Anti-falling position feedback connecting rod of automatic control valve positioner

Abstract

The utility model discloses an anti-falling position feedback connecting rod of an automatic control valve positioner, which comprises a connecting rod body, one end of the connecting rod body is fixed on a valve rod of an automatic control valve in a using state, and the other end of the connecting rod body penetrates through a feedback chute on a position feedback rod on the automatic control valve positioner. A limiting piece is fixed to the end, away from the valve rod, of the connecting rod body and used for preventing a position feedback rod of the automatic control valve positioner from falling off from the connecting rod body. When the automatic control valve is used, if the position of the position feedback rod changes in the length direction of the connecting rod body, the position feedback rod is limited by the limiting piece, so that the position feedback rod cannot fall off from the connecting rod body, the feedback function of the position feedback rod is kept, and it is ensured that the self-adjusting function of the automatic control valve cannot be lost due to falling of the position feedback rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of anti-falling automatic control valve positioner position feedback connecting rod, belong to automatic control valve field. BACKGROUND

[0002] The application of valve in industrial production is extensive, mainly used for the adjustment of parameters such as flow, pressure, temperature and liquid level of materials, and the automatic control valve realizes the automatic control of process parameters, reduces human intervention and greatly reduces labor intensity. As an important part of regulating valve, the automatic control valve positioner position feedback connecting rod plays a crucial role in the automatic adjustment process of valve. The feedback connecting rod plays a negative feedback role when the regulating valve is in working state. When the feedback rod falls off, the negative feedback function is lost, and the movement of the valve stem cannot feedback the positioner position feedback signal. The output signal of the positioner is always maximum or minimum, and at this time the valve will be in full open or full closed position. In actual production, the automatic control valve positioner position feedback connecting rod is affected by the external environment, and the connecting rod and the position feedback slot fall off from time to time. After the self-adjusting function of the valve is lost, the material flow is not controlled, causing production fluctuation or device shutdown, and even causing fire and explosion accidents. SUMMARY

[0003] The utility model aims at providing a kind of anti-falling automatic control valve positioner position feedback connecting rod, solve the technical defects that the position feedback rod of automatic control valve positioner in prior art is easy to fall off, so that the self-adjusting function of automatic control valve is lost.

[0004] To solve the above problems, the technical scheme adopted by the utility model is as follows: an anti-falling automatic control valve positioner position feedback connecting rod, including connecting rod body, one end of the connecting rod body is fixed on the valve stem of the automatic control valve in use state, the other end of the connecting rod body passes through the feedback slot on the position feedback rod of the automatic control valve positioner, a limiting piece is fixed on the end of the connecting rod body away from the valve stem, for preventing the position feedback rod of the automatic control valve positioner from falling off the connecting rod body. The utility model sets limiting piece on the connecting rod body, when the position feedback rod changes position along the length direction of the connecting rod body, the limiting piece limits the position feedback rod, so that the position feedback rod does not fall off the connecting rod body, thereby maintaining the feedback function of the position feedback rod and ensuring that the self-adjusting function of the automatic control valve is not lost due to the falling off of the position feedback rod.

[0005] As a further improvement of the utility model, the first screw thread is arranged on one end of the connecting rod body fixed with the valve rod, and at least two first nuts are arranged on the first screw thread and threadedly matched with the first screw thread, in the use state, the connecting rod body passes through the valve rod, and the first nuts are respectively located on two sides of the valve rod and used for clamping the connecting rod body on the valve rod.

[0006] As a further improvement of the utility model, the second screw thread is arranged on the other end of the connecting rod body away from the valve rod, the limiting piece is a second nut, the second nut is arranged on the part of the connecting rod body where the second screw thread is arranged and is threadedly matched with the connecting rod body.

[0007] As a further improvement of the utility model, the diameter of the connecting rod body is smaller than the width of the feedback sliding groove, and the width of the second nut is greater than the width of the feedback sliding groove.

[0008] As a further improvement of the utility model, the position feedback rod of the automatic control valve positioner is not in contact with the limiting piece.

[0009] As a further improvement of the utility model, a 10mm gap is left between the position feedback rod of the automatic control valve positioner and the limiting piece.

