting plate and the vertex of the right-angle side where the horizontal plate is connected to the vertical plate are taken as the origin of the horizontal plane coordinate system;

[0091] (X 切n ,Y 切n ) are the coordinates of the tangent points between the second bearing of the feedback unit and the feedback linear plate on the horizontal plane in the horizontal plane coordinate system;

[0092] (X 心n ,Y 心n ) is the coordinate of the center point of the second bearing of the feedback unit in the horizontal plane coordinate system;

[0093] X 0n ,Y0 is the point coordinate of the feedback axis of the positioner when the feedback linear plate moves. The value of Y0 is fixed. 0n The value of changes at different positions as the linear plate moves;

[0094] R is the radius of the second bearing of the feedback unit, which is a constant and has a fixed value;

[0095] L is the distance between the positioner feedback axis and the feedback unit second bearing axis, which is a constant with a fixed value.

[0096] α is the angle between the line between the positioner feedback axis and the feedback unit axis and the horizontal axis, which will change;

[0097] θ is the rotation angle of the positioner feedback shaft;

[0098] The feedback curve is an ideal curve in which the analog input signal corresponds to the cylinder displacement and the rotation angle of the positioner feedback shaft. When a certain point of the feedback curve contacts the feedback unit bearing, the generated signal is fed back to the positioner, and the positioner performs data processing internally to accurately control the displacement of the cylinder, so the positioning accuracy is more precise.

[0099] The coordinates of the point where the second bearing of the feedback unit is tangent to the feedback linear plate (X 切 ,Y 切 ), satisfying the following formula: X 切n =X 心n +R×sinθ n ;

[0100] Y 切n =Y 心n -R×cosθ n ;

[0101] Where: θ n =arctan(Y 心n -Y 心n-1 ) / (X 心n -X 心n-1 );

[0102] X 心n =X 0n -L×cosα n ;

[0103] Y 心n =Y0-L×sinα n .

[0104] The simple derivation process of the above formula is as follows:

[0105] X 心1 =X 01 -L*cosα1;

[0106] Y 心1 =Y0-L*sinα1;

[0107] X 心2 =X 02-L*cosα2;

[0108] Y 心2 =Y0-L*sinα2;

[0109] …

[0110] The above X 01 , X 02 They are respectively the point coordinates of the locator feedback axis at different positions of X0.

[0111] And so on, calculate each (X 心n ,Y 心n ); n is 1-N, where N is an integer greater than 1.

[0112] θ1=arctan((Y 心1 -Y 心0 ) / (X 心1 -X 心0 ));

[0113] θ2=arctan((Y 心2 -Y 心1 ) / (X 心2 -X 心1 ));

[0114] θ3=arctan((Y 心3 -Y 心2 ) / (X 心3 -X 心2 ));

[0115] …

[0116] The previously calculated (X 心n ,Y 心n ) are substituted into the above formulas in turn to obtain θ1, θ2, ... n , n is 1-N, and N is an integer greater than 1.

[0117] Finally, the coordinates of the tangent points between the second bearing of the feedback unit and the feedback linear plate (X 切 ,Y 切 ):

[0118] X 切1 =X 心1 +R*sinθ1;

[0119] Y 切1 =Y 心1 -R*cosθ1;

[0120] X 切2 =X 心2 +R*sinθ2;

[0121] Y 切2 =Y 心2 -R*cosθ2.

[0122] …

[0123] After the coordinate values ​​of all the tangent points are calculated in this way, the corresponding feedback curves can be drawn based on the coordinate values ​​of these tangent points.

[0124] According to the feedback curve, the final feedback linear board structure can be made. Figure 6 shown.

[0125] The number of tangent points between the second bearing of the feedback unit and the feedback linear plate can be determined by the cylinder stroke.

[0126] Signal: Set the entire signal range to 0-100%, and all points correspond to the displacement of the cylinder according to the signal percentage. For the positioner input signal of 4-20mA, the signal 4mA is 0, 12mA is 50%, and so on, when 20mA is 100%.

[0127] Stroke: The input signal increases the corresponding cylinder displacement, which is associated with the X0 coordinate value. When the 4mA signal is 0, it corresponds to the initial position of the cylinder, that is, 0 stroke, and when the 24mA signal is 100%, it corresponds to the full stroke of the cylinder.

[0128] Angle φ: The rotation angle of the second feedback axis of the positioner, corresponding to the displacement of the cylinder.

[0129] For example: cylinder stroke 200mm (set 200 points), L = 30mm, R = 6.5mm.

[0130] The travel range of the feedback shaft rotation angle φ is designed according to the cylinder stroke, for example, the feedback shaft rotation angle φ has a value of 0 to 90°.

[0131] The coordinate values ​​of the tangent points corresponding to each point number are obtained by the above formulas. Some coordinate values ​​are shown in Table 1 below:

[0132] Table 1

[0133]

[0134] Reference Figure 7 As shown, the solid line part is a schematic diagram of the feedback linear plate and the second connecting plate in the first position. When the feedback linear plate moves forward, the feedback unit moves obliquely forward along the feedback curve of the feedback linear plate to the second position (the position shown by the dotted line of the feedback unit and the second connecting plate), from Figure 7 It can be seen from the figure that from the first position to the second position, the position of the feedback unit changes, while the position of the first feedback shaft does not change, and the feedback spring is also stretched.

[0135] An embodiment of the present invention further provides a device, which includes not only a valve but also the pneumatic control device of the aforementioned embodiment; wherein the pneumatic control device is used to manipulate the opening and closing of the valve.