[0010] As a further improvement of the utility model, the fixing rod is further arranged, one end of the fixing rod is fixed on the valve rod, the other end of the fixing rod is arranged in the direction away from the automatic control valve positioner, and one end of the connecting rod body is fixed with the other end of the fixing rod.

[0011] As a further improvement of the utility model, the fixing through groove is arranged at one end of the fixing rod for being connected with the connecting rod body, the connecting rod body passes through the fixing through groove and is fixed with the fixing rod.

[0012] As further improvement of the utility model, the fixed groove is a long circular groove, and at least one first nut is arranged on each side of the long circular groove for clamping the connecting rod body on the fixed rod.

[0013] As further improvement of the utility model, a fixed block is arranged on the valve rod, and one end of the fixed rod is detachably installed on the fixed block.

[0014] In summary, the utility model has the advantages that: when the position feedback rod is moved along the length direction of the connecting rod body, the position feedback rod is limited by the limiting piece, so that the position feedback rod cannot fall off the connecting rod body, the feedback function of the position feedback rod is maintained, and the self-adjusting function of the automatic control valve is ensured not to be lost due to the falling off of the position feedback rod. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the three-dimensional structure of the utility model.

[0016] Figure 2 is a schematic diagram of the three-dimensional structure of the utility model from another angle.

[0017] Figure 3 is Figure 2 a partial enlarged view of position A.

[0018] Wherein: 1, connecting rod body;2, valve rod;3, automatic control valve positioner;4, position feedback rod;5, feedback sliding groove;6, first thread;7, first nut;8, second thread;9, second nut;10, fixed rod;11, fixed groove;12, fixed block. DETAILED DESCRIPTION

[0019] The specific embodiments of the utility model will be further described below with reference to the drawings.

[0020] As Figures 1 to 3 shown in the anti-falling automatic control valve positioner position feedback connecting rod, including connecting rod body 1, the connecting rod body 1 is bar-shaped, one end of the connecting rod body 1 is fixed on the valve rod 2 of the automatic control valve in the use state, the other end of the connecting rod body 1 passes through the feedback sliding groove 5 on the position feedback rod 4 on the automatic control valve positioner 3, the feedback sliding groove 5 is long circular, a limiting piece is fixed on the end of the connecting rod body 1 away from the valve rod 2, which is used for preventing the position feedback rod 4 of the automatic control valve positioner 3 from falling off the connecting rod body 1 in the use state, ensuring that the connecting rod body 1 always supports the position feedback rod 4 of the automatic control valve positioner 3.

[0021] AsFigures 1 to 3 As shown, the connecting rod body 1 of this invention has a first thread 6 on one end for fixing to the valve stem 2, and at least two first nuts 7 that thread-mate with the first thread 6 are provided on the first thread 6. Optimally, this invention sets the number of first nuts 7 to two. In use, the connecting rod body 1 passes through the valve stem 2, and the two first nuts 7 are located on opposite sides of the valve stem 2. The two first nuts 7 move in opposite directions to clamp the valve stem 2, thus fixing the connecting rod body 1 to the valve stem 2. This invention also has a second thread 8 on the end of the connecting rod body 1 away from the valve stem 2. A second nut 9 is used as a limiting element, located on the part of the connecting rod body 1 where the second thread 8 is provided, and thread-mates with the connecting rod body 1. The diameter of the connecting rod body 1 is smaller than the width of the feedback groove 5, and the width of the second nut 9 is larger than the width of the feedback groove 5. When the position of the position feedback rod 4 changes, the first nut 9 prevents it from moving along the length of the connecting rod body 1, thus preventing the position feedback rod 4 from detaching from the end of the connecting rod body 1.

[0022] like Figures 1 to 3 As shown, the position feedback rod 4 of the automatic control valve positioner 3 in this utility model does not contact the limiting component. In the optimal way, a 10mm gap is left between the position feedback rod 4 and the limiting component of the automatic control valve positioner 3, so as to achieve that the second nut 9 does not contact the position feedback rod 4, and prevent the second nut 9 from blocking the position feedback rod 4 from moving in the radial direction of the connecting rod body 1 relative to the connecting rod body 1 when the valve rod 2 moves.

[0023] like Figures 1 to 3 As shown, in order to improve the feedback sensitivity of this utility model, a fixing rod 10 is provided. One end of the fixing rod 10 is fixed to the valve stem 2, and the other end of the fixing rod 10 is set in a direction away from the automatic control valve positioner 3. One end of the connecting rod body 1 is fixed to the end of the fixing rod 10 away from the valve stem 2. This invention features a fixed through groove 11 extending through both sides of a fixed rod 10 at one end for connection to the connecting rod body 1. The connecting rod body 1 passes through the fixed through groove 11 and is fixed to the fixed rod 10. The fixed through groove 11 is an elongated oval groove, with a first nut 7 on each side for clamping the connecting rod body 1 onto the fixed rod 10, thus fixing the connecting rod body 1 to the fixed rod 10. Because of the fixed rod 10, the distance between the connecting rod body 1 and the automatic control valve positioner 3 is increased. Thus, when the valve stem 2 moves a small distance, the connecting rod body 1 can make the position feedback rod 4 swing at a larger angle, making it easier for the automatic control valve positioner 3 to detect the movement of the valve stem 2 and improving the feedback sensitivity of this invention.

[0024] like Figure 1 and Figure 2As shown, the utility model discloses a fixed block 12 on the valve stem 2, one end of fixed rod 10 and fixed block 12 adopt at least two bolts detachably install, and this bolt passes through fixed rod 10 and with fixed block 12 screw thread cooperation, the fixed rod 10 in the utility model is rectangular plate shape, to facilitate its installation.

[0025] The parts not particularly mentioned in the above description are all prior art or can be realized by prior art. Moreover, the specific implementation cases described in the utility model are only preferred implementation cases of the utility model and are not used to limit the implementation scope of the utility model. That is, equivalent changes and modifications made according to the content of the utility model patent scope should be regarded as the technical scope of the utility model.

Claims

1. A fall-prevention automatic control valve positioner position feedback linkage, characterized by: The connecting rod body is fixed on the valve stem of the automatic control valve at one end in use, and the other end of the connecting rod body passes through the feedback slot on the position feedback rod of the automatic control valve positioner, a limiting piece is fixed on the end of the connecting rod body away from the valve stem, for preventing the position feedback rod of the automatic control valve positioner from falling off the connecting rod body. The end of the connecting rod body for fixing with the valve stem is provided with a first thread, and at least two first nuts are arranged on the first thread in threaded cooperation, in use, the connecting rod body passes through the valve stem, and the first nuts are respectively located on both sides of the valve stem, for clamping the connecting rod body on the valve stem.

2. The anti-drop, automatically controlled valve positioner position feedback linkage of claim 1, wherein: The end of the connecting rod body away from the valve stem is provided with a second thread, and the limiting piece is a second nut, which is located at the position of the connecting rod body provided with the second thread and is in threaded cooperation with the connecting rod body.

3. The anti-backout, automatically controlled valve positioner position feedback linkage of claim 2, wherein: The diameter of the connecting rod body is smaller than the width of the feedback slot, and the width of the second nut is greater than the width of the feedback slot.

4. The anti-backout, automatically controlled valve positioner position feedback linkage of claim 1, wherein: The position feedback rod of the automatic control valve positioner is not in contact with the limiting piece.

5. The anti-backout, automatically controlled valve positioner position feedback linkage of claim 4, wherein: The position feedback rod of the automatic control valve positioner and the limiting piece leave a gap of 10mm.

6. The anti-backout, automatically controlled valve positioner position feedback linkage of claim 1, wherein: It also includes a fixed rod, one end of which is fixed on the valve stem, the other end of the fixed rod is arranged away from the automatic control valve positioner, and one end of the connecting rod body is fixed with the other end of the fixed rod.

7. The anti-backout, automatically controlled valve positioner position feedback linkage of claim 6, wherein: A fixed slot is formed on the end of the fixed rod for connecting with the connecting rod body, the connecting rod body passes through the fixed slot and is fixed with the fixed rod.

8. The anti-backout, automatically controlled valve positioner position feedback linkage of claim 7, wherein: The fixed slot is an oblong slot, and at least one first nut is arranged on each side of the oblong slot, for clamping the connecting rod body on the fixed rod.

9. The anti-backout, automatically controlled valve positioner position feedback linkage of claim 6, wherein: A fixed block is fixed on the valve stem, and one end of the fixed rod is detachably mounted with the fixed block.

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