[0136] The pneumatic control device and related equipment provided by the embodiment of the present invention, through a feedback device, a feedback linear plate and a first connecting plate, etc., the feedback device has a first feedback shaft, and the first feedback shaft is connected to the second feedback shaft of the positioner. When the cylinder piston rod drives the feedback linear plate to move through the first connecting plate, the feedback linear plate can convert its own displacement in the horizontal direction into a rotation angle of the first feedback shaft in the feedback device, and further feed back to the second feedback shaft of the positioner, thereby realizing the linkage and precise position feedback between the cylinder and the positioner, and the connecting part is between the positioner and the cylinder, so that the overall structure is compact and suitable for installation spaces of various sizes.

[0137] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pneumatic control device, comprising: Positioner and cylinder; characterized in that it also includes: a connecting portion; The positioner is connected to the cylinder via a connecting portion; The connecting part includes: a feedback device, a feedback linear plate and a first connecting plate; The mounting column is used to fix the positioner on the feedback device; The feedback device comprises a first feedback shaft, and the positioner connecting shaft connects the first feedback shaft of the feedback device and the second feedback shaft of the positioner, so as to transmit the rotation angle fed back by the feedback device to the second feedback shaft of the positioner; The first connecting plate is used to connect the piston rod of the cylinder and the feedback linear plate, so that the piston rod drives the feedback linear plate to move in the horizontal direction when in a horizontal motion state, and converts its own horizontal displacement into the rotation angle of the first feedback shaft in the feedback device through the feedback linear plate.

2. The pneumatic control device according to claim 1, characterized in that: The feedback device further comprises: A first bearing, a second connecting plate, a feedback spring and a feedback unit; The first bearing is sleeved on the first feedback shaft, and the lower end of the first bearing is rotatably connected to the second connecting plate; The upper end of the feedback unit is connected to the second connecting plate, and the lower end is in contact with one side of the feedback linear plate, so that when the feedback linear plate moves back and forth on a horizontal plane, the feedback unit is driven to move, and then the first bearing is driven to rotate through the second connecting plate.

3. The pneumatic control device according to claim 1, characterized in that: The second connecting plate is triangular in shape, and the upper end of the feedback unit, one end of the feedback spring, and the first bearing and the first feedback shaft sleeved by the first bearing are respectively arranged at corresponding positions of the three corners of the second connecting plate; The center positions of the first bearing and the first feedback shaft do not move on the horizontal plane. When the feedback linear plate moves back and forth in the horizontal direction, the side of the triangle connected by the feedback unit and the feedback spring moves with the center of the first bearing as the center.

4. The pneumatic control device according to claim 3, characterized in that: The feedback device further includes: a spring support; One end of the feedback spring is hung on the second connecting plate, and the other end is hung on the spring support.

5. The pneumatic control device according to claim 3, characterized in that: The feedback unit has a second bearing; the feedback linear plate is an L-shaped plate, and the feedback linear plate includes a horizontal plate and a vertical plate that are vertically connected; The edge of the side of the horizontal plate not connected to the vertical plate is at least partially configured as a feedback curve; The outer wall of the second bearing of the feedback unit abuts against the edge of the side.

6. The pneumatic control device according to claim 5, characterized in that: The feedback curve is generated in the following way: During the movement of the cylinder piston rod, the feedback linear plate moves accordingly, and the second bearing of the feedback unit also moves accordingly. The angle α between the line connecting the axis of the second bearing and the axis of the positioner feedback shaft and the horizontal axis also changes accordingly. The coordinates of the tangent point between the second bearing of the feedback unit and the feedback linear plate (X 切 ,Y 切 ), determine the number of points on the feedback curve by the cylinder stroke, and calculate the coordinate value of each point (X 切 ,Y 切 ), thereby generating the feedback curve; The horizontal axis is the extending direction of the side where the horizontal plate is connected to the vertical plate.

7. The pneumatic control device according to claim 6, characterized in that: The coordinates of the tangent point satisfy the following formula: X 切n =X 心n +R×sinθ n ; AND 切n =And 心n -R×cosθ n ; Like:θ n =arctan(Y 心n -Y 心n-1 ) / (X 心n -X 心n-1 ): X 心n =X 0n -L×cosα n ; Y 心n =Y0-L×sinα n ; Wherein, R is the radius of the second bearing of the feedback unit, which is a constant; L is the distance between the positioner feedback axis and the feedback unit second bearing axis, which is a constant; α is the angle between the line between the positioner feedback axis and the feedback unit axis and the horizontal axis; θ is the rotation angle of the positioner feedback axis; the vertex of the right angle side where the feedback linear plate is connected to the first connecting plate and the horizontal plate is connected to the vertical plate is the origin of the horizontal plane coordinate system; (X 切n ,Y 切n ) are the coordinates of each tangent point between the second bearing of the feedback unit and the feedback linear plate on the horizontal plane in the coordinate system; (X 心n ,Y 心n ) is the coordinate of the center point of the second bearing of the feedback unit in the coordinate system; X 0n ,Y0 is the point coordinate of the feedback axis of the positioner when the feedback linear plate moves. The value of Y0 is fixed. 0n It changes at different positions as the linear plate moves.

8. The pneumatic control device according to claim 7, characterized in that: The number of the tangent points is determined according to the cylinder stroke.

9. The pneumatic control device according to any one of claims 1 to 6, characterized in that: Also includes: A first guide rail, a second guide rail, a protection plate and a mounting plate; the feedback linear plate is arranged between the first guide rail and the second guide rail and is limited in the vertical direction by the first guide rail and the second guide rail, so that the feedback linear plate can move in the horizontal direction; The protection plate is arranged above the first guide rail and is fixedly connected to the first guide rail; the mounting plate is arranged below the second guide rail and is fixedly connected to the second guide rail.

10. A device comprising a valve, characterized in that: Also includes a pneumatic control device as described in any one of claims 1 to 9; The pneumatic control device is used to control the opening and closing of the valve.

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